JP4970795B2 - Heat exchanger manufacturing jig and heat exchanger manufacturing method using the manufacturing jig - Google Patents

Description

  The present invention relates to a manufacturing jig for manufacturing a heat exchanger including a tube and a header tank, and a heat exchanger manufacturing method using the manufacturing jig.

  Conventionally, for example, as disclosed in Patent Document 1, as a heat exchanger used in an air conditioner, a large number of flat tubes are arranged side by side in the thickness direction, and both end portions of these tubes are arranged. A pair of header tanks communicating with the tube is also known. In the peripheral wall portion of the header tank of this heat exchanger, a number of slit-like tube insertion holes into which the end portions of the tubes are inserted are formed corresponding to the intervals of the tubes. With the end of the tube inserted into these tube insertion holes, the peripheral edge of the tube insertion hole and the outer surface of the tube are brazed.

  Further, in Patent Document 1, as a manufacturing method of the heat exchanger, after inserting the end of the tube into the tube insertion hole of the header tank and before entering the brazing process, the jig is used to It is disclosed that the diameter of the end is increased. Thereby, the outer surface of the tube can be brought into close contact with the peripheral edge portion of the tube insertion hole, and liquid-tight brazing can be performed in the subsequent brazing step.

Further, for example, as disclosed in Patent Document 2, a flat tube of a heat exchanger is formed by a roll forming method. The tube of Patent Document 2 is provided with a middle column portion that connects portions facing each other in the thickness direction on the inner surface of the tube at a substantially central portion in the width direction. By providing this middle column part, the rigidity of the tube can be improved, and accordingly, the thickness of the plate material constituting the tube can be reduced to reduce the material cost, and the weight of the heat exchanger can be reduced. it can.
JP 2000-176777 A Japanese Patent Laid-Open No. 10-305341

  By the way, when manufacturing the tube of Patent Document 2, generally, first, a plate material is roll-formed so as to be a long tube having a cross-sectional shape of the tube and a length of a plurality of tubes. . Then, this long tube is cut | disconnected to the length of a tube with a cutting blade, and a tube is obtained.

  However, when the cutting blade that has entered the long tube hits the middle column portion when the long tube is cut by the cutting blade, the middle column portion is pushed in the penetration direction by the cutting blade and is displaced and displaced. There is. If the center column is displaced from the design position in this way, the rigidity of the tube may not be ensured. Therefore, it is necessary to correct the center column to the design position before the brazing process. As a result, the number of manufacturing steps increases.

  The present invention has been made in view of such a point, and the object of the present invention is that the diameter of the tube is increased by a jig after the end of the tube is inserted into the tube insertion hole of the header tank. Focusing on the above, when a tube with a middle pillar part is obtained by roll forming, heat exchange can be performed by making it possible to correct the middle pillar part using a jig that expands the end of the tube. An object of the present invention is to ensure the rigidity of the tube while avoiding an increase in the number of manufacturing steps of the vessel.

  In order to achieve the above object, in the invention of claim 1, as an invention of a jig for manufacturing a heat exchanger, an insertion portion inserted into an end portion of a tube is provided with an enlarged diameter portion and a middle column guide portion. Provided.

Specifically, it comprises a roll-formed flat tube and a header tank that is disposed at the end of the tube and communicates with the tube, and the tube has portions facing each other on the inner surface of the tube. A middle column portion extending so as to be connected is provided, and the outer surface of the tube and the peripheral edge portion of the tube insertion hole are brazed with the end portion of the tube inserted into the tube insertion hole formed in the header tank. A manufacturing jig used for manufacturing a heat exchanger is provided with an insertion portion that is inserted into an end portion of the tube, and the insertion portion is inserted into the end portion of the tube. The base portion formed so as to protrude from the end portion of the tube is continuous, and a diameter-enlarged portion for expanding the end portion of the tube is provided on the base side of the insertion portion, A middle column guide portion for guiding a portion corresponding to the end of the tube in the middle column portion to the design position is provided on the distal end side in the insertion direction with respect to the enlarged diameter portion in the insertion portion. A cutout portion that opens to the distal end side in the insertion direction is formed, and a portion corresponding to the end portion of the tube in the middle column portion is inserted into the middle portion of the middle column portion guide portion, extending toward the base portion. A slit is continuously formed, and the end portion on the base side of the slit is located at a boundary portion between the insertion portion and the base portion, and the insertion portion is completely inserted into the end portion of the tube. It is set as the structure currently formed in contact with the site | part corresponding to the edge part of the tube in the said middle pillar part.

  According to this configuration, when the heat exchanger is manufactured, the end of the tube is inserted into the tube insertion hole of the header tank, and then the insertion portion of the jig is inserted into the end of the tube. The diameter of the end portion of the tube can be increased by the diameter portion, and when the middle column portion is displaced, the middle column portion can be corrected by the middle column portion guide portion.

  Further, by grasping the base portion of the jig, the insertion portion can be surely inserted to the end portion of the tube up to a predetermined position.

  Also, as the jig insertion part is inserted into the end of the tube, the middle column part of the tube comes into contact with the contact part and the insertion part no longer moves in the insertion direction. The relative position of can be made constant.

  In the invention of claim 2, in the invention of claim 1, the distal end portion of the insertion portion is formed to be smaller than the inner shape of the end portion of the tube.

  According to this configuration, when the insertion portion is inserted into the end portion of the tube, even if the center of the insertion portion and the center of the end portion of the tube are slightly deviated within an error range when viewed in the insertion direction, The tip can be easily inserted into the end of the tube.

  In the invention of claim 3, as an invention of a heat exchanger manufacturing method, a jig is inserted into the end of the tube after being inserted into the tube insertion hole, and the diameter of the end of the tube is expanded by this jig. The middle column was corrected.

Specifically, a flat tube and a header tank that is disposed at an end of the tube and communicates with the tube are provided, and the tube extends so as to connect portions facing each other on the inner surface of the tube. A heat formed by brazing the outer surface of the tube and the peripheral portion of the tube insertion hole in a state in which the middle column portion is provided and the end portion of the tube is inserted into the tube insertion hole formed in the header tank. In the manufacturing method of the exchanger, a long tube forming step of forming a plate material into a long tube having a cross-sectional shape of the tube and a length of a plurality of the tubes, and the long tube A cutting step of cutting the length tube into the length of the tube with a cutting blade to obtain the tube, and an assembly work for inserting the end of the tube obtained in the cutting step into the tube insertion hole of the header tank And after the assembly step, a jig is inserted into the end of the tube, the diameter of the end of the tube is increased by the jig, and a portion corresponding to the end of the tube in the middle column is formed. An end molding step to be a design position, and a brazing step for brazing the outer surface of the tube and the tube insertion hole after the end molding step, and a jig used in the end molding step, An insertion portion that is inserted into the end portion of the tube, and a base portion that is formed to be continuous with the insertion portion and protrudes from the end portion of the tube in a state where the insertion portion is inserted into the end portion of the tube. In the end molding step, the middle column portion is guided to the design position by the notch portion provided on the distal end side in the insertion direction with respect to the enlarged diameter portion in the insertion portion, and then the base portion side of the notch portion from the base side. In the slit extending toward the base, the above The portion corresponding to the end portion of the tube in the column portion is inserted, and the end portion of the tube is expanded by the enlarged diameter portion provided on the base side in the insertion portion, and then the insertion portion is inserted into the end of the tube. A portion corresponding to the end portion of the tube in the middle column portion is brought into contact with the end portion of the slit located at the boundary portion between the insertion portion and the base portion.

  According to this configuration, after inserting the end portion of the tube into the tube insertion hole of the header tank, the diameter of the end portion of the tube is increased by simply inserting the jig into the end portion of the tube. It becomes possible to correct.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the end portion forming step is configured to simultaneously insert jigs into the end portions of the plurality of tubes.

  According to this configuration, when manufacturing a heat exchanger having a plurality of tubes, it is possible to simultaneously correct the middle pillars at the ends of these tubes.

  According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, in the end portion forming step, jigs are simultaneously inserted into both end portions of the tube.

  According to this structure, it becomes possible to correct | amend the middle pillar part located in the both ends of a tube simultaneously.

  According to the first aspect of the present invention, since the enlarged diameter portion and the middle column guide portion are provided in the jig insertion portion, the diameter of the end portion of the tube inserted into the tube insertion hole of the header tank is increased. Thus, when the outer surface of the tube is brought into close contact with the peripheral edge portion of the tube insertion hole, the middle column portion can be corrected. As a result, the rigidity of the tube can be ensured with the middle column portion as the design position while avoiding an increase in the number of manufacturing steps.

  In addition, since the base portion is provided in the jig, the insertion portion can be surely inserted to a predetermined position by gripping the base portion, and the middle column portion can be reliably corrected.

  Also, as the jig insertion part is inserted into the end of the tube, the abutment part comes into contact with the middle column part, so that the relative position between the tube and the jig can be kept constant. It is possible to reduce the variation in the diameter expansion amount and the variation in the position of the middle column portion.

  According to the invention of claim 2, since the distal end portion of the insertion portion is made smaller than the inner shape of the end portion of the tube, the insertion portion can be easily inserted into the end portion of the tube.

  According to the invention of the third aspect, similarly to the invention of the first aspect, it is possible to secure the rigidity of the tube with the middle column portion as the design position while avoiding an increase in the number of manufacturing steps.

  According to invention of Claim 4, when manufacturing the heat exchanger which has a some tube, since the center pillar part of the edge part of these tubes can be corrected simultaneously, it can avoid the increase in a manufacturing man-hour. it can.

  According to invention of Claim 5, since the center pillar part located in the both ends of a tube can be corrected simultaneously, the increase in a manufacturing man-hour can be avoided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows a heat exchanger 1 according to an embodiment of the present invention. The heat exchanger 1 is a heat exchanger for an air conditioner housed in a casing (not shown) of an air conditioner mounted on a vehicle, and specifically, a heater core for air heating or an air cooling device. It is used as an evaporator.

  The heat exchanger 1 includes a core 4 in which a plurality of tubes 2 and fins 3 are alternately arranged, and a first header tank 6 and a second header tank 7 provided at both ends of the core 4 in the longitudinal direction of the tube 2. It has. Air sent from a blower (not shown) of the air conditioner passes through the core 4, and the flow direction of the air intersects the direction in which the tubes 2 are arranged.

  The said tube 2 is a flat tube formed by shape | molding the board | plate material made from an aluminum alloy so that it may have a cross-sectional shape long in the air flow direction by a roll forming method. The plate material constituting the tube 2 is a clad material in which brazing materials are provided in layers on both sides. As shown in FIGS. 2 and 3, the tube 2 includes a peripheral wall portion 10 that constitutes the flow path R of the heat exchange medium, and a middle pillar portion 11 that is located in the peripheral wall portion 10 and has a substantially U-shaped cross section. Has been. One side wall portion 10a located on one side in the thickness direction of the tube 2 in the peripheral wall portion 10 extends substantially flat. A first end wall portion 10b and a second end wall portion 10c extending in the thickness direction of the tube 2 are connected to one end portion and the other end portion in the width direction of the tube 2 in the one side wall portion 10a. The first end wall portion 10 b and the second end wall portion 10 c are formed so as to bend toward the outside of the tube 2. A first other side wall portion 10d is connected to the other side in the thickness direction of the tube 2 in the first end wall portion 10b. The first other side wall portion 10 d extends substantially flat up to a substantially central portion in the width direction of the tube 2. A second other side wall portion 10e is connected to the other side in the thickness direction of the tube 2 in the second end wall portion 10c. The second other side wall portion 10e extends substantially flat up to a position corresponding to the center portion in the width direction of the tube 2, that is, the end portion of the first other side wall portion 10d. The middle column part 11 is integrally formed at the end of the second other side wall part side 10e in the first other side wall part 10d.

  The middle column part 11 is continuous over both longitudinal ends of the tube 2 and is formed so as to extend along the inner surface of the second other side wall part 10e from the end part of the first other side wall part 10d. A portion 11a, a vertical plate portion 11b extending from the first joint portion 11a toward the one side wall portion 10a, and an end portion of the vertical plate portion 11b on the side wall portion 10a side along the inner surface of the one side wall portion 10a. It is comprised with the 2nd junction part 11c formed so that it might extend to the said 1st end wall part 10b side.

  A step portion 13 is formed in the boundary portion between the first other side wall portion 10d and the first joint portion 11a so as to be recessed inward of the tube 2, and an end portion of the second other side wall portion 10e is formed in the step portion 13. Is supposed to be located. The depth of the stepped portion 13 is set to be substantially the same as the thickness dimension of the plate material constituting the tube 2, and the end of the second other side wall portion 10e is substantially flush with the first other side wall portion 10d. It can be positioned.

  The first joint portion 11a is brazed to the inner surface of the second other side wall portion 10e. Thereby, the flow path R of the tube 2 is configured. The second joint portion 11c is brazed to the inner surface of the one side wall portion 10a. Thereby, the mutually opposing parts in the inner surface of the peripheral wall part 10 will be in the state connected by the middle pillar part 11. FIG.

  On the other hand, as shown in FIG. 1, the fin 3 is a corrugated fin formed by forming an aluminum alloy plate so as to have a waveform when viewed from the direction of air flow. It extends. The thickness of the plate material constituting the fin 3 is set to be thinner than the plate material constituting the tube 2. The separation distance between adjacent tubes 2 corresponds to the dimension of the fin 3 in the vehicle left-right direction, and the fin 3 is brazed to the outer surface of the adjacent tube 2.

  The first header tank 6 is formed in a cylindrical shape extending straight in the direction in which the tubes 2 and the fins 3 are arranged, and the inner plate member 20 located on the core 4 side, and the opposite side of the inner plate member 20 from the core 4 The outer plate member 21 located at the end and the closing member 22 that closes the openings at both ends are combined. The inner plate member 20 and the outer plate member 21 are formed by press-molding a clad material in which a brazing material is provided on both surfaces of an aluminum alloy plate.

  The inner plate member 20 is formed to have a substantially U-shaped cross section that opens to the outside of the core 4 when viewed in the direction in which the tubes 2 and the fins 3 are arranged. As shown in FIG. 4, a slit-like tube insertion hole 20 b is formed in the core side plate portion 20 a of the inner plate member 20 at a portion corresponding to the interval between the tubes 2 of the core 4. A space between adjacent tube insertion holes 20b in the core side plate portion 20a is formed so as to bulge outward from the first header tank 6. Each tube 2 is held by being brazed to the peripheral edge portion of the tube insertion hole 20b in a state of being inserted into the corresponding tube insertion hole 20b.

  The outer plate member 21 is formed so as to have a substantially U-shaped cross section that opens to the core 4 side as viewed in the direction in which the tubes 2 and the fins 3 are arranged and is fitted to the inner plate member 20. The contact portion between the outer plate member 21 and the inner plate member 20 is brazed. Further, the closing member 22 is brazed to the inner plate member 20 and the outer plate member 21. The second header tank 7 is a combination of the inner plate member 20, the outer plate member 21, and the closing member 22, similarly to the first header tank 6.

  As shown in FIG. 1, the first header tank 6 is connected with an inflow pipe 24 for allowing the heat exchange medium to flow in, and the second header tank 7 has an outflow pipe 25 for allowing the heat exchange medium to flow out. It is connected. Accordingly, the heat exchange medium flowing into the first header tank 6 from the inflow pipe 24 is distributed to the tubes 2 and flows through the tubes 2, and at this time, the heat exchange medium exchanges heat with the external air. The heat exchange medium flowing in the tube 2 gathers in the second header tank 7 and flows out from the outflow pipe 25 to the outside.

  Next, the structure of the manufacturing jig 50 used when manufacturing the heat exchanger 1 configured as described above will be described with reference to FIG. The jig 50 is for molding the end of the tube 2 inserted into the tube insertion holes 20b of the first header tank 6 and the second header tank 7, and is a metal material harder than the plate material constituting the tube 2. Is formed into a substantially rectangular plate shape.

  The jig 50 protrudes from the end portion of the tube 2 in a state where the insertion portion 51 is inserted into the end portion of the tube 2 and the insertion portion 51 is inserted into the end portion of the tube 2 (shown in FIG. 7). The base 52 is formed in such a manner that the insertion portion 51 and the base 52 are integrally formed.

  The dimension of the base 52 in the width direction is set to be substantially the same as the inner dimension of the tube 2 in the width direction. At both ends in the width direction of the base portion 52, curved surface portions 52a that curve outward and extend in the insertion direction are provided. The shapes of the curved surface portions 52a are substantially the same as the inner surface shapes of the first end wall portion 10b and the second end wall portion 10c of the tube 2. The thickness dimension of the base 52 is set to be longer than the thickness dimension of the tube 2 except for the curved surface portion 52a. Both side surfaces 52b of the base 52 are formed substantially flat.

  As shown in FIG. 5B, a curved surface portion 51a configured by a curved surface is provided at the distal end portion of the insertion portion 51 in the insertion direction. The dimension in the width direction of the curved surface portion 51 a is set shorter than the inner dimension in the width direction of the tube 2. Therefore, the shape of the distal end portion of the insertion portion 51 is smaller than the inner shape of the end portion of the tube 2. It has become.

  An intermediate portion 51 b having a thickness dimension set shorter than the thickness dimension of the base portion 52 is provided closer to the base portion 52 than the curved surface portion 51 a of the insertion portion 51. The thickness dimension of the intermediate portion 51b is set to be substantially the same as the inner dimension of the tube 2 in the thickness direction. As shown in FIG. 5C, the width direction both ends of the intermediate portion 51b are set to be longer toward the base 52 side, and are inclined with respect to the insertion direction.

  A diameter-expanding part 51c for expanding the diameter of the end of the tube 2 is provided closer to the base 52 than the intermediate part 51b of the insertion part 51. The dimension in the width direction of the enlarged diameter part 51c is set to be substantially the same as the dimension in the width direction of the base part 52, that is, the inner dimension in the width direction of the tube 2. Both ends in the width direction of the enlarged diameter portion 51 c have the same shape as the curved surface portion 52 a of the base portion 52. Both side surfaces of the enlarged diameter portion 51c extend from the side surface of the intermediate portion 51b to the side surface 52b of the base portion 52. As shown in FIG. 5B, the difference between the thickness of the intermediate portion 51b and the thickness of the base portion 52 is caused. It is inclined with respect to the insertion direction so as to correspond.

  As shown in FIG. 5C, a substantially V-shaped cutout 51d that opens to the distal end side is formed at the center in the width direction of the insertion portion 51. The notch 51d is a middle pillar guide for guiding the middle pillar 11 of the tube 2 to the design position, and is formed in a region from the curved surface 51a to the middle 51b of the insertion part 51.

  The base 52 side of the notch 51 d is located in the center in the width direction of the insertion portion 51, which is a portion corresponding to the design position of the middle pillar portion 11 of the tube 2. A slit 51e extending in the insertion direction toward the base 52 is continuous with the base 52 side of the notch 51d. The slit 51e is formed in the enlarged diameter portion 51c of the insertion portion 51. The width of the slit 51e is set to be slightly wider than the thickness dimension of the middle column portion 11, and the middle column portion 11 enters as shown by a virtual line. The end of the slit 51e on the base 52 side is located at the boundary between the insertion portion 51 and the base 52, and the insertion portion 51 is in contact with the middle column portion 11 in a state where the insertion portion 51 is completely inserted into the end of the tube 2. It is formed to touch. The end of the slit 51e on the base 52 side constitutes the contact portion 51f of the present invention.

  The jig 50 configured as described above is attached to a jig holding member 55 as shown in FIG. The jig holding member 55 is composed of a prism member extending in the direction in which the tubes 2 are arranged. On one side surface of the jig holding member 55, the jig 50 is arranged in the same number as the number of the tubes 2 of the heat exchanger 1 with an interval corresponding to the interval of the tubes 2. The base portion 52 of the jig 50 is held by one side surface of the jig holding member 55, and the jig 50 is in a state of standing in the insertion direction. The curved surface portions 51a of these jigs 50 are arranged on the same plane orthogonal to the insertion direction. A moving mechanism (not shown) for moving the jig holding member 55 in the insertion direction of the jig 50 is connected to the jig holding member 55. This moving mechanism has a known structure composed of an actuator using fluid pressure. In this embodiment, a jig holding member 55 to which a jig 50 for forming one end of the tube 2 is attached and a jig holding member 55 to which a jig 50 for forming the other end is attached are prepared. These are the same structure.

  Next, the manufacturing procedure of the heat exchanger 1 will be described. First, each constituent member is formed. When the tube 2 is formed, first, a plate material is a long tube L having a cross-sectional shape of the tube 2 and a length dimension corresponding to a plurality of the tubes 2 (indicated by phantom lines in FIG. 2). Roll-form so that This is a long tube forming process.

  After the long tube forming step, the long tube L is cut into the length of the tube 2 by using the rotary cutting blade A as shown by a virtual line in FIG. This is a cutting process, and in this cutting process, the cutting blade A is intruded from one side in the width direction of the long tube L and moved to the other side, as indicated by a white arrow. In the middle of moving the cutting blade A, the cutting blade A comes into contact with the portion corresponding to the middle column portion 11 of the long tube L, and the portion corresponding to the middle column portion 11 corresponds to the cutting blade A. When pushed in the intrusion direction, it is displaced as shown in FIG.

  The core 4 is configured by alternately arranging the tubes 2 and the fins 3 obtained through the cutting step. After the tubes 2 and the fins 3 are bound and integrated with a binding tool (not shown), the end of the tube 2 is inserted into the tube insertion hole 20b of the inner plate member 20 as shown in FIG. This is the assembly process.

  After the assembly step, the end of each tube 2 and the curved surface 51a of the jig 50 of the jig holding member 55 are made to face each other. Thereafter, when the jig holding member 55 is moved in the insertion direction by the moving mechanism, the jig 50 is inserted into the end portion of the tube 2 from the curved surface portion 51a. At this time, since the curved surface portion 51a is smaller than the inner shape of the end portion of the tube 2, the center of the jig 50 and the center of the end portion of the tube 2 are slightly shifted from each other within an error range as viewed in the insertion direction. Even if it is, it becomes possible to insert the front-end | tip part of the insertion part 51 in the edge part of the tube 2 easily. Further, since both end portions in the width direction of the intermediate portion 51b of the jig 50 are inclined with respect to the insertion direction, this also facilitates insertion of the jig 50.

  When the jig 50 is inserted into the end portion of the tube 2, when the middle column portion 11 of the tube 2 is displaced from the central portion in the width direction of the tube 2, which is the design position, it hits the inner surface of the notch 51 d and the design position. The design position is approached as the amount of insertion increases. Before the jig 50 is completely inserted, the middle column portion 11 enters the slit 51e formed in the enlarged diameter portion 51c, and thereby, at the end portion of the tube 2 in the middle column portion 11 as shown in FIG. The position of the corresponding part becomes the design position, and the shape becomes a shape extending in the longitudinal direction of the tube 2, and the middle column part 11 is corrected. As the jig 50 is further inserted, the middle column portion 11 comes into contact with the contact portion 51f from the insertion direction, and the relative position between the tube 2 and the jig 50 is determined. As described above, since the abutting portion 51f is brought into contact with the middle pillar portion 11 after the correction, the relative position between the tube 2 and the jig 50 is determined. It is possible to make the position always constant with high accuracy.

  Further, when the enlarged diameter portion 51c of the jig 50 is inserted into the end portion of the tube 2, one side wall portion 10a and the first other side wall portion among the end portions of the tube 2 by both side surfaces of the enlarged diameter portion 51c. 10d and the 2nd other side wall part 10e are pushed outward, and the edge part of the tube 2 is diameter-expanded. The diameter expansion of the end portion of the tube 2 is performed simultaneously with the correction of the middle column portion 11 described above. On the other hand, since the dimension in the width direction of the diameter-enlarged portion 51c is substantially the same as the inner dimension in the width direction of the tube 2, the first end wall portion 10b and the second end wall portion 10c of the tube 2 are designed without being expanded. Become a shape. By these things, the outer peripheral surface of the edge part of the tube 2 closely_contact | adheres to the peripheral part of the tube insertion hole 20b. The end portion forming step of the present invention includes a step of correcting the above-described middle column portion 11 to a design position and a step of expanding the end portion of the tube 2. In this end portion forming step, since the number of jigs 50 is the same as the number of tubes 2, the ends of all the tubes 2 are formed at a time. Further, in the end forming step, the two jig holding members 55 are moved simultaneously in the insertion direction of the jig 50. Thereby, both ends of the tube 2 can be formed at a time. Note that the two jig holding members 55 may be moved after one is moved without being moved at the same time.

  After the end forming step, the outer plate member 21 and the closing member 22 are assembled to the inner plate member 20 to form the header tanks 6 and 7, and the inflow pipe 24 and the outflow pipe 25 are fixed to the header tanks 6 and 7. . These integrated members are heated in a heating furnace (not shown) to a temperature equal to or higher than the melting temperature of the brazing material, and the respective parts are brazed. This is the brazing process. In this brazing process, since the middle pillar portion 11 of the tube 2 is corrected in the end molding step, the second joint portion 11c of the middle pillar portion 11 is brazed to the one side wall portion 10a as intended. Thus, the portions of the inner surface of the tube 2 that face each other in the thickness direction are connected. Thereby, the highly rigid tube 2 is obtained. Further, since the end portion of the tube 2 is enlarged in diameter and the outer surface is brought into close contact with the peripheral portion of the tube insertion hole 20b, the end portion of the tube 2 is liquid-tightly brazed to the peripheral portion of the tube insertion hole 20b. And the occurrence of defective products is suppressed.

  As described above, according to this embodiment, the enlarged-diameter portion 51c that enlarges the end of the tube 2 and the notch 51d that guides the middle column portion 11 that is displaced at the time of cutting to the design position are provided. Since the heat exchanger 1 is manufactured using the jig 50, the diameter of the end of the tube 2 inserted into the tube insertion hole 20b is expanded so that the outer surface of the tube 2 is the peripheral edge of the tube insertion hole 20b. When making it adhere to a part, the correction | amendment operation | work of the middle pillar part 11 can be performed. Thereby, the rigidity of the tube 2 can be ensured by setting the middle column portion 11 to the design position while avoiding an increase in the number of manufacturing steps.

  Further, since the base portion 52 is provided in the jig 50, the insertion portion 51 can be reliably inserted into the end portion of the tube 2 to a predetermined position by gripping the base portion 52.

  Further, when the jig 50 is inserted into the end portion of the tube 2, the contact portion 51f comes into contact with the middle column portion 11, so that the relative position between the tube 2 and the jig 50 can be made constant. The variation in the diameter expansion amount at the end portion 2 and the variation in the position of the middle column portion 11 can be reduced.

  Further, since the curved surface portion 51 a of the insertion portion 51 is made smaller than the inner shape of the end portion of the tube 2, the insertion portion 51 can be easily inserted into the end portion of the tube 2.

  In addition, since the jig 50 is held by the jig holding member 55 as many as the number of the tubes 2, when manufacturing the heat exchanger 1 having a plurality of tubes 2, The column part 11 can be simultaneously guided to the design position, and an increase in the number of manufacturing steps can be avoided.

  Further, since the two jig holding members 55 are easily moved simultaneously, both end portions of the tube 2 can be simultaneously set to the design positions, and an increase in the number of manufacturing steps can be avoided.

  As described above, the heat exchanger manufacturing jig and the heat exchanger manufacturing method according to the present invention are suitable for manufacturing a heat exchanger of a vehicle air conditioner, for example.

It is a front view of the heat exchanger manufactured using the manufacturing method concerning the embodiment of the present invention. It is a perspective view of a tube. It is an end view of a tube. It is a figure which shows the cross section of a core and an inner side plate member before entering an edge part formation process in the state which inserted the edge part of the tube in the tube insertion hole, and a jig | tool and a jig holding member. (A) is the figure which looked at the jig | tool from the insertion direction front end side, (b) is the figure which looked at the jig from the width direction, (c) is the figure which looked at the jig from the side. FIG. 4 is a view corresponding to FIG. 3 in a state in which the middle column portion is displaced from the design position in the cutting process. FIG. 5 is a view corresponding to FIG. 4 during the end forming step.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Tube 3 Fin 6 1st header tank 7 2nd header tank 11 Middle pillar part 20b Tube insertion hole 50 Jig 51 Insertion part 51c Expanded diameter part 51d Notch part (Medium pillar part guide part)
51f Contact part 52 Base 55 Jig holding member A Cutting blade L Long tube

Claims (5)

A roll-formed flat tube and a header tank disposed at an end of the tube and communicating with the tube are provided, and the tube extends so as to connect portions facing each other on the inner surface of the tube. Heat exchange in which a column part is provided and the outer surface of the tube and the peripheral edge of the tube insertion hole are brazed in a state where the end of the tube is inserted into the tube insertion hole formed in the header tank In the manufacturing jig used when manufacturing the vessel,
An insertion portion that is inserted into an end portion of the tube, and a base portion that is formed so as to protrude from the end portion of the tube in a state where the insertion portion is inserted into the end portion of the tube; Is continuous,
The base portion side of the insertion portion is provided with a diameter-expanding portion that expands the end portion of the tube. Is provided with a middle column guide portion that guides a portion corresponding to the design position, the middle column guide portion is formed by a notch that opens to the distal end side in the insertion direction,
A slit that extends toward the base and into which a portion corresponding to the end of the tube in the middle pillar is inserted is continuously formed on the base side of the middle pillar guide part,
The end portion on the base side of the slit is located at the boundary portion between the insertion portion and the base portion, and the end of the tube in the middle column portion is in a state where the insertion portion is completely inserted into the end portion of the tube. It is formed so that it may contact | abut to the site | part corresponding to a part , The jig for manufacture of the heat exchanger characterized by the above-mentioned. In the heat exchanger manufacturing jig according to claim 1,
A jig for manufacturing a heat exchanger, wherein a distal end portion of an insertion portion is formed smaller than an inner shape of an end portion of a tube. A flat tube and a header tank disposed at an end of the tube and communicating with the tube are provided, and the tube is provided with a middle column portion extending so as to connect mutually facing portions on the inner surface of the tube. And a heat exchanger manufacturing method in which the outer surface of the tube and the peripheral edge of the tube insertion hole are brazed with the end of the tube inserted into the tube insertion hole formed in the header tank In
A long tube forming step of roll-forming a plate material so as to be a long tube having a cross-sectional shape of the tube and a plurality of lengths of the tube;
A cutting step of obtaining the tube by cutting the long tube into the length of the tube with a cutting blade;
An assembly step of inserting the end of the tube obtained in the cutting step into the tube insertion hole of the header tank;
After the assembling step, a jig is inserted into the end of the tube, the diameter of the end of the tube is increased by the jig, and a portion corresponding to the end of the tube in the middle post is designed. An end molding process to
A brazing step of brazing the outer surface of the tube and the tube insertion hole after the end molding step;
The jig used in the end molding step is formed so as to be continuous with the insertion portion inserted into the end portion of the tube and the insertion portion, and the insertion portion is inserted into the end portion of the tube. And a base protruding from the end of the tube.
In the end portion molding step, the middle column portion is guided to the design position by a notch portion provided on the distal end side in the insertion direction with respect to the enlarged diameter portion in the insertion portion, and thereafter, from the base side of the notch portion toward the base portion. A portion corresponding to the end portion of the tube in the middle column portion is inserted into the extending slit, and the end portion of the tube is expanded by the enlarged diameter portion provided on the base side in the insertion portion, and then the insertion is performed. The part corresponding to the end of the tube in the middle column part is brought into contact with the end of the slit located at the boundary between the insertion part and the base by completely inserting the part into the end of the tube The manufacturing method of the heat exchanger characterized by these. In the manufacturing method of the heat exchanger of Claim 3,
In the end forming step, a jig is inserted into the ends of a plurality of tubes at the same time. In the manufacturing method of the heat exchanger of Claim 3 or 4,
In the end forming step, a jig is inserted into both ends of the tube at the same time.

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