JP6926985B2 - How to manufacture heat exchanger tanks and heat exchanger tanks - Google Patents

Description

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

Conventionally, there is a method for manufacturing a tank of a heat exchanger described in Patent Document 1 below. The heat exchanger described in Patent Document 1 has a tank body having a flange on the outer edge of the opening, a core plate that closes the opening of the tank body, and a packing that seals between the flange and the core plate of the tank body. And have. The method for 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 a bottom surface of the flange portion by injecting a packing material into an outer peripheral side surface of the flange portion through an injection inlet of the mold. It is equipped with an injection process for integrally molding the packing. In the injection process, the excess portion of the packing material filled in the mold is discharged from the outer peripheral side surface of the flange portion through the injection outlet of the mold.

If the excess portion is intentionally molded in the packing as in this manufacturing method, it becomes easy to fill the inside of the mold with the packing material, so that it becomes difficult for a dent or the like to be formed in the packing after molding. Therefore, the sealing property of the packing can be improved.

Japanese Unexamined Patent Publication No. 2016-196989

By the way, when the method for manufacturing a tank as described in Patent Document 1 is used, the mold may be divided into two parts, for example, a fixed mold and a movable mold, from the viewpoint of productivity. .. When the mold divided into two portions is used in this way, the contact surface of the two divided molds may be located adjacent to the space in which the packing material is filled in the mold. In such a case, the packing material may enter the gap between the contact surfaces of the two divided molds, so that an extra portion formed by the packing material protruding, that is, burrs may be generated. When such burrs occur, a separate step of removing burrs is required after molding the packing on the tank body. This led to a deterioration in tank productivity, which in turn led to an increase in costs.

The present disclosure has been made in view of these circumstances, and an object thereof is to manufacture a heat exchanger tank and a heat exchanger tank capable of improving productivity while ensuring the packing sealing function. To provide a method.

In order to solve the above problems, a tank body (31) having an opening (310) closed by the core plate (30) and a flange portion (311) formed on the outer edge of the opening and to which the core plate is assembled. The method for manufacturing the tank (3) of the heat exchanger (1), which is integrally formed with the flange portion of the tank body and has a packing (34) for sealing between the flange portion of the tank body and the core plate, is described. The assembly process of assembling the tank body to the mold (5) in which the cavities (510, 511) corresponding to the packing are formed, and the packing is integrated on the bottom surface of the flange by injecting the packing material into the cavity of the mold. An overflow flow path (512, 501, 502) is formed in the mold, which is communicated with a cavity corresponding to the packing and into which a surplus portion (342, 344) of the packing material flows. In the injection process, the flange portion is pressed against the sealing member (70, 71, 311, 317) having a lower rigidity than the mold so that the gap formed around the overflow flow path is closed. The packing is integrally molded on the bottom surface of the. A surplus portion (317) is formed in the tank body so as to extend into the overflow flow path. The surplus portion of the tank body is used as the sealing member.

According to this manufacturing method, when the excess portion of the packing material flows into the overflow flow path, the packing material becomes difficult to flow into the gap formed around the overflow flow path, so that the generation of burrs is suppressed. Can be done. Therefore, the step of removing burrs becomes unnecessary, and the productivity can be improved. Further, by flowing the excess portion of the packing material through the overflow flow path, the packing material is likely to be densely filled in the cavity of the mold, so that dents and the like are less likely to be formed in the packing. As a result, the sealing function of the packing can be ensured.

Further, the tank (3) of the heat exchanger (1) for solving the above problems has an opening (310) closed by the core plate (30) and a flange formed on the outer edge of the opening to which the core plate is assembled. A tank body (31) having a portion (311) and a packing (34) integrally formed with the flange portion of the tank body to seal between the flange portion of the tank body and the core plate are provided, and the packing comprises. A packing main body portion (340) provided on the bottom surface of the flange portion and an extended portion (341) extending from the packing main body portion along the outer peripheral side surface (311c) of the flange portion and forming a cut surface (341a). The tank body has a cut surface (311 h) in a portion adjacent to the cut surface of the stretched portion of the packing.

According to this configuration, when the tank is manufactured, 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 a sealing member. This makes it difficult for the packing material to flow into the gaps between the molds, so that the occurrence of burrs can be suppressed. Therefore, the step of removing burrs becomes unnecessary, and the productivity can be improved. Further, if the structure is such that a cut surface is formed in the stretched portion of the packing, a surplus portion can be formed in the packing at the time of manufacturing the tank. This makes it easier for the packing material to be densely filled inside the mold used when molding the packing, so that dents and the like are less likely to be formed in the packing. As a result, the sealing function of the packing can be ensured.

Further, the tank (3) of the heat exchanger (1) for solving the above problems has an opening (310) closed by the core plate (30) and a flange formed on the outer edge of the opening to which the core plate is assembled. The tank body is provided with a tank body (31) having a portion (311) and a packing (34) integrally formed with the flange portion of the tank body to seal between the flange portion of the tank body and the core plate. Is formed with 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 through the inside of the tank body, and the packing is provided on the bottom surface of the flange portion. A packing main body portion (340) provided, and an extended portion (343) extending from the packing main body portion through a through hole to the outer peripheral side surface or upper surface of the flange portion and having a cut surface (343a) on the outer peripheral side surface or upper surface of the flange portion. To be equipped.

According to this configuration, the flange portion of the tank body can be used as a sealing member by pressing the mold against the flange portion of the tank 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 body as a sealing member. This makes it difficult for the packing material to flow into the gaps between the molds, so that the occurrence of burrs can be suppressed. Therefore, the step of removing burrs becomes unnecessary, and the productivity can be improved. Further, if the structure is such that the cut surface of the packing is formed on the outer peripheral side surface or the upper surface of the packing, a surplus portion can be formed on the packing at the time of manufacturing the tank. This makes it easier for the packing material to be densely filled inside the mold used when molding the packing, so that dents and the like are less likely to be formed in the packing. As a result, the sealing function of the packing can be ensured.

The reference numerals in parentheses described in the above means and claims are examples showing the correspondence with the specific means described in the embodiments described later.

According to the present disclosure, it is possible to provide a heat exchanger tank and a method for manufacturing a heat exchanger tank, which can improve productivity while ensuring a packing sealing function.

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 the line II-II of 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 manufacturing process of the tank of the first embodiment. FIG. 7 is a cross-sectional view showing a cross-sectional structure along the line VII-VII of FIG. FIG. 8 is a cross-sectional view showing a part of the manufacturing process of the tank of the first embodiment. FIG. 9 is a cross-sectional view showing a cross-sectional structure taken along the line IX-IX of FIG. FIG. 10 is a cross-sectional view showing a cross-sectional structure of a primary molded product formed in the tank manufacturing process of the first embodiment. FIG. 11 is a cross-sectional view showing a cross-sectional structure taken along the line XI-XI of FIG. FIG. 12 is a cross-sectional view showing a cross-sectional structure of a secondary molded product molded in the tank manufacturing process of the first embodiment. FIG. 13 is a cross-sectional view showing a part of the manufacturing process of the tank of the modified example of the first embodiment. FIG. 14 is a cross-sectional view showing a part of the manufacturing process of the tank of the modified example of the first embodiment. FIG. 15 is a cross-sectional view showing a part of the manufacturing process of the tank of the second embodiment. FIG. 16 is a cross-sectional view showing a cross-sectional structure of a primary molded product formed in the tank manufacturing process of the second embodiment. FIG. 17 is a cross-sectional view showing a cross-sectional structure of a secondary molded product molded in the tank manufacturing process of the second embodiment. FIG. 18 is a cross-sectional view showing a part of the manufacturing process of the tank of the modified example of the second embodiment. FIG. 19 is a cross-sectional view showing a cross-sectional structure of a secondary molded product formed in the tank manufacturing process of the modified example of the second embodiment. FIG. 20 is a cross-sectional view showing a part of the manufacturing process of the tank of another embodiment.

Hereinafter, embodiments of a heat exchanger tank and a method for manufacturing a heat exchanger tank will be described with reference to the drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as much as possible in each drawing, and duplicate description is omitted.
<First Embodiment>
First, the outline of the tank and the heat exchanger in which the method for manufacturing the tank of the first embodiment is used will be described. The heat exchanger 1 shown in FIG. 1 is used as, for example, a vehicle heat exchanger that cools a heat medium by exchanging heat between the heat medium and air using the cooling water of an internal combustion engine as a heat medium. 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 laminated with a gap in the direction indicated by the arrow A in the figure. The tube 20 is a flat tube having a longitudinal direction in the direction indicated by the arrow B in the drawing, that is, a direction orthogonal to the direction indicated by the arrow A. Inside the tube 20, a flow path through which the heat medium flows is formed in the direction indicated by the arrow B. Air flows between the adjacent tubes 20 and 20 in a direction orthogonal to both the direction indicated by the arrow C in the drawing, that is, the direction indicated by the arrow A and the direction indicated by the arrow B.

Hereinafter, for convenience, the direction indicated by the arrow A is also referred to as “tube stacking direction A”. Further, the direction indicated by the arrow B is also referred to as "tube longitudinal direction B". Further, the direction indicated by the arrow C is also referred to as "air flow direction C".
The fins 21 are arranged between the tubes 20 and 20 adjacent to the tube stacking direction A. The fin 21 is a so-called corrugated fin formed by bending a thin metal plate. The fins 21 are joined to the side surfaces of the tubes 20 and 20 adjacent to the tube stacking direction A by brazing. The fin 21 has 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 and 20.

The pair of tanks 3 and 3 are provided at both ends of the core portion 2 in the tube longitudinal direction B, respectively. The pair of tanks 3 and 3 are formed so as to extend in the tube stacking direction A, and are 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 the end of the tube 20 and a tank body 31 forming an internal flow path of the tank 3 together with the core plate 30. The internal flow path of the tank 3 communicates with the internal flow path of the tube 20. One tank 3 is provided with an inflow port 32. The inflow port 32 is a portion through which the heat medium flows into the internal flow path of one of the tanks 3 as shown by an arrow in the figure. The other tank 3 is provided with an outlet 33. The outlet 33 is a portion through which the heat medium flows out from the internal flow path of the other tank 3 as shown by an arrow in the figure.

The pair of side plates 4 and 4 are arranged at both ends of the core portion 2 in the tube stacking direction A, respectively. The pair of side plates 4 and 4 are formed so as to extend in the longitudinal direction B of the tube, and are connected to the pair of tanks 3 and 3. The pair of side plates 4 and 4 have a function of reinforcing the core portion 2.

In the heat exchanger 1, the heat medium flows into the internal flow path of the tank from the inflow port 32 of one of the tanks 3, so that the heat medium is distributed to each tube 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 of the tank body 31 orthogonal to the longitudinal direction A is formed in a U shape. The tank body 31 is made 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 annular shape. The flange portion 311 has a long wall portion 312, 313 parallel to the tank longitudinal direction A and a short wall portion 314, 315 parallel to the air flow direction C.

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

The tube joint 300 is arranged so as to close the opening 310 of the tank body 31. A plurality of tube insertion holes (not shown) into which the tube 20 is inserted are formed in the core plate 30 side by side 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 crimping the insertion portion 301 to the flange portion 311 of the tank body 31.
As shown in FIG. 4, a concave groove portion 316 is formed in the central portion of the short wall portion 314 of the flange portion 311. Further, although not shown, a similar concave groove portion 316 is formed in the central portion of the short wall portion 315 of the flange portion 311.

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

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

After that, 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 die 51, the upper die 50 is assembled from the upper part of the tank body 31. As a result, as shown in FIG. 6, the flange portion 311 of the tank body 31 is sandwiched between the upper die 50 and the lower die 51.

The lower mold 51 is formed with a first cavity 510 and a second cavity 511 for integrally molding the packing 34 in the tank body 31, and an overflow flow path 512.
The first cavity 510 is a space corresponding to the packing main body portion 340, and is formed in a rectangular ring shape along the bottom surface 311b of the flange portion 311. The second cavity 511 is a space corresponding to the extending portion 341, and is formed so as 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 flow path 512 is formed so as to extend from the upper end portion of the second cavity 511 toward the outside of the flange portion 311 of the tank body 31. As shown in FIG. 7, the overflow flow path 512 is composed of a concave groove surrounded by a bottom wall portion 512a, a left side wall portion 512b, and a right side wall portion 512c. The overflow flow path 512 is a portion where the excess 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.

The overflow portion 317 of the tank body 31 is arranged between the portion of the lower mold 51 where the overflow flow path 512 is formed and the upper mold 50. The overflow portion 317 is sandwiched between the upper surfaces 512d and 512e of the left side wall portion 512b and the right side wall portion 512c of the lower mold 51 and the bottom surface 500 of the upper mold 50, respectively. 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 and deformed, thereby closing the gap formed between the upper die 50 and the lower die 51. That is, the overflow portion 317 of the tank body 31 functions as a sealing member that seals between the upper mold 50 and the lower mold 51.

Although not shown, the lower mold 51 is similarly formed with a third cavity along the groove 316 of the short wall portion 315 of the flange portion 311. The third cavity is open to the outer surface of the lower mold 51.
Following the assembly step, an injection step of injecting the rubber material, which is the packing material, into the mold 5 is performed. In the injection step, the rubber material is injected into the mold 5 from the opening portion of the third cavity of the lower mold 51. 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 flows from the third cavity to the first cavity 510 to branch as shown by arrows E1 and E2 in FIG. 3, and the bottom surface of the flange portion 311. It flows along 311b. The rubber materials flowing in the directions indicated by the arrows E1 and E2 flow toward the short wall portion 314 of the flange portion 311 and merge in the vicinity of the short wall portion 314 of the flange portion 311. The merged rubber material flows into the overflow flow path 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 step is performed, the packing 34 is integrally molded with the tank body 31 by cooling and curing the rubber material. Further, as the rubber material that has flowed into the overflow flow path 512 of the lower mold 51 is cured, the packing 34 is formed with an overflow portion 342 so as to extend from the upper end portion of the stretched portion 341 toward the outside of the flange portion 311. NS. In the present embodiment, the overflow portion 342 corresponds to the surplus portion of the packing 34. After that, the integrally molded product of the tank body 31 and the packing 34 is removed from the mold 5, so that the production of the primary molded product 60 of the tank body 31 and the packing 34 as shown in FIGS. 10 and 11 is completed.

After the production of the primary molded product 60 is completed in this way, a cutting step of cutting the excess portion is performed. Specifically, the primary molded product 60 is cut at the position indicated by the broken line L1 in FIG. As a result, the overflow portion 317 is cut from the tank main body 31, and the overflow portion 317 is cut from the packing 34. In the cutting step, the excess portion of the primary molded product 60 formed near the injection inlet of the mold 5 is also cut in the same manner. As described above, 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 on the stretched portion 341 thereof. Further, the tank main body 31 has a cut surface 311h at a portion adjacent to the cut surface 341a of the stretched portion 341 of the packing 34. After that, the production of the tank 3 is completed by assembling the core plate 30 to the secondary molded product 61 of the tank body 31 and the packing 34.

According to the tank 3 of the heat exchanger 1 and the method for manufacturing the heat exchanger 1 of the present embodiment described above, the actions and effects shown in the following (1) to (3) can be obtained.
(1) In the injection step, the metal is closed so that the gap formed around the overflow flow path 512 of the mold 5, specifically, the gap formed between the upper mold 50 and the lower mold 51 is closed. While pressing the mold 5 against the overflow portion 317 of the tank body 31 having a lower rigidity than the mold 5, the packing 34 is integrally molded on the bottom surface 311b of the tank body 31. According to such a manufacturing method, when the excess portion of the rubber material which is the material of the packing 34 flows into the overflow flow path 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, the occurrence of burrs can be suppressed. Therefore, the step of removing burrs becomes unnecessary, and the productivity can be improved. Further, by flowing the excess portion of the rubber material into the overflow flow path 512, the rubber material is easily filled in the first cavity 510 of the mold 5, so that the packing 34 is less likely to have a dent or the like. As a result, the sealing function of the packing 34 can be ensured.

(2) It was decided to use the overflow portion 317 of the tank body 31 as a sealing member for sealing the gap between the upper mold 50 and the lower mold 51. As a result, it is not necessary to separately prepare a seal member, so that the productivity can be further improved.
(3) The packing 34 has a cut surface 341a on its stretched portion 341. Further, the tank main body 31 has a cut surface 311h at a portion adjacent to the cut surface 341a of the stretched portion 341 of the packing 34. According to such a configuration, when the tank 3 is manufactured, the overflow portion 317 cut at the cut surface 341a of the tank main body 31 can be used as a sealing member. Therefore, even when a gap is formed between the upper mold 50 and the lower mold 51, this gap can be closed by using the overflow portion 317 of the tank body 31 as a sealing member. This makes it difficult for the rubber material to flow into the gap between the upper mold 50 and the lower mold 51, so that the occurrence of burrs can be suppressed. Therefore, the step of removing burrs becomes unnecessary, and the productivity can be improved. Further, if the cut surface 341a is formed on the stretched portion 341 of the packing 34, the overflow portion 342 can be formed on the packing 34 at the time of manufacturing the tank 3. 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, so that dents and the like are less likely to be formed in the packing 34. As a result, the sealing function of the packing 34 can be ensured.

(Modification example)
Next, a modified example of the tank 3 of the heat exchanger 1 of the first embodiment and the manufacturing method thereof 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 317a is sandwiched between the upper surface 512d of the left wall portion 512b of the lower mold 51 and the bottom surface 500 of the upper mold 50. The other overflow piece 317b is sandwiched between the upper surface 512e of the right side wall portion 512c of the lower mold 51 and the bottom surface 500 of the upper mold 50.

If the overflow portion 317 is divided into two overflow pieces 317a and 317b in this way, the overflow portion 317 and the top are higher than the case where the undivided overflow portion 317 is used as in the first embodiment. The contact area with the mold 50 can be reduced. As a result, when a force F is applied to the upper mold 50, the pressure applied to the contact surfaces of the overflow pieces 317a, 317b and the upper mold 50, and the pressure applied to the contact surfaces of the overflow pieces 317a, 317b and the lower mold 51 are increased. be able to. That is, even when the same force F is applied to the upper die 50, the overflow portion 317 can be crushed more greatly in this modified example. As a result, the sealing function of the overflow portion 317 can be enhanced, so that the occurrence of burrs can be suppressed more accurately.

As shown in FIG. 14, the same effect can be obtained even when the overflow portion 317 of the tank body 31 is formed in a concave cross section.
<Second Embodiment>
Next, the tank 3 of the heat exchanger 1 and the second embodiment of the manufacturing method thereof will be described. Hereinafter, the differences between the tank 3 of the heat exchanger 1 of the first embodiment and the manufacturing method thereof 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. The upper die 50 is formed with an overflow flow path 501 so as to communicate with the through hole 318.
Next, a method of manufacturing the tank 3 of the present embodiment will be described.

In the method for manufacturing the tank 3 of the present embodiment, the upper mold 50 is pressed by a force F against the upper surface 311d of the flange portion 311 of the tank body 31 during the injection process. As a result, the flange portion 311 of the tank body 31 is crushed, so that the gap formed between the bottom surface 500 of the upper die 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 process, the rubber material flowing through the first cavity 510 of the lower mold 51 flows into the overflow flow path 501 of the upper mold 50 through the through hole 318 of the flange portion 311 of the tank body 31. .. As a result, the inside of the mold 5 is filled with the rubber material. After such an injection step is performed, the packing 34 is integrally molded with the tank body 31 by cooling and curing the rubber material. Further, as the rubber material flowing through the overflow flow path 501 of the upper die 50 is cured, the packing 34 is formed with an overflow portion 344 extending upward from the upper surface 311d of the flange portion 311 of the tank body 31. After that, the integrally molded product of the tank body 31 and the packing 34 is removed from the mold 5, so that the production of the primary molded product 60 of the tank body 31 and the packing 34 as shown in FIG. 16 is completed.

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

After the production of the secondary molded product 61 of the tank body 31 and the packing 34 is completed in this way, the production of the tank 3 is completed by assembling the core plate 30 to the secondary molded product 61.
According to the tank 3 of the heat exchanger 1 and the method for manufacturing the heat exchanger 1 of the present embodiment described above, the actions and effects shown in the following (4) to (6) can be obtained.

(4) In the injection step, the gap formed around the overflow flow path 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 311b of the tank body 31 while pressing the mold 5 against the flange portion 311 of the tank body 31 having a rigidity lower than that of the mold 5. According to such a manufacturing method, a gap formed between the upper die 50 and the flange portion 311 of the tank body 31 when the excess portion of the rubber material, which is the material of the packing 34, flows into the overflow flow path 501. Since the rubber material does not easily flow, the occurrence of burrs can be suppressed. Therefore, the step of removing burrs becomes unnecessary, and the productivity can be improved. Further, by flowing the excess portion of the rubber material into the overflow flow path 501, the rubber material is likely to be densely filled in the first cavity 510 of the mold 5, so that the packing 34 is less likely to have a dent or the like. As a result, the sealing function of the packing 34 can be ensured. Further, since the packing main body 340 can be uniformly formed into a substantially semi-elliptical cross section, the sealing property can be stabilized.

(5) It was decided to use the flange portion 311 of the tank body 31 as a sealing member for sealing the gap between the upper mold 50 and the flange portion 311 of the tank body 31. As a result, it is not necessary to separately prepare a seal member, so that the productivity can be further improved.
(6) The packing 34 has an extension portion 343 extending from the packing main body portion 340 to the upper surface 311d through the through hole 318 of the flange portion 311 of the tank main body 31. The stretched portion 343 has a cut surface 343a on the upper surface 311d of the flange portion 311 of the tank body 31. According to such a configuration, the flange portion 311 of the tank body 31 can be used as a sealing member when the tank 3 is manufactured. Specifically, even when a gap is formed between the upper mold 50 and the flange portion 311 of the tank body 31, this gap is closed by using the flange portion 311 of the tank body 31 as a sealing member. be able to. This makes it difficult for the rubber material to flow into the gap between the upper die 50 and the flange portion 311 of the tank body 31, so that the occurrence of burrs can be suppressed. Therefore, the step of removing burrs becomes unnecessary, and the productivity can be improved. Further, if the cut surface 343a is formed on the stretched portion 343 of the packing 34, the overflow portion 344 can be formed on 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 the packing 34 is less likely to have a dent or the like. As a result, the sealing function of the packing 34 can be ensured.

(Modification example)
Next, a modified example of the tank 3 of the heat exchanger 1 of the second embodiment and the manufacturing method thereof will be described.
As shown in FIG. 18, the flange portion 311 of the tank body 31 of this modified example is formed with a through hole 318 penetrating from the bottom surface 311b to the outer peripheral side surface 311c. The upper mold 50 is formed with an overflow flow path 502 so as to communicate with the through hole 318.

In the method of manufacturing the tank 3 of the present embodiment, the upper mold 50 is pressed by the force F against the outer peripheral side surface 311c of the flange portion 311 of the tank body 31 during the injection process. As a result, the flange portion 311 of the tank body 31 is crushed, so that the gap formed between the upper die 50 and the flange portion 311 of the tank body 31 is closed.

In the manufacturing method of the tank 3 of this modification, as shown in FIG. 19, when the manufacturing of the secondary molded product 61 of the tank body 31 and the packing 34 is completed, the packing 34 has a through hole from the packing body 340. It has an extension portion 343 extending from the outer peripheral side surface 311c of the flange portion 311 of the tank body 31 through 318. The stretched portion 343 has a cut surface 343a on the outer peripheral side surface 311c of the flange portion 311.

Even with such a tank 3 of the heat exchanger 1 and a method for manufacturing the same, the same or similar operation and effect as the tank 3 of the heat exchanger 1 of the second embodiment and the method for manufacturing the same can be obtained.
<Other embodiments>
The above embodiment can also be implemented in the following embodiments.

As shown in FIG. 20, a seal member 70 is provided between the left side wall portion 512b of the lower mold 51 and the bottom surface 500 of the upper mold 50, and the right side wall portion 512c of the lower mold 51 and the bottom surface 500 of the upper mold 50 are provided. A seal member 71 may be provided between the two, and the gaps formed between the upper die 50 and the lower die 51 may be closed by these seal members 70 and 71. Even with such a manufacturing method, it is difficult for the rubber material to flow into the gap formed between the upper mold 50 and the lower mold 51, so that the occurrence of burrs can be suppressed.

-The materials of the tank body 31 and the packing 34 can be changed arbitrarily.
-The present disclosure is not limited to the above specific examples. Specific examples described above with appropriate design changes by those skilled in the art are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the above-mentioned specific examples, and their arrangement, conditions, shape, and the like are not limited to those illustrated, and can be changed as appropriate. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

1: Heat exchanger 3: Tank 5: Mold 30: Core plate 31: Tank body 34: Packing 310: Opening 311: Flange part (seal member)
311b: Bottom surface 311c: Outer peripheral side surface 311d: Top surface 311h: Cut surface 317: Overflow portion 317a, 317b: Overflow piece 318: Through hole 340: Packing body portion 341: Stretched portion 341a: Cut surface 342, 344: Overflow portion (surplus portion) )
343: Stretched portion 343a: Cut surface 510, 511: Cavity 512, 501, 502: Overflow flow path 70, 71: Seal member

Claims (4)

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

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