JPH1024337A - Heat transfer tube for heat exchanger, method for manufacturing heat transfer tube, and apparatus for manufacturing heat transfer tube - Google Patents

Abstract

(57) [Problem] To provide a method of manufacturing a heat transfer tube that is inexpensive and can be optimally designed according to various needs without requiring a large and extremely expensive press machine or a mold. SOLUTION: A cylindrical workpiece material 24 made of a thin metal is set in a female die 31 having a plurality of concave portions 32 on an outer peripheral surface of a shaft 63, and one pin guide member 85 provided on a pin guide member 85 facing the female die. One or more molding pins 35 are inserted into the guide holes 34 described above. The workpiece 24 is selectively moved in the axial direction, non-moved, rotated, and non-rotated in accordance with the pattern to be formed, and can be moved in the radial direction to support the roller 89 that abuts on the cam 101. By rotating the roller support ring 88, the molding pin 35 is continuously advanced and retracted. The material to be processed is plastically deformed by the tapping operation of the molding pin, thereby forming a large number of continuous or intermittent uneven strips which are perpendicular, parallel, inclined, or zigzag with respect to the axial direction.
By rotating the pin guide member 85 and sequentially shifting the positions of the molding pins 35, a required number of uneven strips can be formed with a small number of molding pins.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer tube for a heat exchanger, a method for manufacturing the heat transfer tube, and an apparatus for manufacturing the heat transfer tube.

[0002]

2. Description of the Related Art FIGS. 7 to 9 show uneven patterns of a heat transfer plate generally used in the prior art. A plurality of heat transfer plates having these patterns are stacked, and the periphery thereof is sealed with packing. Construct a decomposable heat exchanger. Distribution surfaces for introducing and discharging the heat medium are provided on both sides of the heat transfer surface of the concavo-convex pattern. The different heat mediums introduced are flowed through the alternate gaps of the heat transfer plates, and exchange heat.

The heat transfer plate shown in FIG. 7 is a so-called dimple pattern in which a number of depressions or projections are regularly arranged. FIG. 8 shows that a number of parallel triangular waves are formed in a direction perpendicular to the flow direction of the heat medium. 9 has a so-called herringbone pattern in which a number of irregularities are formed obliquely to the flow direction of the heat medium, and the opposing convex portions of the heat transfer plate surface cross each other and come into contact with each other. ing.

[0004] This type of heat transfer plate is, as shown in FIG.
The periphery of the cut rectangular material 1 is strongly clamped, and the unevenness of the heat transfer surface portion 2 is formed by plastic working of press molding using a male mold and a female mold. In addition, blanking of the outer periphery 3 and the distribution surface portion 4 is performed by using another mold.

[0005] The main factors of the heat exchanger design specifications include the width and length of the heat transfer plate, the shape of the waveform, the pitch, the inclination angle, the heat transfer area, etc., and it is optimal if these factors can be arbitrarily selected. Design becomes possible. However, in the press molding method, there is no flexibility other than selecting the type of press die prepared in advance, so the heat exchanger specifications are determined by increasing or decreasing the number of stacked heat transfer plates. There is a problem that parts occur.

In the pattern of FIG. 9, when the directions of the waveforms of the opposed heat transfer plates are different from each other by 180 degrees, the flow paths of the heat medium intersect with each other to generate a turbulent flow, thereby improving the heat transfer performance. . In this case, two types of heat transfer plates having different patterns are required. However, as shown in FIG. 11, the mold of the heat transfer surface portion shown in FIG. A method for producing two types of heat transfer plates (b) and (c) using a mold has been proposed (see JP-A-1-244289). If you do this,
Die cost can be saved.

When the length of the heat transfer surface is to be changed,
As shown in FIG. 12, the molds of the heat transfer plate and the distribution surface of the heat transfer plate can be divided freely, and the molds are rearranged by preparing several types of molds having different lengths L of the heat transfer surface. There is also a proposal to obtain a desired length of heat transfer plate
(See JP-A-56-151898).

Further, the optimum inclination angle θ of the waveform of the heat transfer surface portion is selected in accordance with the physical properties of the heat medium and the operating conditions. Heat transfer plates having large, medium and small inclination angles are prepared, and these are used. A method of facing them in an appropriate combination has also been implemented.

[0009]

However, the above-mentioned conventional manufacturing method has the following problems. (1) Each of them is press forming, and a very large amount of plastic working is required to form a large number of uneven strips on the heat transfer surface at a time with this press. Therefore, a hydraulic press having a pressing capacity (for example, a pressing pressure of tens of thousands of tons) necessary for forming the largest heat transfer plate to be manufactured is required, so that the equipment cost is extremely high, and the press working speed is extremely high. Slow to.

(2) As described above, when pressurizing with a pressing pressure of tens of thousands of tons, a high-rigidity and expensive die that does not deform the die due to the pressure must be prepared.
In order to perform optimal design in response to various needs, a large number of molds must be prepared according to the type of heat transfer plate.

(3) Even if the periphery of the material is strongly clamped at the time of pressing, the material slides around the mold and the center of the material is pulled, so that a difference occurs in the drawing depth.
If there is a difference between the drawing depths of the heat transfer plates, in a heat exchanger in which a large number of heat transfer plates are stacked, a gap is generated, and the flow of the heat medium becomes uneven, thereby deteriorating the heat transfer performance. For this reason, the male mold and the female mold provide dimensional accuracy with the bottom butts between the molding materials.
Further press force is required.

The present invention solves such a conventional problem, and does not require a large and very expensive press machine or a metal mold, is inexpensive, and has an optimal design according to various needs. It is an object of the present invention to provide a heat transfer tube manufacturing method and a heat transfer tube manufacturing apparatus that are possible, and to provide a heat transfer tube of a heat exchanger manufactured thereby.

[0013]

In order to achieve this object, a method of manufacturing a heat transfer tube according to the present invention comprises a plurality of recesses arranged on a circumference and having a substantially U-shaped cross section perpendicular to an axis. A cylindrical workpiece made of a thin metal set in a female mold is selectively combined with axial movement, non-movement, one-way rotation, non-rotation, and forward / reverse rotation according to the pattern to be molded. At the same time, the workpiece is plastically deformed by continuously tapping with a plurality of punch-shaped male molds respectively facing the female mold, and a large number of continuous or intermittent in a perpendicular, parallel or inclined, or zigzag shape with respect to the axial direction. After forming the concave and convex strips, the cylindrical workpiece is worked flat.

According to this manufacturing method, the cylindrical workpiece set in the female mold can be selected from axially moving, non-moving, one-way rotating, non-rotating, and forward / reverse rotating in accordance with the pattern to be formed. Since it is continuously plastically deformed by continuously tapping with a plurality of punch-shaped male molds while performing appropriate combination, a large number of continuous or intermittent uneven strips perpendicular, parallel or inclined to the axial direction, or zigzag shape By appropriately adjusting the rotation angle and the movement pitch of the material to be processed, the inclination angle of the formed ridges with respect to the axial direction can be arbitrarily selected.

Further, the apparatus for manufacturing a heat transfer tube according to the present invention is characterized in that an outer peripheral surface of a fixed shaft or an end portion of a rotatable shaft, or an inner peripheral surface of a fixed ring-shaped member, is perpendicular to the shaft. A female die having at least one concave portion having a substantially U-shaped cross section at a predetermined interval in a circumferential direction; and a pin guide having at least one radial guide hole facing the female die via a predetermined gap. A member, one or more molding pins as male molds each having a tip suitable for the shape to be molded such as a semi-cylindrical or hemispherical shape, which are inserted through the guide holes, and contact with the rear end of the molding pin to rotate. Cam means for continuously moving the molding pin forward and backward by moving the cylindrical workpiece made of thin metal inserted between the female mold and the pin guide member in the axial direction, and in the forward direction and Material moving means for rotating in the opposite direction And it formed.

In this configuration, the cylindrical workpiece is axially moved, non-moved, unidirectionally rotated, non-rotated and forward / reversely rotated at the timing when the molding pin is retracted in accordance with the pattern to be molded. In addition to performing appropriate combination, the cylindrical workpiece is plastically deformed by continuous tapping operation of the molding pin, so that a large number of continuous or intermittent perpendicular, parallel or inclined, or zigzag shapes are formed with respect to the axial direction. Ridges can be formed.

A roller supporting ring rotatably provided to support at least one radially displaceable roller which is disposed so as to be able to abut on the rear end of the molding pin; A material having a concave portion which is rotatably disposed in contact with the roller on the outer periphery of the ring and has a concave portion into which a part of the roller selected by the relative position to the roller support ring is fitted. By controlling the timing of the movement and rotation of the cam and the rotation of the cam, a part of the roller is fitted into the concave portion of the cam, and the beating operation of the molding pin, whose rear end abuts on the roller, against the material to be processed can be avoided. Accordingly, when processed into a flat shape, the concave and convex strips can be formed by leaving a portion corresponding to both edges parallel to the axis or a portion corresponding to a partition dividing the heat medium passage.

Further, the pin guide member is rotatable around the female die, the pin guide member is rotated in synchronization with the rotation of the female die, and the position of the molding pin is sequentially shifted to plastically deform the cylindrical workpiece. If deformed, a continuous or intermittent uneven strip can be formed without providing a large number of guide holes and molding pins.

According to the heat transfer tube manufacturing apparatus described above, a large number of very expensive press machines and a large number of expensive dies are not required as in the prior art, and a few male and female dies can be prepared. If
It is possible to easily respond to various needs such as the size of the waveform, the inclination angle with respect to the axial direction, the pitch, and the length L of the heat transfer surface.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. (Embodiment 1) FIG. 1 shows a schematic configuration of a heat transfer tube manufacturing apparatus according to Embodiment 1 of the present invention. FIG.
, 11 is a base frame, 12 is a first fixed frame erected on the base frame 11, 13 is a second fixed frame also erected on the base frame 11, and 14 is a guide rail provided on the base frame 11. It is a movable frame that can move along 15. The movable frame 14 is provided with a ball spline 16, and a ball screw 17 meshes with the ball spline 16. Both ends of the ball screw 17 are supported by the support frame 18 and the gear pair 19
, And is driven by the frame motor 20.

Reference numeral 21 denotes a material chuck, the shaft of which is rotatably supported by the movable frame 14, and a material rotating gear pair.
The rotation is driven by a material rotation motor 23 attached to the movable frame 14 via the rotation frame 22. Reference numeral 24 denotes a cylindrical work material made of a thin metal having one end engaged with the material chuck 21 and is formed by a forming portion indicated by A described later in detail while moving in the direction of arrow B. Reference numeral 25 denotes a shaft having one end fixed to the first fixed frame 12, and a female die is provided at the tip thereof. Reference numeral 26 denotes a cam drive motor for rotating a cam for driving a molding pin as a male die via a gear 27 in the molding section A.

FIG. 2 shows a detailed configuration of the molding portion A, and FIG. 3 shows a cross section taken along line XX of FIG. Figure 2
In FIG. 3, reference numeral 31 denotes an axis extending from the first fixed frame 12.
25 is a female mold formed on the outer peripheral surface of the tip. This female mold
Reference numeral 31 denotes a recess 32 having a substantially U-shaped cross section perpendicular to the shaft 25, and a plurality of the recesses 31 are provided at regular intervals in the circumferential direction of the shaft. Reference numeral 33 denotes a fixed guide fixed to the second fixed frame 13 so as to face the female mold 31 with a predetermined gap therebetween, and having a plurality of radial guide holes 34 corresponding to the concave portions 32. A molding pin 35 as a male die having a tip suitable for a molding shape such as a semi-cylindrical shape or a hemispherical shape is inserted into each of the guide holes 34.

At the time of molding, a cylindrical workpiece 24 made of a thin metal is inserted between the female mold 31 and the tip of the molding pin 35. A spring 36 is provided around the vicinity of the tip of the molding pin 35 to urge the molding pin 35 to always retreat, and is provided between the female mold 31 and the tip of the molding pin 35. This is because a gap is formed so that the cylindrical workpiece 24 can be easily inserted when the cylindrical workpiece 24 is inserted into the cylindrical workpiece 24. 36 is not required. Reference numeral 37 denotes a wear-resistant ball or roller provided rotatably at the rear end of the molding pin 35.

Reference numeral 38 denotes a first cam which contacts the ball 37 at the rear end of the molding pin 35 and rotates the molding pin 35 continuously by rotating. The first cam 38 has its side surface fixed to the gear 39 by screws. Also, the first
The outer periphery of the cam 38 is rotatably guided by a cam guide member 41 fixed to a frame. Then, when the cam drive motor 26 rotates, the gear 39 rotates via the gear 27, and the first cam 38 rotates accordingly.

Reference numeral 43 denotes movable teeth provided on a part of the first cam 38. Reference numeral 44 denotes a second cam for supporting the rear end of the movable tooth 43, which is locked to the cam guide member 41 by a screw 40. When the screw 40 is removed, the second cam 44 is slidable in the axial direction, and it is possible to adjust whether or not the portion supporting the rear end of the movable tooth 43 is a concave portion.

The second cam 44 is formed as a concave portion, and when the movable tooth 43 comes to the position of the concave portion, the movable tooth 43 retreats. Therefore, the rear end of the molding pin 35 at that portion is not pushed, so that the hitting operation on the workpiece 24 is avoided. In this case, a part of the uneven strip is not plastically deformed.

Next, a method of manufacturing the heat transfer tube according to the first embodiment will be described. One end of a cylindrical workpiece 24 made of a thin metal is engaged with the material chuck 21, and the other end is inserted between the shaft 25 and the fixed guide 33. The second fixed frame
The part of 13 is also inserted. Movable frame 14 with frame motor
The molding is started by approaching the vicinity of the molding part A by 20.

First, the cam drive motor 26 is rotated, and the gear
Rotate cam 38 via 27 and 39. Molding pin 35
The trailing edge of the cam 38 moves from the valley to the hill, and from the hill to the valley.
, The material to be processed 24 is pushed into the female concave portion 32 and undergoes plastic deformation. When the rear end of the molding pin 35 moves to the valley of the cam 38, it retreats and separates from the female mold.At that timing, the movable frame 14 is moved (forwarded) by the frame motor 20 by a predetermined distance in the direction of arrow B, Further, the material rotating motor 23 rotates the material chuck 21 by a predetermined angle to shift the molding position.

In this manner, a number of continuous or intermittent irregularities, that is, so-called herringbone patterns, which are inclined with respect to the axial direction, are formed by the rotation and feeding of the workpiece 24 and the continuous tapping operation by the molding pins 35. can do.

In the above operation, a typical case in which the rotation and the feeding of the workpiece 24 are simultaneously performed has been described. However, if the rotation of the workpiece 24 is not performed and only the rotation is performed, a concave portion perpendicular to the axis may be formed. If it is possible to feed only in the axial direction without rotation, it becomes an uneven strip parallel to the axis. Furthermore, if the feed pitch is increased with respect to the timing of the hitting operation, a so-called dimple pattern in which the dents are arranged at regular intervals as shown in FIG. If the interval between them is reduced and continuous, a series of grooves is formed.

Thereafter, the cylinder having the concave and convex strips is cut out and processed into a flat shape as shown in FIG. 13 (b), whereby a heat transfer tube having no side seams can be obtained. In these heat transfer tubes, the inner convex portions of the flat plate portions facing each other contact in a linear or crossing manner. Further, distribution surfaces are formed on both sides of the heat transfer surface in a separate process.

FIG. 14 shows a case where a large number of uneven strips inclined with respect to the axial direction are formed into a flat shape. The inclination angle θ can be arbitrarily selected by appropriately adjusting the feed and rotation of the material. Further, the pitch P between waveforms can be doubled, for example, by thinning out every other molding pin 35.

In the case of flat processing, by cutting along both side edges, it is possible to easily form individual heat transfer plates of a type in which a plurality of heat transfer plates are sealed and the periphery thereof is sealed with packing as in the related art.

According to the heat transfer tube manufacturing apparatus of the first embodiment configured as described above, since the forming is performed sequentially by continuous punching operation of the punch, the manufacturing apparatus itself does not become large and the press pressure is reduced. Small enough. Also, no expensive mold is required. In addition, whether there is rotation or not,
Depending on the speed, perpendicular or parallel to the axial direction or parallel or inclined ridges can be formed, and the pitch and inclination angle of the ridges can be freely selected,
The length L of the heat transfer surface can also be set arbitrarily.

(Embodiment 2) FIG. 4 shows a schematic configuration of a heat transfer tube manufacturing apparatus according to Embodiment 2 of the present invention. In the first embodiment, an example is shown in which the female mold is arranged on the center side and the male mold is arranged on the outer peripheral portion. However, this is suitable when the pipe diameter is relatively small. In the second embodiment, an example is shown in which a female mold is arranged on the outside and a male mold is arranged to face the inner peripheral surface. This is suitable when the pipe diameter is relatively large.
The same components as those in FIG. 1 are denoted by the same reference numerals.

In FIG. 4, reference numeral 45 denotes a first fixed frame;
46 is a second fixed frame, and 47 is a third fixed frame. Reference numeral 48 denotes a ring-shaped member fixed to the first fixed frame 45, and has a female mold on the inner peripheral surface thereof as described below.

FIG. 5 shows the molding part C in detail.
FIG. 6 shows a YY cross section of FIG. Ring-shaped member 48
As shown in FIG. 6, a female mold 50 having a plurality of concave portions 49 having a substantially U-shaped cross section perpendicular to the axis is provided at regular intervals in the circumferential direction. Reference numeral 51 denotes a hollow fixed guide extending from the second fixed frame 46 and facing the female mold 50 with a predetermined gap therebetween, and a plurality of radial guide holes 52 corresponding to the concave portions 49 of the female mold 50. Having. In the guide hole 52,
A molding pin 53 as a male die having a tip suitable for the shape to be molded such as a semi-cylindrical or hemispherical shape is inserted therethrough. As in the case of the first embodiment, the cylindrical workpiece 24 made of a thin metal is inserted between the female mold 50 and the fixed guide 51.

Numeral 54 denotes a first cam which comes into contact with the rear end of the molding pin 53 and continuously advances and retreats by rotating the molding pin 53. The first cam 54 includes a cam shown in FIG. The rotation of the drive motor 55 is transmitted via a gear pair 56. In addition,
A wear-resistant roller is provided between the first cam 54 and the molding pin 53.
57 are located.

Reference numeral 58 denotes movable teeth provided on a part of the first cam 54. Reference numeral 59 denotes a second cam that supports the rear end of the movable tooth 58, and is locked by a key 61 to a support shaft 60 extending from the third fixed frame 47. When the key 61 is removed, the second cam 59 is slidable in the axial direction, and it is possible to adjust whether or not the portion supporting the rear end of the movable tooth 58 is a concave portion.

The second cam 59 is formed as a concave portion, and when the movable tooth 58 comes to the position of the concave portion, the movable tooth 58 retreats. Therefore, since the rear end of the molding pin 53 at that portion is not pushed, a hitting operation on the workpiece 24 is avoided. In this case, a part of the uneven strip is not plastically worked.

Next, a method of manufacturing the heat transfer tube according to the second embodiment will be described. One end of a cylindrical workpiece 24 made of a thin metal is engaged with the material chuck 21, and the other end is inserted between the ring-shaped member 48 and the fixed guide 51. The first fixed frame 45 is also inserted. The movable frame 14 is brought close to the vicinity of the forming portion C by the frame motor 20 to start forming.

First, the cam drive motor 55 is rotated, and the cam 54 is rotated via the gear pair 56. Since the rear end of the molding pin 53 moves from the valley to the valley of the cam 54 (including the roller 57) from the valley to the valley, and the tip of the molding pin 53 hits the workpiece 24 when riding on the hill, The work material 24 is pushed into the female concave portion 49 and undergoes plastic deformation. The rear end of the molding pin 53 is cam
When moving to the valley of 54, the female mold retreats and leaves, so at that timing, the movable frame is
14 is moved by a predetermined distance in the direction of arrow B, and the material chuck 21 is rotated by a predetermined angle by the material rotation motor 23 to shift the molding position.

In this manner, by moving and rotating the workpiece 24 and continuously hitting it with the molding pins 53, a large number of continuous irregularities parallel or inclined with respect to the axial direction can be formed. Thereafter, the cylinder having the uneven stripes is cut out and processed into a flat shape to obtain a heat transfer tube having no side seams, as in the first embodiment.

In the first and second embodiments and the claims, the female recess has a substantially U-shaped cross section. However, the female recess has a V-shape, a stepped recess, or any other shape having the same function and effect. If there is, it belongs to the technical scope of the present invention. Similarly, other members can be changed without departing from the spirit of the present invention.

Further, in Embodiments 1 and 2, a female die is used. However, even if there is no female die, a plurality of punch-like male dies can be used to continuously deform and plastically deform the material to be processed.
A large number of continuous or intermittent irregularities parallel or inclined to the axial direction can be formed. This will be described later in detail.

(Embodiment 3) FIG. 16 shows a schematic configuration of a heat transfer tube manufacturing apparatus according to Embodiment 3 of the present invention, which is a further improvement of the manufacturing apparatus in Embodiment 1. . 16, the same components as those in FIG. 1 are denoted by the same reference numerals. Reference numeral 63 denotes a shaft which expands and contracts by a predetermined distance by a driving means 64 fixed to the first fixed frame 12, and a female mold is provided at a tip end thereof.

Reference numeral 65 denotes a material feeder for extruding the cylindrical work material 24 made of a thin metal set on the shaft 63 in the direction of arrow B. In Embodiments 1 and 2, one end of the material to be processed is pulled by holding it with a material chuck. However, in the pulling method, it is conceivable that strain is applied to the formed concavo-convex strip and deformed, thereby lowering the processing accuracy. Therefore, in the third embodiment, a method of extruding an unprocessed portion with a roller is employed.

The material feeding device 65 includes a material rotating motor 23 fixed to a movable frame 67 movable in the axial direction by an air cylinder 66, a material rotating member 69 having a gear 68 meshing with a motor gear, and a material rotating member 69. A material gripping member 70 slidably connected to 69 is provided. The material gripping member 70 is
By meshing with the worm gear 71 provided on the side surface of the material rotating member 69 and rotating the worm gear 71, the material rotating member
The outer periphery of the workpiece 24 is gripped with a suitable pressure by a plurality of feed rollers 72 having an elastic tire on the outer periphery while sliding in the radial direction along the side surface of 69.

Reference numeral 73 denotes a motor having a speed reducer, preferably a stepping motor, which rotates the feed roller 72 to move the workpiece 24 in the direction of arrow B. Stepping motor
The control voltage of 73 is supplied from a ring-shaped terminal 75 on a terminal plate 74 attached to one end of the material rotating member 69 via a lead wire (not shown). A brush 76 extending from the movable frame 67 comes into sliding contact with the ring-shaped terminal 75.

The material feeder 65 having the above structure rotates the material rotating member 69 via the gear 68 meshing with the motor gear by the rotation of the material rotating motor 23, while the movable frame 6 rotates.
7, a stepping motor 73 by a control voltage supplied through a brush 76, a ring-shaped terminal 75, and a lead wire (not shown).
Is rotated, whereby the feed roller 72 for gripping the workpiece 24 rotates, so that the workpiece 24 receives the rotational force and the driving force for feeding in the B direction.

Reference numeral 26 denotes a bevel gear 27a, 2
A cam drive motor 78 that rotates a cam for driving a molding pin as a male die through 7b, as described in detail below, rotates a flywheel 92 via a pulley 79 and a belt 80, Via a clutch, a flywheel drive motor that rotates a roller support ring that supports a roller disposed between the cam and the molding pin, 81, via a gear 82,
It is a pin guide drive motor that rotates a pin guide member that guides a molding pin.

FIG. 17 shows a detailed configuration of the molded portion D, and FIG. 18 shows a cross section taken along line ZZ of FIG. Figure 17,
In FIG. 18, reference numeral 31 denotes an axis extending from the first fixed frame 12.
63 is a female mold formed on the outer peripheral surface of the tip. This female mold
31 is a concave portion 32 having a substantially U-shaped cross section perpendicular to the shaft 63.
(Refer to FIG. 3), and a plurality of them are provided at regular intervals in the circumferential direction of the shaft as in the first embodiment.

Reference numeral 85 denotes a pin guide member, which is a female recess 32.
A plurality of guide holes 34 in the radial direction corresponding to each other, and each of the guide holes 34 has a forming pin 35 as a male mold having a tip suitable for a shape to be formed such as a semi-cylindrical or hemispherical shape.
(Hereinafter sometimes simply referred to as pins) are inserted. During molding, a cylindrical workpiece 24 made of a thin metal is inserted between the female mold 31 and the tip of the molding pin 35. In addition,
A spring 36 is provided around the intermediate portion of the molding pin 35 so as to urge the molding pin 35 in a direction to always retreat. A regulating member 87 for regulating the movable range of the pin 35 is provided at a lower end of the pin guide member 85, and regulates the pin 35 from being pushed up more than necessary by the spring 36. The pin guide member 85 meshes with the pin guide drive shaft 86 in a tooth shape, and can be rotationally moved by the rotation of the pin guide drive motor 81.

Reference numeral 88 denotes a roller support ring rotatably provided to support a plurality of radially displaceable rollers 89, which is disposed to be in contact with the rear end of the molding pin 35. The roller support ring 88 supporting the roller 89 is as shown in FIG. 19, and after the roller 89 is mounted on the mounting portion provided on the outer periphery of the roller support ring 88, the portion where the shaft portions at both ends of the roller are located A steel wire 90 is fitted into the to prevent the rollers from falling off.

The roller support ring 88 meshes with the roller support ring drive shaft 91 in a tooth shape, and both rotate together.
The rotation of the roller support ring 88 is performed by the
When the number of pins is large or the material is high in rigidity, a large driving force is required to rotate the roller support ring 88 because the material to be worked 24 is formed at the tip of the pin by pressing the rear end of the pin. . Therefore, here, the flywheel drive motor 78
A clutch mandrel 94 is engaged with a flywheel 92 rotated by a clutch 93, and a key is attached to the clutch mandrel 94.
By rotating the roller supporting ring drive shaft 91 fixed at 95, the roller supporting ring 88 is rotated. Clutch 93
The air is supplied from a pipe 97 fixed to a fixed frame 96, the air cylinder 98 is operated by the air pressure, the clutch 93 is engaged, and the air cylinder 98 is returned by removing the air. 93 leaves. At this time, the brake clutch operates by the return of the air cylinder 98, and the rotation of the clutch core metal 94, the roller support ring drive shaft 91, and the roller support ring 88 is immediately stopped.

Reference numeral 101 denotes a roller 8 on the outer periphery of the roller support ring 88.
The cam is rotatably disposed in contact with the roller 9 and has a concave portion 102 into which a part of the selected roller 89 fits depending on the relative positional relationship with the roller support ring 88. The cam 101 is rotated by a cam drive motor 26 via bevel gears 27a and 27b. As can be seen from FIG. 17, when the casing 103 is removed, the roller support ring 88, the pin guide member 85 into which the molding pin 35 is inserted, the roller support ring drive shaft 91 and the pin guide as a jig unit shown in FIG. It can be completely removed from the tooth meshing portion with the drive shaft 86, and the structure is easy to maintain.

Next, a method of manufacturing the heat transfer tube according to the third embodiment will be described. The cylindrical work material 24 made of a thin metal is set on the shaft 63, and one end is gripped by the feed roller 72 of the material feed device 65. Then, one end of the workpiece 24 is
The mold is moved to the position of the female mold 31 provided at the tip of 63, and molding is started.

Here, the pin guide member 85 is fixed, the flywheel drive motor 78 is rotated, and the flywheel 92 is rotated via the pulley 79 and the belt 80. Air is supplied from the pipe 97 and the air cylinder 98
When the clutch 93 is engaged by operating
94 is connected to the flywheel 92 and rotates, and the roller support ring 88 rotates via the roller support ring drive shaft 91.
Since the molding pin 35 is inserted into the pin guide member 85 and its circumferential position does not change, only when the roller 89 pushes the rear end of the molding pin 35, the tip of the pin hits the work material 24 to cause plastic deformation. .

However, when the roller 89 is fitted into the concave portion 102 of the cam 101, the rear end of the molding pin 35 is not pushed, so that plastic deformation is avoided. FIG. 18 shows the concave portion 102 of the cam 101 and the roller.
The three cases of the presence or absence of plastic deformation are shown by the positional relationship with 89. Three molding pins 35 adjacent to each other
This is the case where no plastic deformation occurs in any of the books, the case where all three plastic deformations occur, the case where the pins on both sides undergo plastic deformation, and the center pin does not.

When the roller 89 is located between the molding pins, the molding pin 35 is retracted by the spring 36. At that timing, the material rotating member 69 is rotated by a predetermined angle by the material rotating motor 23, and the stepping is performed. The feed roller 72 is rotated by the motor 73 to move a predetermined distance in the direction B,
Shift the molding position. In this way, the rotation and feeding of the work material 24, and the continuous beating operation by the molding pin 35,
A large number of continuous or intermittent uneven lines inclined with respect to the axial direction, so-called herringbone patterns can be formed.

A more specific example will be described with reference to FIGS. 20, 21 and 22. Here, as shown in FIG. 21, 20 molding pins 35 are arranged at regular intervals in the circumferential direction, and a roller support ring 88 having 20 rollers 89 corresponding thereto, and a cam 101 are provided respectively. Cam 101
The recess 10 is provided at an interval corresponding to the
13 are provided (1 to 11 and 1a, 11a).

When manufacturing a heat transfer tube as shown in FIG. 20, the heat transfer surface portion E1 at the center is formed as shown in FIG. 21 (a). That is, when the molding pin 35 and the cam 101 are in the positional relationship shown in FIG. 21A, even if the roller support ring 88 rotates and the roller 89 comes to the rear end of the molding pin 35, the pin a The roller 89, which is in contact with the pin k, fits into the concave portion 102 of the cam 101 and does not push the rear end of the pin, thus avoiding plastic deformation of the material to be processed, but covering all other pins. You will hit the processing material.

This is shown by the presence or absence of plastic deformation performed by the pins r, s, t, a, b, and c on the work material.
It looks like 22 steps. The portion shown by the broken line is the portion where plastic deformation has been avoided. Next, as a step, at the timing when the roller 89 moves between the pins by rotating the roller support ring 88, the material to be processed is moved in the axial direction by a fixed distance, and at the same time, the clockwise movement of the tip end interval of the pins is performed. After rotating by an angle of 360 ° × (1/40) = 9 °, the rear end of the pin is hit with a roller 89.

Next, the workpiece is moved in the axial direction by a fixed distance and rotated clockwise by 9 °.
The 101 is rotated clockwise by 360 ° × (1/20) = 18 °. This is a state in which the concave portion 1a moves to the rear portion of the pin t in a step, and when the roller 89 hits the rear end of the pin there, it becomes like a step. Hereinafter, the steps in FIG.
Forming proceeds as described above, and a non-plastically deformed portion and a heat transfer surface portion E1 having a plurality of diagonal grooves in the axis are formed in portions facing each other parallel to the axis.

If the non-plastically deformed portion is formed in advance at the time of molding, the heat transfer tube is formed into a flat shape and subjected to wire drawing by a press, thereby facilitating edge processing and improving workability. In addition, if non-plastically deformed portions are provided in other portions, when the heat transfer tube is flattened, partition walls are formed in the axial direction as shown in FIG. 15, and a plurality of heat medium passages are formed. Can also be divided.

Next, in order to form the distribution surface portion E2, first, the shaft 63 is moved in the F direction by a predetermined distance by the driving means 64, and the female mold for the distribution surface portion is opposed to the molding pin 35.
Next, the positional relationship between the molding pins 35 and the rollers 89 is arranged as shown in FIG. 21 (b). That is, the molding pin 35 that strikes the workpiece material
Among them, the rollers 89 corresponding to the pins a to k are all fitted into the concave portions 102 of the cam 101, and while the cam 101 is fixed, the roller supporting ring 88 is rotated, and the pins 1 to t are formed. While rotating the material to be processed at a small angle in which the dents are continuous, a row of the dents is formed so as to be continuous with the forming dents of the adjacent pins. Next, after moving the material to be processed in the axial direction by a predetermined distance, the same hitting operation is performed by reversing the rotation of the material to be processed to form the second row of concave portions.
By repeating such operations sequentially, the distribution surface portion E2 can be formed.

To form the distribution surface portion E3, the molding pin 3
The positional relationship between 5 and the roller 89 is arranged as shown in FIG. 21C, and the same forming operation as that of the distribution surface portion E2 is performed. Note that this is achieved by rotating the work material on which the distribution surface portion E2 is formed by 180 °, as shown in FIG.
Needless to say, the arrangement of (b) may be performed. In the case where a non-plastically deformed portion parallel to the axis is left in a part of the distribution surface portions E2 and E3 that are to be plastically deformed, a concave portion 102 may be provided in that portion of the cam 101.

When the number of molding pins 35 is large, a large number of concave and convex strips can be formed with the pin guide member 85 fixed as described above. However, the use of a large number of molding pins complicates the structure and increases the cost of the apparatus. Thus, it is possible to form a large number of uneven stripes with a small number, for example, one or two pins.

For this purpose, the pin guide drive motor (positionable index motor) 81 is rotated, and the gear 82
By driving the pin guide drive shaft 86 through the, the pin guide member 85 is rotated, and the position of the molding pin 35 is sequentially shifted in synchronization with the rotation of the female mold. According to this configuration, the required number of concave and convex strips can be formed with a small number of female dies and the number of pins. In particular, when a small lot of heat transfer tubes and prototypes are manufactured, the cost can be reduced. Can be.

By the way, also in the third embodiment, it is possible to form the irregularities on the heat transfer surface and the distribution surface without using a female mold. The case where the female mold is used and the case where it is not used will be described in comparison.

FIG. 23 shows a case where the unevenness of the heat transfer surface portion E1 is formed by using the tooth-shaped female mold 31a. Reference numeral 31b denotes a female part for forming the distribution surfaces E2 and E3. The inclination angle α of the male mold and the female mold 31a of the molding pin 35 is the same, and the feed and rotation control of the workpiece 24 are also determined by this angle. Therefore,
The inclination angle θ of the concave and convex strips with respect to the axial direction of the heat transfer tube to be formed is equal to the inclination angle α.

FIG. 24 shows a case where hemispherical male and female molds 31d are used. In this case, the inclination angle θ of the uneven stripe
Is controlled by 0 ° ± 30 ~
Processing is possible in the range of 40 °. Therefore, there is a feature that the length and the inclination angle can be arbitrarily formed without setting up.

FIG. 25 shows an example of molding without using a female mold. First, as shown in FIG. 25 (c), when a flat plate is fixed around and pressed with a round bar, a thin plate of about 0.5 to 1 mm is formed. Then, the opening angle
It becomes a conical recess of about 90 °.

Similarly, if a punch is simultaneously pressed into the cylindrical workpiece from the periphery without using a female mold,
As shown in (b), it is possible to form a concave portion of about β = 90 °. At this time, a uniform compressive force acts on the cylindrical workpiece material, and a tensile force acts on the molded portion, so that the molding as shown in FIG. 25 (a) is performed.

After the spiral groove having the opening angle β1 is formed as described above, when the punch is pushed again into the groove, the helical groove shown in FIG.
As shown in, the diameter of the cylinder of the material to be processed becomes smaller,
The forming angle is β2 smaller than β1.

When a female die is not used, a long cylindrical work material is used, and by controlling the feed and rotation, a large number of uneven strips having an arbitrary length parallel or inclined with respect to the axial direction can be raised. It can be formed with productivity.

[0077]

As described above, according to the present invention,
The following effects are obtained. (1) The cylindrical work material set in the female mold is rotated and moved in the axial direction while continuously punching with a plurality of punch-like male molds to successively plastically deform. It is possible to manufacture a heat transfer tube which is inexpensive and can be optimally designed according to various needs without requiring a simple press machine or a large number of expensive dies.

(2) At the time of molding, the inclination angle of the concave and convex strips can be arbitrarily set by changing the rotation and the feed speed of the material to be processed, and the length L of the heat transfer surface portion is also arbitrarily determined. be able to. Further, by appropriately selecting the feed pitch of the material to be processed, various patterns can be formed from an arrangement of dents at regular intervals (a dimple pattern) to a continuous or intermittent waveform (a herringbone pattern).

(3) The pitch of the concave and convex portions can be changed by appropriately thinning out the molding pins, and by providing the rotatable cam with a concave portion, plastic deformation of the partition wall portion and both edges can be avoided. , The subsequent processing can be facilitated.

(4) Since the punching pressure is simultaneously applied to the cylindrical workpiece in a radial direction toward the center or outward by the forming means arranged in the circumferential direction, the tensile stress applied to the forming part is the same. It becomes a state, and the unevenness height becomes uniform plastic deformation. Therefore, when a heat exchanger is configured by stacking a plurality of flat heat transfer tubes manufactured in this manner, no difference occurs in the stacking dimensions. No change occurs in the pressure loss of the passage.

(5) When a cylindrical work material made of a thin metal is fed, a method in which a rotating force or an axial force is applied to an unprocessed portion to extrude the material is used to apply strain to the formed uneven strip. Therefore, it is possible to prevent deformation and a decrease in processing accuracy.

(6) By using the rotational force of the flywheel, a large power can be taken out with a relatively simple configuration, and the size of the molding apparatus can be reduced.

(7) By making the pin guide member rotatable, it is possible to form a required number of concave and convex strips with a small number of molding pins, and it is possible to produce a small lot of heat transfer tubes and prototypes at low cost. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a heat transfer tube manufacturing apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view of a molded part according to the first embodiment.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a schematic configuration diagram of a heat transfer tube manufacturing apparatus according to Embodiment 2 of the present invention.

FIG. 5 is a cross-sectional view of a molded portion according to the second embodiment.

FIG. 6 is a sectional view taken along line YY of FIG. 5;

FIG. 7 is a view showing a first conventional example of a heat transfer plate.

FIG. 8 is a view showing a second conventional example of a heat transfer plate.

FIG. 9 is a view showing a third conventional example of a heat transfer plate.

FIG. 10 is a view showing a conventional method for manufacturing a heat transfer plate.

FIG. 11 is a view showing an example in which two types of heat transfer plates are manufactured using a mold of one heat transfer surface portion.

FIG. 12 is an explanatory diagram of a mold for changing a length L of a heat transfer surface portion.

FIG. 13 is a view showing a heat transfer tube having a dimple pattern according to the present invention.

FIG. 14 is a view showing a heat transfer tube having a herringbone pattern according to the present invention.

FIG. 15 is a view showing a heat transfer tube according to the present invention, in which a partition wall parallel to the axial direction is provided and the passage of the heat medium is divided into a plurality of portions.

FIG. 16 is a schematic configuration diagram of a heat transfer tube manufacturing apparatus according to Embodiment 3 of the present invention.

FIG. 17 is a cross-sectional view of a molded portion according to the third embodiment.

18 is a sectional view taken along the line ZZ in FIG.

FIG. 19 is a perspective view showing a jig unit of a molded portion according to the third embodiment.

FIG. 20 is a perspective view showing an example of a heat transfer tube.

21 is an explanatory diagram of the heat transfer tube forming of FIG. 20.

FIG. 22 is a diagram illustrating a step of forming a heat transfer surface of the heat transfer tube of FIG. 20.

FIG. 23 is an explanatory view in the case of forming uneven stripes using a tooth-shaped female mold.

FIG. 24 is an explanatory diagram in the case of using hemispherical male and female molds.

FIG. 25 is an explanatory diagram in the case of forming an uneven strip without using a female mold.

[Explanation of symbols]

12,45 ... first fixed frame, 13,46 ... second fixed frame, 14,67 ... movable frame, 17 ... ball screw, 2
0… Frame motor, 21… Material chuck, 23… Material rotation motor, 24… Cylindrical work material, 25,63…
Shaft, 26,55… Cam drive motor, 31,50… Female, 32,4
9,74 ... recess, 33,51 ... fixed guide, 34,52 ... guide hole, 35,53 ... molding pin, 37,57,89 ... roller, 38,5
4,101: cam, 41: cam guide member, 60: support shaft, 6
5… material feeder, 69… material rotating member, 70… material gripping member, 72… feed roller, 73… stepping motor, 78… flywheel drive motor, 81… pin guide drive motor, 85… pin guide member, 86… Pin guide drive shaft, 88 ... roller support ring, 91 ... roller support ring drive shaft, 92 ... flywheel, 93 ... clutch,
94 ... clutch core, 98 ... air cylinder, 102 ... recess.

 ──────────────────────────────────────────────────の Continued on the front page (72) Yoshinobu Sato, 3-10-10 Tsukiji, Chuo-ku, Tokyo Inside Nakamura Jikoku Co., Ltd. (72) Tatsuo Nishida, 3-10-10 Tsukiji, Chuo-ku, Tokyo Nakamura Motor Co., Ltd.

Claims (22)

[Claims] 1. A heat exchanger tube of a heat exchanger for performing heat exchange between different heat mediums such as different kinds of liquid and liquid, liquid and gas, and
At right angles to the axial direction, parallel or inclined, or a cylindrical member made of a thin metal having a large number of continuous or intermittent irregularities in a zigzag shape is flattened, and the inner convex portions of the flat portions facing each other are linear. A heat exchanger tube for a heat exchanger, wherein the heat exchanger tubes are in contact with each other in a crossed or crossed manner. 2. The heat exchanger tube according to claim 1, wherein the concave and convex strips are formed by continuous grooves or ridges. 3. The heat exchanger tube according to claim 1, wherein the projections and depressions are formed of depressions or projections arranged at regular intervals. 4. The heat exchanger according to claim 1, wherein one or more partition walls parallel to the axial direction are provided inside the flat cylindrical member, and the heat medium passage is divided into a plurality. Heat transfer tubes. 5. A cylindrical work material made of a thin metal set in a female mold having a plurality of recesses arranged on the circumference and having a substantially U-shaped cross section perpendicular to the axis according to a pattern to be formed. Along with moving in the axial direction, non-moving, one-way rotation, non-rotation, forward / reverse rotation,
The workpiece is plastically deformed by continuously tapping with one or more punch-shaped male molds each facing the female mold, and a large number of continuous or parallel or inclined zigzag shapes with respect to the axial direction or A method of manufacturing a heat transfer tube, comprising forming the cylindrical workpiece material into a flat shape after forming intermittent irregularities. 6. The method according to claim 5, wherein the female mold is not used.
A method for manufacturing a heat transfer tube, wherein a workpiece is plastically deformed by continuously tapping with one or more punch-like male molds. 7. A punch-like male punching operation in a portion corresponding to both edges parallel to the axis when processed flat or a portion corresponding to a partition dividing the heat medium passage is omitted, and a non-plastically deformed portion is provided. The method for manufacturing a heat transfer tube according to claim 5, wherein: 8. A fixed shaft or one or more recesses having a substantially U-shaped cross section perpendicular to the shaft are provided at regular intervals on the outer peripheral surface of the distal end portion of the shaft that can be extended, contracted, and rotatable. A female mold, a pin guide member facing the female mold via a predetermined gap and having one or more radial guide holes, and being inserted into the guide holes, respectively, forming a semi-cylindrical or hemispherical shape. One or more molding pins as male molds having a tip suitable for the shape; cam means for contacting the rear end of the molding pins and rotating to continuously advance and retreat the molding pins; and the female mold Material moving means for axially moving a cylindrical workpiece made of a thin metal inserted between the pin guide member and rotating the molding pin in a forward direction and a reverse direction. At the same timing The material is moved in the axial direction according to the pattern to be formed, non-movable, unidirectional rotation, non-rotation, forward and reverse rotation is selectively performed, and the cylindrical pin is continuously hit by the molding pin. An apparatus for manufacturing a heat transfer tube, comprising forming a plurality of continuous or intermittent irregularities in a shape perpendicular to, parallel to, or inclined with respect to an axial direction, or in a zigzag shape by plastically deforming a workpiece-like material. 9. A cylindrical workpiece material which is rotatable around a female mold, rotates the pin guide member in synchronization with the rotation of the female mold, and sequentially shifts the position of the molding pin. 9. The heat transfer tube manufacturing apparatus according to claim 8, wherein the heat transfer tube is plastically deformed. 10. The heat transfer tube manufacturing apparatus according to claim 8, wherein the material moving means applies a rotational force or an axial force to the unformed portion of the material to be processed and extrudes the material. 11. The heat transfer tube manufacturing apparatus according to claim 8, wherein the female mold is omitted. 12. A first fixed frame (12) and a second fixed frame (13) erected on a base frame (11), and a tip of a shaft (25) extending from the first fixed frame. A concave portion (32) having a substantially U-shaped cross section perpendicular to the axis on the outer peripheral surface.
And a fixed female mold (31) having a plurality of circumferentially arranged at a constant interval, and is fixed to the second fixed frame so as to face the female mold via a predetermined gap, and corresponds to the concave portion. A fixed guide (33) having a plurality of radial guide holes (34), and a plurality of male molds each having a tip suitable for a shape to be molded such as a semi-cylindrical shape or a hemisphere inserted through the guide holes. A shaping pin (35), a cam means (38) which is in contact with the rear end of the shaping pin and rotates to continuously advance and retreat the shaping pin, and a cam driving means (rotationally driving the cam means) 26), a material chuck (21) for holding one end of a cylindrical workpiece (24) made of a thin metal inserted between the female die and the fixed guide, and a rotatably supporting the material chuck. Movable frame (1
4), a frame moving means (20) for moving the movable frame in one direction, and a material rotating means (23) for rotating the material chuck in one direction or the opposite direction, wherein the molding pin is retracted. At the set timing, the cylindrical workpiece is selectively moved in the axial direction according to the pattern to be molded, non-moving, one-way rotation, non-rotation, forward / reverse rotation, and the molding is performed. The cylindrical workpiece is plastically deformed by a continuous tapping operation of a pin for forming a plurality of continuous or intermittent strips having a perpendicular, parallel or inclined, or zigzag shape with respect to the axial direction. Heat transfer tube manufacturing equipment. 13. A cam means (38) having a movable tooth (43) at a required position in contact with a rear end of a molding pin (35), and said cam means and a cam fixed to a second fixed frame. A second cam means (44) is provided between the second cam means (44) and the guide member (41), and when the movable teeth are located in the concave portions of the second cam means, the movable teeth are retracted, and the molding at that portion is performed. 13. The heat transfer tube manufacturing apparatus according to claim 12, wherein a hitting operation of the pin for use on the cylindrical workpiece is avoided. 14. An inner peripheral surface of a fixed ring-shaped member,
A fixed female die having a plurality of concave portions having a substantially U-shaped cross-section perpendicular to the axis at a constant interval in the circumferential direction; fixedly opposed to the female die with a predetermined gap therebetween; A fixed guide having a plurality of corresponding radial guide holes, a molding pin as a male die inserted into each of the guide holes and having a tip suitable for a shape to be molded such as a semi-cylindrical or hemispherical shape; A cam means that contacts the rear end of the forming pin and continuously advances and retreats the forming pin by rotating, and a cylindrical work material made of a thin metal inserted between the female mold and the fixed guide. Material moving means for moving in the axial direction, and rotating in the forward and reverse directions, at the timing when the molding pin is retracted, the cylindrical workpiece is axially moved in accordance with the pattern to be molded. Moving, non-moving, one Directional rotation, non-rotation, and forward and reverse rotation are selectively performed in combination, and the cylindrical workpiece is plastically deformed by a continuous tapping operation of the molding pin, and is perpendicular to, or parallel to, the axial direction. An apparatus for manufacturing a heat transfer tube, wherein a plurality of continuous or intermittent ridges having a slope or a zigzag shape are formed. 15. The heat transfer tube manufacturing apparatus according to claim 12, wherein the female mold is omitted. 16. A first fixed frame (45), a second fixed frame (46), and a third fixed frame (47) erected on a base frame (11), and fixed to the first fixed frame. Installed ring-shaped member (48)
A concave portion having a substantially U-shaped cross section perpendicular to the axis on the inner peripheral surface of
Fixed female mold (50) having a plurality of (49) at regular intervals in the circumferential direction
A fixed guide (51) extending from the second fixed frame to face the female mold via a predetermined gap, and having a plurality of radial guide holes (52) corresponding to the recesses; And a molding pin (53) as a male die having a tip suitable for a shape to be molded such as a semi-cylindrical or hemispherical shape, which is inserted into the guide hole, and is in contact with a rear end of the molding pin. A cam means (54) for continuously moving the molding pin forward and backward by rotating; a cam drive means (55) for rotationally driving the cam means; and a thin wall inserted between the female mold and a fixed guide. A material chuck (21) for holding one end of a cylindrical workpiece material (24) made of metal; and a movable frame (1) for rotatably supporting the material chuck.
4), a frame moving means (20) for moving the movable frame in one direction, and a material rotating means (23) for rotating the material chuck in one direction or the opposite direction, wherein the molding pin is retracted. At the set timing, the cylindrical workpiece is selectively moved in the axial direction according to the pattern to be molded, non-moving, one-way rotation, non-rotation, forward / reverse rotation, and the molding is performed. The cylindrical workpiece is plastically deformed by a continuous tapping operation of a pin for forming a plurality of continuous or intermittent strips having a perpendicular, parallel or inclined, or zigzag shape with respect to the axial direction. Heat transfer tube manufacturing equipment. 17. A cam shaft (54) having a movable tooth (58) at a required position in contact with a rear end of a molding pin (53), and the cam shaft and a support shaft extending from a third fixed frame. And a second cam means (59) between the movable teeth and the second cam means (59).
17. The heat transfer tube according to claim 16, wherein when the movable tooth is located in the concave portion of the cam means, the movable tooth retreats to avoid a hitting operation of the molding pin at the portion with respect to the cylindrical workpiece. Manufacturing equipment. 18. An outer peripheral surface of a tip end of a shaft (63) extending and contracting and rotatable from a first fixed frame (12) erected on a base frame (11), a cross-sectional shape perpendicular to the shaft is substantially formed. A female die (31) having one or more U-shaped concave portions at regular intervals in the circumferential direction, and a female die (31) arranged so as to face the female die with a predetermined gap therebetween and corresponding to the concave portion. More radial guide holes
A pin guide member (85) having a (34), one or more molding pins as male molds each having a tip suitable for the shape to be molded, such as a semi-cylindrical or hemispherical shape, being inserted into the guide holes ( 35) a roller support ring (88) rotatably provided to support one or more rollers (89) that are disposed to be able to abut on the rear end of the molding pin and that can be displaced in the radial direction, A concave portion (102), which is rotatably disposed in contact with the roller on the outer periphery of the roller supporting ring and in which a part of the roller selected by a relative position with respect to the roller supporting ring fits;
A cam driving means (26) for rotationally driving the cam, a roller supporting ring rotating means for rotationally driving the roller supporting ring, and inserted between the female die and a pin guide member. Material feeding means (65) for rotating and moving a cylindrical work material (24) made of thin metal, and a driving means (64) for expanding or contracting or rotating a shaft so as to move the position of the female mold. At the timing when the molding pin is retracted, the cylindrical workpiece is selected from axial movement, non-movement, one-way rotation, non-rotation, and forward / reverse rotation according to the pattern to be molded. In addition to the above, the cylindrical workpiece is plastically deformed by a continuous tapping operation of the molding pin, and is perpendicular to the axial direction, parallel or inclined, or a large number of continuous or zigzag shapes. Intermittent irregularities Apparatus for manufacturing a heat transfer tube, characterized by forming. The pin guide member (85) is rotatable around the female die (31) and includes a pin guide driving means (81) for rotating the pin guide member. 19. The apparatus for manufacturing a heat transfer tube according to claim 18, wherein the pin guide member is rotated in synchronization, and the position of the forming pin is sequentially shifted to plastically deform the cylindrical workpiece. 20. The roller support ring (88) includes a clutch (93).
20. The heat transfer tube manufacturing apparatus according to claim 18, wherein the heat transfer tube is rotated by connection with a flywheel (92). 21. The heat transfer tube manufacturing apparatus according to claim 18, wherein the material feeding means (65) has a structure for gripping and pushing out an unprocessed portion of the material to be processed. 22. A material feeding means (65) is a material rotating motor.
(23) and a material rotating member rotated by the material rotating motor
(69), a material gripping member (70) provided at one end of the material rotating member so as to be slidable in the radial direction, and having a feed roller (72) pressed against the material to be processed (24), and the feed roller. 22. The apparatus for manufacturing a heat transfer tube according to claim 21, comprising a motor (73) for rotating.