JPH0949694A - Corrugated fin manufacturing method - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the height H of the corrugated fin is high,
Provided is a method of manufacturing a corrugated fin that can be easily manufactured. [Structure] A cutout portion 17 is provided in a part of a planned bending portion 15 of the band-shaped material 13, and the material 13 is bent along the planned bending portion including the cutout portion and preformed into a corrugated shape. The one end of the preformed material 13 is used as a reference, the other end is pressed toward the one end side, or the one end and the other end of the material are pressed toward the other end and the one end side, respectively, so that the material is bent into a corrugated shape. It is what is molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a corrugated fin for forming a heat radiating portion of a fin-tube type heat exchanger, for example.

[0002]

2. Description of the Related Art Generally, a fin-tube type is known as a heat exchanger such as a condenser or an evaporator used in a refrigerating machine such as a refrigerator or a showcase. In this type, as shown in FIG. 12, a general method of manufacturing a corrugated fin that forms a heat radiating portion of a heat exchanger is, as shown in FIG. 12, an upper forming blade 100 having a downward convex blade and a lower forming blade having an upward concave blade. Using a press molding machine having a blade 200, an upper molding blade 100 and a lower molding blade 20 of this press molding machine are used.
By sandwiching and pressing the strip-shaped material 300 wound around a roll (not shown) between 0 and 0,
The belt-shaped material 300 is bent into a corrugated shape for final molding (see, for example, Japanese Patent Laid-Open No. 55-20353).

[0003]

However, according to the conventional manufacturing method, the higher the height H of the corrugated fin to be manufactured, the more the band-shaped material 300 wound on the roll (not shown) in the manufacturing stage. However, there is a problem that the amount of the strip-shaped material 300 pulled in the direction A increases and the strip-shaped material 300 cannot be smoothly supplied, and the strip-shaped material 300 breaks in the middle. The height H of the corrugated fin, which is the limit at this time, varies depending on conditions such as fin pitch, fin material, and fin plate thickness, but is about H = 30 mm. For example, if H = 35 mm or more, as described above, May lead to the problem of fracture. This band material 3
If 00 breaks in the middle of manufacturing, the band-shaped material 300 has to be set again in the press machine, and there is a problem that the production efficiency decreases. Further, in the conventional method, when the height of the corrugated fins is set to H = 35 mm or more, for example, the vertical distance operation distance of the press machine becomes large, so that there is a problem that the productivity is reduced accordingly. Furthermore, if the height of the corrugated fins is set to H = 35 mm or more as described above, the width P of the peaks and valleys must be increased accordingly, and the pitch between the fins increases. There is a problem that it is difficult to obtain the required heat radiation area of the heat exchanger after manufacturing.

Further, according to the conventional method, when the thickness of the strip-shaped material 300 is large, the width P of the peak portion and the width of the valley portion are caused by the difference between the inner radius r and the outer radius R of the bent portion M of the corrugated fin. P
Therefore, there is a problem that the entire corrugated fin is bent as shown by the dotted line in FIG. 13 when the corrugated is bent.

Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional technique and to provide a method of manufacturing a corrugated fin, which allows the corrugated fin to have a high height H to be manufactured easily. Especially.

[0006]

According to the first aspect of the present invention,
A notch is provided in a part of the band-shaped material to be bent, and the material is bent along the part to be bent including the notch to be preformed into a corrugated shape, and one end of the preformed material is formed. By pressing the other end to the one end side or the one end and the other end of the material to the other end and the one end side, respectively, the material is bent and finally formed into a corrugated shape.

According to a second aspect of the present invention, a rib extending in the longitudinal direction is provided in the strip-shaped material, and a weak point portion is provided in the rib located at the planned bending portion of the strip-shaped material, and the planned bending portion including the weak point portion. The material is bent along with to preform in a corrugated shape, and the other end is pressed to the one end side with one end of the preformed material as a reference, or one end and the other end of the material are respectively the other end and the one end side. The material is bent by being pressed to and is finally molded into a corrugated shape.

[0008]

According to the first aspect of the present invention, since the notch is provided in a part of the band-shaped material to be bent, the portion including the notch becomes weak in strength. At the stage of bending the material along the planned bending part including the notch and preforming it in a corrugated shape, it becomes extremely easy to bend,
Further, the one end of the preformed material is used as a reference and the other end is pressed toward the one end side, or the one end and the other end of the material are pressed toward the other end and the one end side, respectively, so that the material is bent and finally formed into a corrugated shape. Therefore, in this final step, the material is easily bent along the portion to be bent, which is weak in strength. Therefore, even a corrugated fin having a high height H can be easily manufactured.

According to the second aspect of the present invention, since the rib located at the portion to be bent of the band-shaped material having the rib extending in the longitudinal direction is provided with the weak point, the portion including the weak point is strong. Since it becomes weaker, it becomes extremely easy to bend at the stage of bending the material along the planned bending part including this weak point and preforming it into a corrugated shape, and at the final stage, the material is easily bent as described above. To be Therefore, this also makes it possible to easily manufacture a corrugated fin having a high height H.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for manufacturing a corrugated fin according to the present invention will be described below with reference to the accompanying drawings.

9 to 11, reference numeral 1 indicates a corrugated fin manufactured by the manufacturing method described in detail below. This corrugated fin 1 is provided with a plurality of recessed grooves 3 on the upper and lower sides, and a tube 5 bent in a serpentine shape is fitted into these recessed grooves 3 as shown in the drawing, whereby a refrigerating machine such as a refrigerator or a showcase is installed. A fin-tube type heat exchanger suitable as a heat exchanger for condensers, evaporators and the like used in the above is manufactured. Reference numeral 7 is a reinforcing rib.

Referring to FIG. 1, reference numeral 10 denotes a roll, and a roll-shaped material 13 made of aluminum is wound around the roll 10. Hereinafter, in the present specification, the term “aluminum” includes “aluminum alloy” in addition to “pure aluminum”. As shown in FIG. 2, the band-shaped material 13 is provided in advance with a planned bending portion 15 extending in the lateral direction of the band-shaped material 13, and a part of the planned bending portion 15 is
As shown in FIG. 3, a notch portion (hatched but elongated hole) 17 is provided parallel to the bending direction. The cutout portion 17 is formed on the strip-shaped material 1 as described later.
A part (notch portion) of the band-shaped material 13 is weakened in strength so as to be easily bent in the step of bending 3. The width of the cutout portion 17 is formed to be slightly larger than the width of the planned bending portion 15 or substantially equal to the width of the planned bending portion 15. Incidentally, in FIG. 2, reference numeral 3a is an expanded view of the above-mentioned concave groove 3 (FIG. 9).

In FIG. 1, the strip-shaped material 13 wound on the roll 10 is unrolled in order from the roll 10 and, in the press machine 20, an upper forming blade 21 having a trapezoidal downward convex blade and an upward trapezoidal shape. It is sandwiched between the lower forming blade 23 having a concave blade and pressed by the vertical movement of the upper forming blade 21 and the lower forming blade 23.
Is folded between the upper forming blade 21 and the lower forming blade 23 along the planned bending portion 15 including the cutout portion 17, and is preformed 50 in a corrugated shape as shown in FIG. This preforming 50 has a notch 17 in the portion 15 to be bent,
It is easily performed as much as the portion to be bent 15 is weak in strength. In FIG. 4, the width W of the joint 170 remaining after punching out the notch 17 is 1 mm to 10 mm.
It is desirable to set the degree. The width W of the joint portion 170 is 1
This is because if the width is less than or equal to mm, the joint portion 170 may be cut during bending, and if the width W of the joint portion 170 is greater than or equal to 10 mm, the resistance becomes large and the preforming 50 becomes difficult.

In this preforming step 50, the preforming step 5
The height h (FIG. 1) of the corrugated fin 1 to be zero is the height H of the corrugated fin 1 as the final product (for example, H =
35 mm or more), the amount of drawing of the strip-shaped material 13 wound around the roll 10 in the A direction is smaller than that of the conventional one at this stage, and the strip-shaped material 13 in the A direction is reduced. Smoothly supplied, band-shaped material 1
Trouble such as breakage of 3 can be suppressed. Therefore, since the strip material 13 does not come off from the press machine 20,
There is no resetting, and production efficiency will not drop.

Further, since the height h of the corrugated fins 1 to be preformed 50 is low, the vertical movement distance of the press machine 20 is small, and the productivity is improved accordingly. Furthermore, since the height h of the corrugated fins is relatively low, the width p of the crests and troughs can be reduced accordingly, so that the fin pitch does not increase, and the heat exchanger after manufacturing is correspondingly reduced in size. The required heat dissipation area can be increased.

Further, since the bending radius of the bent portion M of the corrugated fin 1 is large, there is no difficulty in bending the corrugated fin 1, and the entire corrugated fin is curved as shown by the dotted line in FIG. There is nothing to do.

The band-shaped material 13 that has been preformed 50 is cut by the cutting blade 25 (FIG. 1) and sent to the final forming stage. In this final forming step, as shown in FIG. 5, the band-shaped material 13 that has been preformed 50 is positioned between the blocks 31 and 33, and the other end 13 based on one end 13a of the band-shaped material 13 is used as a reference.
By pressing b toward one end 13a side, the band-shaped material 13
Is bent and finally molded into a corrugated shape.

This final molding 55 step is simple. That is, since the band-shaped material 13 is provided with the cutout portion 17 and the band-shaped material 13 is connected only by the joint portion 170, the planned bending portion 15 is weak in strength, and the other end 13b is based on the one end 13a of the band-shaped material 13. By pressing at the one end 13a side, the band-shaped material 13 can be easily bent as shown in the drawing, and the final shape 55 requiring substantially no correction can be easily obtained.

In the final molding step, the method of the above embodiment is not limited, and for example, one end 13a and the other end 13b of the band-shaped material 13 are respectively the other end 13b and the one end 1.
The band-shaped material 13 may be bent by pressing it to the side of 3a and finally formed 55 in a corrugated shape.

Next, another embodiment will be described.

As shown in FIG. 6a, the strip material 13 includes
A rib 35 extending in the longitudinal direction is provided in advance. The rib 35 is formed by pressing the strip material 13 in the longitudinal direction as shown in FIG. 6b. Then, as shown in FIG. 7, a jig 36 is used for the rib 35 of the band-shaped material 13, and a V-shaped weak point portion (hereinafter, referred to as a pushing point) is previously provided at a position corresponding to the planned bending portion 15 of the band-shaped material 13. 37)
Is provided.

The band-shaped material 13 is wound on a roll 10 (see FIG. 1) in the same manner as in the above-mentioned embodiment, and the roll 1 is rolled.
It is fed out in order from 0, and is sandwiched in the press machine 20 between an upper forming blade 21 having a trapezoidal downward convex blade and a lower forming blade 23 also having a trapezoidal upward concave blade,
The upper forming blade 21 and the lower forming blade 23 are pressed up and down, whereby the band-shaped material 13 is bent along the planned bending portion 15 including the cutout portion 37 between the upper forming blade 21 and the lower forming blade 23. To be That is, as shown in FIG. 8a, preforming 50 is performed in a corrugated shape. At the stage of the preforming 50, the rib-shaped material 13 is reinforced by the amount corresponding to the ribs 35 provided, but the V-shaped crushed portion 37 is present, so that the folding is performed. Bending part 15
Since it is weaker than other parts, this bending process is extremely easy. In the peak portion of the corrugated fin 1, as shown in FIG. 8b, the V-shaped crushed portions 37 are bent away from each other, and in the valley portion, as shown in FIG. 8c, the V-shaped crushed portion 37 is formed. Are folded so that they approach each other.

The strip material 13 thus preformed 50 is cut by the cutting blade 25 (FIG. 1) and sent to the final forming stage. In this final forming step, as in the above (FIG. 5), the preformed band-shaped material 13 is positioned between the blocks 31 and 33, and one end 13a of the band-shaped material 13 is positioned.
By pressing the other end 13b toward the one end 13a side with reference to, the band-shaped material 13 is bent and finally formed into a corrugated shape. The reason why the step of the final molding 55 is simply performed is for almost the same reason as in the above-described embodiment.

Also by this, the height h (FIG. 1) of the corrugated fin 1 to be preformed 50 can be suppressed lower than the height H of the corrugated fin 1 as the final product, so that the above-mentioned various problems are caused. It can be effectively resolved.

Further, in this embodiment, the planned bending portion 15
Since the V-shaped crushing portion 37 is provided at the position corresponding to, there is also an effect such that the bending position does not shift in the preforming step and the final forming step. The crushed portion 37 constitutes a weak point portion, and if so, it is not necessary to form a weak point portion by providing notches or slits without forming the weak point portion by crushing. It is possible.

Although the present invention has been described with reference to the embodiment, the present invention is not limited to this. For example, the device according to the blocks 31, 33 in the final forming stage may be a roll with gears. Also, rib 3
It is obvious that 5 can be formed not only by bending the band-shaped material 13 but also by brazing or welding another member.

[0027]

As is apparent from the above description, according to the first and second aspects of the present invention, a notch is provided in a part of the portion to be bent of the band-shaped material, or a rib extending in the longitudinal direction is provided. A weak point is provided on the rib located at the planned bending portion of the band-shaped material, and the material is bent along the planned bending portion including the notch or the weak point to preform into a corrugated shape, and then the final Since it is molded, even a corrugated fin having a high height H can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a method for manufacturing a corrugated fin according to the present invention.

FIG. 2 is a plan view showing an example of a band-shaped material.

FIG. 3 is a view showing a part III in FIG.

FIG. 4 is a perspective view showing a stage of preforming.

FIG. 5 is a cross-sectional view showing a stage of final molding.

FIG. 6A is a plan view showing another example of the band-shaped material, and b
Is also an end view.

FIG. 7 is a cross-sectional view showing a state in which a crushed portion is formed on a rib of a band-shaped material.

8A is a perspective view showing a stage of preforming according to another embodiment, FIG. 8B is a sectional view of a crest portion, and c is a sectional view of a trough portion.

FIG. 9 is a perspective view showing a part of the heat exchanger.

FIG. 10 is a front view showing a heat exchanger.

FIG. 11 is a side view of the same.

FIG. 12 is a cross-sectional view showing a method of manufacturing a conventional corrugated fin.

FIG. 13 is a sectional view showing a corrugated fin.

[Explanation of symbols]

 10 Roll 13 Band Material 15 Planned Bending Part 17 Notch Part 20 Press Machine 35 Rib 37 Weak Point Part

Claims (2)

[Claims] 1. A band-shaped material is provided with a notch in a part to be bent, and the material is bent along a part to be bent including the notch to be preformed into a corrugated shape and preformed. Based on one end of the material, the other end is pressed to the one end side,
Alternatively, a method of manufacturing a corrugated fin, wherein the material is bent by pressing one end and the other end of the material to the other end and the one end side, respectively, and finally molded into a corrugated shape. 2. A strip-shaped material is provided with a rib extending in the longitudinal direction, a weak point portion is provided on the rib located at a portion to be bent of the belt-shaped material, and the material is attached along the portion to be bent including the weak point portion. By bending and preforming in a corrugated shape, pressing the other end to the one end side with one end of the preformed material as a reference, or pressing one end and the other end of the material to the other end and the one end side, respectively, A method for manufacturing a corrugated fin, which comprises bending a material and finally forming it into a corrugated shape.