JP2011005529A - Method and device for forming fin collar of heat exchanging fin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method and a device for forming a fin collar of a heat exchanging fin by which production lead time is made short, the scale of a die is miniaturized, the cost of the die is made low and the height of the fin collar is made uniform over the entire circumference.SOLUTION: A metal pool forming stage is a stage where a metal pool is formed with an upper die and a lower die on which a forging die is provided. A forging die is divided into a fixed forging part and a movable forging part and, by controlling pressing force against the plate fin base stock of the movable forging part, the metal pool is formed in a portion on the opposite side to the movable forging part of the fixed forging part.

Description

  The present invention relates to a method and an apparatus for forming a fin collar of a heat exchange fin that penetrates and closely contacts a heat transfer tube for circulating a refrigerant used in a heat exchanger.

  Techniques (methods and apparatuses) for forming a fin collar of a heat exchange fin have been conventionally used (for example, Patent Document 1, Patent Document 2, and Patent Document 3). Hereinafter, the prior art will be described. In the former (Patent Document 1 and Patent Document 2), the conventional technique forms a projecting portion of a predetermined height on a plate fin material by a multi-stage drawing process (processing), and then projects the plate fin material by a piercing process (processing). At the same time, the overhanging part with the plate fin material hole is raised in the burring process (machining) to form the rising part, and the tip of the rising part of the plate fin member in the curling process (machining) A curled portion is formed by curling a portion. In the former (Patent Document 1, Patent Document 2), the coining process (machining) forms a depression in the plate fin material and an annular meat reservoir around the depression, and the piercing process (machining). A hole is made in the depression of the plate fin material with the burring process (machining) and the ironing part (plate) around the hole in the plate fin material is raised in the burring process (machining) to form the rising part, and the curling process (machining) The curled portion is formed by curling the tip of the rising portion of the plate fin member.

Japanese Patent Laid-Open No. 60-238051 JP 59-16639 A JP-A-62-124040

  However, the former prior art requires a multi-stage drawing process, so that the production lead time is long, and the die size of the drawing process is increased, and the mold cost is high. . Further, since the latter conventional technique requires an ironing process, the thickness of the fin collar is not rolled uniformly around the circumference when the center axis of the die hole of the die and the molding punch in the ironing process is shifted. As a result, there is a problem that the height of the fin collar is not uniform over the entire circumference. If the height of the fin collar is not uniform over the entire circumference, a large number of plate fins cannot be stacked at the same interval, causing a problem that the performance of the heat exchanger varies.

  The present invention has been made in view of the above. The production lead type is short, the size of the mold can be reduced, the mold cost can be reduced, and the height of the fin collar can be reduced. It is an object of the present invention to obtain a fin collar molding method and apparatus for heat exchange fins that can be made uniform over the entire circumference.

  In order to solve the above-described problems and achieve the object, the present invention provides a plate fin material in a method of forming a fin collar of a heat exchange fin that is in close contact with a heat transfer tube for circulating a refrigerant used in a heat exchanger. Forming a reservoir portion at a location corresponding to the fin collar, stretching the reservoir portion of the plate fin material to form an overhang portion, and opening a hole in the overhang portion of the plate fin material. A step, a step of forming the protruding portion by raising the overhanging portion having the hole of the plate fin material, and a step of forming a curled portion by curling the tip of the rising portion of the plate fin member The meat reservoir portion forming step is a step of forming the meat reservoir portion with an upper die and a lower die provided with forging dies. The forging die is divided into a forging fixed portion and a forging movable portion, and the pressing force of the forging movable portion against the plate fin material is controlled, so that a portion of the forging fixed portion on the opposite side to the forging movable portion is controlled. The meat reservoir is formed.

  In the present invention, the first stage of the multi-stage drawing process is a forging process, and the forging die of the upper die of the forging process is divided into a forging fixed part and a forging movable part, and the forging fixing part The forging movable part of the forging fixed part is controlled by controlling the pressing force against the plate fin material to the forging movable part so that the surplus generated by the depression does not move to the forging movable part. A meat reservoir is formed on the opposite side. As a result, the present invention can form a meat pool portion at a position corresponding to the fin collar of the plate fin material in the forging process, so that even if the plate fin material is greatly squeezed and extended in the next drawing process, The reservoir is stretched. Therefore, according to the present invention, a predetermined (final) overhang portion can be formed in the plate fin material without any cracks or breakage in a single drawing step. As a result, according to the present invention, the production lead type is short, the size of the mold can be reduced, the mold cost can be reduced, and the height of the fin collar can be made uniform over the entire circumference. There is an effect.

FIG. 1 is a diagram showing an overall mold configuration related to fin color molding processing of heat exchanger fins according to the present invention. FIG. 2 is a cross-sectional view of the main part showing the state of the plate fin material just before starting forging, which is the first step (first stage). FIG. 3 is a cross-sectional view of a principal part showing a state in the middle of forming the plate fin material when forged. FIG. 4 is a cross-sectional view of the main part showing a state after the forging process is completed. FIG. 5 is a cross-sectional view of a main part showing a drawing standby state after the forged plate fin material is sent to the drawing process. FIG. 6 is a cross-sectional view of a main part showing a processing state during drawing. FIG. 7 is a cross-sectional view of the main part showing a state in which the drawing process has been completed. FIG. 8 is a cross-sectional view of the main part showing a state before processing before performing drilling (piercing) and burring simultaneously. FIG. 9 is a cross-sectional view of a main part showing a state in which drilling and burring are performed simultaneously. FIG. 10 is a cross-sectional view of the main part showing a state where the burring process is completed. FIG. 11 is a cross-sectional view of the main part showing a state where the fin collar has been curled. FIG. 12 is a cross-sectional view showing an assembled state of the fin collar and the heat transfer tube. FIG. 13 is a diagram showing a second embodiment in which a tapered portion is provided in a fixed portion for forging. FIG. 14 is a diagram showing a third embodiment in which the control means for the movable part of the forging process is hydraulically controlled. FIG. 15 is a cross-sectional view of a main part showing a fourth embodiment in which a movable part for forging is divided into two parts. FIG. 16 is a configuration diagram showing a fifth embodiment in which the forging fixed portion is elastically supported.

  DESCRIPTION OF EMBODIMENTS Embodiments of a fin color molding method and apparatus for heat exchange fins according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIGS. 1-12 shows Embodiment 1 of the fin color shaping | molding method and apparatus of a heat exchanger fin concerning this invention. In addition, since drawing is a conceptual diagram, the dimension of each component shown in each figure may not correspond.

  Hereinafter, the structure of the fin color shaping | molding method and apparatus of the heat exchanger fin concerning Embodiment 1 is demonstrated. In the figure, reference numeral 1 denotes a fin color forming apparatus for heat exchange fins according to the first embodiment. The fin collar molding apparatus 1 includes an upper die (die die) 2, a lower die 3, a guide post 4, a press machine (not shown), and a feed mechanism (not shown). is there.

  The upper die 2 is composed of a forging die 6, a drawing die 7, and a piercing burring die 8. That is, the upper die 2 is provided with the forging die 6, the drawing die 7, and the piercing burring die 8, respectively. The upper die 2 is guided by the guide post 4 so as to be movable with respect to the lower die 3 in the axial direction of the guide post 4 (the direction of arrow A and the direction opposite to the arrow A).

  The press machine is, for example, a mechanical press machine or a hydraulic press machine, and moves the upper mold 2 in the direction of arrow A along the guide post 4. The feeding mechanism feeds the plate fin material 5 for each step in the order of forging, drawing, piercing (piercing), and burring.

  A contact surface 9 is provided on the surface of the lower mold 3 facing the upper mold 2. A stripper plate 10 is disposed on the abutment surface 9 side of the lower mold 3. A plurality of guide pins 11 are fixed to the stripper plate 10. On the other hand, the lower mold 3 is provided with a plurality of guide holes 12. The guide pin 11 is fitted in the guide hole 12. A spring (stripper plate spring) 13 is disposed between the lower mold 3 and the stopper plate 10 and outside the guide pin 11. As a result, the stripper plate 10 is guided by the guide pin 11 and the guide hole 12 so as to be movable in the direction of arrow A and in the direction opposite to the arrow A with respect to the lower mold 3, and the spring 13 Therefore, it is always urged in the direction of arrow B (the direction opposite to arrow A). In addition, the recessed part is provided in the location where the said spring 13 is located among the said contact surfaces 9 of the said lower mold | type 3. As shown in FIG.

  A molding drawing punch 14 is fixed to a portion of the lower mold 3 corresponding to the drawing die 7. Further, a burring mold 15 is fixed to a portion of the lower mold 3 corresponding to the pierce burring die 8. On the other hand, in the stripper plate 10, a portion corresponding to the drawing die 7 and the forming drawing punch 14 is provided with a through hole 16 in which the forming drawing punch 14 protrudes and retracts. Further, a through hole 17 in which the burring mold 15 is projected and retracted is provided at a position corresponding to the piercing burring die 8 and the burring mold 15 in the stripper plate 10.

  The forging die 6 includes a forging fixing portion 18 and a forging movable portion 19 including a spring (forging movable portion spring, die spring) 20 as a pressing force control means. The forged fixing portion 18 is integrally provided as an annular (annular) convex portion on the surface of the upper die 2 facing the lower die 3. At the tip of the forged fixing portion 18 and facing the lower mold 3, that is, the inner peripheral corner of the contact portion (or the inner peripheral corner and the outer peripheral corner), A curved portion (R processed portion) 21 is provided.

  The forging movable part 19 is configured separately from the forging fixing part 18, that is, the upper mold 2. The forged movable part 19 has an annular shape (annular shape), and is arranged outside the forged fixed part 18 so as to be movable in the direction of arrow A and in the direction opposite to the arrow A with respect to the forged fixed part 18. . That is, the inner peripheral surface of the forged movable portion 19 is fitted to the outer peripheral surface of the forged fixed portion 18 so as to be slidable in the central axis direction of the forged fixed portion 18 and the forged movable portion 19.

  A plurality of guide pins 22 are fixed to the forged movable portion 19 at equal intervals. On the other hand, the upper mold 2 is provided with a plurality of guide holes 23 at equal intervals. The guide pin 22 is fitted in the guide hole 23. The spring 20 is disposed between the upper die 2 and the forging operation portion 19 and outside the guide pin 22. As a result, the forging movable portion 19 is guided by the guide pin 22 and the guide hole 23 so as to be movable in the direction of arrow A and in the direction opposite to the arrow A with respect to the upper die 2, and the spring 20 is always urged in the direction of arrow A. The spring 20 is a means for controlling the force with which the forging movable part 18 presses against the plate fin material 5.

  The forging die 6 of the upper die 2 is divided into the forging fixed part 18 and the forging movable part 19. On the other hand, the lower mold 3 is composed of a single mold. The forging fixed portion 18 and the forging movable portion 19 of the two-part mold of the forging die 6 of the upper die 2 and the lower die 3 of one die are fin collars of the plate fin material 5. The means for forming the meat reservoir 25 at a location corresponding to 24 is configured.

  The drawing die 7 of the upper mold 2 is provided with a trapezoidal (conical trapezoidal) recess 26 on the surface of the upper mold 2 facing the lower mold 3. On the other hand, the molding drawing punch 14 of the lower die 3 has a columnar shape (cylindrical shape), and a tip portion (a portion facing the concave portion 26 of the drawing die 7 of the upper die 2) is semicircular (hemispherical). It is what makes. The concave portion 26 of the drawing die 7 of the upper die 2 and the molding drawing punch 14 of the lower die 3 are means for extending the meat reservoir portion 25 of the plate fin material 5 and forming an overhang portion 27. It constitutes.

  The piercing burring die 8 of the upper mold 2 includes a punching punch 28 and a knockout collar 29. A concave portion (circular concave portion) 26 is provided on a surface of the upper die 2 facing the lower die 3 of the pierce burring die 8. The punching punch 28 is fixed to the center of the recess 26. A tip end portion of the punching punch 28 (a portion facing the lower die 3) protrudes toward the lower die 3. The outer peripheral surface of the knockout collar 29 is fitted and fixed to the inner peripheral surface of the recess 26. The outer peripheral surface of the punching punch 28 and the inner peripheral surface of the knockout collar 29 are concentric.

  On the other hand, the burring mold 15 of the lower mold 3 has a cylindrical shape (cylindrical shape). The inner diameter of the burring mold 15 is substantially equal to or slightly larger than the outer diameter of the punching punch 28. The outer diameter of the burring mold 15 is smaller than the inner diameter of the knockout collar 29 by the thickness of the fin collar 24. The punching punch 28 and the knockout collar 29 of the pierce burring die 8 of the upper mold 2 and the burring molding mold 15 of the lower mold 3 are formed in a hole 30 in the overhanging portion 27 of the plate fin material 5. And a means for raising the overhanging portion 30 having the hole 30 of the plate fin material 5 and molding the rising portion, that is, the fin collar 24.

  The fin color molding method and apparatus for heat exchanger fins according to the first embodiment is configured as described above, and the operation thereof will be described below.

  First, in FIG. 2, the upper mold | type 2 is moved to the arrow A direction with a press. Then, the pressing surface of the forging fixing portion 18 of the forging die 6 of the upper die 2 comes into contact with the plate fin material 5 mounted on the stripper plate 10 on the lower die 3 side. At the same time, the pressing surface of the forging movable portion 19 urged in the direction of arrow A by the spring 20 also contacts the plate fin material 5.

  Next, in FIG. 3, the upper mold | type 2 is further moved to the arrow A direction with a press. Then, the contact portion at the tip of the forging fixing portion 18 crushes the plate fin material 5. At this time, the forging movable part 19 movable along the forging fixing part 18 presses the plate fin material 5 against the strip rate 10 side. When the upper die 2 moves in the direction of the arrow A, a depression 31 is formed in the plate fin material 5 by the contact portion at the tip of the forging fixing portion 18. The surplus generated by the depression 31 starts to move in the direction of arrow C. At this time, the forging movable portion 19 applies a pressing force to the plate fin material 5 so that the surplus generated by the depression 31 does not move in the direction opposite to the arrow C, that is, the forging movable portion 19 side. This pressing force is determined by the spring force of the spring 20 that biases the forging movable part 19.

  Subsequently, in FIG. 4, the upper die 2 is further moved in the direction of arrow A by the press machine. Then, the forging fixing part 18 performs forging to the forging final position at a predetermined position. As a result, the surplus generated when the forging fixing portion 18 is pressed moves only in the direction of arrow C, that is, on the side opposite to the forging movable portion 19 side and on the inner peripheral surface side of the forging fixing portion 18. Then, the meat reservoir 25 is formed at a location corresponding to the fin collar 24 in the plate fin material 5. Thereby, a forging process (forging process) is completed. Note that the blank pressing force of the outer forging movable portion 19 is larger than the blank pressing force of the inner forging fixing portion 18.

  Next, in FIG. 5, the plate fin material 5 forged in the forging process is moved on the stripper plate 10 from the forging process to the next drawing process by the feed mechanism, and drawing is started. That is, the upper die 2 is moved in the arrow A direction by a press machine.

  Then, in FIG. 6, the meat pool portion 25 of the plate fin material 5 is located at a location where the inner surface of the concave portion 26 of the drawing die 7 and the outer surface of the forming drawing punch 14 are in contact. In this state, the upper die 2 is further moved in the direction of arrow A by a press. Then, the forming squeeze punch 14 squeezes the meat reservoir 25 of the plate fin material 5 and the meat reservoir 25 is stretched. Even if the plate fin material 5 is squeezed to a predetermined position by a single drawing process, the contact portion of the plate fin material 5 with the forming drawing punch 14 becomes thin and breaks or breaks. There is nothing.

  Furthermore, in FIG. 7, the upper mold | type 2 is further moved to the arrow A direction with a press. Then, the drawing die 7 moves in the direction of arrow A, and when the stripper plate 10 pushed by the drawing die 7 comes into contact with the contact surface 9 of the lower mold 3, the platen portion 25 of the plate fin material 5 is moved. The drawing step (drawing) for forming the overhanging portion 27 by stretching is completed.

  Next, in FIG. 8, the plate fin material 5 drawn in the drawing process is moved on the stripper plate 10 from the drawing process to the next piercing burring process by the feeding mechanism to start the piercing burring process. That is, the upper die 2 is moved in the arrow A direction by a press machine.

  Then, in FIG. 9, the punching punch 28 and the knockout collar 29 of the piercing burring die 8 move in the arrow A direction. The punching punch 28 enters the burring mold 15 and opens a hole 30 in the overhanging portion 27 of the plate fin material 5. The scrap of the protruding portion 27 of the plate fin material 5 having the holes 30 is discharged through the burring mold 15 to the outside. At the same time, the projecting portion 27 of the plate fin material 5 is sandwiched between the knockout collar 29 and the upper end portion of the burring molding die 15 of the lower die 3. Thereby, the protruding portion 27 having the holes 30 of the plate fin material 5 is raised to form the raised portion, that is, the fin collar 24. Thereby, a drilling process (drilling process) and a burring process (burring process) are completed simultaneously. As a result, the fin collar 24 is formed on the plate fin material 5 as shown in FIG.

  Then, in FIG. 11, a curled portion 32 is provided at the tip of the fin collar 24 of the plate fin material 5 by a curling process (curling process). Thereby, the plate fin 33 having the fin collar 24 is formed. Then, in FIG. 12, a large number of plate fins 33 are stacked, and the heat transfer tubes 34 are penetrated and adhered into the fin collars 24 of the large number of plate fins 33. Thereby, the heat exchanger 35 is manufactured.

  The fin color molding method and apparatus for heat exchanger fins according to the first embodiment are configured and operated as described above, and the effects thereof will be described below.

  In the fin color forming method and apparatus for heat exchanger fins according to the first embodiment, the forging die 6 of the upper die 2 of the die in the forging process is set as the forging process in the first stage of the multi-stage drawing process. Is divided into a forging fixed portion 18 and a forging movable portion 19, and the forging fixed portion 18 is provided with a recess 31 in the plate fin material 5, and forging is performed so that the surplus generated by the recess 31 does not move to the forging movable portion 19. By controlling the pressing force of the movable part 19 against the plate fin material 5, the meat reservoir 25 is formed on the forged fixed part 18 on the opposite side of the forged movable part 19. Thereby, since the fin collar shaping | molding method and apparatus of the heat exchanger fin concerning Embodiment 1 can shape | mold the pool part 25 in the location corresponding to the fin collar 24 among the plate fin raw materials 5 at a forging process, Even if the plate fin material 5 is greatly squeezed and stretched in the next squeezing step, the meat reservoir 25 is stretched. For this reason, the fin color molding method and apparatus for heat exchanger fins according to the first embodiment is a predetermined drawing (final) overhang without any cracks or breaks in the plate fin material 5 in one drawing step. The part 27 can be molded. As a result, the fin color molding method and apparatus for heat exchanger fins according to the first embodiment has a short production lead type, can reduce the size of the mold, and can reduce the cost of the mold. There is an effect that the height of the fin collar can be made uniform over the entire circumference.

  In addition, in the fin collar forming method and apparatus for heat exchanger fins according to the first embodiment, the curved portion 21 is formed at the corner portion that forms the pool portion 25 of the forged fixed portion 18, that is, the corner portion opposite to the forged movable portion 19. Since it is provided, it becomes easy to move the surplus generated by the depression 31 of the plate fin material 5 to the side opposite to the forging movable part 19, and the place on the opposite side to the forging movable part 19 in the forging fixed part 18. That is, the meat reservoir 25 can be reliably formed at a position corresponding to the fin collar 24 in the plate fin material 5. In addition, by changing the size and shape of the bending portion 21, the amount of the meat reservoir portion 25 can be adjusted to be large or small.

  Furthermore, since the fin collar forming method and apparatus for heat exchange fins according to the first embodiment uses the spring 20 as the pressing force control means, the structure is simple and the apparatus cost is low.

  Furthermore, the fin color molding method and apparatus for heat exchanger fins according to the first embodiment includes means for opening a hole 30 in the overhanging portion 27 of the plate fin material 5 and an overhanging portion 30 having the hole 30 of the plate fin material 5. The means for raising and forming the raised portion, that is, the fin collar 24, from the punching punch 28 of the piercing burring die 8, the knockout collar 29, and the burring molding die 15 of the lower die 3, that is, the punching step It is comprised from one means which performs a part formation process simultaneously. For this reason, the structure is further simplified, and the apparatus cost is further reduced.

Embodiment 2. FIG.
FIG. 13 shows a second embodiment of a fin color molding method and apparatus for heat exchanger fins according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 12 denote the same components.

  In the fin color molding method and apparatus for heat exchanger fins according to the second embodiment, instead of the curved portion 21, the corner portion for forming the meat accumulation portion 25 of the forged fixed portion 18, that is, the corner portion opposite to the forged movable portion 19 is used. A tapered portion 36 is provided. The fin color molding method and apparatus for heat exchanger fins according to the second embodiment can achieve substantially the same operational effects as the fin collar molding method and apparatus for heat exchanger fins according to the first embodiment. In addition, by changing the inclination angle of the taper portion 36, the amount of the meat accumulation portion 25 can be adjusted to be large or small.

Embodiment 3 FIG.
FIG. 14 shows Embodiment 3 of the fin collar molding method and apparatus for heat exchanger fins according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 13 denote the same components.

  The fin collar molding method and apparatus for heat exchanger fins according to the third embodiment uses a hydraulic cylinder 37 instead of the spring 20 as a pressing force control means. The fin color molding method and apparatus for heat exchanger fins according to the third embodiment can achieve substantially the same operational effects as the fin collar molding method and apparatus for heat exchanger fins according to the first embodiment. In addition, by changing the hydraulic pressure of the hydraulic cylinder 37, the force pressed against the plate fin material 5 of the forged movable part 19 can be adjusted.

Embodiment 4 FIG.
FIG. 15 shows Embodiment 3 of a fin collar forming method and apparatus for heat exchanger fins according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 14 denote the same components.

  In the fin collar forming method and apparatus for heat exchange fins according to the fourth embodiment, the forging movable part 19 includes a plurality of springs 40 and 41 each serving as a pressing force control means. In this example, two forging movable parts 38 and 39 are provided. It is divided into two. The fin color molding method and apparatus for heat exchanger fins according to the fourth embodiment can achieve substantially the same operational effects as the fin collar molding method and apparatus for heat exchanger fins according to the first embodiment. Moreover, since the forging movable part 19 is divided into two forging movable parts 38 and 39, the pressing force of the plate fin material 5 can be halved with the same surface pressure. That is, when the surface pressure of the two forging movable parts 38 and 39 with respect to the plate fin material 5 is substantially the same as the surface pressure of the one forging movable part 19 with respect to the plate fin material 5, the two forging movable parts 38 and 39 are provided. The pressing force of the plate fin material 5 of the springs 40 and 41 on the side can be halved from the pressing force of the plate fin material 5 of the spring 20 on the one forging movable part 19 side.

Embodiment 5 FIG.
FIG. 16 shows Embodiment 3 of the fin collar molding method and apparatus for heat exchanger fins according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 15 denote the same components.

  In the fin collar forming method and apparatus for heat exchange fins according to the fifth embodiment, the forging die 6 is configured separately from the upper die 2, and the forging die 6 is formed via an elastic body, that is, a guide pin 42, a guide hole 43 and a spring 44. It is supported by the mold 2. The fin color molding method and apparatus for heat exchanger fins according to the fifth embodiment can achieve substantially the same operational effects as the fin collar molding method and apparatus for heat exchanger fins according to the first embodiment.

  As described above, the method and apparatus for forming a fin color of a heat exchanger fin according to the present invention forms a fin collar of a heat exchanger fin that is in close contact with a heat transfer tube for circulating a refrigerant used in a heat exchanger. Useful for.

DESCRIPTION OF SYMBOLS 1 Fin color molding apparatus 2 Upper mold | type 3 Lower mold | type 4 Guide post 5 Plate fin raw material 6 Forging die 7 Drawing die 8 Pierce burring die 9 Contact surface 10 Stripper plate 11 Guide pin 12 Guide hole 13 Spring 14 Molding drawing punch 15 Burring molding Metal mold 16 Through hole 17 Through hole 18 Forging fixed part 19 Forging movable part 20 Spring 21 Curved part 22 Guide pin 23 Guide hole 24 Fin collar 25 Meat reservoir part 26 Recessed part 27 Overhang part 28 Punching punch 29 Knockout collar 30 Hole 31 Recess 32 Curled portion 33 Plate fin 34 Heat transfer tube 35 Heat exchanger 36 Tapered portion 37 Hydraulic cylinder 38 Forged movable portion 39 Forged movable portion 40 Spring 41 Spring 42 Guide pin 43 Guide hole 44 Spring

Claims (9)

In a method of forming a fin collar of a heat exchange fin that penetrates and closely contacts a heat transfer tube that circulates a refrigerant used in a heat exchanger,
A step of forming a meat reservoir in a portion corresponding to the fin collar of the plate fin material;
Stretching the meat pool portion of the plate fin material to form an overhang portion;
Opening a hole in the overhang of the plate fin material;
A step of raising the overhanging portion having the hole of the plate fin material to form a rising portion;
Curling the tip of the raised portion of the plate fin member to form a curled portion;
Consists of
The meat reservoir forming step is a step of forming the meat reservoir with an upper die and a lower die provided with a forging die, and the forging die is divided into a forging fixed portion and a forging movable portion, By controlling the pressing force of the forging movable part against the plate fin material, the meat pool part is formed on a part of the forging fixed part opposite to the forging movable part,
A fin color molding method for heat exchange fins. In an apparatus for forming a fin collar of a heat exchange fin that is in close contact with a heat transfer tube for circulating a refrigerant used in a heat exchanger
Means for forming a meat reservoir in a portion corresponding to the fin collar of the plate fin material;
Means for extending the meat pool portion of the plate fin material to form an overhang portion;
Means for opening a hole in the overhang portion of the plate fin material;
Means for raising the overhanging portion having the hole of the plate fin material and forming the rising portion;
Means for curling a tip portion of the rising portion of the plate fin member to form a curled portion;
With
The meat pool portion forming means is composed of an upper die provided with a forging die, and a lower die,
The forging die includes: a forging fixing portion that molds the meat pool portion; a forging movable portion that is movable with respect to the forging fixing portion and includes a unit that controls a force pressing the plate fin material. It is configured,
A fin color molding apparatus for heat exchanger fins.   The fin color molding apparatus for heat exchanger fins according to claim 2, wherein a curved portion is provided at a corner portion of the forged fixing portion for molding the pool portion.   The fin color molding apparatus for heat exchanger fins according to claim 2, wherein a taper portion is provided at a corner portion of the forged fixing portion for molding the pool portion.   The fin color molding apparatus for heat exchanger fins according to claim 2, wherein the pressing force control means is a spring.   The fin color molding apparatus for heat exchanger fins according to claim 2, wherein the pressing force control means is a hydraulic cylinder.   The fin color forming apparatus for heat exchanger fins according to claim 2, wherein the forged movable part is divided into a plurality of forged movable parts each having the pressing force control means.   3. The fin color forming apparatus for heat exchanger fins according to claim 2, wherein the forging die is configured separately from the upper die and is supported by the upper die via an elastic body.   The perforating means and the rising portion forming means are a process of forming a hole in the protruding portion of the plate fin material, and the rising portion having the hole of the plate fin material is raised to form the rising portion. The fin color molding apparatus for heat exchanger fins according to claim 2, wherein the fin collar forming apparatus comprises one means for simultaneously performing processing.

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