WO2019102763A1

WO2019102763A1 - Tank for heat exchanger, and method for manufacturing tank for heat exchanger

Info

Publication number: WO2019102763A1
Application number: PCT/JP2018/039176
Authority: WO
Inventors: 賢治畑; 拓也三ツ橋; 周平山▲崎▼
Original assignee: 株式会社デンソー
Priority date: 2017-11-22
Filing date: 2018-10-22
Publication date: 2019-05-31
Also published as: DE112018005650B4; JP6926985B2; DE112018005650T5; JP2019095125A

Abstract

This method for manufacturing a tank for a heat exchanger comprises: a mounting step in which the tank body is mounted to a die (5) in which cavities (510, 511) corresponding to packing are formed; and an injection step in which a material for the packing is injected into the cavities of the die to integrally form the packing on the bottom surface of a flange section. The die has formed therein an overflow passage (512) which is in communication with the cavities corresponding to the packing and into which an excess portion (342) of the material for the packing flows. In the injection step, in order that a gap formed around the overflow passage is closed, the packing is formed integrally on the bottom surface of the flange section while the die is pressed against a seal member (317) having lower rigidity than the die.

Description

Heat exchanger tank and heat exchanger tank manufacturing method

Cross-reference to related applications

This application is based on Japanese Patent Application No. 2017-224679 filed on November 22, 2017, and claims the benefit of its priority, and the entire contents of the patent application are: Incorporated herein by reference.

The present disclosure relates to a heat exchanger tank and a method of manufacturing the heat exchanger tank.

Conventionally, there is a method for manufacturing a heat exchanger tank described in Patent Document 1 below. The heat exchanger described in Patent Document 1 includes a tank body having a flange portion at the outer edge of the opening, a core plate closing the opening of the tank body, and a packing for sealing between the flange portion of the tank body and the core plate. And have. The method of manufacturing a tank described in Patent Document 1 includes an assembling step of assembling a mold to a flange portion of a tank body, and injecting a material of packing to an outer peripheral side surface of the flange portion through an injection inlet of the mold. And an injection step of integrally molding the packing. In the injection step, the surplus portion of the packing material filled in the mold is discharged from the outer peripheral side of the flange portion through the injection outlet of the mold.

If the excess portion is intentionally formed in the packing as in this manufacturing method, the material of the packing is easily filled in the inside of the mold, so that it is difficult to form a recess or the like in the formed packing. Therefore, the sealability of the packing can be improved.

JP, 2016-196989, A

When using the manufacturing method of the tank as described in patent document 1, a mold may be divided | segmented and comprised, for example into two parts, a fixed type and a movable type, from the viewpoint of the productivity. When using a mold divided into two parts in this manner, the contact surface of the two divided molds may be located adjacent to the space in the mold where the packing material is filled. In such a case, the material of the packing enters into the gap between the contact surfaces of the two divided molds, which may cause the material of the packing to overflow and generate an extra portion, that is, a burr. When such burrs occur, after the packing is formed on the tank body, a step of removing the burrs is required separately. This causes the deterioration of the tank productivity, which in turn leads to a cost increase.

An object of the present disclosure is to provide a heat exchanger tank and a method of manufacturing the heat exchanger tank, which can improve productivity while securing the sealing function of the packing.

A method of manufacturing a tank of a heat exchanger according to one aspect of the present disclosure includes: a tank body having an opening closed by a core plate, and a flange formed at an outer edge of the opening and having the core plate assembled thereon; A method of manufacturing a heat exchanger tank having a packing integrally formed on the flange portion and sealing between the flange portion of the tank body and the core plate, wherein a mold having a cavity corresponding to the packing is formed. And an injection step of integrally forming the packing on the bottom of the flange portion by injecting the material of the packing into the cavity of the mold, and the mold corresponds to the packing. An overflow channel is formed in communication with the cavity and into which the surplus portion of the packing material flows, and in the injection process, the overflow As the gap is closed, which is formed around the over flow paths, while pressing the die to a lower sealing member rigidity than the die, integrally molded packing to the bottom surface of the flange portion.

According to this manufacturing method, when the surplus portion of the material of the packing flows into the overflow flow channel, the material of the packing does not easily flow in the gap formed around the overflow flow channel, so generation of burrs is suppressed. Can. Therefore, since the process of removing a burr becomes unnecessary, productivity can be improved. In addition, when the surplus portion of the material of the packing flows through the overflow flow path, the material of the packing is likely to be densely filled in the cavity of the mold, so that it is difficult to form a recess or the like in the packing. As a result, the sealing function of the packing can be secured.

In addition, the tank of the heat exchanger according to one aspect of the present disclosure includes a tank body having an opening closed by the core plate and a flange formed at the outer edge of the opening to which the core plate is assembled; A packing integrally formed in the portion to seal between the flange portion of the tank body and the core plate, the packing being a packing body portion provided on the bottom surface of the flange portion, and the outer periphery of the packing body portion to the flange portion The tank main body has a cutting surface at a portion adjacent to the cutting surface of the extending portion of the packing.

According to this configuration, when manufacturing the tank, the surplus portion cut at the cut surface of the tank body can be used as the sealing member. Therefore, even when a gap is formed in the mold, the gap in the mold can be closed by using the surplus portion of the tank body as the sealing member. This makes it difficult for the material of the packing to flow in the space between the molds, and therefore the generation of burrs can be suppressed. Therefore, the process of removing the burrs is unnecessary, and the productivity can be improved. Moreover, if it is a structure where a cut surface is formed in the extending | stretching part of packing, an excess part can be formed in packing at the time of manufacture of a tank. As a result, the material of the packing is likely to be densely filled in the mold used for molding the packing, so that it is difficult to form a recess or the like in the packing. As a result, the sealing function of the packing can be secured.

Furthermore, the tank of the heat exchanger according to one aspect of the present disclosure includes a tank body having an opening closed by the core plate, and a flange formed at the outer edge of the opening and assembled with the core plate; A packing integrally formed in the portion to seal between the flange portion of the tank body and the core plate, and the tank body penetrates the inside of the tank body from the bottom surface of the flange portion to the outer peripheral side surface of the flange portion Alternatively, a through hole extending to the upper surface is formed, and the packing extends from the packing main body to the outer peripheral side or upper surface of the flange from the packing main body through the through hole, and the outer peripheral side or upper surface of the flange And an extending portion having a cutting surface.

According to this configuration, the flange portion of the tank main body can be used as the seal member by pressing the mold against the flange portion of the tank main body during the manufacture of the tank. Therefore, even when a gap is formed in the mold, the gap in the mold can be closed by using the flange portion of the tank main body as a sealing member. This makes it difficult for the material of the packing to flow in the space between the molds, and therefore the generation of burrs can be suppressed. Therefore, the process of removing the burrs is unnecessary, and the productivity can be improved. Moreover, if it is a structure where the cut surface of packing is formed in the outer peripheral side surface or upper surface of packing, an excess part can be formed in packing at the time of manufacture of a tank. As a result, the material of the packing is likely to be densely filled in the mold used for molding the packing, so that it is difficult to form a recess or the like in the packing. As a result, the sealing function of the packing can be secured.

FIG. 1 is a block diagram showing a schematic configuration of the heat exchanger of the first embodiment. FIG. 2 is a cross-sectional view showing a cross-sectional structure taken along line II-II in FIG. FIG. 3 is a bottom view showing the bottom structure of the tank body of the first embodiment. FIG. 4 is a side view showing the side structure of the tank body of the first embodiment. FIG. 5 is a cross-sectional view showing an enlarged cross-sectional structure around the flange portion of the tank body of the first embodiment. FIG. 6 is a cross-sectional view showing a part of the process of manufacturing the tank according to the first embodiment. FIG. 7 is a cross sectional view showing a cross sectional structure taken along the line VII-VII in FIG. FIG. 8 is a cross-sectional view showing a part of the process of manufacturing a tank according to the first embodiment. FIG. 9 is a cross sectional view showing a cross sectional structure taken along line IX-IX in FIG. FIG. 10 is a cross-sectional view showing a cross-sectional structure of a primary molded product formed in the manufacturing process of the tank of the first embodiment. FIG. 11 is a cross sectional view showing a cross sectional structure along a line XI-XI in FIG. FIG. 12 is a cross-sectional view showing a cross-sectional structure of a secondary molded product molded in the manufacturing process of the tank of the first embodiment. FIG. 13 is a cross-sectional view showing a part of the process of manufacturing a tank according to a modification of the first embodiment. FIG. 14 is a cross-sectional view showing a part of the process of manufacturing a tank according to a modification of the first embodiment. FIG. 15 is a cross-sectional view showing a part of the process of manufacturing a tank according to the second embodiment. FIG. 16 is a cross-sectional view showing a cross-sectional structure of a primary molded product formed in the manufacturing process of the tank of the second embodiment. FIG. 17 is a cross-sectional view showing a cross-sectional structure of a secondary molded product formed in the process of manufacturing a tank according to the second embodiment. FIG. 18 is a cross-sectional view showing a part of the process of manufacturing a tank according to a modification of the second embodiment. FIG. 19 is a cross sectional view showing a cross sectional structure of a secondary molded product molded in a manufacturing process of a tank according to a modification of the second embodiment. FIG. 20 is a cross-sectional view showing a part of the process of manufacturing a tank according to another embodiment.

Hereinafter, embodiments of a heat exchanger tank and a method of manufacturing the heat exchanger tank will be described with reference to the drawings. In order to facilitate understanding of the description, the same constituent elements in the drawings are denoted by the same reference numerals as much as possible, and redundant description will be omitted.
First Embodiment
First, an overview of a tank and a heat exchanger using the method of manufacturing a tank according to the first embodiment will be described. The heat exchanger 1 shown in FIG. 1 is used, for example, as a vehicle heat exchanger for cooling a heat medium by performing heat exchange between the heat medium and air using the coolant of the internal combustion engine as the heat medium. It is.

As shown in FIG. 1, the heat exchanger 1 includes a core portion 2, a pair of

tanks

3 and 3, and a pair of

side plates

4 and 4.
The core portion 2 is composed of a tube 20 and fins 21. A plurality of tubes 20 are stacked with a gap in the direction indicated by arrow A in the drawing. The tube 20 is a flat tube having a longitudinal direction in the direction indicated by the arrow B in the figure, that is, the direction orthogonal to the direction indicated by the arrow A. Inside the tube 20, a flow path of the heat medium is formed in the direction indicated by the arrow B. Air flows between the

adjacent tubes

20 and 20 in the direction indicated by the arrow C in the figure, that is, in the direction orthogonal to both the direction indicated by the arrow A and the direction indicated by the arrow B.

Hereinafter, for the sake of convenience, the direction indicated by the arrow A is also referred to as “tube stacking direction A”. Moreover, the direction shown by arrow B is also called "the tube longitudinal direction B." Furthermore, the direction indicated by arrow C is also referred to as “air flow direction C”.
The fins 21 are disposed between the tubes 20 adjacent to each other in the tube stacking direction A. The fins 21 are so-called corrugated fins formed by bending a thin metal plate. The fins 21 are joined to the side surfaces of the

tubes

20, 20 adjacent to each other in the tube stacking direction A by brazing. The fins 21 have a function of promoting heat exchange between the heat medium flowing inside the tube 20 and the air by increasing the contact area with the air flowing between the

tubes

20, 20.

The pair of

tanks

3 and 3 are provided at both ends of the tube longitudinal direction B of the core 2 respectively. The pair of

tanks

3 and 3 are formed to extend in the tube stacking direction A, and are respectively connected to both ends of each tube 20. Hereinafter, the direction indicated by the arrow A is also referred to as “tank longitudinal direction A”. The tank 3 is composed of a core plate 30 connected to an end of the tube 20 and a tank body 31 which constitutes an internal flow path of the tank 3 together with the core plate 30. The internal flow passage of the tank 3 is in communication with the internal flow passage of the tube 20. One tank 3 is provided with an inlet 32. The inlet 32 is a portion for flowing the heat medium into the internal flow passage of one tank 3 as indicated by the arrow in the figure. The other tank 3 is provided with an outlet 33. The outlet 33 is a portion that causes the heat medium to flow out from the internal flow path of the other tank 3 as indicated by the arrow in the figure.

The pair of

side plates

4 and 4 are disposed at both ends of the core layer 2 in the tube stacking direction A, respectively. The pair of side plates 4 is formed to extend in the tube longitudinal direction B, and is connected to the pair of tanks 3. The pair of

side plates

4, 4 have a function of reinforcing the core 2.

In the heat exchanger 1, the heat medium flows from the inlet 32 of one tank 3 into the internal flow passage of the tank, whereby the heat medium is distributed to the tubes 20. The heat medium is cooled by heat exchange between the heat medium flowing inside the tube 20 and the air flowing outside the tube 20. The heat medium cooled by passing through the inside of the tube 20 is collected in the internal flow path of the other tank 3 and then discharged from the outlet 33.

Next, the structure of the tank 3 will be described in detail.
As shown in FIGS. 2 and 3, the cross-sectional shape orthogonal to the longitudinal direction A of the tank body 31 is formed in a U-shape. The tank body 31 is formed of, for example, a thermosetting resin. Both ends of the tank body 31 in the tank longitudinal direction A are closed.

As shown in FIG. 3, the tank body 31 is formed with a rectangular annular opening 310. As shown in FIGS. 2 and 3, a flange portion 311 is formed on the outer edge of the opening 310 of the tank body 31 over the entire circumference. That is, the flange portion 311 is also formed in a rectangular ring shape. The flange portion 311 has

long wall portions

312 and 313 parallel to the tank longitudinal direction A and

short wall portions

314 and 315 parallel to the air flow direction C.

As shown in FIG. 2, the packing 34 is integrally formed on the bottom surface 311 b of the flange portion 311. As shown in FIG. 3, the packing 34 is provided over the entire circumference of the flange portion 311. The packing 34 is made of, for example, rubber.
As shown in FIG. 2, the core plate 30 has a plate-like tube joint 300 extending in the tank longitudinal direction A, and an annular insert 301 formed on the entire periphery of the tube joint 300. Have. The core plate 30 is formed of, for example, an aluminum alloy.

The tube joint 300 is arranged to close the opening 310 of the tank body 31. In the core plate 30, a plurality of tube insertion holes (not shown) into which the tubes 20 are inserted are formed in line in the tank longitudinal direction A. The tube 20 is fixed to the core plate 30 by brazing.

The flange portion 311 of the tank body 31 is inserted into the insertion portion 301. The tank body 31 is fixed to the core plate 30 by the insertion portion 301 being crimped to the flange portion 311 of the tank body 31.
As shown in FIG. 4, a concave groove 316 is formed at the center of the short wall 314 of the flange 311. Although not shown, a similar concave groove 316 is formed in the center of the short wall 315 of the flange 311.

As shown in FIG. 5, the groove portion 316 extends from the bottom surface 311 b of the flange portion 311 toward a corner on the upper surface 311 d side. A stepped surface 311 g is formed between the upper end of the groove 316 and the corner of the flange 311.
The packing 34 has a packing main portion 340 provided on the bottom surface 311 b of the flange portion 311 and an extending portion 341 extending from the packing main portion 340 along the groove portions 316 of the short wall portion 314 of the flange portion 311. . The packing main body portion 340 is compressed between the flange portion 311 of the tank main body 31 and the core plate 30 so as to be elastically deformed, thereby sealing between them.

Next, a method of manufacturing the tank 3 will be described.
When manufacturing the tank 3, first, the tank body 31 is formed by resin molding such as injection molding. At this time, as shown in FIG. 6, an overflow portion 317 is formed in the tank body 31 so as to extend outward from the outer peripheral side surface 311 c. The overflow portion 317 is a portion formed of an excess material after filling the material into a portion necessary as a product at the time of injection molding. Therefore, the overflow portion 317 is also made of a thermosetting resin in the same manner as the tank body 31. In the present embodiment, the overflow portion 317 corresponds to the surplus portion of the tank body 31.

Thereafter, as shown in FIG. 6, an assembling step of assembling the tank body 31 to the mold 5 is performed. The mold 5 is composed of an upper mold 50 as a movable mold and a lower mold 51 as a fixed mold. In the assembling step, after the lower part of the tank body 31 is installed on the lower mold 51, the upper mold 50 is assembled from the upper part of the tank body 31. Thereby, as shown in FIG. 6, the flange portion 311 of the tank body 31 is sandwiched between the upper mold 50 and the lower mold 51.

In the lower mold 51, a first cavity 510 and a second cavity 511 for integrally molding the packing 34 in the tank body 31 and an overflow channel 512 are formed.
The first cavity 510 is a space corresponding to the packing main body 340, and is formed in a rectangular ring along the bottom surface 311 b of the flange 311. The second cavity 511 is a space corresponding to the extending portion 341, and is formed to extend from the first cavity 510 along the groove portion 316 of the short wall portion 314 of the flange portion 311.

The overflow channel 512 is formed to extend from the upper end portion of the second cavity 511 to the outside of the flange portion 311 of the tank body 31. As shown in FIG. 7, the overflow channel 512 is formed of a concave groove surrounded by the bottom wall 512a, the left side wall 512b, and the right side wall 512c. The overflow channel 512 is a portion into which the surplus portion of the material of the packing 34 flows through the second cavity 511 when the material of the packing 34 is injected into the first cavity 510.

An overflow portion 317 of the tank main body 31 is disposed between the upper mold 50 and a portion of the lower mold 51 where the overflow flow passage 512 is formed. The overflow portion 317 is sandwiched between the

upper surfaces

512 d and 512 e of the left side wall 512 b and the right side wall 512 c of the lower mold 51 and the bottom surface 500 of the upper mold 50. The upper mold 50 presses the overflow portion 317 of the tank body 31 toward the lower mold 51 with a force F. As a result, the overflow portion 317 of the tank body 31 is crushed and compressed, thereby closing the gap formed between the upper mold 50 and the lower mold 51. That is, the overflow portion 317 of the tank body 31 functions as a seal member for sealing between the upper mold 50 and the lower mold 51.

Although not shown, in the lower mold 51, a third cavity is similarly formed along the groove portion 316 of the short wall portion 315 of the flange portion 311. The third cavity is open at the outer surface of the lower mold 51.
Subsequent to the assembling step, an injection step of injecting a rubber material which is a raw material of the packing into the mold 5 is performed. In the injection process, a rubber material is injected from the opening of the third cavity of the lower mold 51 into the inside of the mold 5. That is, as shown by the arrow D in FIG. 3, the rubber material is injected toward the short wall portion 315 of the flange portion 311. The rubber material injected into the opening portion of the third cavity branches from the third cavity to the first cavity 510 to branch as indicated by arrows E1 and E2 in FIG. It flows along 311b. The rubber material that has flowed in the directions indicated by the arrows E1 and E2 flows toward the short wall portion 314 of the flange portion 311 and joins near the short wall portion 314 of the flange portion 311. The joined rubber material flows into the overflow channel 512 through the second cavity 511 of the lower mold 51. As a result, as shown in FIGS. 8 and 9, the inside of the mold 5 is filled with the rubber material. After such an injection process is performed, the packing 34 is integrally formed on the tank body 31 by cooling and curing the rubber material. Further, by curing the rubber material flowing into the overflow channel 512 of the lower mold 51, an overflow portion 342 is formed in the packing 34 so as to extend from the upper end portion of the extension portion 341 to the outside of the flange portion 311. Ru. In the present embodiment, the overflow portion 342 corresponds to the surplus portion of the packing 34. Thereafter, the integrally formed article of the tank body 31 and the packing 34 is removed from the mold 5 to complete the manufacture of the primary formed article 60 of the tank body 31 and the packing 34 as shown in FIGS. 10 and 11.

Thus, after the production of the primary molded product 60 is completed, a cutting step of cutting the excess portion is performed. Specifically, the primary molded product 60 is cut at a position indicated by a broken line L1 in FIG. As a result, the overflow portion 317 is cut off from the tank main body 31 and the overflow portion 317 is cut off from the packing 34. In the cutting step, the excess portion of the primary molded product 60 formed in the vicinity of the injection inlet of the mold 5 is similarly cut. Thus, the production of the secondary molded product 61 of the tank body 31 and the packing 34 as shown in FIG. 12 is completed. In the secondary molded product 61, the packing 34 has a cut surface 341a at the extending portion 341 thereof. In addition, the tank body 31 has a cut surface 311 h in a portion adjacent to the cut surface 341 a of the extension portion 341 of the packing 34. Thereafter, the core plate 30 is assembled to the secondary molded product 61 of the tank body 31 and the packing 34 to complete the manufacture of the tank 3.

According to the tank 3 of the heat exchanger 1 of the present embodiment described above and the method of manufacturing the same, it is possible to obtain the actions and effects shown in the following (1) to (3).
(1) In the injection step, the gap formed around the overflow channel 512 of the mold 5, specifically, the gap formed between the upper mold 50 and the lower mold 51 is closed so that the gold is closed. The packing 34 is integrally formed on the bottom surface 311 b of the tank main body 31 while pressing the mold 5 to the overflow portion 317 of the tank main body 31 whose rigidity is lower than that of the mold 5. According to such a manufacturing method, when the surplus portion of the rubber material which is the material of the packing 34 flows into the overflow channel 512, the rubber material is formed in the gap formed between the upper mold 50 and the lower mold 51. Since it becomes difficult to flow, generation of burrs can be suppressed. Therefore, since the process of removing a burr becomes unnecessary, productivity can be improved. In addition, when the surplus portion of the rubber material is caused to flow through the overflow flow channel 512, the rubber material is likely to be densely filled in the first cavity 510 of the mold 5, so that it is difficult to form a recess or the like in the packing 34. As a result, the sealing function of the packing 34 can be secured.

(2) The overflow portion 317 of the tank main body 31 is used as a seal member for sealing the gap between the upper mold 50 and the lower mold 51. As a result, it is not necessary to prepare a seal member separately, and productivity can be further improved.
(3) The packing 34 has a cut surface 341 a at the extension portion 341 thereof. In addition, the tank body 31 has a cut surface 311 h in a portion adjacent to the cut surface 341 a of the extension portion 341 of the packing 34. According to such a configuration, when manufacturing the tank 3, the overflow portion 317 cut at the cut surface 341 a of the tank main body 31 can be used as a seal member. Therefore, even when a gap is formed between the upper mold 50 and the lower mold 51, the gap can be closed by using the overflow portion 317 of the tank body 31 as a sealing member. As a result, the rubber material does not easily flow in the gap between the upper mold 50 and the lower mold 51, so that the generation of burrs can be suppressed. Therefore, the process of removing the burrs is unnecessary, and the productivity can be improved. In addition, when the cut surface 341 a is formed in the extension portion 341 of the packing 34, the overflow portion 342 can be formed in the packing 34 when the tank 3 is manufactured. As a result, the rubber material is likely to be densely filled in the

cavities

510 and 511 of the mold 5 used when molding the packing 34, and therefore, it is difficult to form a recess or the like in the packing 34. As a result, the sealing function of the packing 34 can be secured.

(Modification)
Next, a modification of the tank 3 of the heat exchanger 1 of the first embodiment and a method of manufacturing the same will be described.
As shown in FIG. 13, in the method of manufacturing the tank 3 of the present modification, the overflow portion 317 of the tank body 31 is divided into two

overflow pieces

317a and 317b. During the injection process, one overflow piece 317 a is sandwiched between the upper surface 512 d of the left side wall 512 b of the lower mold 51 and the bottom surface 500 of the upper mold 50. The other overflow piece 317 b is sandwiched between the upper surface 512 e of the right side wall 512 c of the lower mold 51 and the bottom surface 500 of the upper mold 50.

As described above, if the overflow portion 317 is divided into two

overflow pieces

317a and 317b, the overflow portion 317 and the upper portion are superior to the case of using the undivided overflow portion 317 as in the first embodiment. The contact area with the mold 50 can be reduced. Thereby, when the force F is applied to the upper die 50, the pressure applied to the contact surfaces of the

overflow pieces

317a and 317b and the upper die 50 and the pressure applied to the contact surfaces of the

overflow pieces

317a and 317b and the lower die 51 are increased. be able to. That is, even when the same force F is applied to the upper mold 50, the overflow portion 317 can be crushed more largely in the present modification. As a result, since the sealing function of the overflow portion 317 can be enhanced, the generation of the burr can be more accurately suppressed.

In addition, as shown in FIG. 14, even when the overflow portion 317 of the tank main body 31 is formed in a concave shape in cross section, it is possible to obtain the same effect.
Second Embodiment
Next, a second embodiment of the tank 3 of the heat exchanger 1 and a method of manufacturing the same will be described. Hereinafter, differences between the tank 3 of the heat exchanger 1 of the first embodiment and the method of manufacturing the same will be mainly described.

As shown in FIG. 15, the flange portion 311 of the tank body 31 of the present embodiment is formed with a through hole 318 penetrating from the bottom surface 311b to the top surface 311d. In the upper mold 50, an overflow channel 501 is formed to communicate with the through hole 318.
Next, the manufacturing method of the tank 3 of this embodiment is demonstrated.

In the manufacturing method of the tank 3 of the present embodiment, the upper mold 50 is pressed by the force F against the upper surface 311 d of the flange portion 311 of the tank main body 31 in the injection step. As a result, the flange portion 311 of the tank body 31 is crushed, whereby the gap formed between the bottom surface 500 of the upper mold 50 and the flange portion 311 of the tank body 31 is closed.

When the rubber material is injected into the mold 5 in the injection step, the rubber material flowing in the first cavity 510 of the lower mold 51 flows into the overflow channel 501 of the upper mold 50 through the through hole 318 of the flange portion 311 of the tank body 31. . Thereby, the inside of the mold 5 is filled with the rubber material. After such an injection process is performed, the packing 34 is integrally formed on the tank body 31 by cooling and curing the rubber material. Further, by curing the rubber material flowing into the overflow flow channel 501 of the upper mold 50, an overflow portion 344 extending upward from the upper surface 311d of the flange portion 311 of the tank main body 31 is formed in the packing 34. Thereafter, the integrally formed article of the tank body 31 and the packing 34 is removed from the mold 5, and the manufacture of the primary formed article 60 of the tank body 31 and the packing 34 as shown in FIG. 16 is completed.

Thereafter, in the cutting process, the primary molded product 60 is cut at a position indicated by a broken line L2 in FIG. As a result, the overflow portion 344 is cut from the packing 34, and the manufacture of the secondary molded product 61 of the tank body 31 and the packing 34 as shown in FIG. 17 is completed. In the secondary molded product 61 of the tank body 31 and the packing 34, the packing 34 has an extending portion 343 extending from the packing body portion 340 through the through hole 318 to the upper surface 311 d of the flange portion 311 of the tank body 31. The extending portion 343 has a cutting surface 343 a on the upper surface 311 d of the flange portion 311.

Thus, after the production of the secondary molded product 61 of the tank body 31 and the packing 34 is completed, the core plate 30 is assembled to the secondary molded product 61 to complete the production of the tank 3.
According to the tank 3 of the heat exchanger 1 of the present embodiment described above and the method of manufacturing the same, it is possible to obtain the actions and effects shown in the following (4) to (6).

(4) In the injection step, the gap formed around the overflow channel 501 of the mold 5, specifically, the gap formed between the upper mold 50 and the flange portion 311 of the tank body 31, is closed. As described above, the packing 34 is integrally formed on the bottom surface 311 b of the tank main body 31 while pressing the mold 5 to the flange portion 311 of the tank main body 31 whose rigidity is lower than that of the mold 5. According to such a manufacturing method, a gap formed between the upper mold 50 and the flange portion 311 of the tank main body 31 when the surplus portion of the rubber material which is the material of the packing 34 flows into the overflow channel 501. In addition, since the rubber material hardly flows, the generation of burrs can be suppressed. Therefore, since the process of removing a burr becomes unnecessary, productivity can be improved. In addition, when the surplus portion of the rubber material is caused to flow through the overflow flow channel 501, the rubber material is likely to be densely filled in the first cavity 510 of the mold 5, so that it becomes difficult to form a recess or the like in the packing 34. As a result, the sealing function of the packing 34 can be secured. Further, since the packing main body 340 can be uniformly formed into a substantially semi-elliptical cross section, the sealing performance can be stabilized.

(5) The flange portion 311 of the tank main body 31 is used as a seal member for sealing the gap between the upper mold 50 and the flange portion 311 of the tank main body 31. As a result, it is not necessary to prepare a seal member separately, and productivity can be further improved.
(6) The packing 34 has an extending portion 343 extending from the packing main portion 340 to the upper surface 311 d through the through hole 318 of the flange portion 311 of the tank main body 31. The extending portion 343 has a cutting surface 343 a on the upper surface 311 d of the flange portion 311 of the tank main body 31. According to such a configuration, when manufacturing the tank 3, the flange portion 311 of the tank main body 31 can be used as a seal member. Specifically, even when a gap is formed between the upper mold 50 and the flange portion 311 of the tank main body 31, the gap is closed by using the flange portion 311 of the tank main body 31 as a seal member. be able to. As a result, the rubber material does not easily flow in the gap between the upper die 50 and the flange portion 311 of the tank main body 31, so that the generation of burrs can be suppressed. Therefore, since the process of removing a burr becomes unnecessary, productivity can be improved. In addition, when the cut surface 343 a is formed in the extension portion 343 of the packing 34, the overflow portion 344 can be formed in the packing 34 when the tank 3 is manufactured. As a result, the rubber material is likely to be densely filled in the first cavity 510 of the mold 5 used when molding the packing 34, so that it is difficult to form a recess or the like in the packing 34. As a result, the sealing function of the packing 34 can be secured.

(Modification)
Next, the tank 3 of the heat exchanger 1 of 2nd Embodiment and the modification of the manufacturing method are demonstrated.
As shown in FIG. 18, in the flange portion 311 of the tank body 31 of the present modification, a through hole 318 is formed to penetrate from the bottom surface 311 b to the outer peripheral side surface 311 c. In the upper mold 50, an overflow channel 502 is formed to communicate with the through hole 318.

In the manufacturing method of the tank 3 of the present embodiment, the upper mold 50 is pressed by the force F against the outer peripheral side surface 311 c of the flange portion 311 of the tank main body 31 in the injection step. Thus, the flange portion 311 of the tank body 31 is crushed, whereby the gap formed between the upper mold 50 and the flange portion 311 of the tank body 31 is closed.

In the method of manufacturing the tank 3 of the present modification, as shown in FIG. 19, when the production of the secondary molded product 61 of the tank body 31 and the packing 34 is completed, the packing 34 passes through the through hole from the packing body 340 An extending portion 343 extends to the outer peripheral side surface 311 c of the flange portion 311 of the tank main body 31 through 318. The extending portion 343 has a cutting surface 343 a on the outer peripheral side surface 311 c of the flange portion 311.

Even with the tank 3 of the heat exchanger 1 and the method of manufacturing the same, the same operation and effects as the tank 3 of the heat exchanger 1 of the second embodiment and the method of manufacturing the same can be obtained.
Other Embodiments
In addition, the said embodiment can also be implemented with the following forms.

As shown in FIG. 20, the seal member 70 is provided between the left side wall 512 b of the lower mold 51 and the bottom surface 500 of the upper mold 50, and the right side wall 512 c of the lower mold 51 and the bottom surface 500 of the upper mold 50. Between the upper mold 50 and the lower mold 51 may be closed by the

seal members

70, 71. As shown in FIG. Even with such a manufacturing method, the rubber material does not easily flow in the gap formed between the upper mold 50 and the lower mold 51, so that the generation of burrs can be suppressed.

The materials of the tank body 31 and the packing 34 can be arbitrarily changed.
The present disclosure is not limited to the above specific example. Those skilled in the art may appropriately modify the above-described specific example as long as the features of the present disclosure are included. The elements included in the specific examples described above, and the arrangement, conditions, shape, and the like of the elements are not limited to those illustrated, and can be changed as appropriate. The elements included in the above-described specific examples can be appropriately changed in combination as long as no technical contradiction arises.

Claims

An opening (310) closed by a core plate (30), and a tank body (31) having a flange (311) formed on the outer edge of the opening and to which the core plate is assembled;
A tank (3) of a heat exchanger (1) having a packing (34) integrally formed on the flange portion of the tank body and sealing between the flange portion of the tank body and the core plate A manufacturing method,
Assembling the tank body to a mold (5) in which cavities (510, 511) corresponding to the packing are formed;
And an injection step of integrally forming the packing on the bottom surface (311b) of the flange portion by injecting the material of the packing into the cavity of the mold;
The mold is formed with an overflow channel (501, 502, 512) which is communicated with the cavity corresponding to the packing and into which the surplus portion (342, 344) of the material of the packing flows.
In the injection step, the mold is pressed against the seal member (70, 71, 311, 317), which is lower in rigidity than the mold, so that a gap formed around the overflow channel is closed. A method of manufacturing a heat exchanger tank, wherein a packing is integrally formed on the bottom surface of the flange portion.
An excess portion (317) is formed in the tank body so as to extend to the overflow channel,
The method according to claim 1, wherein an excess portion of the tank body is used as the sealing member.
The method for manufacturing a heat exchanger tank according to claim 2, wherein the surplus portion of the tank body is divided into a plurality of portions (317a, 317b).
The manufacturing method of the tank of the heat exchanger according to claim 1, wherein a flange portion (311) of the tank body is used as the seal member.
The method according to claim 1, wherein a member (70, 71) different from the tank body and the packing is used as the seal member.
An opening (310) closed by a core plate (30), and a tank body (31) having a flange (311) formed on the outer edge of the opening and to which the core plate is assembled;
A packing (34) integrally formed on the flange portion of the tank body to seal between the flange portion of the tank body and the core plate;
The packing is
A packing main body (340) provided on the bottom of the flange;
An extending portion (341) extending from the packing main portion along the outer peripheral side surface (311c) of the flange portion and in which a cut surface (341a) is formed;
The tank body is
A heat exchanger tank having a cut surface (311h) in a portion adjacent to the cut surface of the extension portion of the packing.
An opening (310) closed by a core plate (30), and a tank body (31) having a flange (311) formed on the outer edge of the opening and to which the core plate is assembled;
A packing (34) integrally formed on the flange portion of the tank body to seal between the flange portion of the tank body and the core plate;
The tank body is
A through hole (318) extending from the bottom surface (311b) of the flange portion to the outer peripheral side surface (311c) or the upper surface (311d) of the flange portion is formed through the inside of the tank body.
The packing is
A packing main body (340) provided on the bottom of the flange;
An extending portion (343) extending from the packing main body portion to the outer peripheral side surface or upper surface of the flange portion through the through hole, and having a cutting surface (343a) on the outer peripheral side surface or upper surface of the flange portion; tank.