JP2014087823A - Fin molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fin molding apparatus in which the apex of a fin can be formed in a regular surface with no unevenness in press-forming of the fin.SOLUTION: A fin molding apparatus forms a wavy fin usable for a heat exchanger by sandwiching a tabular fin material 3 between a pair of metal molds 1 and 2 and pressing the fin material. At least one of the pair of metal molds 1 and 2 is provided with an air relief groove 4 which extends in a supply direction of the fin material 3.

Description

  The present invention relates to a fin forming apparatus for forming fins of a heat exchanger.

As a conventional fin forming apparatus, those described in Patent Document 1 and Patent Document 2 are known.
The conventional fin forming apparatus described in Patent Document 1 includes a pair of upper and lower molds for pressing and a cutter that forms a louver provided on a tooth surface of the mold. When the strip plate material passes between the upper and lower molds, the band plate material is bent along the teeth of the molds so that the bent part and the louver are configured substantially simultaneously.

Moreover, the conventional fin shaping | molding apparatus described in patent document 2 is provided with the male type | mold projection part and the entrance side and exit side presser board arrange | positioned at this both sides in a male type | mold, and can be opened and closed according to this vertical motion. The first and second mold members are provided on the female mold, and the first and second notch portions that form the mold grooves when the first and second mold members are in contact with each other to form the mold are first and second notches. A first positioning protrusion provided on the first and second mold members and continuously formed in the first notch, a second positioning protrusion formed adjacent thereto, and a positioning formed between these protrusions; A positioning portion comprising a groove is provided on the first mold member, and the male protrusion lowered together with the male mold is inserted into the mold groove so that the male protrusion is supplied between the male protrusion and the mold. A flat plate is formed into a corrugated shape. Further, at the time of forming the corrugation, the flat plate is pressed by the respective pressing plates, and the corrugated previously formed is positioned in the positioning groove, thereby positioning the flat plate.
A wrist-like body composed of first and second wrist-like protrusions and a wrist-like groove formed between them is provided at the lower part of the outlet side presser plate so as to be displaceable along the feed direction of the flat plate, and the male die is lowered. At this time, the first wrist-like projection is inserted into the positioning groove, and the second wrist-like projection is inserted into the wrist-like groove, so that the previously formed corrugation is simultaneously subjected to upper and lower re-striking.

JP 2002-267339 A JP 2009-78276 A

However, each of the above conventional fin forming apparatuses has the following problems.
Although not directly disclosed in the above publication, in such a conventional fin forming apparatus, after forming fins with a pair of press molds, holes are formed in the valleys of the lower mold. Is placed inside the mold so that the spring-biased ejector pin penetrates from there, and after molding, when the upper mold rises, the fin molded with the ejector pin It is pushed up away from the mold.

In this case, when the fin is press-molded, a part of the air between them is gathered in the hole by being pressed by the pair of molds. In this case, since the air cannot be completely escaped and is pressed with the air remaining, a convex dent is generated at a portion corresponding to the hole of the fin, that is, at the top of the fin.
Further, when press molding is repeated, the processing oil is accumulated on the upper surface of the lower mold, and the surface pressing force increases accordingly, and a convex dent is generated at the top of the fin.
The larger the hole diameter, the larger the deformation of the product (fin). On the other hand, when the hole diameter is small, the dent penetrates the product.
If a dent is left on the top of the fin in this way, the top of the fin becomes a non-uniform surface, resulting in a problem of poor coupling with the joining member.

  The present invention has been made paying attention to the above-mentioned problems, and the object of the present invention is to form the fins so that the tops of the fins can be made to have a uniform surface without unevenness when the fins are press-molded. To provide an apparatus.

For this purpose, the fin forming apparatus of the present invention is:
In a fin molding device that molds a corrugated fin used in a heat exchanger by sandwiching and pressing a plate-shaped fin material between a pair of molds,
At least one of the pair of molds is provided with an air escape groove extending in the supply direction of the fin material.
It is characterized by that.

Preferably, the mold provided with the air escape groove is divided from each other in a direction perpendicular to the fin material supply direction along the air escape groove.
It is characterized by that.

Preferably, the air escape groove is disposed on the side of the mold on the right side and / or the left side from the center in the direction perpendicular to the supply direction of the fin material.
It is characterized by that.

Preferably, the ends of the right side and / or left side of the center in the direction perpendicular to the supply direction of the fin material of the air escape groove are open to the atmosphere.
It is characterized by that.

Preferably, an air supply unit that blows air to the fin material through the air escape groove to separate the fin material from the mold is provided.
It is characterized by that.

Preferably, the fin is an inner fin.
It is characterized by that.

Also preferably, the fin molding method of the present invention comprises:
In a fin molding method for molding a corrugated fin used in a heat exchanger by sandwiching and pressing a plate-shaped fin material between a pair of molds,
When sandwiching and pressing the fin material between a pair of molds, air between the molds is released to the outside of the mold from an air relief groove provided in at least one of the pair of molds and extending in the fin material supply direction. Like,
It is characterized by that.

  In the fin molding device of the present invention, when the fin material is sandwiched between a pair of molds and pressed, air and processing oil that exist between the molds can escape from the air escape groove to the outside of the mold. For this reason, generation | occurrence | production of the dent of the fin top part which generate | occur | produces with air and process oil remaining can be prevented, and when carrying out the press molding of a fin, the top part of a fin is made into a uniform surface without unevenness, and it is a Bonding can be performed satisfactorily.

  In the fin molding device of the present invention, the mold provided with the air escape groove is divided along the air escape groove in the direction perpendicular to the fin material supply direction. An air escape groove can be easily formed, and a passage for supplying air for separating the fin material from the mold can be arranged in the divided portion of the mold.

  In the fin forming apparatus of the present invention, the air escape groove is arranged on the right side and / or the left side from the center in the direction perpendicular to the supply direction of the fin material. Can be appropriately discharged.

  In the fin molding device of the present invention, the ends of the right side and / or left side of the center of the air escape groove in the direction perpendicular to the fin material supply direction are open to the atmosphere. The air between the molds can be easily released to the atmosphere, and air can be vented more reliably.

  Further, the fin forming apparatus of the present invention includes an air supply unit that blows air to the fin material through the air escape groove to separate the fin material from the mold, and therefore presses through the air escape groove. The air between the molds inside can be released, and the fin material can be separated from the mold by supplying air from the air supply part to the fin material through the air escape groove after pressing. .

  The fin forming apparatus of the present invention is most suitable for forming the inner fin of the heat exchanger.

  Further, in the fin molding method of the present invention, when the fin material is sandwiched and pressed between the pair of molds, the air escape groove provided in at least one of the pair of molds and extending in the supply direction of the fin material, The air inside the mold is allowed to escape to the outside of the mold, so that it is possible to prevent the occurrence of dents on the top of the fin caused by air and processing oil remaining, and the top of the fin is uneven when pressing the fin. Thus, the fins and the connecting members can be satisfactorily bonded to each other with a uniform surface.

It is side surface sectional drawing seen along the II line | wire of FIG. 2 of the fin shaping | molding state of the fin shaping | molding apparatus which concerns on Example 1 of this invention. It is a top view of the fin shaping | molding apparatus of Example 1. FIG. FIG. 3 is a side cross-sectional view of the fin forming apparatus of Example 1 taken along line III-III in FIG. 2.

  Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings.

First, the overall configuration of the fin forming apparatus of Example 1 will be described.
As shown in FIGS. 1 to 3, the fin forming apparatus according to the first embodiment includes a pair of molds including an upper mold (punch) 1 and a lower mold (die) 2.
The upper mold 1 can be moved up and down by a hydraulic device (not shown), and the lower mold 2 is fixed.
Further, as shown in FIG. 2, the lower mold 2 includes a first lower mold 2a and a first mold 2a which are divided along the supply direction of the fin material 3 by the middle king in a direction perpendicular to the supply direction. The two lower molds are configured to be attached to each other at these divided portions.

  On the lower surface of the upper mold 1, a concave portion 11 for forming the peak portion 31 of the fin member 3, a convex portion 12 for forming the valley portion 32 of the fin member 3, and an inclined portion 13 for connecting them. Is provided.

Similarly, on the lower surface of the lower mold 2, a concave portion 21 for forming the valley portion 32 of the fin member 3, a convex portion 22 for forming the peak portion 31 of the fin member 3, and an inclination connecting these portions A part 23 is provided.
In the first embodiment, two concave portions 11 of the upper mold 1 and two convex portions 22 of the lower mold 2 are formed, but the number is not limited thereto.

In the width direction of the lower mold 2 (the vertical direction in FIG. 2 and also the supply direction of the fin material 3), along the divided part of the first lower mold 2A and the second lower mold 2B Thus, an air escape groove 4 is provided so as to pass through the two convex portions 22 and to exceed the width direction side end portion of the lower mold 2.
The width of the air escape groove 4 is set to be equal to or less than the thickness of the fin material 3.

  In addition, an air discharge path 5 is provided on the lower side of the division part, and the air supplied from the air supply part 6 is blown to the fin material 3 that has been molded through the air escape groove 4, and this fin material 3 is configured to be separated from the lower mold 2.

In the fin molding apparatus according to the first embodiment configured as described above, when the upper mold 1 is in the raised state, the plate-shaped fin material 3 includes the upper mold 1 and the lower mold 2. And is placed on the upper surface of the lower mold 2.
Although not shown, the fin material 3 is tensioned on the upstream side by a tension applying device, and the downstream side is positioned.

Thereafter, the upper mold 1 is lowered toward the lower mold 2, and the concave portion 11 and the convex portion 22 of the lower mold 2, and the convex portion 12 of the upper mold 1 and the lower die The ridges 31 and the valleys 32 of the fin material 3 are press-formed with the two recesses 21, respectively.
At the time of pressing, the air between the upper mold 1 and the lower mold 2 escapes from these sides, but a part of the air remains between the fin material 3 and the lower mold 2. Note that the residual air is between the fin material 3 and the lower mold 2 since the upper mold 1 is lowered and they are immediately contacted and pressed between the fin material 3 and the upper mold 1. It can be ignored compared to.

Air or processing oil remaining between the fin material 3 and the lower mold 2 passes through the air relief grooves 4 extending between the both ends of the lower mold 2 and enters the atmosphere from both ends of the lower mold 2. Is released.
Therefore, no dent is generated in the peak portion 31 and the valley portion 32 of the fin material 3, and the surfaces thereof are so-called flush surfaces, that is, smooth surfaces without unevenness.
The shaped fin material 3 is cut to a predetermined length on the downstream side to become an inner fin of the heat exchanger. In addition, you may make it perform the re-like of a fin material between these. Also in this case, the air escape groove 4 can be used.

As described above, the fin forming apparatus and the fin forming method of the first embodiment can obtain the following effects.
Since the air escape groove 4 is provided through the convex portion 22 of the lower mold 2 and beyond to the vicinity of the width direction end of the lower mold 2, the upper mold 1 and the lower mold 2 are provided. When the fin material 3 is press-molded, the air and processing oil that existed between them can be released into the atmosphere outside the mold through the air relief groove 4, and dents are generated in the fin material 3. Can be prevented.

Since the air escape groove 4 is provided between the ends of the lower mold 2, it is possible to guide residual air or the like to the atmosphere.
In addition, since the air escape groove 4 is formed in the split portion where the first lower mold 2A and the second lower mold 2b constituting the lower mold 2 are abutted, the processing of the air escape groove 4 is performed. Becomes easier. Furthermore, the division part can be used as an air flow path.

  By providing air supply part 6 and blowing air from the air escape groove 4 to the lower surface of the fin material 4, the fin material 3 that has been molded can be easily separated from the lower mold 2, and the fin material 3 It becomes easy to carry to the next process.

  As described above, the present invention has been described based on the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and even when there is a design change or the like without departing from the gist of the present invention, it is included in the present invention.

For example, the air escape groove 4 can be provided also on the upper mold 3.
In addition, the shape, number, and arrangement can be set as appropriate according to the use conditions, targets, and the like. For example, the right side, the left side, or both in the direction perpendicular to the supply direction of the fin material 3 may be used.

Alternatively, the upper mold 1 may be fixed and the lower mold 2 may be moved up and down. Or you may make it arrange | position a metal mold | die to the left and right instead of arrange | positioning up and down.
Further, the fin may be other than the inner fin.

1 Upper mold
11 Recess
12 Convex
13 Inclined part
2 Lower mold
2A First lower mold
2B Second lower mold
21 Convex
22 recess
23 Inclined part
3 Fin material
31 Yamabe
32 Tanibe
4 Air escape groove

Claims (7)

In a fin molding device that molds a corrugated fin used in a heat exchanger by sandwiching and pressing a plate-shaped fin material between a pair of molds,
At least one of the pair of molds is provided with an air escape groove extending in the supply direction of the fin material,
A fin forming apparatus. The fin forming apparatus according to claim 1,
The mold provided with the air escape groove is divided from each other in a direction perpendicular to the supply direction of the fin material along the air escape groove.
A fin forming apparatus. In the fin shaping | molding apparatus of Claim 1 or Claim 2,
The air escape groove is disposed on the side of the mold on the right side and / or the left side from the center in the direction perpendicular to the supply direction of the fin material.
A fin forming apparatus. In the fin shaping | molding apparatus of Claim 3,
The ends of the right and / or left side portions of the air escape groove perpendicular to the supply direction of the fin material are open to the atmosphere.
A fin forming apparatus. In the fin shaping | molding apparatus of any one of Claim 1 thru | or 4,
An air supply unit that blows air to the fin material through the air escape groove to separate the fin material from the mold;
A fin forming apparatus. The fin forming device according to any one of claims 1 to 5,
The fin is an inner fin,
A fin forming apparatus. In a fin molding method for molding a corrugated fin used in a heat exchanger by sandwiching and pressing a plate-shaped fin material between a pair of molds,
When the fin material is sandwiched and pressed between the pair of molds, air between the molds is removed from an air escape groove provided in at least one of the pair of molds and extending in the fin material supply direction. I let it escape to the outside of the mold,
A fin molding method.

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