JP5395341B2 - Manufacturing method of laminate - Google Patents

Description

  The present invention relates to a laminate including a plurality of plates laminated and a manufacturing method thereof.

  Such a laminated body is often used as a heat exchanger for exchanging heat, and such a heat exchanger is configured to stack a plurality of plates having multiple rows of grooves and flow through the overlapping plates, for example, the grooves closed by the upper and lower plates. A multi-row flow path is formed in each plate as a path. Then, the heat exchanger causes a high-temperature fluid to flow in a flow path of a certain layer and a low-temperature fluid to flow in a flow path of the upper and lower layers of the certain layer, so that the fluid passes through the flow path of the upper and lower layers. Heat exchange is performed (for example, Patent Document 1).

Japanese Patent Laid-Open No. 2003-262489 JP 2007-15873 A

  In addition to the heat exchangers proposed in these patent documents, in general heat exchangers, the casing as the outer casing is introduced due to the introduction of a medium for heat exchange or the handling or mounting of the medium on equipment. Prepare the body. Since such a heat exchanger housing houses a heat exchanger body having a flow path inside, it is difficult to form a hollow single part, and a plurality of members, most of which are a plurality of plate materials, are made of a solder such as silver solder. It is formed by bonding and fixing using a material. In addition, in the heat exchanger body housed in the housing, from the viewpoint of securing the sealability of the flow path and productivity, the joint location while pressing in the stacking direction after stacking a plurality of plates, Specifically, the joint portion between the top surface of the ridge forming the groove and the plate is joined and fixed using a brazing material such as silver brazing.

  By the way, when fixing to a heat exchanger to other equipment, for example, medium introduction equipment, etc., in order to secure the mechanical strength between the heat exchanger in a fixed state and the other equipment, a fixing method by welding is usually used. It is used. In other words, the end of the heat exchanger or the end of the housing that houses the heat exchanger is brought into contact with another device, or the end of the housing is fitted into the mounting opening of another device, and vice versa. The other device is fitted into the end opening of the casing, and is fixed to the other device by welding.

  Although the mechanical strength can be ensured by fixing by welding as described above, the heat of the welding causes melting of the brazing material that joins and fixes the plates in the heat exchanger and the casing itself around the welding location ( There is a concern that remelting may occur. When joining and fixing using a brazing material, since a member, that is, a constituent material of a heat exchanger or a casing is generally pressed, stress often remains in the pressed portion. Therefore, if the remelting of the brazing material as described above occurs, it may cause deformation due to residual stress and bonding peeling. In addition, if the entire area of the bonding and fixing portion of the casing by the brazing material is bonded and fixed by welding, the brazing material melting as described above does not occur, but when the casing is welded and joined, the heat exchange already stored in the casing In order to melt the brazing material used for plate joining in the vessel main body, it is not realistic to weld the casing.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a new technique for welding and fixing a heat exchanger and a casing surrounding the heat exchanger to other constituent members.

In order to achieve at least a part of the above object, the present invention adopts the following configuration.
A method of manufacturing a laminate that is bonded to another component through heat treatment,
A first joining step of laminating a plurality of plates, and joining the plates by a joining process using a brazing material at a plate joining location between the laminated plates;
In a predetermined range of the plate joining portion between the plates from the one end side end surface of the laminate that is joined to the other component member, the heat treatment is performed at a higher temperature than the joining process using the brazing material. A second joining step of joining the plates together by a joining process by welding,
The plate joint location between the plates in the predetermined range from the one end surface portion of the laminate subjected to the joint treatment by welding and the plate joint location between the plates subjected to the joint treatment using the brazing material are continuous. doing.

[Application 1: Manufacturing method of laminate]
A method of manufacturing a laminate that is bonded to another component through heat treatment,
A first joining step of laminating a plurality of plates and joining the plates by a first heat treatment to form a laminate;
In a predetermined range including a joining portion where joining to the other constituent member is performed, a second joining step of joining the plates to each other by a heat treatment at a temperature higher than that of the first heat treatment is provided. This is the gist.

  In the laminated body described above, the heat treatment location in the second joining step is divided from the heat treatment location in the first joining step, and the heat treatment location in the second joining step is determined from the first heat treatment in the first joining step. In addition to the second heat treatment at a high temperature, the portion is set to a predetermined range including a joint portion to be joined to another constituent member. Therefore, when the laminated body is bonded to another constituent member at the bonding portion, even if the temperature of the heat treatment is higher than the temperature of the first heat treatment, the portion affected by the heat is higher than the temperature of the first heat treatment. Since it is a peripheral part of the joint that has already undergone a high heat treatment, inconveniences associated with the heat treatment at the time of joining other components are reduced. For example, when heat treatment using a brazing material is performed in the first joining process, welding is performed in the second joining process, and welding is performed as heat treatment at the time of joining other constituent members, Since it can be made not to be used, remelting of the brazing material in the peripheral portion of the joint portion does not occur. Therefore, when fixing a laminated body to another structural member in the junction part, a laminated body can be weld-fixed to another structural member by a welding method without trouble.

  In this case, the heat when the laminated body is welded and fixed to other constituent members at the joining portion propagates to the heat treatment region in the first joining step beyond the joining portion, but the heat treatment region in the second joining step is predetermined. By securing the range, the capacity of the propagated heat can be reduced. Therefore, remelting of the brazing material in the heat treatment region in the first bonding step due to the propagated heat can be avoided with high effectiveness.

  The manufacturing method of an above-mentioned laminated body can be made into the following aspects. For example, the heat treatment in the second bonding step can be performed before the heat treatment in the first bonding step. In this way, when the brazing material is fixed using the brazing material in the heat treatment region of the first joining process, the welding in the heat treatment region of the second joining process has already been completed. Remelting can be reliably avoided.

  In addition, the heat treatment in the second joining step can be performed under the condition where the laminate is pressed in the laminating direction of the plates. In this way, even if the heat during the heat treatment in the second bonding step is transferred to the heat treatment region in the first bonding step, the following advantages are obtained. Since the laminated body of the plates is pressed in the plate lamination direction, the joined state and the joined and fixed state of the portions that have already been joined and fixed with the brazing material in the heat treatment region of the first joining process are maintained by pressing. Therefore, when a laminated body forms a flow path by plate lamination, the sealing performance of the flow path can be maintained.

[Application 2: Other manufacturing method of laminate]
A method for producing a laminate in which a plate laminate in which a plurality of plates are laminated is surrounded by a housing,
A preparation step of preparing the plate laminate;
A casing forming step of forming the casing by contacting a plurality of plate members for forming the casing, and storing the plate laminate in a storage area in the casing spaced apart from the end of the casing;
In an end joining region within a predetermined range from the housing end, an end fixing step of joining and fixing the plurality of plate members by welding,
The present invention includes a remaining fixing step of bonding and fixing the plurality of plate materials using a brazing material in a remaining area other than the end bonding area and including the storage area.

[Application 3: Laminate]
A laminate in which a plurality of plates having a groove are laminated, and a plate laminate including a flow path formed by the overlapping plate and the groove is surrounded by a housing,
The plate laminated body closes the groove by joining and fixing a plate facing the top surface of the ridge forming the groove with a brazing material between the overlapping plates. Road and
The housing is
A plurality of plate members that form a storage area for storing the plate laminate separated from the end of the housing,
The plurality of plate members are joined and fixed by welding in an end joining region in a predetermined range from the housing end,
The gist is that the plurality of plate members are joined and fixed with a brazing material in the remaining region including the storage region other than the end joint region.

  In the laminated body described above, the plate laminated body is surrounded by the casing, and then the plate laminated body is stored in a storage area away from the end of the casing. And the housing | casing which accommodated the plate laminated body in this way WHEREIN: In joining and fixing the several board | plate materials for forming this housing | casing, several board | plate materials are in the edge part joining area | region of a predetermined range from a housing | casing edge part. Are joined and fixed by welding, and a plurality of plate members are joined and fixed using a brazing material in the remaining region including the storage region of the heat exchanger main body in a region other than the end joint region. That is, since the brazing material is not fixed to the end joining region, the brazing material in the end joining region is heated by the heat during welding when the casing is welded and fixed to another component at the end. Remelting does not occur. Therefore, when fixing a laminated body to another structural member with the housing | casing, a housing | casing can be weld-fixed to another structural member by a welding method without trouble.

  In this case, the heat at the time of welding and fixing the housing to other constituent members at the end portion propagates to the remaining region beyond the end joint region, but by securing a predetermined range of the end joint region, the above The capacity of the propagated heat can be reduced. Therefore, remelting of the brazing material in the remaining region due to the propagated heat can be avoided with high effectiveness. In addition, even if the above-mentioned propagated heat is transmitted to the plate laminate housed in the housing in the housing region included in the remaining region, the housing region is farther from the end of the housing than the end joint region. , Its propagation heat capacity is less. For this reason, remelting of the brazing material at the brazing material joint fixing portion in the plate laminate can be made difficult to occur.

  Such a plate laminate can be applied as a heat exchanger having a layered flow path. In this case, in this plate laminate (heat exchanger), plates having multiple rows of grooves are laminated, The top surfaces of the ridges forming the rows of grooves are joined to the opposing plates, the laminated plate is pressed to join the top surfaces of the ridges to the plates, and after the heat treatment using the brazing material, the brazing material plate Will be fixed. As a result, the multiple rows of grooves are closed to form flow paths, and the flow paths are formed in layers. Therefore, when the plate laminate is applied to a heat exchanger, it is difficult for remelting of the brazing material used for the heat treatment of the plate having grooves, so that the plate laminate by remelting the brazing material (heat exchanger) It is also possible to avoid a situation where the sealing performance of the flow path is lowered.

  The laminate described above can be in the following manner. For example, the joining and fixing of the plurality of plate members by welding in the end joining region can be performed before the joining and fixing of the plurality of plate members using the brazing material in the remaining region. In this way, when the brazing material is used for fixing in the remaining region, the welding in the end joining region has already been completed, so that remelting of the brazing material accompanying the welding can be avoided reliably.

  In preparing the plate laminate, a brazing material is used between the overlapping plates of the laminated plates in which a plurality of plates having grooves are laminated, and the plate facing the top surface of the ridges forming the grooves. The plate is laminated and closed by closing the groove, and the closed groove is used as the flow path. In the housing forming step, four sheets are formed to form left and right side walls and upper and lower walls surrounding the plate laminated body. The plate laminate in which the four plate members are brought into contact with each other in a state in which the upper and lower wall plate members are sandwiched between the left and right side wall plate members, and the welding in the end fixing step is stored in the storage region. Can be performed under the condition of pressing in the laminating direction of the plates.

  In this way, even if the heat at the time of joining the plate for forming the case is transferred to the plate laminate housed in the case, the following advantages are obtained. Since the plate stack is pressed in the plate stacking direction, the locations where the brazing material has already been bonded and fixed in the plate stack, i.e., the bonding state of the top surface of the ridge and the plate and the state of bonding fixing are as follows: Maintained by pressing. Therefore, the sealing property of the flow path in the plate laminate can be maintained, or the deterioration of the sealing property can be suppressed.

  In addition, the brazing material used for joining the plate members of the casing in the remaining region is fixed to the brazing material used for joining each plate of the plate laminate in fixing the brazing material in the remaining region at the time of fixing the housing. Also, a brazing material having a low melting point can be used. In this way, since the remelting of the brazing material of the plate laminate does not occur due to the heat at the time of joining with the brazing material of the casing plate in the remaining area, the deterioration of the sealing performance of the flow path in the plate laminate is suppressed. it can.

[Application 4: Another manufacturing method of laminate]
A method for producing a laminate in which a plate laminate in which a plurality of plates are laminated is surrounded by a housing,
Between the plate materials for forming the upper and lower walls of the plate laminate, the top surfaces of the ridges that form the grooves by laminating a plurality of the plates are opposed to each other at a position away from the plate end. Lamination joining process to join the plate,
A plate material for forming both side walls of the plate laminate is brought into contact with both side surfaces of the laminated plate and both side surfaces of the plate material for forming the upper and lower walls, and the laminate is formed by the plate material for forming the side wall. A casing forming step of forming the casing that surrounds the stacked plates, in a state in which the stacked plates and the plate materials for forming the upper and lower walls are constrained in a direction crossing the plate stacking direction;
A housing fixing step for joining and fixing the contact portions of the plate material for forming the side wall and the plate material for forming the upper and lower walls;
In the lamination joining step, the plate is laminated in a state where a brazing material is interposed on the top surface of the ridge in the plate,
When the joining process is performed in the housing fixing step, the plate material for forming the both side walls that have been contacted and the upper and lower walls are formed in an end joining region within a predetermined range from the end of the plate material. End region fixing for joining and fixing the plate material by welding, and a plate material for forming the abutted side wall in the remaining region including the laminated plate in a region other than the end joint region, The remaining region is fixed by joining the plate for forming the upper and lower walls using a brazing material, and the remaining plate is fixed along the stacking direction between the stacked plates between the plates for forming the upper and lower walls. By carrying out under the pressed condition, the gist is to jointly fix the top surface of the stacked plate and the plate with the intervening brazing material simultaneously with the fixing of the remaining area.

  According to this manufacturing method, a plate laminate applicable as a heat exchanger can be manufactured simultaneously with the formation and fixing of the casing, and the obtained plate laminate (heat exchanger) can be used as another constituent member in the casing. Can be fixed by welding without hindrance.

  The laminate described above can be in the following manner. For example, in the housing fixing step, the end region fixing is performed before the remaining region fixing, and the laminated plate is melted by the brazing material interposed between the laminated plate and the top surface. The end region fixing is performed by reducing the gap between the plate members for forming the upper and lower walls in the end joint region by an amount corresponding to the shrinkage of the stacking dimension. In this way, at the time of joining and fixing using the brazing material in the remaining region, since the welding in the end joining region has already been completed, the joining and fixing using the brazing material in the remaining region is performed at the end portion. It can be carried out without being affected by welding in the joining area. In addition, when the remaining area is fixed, the laminated plates are submerged due to the melting of the brazing material in the plate laminate, and the respective plates (specifically, the top surface of the ridge top and the plate) and the brazing material plate for brazing are formed. After the completion of the remaining area fixing, the fixing target with the brazing material for fixing the residual area from the end of the plate material of the upper and lower walls, which is the target for welding fixing with the end area fixing, is performed. Up to the upper and lower wall parts become almost the same height. Even if the ends of the upper and lower wall plates to be fixed by welding in the end region fixing and the upper and lower wall portions to be fixed by the brazing material in the remaining region fixing are the same plate material. If it is fixed to the plate material on both side walls at different heights, inadvertent stress remains on the plate material on the upper and lower walls, which may cause separation of the joint fixing portion. However, since the upper and lower wall plate members are fixed to the both side wall plate members so as to have substantially the same height as described above, it is possible to suppress the separation of the joint fixing portions.

Hereinafter, embodiments of the present invention will be described based on examples. FIG. 1 is an explanatory view showing a schematic configuration of a heat exchanger 100 as a reference example of the present invention, and FIG. 2 is an explanatory view showing the heat exchanger 100 as viewed from the end in front.

  As illustrated, the heat exchanger 100 includes a plate unit 110 housed in a housing 130. The plate unit 110 is a stacked body of plates, and includes a plurality of heat transfer plates 116 stacked on a flat bottom layer plate 115. And this plate unit 110 forms the flow path 150 in multiple rows between the upper and lower plates which overlap, and has this multi-row flow path 150 in layer form. The flow paths 150 are formed in multiple rows by closing and fixing the top surfaces of the ridges 118 for forming the bottomed grooves 117 to the opposing plates by the heat transfer plate 116.

  The housing 130 is formed by joining four plates, that is, left and right side plates 131S joined to both side surfaces of the plate unit 110, and an upper plate 131U and a lower plate 131D joined to the upper and lower surfaces of the plate unit 110. . That is, as shown in FIGS. 1 and 2, the housing 130 has the upper and lower plate end surfaces sandwiched between the upper and lower side plates 131 </ b> S with the upper and lower side plates 131 </ b> S sandwiching the upper plate 131 </ b> U and the lower plate 131 </ b> D. It is joined to the side. The casing 130 surrounds and stores the plate unit 110 in a storage area TS in the casing that is separated from the end of the casing by a predetermined distance DL. In this case, the upper surface plate 131U is joined to the upper surface of the plate unit 110, the lower surface plate 131D is joined to the lower surface of the plate unit 110, and the left and right side plates 131S are joined to the side surfaces of the plate unit 110, respectively.

  The casing 130 is formed by joining the upper, lower, left, and right plates as described above to form the outer shape thereof, and the plates are fixed as follows. That is, as shown in FIG. 1, in the end portion joining area WA within a predetermined range from the housing end, the side plate 131S and the upper surface plate 131U, and the side plate 131S and the lower surface plate 131D are joined and fixed by welding. ing. Therefore, the housing | casing 130 has the welding line WLA in the plate contact location in the edge part joining area | region WA. In the remaining area NWA which is an area other than the end joining area WA and includes the storage area TS of the plate unit 110 described above, the respective plates are joined and fixed with a brazing material. Note that the end joint area WA is shorter than the distance DL from the housing end to the storage area TS.

The heat exchanger 100 as a finished product shown in FIGS. 1 and 2 is used after the end surface of the housing 130 is joined to the separate device TP in FIG. 1 and the end surface is fixed by welding. In the plate unit 110, the high-temperature fluid is caused to flow through the multi-row flow paths 150 in one of the upper and lower layers of the multi-row flow paths 150 that are stacked in layers, and the multi-row flow paths in the other layer are flown. By flowing a low-temperature fluid through the channel 150, heat exchange of the fluid passing through the upper and lower layer channels is performed. In this reference example , in consideration of heat transfer properties and durability, each of the heat transfer plates is a metal plate, specifically a stainless steel plate. The same applies to each of the four plates constituting the housing 130.

  Next, the manufacturing process of the above-described heat exchanger 100 will be described. FIG. 3 is a process diagram showing the manufacturing process of the heat exchanger 100, and FIG. 4 is an explanatory diagram showing the state of plate unit storage and housing formation in the heat exchanger manufacturing process.

  As shown in FIG. 3, first, a plate unit 110 as a heat exchanger body is prepared (step S100). In other words, the plate unit 110 that has already been laminated and fixed is prepared by laminating the above-mentioned plates, or the heat transfer plate 116 is laminated on the lowermost layer plate 115, and the plates are joined and fixed while pressing from the laminating direction. Thus, the plate unit 110 is created. When the plate unit 110 is produced in this way, the top surface of each plate in the plate unit 110 and the joining portion of the plate are joined and fixed with silver solder. The same applies to the plate unit 110 that has already been created.

  Next, as shown in FIG. 4, left and right side plates 131S, an upper surface plate 131U, and a lower surface plate 131D are prepared, the plate unit 110 is placed in the storage area TS in the lower surface plate 131D, and the upper surface plate 131U is disposed on the lower surface plate. It is made to oppose 131D, and the left and right side plates 131S are brought into contact therewith (step S110). Thereby, the outline of the housing 130 is formed and the plate unit 110 is stored in the housing. In this case, silver solder is applied to the contact portion between the side plate 131S and the upper surface plate 131U and the contact portion between the side plate 131S and the lower surface plate 131D. This silver solder coating range is the remaining area NWA shown in FIG. In this case, if silver brazing is applied also to the left, right, upper and lower peripheral walls of the plate unit 110, the plate unit 110 is bonded to the left and right side plates 131S and the upper surface plate 131U and the joining unit using the silver brazing described later. The lower plate 131D can be bonded and fixed with silver solder. In this way, it is possible to prevent displacement of the plate unit 110 after the storage.

  The upper plate 131U and the lower plate 131D have a width that matches the width of the plate unit 110, and the left and right side plates 131S have a height that matches the sum of the plate unit 110 and the thickness of the upper and lower plates. Has been. Therefore, the plate unit 110 is surrounded by the left and right and upper and lower plates of the housing 130 by being joined to the left and right and upper and lower plates, and is housed in the housing 130.

  Next, the left and right side plates 131S, the upper surface plate 131U, and the lower surface plate 131D are held so as not to be misaligned by using a jig (not shown) to hold the housing shape (step S120). In this state, the plate contact portion is fixed by welding over the range of the end joint area WA shown in FIG. 1 using a welding torch (step S130). As a result, a welding line WLA is formed at the plate contact portion in the end joint region WA. After that, the casing 130 in which the plate unit 110 is stored is subjected to a joining process in which the casing 130 is held in a temperature environment in which the coated silver wax melts while maintaining the casing shape (step S140). As a result, through the melting of the applied silver solder and the subsequent cooling, the plate contact portion is bonded and fixed by the silver solder over the range of the remaining area NWA shown in FIG. In this case, instead of pre-applying silver solder to the contact points of the left and right and upper and lower plates of the casing in step S110, the contact points of the left and right and upper and lower plates of the casing in this step S140. It can also be applied to the outer wall of the housing. Even if the silver wax is applied to the outer wall in this manner, the molten silver wax enters the contact portion of the plate, so that the plate contact portion can be fixed by the silver solder.

  The joining process in step S140 is completed by cooling until the silver solder is solidified, and after the silver solder cooling, a jig (not shown) that has been used for holding the housing shape until then is used on the left, right, upper, and lower sides of the housing. The housing is released from the plate and the housing is released (step S150). Thereby, the manufacturing process of the heat exchanger 100 in which the plate unit 110 is stored in the housing 130 is completed.

As described above, in the present reference example , when manufacturing the heat exchanger 100, first, the left and right and upper and lower plates constituting the housing 130 are brought into contact with the left and right and upper and lower peripheral walls of the plate unit 110, and the plate The unit 110 is enclosed by the casing 130 and stored (step S110). In this case, the plate unit 110 is stored in the storage area TS that is separated from the end of the housing. In joining and fixing the left and right side plates 131S, the upper and lower upper surface plates 131U, and the lower surface plate 131D constituting the housing 130 in which the plate unit 110 is housed in this way, the housing shape is formed by pressing the left and right and upper and lower plates. After holding (step S120), first, these plates are joined and fixed by welding in an end joining region WA within a predetermined range from the casing end (step S130). Next, in the remaining area NWA other than the end bonding area WA and including the storage area TS of the plate unit 110, these plates are bonded and fixed to the plate contact portion using a pre-applied brazing material ( Step S140).

  When the heat exchanger 100 obtained in this way is welded and fixed to the other device TP with the end of the case 130 coming into contact with the other device TP shown in FIG. Propagates to the joint area WA. However, in the end joint area WA where heat at the time of welding propagates, since the joining and fixing of the plate is welding, there is no silver solder. Therefore, since remelting of the silver solder does not occur at the plate joint fixing portion (end joint area WA) of the casing 130 due to heat accompanying welding with the separate device TP, the heat exchanger 100 is replaced with the casing 130. It can be welded and fixed to another device TP without any problem. As a result, the separate device TP and the heat exchanger 100 already fixed to the separate device TP are firmly fixed by welding to form a mechanical element having high mechanical strength.

In this case, the heat when the housing 130 is welded and fixed to the separate device TP at the end thereof is propagated beyond the end joining area WA to the remaining area NWA. However, in the present reference example , since the end joint area WA is secured within a predetermined range, the heat capacity that propagates to the remaining area NWA can be reduced. Therefore, remelting of the silver wax in the remaining area NWA due to the propagated heat can be avoided with high effectiveness. The length of the end joint area WA is determined in consideration of the material and thickness of the upper and lower plates and the left and right plates constituting the housing 130, and the silver wax of the residual area NWA with the propagation heat capacity to the residual area NWA described above. What is necessary is just to determine so that remelting does not occur.

  Moreover, even if the above-mentioned propagated heat is transmitted to the plate unit 110 housed in the housing in the housing region TS included in the remaining region NWA, the housing region TS separated from the housing edge by the distance DL is the end joint. Since it is farther away from the edge of the housing than the area WA, the heat capacity propagating to the storage area TS becomes smaller. For this reason, it is possible to prevent re-melting of the brazing material joining and fixing portion in the plate unit 110 stored in the storage region TS, specifically, the silver solder on the top surface of the ridges in each plate. Therefore, it is possible to more reliably avoid a situation where the sealing performance of the flow path 150 in the plate unit 110 is lowered due to remelting of the brazing material.

Further, in this reference example , the bonding and fixing of the left and right and upper and lower plates of the housing 130 by welding in the end bonding area WA is performed before the bonding and fixing of the respective plates using the silver brazing in the remaining area NWA. went. For this reason, at the time of joining and fixing using the silver brazing in the remaining area NWA, since welding in the end joining area WA has already been completed, remelting of the silver brazing accompanying the welding can surely be avoided. . In this reference example , since silver brazing is applied in advance to the plate contact portion when the left and right, upper and lower plates of the housing 130 are joined, the silver brazing accompanying the welding in the end joining area WA is performed. It can be said that melting occurs. However, since the original silver brazing process (silver brazing and solidification) is performed after the welding in the end joining area WA, there is no problem even if the silver brazing is melted due to the welding in the end joining area WA. There is no.

Further, in this reference example , the plate unit 110 housed in the housing 130 has been joined and fixed in advance with silver brazing at the joint location (joint portion between the top surface of the ridge and the plate). In the situation where the right and left side plates 131S, the upper and lower upper surface plates 131U and the lower surface plate 131D of the housing 130 are pressed, that is, the plate unit 110 Was carried out under the condition of pressing in the laminating direction of the plates. For this reason, even if the heat accompanying the plate joining process in step S130 or step S140 is transmitted to the plate unit 110, there is the following advantage. That is, since the plate unit 110 receives the above-described heat in a state in which the plate unit 110 is pressed in the plate stacking direction, the plate unit 110 has already been bonded and fixed with silver solder, that is, the bonding state of the projection top surface and the plate bonding portion. The state of joining and fixing is maintained by pressing. Therefore, the sealing performance of the flow path 150 in the plate unit 110 can be maintained, which is preferable.

  Also, the brazing material used for joining the left, right, top and bottom plates of the housing 130 is a brazing material having a melting point lower than that of the brazing material (silver brazing) used for joining the heat transfer plate 116 of the plate unit 110. You can also. In this way, the brazing material (silver brazing) used for the joining process of the heat transfer plate 116 of the plate unit 110 is the joining process (brazing material melting / solidification) of the left and right, upper and lower plates of the casing 130 by the brazing material. Since it is not remelted by the heat at the time, the deterioration of the sealing performance of the flow path 150 in the plate unit 110 can be suppressed.

Next, a manufacturing process of another reference example of the heat exchanger 100 described above will be described. FIG. 5 is a process diagram showing a manufacturing process of another reference example of the heat exchanger 100, FIG. 6 is an explanatory diagram showing plate lamination and housing formation in the heat exchanger manufacturing process, and FIG. 7 is a heat exchanger manufacturing process. FIG. 8 is an explanatory view showing the state of pressing the plate in perspective view, FIG. 8 is an explanatory view showing the state of pressing the plate in the heat exchanger manufacturing process in a side view of the housing end, and FIG. 9 is the manufacturing process of the heat exchanger FIG. 10 is an explanatory view showing a state of the end welding fixing in the heat exchanger manufacturing process in a perspective view, and FIG. 11 is a perspective view showing the state of the end welding fixing in the heat exchanger manufacturing process. It is explanatory drawing which shows the mode of the plate press at the time of fixation by the silver solder in a container manufacturing process, and a housing | casing end part side and a cross-sectional view. In this reference example, although there is characterized by the formation of the plate units 110 in that simultaneously with the housing forming the structure of the heat exchanger 100 the resulting changes to that shown in FIG. 1 not.

As shown in FIG. 5, in the manufacturing process of this reference example, between the lower surface plate 131D and top plate 131U of the upper and lower for formation of the housing 130, stacking the plates constituting the plate unit 110 (step S200). That is, as shown in FIG. 6, the lower layer plate 115 and the heat transfer plate 116 are sequentially stacked in the storage region TS of the lower surface plate 131 </ b> D, and the upper surface plate 131 </ b> U is stacked on the uppermost heat transfer plate 116. The lowermost plate 115, the heat transfer plate 116, the upper and lower upper surface plates 131U and 131D of the upper and lower sides of the casing are all the same width, and the stacked plate unit 110, that is, the unloaded plate unit 110, The stacking dimension is higher than that of the side plate 131S. The height dimension of the side plate 131S allows for the amount of sinking when the plate unit 110 after stacking causes sinking of the plate whose stacking height is reduced through melting of the silver wax interposed between the plates. It is determined. Therefore, in the completed heat exchanger 100, as shown in FIG. 1, in the longitudinal direction, the side plate 131S sandwiches the upper surface plate 131U and the lower surface plate 131D at substantially the same height as the upper and lower end surfaces of the side plate. At the upper and lower ends of the side plate, the upper and lower end surfaces of the side plate are flush with the upper and lower plates. Alternatively, the lowermost layer plate 115 may be omitted, and the heat transfer plate 116 may be directly laminated on the lower surface plate 131D.

  As shown in FIG. 6, the heat transfer plate 116 includes multiple rows of grooves 117, and includes protrusions 118 on both sides and between the grooves in order to form these grooves. Therefore, by laminating the plurality of heat transfer plates 116, the grooves 117 of the heat transfer plates 116 are closed, and the flow path 150 described above is formed. In this case, silver solder is applied in advance to the top surface of the ridges 118 and the bottom surface of the lowermost layer plate 115 and the upper surface of the uppermost heat transfer plate 116 in each heat transfer plate 116. . Alternatively, a heat transfer plate 116 coated with silver brazing is prepared on the top surface of the ridge and laminated.

  The upper surface plate 131U and the lower surface plate 131D have a groove 132 extending in the width direction at a position away from the end portion of the plate corresponding to the above-described end portion joining area WA that is a plate welding range. The groove 132 divides the end bonding area WA and the remaining residual area NWA to relieve stress accompanying plate bonding described later, and details thereof will be described later.

  After the plate stacking in step S200, the top surface of the ridge 118 of the upper heat transfer plate 116 in the stacked upper and lower plates is the lower plate (the heat transfer plate 116 or the lowermost layer plate) facing this. 115). In this case, each ridge is joined to the plate with a coated silver solder interposed.

  Next, the side plates 131S on the left and right sides of the casing are brought into contact with the end surfaces of the upper and lower upper plate 131U and the lower plate 131D and the side surface of the plate unit 110, and the side plates 131S on the left and right sides of the casing and the upper and lower upper plates 131U. The bottom plate 131D is pressed to hold the housing shape (step S210). In this case, as shown in FIGS. 7 and 8, the upper and lower upper surface plates 131U and 131D of the upper and lower surfaces of the housing are pressed by the press P1 on the housing end side (that is, the end bonding area WA side). The storage area TS of the unit 110 is individually pressed by the press P2. The side plates 131S on the left and right sides of the housing are restrained from the left and right at appropriate locations by a jig (not shown) so as not to retreat during the joining process described later. As a result, the side plates 131S on the left and right sides of the casing, the upper and lower upper surface plates 131U and 131D surround the plate unit 110 on which the plates are stacked, abut against the peripheral walls, and form an outer casing as the casing. Since the height dimension of the side plate 131S allows for the sinking of the plate after the melting of the silver wax as described above, in the state of step S210, as shown in FIGS. 7 and 8, the upper surface plate 131U and the lower surface plate 131D abuts the upper and lower end surfaces of the side plate 131S leaving a step.

  Next, the upper surface plate 131U and the lower surface plate 131D are pressed by the press P1 (step S220). Accordingly, as shown in FIG. 9, the upper surface plate 131U and the lower surface plate 131D are bent at the location where the groove 132 is formed and enter the inside of the housing in the end joint region WA, and are flush with the upper and lower end surfaces of the side plate 131S. It becomes. During such pressing, the groove 132 acts to relieve the stress during bending of the two plates.

  Subsequent to step S220, using a welding torch, as shown in FIG. 10, the plate contact portion is fixed by welding over the range of the end joint region WA (step S230). As a result, a welding line WLA is formed at the plate contact portion in the end joint region WA. Thereafter, the upper and lower surface plates are pressed by the press P2 (step S240) and the joining process (step S250) is performed in this temperature environment in which the applied silver solder is melted while the plate pressing by the P1 is continued. Do it at the same time.

  The plate pressing in step S240 causes the plate unit 110 to sink and the upper surface plate 131U and the lower surface plate 131D to enter the inside of the housing as much as the silver solder interposed in step S200 is pressed between the plates. That is, by the plate pressing by the press P2, each heat transfer plate 116 constituting the plate unit 110 sinks by the amount corresponding to the amount protruding from the top surface due to the pressing of the silver solder interposed on the top surface of the ridge 118. Raises and the plate unit 110 sinks. The amount of subsidence as the plate unit 110 is the sum total of the above-mentioned subsidence in each plate of the heat transfer plate 116 supported by the ridges 118. In addition, the plate unit 110 causes the above-described sinking while being restrained in the width direction by both side plates 131S. The upper surface plate 131U and the lower surface plate 131D enter the inside of the housing in the remaining area NWA together with the above-described sinking of the plate unit 110, and are flush with the upper and lower end surfaces of the side plate 131S. Even when the upper and lower plates enter due to this pressing, the upper and lower plates are bent at the position where the groove 132 is formed, and the groove 132 works to relieve the stress when the plate is bent.

  The joining process in step S250 is performed in a state where the pressing by the press P2 in step S240 is received. For this reason, the contact position of the plate of the housing 130, specifically, the contact position of the side plates 131S, the upper surface plate 131U, and the lower surface plate 131D in the remaining area NWA, and the ridge 118 of each heat transfer plate 116 in the plate unit 110. The joint location on the top surface of the plate continues to be pressed by P2 during the joining process in step S250. Therefore, at these abutting / joining locations, joining and fixing with a silver cup is performed after melting of the silver solder applied to these joining surfaces and subsequent cooling.

  When the joining and fixing by the silver brazing is completed through the joining process of step S250, the restraint by the press P1 and the press P2 is released, and the jig (not shown) that presses the both side plates 131S so as not to move backward is also included. The pressing is released (step S260). Thereby, holding | maintenance of a housing | casing shape is also cancelled | released, a heat exchanger manufacturing process is complete | finished, and the heat exchanger 100 which is a final product is obtained. The heat exchanger 100 stores the plate unit 110 in a predetermined storage area TS in a housing 130 formed by four plates, upper, lower, left, and right.

As described above, according to the manufacturing method of the present reference example , the plate unit 110 having the multi-row flow paths 150 in layers can be manufactured simultaneously with the housing 130. For this reason, since the mechanical apparatus and manufacturing line for manufacture of the plate unit 110 can be omitted, it is preferable in terms of process integration, process management, and space saving of the manufacturing line. Further, even in the heat exchanger 100 obtained in the manufacturing process shown in FIG. 5, when the casing end face is joined to the separate device TP and the joint portion is welded and fixed as described above, the separate device TP is used. It is possible to avoid re-melting of the silver solder at the plate joining / fixing location (end joining area WA) of the housing 130 due to heat accompanying welding with the heat exchanger 100, and the heat exchanger 100 can be welded and secured to the other device TP without any trouble. As a result, the heat exchanger 100 and the separate device TP obtained in the manufacturing process shown in FIG. 5 are firmly fixed by welding to form a mechanical element with high mechanical strength.

Further, in this reference example , when forming and fixing the housing 130, the welding and fixing of the plate in the end bonding area WA (step S230) is preceded by the bonding and fixing of the plate in the remaining area NWA by silver solder (step S250). And the distance between the upper surface plate 131U and the lower surface plate 131D in the end joint region WA is reduced by an amount corresponding to the reduction in the stacking dimension of the plate unit 110 due to the pressing by the press P2, and the upper and lower plates are used as side plates. It was fixed to 131S by welding. For this reason, at the time of joining and fixing using silver brazing in the remaining area NWA, since welding in the end joining area WA has already been completed, joining and fixing using silver brazing in the remaining area NWA is performed. This can be performed without being affected by welding in the end joint area WA. In addition, in the joining and fixing using the silver solder in the remaining area NWA, the heat transfer plates 116 (specifically convex) are in a state in which the plate unit 110 is submerged by the pressing of the plate unit 110 by the press P2. The upper and lower plates and the upper and lower plates for forming the housing 130 are joined and fixed by silver solder. For this reason, after completion of the joining and fixing using the silver solder in the remaining area NWA, the upper surface plate 131U and the lower surface plate 131D can be made substantially the same height from the end joining area WA to the remaining area NWA. If the upper surface plate 131U and the lower surface plate 131D are fixed to the left and right side plates 131S at different heights in the end joint area WA and the remaining area NWA, the upper surface plate 131U and the lower surface plate 131D are inadequate. Although stress remains, in this reference example , such residual stress can be suppressed. For this reason, it is possible to effectively avoid the situation of peeling of the joint fixing portion due to careless residual stress.

In addition, in this reference example , since the end joining area WA and the remaining area NWA are partitioned by the grooves 132 in the upper surface plate 131U and the lower surface plate 131D, when the plates of the upper and lower surfaces of the end joining area WA are pressed by the press P1. The stress was relaxed in the groove 132. The same applies to pressing in the remaining area NWA by the press P2. Therefore, it is preferable that the upper surface plate 131U and the lower surface plate 131D after joining and fixing can further prevent the above-described peeling due to inadvertent residual stress.

Next, a description will be given real施例you welded to another device TP without surrounding the plate unit 110 in the housing 130. Figure 12 is an explanatory diagram showing a schematic configuration of a heat exchanger of the real施例. As shown in the figure, in this embodiment, the plate unit 110 itself becomes a heat exchanger, and when the plates are joined and fixed after laminating the plurality of heat transfer plates 116, as described above, in the end joining area WA. In the meantime, each plate was welded on the side surface, and in other regions, joining and fixing using silver solder were performed. In this case, the plate side surface welding in the end portion joining area WA was performed before the joining using the silver solder, and the plate side surface welding was performed in a state where the plate unit 110 was pressed from the plate stacking direction.

  In this case, a welding torch (not shown) may enter the flow path 150, and the flow path 150 in the range of the end joint area WA may also be formed by welding the ridge 118. Further, the ridge 118 in the range of the end joint area WA can be bonded and fixed by interposing silver brazing on the top surface in the same manner as the ridge 118 in other areas. Thus, even when the ridge 118 in the range of the end joint area WA is joined with silver solder, it is pressed during the plate side surface welding of the end joint area WA as described above. Even if the silver solder is melted, a joining process using silver brazing of the ridges 118 in a range other than the end joining area WA is performed after the plate side surface welding. Therefore, in the joining process, the end joining area WA is performed. Even in the ridge 118 in the range, since it is joined and fixed, there is no particular trouble.

  And even if it is a case where plate unit 110 itself is used as a heat exchanger, this heat exchanger can be welded to another apparatus TP without trouble. That is, since welding with the separate device TP is performed at the joint portion between the separate device TP and the end face of the plate unit 110, the plate side surface closest to the welding heat source at this time is already welded as described above. Due to the heat of welding with the separate device TP, no silver solder melting occurs on the side of the plate. Further, even if the heat of welding with the separate device TP is transmitted to the flow path 150 inside the plate unit in the end joint region WA, the amount of heat transmitted is reduced, so that the ridge 118 joined by the silver solder is peeled off. Can be suppressed. Alternatively, if welding with another device TP is performed under the condition where the plate unit 110 is pressed in the plate stacking direction in the end joint area WA, the heat inside the plate unit in the end joint area WA is temporarily caused by the heat of welding at this time. Even if the silver wax on the top surface of the ridge 118 is remelted, the bonded state is maintained by pressing, so that the sealability of the flow path 150 can be secured by cooling and solidifying the silver wax after remelting.

  The present invention is not limited to the above-described embodiments and modifications, and can be implemented in various modes without departing from the scope of the invention. For example, in the above-described embodiments, the stacking direction of the plates is the vertical direction, but the present invention can also be applied to a heat exchanger in which the plates are stacked in the horizontal direction. In addition, various types of brazing materials other than silver brazing can be used for joining and fixing the plates. For the plate unit 110 prepared in advance, the overlapping plates by the diffusion joining method, more specifically, the top surface of the ridge and the plate It is also possible to perform the joining and fixing.

  Further, the plate unit 110 and the heat transfer plate 116 constituting the plate unit 110 have been described as having a rectangular shape, but are not limited thereto. FIG. 13 is an explanatory diagram showing a schematic configuration of a heat exchanger 100A according to a modification. As shown in the drawing, in this modification, the plate unit 110A has a cylindrical outer shape, so that the housing 130A for housing the unit has a hollow cylindrical shape. In this case, the plate unit 110A includes a plurality of rows of flow paths 150 in a layered manner, and the housing 130A is formed by joining a semicircular arc-shaped upper surface plate 131UA and a lower surface plate 131DA. In the case 130A, the upper and lower plates are joined by welding in the end joining area WA to have a welding line WLA in the area, and the upper and lower plates are joined and fixed by silver solder in the remaining area NWA. To do.

  Even in the illustrated heat exchanger 100A, the upper and lower plates are welded and fixed in the end joint area WA at the end of the casing, so the end of the casing is joined to another device TP and fixed by welding. In this case, as described above, there is no problem in fixing the joint by the silver solder in the remaining area NWA.

  Further, the grooves 132 are formed in the upper surface plate 131U and the lower surface plate 131D so as to contribute to stress relaxation when the end joint area WA is pressed by the press P1, but the present invention is not limited to this. For example, the upper and lower surface plates can be made thin in the end joint area WA. In this way, since the thin plate is thin, the end joint area WA can be easily bent when pressed by the press P1, and the residual stress can be reduced. Can also be eased.

It is explanatory drawing which shows schematic structure of the heat exchanger 100 as a reference example of this invention. It is explanatory drawing which shows this heat exchanger 100 in front view from an edge part. FIG. 4 is a process diagram illustrating a manufacturing process of the heat exchanger 100. It is explanatory drawing which shows the mode of plate unit accommodation and housing | casing formation in a heat exchanger manufacturing process. It is process drawing which shows the manufacturing process of the other reference example of the heat exchanger. It is explanatory drawing which shows the mode of plate lamination | stacking and housing | casing formation in a heat exchanger manufacturing process. It is explanatory drawing which shows the mode of the plate press in a heat exchanger manufacturing process with a perspective view. It is explanatory drawing which shows the mode of the plate press in a heat exchanger manufacturing process by the housing | casing edge part side and a cross-sectional view. It is explanatory drawing which shows the mode of the plate press in the case of end part welding fixation in a heat exchanger manufacturing process by a cross-sectional view. It is explanatory drawing which shows the mode of the edge part welding fixation in a heat exchanger manufacturing process with a perspective view. It is explanatory drawing which shows the mode of the plate press at the time of fixation by the silver solder in a heat exchanger manufacturing process by the housing | casing edge part side and a cross-sectional view. It is an explanatory diagram showing a schematic configuration of the heat exchanger of the real施例. It is explanatory drawing which shows schematic structure of 100 A of heat exchangers of a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100, 100A ... Heat exchanger 110, 110A ... Plate unit 115 ... Bottom layer plate 116 ... Heat transfer plate 117 ... Groove 118 ... Projection 130, 130A ... Housing 131D ... Bottom plate 131DA ... Bottom plate 131S ... Side plate 131U ... Top plate 131UA ... Top plate 132 ... Groove 150 ... Flow path P ... Hydraulic power source P1 ... Press P2 ... Press DL ... Distance TP ... Different equipment TS ... Storage area WLA ... Welding line WA ... End joint area NWA ... Remaining area

Claims (3)

A method of manufacturing a laminate that is bonded to another component through heat treatment,
A plurality of plates having multi-row ridges that form grooves are laminated, and the plate joining portion between the laminated plates is a top surface of the ridges, and the top surface is joined by a brazing material. A first joining step of joining the plates to form a laminate;
In a predetermined range of the plate joining portion between the plates from the one end side end surface of the laminate that is joined to the other component member, the heat treatment is performed at a higher temperature than the joining process using the brazing material. and a second bonding step of junction at each ridge top surface of the ridges of the multi-row to the plate to each other by a joining process by welding,
The laminated body is subjected to plate lamination so that the joining using the brazing material in the first joining step and the welding in the second joining step are joined to the plate on the lower side of the top surface of the ridge. Execute in the situation of pressing from the direction,
The plate joint location between the plates in the predetermined range from the one end surface portion of the laminate subjected to the joint treatment by welding and the plate joint location between the plates subjected to the joint treatment using the brazing material are continuous. A method for producing a laminate, characterized by comprising:   The manufacturing method of the laminated body of Claim 1 which performs the joining process by the said welding in a said 2nd joining process before the joining process using the said brazing material of the said 1st joining process. It is a manufacturing method of the layered product according to claim 1 or 2,
As a step subsequent to the first and second joining steps, the laminate and the other constituent member are joined to each other at one end surface portion of the laminate, which is a joint location between the laminate and the joint. The manufacturing method of a laminated body provided with the 3rd joining process performed by welding in a periphery.

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