JP2006255746A - Method and tool for manufacturing laminated heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a laminated heat exchanger which has high reliability and can keep strong joinability. <P>SOLUTION: In the manufacturing method of the laminated heat exchanger comprising a core part 11 in which flow passages 15 of heat exchanging fluid are formed between two laminated metallic sheets 1A, 1B and tank parts 12 on the inlet side and the outlet side which are arranged on both ends of the core part so as to communicate to the flow passages 12, before laminating two metallic sheets and forming recessed groove parts on the surface of the metallic sheet of at least one side in places where are non-joined parts, by performing diffusion joining after laminating the metallic sheets by taking the recessed groove parts as the inside, the metallic sheets are joined each other while leaving the recessed groove parts as the non-joined parts. After performing the diffusion joining, the metallic sheets in the portions of the non-joined parts are plastically deformed and bulged by introducing a pressurized fluid into the non-joined parts. In this way, the flow passage parts in the core part and the tank parts 12 are formed at the same time. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a laminated heat exchanger and a jig for manufacturing the same.

  Conventionally, a plurality of metal plates are overlapped, and metal plates are diffusion-bonded at selected locations, and the unbonded portion (non-joined portion) metal plate is plastically deformed by introducing pressurized gas into the interior. A stacked heat exchanger in which a passage of a heat exchange fluid (refrigerant) is formed in a non-joined part and a manufacturing method thereof is known (for example, see Patent Document 1).

  FIGS. 9 and 10 show a conventional example in such a case, FIG. 9A is an exploded perspective view of the completed heat exchanger, and FIG. 9B is a stage before plastic deformation by introduction of pressurized gas. FIG. 10 (a) is a perspective view showing the overall configuration of the completed heat exchanger, and FIGS. 10 (b) and 10 (c) are main part cross-sectional views.

  As shown in FIG. 10, in this heat exchanger, two metal plates 1A and 1B are overlapped, and a plurality of flow passages 15 extending in parallel with each other are formed between the two metal plates 1A and 1B. It has a core part 11 and tank parts 12 provided at both ends of the core part 11.

  One of the tank portions 12 at both ends is an inlet side tank portion that distributes the heat exchange fluid to each flow passage 15 of the core portion 11, and the other is for discharging the heat exchange fluid that has passed through the flow passage 15 to the outside. As shown by an arrow F2, the heat exchange fluid flows from the tank part 12 on the inlet side as shown by an arrow F1 and passes through the flow passage 15 of the core part 11 as shown by an arrow F1. It flows out from the tank part 12 on the outlet side to the outside.

  This type of heat exchanger is formed of titanium, stainless steel, aluminum, or the like.

  In the case of making this heat exchanger, as shown in FIG. 9B, before the two metal plates 1A and 1B are overlapped, the joining preventive agent is formed on the portion where the flow passage 15 is formed by means such as printing. (For example, yttrium oxide in which a binder and a solvent are mixed) 2 is applied, and in this state, the two metal plates 1A and 1B are overlapped. And it heats to predetermined temperature, applying the pressure from the exterior between metal plate 1A, 1B, and metal plate 1A, 1B is diffusion-bonded.

  In FIG. 9B, since the bonding inhibitor 2 is interposed in the region indicated by H, the other regions indicated by S are bonded to each other by diffusion bonding. Therefore, after diffusion bonding, the portion where the bonding inhibitor 2 is interposed remains as a non-bonded portion.

  After diffusion bonding, next, the metal plates 1A and 1B are heated to a temperature at which they can be easily deformed, Ar gas is introduced into the non-bonded portion, and the metal plates 1A and 1B in the non-bonded portion are plastically deformed by the gas pressure. (Expand) to form the core portion 11 having the flow passage 15.

Subsequently, the tank forming member 3 is brazed and joined to both ends of the core portion 11 to constitute the tank portion 12 to complete the heat exchanger.
Japanese Examined Patent Publication No. 7-58158

  By the way, conventionally, as shown in FIG. 9B, the bonding inhibitor 2 is applied to a portion to be a non-bonded portion by a silk screen printing method or the like, but the applied portion (H) is slight. Is raised in a convex shape, it is difficult to apply a high surface pressure to the part (S) to be joined at the time of diffusion joining, and as a result, the joining property may be lowered.

  In view of the above circumstances, an object of the present invention is to provide a method for manufacturing a highly reliable stacked heat exchanger that can maintain strong bondability, and a manufacturing jig used in the method. .

  According to a first aspect of the present invention, there is provided a laminated heat exchanger manufacturing method comprising: a core portion in which a heat exchange fluid flow passage is formed between two stacked metal plates; and the flow passage at both ends of the core portion. The tank portion on the inlet side that distributes the heat exchange fluid introduced from the outside to each of the flow passages, and the heat exchange fluid that has passed through the flow passages join together to be discharged to the outside. In a method for manufacturing a stacked heat exchanger having an outlet-side tank portion, a groove portion is formed on the surface of at least one of the metal plates that are to be non-joined before the two metal plates are overlapped. Then, the two metal plates are overlapped with the concave groove portion inside, and the two metal plates are diffusion-bonded in this state, thereby joining the metal plates to each other while leaving the concave groove portion as a non-joined portion. And pressurizing the non-bonded part after diffusion bonding By introducing the body, inflated a metal plate portion of said non-joined portion by plastically deforming, thereby and forming a flow passage of the core portion.

  Invention of Claim 2 is a manufacturing method of the laminated heat exchanger of Claim 1, Comprising: Pressurized fluid is applied to the said non-joining part in the temperature fall process after the diffusion joining of the said 2 metal plate. It introduce | transduces and forms the flow path of the said core part, It is characterized by the above-mentioned.

  Invention of Claim 3 is a manufacturing method of the lamination | stacking type heat exchanger of Claim 1 or 2, Comprising: A pressurized fluid is introduce | transduced into the said non-joining part after the diffusion joining of the said 2 metal plate. Thus, the tank portion is formed by plastic deformation of the same metal plate simultaneously with the flow passage of the core portion.

  A fourth aspect of the present invention is the method for manufacturing a stacked heat exchanger according to the third aspect, wherein the flow path of the core portion and the tank portion are formed by introducing a pressurized fluid into the non-joined portion. In this case, by introducing the pressurized fluid in a state where the two metal plates are arranged between the molds for plastic working having the cavity for forming the core part and the cavity for forming the tank part, The outer shape and the outer shape of the tank part are formed by the cavity.

  A fifth aspect of the present invention is the method for manufacturing a stacked heat exchanger according to the fourth aspect, wherein a pressure jig is mounted so as to hide the cavity on the opposing surface of the mold for plastic working. Then, a diffusion bonding jig is constituted by the mold and the pressure jig, and diffusion bonding is performed while applying pressure from the outside to the two metal plates by the diffusion bonding jig. The pressurizing jig is removed to expose the cavity, and in that state, a pressurized fluid is introduced into the non-joining portion, thereby forming the flow passage of the core portion and the tank portion.

  Invention of Claim 6 is a manufacturing method of the laminated heat exchanger of Claim 5, Comprising: The said pressurization jig | tool is set to the said metal mold | die, The position which conceals the said cavity, The position which exposes the said cavity It is characterized by being slidable between.

  A seventh aspect of the invention is a method for manufacturing a stacked heat exchanger according to any one of the first to sixth aspects, wherein an inert gas is introduced as the pressurized fluid. .

  The invention of claim 8 is a method for manufacturing a stacked heat exchanger according to any one of claims 1 to 6, wherein a liquid is introduced as the pressurized fluid.

  According to a ninth aspect of the present invention, there is provided a manufacturing tool for a laminated heat exchanger, wherein two superposed metal plates are diffusion-bonded, and then a pressurized fluid is introduced into a non-joined portion of the two metal plates. Then, by plastically deforming and expanding the metal plate of the non-joined portion, a core portion having a heat exchange fluid flow path and tank portions on both the inlet side and the outlet side of the core portion are formed. A jig for manufacturing a laminated heat exchanger comprising: a pair of plastic working molds having a core part forming cavity and a tank part forming cavity, and concealing the cavity on an opposing surface of the mold A pressure jig that constitutes a diffusion bonding jig by being detachably attached to the pressure jig, and the pressure jig slides between a position where the cavity is hidden and a position where the cavity is exposed. It is possible to be provided.

  According to the first aspect of the present invention, since the concave groove portion is formed in advance on the surface of the metal plate, and the concave groove portion forms a non-joined portion at the time of diffusion bonding, a bonding inhibitor is applied to the surface of the metal plate in advance. There is no need to keep it. Therefore, since it is not necessary to interpose a bonding inhibitor between the opposing surfaces of the metal plate, a sufficient surface pressure can be applied to the parts to be bonded at the time of diffusion bonding, and good bonding is performed. Can do.

  According to the invention of claim 2, since plastic working is performed by introducing a pressurized fluid in the temperature lowering process after diffusion bonding, there is no need to reheat after diffusion bonding, productivity can be improved, and heat due to reheating can be achieved. Distortion can be prevented.

  According to the invention of claim 3, since the core portion and the tank portion are formed simultaneously with only two metal plates, it is not necessary to retrofit the tank portion, and the process can be simplified.

  According to the invention of claim 4, since the outer shape of the core portion and the tank portion is regulated by the cavity of the mold at the time of plastic deformation due to the introduction of the pressurized fluid, the shape of the metal plate is not locally expanded. A highly accurate heat exchanger can be manufactured.

  According to the fifth aspect of the present invention, the diffusion bonding mold (diffusion bonding) can be determined by mounting the pressure jig on the opposite surface of the mold to hide the cavity, or removing the pressure jig to expose the cavity. Specifications) and plastic working molds (plastic working specifications), the main parts of the manufacturing apparatus can be made common, which contributes to cost reduction.

  According to the invention of claim 6, simply by sliding the pressure jig, it becomes a diffusion bonding die (diffusion bonding specification) and a plastic working die (plastic processing specification). It is possible to shift to a state where plastic working is possible.

  According to the seventh aspect of the invention, since the inert gas is introduced as the pressurized fluid, plastic processing can be easily performed, and post-processing such as cleaning can be facilitated.

  According to invention of Claim 8, since a liquid is introduce | transduced as a pressurized fluid, it can cold-work and can eliminate influences, such as distortion by heating.

  According to the ninth aspect of the present invention, the diffusion bonding mold (diffusion bonding) is determined by mounting the pressure jig on the opposite surface of the mold to hide the cavity, or by removing the pressure jig to expose the cavity. Specifications) and plastic working molds (plastic working specifications), the main parts of the manufacturing jig can be made common, contributing to cost reduction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing the configuration of a stacked heat exchanger manufactured by the manufacturing method of the embodiment of the present invention, FIG. 2 is a diagram showing the configuration of a metal plate for configuring the heat exchanger, and FIG. The figure which shows the state which accumulated the metal plate, FIG. 4 is the sectional drawing.

  As shown in FIG. 1, the laminated heat exchanger to be manufactured here has a plate-like shape in which a heat exchange fluid (refrigerant) flow passage 15 is formed between two stacked metal plates 1A and 1B. It has a core part 11 and tank parts 12 at both ends of the core part 11.

  One of the tank portions 12 at both ends is an inlet side tank portion that distributes the heat exchange fluid to each flow passage 15 of the core portion 11, and the other is for discharging the heat exchange fluid that has passed through the flow passage 15 to the outside. It is a tank part on the exit side to be joined, and the tank parts 12 at both ends are integrally formed by two metal plates 1A and 1B constituting the core part 11, as will be described later. Here, the metal plates 1A and 1B are made of materials such as titanium, stainless steel, and aluminum, for example, and are also called core plates.

  Next, the manufacturing method of embodiment of this invention for obtaining this heat exchanger is demonstrated.

  When obtaining this heat exchanger, first, the two metal plates 1A, 1B are overlapped, but before the two metal plates 1A, 1B are overlapped, as shown in FIG. A concave groove 5 is formed on the surface of at least one (both in this example) of the metal plates 1A and 1B where the non-joining portion H is formed by etching or the like. It is preferable to set the dent amount d of the groove portion 5 to 3 to 4% or more of the plate thickness t of the metal plates 1A and 1B.

  Next, as shown in FIG. 3, the two metal plates 1 </ b> A and 1 </ b> B are overlapped with the concave groove portion 5 facing inward. FIG. 4 shows a cross section in a superposed state. 4A is a cross-sectional view of a portion that becomes the tank portion 12, and FIG. 4B is a cross-sectional view of a portion that becomes the flow passage of the core portion.

  When the two metal plates 1A and 1B are positioned and overlap each other, they are set on a jig for diffusion bonding.

  Here, a common manufacturing jig as shown in FIGS. 5 to 7 is used, in which a diffusion bonding jig and a plastic deformation mold used in the subsequent steps are combined.

  As shown in FIG. 6, the manufacturing jig has a core part forming cavity 22b (21b) and a tank part forming cavity 22a (21a) on the opposing mating surfaces. A pair of upper and lower molds 21 and 22 are used as main elements, and a mold closing force can be applied to these molds 21 and 22 from the outside. A jig 30 is provided on each of the upper and lower molds 21 and 22 so as to be movable.

  The pressurizing jig 30 is attached to the opposing surfaces of the plastic working dies 21 and 22 so as to hide the cavities 22b (21b) and 22a (21a), thereby being used together with the dies 21 and 22 for diffusion bonding. The jig (diffusion bonding mold) is configured as shown in FIGS. 5 (a), 5 (b), and 7 (a). The pressure surfaces of the opposed molds 21 and 22 are made to have a surface shape required for diffusion bonding (for example, a flat surface) without being affected by the cavities 22b (21b) and 22a (21a).

  The pressurizing jig 30 is constituted by two members 31 divided in two in a direction corresponding to the width direction of the core portion 11, and a diffusion bonding position that hides the cavities 22b (21b) and 22a (21a) at the time of diffusion bonding. And a plastic deformation position that exposes the cavities 22b (21b) and 22a (21a) when a pressurized fluid is introduced (see FIGS. 5C, 5D, and 7B). It has been.

  FIG. 6 shows a state in which the pressing jig 30 is set at the plastic deformation position, and the arrows in the drawing indicate the sliding directions of the two members 31 constituting the pressing jig 30.

  Subsequently, the procedure of the manufacturing method of the laminated heat exchanger will be described. First, FIGS. 5A, 5B and 7A are formed on the opposing surfaces of the upper and lower molds 21 and 22 of the manufacturing jig. ), The pressure jig 30 is slid and set so as to hide the cavities 22b (21b) and 22a (21a) to obtain a diffusion bonding die.

  In this state, the two metal plates 1A and 1B are arranged in an overlapping manner between the upper and lower pressure jigs 30 and the molds are closed, and pressure is applied to the two metal plates 1A and 1B from the outside. Then, the diffusion bonding is performed by raising the temperature to the diffusion bonding temperature. In the case of stainless steel, the diffusion bonding temperature is about 1100 ° C.

  When the diffusion bonding is performed, the position where the concave groove portion 5 is located is not bonded, so that it remains as the non-bonded portion H as shown in FIG.

  When the diffusion bonding is completed, the molds 21 and 22 are once opened, and the pressing jig 30 is moved from the diffusion bonding position that hides the cavities 22b (21b) and 22a (21a) as shown in FIG. The mold is slid to a plastic deformation position that does not interfere with plastic deformation, and the cavities 22b (21b) and 22a (21a) are exposed to form a plastic deformation mold.

  Then, the molds 21 and 22 are closed again, and as shown in FIG. 8, the metal is still soft at a stage where the temperature is lowered to a predetermined temperature, that is, in the temperature lowering process after the diffusion bonding. At the stage P where the temperature has dropped to the level of, an inert gas such as Ar gas is introduced as a pressurized fluid into the non-joined portion H between the metal plates 1A and 1B. The plates 1A and 1B are plastically deformed and expanded to form the flow passage 15 and the tank portion 12 of the core portion 11 at the same time.

  Thereby, the heat exchanger of FIG. 1 is obtained.

  In addition, the injection | pouring location of pressurized gas shall be set according to a product. In this example, the liquid is injected at a position corresponding to one tank portion 12 and discharged at a position corresponding to the other tank portion 12. Further, in the diffusion bonding temperature pattern of FIG. 8, the a section corresponds to the diffusion bonding process, and the b section corresponds to the plastic deformation process.

  As described above, in the manufacturing method of the above-described embodiment, the groove portion 5 is formed in advance on the surfaces of the metal plates 1A and 1B, and the non-joint portion H is formed by the groove portion 5 at the time of diffusion bonding. Thus, it is not necessary to apply a bonding inhibitor to the surfaces of the metal plates 1A and 1B. Therefore, since it is not necessary to interpose a bonding inhibitor between the opposing surfaces of the metal plates 1A and 1B, a sufficient surface pressure can be applied to the parts to be bonded during diffusion bonding, and good bonding is achieved. It can be performed.

  In addition, since plastic processing is performed by introducing a pressurized fluid in the temperature lowering process after diffusion bonding, there is no need to reheat after diffusion bonding, productivity can be improved, and thermal distortion due to reheating can be prevented. .

  Moreover, since the core part 11 and the tank part 12 are formed simultaneously only by the two metal plates 1A and 1B, it is not necessary to retrofit the tank part 12 as in the prior art, and the process can be simplified.

  Moreover, since the outer shape of the core part 11 and the tank part 15 is regulated by the cavities 21a, 21b, 22a, and 22b of the molds 21 and 22 at the time of plastic deformation due to introduction of the pressurized fluid, the metal plates 1A and 1B are locally provided. A heat exchanger having an appropriate shape with high shape accuracy can be produced without swelling.

  Further, a pressure jig 30 is attached to the opposing surfaces of the molds 21 and 22 to hide the cavities 21a, 21b, 22a and 22b, or the pressure jig 30 is removed to expose the cavities 21a, 21b, 22a and 22b. By doing so, it becomes a diffusion bonding mold (diffusion bonding specification) and a plastic working mold (plastic processing specification), so that the main parts of the manufacturing equipment can be shared, contributing to cost reduction. it can.

  In addition, by simply sliding the pressure jig 30, it becomes a diffusion bonding mold (diffusion bonding specification) and a plastic processing mold (plastic processing specification), so that it is ready for plastic processing immediately after diffusion bonding. can do.

  In addition, since an inert gas such as Ar gas is introduced as the pressurized fluid, plastic processing can be easily performed, and post-processing such as cleaning can be facilitated.

  In addition, a liquid may be introduced instead of the pressurized gas to plastically deform the metal plates 1A and 1B. When processing using liquid pressure, it is possible to perform cold processing without heating to a high temperature, eliminating the effects of distortion due to extra heating, and the timing of processing is also affected by the diffusion bonding process. You can set it freely.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the laminated heat exchanger manufactured by the manufacturing method of embodiment of this invention, (a) is a perspective view which shows the whole structure, (b), (c) is Ib-Ib arrow of (a), respectively. It is a sectional view and Ic-Ic arrow sectional view. It is a block diagram of the metal plate prepared when manufacturing a heat exchanger by the method of embodiment, (a) is a top view, (b) is IIb-IIb arrow sectional drawing of (a). It is a figure which shows the state which piled up the two metal plates shown in FIG. 2, (a) is a perspective view, (b) is a top view. (A), (b) is respectively IVa-IVa arrow sectional drawing and IVb-IVb arrow sectional drawing of FIG. It is explanatory drawing of process (a)-(d) of the manufacturing method of embodiment. It is a perspective view which shows a partial structure of the manufacturing jig | tool used with the manufacturing method of embodiment. It is explanatory drawing of the jig | tool for manufacture used with the manufacturing method of embodiment, (a) is a figure which shows a state when set to a diffusion joining specification and (b) to a plastic deformation specification. It is a figure which shows the temperature pattern in the case of implementing a process with the manufacturing method of embodiment. It is a figure used for description of the conventional manufacturing method, (a) is an exploded perspective view of the completed heat exchanger, (b) shows the laminated state of the metal plate in the stage before plastically deforming by introduction of pressurized gas. FIG. It is explanatory drawing of the conventional heat exchanger, (a) is a perspective view which shows the whole structure of the completed heat exchanger, (b) is Xa-Xa arrow sectional drawing of (a), (c) is (a). It is Xb-Xb arrow sectional drawing of.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A, 1B ... Metal plate 5 ... Groove part 11 ... Core part 12 ... Tank part 20 ... Manufacturing jig 21, 22 ... Mold 21a, 22a ... Cavity for tank part formation 21b, 22b ... Cavity for core part formation 30 ... Pressurizing jig S ... Joint part H ... Non-joint part

Claims (9)

A core part (11) in which a heat exchange fluid flow path (15) is formed between the two stacked metal plates (1A, 1B), and the flow path (15) at both ends of the core part (11). And the tank portion (12) on the inlet side for distributing the heat exchange fluid introduced from the outside to each flow passage (15) and the flow passage (15). In the manufacturing method of the stacked heat exchanger having a tank part (12) on the outlet side that joins the heat exchange fluid to discharge to the outside,
Before the two metal plates (1A, 1B) are overlaid, a concave groove (5) is formed on the surface of at least one of the metal plates (1A, 1B) where the non-joint portion (H) is formed. The two metal plates (1A, 1B) are overlapped with the concave groove portion (5) on the inside, and in this state, the two metal plates (1A, 1B) are diffusion bonded to each other so that the concave groove portion is not bonded. The metal plates (1A, 1B) are joined together while leaving as a part,
After diffusion bonding, by introducing a pressurized fluid into the non-bonded portion (H), the metal plate (1A, 1B) of the non-bonded portion (H) is plastically deformed and thereby expanded, thereby the core portion. The flow path (15) of (11) is formed. The manufacturing method of a laminated heat exchanger characterized by the above-mentioned. It is a manufacturing method of the lamination type heat exchanger according to claim 1,
In the temperature lowering process after diffusion joining of the two metal plates (1A, 1B), a pressurized fluid is introduced into the non-joining part (H), and the flow path (15) of the core part (11) is formed. A method of manufacturing a laminated heat exchanger, characterized in that the method is formed. It is a manufacturing method of the lamination type heat exchanger according to claim 1 or 2,
After diffusion joining of the two metal plates (1A, 1B), by introducing a pressurized fluid into the non-joining part (H), the same metal as the flow path (15) of the core part (11) is used. The said tank part (12) is formed by plastic deformation of a board (1A, 1B). The manufacturing method of a laminated heat exchanger characterized by the above-mentioned. It is a manufacturing method of the lamination type heat exchanger according to claim 3,
When forming the flow path (15) of the core part (11) and the tank part (12) by introducing a pressurized fluid into the non-joining part (H), the core part forming cavities (21b, 22b) ) And the two metal plates (1A, 1B) are placed between the molds (21, 22) for plastic working having the cavity (21a, 22a) for forming the tank portion, and the pressurized fluid is introduced. Thus, the outer shape of the core portion (11) and the outer shape of the tank portion (12) are formed by the cavities (21a, 21b, 22a, 22b). It is a manufacturing method of the lamination type heat exchanger according to claim 4,
By attaching a pressing jig (30) so as to hide the cavities (21a, 21b, 22a, 22b) on the opposing surfaces of the plastic working dies (21, 22), the molds (21, 22) 22) and a pressure jig (30) constitute a diffusion bonding jig, and diffusion bonding is performed by applying pressure from the outside to the two metal plates (1A, 1B) by the diffusion bonding jig. After that, by removing the pressurizing jig (30) to expose the cavities (21a, 21b, 22a, 22b) and introducing a pressurized fluid into the non-joining part (H) in that state The flow path (15) of the core part (11) and the tank part (12) are formed. A method for manufacturing a stacked heat exchanger, wherein: It is a manufacturing method of the lamination type heat exchanger according to claim 5,
A position for hiding the cavity (21a, 21b, 22a, 22b) and a position for exposing the cavity (21a, 21b, 22a, 22b), the pressure jig (30) on the mold (21, 22); A method for manufacturing a stacked heat exchanger, characterized in that the slide heat exchanger is slidable between the two. It is a manufacturing method of the lamination type heat exchanger according to any one of claims 1 to 6,
An inert gas is introduced as the pressurized fluid. A method for manufacturing a laminated heat exchanger. It is a manufacturing method of the lamination type heat exchanger according to any one of claims 1 to 6,
A liquid is introduced as the pressurized fluid. A method for manufacturing a stacked heat exchanger, wherein: The two metal plates (1A, 1B) overlapped are diffusion-bonded, and then a pressurized fluid is introduced into the non-bonded portion (H) of the two metal plates (1A, 1B), and the non-bonded portion The metal plate (1A, 1B) of (H) is plastically deformed to expand, thereby providing a core portion (11) having a heat exchange fluid flow passage (15) and inlets at both ends of the core portion (11). A laminated heat exchanger manufacturing jig formed by forming a tank part (12) on the side and the outlet side,
A pair of molds (21, 22) for plastic working having core part forming cavities (21b, 22b) and tank part forming cavities (21a, 22b), and opposing surfaces of the molds (21, 22) A pressure jig (30) constituting a jig for diffusion bonding by being detachably mounted so as to hide the cavities (21a, 21b, 22a, 22b),
The pressure jig (30) is slidably provided between a position where the cavity (21a, 21b, 22a, 22b) is hidden and a position where the cavity (21a, 21b, 22a, 22b) is exposed. A jig for manufacturing a laminated heat exchanger, characterized in that:

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