JPH10202313A - Method and apparatus for manufacturing inner grooved pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method and a manufacturing apparatus of an inner grooved pipe which can easily adjust the height and the bottom wall thickness of a fin formed on a pipe to be processed. SOLUTION: The pipe to be processed 2 is reduced in diameter through a drawing die 3 and a floating plug 12 arranged in the drawing die 3, and the reduced diameter of the processed pipe 2 is formed in a rolled portion 4 and a rolled portion 4. In the method of manufacturing an inner grooved pipe through the arranged processing plugs 14, the processing plug 14 is formed into a tapered shape, and the position of the processing plug 14 with respect to the rolled portion 4 is adjusted to form the processing plug 14 in the processed pipe 2. The size of the groove 39 to be formed is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a tube having an inner groove, and more particularly to a method for dimensioning a groove.

[0002]

2. Description of the Related Art As shown in FIG. 5, an inner grooved tube manufacturing apparatus 40 for manufacturing a heat transfer tube or the like having a groove on an inner surface is provided.
A rotary head 20 that rotates in the circumferential direction around the outer circumference of the pipe 2 to be processed
And a pair of holding rings 21 and 22 provided inside the rotary head 20, and two holding rings 21 and 22.
And a pressing portion 41 having a plurality of balls 23 that are point-supported and pressed against the outer surface of the pipe 2 to be processed.

The pressing portion 41 is provided between a drawing die 42 for drawing the pipe 2 to be processed and the drawing die 5 located on the drawing side of the drawing die 42.

[0004] Inside the pipe 2 to be processed, a helical projection 44 is formed on the outer periphery, and a grooving plug 45 which is located at the pressing portion 41 of the ball 23 and inscribes with the pipe 2 to be processed. The floating plug 12 which is in contact with the inner wall of the drawing die 42 and located on the introduction side of the drawing die 42 is connected by a tie rod 13, and the working plug 45 is rotatably supported by the floating plug 12 and the tie rod 13.

[0005] The operation of the pipe forming apparatus 40 with an inner groove will be described. The outer diameter of the pipe 2 to be processed is reduced by being pulled out of the drawing die 42. The floating plug 12 is fixed to the introduction side of the drawing die 42 with its outer periphery in contact with the inner wall of the pipe 2 to be processed.

Then, the pipe 2 whose diameter has been reduced moves in the drawing direction and is fed into the rotary head 20. The holding ring 2 provided inside the rotary head 20
The ball 23, which is supported at two points via the bases 1 and 22, is in point contact with the outer periphery of the pipe 2 to be processed, and rotates in the direction indicated by the arrow of the rotary head 20 so as to be in the same direction as the rotational direction of the rotary head 20 And presses the outer periphery of the pipe 2 to be processed.

By the pressing of the ball 23, the inner wall of the pipe 2 to be processed is pressed against a groove cutting plug 45 having a spiral projection 44 formed on the outer periphery. Then, the grooving plug 45 rotates with the movement of the pipe 2 to be processed, and an inner grooved pipe having a spiral continuous groove 39 is formed.

The pipe 2 to be processed is formed into a predetermined outer diameter by being pulled out by a drawing die 5 provided further in the drawing direction.

In such an apparatus 40 for manufacturing a tube with an inner groove, the revolving diameter of the ball 23 is changed to adjust the depth of the groove 39. That is, the pushing amount of the ball 23 is changed.

FIG. 6 shows a cross section of a contact portion between the pressing rings 21 and 22 and the ball 23 as a conventional example for changing the pushing amount.

The pressing rings 21 and 22 are formed with tapered portions 46 and 47 tapering toward the front end on the sides facing each other, and the ball 2 is provided between the tapered portions 46 and 47.
The ball 23 is held by positioning the ball 3.

The adjustment of the pushing amount of the ball 23 is performed by a pair of holding rings 21 divided into two in the axial direction of the pipe 2 to be processed.
22 by adjusting the facing distance. When the facing distance is small (portion indicated by a solid line), the tapered portions 46 and 47 of the holding rings 21 and 22 are close to each other, the ball 23 is pushed in, and the revolving diameter of the ball 23 is reduced. As a result, the ball 23
And the depth of the groove 39 formed on the inner surface of the processed pipe 2 is increased.

On the other hand, the facing distance is wide (portion indicated by a dotted line).
Then, the tapered portions 46 and 47 are separated from each other, the pushing of the ball 23 is reduced, and the revolving diameter of the ball 23 is increased. As a result, the depth of the groove 39 formed on the inner surface of the processed pipe 2 is reduced.

That is, when the interval between the pressing rings 21 and 22 moves by R1, the ball 23 moves by S2 in the radial direction, and the pressing changes.

On the other hand, the dimension of the grooved tube is measured by cutting the grooved tube in the radial direction, polishing the cut surface, and then using a microscope or the like.

[0016]

However, in order to change the fin height (depth of the groove 39) and the bottom wall thickness by changing the tubing 2 to be processed, it is necessary to prepare the tubing having a slightly different wall thickness. There is a problem that requires a great deal of labor for its manufacture and management.

Further, in the method of adjusting the gap between the processing tool and the processing plug 45 having a projection on the outer peripheral portion, the processing tool needs to have a structure capable of moving in the radial direction. When the processing tool is a roll, the structure becomes complicated.

When the processing tool is the ball 23, as an example of adjusting the gap between the ball 23 and the grooving plug 45, the distance between the opposing press rings 21 and 22 is changed so that the ball 23 and the press rings 21 and 22 are separated. By moving the contact point, the ball 23 is moved in the radial direction.

In this case, the pipe 2 to be processed is pulled out toward the entrance of the processing pipe, and the holding rings 21 and 22 and each ball 23 are pulled out.
It is necessary to adjust the distance between the holding rings 21 and 22 by taking out the, so that there is a problem that the adjustment takes time and the operation becomes complicated.

Thus, in the conventional method, the fin height,
When fine adjustment is made to the bottom wall thickness, there are problems such as a complicated apparatus, a long time for the adjustment, and a complicated operation.

In the measurement of the dimension of the groove 39 of the grooved tube, the grooved tube had to be cut in the radial direction and polished, resulting in poor workability. Furthermore, the rolled part 4 in the prior art
In the adjustment of the pushing amount of No. 8 and the measurement of the dimensions, it was difficult to cope with the automation of the dimensioning of the inner grooved pipe.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a method of manufacturing a tube with an inner surface groove which can easily and precisely adjust the height and bottom wall thickness of a fin formed in a tube to be processed and a simple method. An object of the present invention is to provide an apparatus for manufacturing a tube with an inner groove having a simple structure.

[0023]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for reducing the diameter of a pipe to be processed by drawing the pipe through a drawing die and a floating plug disposed in the die. In a method of manufacturing an inner grooved pipe through a rolled portion and a processing plug arranged in the rolled portion, the processing plug is formed in a tapered shape, and a position of the processing plug with respect to the rolled portion is adjusted. The size of the groove formed in the pipe to be processed is adjusted.

In addition, a floating plug and a processing plug having a groove on an outer periphery connected to the floating plug and the tie rod via a tie rod are arranged on the inner surface of the pipe to be processed, and the floating plug is drawn into a die, and the processing plug is connected to the pipe to be processed. Placed on the rolled part to be pushed inward in the radial direction,
After reducing the diameter of the pipe to be processed between the drawing die and the floating plug fastened to the drawing die, the inner grooved pipe manufacturing apparatus for manufacturing the inner grooved pipe between the rolled portion and the processing plug has a tapered processing plug. It is preferable that the processing plug is formed in a tapered shape and the position of the processing plug is freely adjustable with respect to the rolled portion.

The working plug is preferably provided with a movable drawing die so that its position can be adjusted with respect to the rolled portion.

It is preferable to use a processing plug whose groove depth changes according to the taper of the outer surface of the processing plug.

The drawing die is provided so as to be movable in the axial direction of the pipe to be processed by a moving device, and a detecting portion for detecting the amount of movement is provided. By the movement of the drawing die, the drawing die is moved in the radial direction of the pipe to be processed. It is preferable that the amount of pushing into the working plug is adjusted in the rolled portion where the work tube is pushed into the working plug.

Also, a control unit for controlling the operation of the actuator is connected to the actuator of the moving device for moving the drawing die, and a moving amount setting unit for inputting the moving amount of the drawing die is connected to this control unit. And the control unit controls the actuator so that the movement amount of the drawing die detected by the detection unit matches the movement amount of the drawing die set in the setting unit. It is good to

On the drawing side of the drawing die, a measuring unit for measuring the dimension of the groove of the pipe to be processed is provided, and a control unit for controlling the operation of the actuator is connected to the actuator of the moving device for moving the drawing die. The controller is connected to a dimension setting section for setting a groove dimension to be machined on the pipe to be processed, and the measuring section and the detecting section are connected to each other, and the approximate dimension determined from the groove dimension set in the dimension setting section is set. The actuator is controlled so that the movement amount detected by the detection unit matches the movement amount, and when the movement amount is matched, the actuator is controlled to match the groove size measured by the measurement unit with the groove size set by the dimension setting unit. May be controlled.

Further, a floating plug and a processing plug having a groove on the outer periphery connected to the floating plug and the tie rod via a tie rod are arranged on the inner surface of the pipe to be processed, and the floating plug is drawn into a die and the processing plug is connected to the pipe to be processed. Placed on the rolled part to be pushed inward in the radial direction,
After reducing the diameter of the pipe to be processed between the drawing die and the floating plug fastened to the drawing die, the inner grooved pipe manufacturing apparatus for manufacturing the inner grooved pipe between the rolled portion and the processing plug has a tapered processing plug. Formed in a tapered shape, and provided with the processing plug so that the position thereof can be adjusted with respect to the rolled portion, and provided with a measuring portion for non-destructively measuring the groove depth of the pipe to be processed on the drawing side of the drawing die. It is good to

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, an inner grooved pipe manufacturing apparatus 1 includes a drawing die 3 for reducing the diameter of a pipe 2 to be processed, a rolled portion 4 arranged on the drawing side of the drawing die 3, A pulling die 5 disposed further on the pulling side of the portion 4, a moving device 9 having an actuator 8 for moving the pulling die 3, a moving amount setting portion 6 for setting a moving amount of the drawing die 3, Control unit 7 for controlling movement
A detection unit 10 for detecting the amount of movement of the drawing die 3,
A movement amount display unit 11 displays the movement amount of the drawing die 3 detected by the detection unit 10.

The drawing die 3 is provided on the moving device 9 so as to be movable in the axial direction of the pipe 2 to be processed. The floating plug 12 is arranged in the pipe 2 to be inserted into the drawing die 3. I have. The floating plug 12 has a wedge-like shape, and is located on the introduction side of the drawing die 3 so as to be inscribed in the pipe 2 to be processed. One end of a tie rod 13 extending in the direction in which the pipe 2 to be processed is pulled out is connected to the floating plug 12.
A processing plug 14 for forming a groove 39 in the processed pipe 2 is rotatably connected to the other end of the processing pipe 2 in a torsional direction.

As shown in FIG. 2, the processing plug 14 has a tapered taper whose diameter D1 at the tip of the pipe 2 to be processed is smaller than diameter D2 at the side connected to the tie rod 13. And a spiral projection 15 on the outer periphery.
Are formed. The groove 16 on the outer surface of the processing plug 14 formed by the projection 15 is formed so that the groove depth changes in accordance with the taper 17 so as to be deeper from the front end to the rear end of the processing plug 14. I have. And
The position of the processing plug 14 in the drawing direction with respect to the rolled portion 4 is adjusted to adjust the distance between the ball 23 and the processing plug 14 described later.

As shown in FIG. 1, the rolled portion 4 is for pressing the work tube 2 radially inward from the outer peripheral side of the work plug 14 to press the work tube 2 against the work plug 14. A support 19 fixed to the base 18;
A rotary head 20 rotatably supported on the workpiece 2 and rotatably rotating the outer periphery of the processing tube 2 in a circumferential direction, a pair of pressing rings 21 and 22 provided inside the rotary head 20, and two points by the pressing rings 21 and 22. It comprises a plurality of balls 23 supported and pressed against the outer surface of the tube 2 to be processed.

The drawing die 5 is for reducing the diameter of the pipe 2 to be processed to a final diameter.
And is fixed to the base 18 so as to face in the same direction as.

The moving device 9 has a pair of support portions 24 and 25 fixed on the base 18 so as to face each other in the drawing direction of the pipe 2 to be processed, and is rotatable between the support portions 24 and 25. And a nut 27 provided integrally with the drawing die 3 and screwed to the feed rod 26, and a power composed of a plurality of gears 28a and 28b mounted on the feed rod 26. The feed rod 26 is rotated to move the drawing die 3 back and forth in the drawing direction of the pipe 2 to be processed by rotating the feed rod 26.
The actuator 8 is specifically an electric motor such as a servomotor that can freely control the rotation angle, and is connected to a power supply (not shown).

The moving amount setting unit 6 is a means for inputting the moving amount of the drawing die 3 from the outside, and is connected to the control unit 7.

The control unit 7 includes a movement amount setting unit 6 and a detection unit 1
It controls the rotation direction and the rotation amount of the actuator 8 based on the values sent from 0. In addition to the movement amount setting unit 6,
It is connected to the detection unit 10, the movement amount display unit 11, and the actuator 8, respectively.

The detecting unit 10 is provided on a base 18 along the movement trajectory of the drawing die 3, and a number of elements (not shown) for detecting the presence of the drawing die 3 are embedded therein. I have.

Next, the operation will be described.

When manufacturing a tube with an inner groove, first, a desired moving amount is set in the moving amount setting section 6. The movement amount set in the movement amount setting unit 6 is sent to the control unit 7 as a signal, and at the same time, the detection unit 10 detects the position information of the drawing die 3 and sends it to the control unit 7.

The control section 7 sends a control signal to the actuator 8 based on the signal of the movement amount setting section 6 and the signal of the detection section 10.

The actuator 8 rotates based on a signal from the control unit 7. The rotation of the actuator 8 is transmitted to the feed rod 26 via the power transmission device 28, and the feed rod 26 rotates. Therefore, the feed rod 2
A force is applied to the nut 27 screwed into the nut 6 in the direction of the rotation axis, and the drawing die 3 is moved in that direction.

During this time, the amount of movement of the drawing die 3 is always detected by the detection unit 10 and sent as a signal to the control unit 7. The control unit 7 displays the signal sent from the detection unit 10 as a movement amount display unit. Each time, the signal is compared with a signal already sent from the control unit 7. And the control unit 7
Stops the rotation of the actuator 8 so that the signal sent from the detection unit 10 and the signal from the control unit 7 match.

The moving amount display unit 11 sequentially displays the moving amount sent from the control unit 7 so that the moving state of the drawing die 3 can be understood at a glance.

Further, as the drawing die 3 is moved, the floating plug 12 located inside the pipe to be processed 2 on the introduction side of the drawing die 3 is moved together with the drawing die 3 and becomes a floating plug 12. The connected processing plug 14 is also moved.

Specifically, the drawing die 3 is used for the pipe 2 to be processed.
When the floating plug 12 is moved in the drawing direction, the floating plug 12 is moved in the same direction as the drawing die 3 by the frictional force with the pipe 2 to be drawn, and the working plug 14 is also moved in the same direction as the drawing die 3 by the same distance. Will only be moved. Since the processing plug 14 is formed in a tapered shape, the diameter of the processing plug 14 increases at the position of the ball 23, and the ball 23 and the processing plug 14 are formed.
And the pushing force increases. Further, since the groove 16 is formed so as to be deeper from the front end to the rear end of the processing plug 14, the deep groove 39 is formed in the pipe 2 to be processed.
Is formed, and the bottom thickness is formed thin.

When the drawing die 3 is moved in the direction opposite to the drawing direction, the floating plug 12 is pushed by the introduction portion of the drawing die 3 through the pipe 2 to be processed, so that the floating plug 12 is moved in the same direction as the drawing die 3. The working plug 14 is also moved by the same distance in the same direction as the drawing die 3. Since the processing plug 14 is formed in a tapered tapered shape, the diameter of the processing plug 14 is reduced at the position of the ball 23, the distance between the ball 23 and the processing plug 14 is increased, and the pushing force is reduced. Further, since the groove 16 is formed so as to be shallower from the rear end to the front end of the processing plug 14, a shallow groove 39 is formed in the pipe 2 to be processed, and the bottom wall thickness is increased.

Thus, the pipe 2 to be processed is pulled out from the die 3
And the diameter of the processed pipe 2 is reduced through the floating plug 12 disposed in the drawing die 3, and the pipe 2 having the reduced diameter is passed between the rolled portion 4 and the processed plug 14 disposed in the rolled portion 4. In the method for manufacturing a
4 is formed in a tapered shape, and the position of the processing plug 14 with respect to the rolled portion 4 is adjusted to adjust the dimension of the groove 39 formed in the pipe 2 to be processed. By adjusting the position of the processing plug 14,
It is possible to form a groove 16 having a desired size on the inner surface of the substrate.

Further, since the processing plug 14 is formed in a tapered shape and the position of the processing plug 14 is freely adjustable with respect to the rolled portion 4, the groove size of the pipe with the inner surface groove to be manufactured is adjusted. At this time, the work tube 2 can be adjusted without being removed from the inner grooved tube manufacturing apparatus 1 each time, and the working efficiency is improved.

Since the drawing die 3 is provided so as to be movable and the position of the processing plug 14 with respect to the rolled portion 4 can be adjusted freely, the processing plug 14 and the ball 2 can be easily formed with a simple structure.
The pushing force between 3 can be adjusted.

The taper 17 on the outer surface of the processing plug 14
Since the processing plug 14 whose groove depth changes in accordance with the diameter of the processing pipe 2 is used, the groove 39 can be formed in the processing pipe 2 with an optimum groove depth corresponding to the pushing force of the processing pipe 2.

The drawing die 3 is provided so as to be movable in the axial direction of the pipe 2 to be processed by the moving device 9, and a detector 10 for detecting the amount of movement is provided. The processing pipe 2 is formed in the radial direction of the pipe 2
In order to adjust the amount of pressing into the processing plug 14 in the rolled part 4 which presses into the processing plug 4, the processing plug 1 can be easily adjusted.
The pushing force between 4 and ball 23 can be adjusted.

Further, the control unit 7 is connected to the actuator 8 of the moving device 9, and the control unit 7 is connected to the moving amount setting unit 6 and the detecting unit 10. The detection unit 10 detects the amount of movement of the drawing die 3 set to
The actuator 8 is controlled so that the amount of movement of the drawing die 3 detected in the step (4) matches, so that the drawing die 3 can be quickly and accurately moved to a desired position, and the distance between the processing plug 14 and the ball 23 can be easily adjusted. The pushing force can be adjusted.

In the above embodiment, the moving device 9 is connected to the support portions 24 and 25, the feed rod 26, the nut 27,
Although the moving device is constituted by the actuator 8, the moving device is not limited to this, and any other moving device that can move the drawing die 3 continuously and can be fixed at an arbitrary position. It may be.

Next, another embodiment will be described.

As shown in FIG. 3, the internal grooved pipe manufacturing apparatus 30 has a modification to the control system (movement amount setting section 6, control section 7, etc.) of the internal grooved pipe manufacturing apparatus 1 shown in FIG. Things.

The inner grooved pipe manufacturing apparatus 30 is different from the inner grooved pipe manufacturing apparatus 1 in that the moving amount setting section 6 is replaced with a dimension setting section 31.
And a dimension measuring unit 32 for non-destructively measuring the groove depth of the pipe to be processed 2 on the drawing side of the drawing die 5.

Further, the control unit 33 of the apparatus for manufacturing a tube with an inner groove 30 is connected to the dimension setting unit 31, the dimension measuring unit 32, the actuator 8, the detecting unit 10 and the moving amount display unit 11, respectively. Workpiece pipe 2 measured at 32
The actuator 8 is controlled so that the groove depth approaches the dimension value set by the dimension setting unit 31.

As shown in FIG. 3 and FIG.
Reference numeral 2 denotes a radiation source 34 for irradiating radiation (for example, X-rays or the like) toward the pipe 2 to be processed, a radiation detection unit 35 for detecting radiation radiated from the radiation source 34, and a radiation amount change signal. And a casing 37 that surrounds the radiation source 34 and the radiation detection unit 35 and shields the radiation.

The radiation source 34 is disposed just above the pipe 2 to be processed and is appropriately spaced apart therefrom so as to irradiate the pipe 2 to be processed with radiation from a direction perpendicular to the pipe 2 to be processed. The radiation detection unit 35 is disposed immediately below the processing pipe 2, and is capable of detecting a radiation transmitted particularly near the center of the processing pipe 2.

Next, the operation will be described.

When manufacturing a tube with an inner surface groove, first, the size of the groove to be formed on the tube 2 to be processed is set in the size setting section 31.

When receiving the signal (groove dimension value) from the dimension setting section 31, the control section 33 obtains a rough moving distance from the relationship between the moving distance of the drawing die 3 and the groove dimension which is obtained in advance, and this moving distance is obtained. A control signal is sent to the actuator 8 based on the distance and a signal from the detection unit 10.

The actuator 8 rotates based on a signal from the control unit 33. The rotation of the actuator 8 is transmitted to the feed rod 26 via the power transmission device 28, and the feed rod 26 rotates. For this reason, a force in the direction of the rotation axis is applied to the nut 27 screwed to the feed rod 26, and the drawing die 3 is moved in that direction.

During this time, the amount of movement of the drawing die 3 is always detected by the detection unit 10 and sent as a signal to the control unit 33. The control unit 33 displays the signal sent from the detection unit 10 as a movement amount display unit. 11 and each time it is compared with the signal already sent from the control unit 33. Then, the control unit 33, once the signal transmitted from the detector 10 and the signal of the control unit 33 is matched, by operating the dimension measurement portion 32 for measuring the dimensions H _f of the work tube 2 of the groove 39. The measured groove dimension _Hf is sent to the control unit 33 as a signal,
The control unit 33 compares this signal (groove dimension H _f ) with the signal sent from the dimension setting unit 31 in advance and performs a dimension check. If the measured groove dimension _Hf is other than the predetermined dimension, it is determined whether the pushing amount is increased or decreased, and a control signal is sent to the actuator 8. Then, the drawing die 3 is moved while sequentially checking the signals sent from the detection unit 10.

The depth of the groove 39 is measured by measuring the groove dimension of the tube 2 having the groove 39 formed on the inner surface and comparing the measured value with the set value, and moving the drawing die while performing feedback control. The position of the drawing die 3 having a predetermined dimension is determined, and the groove dimension H _{f is formed in the} pipe 2 to be processed.
With the groove portion 39 is formed of, so that the bottom thickness T _w is formed to a thickness corresponding to the groove dimensions H _f.

During this time, the movement amount display section 11 sequentially displays the movement amount sent from the control section 33, so that the movement state of the drawing die 3 can be understood at a glance.

The relationship between the amount of movement of the drawing die 3 and the dimension of the groove of the pipe 2 to be processed is stored while being updated temporarily, and serves as data for the next adjustment.

The dimension measuring unit 32 measures dimensions nondestructively as follows.

The radiation emitted from the radiation source 34 passes through the work tube 2 on the work 38 and
Reach 5 The amount of radiation reaching the radiation detection unit 35 changes depending on the transmission thickness of the processed pipe 2.

The radiation dose passing near the center of the cross section of the pipe 2 to be processed has a very small influence on the circular cross section of the pipe 2 to be processed, and varies depending on the groove size. A change signal of the radiation dose passing near the center of the cross section of the pipe to be processed 2 is calculated as a dimensional change by the processing unit 36 and sent to the control unit 33.

As described above, the dimension measuring section 32 for measuring the dimension of the groove 39 of the pipe 2 to be processed is provided on the drawing side of the drawing die 3, and the control section 33 for controlling the operation of the actuator 8 is connected to the actuator 8. The controller 33 is connected to a dimension setting unit 31 for setting the dimension of the groove to be machined on the pipe 2 to be processed, and the dimension measuring unit 32 and the detecting unit 10 are connected to each other. The actuator 8 is controlled so that the movement amount detected by the detection unit 10 matches the approximate movement amount, and when the movement amount matches, the groove dimension H _f measured by the dimension measurement unit 32 to the groove dimension set in the dimension setting unit 31. Since the actuator 8 is controlled so as to match, the groove 39 having the set depth can be easily formed simply by setting the desired groove depth in the dimension setting section 31. It can be.

Further, since the dimension measuring section 32 for non-destructively measuring the groove depth of the pipe 2 to be processed is provided on the drawing side of the drawing die 3, the groove depth of the pipe 2 to be processed is measured without destruction. The dimensions of the groove 39 formed in the processing tube can be adjusted.

Then, a rough moving amount is obtained by using the relationship between the moving amount of the drawing die 3 and the groove size of the pipe 2 to be processed, and the drawing die 3 is moved by the moving amount in advance. The control using the X-ray measurement can be only the fine adjustment of the position of the drawing die 3, and the drawing die 3 can be quickly moved to a predetermined position.

[0077] Also, the relationship between the movement and the work tube 2 of the groove dimensions H _f of drawing die 3, which is adapted to store while interim update, drawing die 3 which is obtained from the groove dimensions are set to a dimension setting portion 31 Can be moved with high precision, and the drawing die 3 can be quickly moved to a predetermined position.

A dimension measuring section 32 for non-destructively measuring the groove depth of the pipe 2 to be processed is arranged on the drawing side of the drawing die 5 with reference to the groove depth of the pipe 2 to be processed substantially. Since the movement of the drawing die 3 is controlled, the groove 39 of the pipe 2 to be processed at the end of processing can be reliably formed to a desired groove size.

The dimension measuring section is not limited to the one using radiation, but may be another one that can measure the groove depth of the pipe to be processed in a non-destructive manner.

[0080]

In summary, according to the present invention, the following excellent effects can be obtained.

(1) According to the first aspect of the invention, by adjusting the position of the processing plug with respect to the rolled portion, a groove having a desired size is formed with high precision on the inner surface of the pipe to be processed. It becomes possible.

(2) According to the second aspect of the invention, it is possible to adjust the dimension of the groove formed in the inner grooved tube without removing the pipe to be processed from the inner grooved tube manufacturing apparatus.

(3) According to the third aspect of the invention, the pushing force between the processing plug and the ball can be easily adjusted.

(4) According to the fourth aspect of the present invention, a groove can be formed in a processing pipe with a processing plug having an optimum groove depth corresponding to the pushing force of the processing pipe.

(5) According to the fifth aspect of the invention, the pushing force between the processing plug and the ball can be easily adjusted.

(6) According to the sixth aspect of the invention, the drawing die can be quickly and accurately moved to a desired position.

(7) According to the seventh aspect of the present invention, a groove having a set depth can be easily formed in a pipe to be processed.

(8) According to the eighth aspect of the invention, it is possible to adjust the dimension of the groove formed in the inner grooved pipe while measuring the groove depth of the pipe to be processed in a non-destructive manner.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an inner grooved pipe manufacturing apparatus showing a preferred embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a side sectional view of an internal grooved pipe manufacturing apparatus showing another embodiment.

FIG. 4 is an explanatory diagram of a main part of FIG. 3;

FIG. 5 is a side sectional view of a conventional apparatus for manufacturing a tube with an inner groove.

FIG. 6 is an explanatory diagram of a main part of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe manufacturing apparatus with an inner surface groove 2 Pipe to be processed 3 Drawing die 4 Rolling part 6 Moving amount setting part 7 Control part 8 Actuator 9 Moving device 10 Detecting part 12 Floating plug 13 Tie rod 14 Processing plug 16 Groove 17 Taper 31 Dimension setting part 32 Dimension measurement part (measurement part) 33 Control part 39 Groove part

Claims (8)

[Claims] 1. A pipe to be processed is reduced in diameter through a drawing die and a floating plug arranged in the die.
In a method of manufacturing an inner grooved tube through the rolled portion and a processing plug arranged in the rolled portion, the processed plug is formed into a tapered tapered shape,
A method for manufacturing an inner grooved pipe, comprising adjusting a position of a processing plug with respect to a rolled portion to adjust a dimension of a groove formed in a pipe to be processed. 2. A floating plug and a processing plug having a groove on an outer periphery connected to the floating plug and the tie rod via a tie rod are arranged on the inner surface of the pipe to be processed. It is placed in the rolled part to be pushed inward in the radial direction, and the pipe to be processed is reduced in diameter between the drawing die and the floating plug fixed to the drawing die, and then a pipe with an inner groove is manufactured between the rolled part and the processing plug In the pipe manufacturing apparatus with an inner groove, the working plug is formed in a tapered shape, and
An inner grooved pipe manufacturing apparatus characterized in that the processing plug is provided so as to be adjustable in position with respect to a rolled portion. 3. The manufacturing apparatus according to claim 2, wherein the processing plug is provided with a movable drawing die so that the position thereof can be adjusted with respect to the rolled portion. 4. The manufacturing apparatus according to claim 2, wherein a processing plug whose groove depth changes according to the taper of the outer surface of the processing plug is used. 5. A drawing die is provided so as to be movable in an axial direction of a pipe to be processed by a moving device, and a detection unit for detecting an amount of movement is provided, and the drawing die is moved in a radial direction of the pipe to be processed by movement of the drawing die. 5. The apparatus for manufacturing a tube with an inner groove according to claim 2, wherein an amount of pushing into the working plug is adjusted in a rolling portion that pushes the work tube into the working plug. 6. A control unit for controlling the operation of the actuator is connected to an actuator of the moving device for moving the drawing die, and a moving amount setting unit for inputting a moving amount of the drawing die is connected to the control unit. And the control unit controls the actuator so that the movement amount of the drawing die detected by the detection unit matches the movement amount of the drawing die set in the setting unit. Item 6. An apparatus for manufacturing a tube with an inner surface groove according to Item 5. 7. A drawing section for measuring a dimension of a groove of a pipe to be processed is provided on a drawing side of the drawing die, and a control section for controlling an operation of the actuator is connected to an actuator of the moving device for moving the drawing die. Then, the control unit is connected to a dimension setting unit for setting a groove dimension to be machined on the pipe to be processed, and the measurement unit and the detection unit are connected to each other, and an approximate value determined from the groove dimension set in the dimension setting unit is set. The actuator is controlled so that the movement amount detected by the detection unit matches the movement amount, and when the movement amount is matched, the actuator is controlled to match the groove size measured by the measurement unit with the groove size set by the dimension setting unit. The apparatus for producing a tube with an inner surface groove according to claim 5, wherein 8. A floating plug and a processing plug having a groove on an outer periphery connected to the floating plug and the tie rod via a tie rod are arranged on an inner surface of the pipe to be processed, the floating plug is drawn into a die, and the processing plug is connected to the pipe to be processed. It is placed in the rolled part to be pushed inward in the radial direction, and the pipe to be processed is reduced in diameter between the drawing die and the floating plug fixed to the drawing die, and then a pipe with an inner groove is manufactured between the rolled part and the processing plug In the pipe manufacturing apparatus with an inner groove, the working plug is formed in a tapered shape, and
The processing plug is provided so that the position can be adjusted with respect to the rolled part,
An apparatus for manufacturing a tube with an inner surface groove, wherein a measuring unit for non-destructively measuring a groove depth of a pipe to be processed is provided on a drawing side of the drawing die.