KR20010106089A - Method of expanding heat exchanger tube and tube expander - Google Patents

Abstract

In the opening end of the tube for heat exchanger, when forming a connector with a flare for inserting one end of the connector tube which connects the tubes of the heat exchanger to each other, the tube for the heat exchanger in which the flare is less likely to be cracked, etc. Provide tube enlargement device.

In the tube expanding apparatus of the heat exchanger tube which enlarges the heat exchanger tube which passed through the said through hole so that a front end part protrudes from the one end surface side of the laminated body formed by laminating | stacking the several sheets of fins provided through the through hole, Temporary tube enlargement in which the temporary tube enlargement which becomes larger diameter than the opening diameter of the said opening end can be performed in the vicinity of the opening end of the heat exchanger tube which protrudes from one end surface side of a laminated body, and at the predetermined position from the said opening end. A primary tube enlarger (40) for integrating the fin and the tube for the heat exchanger by performing a primary tube enlargement over the device (10), the entire length of the tube for the heat exchanger, and the opening end of the tube for the heat exchanger. A flare is inserted into the end of the connecting tube connecting the plurality of heat exchanger tubes inserted into the stack to each other. It characterized in that it includes a second and third primary pipe expanding device 80.

Description

Tube expansion method of tube for heat exchanger and tube expansion device {METHOD OF EXPANDING HEAT EXCHANGER TUBE AND TUBE EXPANDER}

As shown in FIG. 12, a heat exchanger used for a cooler used in a home, a car, or a factory is formed by stacking a plurality of fins 202, 202 ·· which are provided with through holes 200, 200 ·. In the laminate 204, tube enlargement is carried out over the entire length of the heat exchanger tubes 206, 206 ... passed through the perspective holes 200, 200, and the fin 202 and the heat exchanger tube 206 are integrated. It is formed by.

Connection pipes 208 and 208 connecting the heat exchanger tubes 206 and 206 to the opening ends protruding from the stack 204 of the heat exchanger tubes 206 integrated with the fins 202 by the tube expansion. An insertion hole 210 is formed with a flare for inserting one end thereof. The insertion hole 210 with this flare is conventionally formed with a flare attached to the open end of the heat exchanger tube 206 after the tube heat exchanger tubes 206 and 206 are integrated with the fins 202 and 202. It is formed by inserting a flare punch for inserting hole formation.

In the conventional method for forming the insertion hole 210 with flare, cracks or the like may occur in the insertion hole 210 with the flare formed at the opening end of the tube 206 for heat exchanger. Heat exchangers in which cracks or the like have occurred are treated as defective products.

In particular, in recent years, in response to requests such as weight reduction of heat exchangers, a heat exchanger tube having a thinner wall and a spiral groove formed on an inner wall thereof is adopted, and cracks are likely to occur in the insertion hole with flare.

Further, when the tube 206 for heat exchanger is enlarged over the entire length, shrinkage due to tube enlargement occurs in the tube 206 for heat exchanger. The degree of shrinkage of the heat exchanger tube 206 is different for each heat exchanger tube 206. For this reason, in the heat exchanger tubes 206 and 206 ... in which tube expansion is completed, the protruding length (the length from the end surface of the laminated body 204 to the end of the opening) projecting from the laminate 204 is the tube 206 for heat exchange. It's different. Therefore, even if a flare is attached to the opening end of the heat exchanger tube 206, the protruding length of the heat exchanger tube 206 (from the end face of the laminated body 204 to the opening end of the flare is inserted) Length) is also uneven between heat exchanger tubes 206.

In this way, if the length of the protrusion of the heat exchanger tube 206 is uneven, the opening end position of the opening end with the flare is not constant. Therefore, the connection pipes 208, 208 ... It is difficult to autofit on.

The present invention relates to a tube expanding method for a heat exchanger tube and a tube expanding device, and more particularly, a tube for a heat exchanger, which is passed through the through hole in a laminate formed by stacking a plurality of fins provided with through holes. The present invention relates to a tube expanding method and a tube expanding apparatus for a tube for heat exchanger.

1 is a front view showing an example of a tube expanding apparatus according to the present invention;

FIG. 2 is a partial side view of the position adjusting side device 10b constituting the temporary tube expanding device 10 of the tube expanding device shown in FIG. 1;

3 is a partial cross-sectional side view of a temporary tube enlargement unit provided in the positioning device 10b shown in FIG. 2;

4A is an explanatory diagram illustrating a state of temporary tube enlargement war by the temporary tube expander shown in FIG. 2;

4B is an explanatory diagram for explaining a state after the temporary tube enlargement by the temporary tube expander shown in FIG. 2;

FIG. 5A is a partial side view of the reciprocating member 44 side of the reference side apparatus 40b constituting the primary tube expanding apparatus 40 of the tube expanding apparatus shown in FIG. 1;

FIG. 5B is a partial side view of the chuck device 48 side of the reference side device 40b constituting the primary tube expanding device 40 of the tube expanding device shown in FIG. 1;

6 is a partial cross-sectional side view of the chuck device 48 installed in the reference side device 40b shown in FIG. 5B;

FIG. 7A is an explanatory diagram for explaining a state immediately before performing the first tube enlargement using the chuck device 48 of the reference side device 40b shown in FIG. 6;

FIG. 7B is an explanatory diagram for explaining a state of the primary tube enlargement performed by using the chuck device 48 of the reference side device 40b shown in FIG. 6;

FIG. 8 is a partial side view of the position adjusting side device 40a constituting the primary tube expanding device 40 of the tube expanding device shown in FIG. 1;

FIG. 9 is a partial side view of the position adjusting side device 80a constituting the second and third tube dilators 80 of the tube dilator shown in FIG. 1;

FIG. 10 is a partial cross-sectional side view of the second and third tube enlargement units installed in the positioning device 80a shown in FIG. 9;

FIG. 11 is an explanatory diagram illustrating second and third tube enlargement performed by using the second and third tube enlargement units shown in FIG. 10; and

12 shows explanatory views for explaining the insertion hole with a flare formed in the opening end part of the tube for heat exchangers, respectively.

Therefore, the first subject of the present invention is that the opening end of the heat exchanger tube is formed at the opening end of the tube for heat exchanger so as to form an insertion hole with a flare for inserting one end of the connecting tube which interconnects the tubes for the heat exchanger. It is an object of the present invention to provide a tube expanding method of a tube for heat exchanger, in which cracks, etc., are hardly generated at the end portion of the enlarged opening even when the tube is enlarged.

Moreover, the 2nd subject of this invention is lamination | stacking from the opening end of the insertion hole with a flare of each heat exchanger tube which protrudes from a laminated body, when the insertion opening with flare was finally formed in the opening end part of the tube for heat exchangers. Provides a tube enlargement method and tube enlargement apparatus of the tube for heat exchanger, which can make the protrusion length to the sieve as even as possible and hardly cause cracks or the like in the insertion hole to which the formed flare is attached, even if the insertion hole with the flare is formed. It's there.

In order to solve the above problems, the inventors of the present invention have found that if the open end of the heat exchanger tube is rapidly enlarged, cracks are likely to occur at the open end. Even when the opening end is largely enlarged, such as the formation of an insertion hole with a groove, it is difficult to cause cracks at the opening end, and when the tube for the heat exchanger is enlarged over the entire length, the opening end of the heat exchanger tube is gripped. By expanding the tube, it was found that the amount of shrinkage and the difference of the tube for heat exchanger due to the tube enlargement can be reduced as much as possible, and the present invention has been reached.

That is, in the present invention, when the tube for the heat exchanger passed through the viewing hole is enlarged so as to protrude from the one end surface side of the laminate formed by stacking a plurality of fins provided with through holes, the lamination is carried out. Temporary tube enlargement is performed in the front end of the heat exchanger tube which protrudes from the sieve, and the predetermined position from the opening end of the said front end after temporary tube enlargement forms the temporary tube enlargement part of larger diameter than the opening diameter of the said opening end. After that, the primary tube enlargement is performed over the entire length of the heat exchanger tube so as to integrate the fin and the tube for the heat exchanger.

In the tube expanding method of the heat exchanger tube according to the present invention, one end of a connecting tube connecting the plurality of heat exchanger tubes inserted in the stack to the opening end of the heat exchanger tube subjected to the primary tube expansion. By carrying out the second and third tube enlargement forming the insertion hole with the flare for inserting the portion, the insertion hole with the flare without cracks can be easily formed.

In order to substantially prevent shrinkage of the heat exchanger tube due to tube enlargement during the first tube enlargement, the outer peripheral side of the opening end portion in which the temporary tube enlargement of the heat exchanger tube that protrudes from both end faces of the laminate is provided. By holding and enlarging a tube, the opening end of the insertion hole with a flare formed in each opening end part of the heat exchanger tube can be made to coincide. At this time, the gripping of the heat exchanger tube can be easily and surely ensured by gripping the outer peripheral side of the opening end portion in which the tube for heat exchanger has been temporarily expanded with a cylindrical gripping hole.

Further, primary tube enlargement is performed by alternately inserting tube enlargement billets from both opening ends of the heat exchanger tubes protruding from both ends of the laminate to extend the entire tube length even for long heat exchanger tubes. You can do it.

In addition, the present invention is a heat exchanger tube which tube-expands the heat exchanger tube passed through the sight hole so that the front end part protrudes from one end face side of the laminate formed by stacking a plurality of fins provided with through holes. In the tube expanding apparatus, temporary tube expansion is performed at the front end of the tube for heat exchanger protruding from one end surface side of the laminate, and a predetermined position from the opening end of the front end after the temporary tube expansion is set at the opening end. A primary tube enlargement apparatus for forming a temporary tube enlargement having a larger diameter than the opening diameter, and a primary tube enlargement apparatus for integrating the fin and the tube for heat exchanger by performing primary tube enlargement over the entire length of the tube for heat exchanger. In the tube expanding device of the heat exchanger tube characterized in that it comprises a.

In the tube enlargement apparatus of the heat exchanger tube according to the present invention, one end of a connecting tube connecting the plurality of heat exchanger tubes inserted in the stack to the opening end of the heat exchanger tube subjected to the primary tube enlargement. By means of the second and third tube enlargement apparatuses forming the insertion hole with the flare for inserting the portion, the insertion hole with the flare free of cracks can be easily formed by the tube enlargement apparatus of one heat exchanger tube. .

The second and third tube expanding apparatuses include a flare punch having a front end inserted into an opening end of a tube for a heat exchanger, and forming an insertion hole with a flare for inserting one end of a connecting tube into the opening end. Can be used suitably.

A temporary tube expanding apparatus for use in the tube expanding apparatus according to the present invention, wherein when the front end is inserted into the heat exchanger tube, the outer diameter of the portion located at a predetermined position from the opening end of the heat exchanger tube is larger than the rear end side. At the same time, a temporary tube enlargement punch in which the outer diameter of the front end is freely enlarged and reduced in diameter, a temporary tube enlargement pin provided with a pin that enlarges the outer diameter of the front end when inserted into the temporary tube enlargement punch, and the temporary By using a temporary tube expanding apparatus having a driving device for driving the pins of the tube expanding fins into the temporary tube expanding punches, the temporary tube expanding can be easily performed at a predetermined position from the opening end of the tube for the heat exchanger. have.

Further, as a primary tube expanding apparatus, a gripping means for holding the outer circumferential side of each projecting portion of the heat exchanger tube projecting from both end faces of the laminate so as to substantially prevent contraction of the heat exchanger tube due to tube enlargement. Since the opening end of the heat exchanger tube in which the primary tube enlargement is completed can be made uniform by using the primary tube enlargement apparatus provided with an opening, the opening of the insertion hole with a flare formed in the opening end of the tube for heat exchanger. You can even out the ends.

Here, the clamping means is a clamp chuck to hold a cylindrical clamp chuck in which a temporary tube-expanded opening end of the heat exchanger tube is inserted to reduce the diameter, and a gripping opening of the heat exchanger tube inserted into the clamp chuck. The gripping means which slides along the outer peripheral surface and which is provided so that the clamp chuck can be fastened in the diameter reduction direction can be suitably used.

The gripping means is provided with a protrusion formed on the inner surface side of the front end of the clamp chuck so that when the clamp chuck is fastened by the clamp sleeve, a temporary tube-expanded opening end of the heat exchanger tube inserted into the clamp chuck is caught. In addition, it is possible to easily and reliably grip the temporary tube-extended opening end of the tube for heat exchanger.

Usually, a long tube is cut | disconnected to a predetermined length and used for the tube for heat exchangers. For this reason, the opening end of the heat exchanger tube is hardened to some extent by heat, plastic deformation, etc. which generate | occur | produce at the time of cutting | disconnection, and it is considered that a crack etc. generate | occur | produce in an opening end by rapid tube enlargement.

In this regard, in the present invention, the first tube enlargement is performed by performing a temporary tube enlargement near the opening end of the heat exchanger tube and at a predetermined position from the opening end to a larger diameter than the opening diameter of the opening end. It is possible to enlarge the diameter of the opening step by step without applying excessive force, in other words, excessive force to the opening end of the protrusion of the tube. As a result, even when the opening end of the heat exchanger tube is greatly enlarged, such as in the case of forming an insertion hole with a flare at the opening end of the tube for heat exchanger subjected to the primary tube enlargement, the opening end of the tube for heat exchanger in advance By carrying out temporary tube enlargement, the crack which is easy to generate | occur | produce in the tube enlarged opening edge can be prevented, and the 1st subject of this invention can be solved.

In the present invention, in order to substantially prevent contraction of the heat exchanger tube due to the tube expansion during the first tube expansion, the outer peripheral side of each of the protrusions of the heat exchanger tube that protrudes from both end faces of the laminate is gripped. In the case of tube enlargement, the temporary tube enlarged portion of the tube for heat exchanger is easily and reliably and securely gripped at a predetermined position by the temporary tube enlarged temporary tube portion located at a predetermined position from the opening end of the tube for heat exchanger. The tube can be expanded over the entire length. For this reason, in each of the heat exchanger tubes after the primary tube enlargement, each opening end position can be matched to a predetermined position. Thus, if the insertion hole with a flare is formed in the opening end of the heat exchanger tube matched with the predetermined position, the opening end of the insertion hole with the flare formed can also be matched with a predetermined position.

Further, before the first tube enlargement, a temporary tube enlargement is made near the opening end of the heat exchanger tube and at a predetermined position from the opening end to a larger diameter than the opening diameter of the opening end. Even if the film is formed, it is possible to prevent the occurrence of cracks and the like that are likely to occur at the opening end of the insertion hole with the flare, and as a result, the second problem of the present invention can be solved.

1 is a horizontal tube expander as an example of a tube expander for a tube for heat exchanger according to the present invention. The tube dilator shown in FIG. 1 tube enlarges the tube for heat exchangers in which the opening end protrudes from each end surface of the laminated body formed by laminating | stacking the several sheets of fins provided with the through-hole.

The tube dilator shown in FIG. 1 performs a temporary tube enlargement having a larger diameter than the opening diameter of the opening end in the vicinity of the opening end of the heat exchanger tube protruding from one end face side of the laminate and at a predetermined position from the opening end. A temporary tube expander (10), a primary tube expander (40) for integrating the fin and the tube for heat exchangers by performing a first tube enlargement over the entire length of the tube for the heat exchanger, and a tube for the heat exchanger At the opening end of the protruding portion of the projections to form an insertion hole with a flare attached to the opening end of the tube for heat exchanger to enable insertion of one end of a connecting tube connecting the plurality of tubes for heat exchanger inserted into the stack to each other. It is composed of a vehicle expansion device (80).

In such a tube expanding apparatus, reference side apparatuses 10a, 40a, 80a serving as a reference are provided on the left side, and position adjusting side apparatuses 10b, 40b, 80b capable of position adjustment are provided on the right side. . For this reason, the servo motors 11, 41, 81 used at the time of position adjustment are provided in each of the position adjustment side apparatuses 10b, 40b, and 80b.

Moreover, the tube group A which consists of a tube for heat exchangers which an opening edge protrudes from each of the both end surface sides of a laminated body is made into the next after the required tube expansion is complete | finished by the endless belts V, V, V. The tube is transferred to a device for enlarging the tube.

First, among the tube expanding apparatuses shown in FIG. 1, the position adjusting side apparatus 10b of the temporary tube expanding apparatus 10 is demonstrated based on FIGS. 2-4B.

In the position adjustment side apparatus 10b shown in FIG. 2, the movable stand 14 is movable so that it may move along the rail 13 provided on the base 12. As shown in FIG. The movable table 14 is connected to a ball screw 18 to which a pulley 16 which transmits a driving force of the servomotor 11 (FIG. 1) is fixed to one end thereof, and is used to drive the servomotor 11. It can move to a left-right direction and can adjust a position to a predetermined position. The servomotor 11 is driven when the movable table 14 is moved to a predetermined position so as to conform to the length of the tube group A when the temporary tube enlargement is performed on the tube group A having a different length or the like. do.

On this moving table 14, a temporary tube enlargement jig portion 20 for providing temporary tube enlargement is provided at the opening end of the tube for heat exchanger. The temporary tube expanding jig part 20 is installed to be movable by a rail 19 provided on the movable table 14, and is supported by the driving force of the hydraulic cylinder 21 fixed to the movable table 14. Go along 19).

In the vicinity of the front end surface of the temporary tube expanding jig portion 20, cylinders 22a and 22b are provided, and the tube group A moved by the endless belt V by the cylinders 22a and 22b. The silver is positioned so that each open end of the heat exchanger tube is positioned at a predetermined position.

As shown in FIG. 3, the frame 23 constituting the temporary tube expanding jig part 20 is installed on the rail 19 so as to be movable, and is fixed to the movable table 14. It moves to the left and right directions by (21). Inside the frame 23, a hydraulic cylinder 24 is provided. This hydraulic cylinder 24 moves the plate plate 27a which fixes the rear end part of the temporary tube expansion pin 26 which the pin 25 protrudes from a front end surface to the left-right direction. In addition, the pin 25 of the temporary tube expanding pin 26 is inserted into the temporary tube expanding punch 28 whose one end is fixed to the plate plate 27b fixed to the frame 23. Therefore, by moving the frame 23 to the left and right direction by the hydraulic cylinder 21, the position of the temporary pipe expanding pin 26 and the temporary pipe expanding punch 28 can be adjusted, and the hydraulic cylinder 24 By moving the plate plate 27a in the left and right direction, the insertion degree of the pin 25 of the temporary tube expanding pin 26 into the temporary tube expanding punch 28 can be adjusted.

3 shows the state which the hydraulic cylinder 24 protruded the rod 24a most so that the plate board 27a may contact the frame 23.

This temporary tube expanding pin 26 and temporary tube expanding punch 28 are shown in FIGS. 4A and 4B. The temporary tube expanding punch 28 shown in FIGS. 4A and 4B is formed of a main body portion 30 having a flat cross section 29 and a front end portion 32 protruding from the flat cross section 29. The front end portion 32 has a larger diameter than the front end side and the rear end side of the intermediate portion 33.

In addition, although the temporary pipe expanding punch 26 is divided | segmented into the longitudinal direction (not shown), the three-divided member is integrated by the clamping force of the ring-shaped elastic members 34 and 34. As shown in FIG. The larger the number of divisions of the temporary tube expanding punch 26 is, the more preferable.

In the center of the temporary tube expanding punch 28, a tapered inner hole 36 whose inner diameter gradually becomes a small diameter in the direction of the front end 32 is formed along the central axis. Such a tapered inner hole 36 is formed. ), The pin 25 of the temporary tube magnifying pin 26 is inserted as shown in FIG. 4A. As shown in Fig. 4A, since the pin 25 is tapered in shape as the outer diameter is smaller, the pin 25 is driven into the hydraulic cylinder 24 so as to ring the pin 25 in a ring shape. When it is inserted into the tapered inner hole 36 against the clamping force of the elastic members 34 and 34, the outer diameter of the temporary tube expanding punch 28 can be enlarged and reduced in accordance with the insertion amount of the pin 25. .

In addition, since the reference side apparatus 10a of the temporary tube dilator 10 is the same structure as the position adjustment side apparatus 10b, except that the movable stand 14 of the position adjustment side apparatus 10b is a fixed stand, Detailed description will be omitted.

Next, among the tube expanding apparatuses shown in FIG. 1, the first tube expanding apparatus 40 will be described based on FIGS. 5A to 8. The primary tube expanding apparatus 40 includes a tube expanding mechanism in each of the reference side apparatus 40a and the position adjusting side apparatus 40b. The heat exchanger tubes of the tube group (A) have an opening end projecting from each of both end sides of the laminate formed by laminating the fins, and are intended to expand the tube for the heat exchanger alternately from each opening end of the heat exchanger tube.

Of these primary tube expanding apparatuses 40, a schematic diagram of the reference side apparatus 40a is shown in Figs. 5A and 5B. In FIG. 5A, the rear end portion of the mandrel 43 in which the tube enlargement billet is attached to the front end portion and the intermediate portion is guided by the guide plates 45 and 45... Is fixed to the reciprocating body 44. The reciprocating member 44 is connected to a ball screw 46 to which a pulley 45 is fixed, one end of which transmits the driving force of the servomotor 42 (FIG. 1), and to drive the servomotor 42. It can move to the left and right directions. For this reason, when moving the reciprocating body 44 in the direction of the tube group 16 located between the reference | standard side apparatus 40a and the position adjustment side apparatus 40b, it attaches to the front end of the mandrel 43. FIG. The primary tube enlargement can be performed by inserting the obtained tube enlargement billet into the tube for heat exchangers constituting the tube group 16.

In addition, both ends of the reciprocating member 44 and the guide plates 45, 45 are passed through the guide shafts 47, 47 (Fig. 1), and move along the guide shafts 47, 47. .

In this reference side device 40a, as shown in Fig. 5B, a chuck device 48 for holding the opening end of the tube for heat exchanger is installed at the front end on which the tube enlargement billet of the mandrel 43 is mounted. It is.

As shown in FIG. 6, the chuck device 48 has both end portions fitted into the guide shafts 47 and 47 (FIG. 1), and a chuck plate through which the mandrel shaft 43 is inserted. A cylindrical clamp chuck 50 having a rear end fixed to the plate plate 51 fixed to 49) and a front end protruding from the plate plate 55 through the plate plates 53 and 55, and the plate plate. It consists of a fastening sleeve 52 which is secured to the rear end portion 53, penetrates the plate plate 55, protrudes from the plate plate 55, and is slidably attached to the outer circumferential surface of the clamp chuck 50. A gripper is installed.

In the clamp chuck 50 constituting such a gripper, a tube enlargement billet 54 attached to the front end of the mandrel 43 can be inserted along the central axis thereof.

In addition, the chuck device 48 is provided with a hydraulic cylinder 56 for advancing and retracting the chuck plate 49 and advancing the clamp chuck 50 and the fastening sleeve 52 on the base table (not shown). The hydraulic cylinder 57 which advances and retreats only the fastening sleeve 52 by advancing and retracting the plate board 53 and 55 with respect to the plate board 51 is provided in the chuck plate 49. As shown in FIG.

As shown in FIGS. 7A and 7B, the clamp chuck 50 shown in FIG. 6 is a cylindrical member into which the opening end of the heat exchanger tube can be inserted, and a plurality of slits (not shown) are provided in the longitudinal direction. It is formed so that diameter reduction is possible. The clamp chuck 50 is provided with protrusions 58, 58... Which protrude intermittently outwardly on the outer circumferential surface thereof and whose top surface is formed on a flat surface. The fastening sleeve advances and retracts by sliding to each of the flat top surfaces of the projections 58, 58, and the clamp chuck 50 is fastened.

In addition, the inner peripheral surface of the front end of the clamp chuck 50 is also provided with a protrusion 59 projecting inwardly of the clamp chuck 50, so that the opening end of the heat exchanger tube inserted into the clamp chuck 50 can be gripped. have.

In addition, it is preferable that the inner diameter of the clamp chuck 50 is a diameter at which the tube enlargement billet 54 attached to the front end of the mandrel 43 is freely retractable in a state of being fastened by the fastening sleeve 50. .

As described above, the position adjusting side device 40b constituting the primary tube expanding device 40 in pairs with the reference side device 40a described above is provided to the hydraulic cylinder 60. As a result, the reciprocating body 62 having one end of the mandrel 43 is advanced to expand the tube for the heat exchanger.

Moreover, in the position adjustment side apparatus 40b, the mounting table 63 in which the hydraulic cylinder 60 and the reciprocating body 62 were mounted is a movable table. That is, the mounting table 63 is provided so as to be movable in the left and right directions along the rail 64 provided on the base 61, and at one end thereof, the driving force of the servomotor 41 (Fig. 1) is applied. The pulley 65 to be transmitted is connected to the fixed ball screw 66, and can be moved to the left and right directions by the drive of the servomotor 41 to adjust its position. When the servomotor 41 moves the mounting table 63 to a predetermined position so as to conform to the length of the tube group A when the primary tube enlargement is performed on the tube group A having a different length or the like. And the like. In addition, as will be described later, when the first tube is enlarged, when the contracting force of the heat exchanger tube becomes larger than the repulsive force of the chuck device 48, a part of the contraction of the heat exchanger tube is allowed to allow heat exchange from the chuck device 48. The servomotor 41 is also driven to move the mounting table 63 so that the instrument tube does not fall out.

Also in the position adjusting side device 40b, the same clamp device 48 or the like used for the reference side device 40a is used as the clamp device for holding the opening end of the heat exchanger tube.

Finally, the second and third tube expanding apparatuses 80 of the tube expanding apparatus shown in FIG. 1 will be described with reference to FIGS. 9 to 11.

As shown in FIG. 9, the position adjustment side apparatus 80b of the 2nd and 3rd tube dilator 80 shown in FIG. 1 moves along the rail 83 provided on the base 82, 84) is installed to be movable. The movable table 84 is connected to a ball screw 86 to which a pulley 85 that transmits the driving force of the servomotor 81 (FIG. 1) is fixed to one end thereof, and is used to drive the servomotor 81. It can move to a left-right direction and can adjust a position to a predetermined position. The servomotor 81 moves the movable table 84 to a predetermined position so as to conform to the length of the tube group A when the second and third tube enlargement is performed on the tube group A having different lengths or the like. And the like.

On the movable stand 84, second and third tube enlargement portions 87 are formed to form insertion holes with flares at the opening ends of the tubes for heat exchangers. The second and third pipe expanding portions 87 are provided to be movable by rails 88 provided on the movable table 84, and the driving force of the hydraulic cylinder 89 fixed to the movable table 84 is fixed. It moves along the rail 88 by it.

In this way, the cylinders 90a and 90b are provided near the front end surfaces of the second and third tube enlargement portions 87 provided to be movable along the rails 88, and the cylinders 90a and 90b The tube group A moved by the endless belt V is positioned so that each open end of the heat exchanger tube is located at a predetermined position.

As shown in FIG. 10, the frame 91 constituting the second and third pipe expanding portions 87 is provided to be movable on the rail 88, and is fixed to the movable table 84. It moves to the left-right direction by the hydraulic cylinder 89 which exists. Inside the frame 87, a hydraulic cylinder 92 is provided. This hydraulic cylinder 92 moves the plate plate 93 which fixes the rear end part of the flare punch 94 to the left-right direction.

Moreover, the hydraulic cylinders 95a and 95b provided in the frame 91 make the mold members 96a and 96b which form the die into which the front end part of the flare punch 94 insert are perpendicular to the moving direction of the flare punch 94. Moreover, as shown in FIG. It is installed to be movable in the direction.

Therefore, according to the second and third tube enlargement portions 87 shown in FIG. 10, after adjusting the positions of the flare punch 94 and the mold members 96a and 96b by driving the hydraulic cylinder 89, In the die formed by the mold members 96a and 96b by driving the cylinders 95a and 95b, the hydraulic cylinder 92 can be driven to enter the front end of the flare punch 94.

10 shows the state in which the hydraulic cylinder 92 protrudes the rod 92a so that the plate plate 93 may contact the frame 91.

As shown in FIG. 11, the flare punch 94 shown in FIG. 10 has an insertion hole for forming an insertion hole for inserting one end of the connecting pipe 208 (FIG. 12) into the open end of the heat exchanger tube at its front end. The formation part 94a and the flare formation part 94b which forms a flare in the opening edge of this insertion opening are formed. The outer diameter of this insertion hole formation part 94a is larger than the largest diameter of the tube enlargement billet 54 normally used for the primary tube enlargement apparatus 40. As shown in FIG.

In addition, the reference side apparatus 80a of the 2nd and 3rd tube dilator 80 is a position adjustment side apparatus 80b, except that the movable stand 84 of the position adjustment side apparatus 80b is a fixed stand. Since the configuration is the same, detailed description is omitted.

As described above, using the tube expanding apparatus shown in Figs. 1 to 11, when expanding the tube for the heat exchanger, the reference side apparatuses 10a, 40a, and 80a are first applied to the length of the tube group A for tube expanding. ) And the servomotors 11, 41, 81 are adjusted by adjusting the distance between the position adjusting side apparatuses 10b, 40b, 80b to suit the length of the tube group A. FIG.

As shown in Fig. 1, the tube group A is the front end from the side plate 104 which forms one surface side of the laminate formed by laminating a plurality of fins 102, 102... The front end of the heat exchanger tube 100 is fitted into each of the through holes of the fins 102, 102.

Next, the tube group A is placed between the reference side apparatus 10a and the position adjustment side apparatus 10b of the temporary tube dilator 10, and temporary tube enlargement is performed. The operation of the position adjusting side device 10b in this temporary tube enlargement will be described.

In the temporary tube expanding jig portion positioned at the predetermined position by the servomotor 11, the hydraulic cylinder 21 is driven to move the frame 23, and as shown in FIG. 4A, the temporary tube expanding punch 28 Is inserted into the opening end of the corresponding tube for heat exchanger 100 of the tube group A.

In FIG. 4A, the temporary tube expanding pin 26 is retracted by the hydraulic cylinder 24, and the tapered pin 25 also has a ring-shaped elastic member 34 as a whole of the temporary tube expanding punch 28. Due to the tightening force of 34), it is retracted so as to be reduced in diameter. For this reason, even if the intermediate part 33 is the front end 32 of the temporary tube expansion pin 26 whose outer diameter is thicker than a front end side and a rear end side, it can be inserted in the opening end part of the tube 100 for heat exchangers.

At this time, the tube 100 for the heat exchanger has not yet been enlarged and is not integrated with the fins 102, 102, and the opening end of the tube 100 for the heat exchanger in which the front end 32 is inserted in the opening end is not integrated. By pressing against the end face 29 of the temporary tube expanding punch 28 from which the front end 32 protrudes, the protruding length protruding from the side plate 104 of the tube 100 for heat exchanger can be easily adjusted. have. For this reason, the protruding length which protrudes from each side plate 104 of the some heat exchanger tube 100 which forms the tube group A can be made to match predetermined length.

In addition, the hydraulic cylinder 24 is driven to advance the temporary tube expanding pin 26, and as shown in 4b, the pin 25 resists the clamping force of the ring-shaped elastic members 34 and 34 to temporarily expand the tube. By inserting into the tapered inner hole 36 of the punch 28, the entire outer diameter including the front end 32 of the temporary tube expanding punch 28 can be enlarged in diameter. For this reason, the temporary tube enlargement part 106 which imitates the external shape of the front end part 32 of the temporary tube enlargement punch 28 can be formed in the opening edge part of the tube 100 for heat exchangers. In the temporary tube expanding portion 106, a maximum diameter larger than the opening diameter of the opening end is formed in the vicinity of the opening end of the heat exchanger tube 100 and at a predetermined position from the opening end, and the maximum diameter is As shown in FIG. 7B, the diameter is larger than the inner diameter of the tube for the heat exchanger enlarged in the primary tube enlargement. However, the temporary tube expanding portion 106 is subjected to the second and third tube expanding by the flare punch 94 shown in FIG.

After the temporary tube enlargement ends, the temporary cylinder enlargement including the front end 32 is driven by the fastening force of the ring-shaped elastic members 34 and 34 by driving the hydraulic cylinder 24 to retract the pin 25. By reducing the outer diameter of the entire punch 28, the front end 32 of the temporary tube expanding punch 28 can be pulled out from the opening end of the heat exchanger tube 100.

Here, when the shape of the temporary tube enlargement part 106 is the same diameter from the opening end of the heat exchanger tube 100 to a predetermined position, a crack occurs at the opening end of the heat exchanger tube 100 with a sudden tube enlargement force. There is a case.

The tube group A in which the temporary tube enlargement is applied to the opening end of each tube 100 for heat exchangers is conveyed to the 1st tube enlargement apparatus 40 by the endless belt V shown in FIG. Differential tube enlargement is performed and the fin 102 and the tube 100 for heat exchanger are integrated.

In the tube expanding apparatus shown in FIG. 1, the primary tube expanding is performed by holding the opening end of the heat exchanger tube 100 by the chuck device 48 as shown in FIGS. 7A and 7B. In this chuck device 48, the hydraulic cylinder 56 (FIG. 6) is driven, and as shown in FIG. 7A, the temporary tube enlargement portion 106 of the tube 100 for heat exchanger is clamped in the clamp chuck 50. As shown in FIG. The clamp chuck 50 and the clamp sleeve 52 are advanced to a position where the opening end portion to be included is inserted.

In addition, the hydraulic cylinder 57 is driven, and the plate plates 53 and 55 are advanced with respect to the plate plate 51 to advance only the fastening sleeve 52, and as shown in FIG. 7B, the clamp chuck 50 The fastening sleeve 52 extends on the projection 58 formed on the outer peripheral surface of the front end of the front end, and the clamp chuck 50 is fastened to hold the open end of the heat exchanger tube 100. At the time of holding, the temporary tube expanding portion 106 formed at the opening end of the heat exchanger tube 100 inserted into the clamp chuck 50 is formed by the protrusion 59 formed on the inner circumferential surface of the front end of the clamp chuck 50. It can be easily and reliably gripped.

Subsequently, the reciprocating body 44 of the reference side device 40a of the primary tube dilator 40 or the reciprocating body 62 of the position adjusting side device 40b are moved to the servomotor 42 or the hydraulic cylinder 60. Drive to advance, and the tube enlargement billet 54 attached to the front end of the mandrel 43 is inserted into the heat exchanger tube 100 to perform the primary tube enlargement. In the first tube enlargement, since the opening end of the heat exchanger tube 100 is gripped by the clamp chuck 50 and the clamp sleeve 52, the heat exchanger tube 100 shrinks due to tube enlargement. As much as possible. Moreover, since the temporary tube enlargement part 106 is formed in the predetermined position of the opening end part of the heat exchanger tube 100, the location hold | maintained at the heat exchanger tube 100 can be made constant always, and heat exchange by tube enlargement is carried out. It is possible to prevent the contraction of the tube 100 for as much as possible, and at the same time, the projecting length of the tube 100 for heat exchanger protruding from the side plate 104 after the primary tube enlargement can be as constant as possible.

In the primary tube enlargement apparatus 40 of the tube enlargement apparatus shown in FIG. 1, since the primary tube enlargement is too long only on one side of the opening end of the heat exchanger tube 100, the reference side apparatus 40a is used. By alternately performing the primary tube enlargement with the position adjusting side device 40b, the primary tube enlargement can be performed over the entire length of the long tube 100 for heat exchanger. This primary tube enlargement performed the primary tube enlargement by the position adjustment side apparatus 40b first, and then performed the primary tube enlargement by the reference side apparatus 40a.

In such primary tube enlargement, in either primary tube enlargement of the position adjustment side apparatus 40b and the reference side apparatus 40a, each opening end part of the heat exchanger tube 100 is a clamp chuck ( 50) and the clamp sleeve 52, the grip by the tube expansion of the heat exchanger tube 100 can be substantially prevented.

The tube enlargement length for performing primary tube enlargement by the reference side apparatus 40a is longer than the tube enlargement length for performing primary tube enlargement by the position adjustment side apparatus 40b. For this reason, when the primary tube is enlarged by the reference side device 40a, the contracting force of the heat exchanger tube 100 becomes larger than the holding force of the clamp chuck 50 and the clamp sleeve 52, and thus the tube 100 for the heat exchanger. ) May not be able to hold. In this case, the position of the mounting table 63 of the positioning side device 40b is adjusted by the servomotor so that the contracting force of the heat exchanger tube 100 is equal to or less than the holding force of the clamp chuck 50 and the clamp sleeve 52. 41) may be adjusted by driving.

The tube group A in which the primary tube enlargement is given to each heat exchanger tube 100 and the fin 102 and the heat exchanger tube 100 are integrated is formed by the endless belt V shown in FIG. An insertion hole with a flare is formed at the opening end of the tube 100 for heat exchanger, which is transferred to the secondary and tertiary tube expanding apparatus 80.

In the second and third tube expanding apparatuses 80, first, the hydraulic cylinder 89 is driven, and the heat exchanger is used between the mold members 96a and 96b provided in the second and third tube expanding portions 87. The second and third tube enlargement portions 87 are moved to the position where the opening end portion of the tube 100 is fitted.

Further, in the second and third tube enlargement portions 87 moved to predetermined positions, the hydraulic cylinders 95a and 95b are driven to form dies by the mold members 96a and 96b. The opening end of the heat exchanger tube 100 is fitted in this die. Since the temporary tube expanding portion 106 is formed at the opening end of the heat exchanger tube 100, the opening end of the heat exchanger tube 100 is held in a die formed by the mold members 96a and 96b. Is in.

Subsequently, the hydraulic cylinder 92 is driven to insert the front end of the flare punch 94 into the opening end of the heat exchanger tube 100 whose opening end is gripped, as shown in FIG. Form 108.

On the front end of the flare punch 94, as described above, an insertion opening forming portion 94a for forming an insertion opening for inserting one end of the connecting pipe 208 (Fig. 12) at the opening end of the tube for heat exchanger, The flare formation part 94b which forms a flare is formed in the opening edge of this insertion hole. For this reason, by inserting the front end of the flare punch 94 into the opening end of the heat exchanger tube 100, the insertion opening is first inserted into the opening end of the heat exchanger tube 100 by the insertion hole formation part 94a of the flare punch 94. The secondary tube enlargement to be formed is carried out, and then the third tube enlargement is formed by forming a flare by the flare forming portion 94b at the opening end of the insertion hole formed by the secondary tube enlargement.

In the second and third tube enlargement, as described above, since the temporary tube enlargement portion 106 is formed at the opening end of the tube 100 for the heat exchanger, the thrust of the flare punch 94 is applied to the heat exchanger. The flare may be formed without inserting the tube 100 into the insertion portion 108 with the flare attached thereto, and compared with the case where the second and third tube enlargements are performed without forming the temporary tube enlargement portion 106. It is possible to prevent the occurrence of cracks in the attached insertion hole.

As mentioned above, although the tube dilator shown in FIGS. 1-11 is a horizontal tube dilator, of course, this invention can be applied to a vertical tube dilator.

Moreover, instead of the tube group A which consists of a straight tube heat exchanger tube which the opening edge protrudes in each of the both end surface sides of a laminated body, a U-shaped part protrudes from one end surface side of a laminated body, and Tube expansion can also be performed by this invention also about the tube group which consists of a U-shaped heat exchanger tube which an opening edge part protrudes from the other surface side. When the tube group consisting of such a U-shaped heat exchanger tube is enlarged using the tube expanding apparatus shown in FIG. 1, the U-shaped tube of the heat exchanger tube protruding from one surface side of the laminate in the reference side apparatus is used. Temporary tube enlargement, primary tube enlargement, and second and tertiary tube enlargements are provided at the opening end of the tube for heat exchanger protruding from the other surface side of the laminate in the position adjustment side device, through which the rod is inserted into the shape portion. Is carried out. In this way, when a U-shaped heat exchanger tube is used, the receiver receiving the U-shaped portion can be made unnecessary by holding the opening end of the heat exchanger tube and performing primary tube enlargement or the like.

1 to 11, the temporary tube enlargement, the primary tube enlargement, and the second and third tube enlargement are continuously performed, but the temporary tube enlargement, the primary tube enlargement, and Each apparatus of 2nd and 3rd tube enlargement may be separately installed in a different place, and each tube enlargement may be performed. In this case, the temporary tube enlargement and the primary tube enlargement are continuously performed to integrate the heat exchanger tube with the fins to improve handling, and then the tube for the heat exchanger in another place where the second and third tube enlargement devices are installed. It is preferable to perform the second and third tube expansion.

According to the present invention, before the first tube enlargement, a temporary tube enlargement is made near the opening end of the heat exchanger tube and at a predetermined position from the opening end to a larger diameter than the opening diameter of the opening end. As in the case of forming an insertion hole with a flare at the opening end of the heat exchanger tube, even if the opening end of the heat exchanger tube is greatly enlarged, it is possible to prevent cracks that are likely to occur at the enlarged opening end. For this reason, when the insertion hole with flare is formed in the opening edge part of the tube for heat exchangers, the insertion hole with a balanced flare can be formed, and the defective rate by a crack generation can be reduced in the insertion hole with flare.

In the case of expanding the tube by holding the outer circumferential side of the open end of the heat exchanger tube during the first tube enlargement, the presence of the temporary pipe enlargement portion at a predetermined position from the open end of the heat exchanger tube, The opening end of the tube can be easily and reliably gripped at a predetermined position, and the tube can be enlarged over the entire length of the tube for heat exchanger. For this reason, each of the heat exchanger tubes in which the primary tube expansion is completed can match each opening end position to a predetermined position. By forming an insertion hole with a flare at the opening end of the heat exchanger tube, the opening end of the insertion hole with the flare can also be matched to a predetermined position, thereby making it possible to automatically mount a connecting pipe connecting the tubes for the heat exchanger. Can be.

In the case where the primary tube enlargement and the second and third tube enlargement are carried out to the heat exchanger tube by holding the opening, the driving force in the tube enlargement direction of the heat exchanger tube is substantially applied to the fin integrated with the heat exchanger tube. It is possible to simplify the clamp device, the guard device, and the like for positioning the laminate without being applied.

Claims (12)

When expanding the tube for heat exchanger which passed through the said viewing hole so that the front-end part protrudes from the one end surface side of the laminated body formed by laminating | stacking the several sheets of fins provided through the through-hole, Temporary tube enlargement is performed at the front end of the heat exchanger tube protruding from the laminate, and the predetermined position from the opening end of the front end after the temporary tube enlargement has a larger diameter than the opening diameter of the opening end. After forming, In order to integrate the fin and the tube for the heat exchanger, a primary tube enlargement is performed over the entire length of the tube for the heat exchanger. The flare is attached to the opening end of the heat exchanger tube which carried out the primary tube expansion, and the flare which makes it possible to insert the one end of the connection pipe which connects the several heat exchanger tubes inserted in the said laminated body with each other is provided. A method of expanding a tube for a heat exchanger, characterized in that the second and third tube enlargement forming an insertion hole is performed. 3. The temporary tube enlargement of the tube for heat exchanger according to claim 1 or 2, which protrudes from both end faces of the laminate in order to substantially prevent contraction of the tube for heat exchanger due to tube enlargement during the primary tube enlargement. A tube enlargement method for a tube for heat exchanger, characterized in that the tube is enlarged by holding the outer circumferential side of the open end portion. 4. The tube expansion method according to claim 3, wherein the outer circumferential side of the opening end portion in which the tube for heat exchanger has been temporarily expanded is gripped by a cylindrical gripping hole. The heat exchanger according to any one of claims 1 to 4, wherein the primary tube enlargement is performed by alternately inserting tube enlargement billets from both open ends of the heat exchanger tubes protruding from both ends of the laminate. Tube expansion method. In the tube expanding apparatus of the heat exchanger tube which enlarges the heat exchanger tube which passed through the said through hole so that a front end part protrudes from the one end surface side of the laminated body formed by laminating | stacking the several sheets of fins provided through the through hole, Temporary tube expansion is performed on the front end of the heat exchanger tube protruding from one end surface side of the laminate, and the predetermined position from the opening end of the front end after the temporary tube expansion is larger than the opening diameter of the opening end. A temporary tube dilator forming a temporary tube dilator, And a primary tube enlargement apparatus for performing primary tube enlargement over the entire length of the heat exchanger tube to integrate the fin and the tube for heat exchanger. 7. A flare according to claim 6, wherein a flare is attached to an opening end of the heat exchanger tube subjected to the primary tube enlargement so as to be able to insert one end of the connection tube connecting the plurality of heat exchanger tubes inserted into the stack to each other. Tube expansion apparatus for a heat exchanger tube, characterized in that it comprises a second, third tube expanding device forming an insertion hole. 7. The temporary tube expanding apparatus according to claim 6, wherein when the front end is inserted into the heat exchanger tube, the outer diameter of the portion located at a predetermined position from the opening end of the heat exchanger tube is larger in diameter than the rear end, and the front end. The temporary tube enlargement punch of which the outer diameter of a part is freely enlarged and reduced in diameter, the temporary tube enlargement pin provided with the pin which enlarges the outer diameter of the front end part when inserted into the said temporary pipe enlargement punch, and the said temporary tube enlargement pin And a drive device for driving the pin into and out of the temporary tube enlargement punch. 7. The outer circumferential side of each of the protruding portions of the heat exchanger tube protruding from both end faces of the laminate so as to substantially prevent contraction of the heat exchanger tube due to tube enlargement. Tube expansion apparatus of the tube for heat exchangers characterized in that it comprises a holding means for holding. 10. The gripping means according to claim 9, wherein the gripping means includes a cylindrical clamp chuck in which a temporary tube-expanded opening end of the heat exchanger tube is inserted to reduce diameter, and an opening end of the heat exchanger tube inserted into the clamp chuck. And a clamp sleeve which is slidably moved along the outer circumferential surface of the clamp chuck, and the clamp chuck is provided so as to be fastened in the direction of diameter reduction. The projection is formed in the inner surface side of the front end of a clamp chuck so that when the clamp chuck is fastened by a clamp sleeve, the temporary tube-expanded opening end of the heat exchanger tube inserted into the clamp chuck is walked. Tube enlargement device of the heat exchanger tube, characterized in that. 8. The second and third tube expanding apparatuses according to claim 7, wherein the front end portion is inserted into the opening end of the tube for the heat exchanger, and the opening end has an insertion hole having a flare attached to allow the insertion of one end of the connecting pipe. Tube expanding device of the heat exchanger tube characterized in that it comprises a flare punch.