JP7443935B2 - Heat exchanger caulking device and heat exchanger caulking method - Google Patents

Description

The present invention relates to a heat exchanger caulking device and a heat exchanger caulking method for attaching a heat exchanger core plate to a tank.

As described in Patent Document 1, a heat exchanger includes a core portion that performs heat exchange, an inlet tank, and an outlet tank. The core portion is provided between the inlet tank and the outlet tank, and each tank is configured to include a resin tank cover and a core plate. A circumferential groove portion and a claw portion are formed in the core plate. The circumferential groove portion is formed around the core plate in a substantially U-shape and recessed toward the core portion. The plurality of claws are formed to be continuous with the outer wall of the circumferential groove and extend straight toward the opposite side from the core. The claws have a rectangular shape and are arranged in rows in the longitudinal direction.

The tank cover has an opening that is aligned opposite the core plate. A projecting portion that fits into the circumferential groove of the core plate is formed on the periphery of the opening. When assembling the tank cover and the core part, first assemble the packing to the bottom of the circumferential groove part, and then assemble the overhang part from above the packing. Further, the tank cover and the core plate are fixed in a liquid-tight manner by bending the claws inward along the protruding parts and pressing the protruding parts to the bottom of the circumferential groove via the packing.

Incidentally, there are various apparatuses and methods for bending the claw portions in such assembly. For example, when processing a plurality of claws (for example, three at a time) by caulking them once from above, a punch unit consisting of a curling punch for caulking and an inner receiving member is attached to the row of nails. They are moved in the direction of installation and processed sequentially. The inner receiving member suppresses inward rotation of the circumferential groove portion.

Japanese Patent Application Publication No. 8-141668

However, in the bending apparatus and method as described above, since the claw portion is caulked from above in one step, the bending load is large and the inward rotational force acting on the circumferential groove portion is also large. For this reason, an inner receiving member that presses the bottom of the circumferential groove of the core plate and the inner wall so as not to rotate is essential. However, such a device has a problem in that the device mechanism is complicated, and the time required for machining increases as the number of claws increases, resulting in inefficiency.

The present invention was created in view of these points, and its purpose is to prevent the inner wall from rotating in the circumferential groove of the core plate when attaching the core plate of a heat exchanger to a tank. An object of the present invention is to provide a heat exchanger caulking device and a heat exchanger caulking method that can improve production efficiency by eliminating an inner receiving member to be pressed.

The caulking device for a heat exchanger of the present invention has a tank cover (8) which is shaped like a container and has an opening (18) and has an overhang (19) extending outward and laterally from the periphery of the opening. , a heat exchanger that integrates a core plate (9) provided at the end of a core part (2) that performs heat exchange to form a tank (3) by bending the claw part of the core plate inward along the protruding part. This is a crimping device for exchangers.
The core plate includes a base (11) arranged to face the opening, an inner wall (15) formed along the periphery of the base and continuous with the base, and a recessed part continuous with the inner wall on the side opposite to the tank. It has a bottom part (16) and an outer wall part (17) continuous to the bottom part, and a circumferential groove part (12) for accommodating the overhang part in the bottom part, and a peripheral groove part (12) continuous to the end part of the outer wall part on the opposite side from the bottom part. A plurality of claw portions (13) arranged in a row are formed.

The caulking device for a heat exchanger is composed of a plurality of forming rollers (41, 42, 43, 44, 61, 62, 63, 64) that are rotatably supported in an undriven state, and includes a conveyance mechanism section (31). ) is provided with a group of forming rollers (33, 34) that applies pressure from the side to the claw portions to bend them inward stepwise during the process of conveying the heat exchanger.
The caulking device for a heat exchanger includes a tank holding member (37) that comes into contact with a portion of the tank opposite to the opening and restricts movement toward the side opposite to the opening of the tank during bending of the claw portion. .
The forming roller includes a bottom support part (51) that supports the bottom part during bending of the claw part, a claw bending part (53) that bends the claw part by applying pressure from the side, and a bottom support part and a claw bending part. A side abutting portion (52) is formed between the two and abutting the outer wall portion.
The rotation axis (45, 55) of the forming roller is arranged so that the part of the forming roller far from the transport line (L) where the tank cover and core plate are transported is located lower than the part near the transport line. It is tilted with respect to the central axis (M).

The caulking method for a heat exchanger according to the present invention includes a tank cover (8) having a container shape having an opening (18) and having an overhang (19) extending outward and laterally from the periphery of the opening. , a heat exchanger that integrates a core plate (9) provided at the end of a core part (2) that performs heat exchange to form a tank (3) by bending the claw part of the core plate inward along the protruding part. This is a crimping method for exchangers.
The core plate includes a base (11) arranged to face the opening, an inner wall (15) formed along the periphery of the base and continuous with the base, and a recessed part continuous with the inner wall on the side opposite to the tank. It has a bottom part (16) and an outer wall part (17) continuous to the bottom part, and a circumferential groove part (12) for accommodating the overhang part in the bottom part, and a peripheral groove part (12) continuous to the end part of the outer wall part on the opposite side from the bottom part. A plurality of claw portions (13) arranged in a row are formed.

In the heat exchanger caulking method, in the process of conveying the heat exchanger by the conveyance mechanism section (31), a plurality of forming rollers (41, 42, 43, 44) that are rotatably supported in an undriven state are used. A first forming roller group (33) constituted by applies pressure from the side to gradually bend the claws formed in a plurality of rows in the longitudinal direction on one side of the core plate inward. At the same time, a second forming roller group (34) composed of a plurality of rotatable forming rollers (61, 62, 63, 64) is used to form a roller that faces the nail portion on one side in the longitudinal direction of the other side of the core plate. A plurality of claws arranged in a row are bent inward in stages by applying pressure from the side.
The rotating shaft (45) of the first forming roller group and the second forming roller group (55) are such that a portion of the forming roller farther from the conveyance line (L) where the tank cover and core plate are conveyed is larger than a portion closer to the conveyance line. It is tilted with respect to the central axis (M) of the tank so that it is also located downward.
When bending the claw portion, the tank holding member (37) comes into contact with a portion of the tank opposite to the opening to restrict movement of the tank toward the side opposite to the opening.

According to the configuration of the present invention, by performing the multi-stage bending process, the load when bending the claw part is reduced. Since the core plate is bent from the side with respect to the claw portion, inward rotational deformation of the core plate is suppressed. Further, the abutment portion of the forming roller suppresses outward bulge of the outer wall portion of the circumferential groove portion.
Due to these interactions, for example, compared to the conventional method in which the inner wall of the core plate is held down by an inner receiving member to prevent it from rotating, and the claw is caulked in one step from above the claw, this configuration has a step-by-step process. In general bending, the rotation of the circumferential groove is suppressed, so there is no need to press the inner wall of the circumferential groove of the core plate. Therefore, the inner receiving member can be eliminated, and production efficiency can be improved by employing multistage processing using forming rollers.

FIG. 1 is an overall view showing a radiator according to a first embodiment. It is a perspective view which expands and shows the fixed part of the tank and core part in a radiator, (a) shows the state before assembly, (b) shows the state after assembly. FIG. 1 is an overall perspective view showing a caulking device for a heat exchanger according to a first embodiment. 4 is an overall perspective view showing the heat exchanger caulking device according to the first embodiment, and is a view seen from a different angle from FIG. 3. FIG. FIG. 3 is a front view of the heat exchanger caulking device viewed from the front side in the conveyance direction. FIG. 3 is a cross-sectional view illustrating how the claw portions are sequentially bent by forming rollers, in which (a) shows the processing by the first forming roller, (b) shows the processing by the second forming roller, and (c) shows the processing by the second forming roller. (d) shows processing by the third forming roller, and (d) shows processing by the fourth forming roller. FIG. 3 is a schematic cross-sectional view showing a forming roller and a tank during bending. FIG. 7 is a schematic cross-sectional view showing a caulking unit and a tank during bending by a comparative heat exchanger caulking device.

Embodiments of the present invention will be described below based on the drawings.
<First embodiment>
[composition]
A heat exchanger caulking device 30 and a heat exchanger caulking method according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 7. The caulking device 30 for a heat exchanger (hereinafter also simply referred to as the “caulking device 30”) and the caulking method for a heat exchanger of the present embodiment are performed in the manufacturing process of the radiator 1 as a heat exchanger. This method is applied to the process of manufacturing the inlet tank 3 and the outlet tank 4 by coupling the tubes 6, fins 7, and core plates 9) to the tank covers 8 and 80 via the packing 21.

[Configuration of radiator 1 (heat exchanger)]
First, the configuration of the radiator 1 will be explained. As shown in FIG. 1, the radiator 1 mainly includes a core portion 2, an inlet tank 3, an outlet tank 4, and a pair of side plates 5. The core part 2 is provided between the inlet tank 3 and the outlet tank 4, and is formed by alternately stacking a plurality of tubes 6 and corrugated fins 7. The core part 2 is mainly formed of aluminum material. In addition, in FIG. 1, the left-right direction corresponds to the longitudinal direction of the radiator 1. The width direction is defined as the depth direction of the paper plane in FIG. 1, which is orthogonal to the longitudinal direction.

The tube 6 passes the cooling water from the inlet tank 3 and discharges it to the outlet tank 4. The corrugated fins 7 exchange heat with the air passing through the core portion 2 . The side plates 5 are provided on both sides of the core part 2 and connect the ends of the inlet tank 3 and the outlet tank 4. The inlet tank 3 is provided above the core part 2 and supplies cooling water to the core part 2. The outlet tank 4 is provided at the lower part of the core part 2 and collects the cooling water that has passed through the core part 2.

Each tank 3, 4 includes a tank cover 8, 80 made of resin and a core plate 9 made of metal. As shown in FIG. 2, the core plate 9 is joined to the ends of the plurality of tubes 6 and has a substantially flat plate shape. The core plate 9 has a base portion 11, a circumferential groove portion 12, and a claw portion 13. A plurality of press-fit holes 14 into which the tubes 6 are press-fit are formed in the base 11 .

The circumferential groove portion 12 is formed around the entire periphery of the core plate 9 (both ends in the longitudinal direction and both ends of the short side) in a substantially U-shape and is recessed toward the core portion 2 side. Accommodates the exit portion 19. The circumferential groove portion 12 has an inner wall portion 15, a bottom portion 16, and an outer wall portion 17. The inner wall portion 15 is formed along the periphery of the base portion 11 and is continuous with the base portion 11 . The bottom portion 16 is continuous with the inner wall portion 15. The outer wall portion 17 is continuous with the bottom portion 16.

As shown in FIG. 2(a), the plurality of claw portions 13 are continuous with the outer wall of the circumferential groove portion 12, and are formed to extend straight toward the opposite side from the core portion 2 before assembly. The claw portions 13 have a rectangular shape and are arranged in rows around the entire circumference in the longitudinal direction and the width direction. The tank cover 8 is a container-shaped member having an opening 18 that faces and aligns with the core plate 9 . A projecting portion 19 projecting outward and laterally is formed at the periphery of the opening 18 . The projecting portion 19 fits into the circumferential groove portion 12 of the core plate 9.

The configuration of the inlet tank 3 will be explained. As shown in FIGS. 2(a) and 2(b), when assembling the tank cover 8 and the core portion 2, the packing 21 is attached to the bottom 16 of the circumferential groove portion 12, and the overhanging portion 19 is attached from above the packing 21. Furthermore, as shown in FIG. 2(b), the claw portion 13 is bent inward along the protruding portion 19, and the protruding portion 19 is crimped to the bottom portion 16 of the circumferential groove portion 12 via the packing 21. 8 is fixed to the core plate 9. In FIG. 2, the inlet tank 3 is shown as an example, but the outlet tank 4 has the same configuration as the inlet tank 3, so details thereof will be omitted.

[Configuration of heat exchanger caulking device 30]
Next, the configuration of the caulking device 30 for bending the claw portions 13 formed in the longitudinal direction of the core plate 9 inward in the manufacturing process of the radiator 1 described above will be described. As shown in FIG. 3, the heat exchanger caulking device 30 applies pressure to the claw portions 13 from the side while conveying the radiator 1 by the conveyance mechanism portion 31 to bend the claw portions 13 inward in stages, It is assembled integrally with the transport mechanism section 31. Note that the claws 13 in the width direction are also bent and sealed as the tanks 3 and 4, but since the number of claws 13 in the width direction is smaller than the number of claws 13 in the longitudinal direction, in this embodiment, the claws 13 in the longitudinal direction are Bending is performed efficiently by focusing on the claw portions 13 in the direction.

The conveyance mechanism section 31 conveys the radiator 1 in the conveyance direction with the longitudinal direction of the radiator 1 aligned with the conveyance direction while holding the radiator 1 in the caulked or uncaulked state with the claws 13 . In FIGS. 3 and 4, the conveyance direction is indicated by a solid arrow A. In the radiator 1 at this time, a packing 21 is provided at the bottom 16 of the circumferential groove part 12 of the tank cover 8, and a projecting part 19 is assembled from above the packing 21.

The transport mechanism section 31 includes an installation rail 32 on which the radiator 1 is set, a holding mechanism (not shown) that holds the radiator 1 from above on the front, rear, left and right sides, and transports the radiator 1 held by the holding mechanism in a horizontal transport direction. It is equipped with an actuator (not shown) and the like. The conveyance mechanism section 31 may have any other configuration as long as it can convey the radiator 1 in the conveyance direction so that the claws 13 in the longitudinal direction pass through forming roller groups 33 and 34 (details will be described later).

The caulking device 30 mainly includes a first forming roller group 33, a second forming roller group 34, a rotating shaft support member 35, a roller fixing member 36, and a tank holding member 37 (see FIG. 7). Note that when viewing the destination from the front in the transportation direction, the right side is defined as "one side" and the left side is defined as "the other side."

As shown in FIG. 4, an application mechanism section 56 (not shown in FIG. 3) that applies oil to the claw section 13 is provided at a position upstream of each forming roller group 33, 34 in the conveyance direction. The applicator mechanism 56 has an oil tank 57 and an applicator hand 58. The applicator hand 58 scoops up the oil stored in the oil tank 57, and the applicator hand 58 applies the oil to the claw part 13. ing. In addition, in FIG. 4, only the core plate 9 in the radiator 1 being transported is illustrated by a solid line.

Each forming roller group 33, 34 has four forming rollers 41, 42, 43, 44, 61, 62, 63, 64, respectively. The first forming roller group 33 is located on one side of the transport line L, and the second forming roller group 34 is located on the other side of the transport line L. The second forming roller group 34 is provided opposite to the first forming roller group 33 with the conveyance line L interposed therebetween.

The configuration of the four forming rollers 41, 42, 43, 44 of the first forming roller group 33 and the four forming rollers 61, 62, 63, 64 of the second forming roller group 34 is centered around the conveyance line L. Since they are symmetrical and similar, the forming rollers 41, 42, 43, and 44 forming the first forming roller group 33 will be explained as an example. The first forming roller group 33 includes a first forming roller 41, a second forming roller 42, a third forming roller 43, and a fourth forming roller 44 in order from downstream to upstream in the conveyance direction. Each of the forming rollers 41, 42, 43, and 44 has a disk shape (flat cylindrical shape) and has flange-like portions at the upper and lower ends.

As shown in FIG. 5, each of the forming rollers 41, 42, 43, 44, 61, 62, 63, 64 is tilted so that the outer side is lower around the rotating shafts 45, 55, and attached to the roller fixing member 36. Rotatably supported. As shown in FIGS. 5 and 7, the rotating shafts 45, 55 of each forming roller 41, 42, 43, 44, 61, 62, 63, 64 are 63 and 64 are inclined with respect to the central axis M of the tank 3 (tank cover 8) so that the parts far from the transport line L are located lower than the parts near the transport line L. Each of the forming rollers 41, 42, 43, 44, 61, 62, 63, 64 is not driven by an actuator or the like, and is capable of rotating by a predetermined angle when the product passes therethrough.

Referring again to FIG. The rotating shaft support member 35 is a cover member that covers the rotating shafts 45, 55 of the forming rollers 41, 42, 43, 44, 61, 62, 63, 64. The roller fixing member 36 reinforces the rotating shaft support member 35 and fixes the forming rollers 41, 42, 43, 44, 61, 62, 63, 64 in predetermined positions, and also attaches bolts 46, etc. to the conveyance mechanism section 31. Fixed by The rotating shaft support member 35 is fixed to the roller fixing member 36 with bolts 47 or the like.

As shown in FIG. 6, each forming roller 41, 42, 43, 44, 61, 62, 63, 64 has a bending portion 50. The bending section 50 includes a bottom support section 51, a side abutment section 52, and a claw bending section 53. Note that the bent portions 50 (bottom support portion 51, side contact portions 52, and claw bent portions 53) of each forming roller 41, 42, 43, 44, 61, 62, 63, 64 have different shapes. The same reference numerals are given to these parts because they have substantially the same configuration and perform the same function. The bottom support portion 51 is formed in an annular flange shape on the outer periphery of the lower end portions of the forming rollers 41 , 42 , 43 , 44 , 61 , 62 , 63 , and 64 . I support 16. The "lower end" corresponds to "one end in the direction of the rotation axis."

The claw bending portion 53 is formed in an annular flange shape on the outer periphery of the upper end of the forming rollers 41 , 42 , 43 , 44 , 61 , 62 , 63 , and 64 . Apply pressure from both sides and bend. The "upper end" corresponds to the "other end in the direction of the rotation axis." The side contact portion 52 is formed by the outer peripheral surface between the bottom support portion 51 and the claw bending portion 53, and comes into contact with the outer wall portion 17 of the circumferential groove portion 12 when the claw portion 13 is bent.

The tank holding member 37 is a plate-shaped member disposed above the first forming roller group 33 and the second forming roller group 34 along the conveyance line L. The tank holding member 37 works in conjunction with the conveyance mechanism section 31 and abuts the tank 3 of the radiator 1 conveyed between the forming roller groups 33 and 34 from above, thereby preventing the radiator 1 from moving upward inadvertently during caulking. Stabilize your posture so that you don't move.

As shown in each figure of FIGS. 6(a) to (d), the first forming rollers 41, 61, the second forming rollers 42, 62, the third forming rollers 43, 63, and the fourth forming rollers 44, 64 The claw bending portions 53 are inclined such that the outside is lower at the respective inclination angles α1, α2, α3, and α4. The inclination angle of the pawl bending portion 53 of each forming roller 41, 42, 43, 44, 61, 62, 63, 64 is, in order from the first forming roller 41, 61 to the fourth forming roller 44, 64, an inclination angle α1, The inclination angle α2, the inclination angle α3, and the inclination angle α4 become smaller in this order (α1>α2>α3>α4). Further, the heights T1, T2, T3, T4 from the bottom support portion 51 to the claw bent portion 53 of the forming rollers 41, 42, 43, 44, 61, 62, 63, 64 are from the first forming rollers 41, 61 to The fourth forming rollers 44 and 64 are lower in order (T1>T2>T3>T4)

That is, in the process in which the radiator 1 passes from the first forming rollers 41, 61 to the fourth forming rollers 44, 64, each forming roller 41, 42, 43, 44, 61, 62, 63 , 64 contact each other at different bending angles and heights, so that the claw portions 13 are bent in stages. The bottom support portion 51 formed under each forming roller 41, 42, 43, 44, 61, 62, 63, 64 is substantially horizontal.

[Caulking method for heat exchanger]
Next, a crimping method using the crimping device 30 will be explained. Since the inlet tank 3 and the outlet tank 4 can be implemented in the same process, the inlet tank 3 will be explained. In this embodiment, the claw portions 13 extending from both longitudinally extending edges of the inlet tank 3 are bent.

First, the packing 21 is attached to the bottom 16 of the circumferential groove 12 of the core plate 9, and the overhanging part 19 is fitted into the circumferential groove 12 from above the packing 21. The radiator 1 with the claws 13 not yet caulked is held by the transport mechanism 31 and transported in the transport direction.

When the radiator 1 passes through each forming roller 41, 42, 43, 44, 61, 62, 63, 64, as shown in FIG. It is located between the bottom support part 51 and the claw bending part 53 of each forming roller 41, 42, 43, 44 (only the first forming roller 41 is shown in FIG. 7) constituting the forming roller group 33. The circumferential groove portion 12 on the other side (the left side in FIG. 7) is the bottom of each forming roller 61, 62, 63, 64 (only the first forming roller 61 is shown in FIG. 7) constituting the second forming roller group 34. It is located between the support part 51 and the claw bending part 53. In FIG. 7, only the tank 3 of the radiator 1 is shown in cross section, and only the first forming rollers 41 and 61 of the caulking device 30 are shown in solid lines.

As shown in FIG. 7, the claw portion 13 on one side is bent by passing through the first forming roller group 33. As shown in FIG. The claw portion 13 on the other side is bent by passing through the second forming roller group 34 . These processes are performed simultaneously while the radiator 1 passes between the first forming roller group 33 and the second forming roller group 34.

The side surface abutting portion 52 abuts the outer wall portion 17 of the circumferential groove portion 12, and the claw bending portion 53 abuts the claw portion 13 from the side and applies pressure, thereby bending the claw portion 13 inward. The side surface abutting portion 52 prevents the outer wall portion 17 of the circumferential groove portion 12 from deforming in the direction of expanding outward. As each claw portion 13 on one side moves in the conveyance direction, it passes through the first forming roller 41, the second forming roller 42, the third forming roller 43, and the fourth forming roller 44 in sequence. At the same time, each claw portion 13 on the other side sequentially passes through the first forming roller 61, the second forming roller 62, the third forming roller 63, and the fourth forming roller 64 as it moves in the conveyance direction.

Each forming roller 41 , 42 , 43 , 44 , 61 , 62 , 63 , 64 rotates a rotating shaft 45 , 55 when the tank 3 passes between the rollers and bends the claw portion 13 inward by the bending portion 50 . Rotation around the center is allowed. When passing through the fourth forming rollers 44, 64, the originally standing claw portion 13 undergoes a four-step bending process and finally becomes as shown in FIGS. 6(d) and 2(b). It is bent along the upper end of the overhang 19. The forming roller groups 33 and 34 arranged symmetrically with respect to the conveyance line L simultaneously process the opposing claws 13 in the longitudinal direction, thereby stabilizing the attitude of the tank 3 during bending.

Finally, the claw portion 13 in the width direction is also bent, and the overhang portion 19 is crimped to the bottom portion 16 of the circumferential groove portion 12 via the packing 21, thereby forming the tank cover 8 and the core plate 9. liquid-tightly fix the

[effect]
(1) The comparative form shown in FIG. 8 is an example of a conventional construction method, and shows a caulking device 70 that caulks and processes the claw portion 13 from above in one operation. The caulking device 70 includes a curling punch 71 and an inner receiving member 72. A rotation prevention protrusion 73 is formed on the inner edge of the inner receiving member 72 and protrudes upward so as to cover the lower end of the inner wall portion 15 of the circumferential groove portion 12 . In this caulking device 70, a force that crushes the core plate 9 downward as shown by arrow B acts, and a rotational force acts on the core plate 9 inward as shown by arrow C. Rotation is suppressed by receiving this rotational force with the inner receiving member 72.

On the other hand, according to the present configuration described in the first embodiment, the load when bending the claw portion 13 is reduced by performing multi-stage bending. Since the claw portion 13 is bent from the side rather than from above, rotational deformation of the core plate 9 inward is suppressed. Further, the side surface abutting portions 52 of the forming rollers 41, 42, 43, 44, 61, 62, 63, and 64 suppress outward bulge of the outer wall portion 17 of the circumferential groove portion 12.

As shown in FIG. 8 above, in comparison with the form in which the inner wall portion 15 of the core plate 9 is held down by the inner receiving member 72 so as not to rotate, the claw portion 13 is caulked once from above the claw portion 13, in this configuration, In the stepwise bending process, rotation of the circumferential groove portion 12 is suppressed. Therefore, there is no need to press the inner wall portion 15 of the circumferential groove portion 12 of the core plate 9, and the inner receiving member 72 can be eliminated. The device configuration is simplified, and by eliminating the inner support member 72 that presses the inner wall 15 when attaching the core plate 9 of the heat exchanger to the tank, each forming roller 41, 42, 43, 44, 61, Multi-stage processing using 62, 63, and 64 becomes possible, and production efficiency can be improved.

(2) In addition, since the pawl portion 13 is not processed simultaneously from the top but is processed sequentially in multiple stages using forming rollers 41, 42, 43, 44, 61, 62, 63, and 64, the machining load is small and the pawl portion 13 is not processed simultaneously from the top. Unnecessary deformation of portions other than the portion 13 can be reduced. Thereby, variations in the compression ratio of the packing 21 can be suppressed and sealing performance can be improved.

(3) Furthermore, in the comparative embodiment shown in FIG. 8, the radiator 1 is transported to a predetermined position, a plurality of (for example, three) claws 13 are caulked by the curling punch 71, and the radiator 1 is transported to the next predetermined position. The action is to caulk the claw portion 13. In this respect, in the first embodiment, transportation and caulking are performed as a set, and bending can be performed at the same time as transportation, which improves production efficiency.

(4) Furthermore, in the above comparative embodiment, if the size of the radiator 1 is large and the number of claw portions 13 increases, the bending process will take a corresponding amount of time. However, in the first embodiment, by adjusting the conveyance speed regardless of the size of the product, the cycle time can be made constant even for products of different sizes. In this way, changes in the amount can be handled by changing the conveyance speed.

(5) In the first embodiment, the first forming roller group 33 and the second forming roller group 34 are arranged to face each other, and the opposing claws 13 are caulked and bent from both sides of the tank 3 at the same time. ing. In other words, since the tank 3 is pressed from both sides in the width direction, the attitude of the tank 3 during bending can be stabilized.

(6) In the first embodiment, the rotating shafts 45, 55 of the forming rollers 41, 42, 43, 44, 61, 62, 63, 64 have outer portions farther from the conveying line L of the forming rollers positioned downward. It is tilted with respect to the central axis M of the tank 3 so that it does. If the rotating shafts 45, 55 and the central axis M are parallel and each forming roller is installed horizontally, when the forming roller contacts the tank, the load acts in the vertical direction and the circumferential direction, and the conveyance Scratches are likely to occur on the surface. In this regard, according to the present embodiment, when the forming roller contacts the tank, the load is applied vertically to the line, so that scratches on the product conveyance surface can be minimized.

(7) In the first embodiment, when the claw portion 13 is bent, the tank 3 is held down from above by the tank holding member 37. Therefore, the tank 3 can be prevented from floating upward during transportation.

<Other embodiments>
In the above embodiment, each forming roller group 33, 34 has four forming rollers 41, 42, 43, 44, 61, 62, 63, 64, and performs four stages of bending. However, the number of forming rollers is not four, but can be changed as appropriate, such as three or five or more.

In the above embodiment, the radiator 1 has been described as an example of a heat exchanger, but the present invention may be applied to other heat exchangers whose claw portions are bent.

The present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention.

1...Radiator (heat exchanger)
2...Core part 3...Inlet tank 8...Tank cover 9...Core plate 11...Base 12...Peripheral groove part 13...Claw part 15...Inner wall part 16... - Bottom part 17 ... Outer wall part 18 ... Opening part 19 ... Overhang part 30 ... Heat exchanger caulking device 31 ... Conveyance mechanism part 33 ... First forming roller group 34 ... Second forming roller group 41, 42, 43, 44, 61, 62, 63, 64...Forming roller 50...Bending section 51...Bottom support section 52...Side contact section 53...・Claw bending part

Claims (4)

A tank cover (8) is shaped like a container with an opening (18), and has an overhang (19) formed at the periphery of the opening to overhang outward and laterally, and a core part (2) that performs heat exchange. ) and a core plate (9) provided at the end of the heat exchanger by bending a claw portion of the core plate inward along the projecting portion to form a tank (3). ,
The core plate includes:
a base (11) disposed opposite to the opening;
An inner wall (15) formed along the periphery of the base and continuous with the base, a bottom (16) continuous with the inner wall and recessed on the opposite side of the tank, and an outer wall (17) continuous with the bottom. ), and a circumferential groove portion (12) that accommodates the projecting portion in the bottom portion;
A plurality of the claw portions (13) are formed in a continuous row at an end of the outer wall portion opposite to the bottom portion,
It is composed of a plurality of forming rollers (41, 42, 43, 44, 61, 62, 63, 64) that are rotatably supported in an undriven state, and the heat exchanger is transported by the transport mechanism section (31). a group of forming rollers (33, 34) that apply pressure from the side to the claw part to bend it inward in stages in the process of
a tank holding member (37) that comes into contact with a portion of the tank on the opposite side of the opening to restrict movement of the tank toward the side opposite to the opening when the claw portion is bent;
Equipped with
The forming roller has the following properties when bending the claw portion:
a bottom support part (51) that supports the bottom part;
a claw bending part (53) that bends the claw part by applying pressure from the side;
A side abutting part (52) is formed between the bottom support part and the claw bending part and abutting the outer wall part ,
Regarding the rotation axis (45, 55) of the forming roller, a portion of the forming roller farther from the conveyance line (L) along which the tank cover and the core plate are conveyed is located lower than a portion closer to the conveyance line. The heat exchanger caulking device is inclined with respect to the central axis (M) of the tank . The forming roller has a cylindrical shape,
The bottom support portion is formed in an annular flange shape on the outer periphery of one end of the forming roller in the rotation axis direction,
The pawl bending portion is formed in an annular flange shape on the outer periphery of the other end in the direction of the rotation axis of the forming roller,
The caulking device for a heat exchanger according to claim 1, wherein the side abutting portion is formed by an outer circumferential surface between the bottom support portion and the claw bending portion of the forming roller. The forming roller group is
a first forming roller group (33) that bends in stages a plurality of claws arranged in a longitudinal direction on one side of the core plate;
The nails on the one side are provided opposite to the first forming roller group across the conveyance line (L) on which the tank cover and the core plate are conveyed, and are arranged in the longitudinal direction of the other side of the core plate. a second forming roller group (34) that bends in stages the plurality of claw parts that are arranged in rows opposite to each other;
The caulking device for a heat exchanger according to claim 1 or 2, comprising: A tank cover (8) is shaped like a container with an opening (18), and has an overhang (19) formed at the periphery of the opening to overhang outward and laterally, and a core part (2) that performs heat exchange. ) and a core plate (9) provided at the end of the core plate (9) are integrated into a tank (3) by bending a claw portion of the core plate inward along the projecting portion, the method comprising: ,
The core plate includes:
a base (11) disposed opposite to the opening;
An inner wall (15) formed along the periphery of the base and continuous with the base, a bottom (16) continuous with the inner wall and recessed on the opposite side of the tank, and an outer wall (17) continuous with the bottom. ), and a circumferential groove portion (12) that accommodates the projecting portion in the bottom portion;
A plurality of the claw portions (13) are formed in a continuous row at an end of the outer wall portion opposite to the bottom portion,
In the process of transporting the heat exchanger by the transport mechanism section (31), the first molding is made up of a plurality of molding rollers (41, 42, 43, 44) that are rotatably supported in an undriven state. A group of rollers (33) applies pressure from the side to the claws, which are formed in a plurality of rows in the longitudinal direction of one side of the core plate, and bends them stepwise inward. A second forming roller group (34) composed of possible forming rollers (61, 62, 63, 64) is arranged in a row in the longitudinal direction of the other side of the core plate, facing the claw portion on the one side. applying pressure from the side and bending the plurality of claw parts inward in stages ,
Regarding the rotation axis (45, 55) of the forming roller, a portion of the forming roller farther from the conveyance line (L) along which the tank cover and the core plate are conveyed is located lower than a portion closer to the conveyance line. , it is inclined with respect to the central axis (M) of the tank,
When bending the claw portion, a tank holding member (37) contacts a portion of the tank opposite to the opening to restrict movement of the tank toward the opposite side of the opening. A dexterous caulking method.

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