WO2001034322A1

WO2001034322A1 - Method and device for expanding heat exchanger tube

Info

Publication number: WO2001034322A1
Application number: PCT/JP1999/006271
Authority: WO
Inventors: Yoshihiro Baba
Original assignee: Hidaka Seiki Kabushiki Kaisha
Priority date: 1999-11-10
Filing date: 1999-11-10
Publication date: 2001-05-17
Also published as: KR20010106089A; CN1330576A

Abstract

A heat exchanger tube expanding device whereby cracking is difficult to occur at flared connection port when the flared connection port into which one end part of a connection tube for connecting heat exchanger tubes to each other is inserted is formed at the opening end part of the heat exchanger tube and which expands the heat exchanger tube inserted into a through-hole provided into a plurality of fins so that the tip part of a laminated body formed by laminating the plurality of fins is projected from one end side of the laminated body, characterized in that a temporary tube expanding device (10) capable of temporarily expanding a tube larger in diameter than the opening at the opening end, a primary tube expanding device (40) which performs the primary tube expansion over the entire length of the heat exchanger tubes and integrates the fins with the heat exchanger tubes, and second and third tube expanding device (80) which forms the flared insert port allowing to insert one end part of the connection tube for interconnecting the plurality of heat exchanger tubes inserted into the laminated body into the opening end part of the heat exchanger tubes are provided at a specified position near the opening end of the heat exchanger tubes projected from one end side of the laminated body.

Description

TECHNICAL FIELD The present invention relates to a method for expanding a tube for a heat exchanger and an apparatus for expanding the tube.

The present invention relates to a method for expanding a tube for a heat exchanger and an apparatus for expanding the tube, and more particularly, to a method for inserting a plurality of fins having perforated holes into a laminated body formed by laminating the plurality of fins. The present invention relates to a method for expanding a tube for a heat exchanger for expanding a tube for a heat exchanger and an apparatus for expanding the tube. Background art

As shown in Fig. 12, heat exchangers used in homes, automobiles, coolers used in factories, etc. are made up of multiple sheets with through holes 200, 200 The heat exchanger tubes 200, 206 inserted through the through holes 200, 200, respectively, into the laminate 204 formed by stacking the fins 202, 202 ■ · The tube is expanded over the entire length, and the fin 202 and the heat exchanger tube 206 are integrated.

At the opening end protruding from the laminated body 204 of the heat exchanger tubes 206 integrated with the fins 202 by such expansion, heat exchanger tubes 206 ′ are mutually connected. An insertion port 210 with a flare is formed for inserting one end of a connection pipe 208, 208, which is connected to the pipe. The insertion port 210 with flares is conventionally used to expand the heat exchanger tubes 206, 206, and to integrate them with the fins 202, 202 It is formed by inserting a flare punch for forming an insertion port with a flare into the open end of the exchanger tube 206. Disclosure of the invention

In such a conventional method of forming the insertion port 210 with a flare, a crack or the like occurs in the insertion port 210 with a flare formed at the opening end of the tube 206 for the heat exchanger. Sometimes. A heat exchanger with cracks is treated as a defective product. In particular, recently, in response to the demand for lighter heat exchangers, heat exchanger tubes that are thinner and have spiral grooves formed on the inner wall are being adopted, and cracks occur in the insertion holes with flares. It is becoming easier.

When the heat exchanger tube 206 is expanded over its entire length, the heat exchanger tube 206 contracts due to the expansion. The degree of shrinkage of the heat exchanger tubes 206 varies from one heat exchanger tube 206 to another. For this reason, in the heat exchanger tubes 206, 206 ··· which have been expanded, the protruding length protruding from the laminate 204 (the length from the end face to the open end of the laminate 204). ) Differs for each heat exchange tube 206. Therefore, even if an insertion port with a flare is formed at the opening end of the heat exchanger tube 206, the protrusion length of the heat exchanger tube 206 (the insertion with the flare from the end face of the laminated body 204) can be prevented. Similarly, the length to the opening end of the mouth also becomes uneven between the heat exchanger tubes 206.

In this way, if the protrusion lengths of the heat exchanger tubes 206 are not uniform, the open end positions of the flared open ends are not constant, so that the connecting pipes 208, 208 using a robot or the like are used. · It is difficult to automatically attach to each flared slot.

Therefore, a first object of the present invention is to form an insertion port with a flare at the open end of the heat exchanger tube to insert one end of a connecting pipe for interconnecting the heat exchanger tubes. An object of the present invention is to provide a method and an apparatus for expanding a tube for a heat exchanger, in which a crack or the like is hardly generated in the expanded end even if the open end of the tube for a heat exchanger is greatly expanded.

Further, a second object of the present invention is to provide a flared inlet for each heat exchanger tube projecting from the laminate when a flared inlet is finally formed at the open end of the heat exchanger tube. The length of the protrusion from the open end of the tube to the laminate can be made as uniform as possible, and even if an inlet is formed, the formed tube with a flare is less likely to crack, etc. An object of the present invention is to provide a pipe expansion method and a pipe expansion device.

The inventor of the present invention has conducted various studies to solve the above-mentioned problems. As a result, when the open end of the tube for a heat exchanger is rapidly expanded, a crack is easily generated at the open end, but a predetermined position from the open end. If the tube is expanded in advance, the open Even if the mouth end is expanded greatly, cracks are unlikely to occur at the open end.When expanding the heat exchanger tube over its entire length, grasp the open end of the heat exchanger tube and expand it. Through this, the inventors have found that the amount of shrinkage of the heat exchanger tube due to the expansion and the variation thereof can be reduced as much as possible, and have reached the present invention. That is, the present invention relates to a heat exchanger for a heat exchanger, which is inserted through the through-hole so that a tip end protrudes from one end surface side of a laminated body formed by stacking a plurality of fins having the through-hole. When the tube is expanded, a temporary expansion is performed on the distal end of the heat exchanger tube protruding from the laminate, and a predetermined position from the open end of the distal end after the temporary expansion is the open end of the open end. After forming the temporary expanded portion having a diameter larger than the opening diameter, the first expansion is performed over the entire length of the heat exchanger tube in order to integrate the fin and the heat exchanger tube. One of the features is the method of expanding tubes for heat exchangers.

In the method for expanding a heat exchanger tube according to the present invention, the plurality of heat exchanger tubes inserted into the laminate are interconnected to an opening end of the heat exchanger tube subjected to the first expansion. By performing the second and third expansions to form a flared inlet that allows one end of the connecting pipe to be inserted, a crack-free flared inlet can be easily formed.

Further, in order to substantially prevent shrinkage of the heat exchanger tube due to the expansion at the time of the first expansion, the open end of the heat exchanger tube, which protrudes from both end surfaces of the laminate, where the temporary expansion is performed. By gripping the outer peripheral side of the section and expanding the pipe, the open ends of the flared insertion ports formed at the respective open ends of the heat exchanger tube can be aligned. At this time, by grasping the outer peripheral side of the opening end portion of the tube for the heat exchanger where the temporary expansion has been performed by the tubular grasping tool, the tube for the heat exchanger can be easily and reliably grasped. .

Furthermore, the first expansion is performed by alternately inserting expansion tubes from both open ends of the heat exchanger tubes protruding from both ends of the laminate, so that even long heat exchanger tubes can be extended to the full length. Primary expansion can be performed over the entire area.

Also, the present invention provides a heat exchanger, wherein a tip portion protrudes from one end surface side of a laminated body formed by laminating a plurality of fins having perforated holes. In a tube expanding apparatus for a heat exchanger for expanding a tube for a heat exchanger, a temporary expansion is performed on a distal end portion of the heat exchanger tube protruding from one end face side of the laminated body, and the temporary expansion is performed from an opening end of the distal end portion. A temporary expansion device that forms a temporary expansion portion whose diameter is larger than the opening diameter of the opening end, and a first expansion is performed over the entire length of the heat exchanger tube to exchange heat with the fin. A tube expansion device for a heat exchanger, comprising: a first tube expansion device for integrating a tube for a device.

In the heat exchanger tube expanding apparatus according to the present invention, the plurality of heat exchanger tubes inserted into the laminate are mutually connected to the open end of the heat exchanger tube subjected to the primary expansion. The second and tertiary expansion devices that form an insertion port with a flare that allows the insertion of one end of the connecting pipe to be connected can be used to expand the insertion port with a flare without cracks by using a single heat exchanger tube expansion device. It can be easily formed.

In the second and third tube expansion devices, the distal end is inserted into the open end of the heat exchanger tube, and the open end is formed with a flared inlet through which one end of the connecting pipe can be inserted. Those having a flare bonch can be suitably used.

As a temporary pipe expansion device used in the pipe expansion device according to the present invention, an outer diameter of a portion located at a predetermined position from an open end of the heat exchanger tube when a distal end portion is inserted into the heat exchanger tube. Are larger in diameter than the rear end side, and the outer diameter of the front end portion is provided to be freely expandable and contractible. By using a temporary expansion device provided with a temporary expansion bin provided with a bottle for increasing the outer diameter, and a driving device for driving the pin of the temporary expansion pin so as to be inserted into and removed from the temporary expansion bonnet. Temporary expansion can be easily performed at a predetermined position from the open end of the heat exchanger tube.

Further, each of the heat exchanger tubes projecting from both end faces of the laminated body is used as a primary tube expansion device so that the heat exchanger tubes can be substantially prevented from contracting due to the tube expansion. By using a primary expansion device equipped with a gripping means for gripping the outer peripheral side of the section, the opening ends of the heat exchanger tubes after the primary expansion has been completed can be aligned. With a flare formed at the opening end of one tube The insertion ends of the insertion openings can be aligned.

Here, as the gripping means, a tubular crumb chuck formed by inserting the temporarily expanded opening end of the heat exchanger tube so as to be reduced in diameter, and inserted into the clamp chuck. A clamp sleeve that slides along the outer peripheral surface of the clamp chuck so as to grip the open end of the heat exchanger tube, and that is capable of clamping the clamp chuck in the radial direction. The gripping means consisting of the following can be suitably used.

This gripping means locks the temporarily expanded open end of the heat exchanger tube inserted into the clamp chuck when the clamp chuck is tightened by the clamp sleeve. By using a protrusion having a projection formed on the inner surface of the tip of the clamp chuck, the temporarily expanded open end of the heat exchanger tube can be easily and reliably gripped.

Usually, a long tube is cut into a predetermined length for use as a heat exchanger tube. For this reason, the open end of the heat exchanger tube is somewhat hardened by heat or plastic deformation generated at the time of cutting, and it is considered that a sudden expansion of the tube causes a crack or the like at the open end.

In this regard, in the present invention, the primary expansion is performed by performing a temporary expansion near the opening end of the heat exchanger tube and at a predetermined position from the opening end so as to have a diameter larger than the opening diameter of the opening end. The diameter of the open end can be increased stepwise without applying a sudden pipe expansion force, in other words, an excessive force, to the open end of the projecting portion of the heat exchanger tube. As a result, even if the open end of the heat exchanger tube is expanded greatly, as in the case of forming an insertion port with a flare at the open end of the heat exchanger tube subjected to the primary expansion, the heat is not increased in advance. By providing a temporary expansion at the open end of the exchanger tube, a crack that easily occurs at the expanded open end can be prevented, and the first problem of the present invention can be solved.

Further, in the present invention, in order to substantially prevent the heat exchanger tubes from contracting due to the expansion at the time of the first expansion, each projecting portion of the heat exchanger tubes projecting from both end surfaces of the laminate is provided. When performing tube expansion while gripping the outer peripheral side, the heat-exchanger tube is provided by the temporarily-expanded temporary expansion portion located at a predetermined position from the open end of the heat-exchanger tube. The open end of the tube can be easily and reliably gripped at a predetermined position to expand the tube over the entire length of the heat exchanger tube. For this reason, in each of the heat exchanger tubes for which the primary expansion has been completed, the positions of the respective open ends can be aligned to predetermined positions. In this manner, when the flared insertion port is formed at the opening end of the heat exchanger tube aligned at a predetermined position, the opening end of the formed flared insertion port can also be aligned at a predetermined position.

Moreover, before the first expansion, a temporary expansion having a diameter larger than the opening diameter of the opening end is performed near the opening end of the heat exchanger tube and at a predetermined position from the opening end, Even if the flared inlet is formed, the second problem of the present invention can be solved as a result of preventing the occurrence of cracks and the like which are likely to occur at the open end of the flared insertion port. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a front view showing an example of the pipe expanding device according to the present invention, FIG. 2 is a partial side view of a position adjusting side device 10b constituting the temporary pipe expanding device 10 of the pipe expanding device shown in FIG. 1, Fig. 3 is a partial cross-sectional side view of the temporary expansion section provided in the position adjusting side device 10b shown in Fig. 2, and Fig. 4A shows a state before the temporary expansion by the temporary expansion section shown in Fig. 2. Fig. 4B is an explanatory diagram illustrating the state after temporary expansion by the temporary expansion section shown in Fig. 2, and Fig. 5A is a primary expansion device of the expansion apparatus shown in Fig. 1. Partial side view of the reciprocating body 44 of the reference side device 40b that constitutes 40, FIG. 5B shows the reference side device 4 that constitutes the primary expansion device 40 of the tube expansion device shown in FIG. 6b is a partial side view of the chuck device 48 side, FIG. 6 is a partial sectional side view of the chuck device 48 provided in the reference side device 40b shown in FIG. 5B, and FIG. Reference device 40 shown in Fig. 6 FIG. 7B is an explanatory diagram illustrating a state immediately before the primary expansion is performed using the chuck device 48 of FIG. b. FIG. 7B is a chuck device 48 of the reference side device 40 b shown in FIG. Fig. 8 is an explanatory view for explaining a state of a primary expansion performed by using a pipe. Fig. 8 is a partial side view of a position adjusting side device 40a constituting a primary expansion device 40 of the expansion device shown in Fig. 1. Fig. 9 is a partial side view of the position adjusting side device 80a constituting the second and tertiary tube expanding devices 80 of the tube expanding device shown in Fig. 1, and Fig. 10 is the position adjusting device shown in Fig. 9. Partial cross-sectional side view of the second and third expansion sections provided in the side device 80a, FIG. 11 shows the second and third expansion sections using the second and third expansion sections shown in FIG. FIG. 12 and FIG. 12 are explanatory diagrams for explaining a flared insertion opening formed at the open end of the heat exchanger tube. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is an example of a tube expansion device for a heat exchanger tube according to the present invention, which is a horizontal tube expansion device. The tube expansion device shown in Fig. 1 expands a heat exchanger tube whose open end protrudes from each of both end surfaces of a laminated body formed by laminating a plurality of fins with through holes. It is.

The pipe expansion device shown in FIG. 1 has a diameter larger than the opening diameter of the open end near the open end of the heat exchanger tube protruding from one end side of the laminate and at a predetermined position from the open end. Heat exchange with a temporary expansion device 10 that can perform temporary expansion, and a primary expansion device 40 that performs primary expansion over the entire length of the heat exchanger tube and integrates the fin with the heat exchanger tube The open end of the heat exchanger tube is inserted so that one end of the connecting pipe that interconnects the plurality of heat exchanger tubes inserted into the laminate can be inserted into the open end of the projecting portion of the heat exchanger tube. And a second and third expansion device 80 forming a flared insertion port.

In such a tube expansion device, reference side devices 10a, 40a, 80a serving as references are provided on the left side, and position adjustment side devices 10b, 4 capable of position adjustment are provided on the right side. 0 b and 8 O b are provided. Therefore, each of the position adjusting devices 10b, 40b, and 80b is provided with servomotors 11, 41, and 81 used for position adjustment.

Tube group A consisting of tubes for heat exchangers with open ends protruding from both end surfaces of the laminated body is to be expanded by endless belts V, V, V after the required expansion is completed. Is sent to the device that performs the

First, among the tube expanding devices shown in FIG. 1, the position adjusting device 10b of the temporary tube expanding device 10 will be described with reference to FIGS. 2 to 4B.

The position adjusting device 10b shown in FIG. 2 is composed of rails 1 provided on a base 12. A moving table 14 is provided movably along 3. The second carriage 14 is connected to a ball screw 18 to which a pulley 16 for transmitting the driving force of the servomotor 11 (FIG. 1) is fixed at one end. By the drive of step 1, it can be moved in the left and right direction and adjusted to a predetermined position. The servomotor 11 is driven when the movable base 14 is moved to a predetermined position so as to conform to the length of the tube group A when the tube group A having a different length is temporarily expanded. Is done.

A temporary expansion jig portion 20 for performing temporary expansion at the open end of the heat exchanger tube is provided on the movable table 14. The temporary pipe expansion jig portion 20 is provided so as to be movable by a rail 19 provided on the movable base 14, and is driven by a driving force of a hydraulic cylinder 21 fixed to the movable base 14. Travel along rails 19.

Cylinders 22a and 22b are provided in the vicinity of the end face of the temporary pipe expansion jig portion 20, and are moved by the endless belt V by the cylinders 22a and 22b. The tube group A is positioned so that each open end of the heat exchanger tube is located at a predetermined position.

As shown in FIG. 3, the frame 23 constituting the temporary pipe expanding jig portion 20 is provided on a rail 19 so as to be movable, and a hydraulic system fixed to the moving table 14 is provided. It moves to the left and right by the cylinder 21. A hydraulic cylinder 24 is provided inside the frame 23. The hydraulic cylinder 24 moves the plate plate 27a for fixing the rear end of the temporary expansion pin 26 formed by projecting the pin 25 from the front end surface in the left-right direction. Further, the pin 25 of the temporary expansion pin 26 is inserted into a temporary expansion punch 28 having one end fixed to a plate plate 27 b fixed to the frame 23. Therefore, the position of the temporary expansion pin 26 and the temporary expansion bond 28 can be adjusted by moving the frame 23 in the left and right directions by the hydraulic cylinder 21, and the play is performed by the hydraulic cylinder 24. The degree of insertion of the temporary expansion pin 26 into the temporary expansion punch 28 can be adjusted by moving the plate 27 a in the left-right direction.

FIG. 3 shows a state in which the rod 24 a is most protruded so that the plate 23 a comes into contact with the frame 23.

These temporary expansion pins 26 and temporary expansion punches 28 are shown in Figs. 4A and 4B. Show. The anti-expansion punch 28 shown in FIGS. 4A and 4B is formed by a main body 30 having a flat end surface 29 formed thereon and a tip portion 32 protruding from the flat end surface 29. ing. In the front end portion 32, the outer diameter of the intermediate portion 33 is larger than the front end side and the rear end side.

Furthermore, the temporary expansion punch 26 is divided into three parts (not shown) in the longitudinal direction, but the three divided parts are united by the tightening force of the ring-shaped flexible members 34, 34. Have been. Although the number of divisions of the temporary expansion punch 26 is preferably as large as possible, an appropriate number can be set in consideration of the strength of the temporary expansion punch 28 and the like.

A tapered inner hole 36 whose inner diameter becomes smaller in the direction of the tip 32 is formed along the central axis in the center of the temporary tube expanding punch 28. As shown in FIG. 4, the pin 25 of the temporary expansion pin 26 is inserted into the tapered inner hole 36. As shown in FIG. 4A, the pin 25 has a tapered shape in which the outer diameter becomes smaller toward the tip, so that as shown in FIG. 4B, the hydraulic cylinder 24 is driven to Ring-shaped elastic members 34, 34

When inserted into 36, the outer diameter of temporary expansion punch 28 can be enlarged or reduced according to the insertion amount of pin 25.

The reference side device 10a of the temporary expansion device 10 has the same configuration as the position adjustment side device 10b, except that the movable stage 14 of the position adjustment side device 10b is a fixed stage. Detailed description is omitted.

Next, among the tube expansion devices shown in FIG. 1, the primary tube expansion device 40 will be described with reference to FIGS. 5A to 8. The primary expansion device 40 has its reference side device

Each of the 40a and the position adjusting device 40b is provided with a tube expanding mechanism. The heat-exchanger tubes of tube group A have open ends protruding from each end of the laminated body formed by laminating the fins, and the heat-exchange tubes alternately exchange heat from the respective open ends of the heat-exchanger tubes. This is for expanding the dexterity tube.

FIG. 5A and FIG. 5B show schematic diagrams of the reference side device 40a of the primary tube expansion device 40. FIG. In FIG. 5A, the rear end of the mandrel 4 3, with the expansion billet attached to the front end and guided in the middle by the guide plates 45, 45,. It is fixed to. This reciprocating body 4 4 One end is connected to a ball screw 46 to which a pulley 45 for transmitting the driving force of the servomotor 42 (Fig. 1) is fixed. Can be moved to Therefore, when the reciprocating body 44 was moved in the direction of the tube group 16 located between the reference side device 40a and the position adjustment side device 4Ob, it was attached to the tip of the mandrel 43. The first expansion can be performed by inserting the expansion tube into the heat exchanger tubes constituting the tube group 16.

Both ends of the reciprocating body 44 and the guide plates 45, 45- 'are inserted through the guide shafts 47, 47 (Fig. 1). Move. In the reference side device 40a, as shown in FIG. 5B, the tip of the mandrel 43 at which the expansion billet is mounted is a chuck device 48 for gripping the open end of the heat exchanger tube. Is provided.

As shown in FIG. 6, both ends of the guide shafts 47 and 47 (FIG. 1) are inserted through the chuck device 48, and the mandrel shaft 43 is inserted through the chuck shaft 48. The back end is fixed to the plate 51 fixed to the chuck plate 49, and the front end protrudes from the plate 55 through the plate 53, 55. The rear end portion is fixed to the cylindrical clamp chuck 50 and the plate plate 53, and the front end portion protrudes from the plate plate 55 through the plate plate 55, and the clamp chuck 5. And a clamping sleeve 52 which is slidably provided in sliding contact with the outer peripheral surface of the cylinder.

An expansion billet 54 attached to the tip of the mandrel 43 can be inserted into the clamp chuck 50 constituting the gripping tool along the central axis.

The chuck device 48 includes a hydraulic cylinder 56 for moving the chuck plate 49 forward and backward to move the clamping chuck 50 and the tightening sleeve 52 on a base (not shown). In addition, a hydraulic cylinder 57 that moves the plate plates 53, 55 forward and backward with respect to the plate plate 51 and advances and retracts only the tightening sleeve 52 is provided with a chuck plate 4. 9 is provided.

The clamp chuck 50 shown in Fig. 6 is a tubular member into which the open end of the heat exchanger tube can be inserted as shown in Fig. 7A and Fig. 7B. A slit (not shown) is provided to reduce the diameter. Heel The clamp chuck 50 has projections 58, 58... That protrude outwardly intermittently on the outer peripheral surface and have a flat top surface. This protrusion

5 8, 5 8 ■ · Sliding contact with each flat top surface of, the tightening sleeve moves forward and backward, and clamp clamp chuck 50 is tightened.

Further, a protrusion 59 is formed on the inner peripheral surface of the tip of the clamp chuck 50 so as to protrude inward from the clamp chuck 50 and is inserted into the clamp chuck 50. The open end of the heat exchanger tube can be gripped.

The inner diameter of the clamp chuck 50 is such that the expanded billet 54 attached to the tip of the mandrel 43 while being tightened by the tightening sleeve 50 can move forward and backward by itself. It is preferable that

As described above, the position adjusting side device 40b constituting the primary expansion device 40 in combination with the reference side device 40a described above is provided by the hydraulic cylinder 60 as shown in FIG. The reciprocating body 62 on which one end of the mandrel 43 is mounted moves forward and backward to expand the heat exchanger tube.

In the position adjusting device 40b, the mounting table 63 on which the hydraulic cylinder 6 シリ and the reciprocating body 62 are mounted is a movable table. That is, the mounting table 63 is provided so as to be movable in the left-right direction along the rails 64 provided on the base 61, and at one end is driven by a servo motor 41 (FIG. 1). Pulley for transmitting force

65 is connected to the fixed ball screw 66, and can be moved to the left and right by the drive of the servomotor 41 to adjust the position to a predetermined position. The first servomotor 41 is used to move the mounting table 63 to a predetermined position so as to conform to the length of the tube group A when performing the primary expansion on the tube group A having different lengths. Driven by Further, as described later, when the contraction force of the heat exchanger tube becomes larger than the chucking force of the chuck device 48 during the first expansion, the contraction of the heat exchanger tube is reduced. The servomotor 41 is also driven to move the mounting base 63 so that the heat exchanger tubes are not detached from the chuck device 48 by allowing the parts.

Also in the position adjusting device 40b, the clamp device or the like that grips the open end of the heat exchanger tube is the same as the clamp device used in the reference device 40a. The same ones as in Fig. 48 are used.

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

As shown in FIG. 9, the position adjusting side device 80b of the second and third tubing expansion devices 80 shown in FIG. 1 is moved along rails 83 provided on the base 82. 4 is provided movably. The movable base 84 is connected to a ball screw 86 to which a pulley 85 for transmitting the driving force of the servomotor 81 (FIG. 1) is fixed at one end. It can be moved to the left and right to adjust the position to a predetermined position. The servo motor 81 is used to move the movable base 84 to a predetermined position so as to conform to the length of the tube group A when performing the second and third expansion to the tube group A having different lengths. And so on.

On the movable table 84, there are provided second and tertiary expansion sections 87 which form an insertion port with a flare at the open end of the heat exchanger tube. The second and tertiary tube expansion sections 87 are movably provided by rails 88 provided on the moving table 84, and the driving force of the hydraulic cylinder 89 fixed to the moving table 84 is provided. By rail

8 Move along 8.

As described above, the cylinders 90a and 90b are provided near the distal end surfaces of the second and tertiary tube expansion sections 87 movably provided along the rails 88, respectively. The tube group A which has been moved by the endless belt V by the dams 90a and 90b 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 tube expansion sections 87 is movably provided on the rail 88, and the oil fixed to the moving base 84 is provided. It moves to the left and right by the pressure cylinder 89. An oil pressure cylinder 92 is provided inside the frame 87. This hydraulic cylinder 92 is a flare punch.

The plate plate 93 for fixing the rear end of the plate 94 is moved in the left-right direction.

Hydraulic cylinders 95a and 95b provided on the frame 91 are used to flex the mold members 96a and 96b forming a die into which the tip of the flare bond 94 is inserted. It is provided so as to be movable in a direction perpendicular to the moving direction of the punch 94. Therefore, according to the second and third expansion sections 87 shown in FIG. 10, the hydraulic cylinder 89 is driven to adjust the positions of the flare punch 94 and the mold members 96a and 96b. After that, the hydraulic cylinders 95a and 95b are driven to drive the hydraulic cylinder 92 into the die formed by the mold members 96a and 96b, thereby forming the free punch 94. The leading end can be entered.

FIG. 10 shows a state in which the rod 92 a is most protruded so that the hydraulic cylinder 92 and the plate plate 93 are in contact with the frame body 91.

As shown in FIG. 11, the flare bond 94 shown in FIG. 10 has one end of a connecting pipe 208 (FIG. 12) connected to the open end of the heat exchanger tube. An inlet forming portion 94a for forming an insertion port to be inserted and a flare forming portion 94b for forming a flare at an opening end of the insertion port are formed. The outer diameter of the insertion port forming portion 94a is generally larger than the maximum diameter of the expansion tube 54 used in the primary expansion device 40.

The reference side device 80a of the second and third tube expansion devices 80 is the same as the position adjustment side device 80b except that the movable base 84 of the position adjustment side device 80b is a fixed base. Since this is a configuration, detailed description is omitted.

When expanding the tubes for the heat exchanger using the expanding device shown in Fig. 1 to Fig. 11 described above, first, the reference side device should be set to the length of the tube group A to be expanded. Servo motors 11, 10 a, 40 a, 80 a, and the position adjustment side devices 10 b, 40 b, 80 b are adjusted to fit the length of the tube group A. Drive 4 1 and 8 1 to adjust.

As shown in FIG. 1, the tube group A has a size that forms one surface side of a laminated body formed by laminating a plurality of fine fins 102, 102 having a through hole. The end of the heat exchanger tube 100 is inserted through each through-hole of the fins 102, 102,... So that the tip protrudes from the plate 104. .

Next, the tube group A is placed between the reference-side device 10a and the position-adjustment-side device 10b of the temporary expansion device 10 to perform temporary expansion. The operation of the position adjusting device 10b in this temporary expansion will be described. In the temporary expansion jig section positioned at a predetermined position by the servo motor 11, the hydraulic cylinder 21 is driven to move the frame 23, and the temporary expansion punch 28 is moved as shown in FIG. 4A. Into the open end of the corresponding heat exchanger tube 100 of the tube group A.

In FIG. 4A, the temporary expansion pin 26 is retracted by the hydraulic cylinder 24, and the tapered pin 25 is also a ring-shaped elastic member 34 with the entire temporary expansion punch 28. And 34 are retracted by the tightening force of FIG. For this reason, the intermediate portion 33 can be inserted into the open end of the heat exchanger tube 100 even at the front end 32 of the temporary expansion pin 26 whose outer diameter is larger than the front end side and the rear end side.

At this time, the heat exchanger tube 100 is not integrated with the fins 102, 102 because of unexpanded tube. The open end of the heat exchanger tube 100 is pressed against the end face 29 of the temporary expansion punch 28 from which the distal end 32 protrudes, whereby the side plate 104 of the heat exchanger tube 100 is pressed. The protrusion length protruding from can be easily adjusted. For this reason, the projecting length of the plurality of heat exchanger tubes 100 forming the tube group A projecting from the side plates 104 can be made uniform.

Further, the hydraulic cylinder 24 is driven to advance the temporary expansion pin 26, and as shown in FIG. 4B, the pin '25 is applied to the tightening force of the ring-shaped elastic members 34, 34. By piled up and inserted into the tapered inner hole 36 of the temporary expansion punch 28, the entire outer diameter of the temporary expansion punch 28 including the distal end 32 can be expanded. For this reason, a temporary expanded portion 106 that follows the outer shape of the distal end portion 32 of the temporary expanded punch 28 can be formed at the open end of the heat exchanger tube 100. The temporary expanded portion 106 has a maximum diameter larger than the opening diameter of the open end near the open end of the heat exchanger tube 100 and at a predetermined position from the open end. However, as shown in FIG. 7B, the maximum diameter is larger than the inner diameter of the heat exchanger tube expanded in the first expansion. However, the temporary expansion section 106 is subjected to second and third expansion by a flare punch 94 shown in FIG.

After the provisional expansion is completed, the hydraulic cylinder 24 is driven to retract the pin 25, and the tip portion 32 is included by the tightening force of the ring-shaped elastic members 34, 34. The distal end 32 of the temporary expansion punch 28 can be extracted from the open end of the heat exchanger tube 100 by reducing the overall outer diameter of the temporary expansion punch 28.

Here, assuming that the shape of the temporary expansion section 106 is the same diameter from the opening end of the heat exchanger tube 100 to a predetermined position, the opening of the heat exchanger tube 100 where a rapid expansion force acts. Cracks may occur at the edges.

The tube group A in which the open ends of each heat exchanger tube 100 are temporarily expanded is sent to the primary expansion device 40 by the endless belt V shown in Fig. 1 and the primary expansion is performed. Then, the fin 102 and the heat exchanger tube 100 are integrated.

In the expansion device shown in FIG. 1, the primary expansion device holds the open end of the heat exchanger tube 100 by the chuck device 48 as shown in FIGS. 7A and 7B. It is given. In the chuck device 48, a hydraulic cylinder 56 (FIG. 6) is driven, and as shown in FIG. 7A, a heat exchanger tube 100 is placed in a clamp chuck 50. The clamp chuck 50 and the clamp sleeve 52 are advanced to a position where the open end including the temporary expanded tube 106 is inserted.

Further, by driving the hydraulic cylinder 57, the plate plates 53, 55 are advanced with respect to the plate plate 51, and only the tightening sleeve 52 is advanced, as shown in FIG. 7B. Then, the clamp sleeve 52 is advanced onto the protrusion 58 formed on the outer peripheral surface of the tip of the clamp chuck 5 ◦, and the clamp chuck 50 is tightened to form the heat exchanger tube 100. Of the open end of the. At the time of such gripping, 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 peripheral surface of the tip of the clamp chuck 50. The temporary expanded section 106 formed in the section can be easily and reliably gripped.

Then, the reciprocating body 44 of the reference side device 40a of the primary pipe expander 40 or the reciprocating body 62 of the position adjusting side device 40b is driven by the servomotor 42 or the hydraulic cylinder 60. The tube is advanced, and the tube expansion bill 54 attached to the tip of the mandrel 43 is inserted into the heat exchanger tube 100 to perform the first tube expansion. At the time of such primary expansion, the open end of the heat exchanger tube 100 is gripped by the clamp chuck 50 and the clamp sleeve 52. The contraction of the exchanger tube 100 can be prevented as much as possible. Further, since the temporary expanded portion 106 is formed at a predetermined position at the opening end of the heat exchanger tube 100, the gripped portion of the heat exchanger tube 100 is always fixed. In addition to being able to prevent the heat exchanger tube 100 from contracting due to expansion as much as possible, the heat exchanger tube protruding from the side plate 104 after the first expansion. The protrusion length of 100 can be made as constant as possible.

In the primary expansion device 40 of the expansion device shown in Fig. 1, it is too long to perform the primary expansion from only one of the open ends of the heat exchanger tubes 100, so the reference side device 40a By alternately performing the primary expansion with the position adjusting device 40b, the primary expansion can be performed over the entire length even with the long heat exchanger tube 1 • 0. In this primary expansion, the primary expansion was first performed by the position adjusting device 40b, and then the primary expansion was performed by the reference device 40a.

In such a primary expansion, in each of the primary expansions of the position adjustment side device 40b and the reference side device 40a, each of both open ends of the heat exchanger tube 100 is provided with a clamp chuck 5. 0 and the clamp sleeve 52 can be substantially prevented from contracting due to the expansion of the heat exchanger tube 100.

In addition, the expansion length of the primary expansion performed by the reference device 40a is longer than the expansion length of the primary expansion performed by the position adjustment device 40b. For this reason, at the time of the first expansion by the reference side device 40a, the contraction force of the heat exchanger tube 100 becomes larger than the gripping force by the clamp chuck 50 and the clamp sleeve 52. However, the heat exchanger tube 100 may not be able to be gripped. In this case, the mounting platform 6 3 of the position adjusting device 40 b should be adjusted so that the contraction force of the heat exchanger tube 100 is less than the gripping force of the clamp chuck 50 and the crumb sleeve 52. The position may be adjusted by driving the servo motor 41.

The tube group A in which the heat exchanger tubes 100 are integrated with the heat exchanger tubes 100 by applying the primary expansion to the heat exchanger tubes 100 is the endless bell shown in Fig. 1. The tube V is sent to the second and third expansion devices 8.0 to form a flared insertion port at the open end of the heat exchanger tube 100. In the second and third tube expansion devices 80, first, the hydraulic cylinder 89 is driven, and heat is applied between the mold members 96 a and 96 b provided in the second and third tube expansion portions 87. The second and third expansion sections 87 are moved to positions where the open ends of the exchanger tubes 100 are sandwiched.

Further, in the second and third expanded portions 87 moved to the predetermined positions, the hydraulic cylinders 95a and 95b are driven to form a die by the mold members 96a and 96b. The open end of the heat exchanger tube 100 is sandwiched between the dies. Since the temporary expanded portion 106 is formed at the open end of the heat exchanger tube 100, the open end of the heat exchanger tube 100 has mold members 96a and 96b. In the state formed by the die.

Next, the hydraulic cylinder 92 is driven to insert the distal end of the flare bonder 94 into the open end of the heat exchanger tube 100 whose open end is gripped as shown in FIG. To form a flared insert 108.

At the end of the flare punch 94, as described above, an insertion opening for forming an insertion opening for inserting one end of the connecting pipe 208 (FIG. 12) into the opening end of the heat exchanger tube. A forming portion 94a and a flare forming portion 94b for forming a flare at the opening end of the insertion port are formed. For this reason, by inserting the end of the flare punch 94 into the open end of the heat exchanger tube 100, first, the heat exchanger tube 100 is formed by the insertion port forming portion 94a of the flare punch 94. A second expansion to form an insertion port is performed at the opening end of the opening, and a third expansion to form a flare by the flare forming part 94b at the opening end of the insertion port formed by the second expansion is continued. Will be applied.

In the second and third expansions, as described above, since the temporary expansion portion 106 is formed at the open end of the heat exchanger tube 100, the thrust of the flare punch 94 is exchanged by heat. The flare insertion portion 108 can be formed without adding to the vessel tube 100 °, and the flare can be formed as compared with the case where the second and third expansions are performed without forming the temporary expansion portion 106. It is possible to prevent the occurrence of cracks in the insertion slot as much as possible.

The expansion apparatus shown in Figs. 1 to 11 described above is a horizontal expansion apparatus. However, it goes without saying that the present invention can be applied to a vertical tube expanding apparatus.

Further, a tube group A composed of straight tubular heat exchanger tubes having open ends protruding from each of both end surfaces of the laminate, and instead, a U-shaped portion protrudes from one end surface of the laminate and the laminate is formed. According to the present invention, it is also possible to perform tube expansion according to the present invention on a tube group including a U-shaped heat exchanger tube having an open end projecting from the other surface side. When a tube group composed of such U-shaped heat exchanger tubes is expanded using the expansion device shown in FIG. 1, a U-shape of the heat exchanger tubes protruding from one surface side of the laminate is used in the reference side device. The rod is passed through the next part, and in the position adjustment side device, the temporary expansion tube, the first expansion tube, and the second and third expansion tubes are opened at the open ends of the heat exchanger tubes protruding from the other side of the laminate. Expand the pipe. In this way, when a U-shaped heat exchanger tube is used, the open end of the heat exchanger tube is gripped and the first expansion is performed, eliminating the need for a receiver that receives the U-shaped portion. can do.

In addition, in the expansion equipment shown in Fig. 1 to Fig. 11, the temporary expansion, the primary expansion, and the second and third expansions are performed continuously, but the temporary expansion, the primary expansion, and the 2,

Each device of the tertiary expansion may be separately installed in different places, and each expansion may be performed. In this case, the temporary expansion and the primary expansion are successively performed to integrate the heat exchanger tube and the fins to improve the handling, and then the second and third expansion devices are installed. It is preferable to apply second and third expansion to the heat exchanger tube at the place. Industrial applicability

According to the present invention, before performing the first expansion, a temporary expansion is performed near the opening end of the heat exchanger tube and at a predetermined position from the opening end to a diameter larger than the opening diameter of the opening end. Therefore, even if the opening end of the tube for the heat exchanger is greatly expanded, as in the case of forming an insertion port with a flare at the opening end of the tube for the heat exchanger, it is likely to occur at the expanded end of the tube. Cracks can be prevented. For this reason, when forming an insertion hole with a flare at the open end of the tube for heat exchanger, a uniform insertion hole with a flare can be formed, and the defect rate due to crack generation at the entrance with the flare can be reduced. Can be reduced. In addition, when performing tube expansion by holding the outer peripheral side of the open end of the heat exchanger tube at the time of the first expansion, the presence of the temporary expanded portion at a predetermined position from the open end of the heat exchanger tube causes the heat expansion. The open end of the heat exchanger tube can be easily and securely gripped at a predetermined position to expand the heat exchanger tube over the entire length of the heat exchanger tube. For this reason, each of the heat exchanger tubes for which the primary expansion has been completed can have its opening end positions aligned with predetermined positions. By forming an insertion port with a flare at the opening end of such a tube for a heat exchanger, the opening end of the insertion port with a flare can also be aligned at a predetermined position, and a connecting pipe for interconnecting the tubes for a heat exchanger. Can be automatically mounted.

In addition, when performing the first expansion and the second and third expansion to the heat exchanger tube by holding the opening, the fin integrated with the heat exchanger tube must have the heat exchanger tube. Substantially no thrust is applied in the direction of pipe expansion, and it is possible to simplify the clamp device and guard device for positioning the laminate.

Claims

The scope of the claims

1. When expanding the heat exchanger tube inserted through the through-hole such that the tip protrudes from one end surface side of a laminated body formed by stacking a plurality of fins having the through-hole. To

Temporarily expanding the distal end portion of the heat exchanger tube protruding from the laminated body, wherein a predetermined position from the opening end of the distal end portion after the temporary expansion is larger than the opening diameter of the opening end. After forming the part,

A method for expanding a tube for a heat exchanger, characterized in that a primary expansion is performed over the entire length of the tube for a heat exchanger so as to integrate the fin and the tube for a heat exchanger.

2. One end of a connecting pipe that interconnects the plurality of heat exchanger tubes inserted into the laminated body can be inserted into the open end of the heat exchanger tube on which the primary expansion has been performed. 2. The method for expanding a tube for a heat exchanger according to claim 1, wherein the second and third expansions forming the insertion opening with the rare are performed.

3. In order to substantially prevent the heat exchanger tubes from shrinking due to the expansion at the time of the first expansion, the open ends of the heat exchanger tubes that are temporarily expanded and protrude from both end surfaces of the laminated body. The method for expanding a tube for a heat exchanger according to claim 1 or 2, wherein the expansion is performed by gripping an outer peripheral side of the portion.

4. The method for expanding a tube for a heat exchanger according to claim 3, wherein the outer peripheral side of the opening end of the tube for the heat exchanger where the temporary expansion is performed is gripped by a cylindrical gripping tool.

5. The expansion of the heat exchanger tube according to any one of claims 1 to 4, wherein the first expansion is performed by alternately inserting expansion tubes from both open ends of the heat exchanger tube protruding from both ends of the laminate. Method.

6. Heat for expanding the heat exchanger tube inserted through the through-hole so that the tip protrudes from one end surface side of the laminated body formed by laminating a plurality of fins having the through-hole. In a tube expansion device for exchanger tubes,

Temporary expansion is performed on the distal end of the heat exchanger tube protruding from one end surface side of the laminate, and a predetermined position from the open end of the distal end after the temporary expansion is larger than the opening diameter of the open end. A temporary expansion device for forming a temporary expansion portion having a diameter,

Expanding a heat exchanger tube characterized by comprising a primary expansion device that performs a primary expansion along the entire length of the heat exchanger tube and integrates the fin and the heat exchanger tube. apparatus.

7. A flare that allows insertion of one end of a connecting pipe that interconnects a plurality of heat exchanger tubes inserted into the laminate into the open end of the heat exchanger tubes that have undergone the primary expansion. 7. The tube expansion device for a heat exchanger tube according to claim 6, further comprising second and third tube expansion devices forming an insertion hole with a hole.

8. In the temporary expansion device, when the tip is inserted into the heat exchanger tube, the outer diameter of the portion located at a predetermined position from the open end of the heat exchanger tube is larger than the rear end. In addition, a temporary expanding punch provided with an outer diameter of the distal end portion capable of expanding and reducing the diameter, and a pin for expanding the outer diameter of the distal end portion when inserted into the temporary expanding Bonus are provided. The tube expansion device for a heat exchanger tube according to claim 6, further comprising: a provisional tube expansion pin provided; and a driving device that drives the pin of the temporary tube expansion pin to be inserted into and removed from the temporary tube expansion punch.

9. The outer peripheral side of each protruding portion of the heat exchanger tube projecting from both end surfaces of the laminate so that the primary tube expansion device can substantially prevent the heat exchanger tube from contracting due to the tube expansion. The tube expanding device for a heat exchanger tube according to claim 6, further comprising a gripping means for gripping the tube.

10. The holding means is inserted with the temporarily expanded open end of the heat exchanger tube. Along the outer circumferential surface of the clamp chuck so as to grip the cylindrical clamp chuck formed to be reduced in diameter and the open end of the heat exchanger tube inserted into the clamp chuck. The tube expansion device for a heat exchanger tube according to claim 9, further comprising a clamp sleeve provided so as to be capable of tightening the crumb chuck in the diameter reducing direction.

1 1. When the clamp chuck is tightened by the clamp sleeve, the clamp chuck is locked so that the temporarily expanded open end of the heat exchanger tube inserted into the clamp chuck is locked. 10. The apparatus for expanding a tube for a heat exchanger according to claim 9, wherein a protrusion is formed on an inner surface side of the distal end portion.

1 2. In the second and tertiary expansion devices, a front end is inserted into the open end of the heat exchanger tube, and a flared insertion port is formed at the open end so that one end of the connection pipe can be inserted. The tube expansion device for a heat exchanger tube according to claim 7, further comprising a flare punch.