JP5313109B2 - Fin collar mold equipment - Google Patents

Description

  The present invention relates to a fin collar mold apparatus for molding fins used in a fin tube type heat exchanger that performs heat exchange between two fluids such as refrigerant and air.

  As a conventional fin collar molding die device for molding fins for heat exchangers, there is one that curls by following the outer shape of the reflier punch from the inner surface of the fin collar (see, for example, Patent Document 1). ).

JP 2003-329385 A (page 5, FIG. 6)

  In the conventional fin collar molding die apparatus as described above, since the outer shape of the refractor punch is copied from the inner surface of the fin collar, the fin collar approaches the bottom dead center of the press and the curling process of the reflier punch is almost completed. When the deformation resistance of the material of the portion constituting the inevitably increases, there is a problem that it is separated from the outer periphery of the reflare punch and is not copied. As a result, it is difficult to change the shape of the fin collar to the desired shape, and there are parts where the fin collar is formed that does not reach the plastic region, so the reflier punch rises and the restraint from the inner surface is released. Then, since a spring back is generated, it is difficult to improve the shape accuracy.

  The present invention has been made to solve the above-described problems of the prior art, and it is easy to process a fin collar into a desired shape and can improve the shape accuracy. The purpose is to obtain a mold device.

A fin collar molding die apparatus according to the present invention is a cylindrical shape that is fixed to a slide of a press machine and is to form a fin collar provided on a fin that is a workpiece fixed to a fixing portion of the press machine. The reflare punch that constrains the inner peripheral surface of the part and the reflare punch that is divided so as to surround the reflare punch and can be advanced and retreated in the radial direction in which the presser part that presses the outer peripheral surface of the cylindrical part protrudes radially inward. A presser member having a plurality of pawls, and a presser member moving mechanism that moves the pawls of the presser member in the direction of the center of the cylindrical portion in conjunction with the reflier punch, and the presser member moving mechanism includes the pawls Timing adjustment means for adjusting the timing of moving the cylinder in the direction of the center of the cylindrical portion, wherein the timing adjustment means is the push button when the slide is at top dead center. It is made of the interval adjusting member for adjusting the pin and spacing of the moving ring.

  In this invention, the presser part is pressed from the outside of the cylindrical part to be formed with the fin collar provided on the fin, which is the workpiece, in conjunction with the flared punch. It can be processed into a desired shape, and the effect that the shape accuracy of the fin collar is improved is obtained.

(A) is a principal part expanded sectional view which shows a state when the fin collar of a fin is shape | molded by the bottom dead center of the fin collar molding die apparatus by Embodiment 1 of this invention, (b) is (a). The figure which shows the front-end | tip part shape of the shown reflier punch, (c) is a figure which shows the fin shown by (a). It is principal part sectional drawing which shows the state in the top dead center of the fin color molding die apparatus by Embodiment 1 of this invention. FIG. 3 is a cross-sectional view of a main part showing a state between a top dead center and a bottom dead center of the fin collar mold apparatus shown in FIG. 2. FIG. 3 is a cross-sectional view of a main part showing a state when the fin collar of the fin is molded at the bottom dead center of the fin collar molding die apparatus shown in FIG. 2. It is a perspective view which expands and shows the pressing member shown by FIG. 2, (a) is the state which the nail | claw opened, (b) shows the state which the nail | claw was closed. It is principal part sectional drawing which shows the state in the top dead center of the fin color molding die apparatus by Embodiment 2 of this invention. It is principal part sectional drawing which shows the state in the bottom dead center of the fin color molding die apparatus by Embodiment 3 of this invention. It is sectional drawing which expands and shows the structure of the pressing part of the pressing member which is the principal part of the fin color molding die apparatus by Embodiment 4 of this invention. It is sectional drawing which shows the structure of the pressing member used for the fin color molding die apparatus by Embodiment 5 of this invention.

Embodiment 1 FIG.
Hereinafter, a fin collar mold apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. In the drawings, the same reference numerals denote the same or corresponding parts.
In order to apply the molding die device of the present invention, in the previous step, a through hole is formed in a predetermined portion of a fin made of a thin metal plate such as aluminum, and the peripheral portion of the through hole is caused by press molding, It is necessary to prepare a preformed fin 1 having a cylindrical portion 1a as shown in FIG. Such a fin 1 can be easily obtained by using an existing conventional technique as shown in, for example, FIGS. The description about is omitted.

  As shown in FIGS. 1 (a) and 1 (b), the reflare punch 2 having a columnar central portion in the direction of the axis O is formed so that the diameter on the tip side (the lower side in the figure) is narrower than the central portion. The first molding surface 2a for constraining the inner peripheral surface of the cylindrical portion 1a (FIG. 2), particularly the central portion in the axis O direction, where the fin collar of the fin as the workpiece is to be formed, It has an R (curved surface) -shaped second molding surface 2b which is provided on the upper side in the figure and is continuous with the one molding surface 2a and curls the tip of the cylindrical portion 1a radially outward. The first molding surface 2a is formed in a linear shape in the direction of the axis O or a curved shape in which the central portion is slightly recessed.

  A presser member (R presser chuck) 3 is disposed so as to surround the outer peripheral part of the flared punch 2. As shown in FIG. 5, the presser member 3 is in sliding contact with the outer peripheral surface of the reflare punch 2 and can move relative to the reflare punch 2 in a coaxial manner, and a work piece side of the cylindrical portion 3 a (shown in the figure). Lower side) The end is the base, and the base is divided into three equal angles in the circumferential direction, each extending in the axial direction and radially expanding in the divergent form, and the cylindrical part 1a radially inward of the tip. A pressing portion 3b having an arcuate cross section for pressing the outer peripheral surface of each of the plurality of claws 3c protrudes, and a flange-shaped base portion 3d is formed at the upper end portion.

  The claw 3c spreads outward in the radial direction in a free state with respect to the cylindrical portion 3a. When an external force is applied from the outside to the center direction, the claw 3c is displaced by spring elasticity in the center portion direction. It is possible to advance and retreat in the radial direction. In the first embodiment, the presser portion 3b spans the base portion 10b of the fin collar 10 and the curling portion 10a at the distal end portion with the axial center portion of the fin collar 10 obtained as shown in FIG. 1 as the center. It is formed in a shape obtained by transferring the shape of the outer peripheral portion, and presses the outer peripheral surface of the cylindrical portion 1a of the fin 1 that is a workpiece when the claw 3c is completely closed. As a means for displacing the claw 3c toward the center at a predetermined timing, a pressing member moving mechanism 4 is provided on the outer peripheral portion of the pressing member 3.

  The pressing member moving mechanism 4 has a cylindrical shape that is slidably in contact with the outer peripheral surface of the cylindrical portion 3a constituting the pressing member 3 and is relatively movable coaxially with the cylindrical portion 3a. A flange portion 41a is provided at the upper end of the figure. A provided moving ring 41, a holding member 42 provided so as to surround the moving ring 41, and capable of moving the moving ring 41 in the axial direction, and a slide 63 of a press machine to be described later descending A presser pin 43 that moves the moving ring 41 to the outer peripheral portion of the claw 3c against the elastic force of the claw 3c at a predetermined timing in conjunction with the movement of the reflare punch 2 in the direction of the bottom dead center by the operation, and a slide An elastic member 44 composed of a compression spring interposed between the flange portion 41 a and the holding member 42 for returning the moving ring 41 to its original position when the 63 returns to the top dead center, and above the moving ring 41. Move It is constructed by using a mobile Ringufuta 45 to limit.

  FIG. 2 shows a state at the top dead center position of the fin collar molding die. A die 51 for fixing the fin 1 is fixed to a bed 52 which is a fixing portion of the press machine via a bolster 53. The On the upper surface portion of the die 51, when the block portion including the holding member 42 is lowered, the die 51 is brought into contact with the lower end surface 42a of the holding member 42 to restrict the holding member 42 from moving downward in the drawing. A plurality of shafts 54 formed in a length are projected.

  The reflier punch 2 is fixed to a slide 63 that is moved up and down by a press machine with a plate (X) 61 and a plate (U) 62. The presser pin 43 is fixed by a plate (X) 61 and a plate (Y) 64, and descends in synchronization with the slide 63 of the press. The plate (L) 66 is connected to the plate (Y) 64 via a connecting shaft 65 so as to be relatively movable in the vertical direction in the figure. A predetermined gap G is formed between the plate (Y) 64 and the plate (L) 66 at the top dead center.

  The plate (L) 66 is provided with a hole 66a through which the reflare punch 2 and the presser member 3 pass coaxially, and another hole 66b through which the presser pin 43 can be freely inserted, and the holding member 42 is fixed. ing. The holding member 42 is provided with a hole 42b through which the reflare punch 2, the pressing member 3, and the moving ring 41 pass coaxially. The presser member moving mechanism 4 excluding the presser pin 43 and the presser member 3 are fixed to a plate (L) 66 and further engaged with a plate (Y) 64 via a connecting shaft 65.

  Next, the operation of the first embodiment configured as described above will be described. First, as shown in FIG. 2, the preformed fin 1 has a cylindrical portion 1a in which a fin collar is to be formed so that the protruding direction of the cylindrical portion 1a is directed upward in the drawing, and the insertion portion 51a of the die 51 is inserted into the insertion hole 51a. It is fixed so that the centers coincide. Next, when the slide 63 of the press machine is lowered, the lower end surface 42a of the holding member 42 that is lowered in conjunction with the shaft 54 hits the shaft 54, and the block and plate (L) 66 including the holding member 42 move further downward. To be restricted. At this time, as shown in FIG. 3, the lower end portion of the claw 3 c of the presser member 3 is held at a position with a slight gap with respect to the upper surface of the fin 1.

  When the slide 63 of the press is further lowered, the gap G between the plate (Y) 64 and the plate (L) 66 is reduced, while the tip of the reflier punch 2 starts to enter the cylindrical portion 1a of the fin 1. At the same time, the presser pin 43 starts to push the moving ring 41 downward against the pushing force of the elastic member 44. Then, in the process where the slide 63 shown in FIG. 4 reaches the bottom dead center, the tip of the cylindrical portion 1a of the fin 1 is curled by the second molding surface 2b of the reflier punch 2 as the reflier punch 2 descends. At the same time as the reflare portion 10a is formed, the claw 3c of the presser member 3 is closed in the center direction by the lowering of the moving ring 41, and the presser portion 3b protruding toward the center side presses the outer peripheral surface of the cylindrical portion 1a. . In FIG. 4, the slide 63 is not shown.

  As described above, the axial central portion of the cylindrical portion 1a is sandwiched between the first molding surface 2a of the flared punch 2 and the pressing portion 3b at the tip of the claw 3c, so that the axial central portion of the cylindrical portion 1a is The fin collar 10 is obtained by being pressed against the first molding surface 2a of the reflare punch 2 and faithfully copying the shape of the first molding surface 2a. As shown in FIG. 4, when the slide 63 reaches the bottom dead center, the gap G between the plate (Y) 64 and the plate (L) 66 disappears. Further, the moving ring 41 is pushed down while sliding on the outer periphery of the pressing member 3, and when the bottom dead center is reached, the claw 3c is completely closed.

  As described above, according to the first embodiment, the inner surface of the cylindrical portion 1a where the fin collar 10 is to be formed is constrained by the reflier punch 2, and the presser portion 3b provided at the tip of the claw 3c of the presser member 3 from the outer surface. Therefore, the shape of the fin collar can be easily processed into a desired shape by reliably plastically deforming the fin collar 10 particularly in the central portion. For this reason, the shape accuracy of the fin collar 10 is improved, and an effect that variation can be reduced is obtained.

  When the shape accuracy of the fin collar 10 is improved as described above, when the heat exchanger is configured, the contact area between the outer peripheral surface of a pipe such as copper or aluminum that flows through the refrigerant and the fin collar 10 is sufficiently increased. And the variation can be reduced, so that the performance of the heat exchanger can be improved. Therefore, the heat exchanger can be reduced in size with the same efficiency, and energy efficiency can be improved because the energy efficiency is improved with the same size.

  In the above description, the case where there is one fin collar 10 to be processed into the fin 1 is shown. However, generally, a single fin has a plurality of through holes (cylindrical portions) in which the fin collar is to be formed. Provided in one or a plurality of rows at intervals, and correspondingly, a plurality of refractor punches 2 and the like are arranged in parallel at a predetermined interval, so that a plurality of fin collars can be processed simultaneously with a single press.

Embodiment 2. FIG.
Next, a fin collar mold apparatus according to Embodiment 2 of the present invention will be described with reference to a cross-sectional view of the main part at the top dead center shown in FIG. In this second embodiment, as shown in the figure, a donut is provided between the moving ring lid 45 and the presser pin 43 as a timing adjusting means for adjusting the timing when the claw 3c is moved toward the center of the cylindrical portion 1a. The disc-shaped interval adjusting member 46 is interposed. It should be noted that a plurality of thin thickness adjustment members 46 are prepared, and when the presser member moving mechanism 4 is assembled, the number of interposing members can be changed according to the timing of closing the claw 3c of the presser member 3. Good. The timing becomes earlier as the thickness is increased. Other configurations are the same as those of the first embodiment.

  In the second embodiment configured as described above, the position of the moving ring 41 in the axial direction is moved in advance in the direction of closing the claw 3c by the interval adjusting member 46, so that the claw 3c of the presser member 3 is moved. The closing timing can be advanced. For this reason, it is easy to adjust the uniformity of the shape of the individual fin collars 10 due to variations in the mechanical properties of the materials, variations in tool accuracy, and variations in the bottom dead center of the press machine due to variations in the outside air temperature. Become. Further, in the process of curling the tip of the cylindrical portion 1a, it is possible to prevent the tip portion and the presser portion 3b of the presser member 3 from interfering with each other to prevent the fin collar 10 obtained from being deformed or damaged.

  In the above description, the example in which the disc-shaped interval adjusting member 46 is used as the timing adjusting means is shown, but the present invention is not limited to this. For example, a screw hole (not shown) that is coaxial with the presser pin 43 is screwed into the flange portion 41a, and an adjustment bolt (not shown) is screwed into the screw hole from the lower side of the figure, so that the presser pin 43 is connected to the tip of the adjustment bolt. The moving ring 41 can be advanced downward in advance by pressing with. In this case, by selecting a position that does not interfere with the elastic member 44 and making a hole into which the driver is inserted from the lower side of the holding member 42, adjustment can be made even after assembly.

  In addition, various modifications and changes can be made, for example, by incorporating an adjustment screw at the tip of the presser pin 43 and making the length of the presser pin 43 variable. Further, when the timing adjusting means for closing the claw 3c as described above is configured to be performed by an adjustment bolt or an adjustment screw, the timing is advanced by setting the vicinity of the center of the adjustment range as a reference in advance. In addition, it is easy to delay the timing with the same configuration.

Embodiment 3 FIG.
Next, a fin collar molding die apparatus according to Embodiment 3 of the present invention will be described with reference to a cross-sectional view of relevant parts at the bottom dead center shown in FIG. The third embodiment is designed to prevent the claw 3c at the tip of the presser member 3 from coming into contact with the die 51 and being damaged when the bottom dead center of the press machine is lowered due to fluctuations in the outside air temperature. As shown in FIG. 4, an elastic member 55 is installed between a bolster 53 and a die 51 on a bed 52 of a press machine. In addition, as the elastic member 55, a coil spring, a leaf | plate spring, or a rubber material etc. can be used individually or in combination as appropriate. Other configurations are the same as those of the first embodiment.

  In the third embodiment configured as described above, when the bottom dead center position of the press fluctuates depending on the temperature or the like and further descends in the vertical direction than usual, the elastic member 55 contracts and the die 51 is covered. It descends with the fin 1 which is a workpiece. According to such a configuration, since the bottom dead center of the press fluctuates and the die 51 moves downward in accordance with the fluctuation of the bottom dead center even if the position of the bottom dead center falls below the normal position, the press member 3 It can be avoided that the claw 3c at the tip of the tip contacts the fin 1 on the die 51 and an excessive force is applied. For this reason, it is possible to prevent the presser portion 3b at the tip of the claw 3c from being damaged, the fin collar 10 can be molded as required, and a press failure can also be prevented.

Embodiment 4 FIG.
Next, a fin collar mold apparatus according to Embodiment 4 of the present invention will be described with reference to the cross-sectional view of FIG. In the figure, the presser part 3b protruding to the inner peripheral side of the claw 3c is formed with the tip radius presser part 3b1 that forms the curling shape of the tip part of the fin collar obtained and the shape of the root part of the fin collar obtained. The root R part 3b2 is provided. Other configurations are the same as those of the first embodiment.

  In the fourth embodiment configured as described above, the reflare punch 2 restrains the inner surface of the fin collar 10 shown in FIG. 1 obtained at the time of molding, and the plurality of claws 3c of the presser member 3 shown in FIG. Since the front end presser 3b1 provided at each front end and the presser 3b having the base end presser 3b2 are restrained, the axial central portion constituting the fin collar 10, the base 10b on the base side, and the front end Thus, it becomes possible to easily plastically deform the entire region of the flared portion 10a including the rounded surface (curved surface). For this reason, the shape accuracy of the fin collar 10 is further improved, and variations can be suppressed.

Embodiment 5 FIG.
Next, a fin collar molding die apparatus according to Embodiment 5 of the present invention will be described with reference to a cross-sectional view of FIG. In the figure, the outer peripheral surface S of the claw 3c of the presser member 3 is formed so as to become thinner in a tapered shape from the tip end side (the lower side in the figure) to the root side of the claw 3c. FIG. 9 shows a state in which the claw 3c is closed by a pressing member moving mechanism 4 (FIG. 2) not shown. Other configurations are the same as those of the first embodiment.

  In the fifth embodiment configured as described above, when the moving ring 41 shown in FIG. 2 is lowered, the outer peripheral surface S of the upper portion of the claw 3c is shaved in the initial stage. Since the inner peripheral surface does not contact the outer peripheral surface S of the claw 3c, the timing for closing the claw 3c is delayed. This corresponds to another form of the timing adjusting means described in the second embodiment. On the other hand, the outer peripheral surface S of the claw 3c becomes tapered toward the lower side of the figure, and the outer diameter increases, so that the closing speed increases. For this reason, since the outer periphery of the cylindrical part 1a which should become the fin collar 10 is pressed simultaneously with the start of curling of the tip part of the cylindrical part 1a by the reflier punch 2, the fin collar 10 is required. There is an advantage that it can be formed according to the shape, and the flared portion 10a of the fin collar 10 can be prevented from being caught and broken between the flared punch 2 and the pressing member 3.

  In the first to fifth embodiments, as the presser member 3, a cylindrical portion 3a that is slidably contacted with the outer peripheral portion of the reflier punch 2 and is relatively movable coaxially with the reflier punch 2, and a work piece of the cylindrical portion 3a. The object-side end is a base, the base is divided into three equiangular portions in the circumferential direction, each extends in the axial direction, and widens radially in the divergent form. Although the description has been given of the one having the plurality of claws 3c from which the pressing portion 3b that presses the outer peripheral surface is projected, the shape and configuration of the pressing member 3 as well as the number of divisions of the claws 3c are not limited to those shown in the drawing.

  In short, as long as it is divided and arranged so as to surround the molding surface of the reflare punch 2 and can be advanced and retracted in the radial direction, and a pressing portion for pressing the outer peripheral surface of the cylindrical portion 1a protrudes radially inward. Absent. When the structure of the presser member is changed, the presser member moving mechanism moves the presser member in the direction of the center of the cylindrical portion in one stroke of the press machine in conjunction with the reflier punch in accordance with the change. What is necessary is just to comprise. In addition, it goes without saying that various modifications and changes can be made within the scope of the present invention, for example, the inventions of Embodiments 1 to 5 can be appropriately combined.

  DESCRIPTION OF SYMBOLS 1 Fin, 1a Cylindrical part, 10 Fin collar, 10a Reflare part, 10b Base part, 2 Reflare punch, 2a 1st shaping | molding surface, 2b 2nd shaping | molding surface, 3 Pressing member, 3a Cylindrical part, 3b Holding part, 3b1 Tip radius presser, 3b2 Root radius presser, 3c Claw, 3d Base, 4 Presser member moving mechanism, 41 Moving ring, 41a Flange, 42 Holding member, 42b Hole, 43 Presser pin, 44 Elastic member, 45 Moving ring lid, 46 Space adjustment member (timing adjustment means), 51 dies, 52 bed, 53 bolster, 54 shaft, 55 elastic member, 61 plate (X), 62 plate (U), 63 slide, 64 plate (Y), 65 connecting shaft , 66 Plate (L), 6 a hole, 66b hole, G gap, S outer peripheral surface.

Claims (6)

A reflare punch that is fixed with respect to a slide of a press machine and restrains an inner peripheral surface of a cylindrical part to form a fin collar provided on a fin that is a workpiece fixed to a fixed part of the press machine; A presser member having a plurality of diametrically movable claws, each of which is divided and arranged so as to surround the reflare punch and in which a presser part that presses the outer peripheral surface of the cylindrical part is protruded radially inward. And a presser member moving mechanism that moves the claw of the presser member in the direction of the center of the cylindrical part in conjunction with the movement of the presser member, and moves the claw in the direction of the center of the cylindrical part. Timing adjustment means for adjusting timing, wherein the timing adjustment means is an interval for adjusting an interval between the presser pin and the moving ring when the slide is at a top dead center; Fin collar molding die apparatus characterized by comprising a section member.   The holding member has a cylindrical portion that is slidably contacted with the outer peripheral portion of the reflare punch and is coaxially movable with respect to the reflare punch, and the plurality of claws have a workpiece side end portion of the cylindrical portion as a root. Each of them extends in the axial direction, and the presser portion side provided at the tip thereof is radially expanded in a divergent shape, and can be advanced and retracted in the radial direction by elasticity with the cylindrical portion. Item 2. A fin color molding die apparatus according to Item 1.   The presser member moving mechanism includes a cylindrical moving ring that is slidably contacted with the outer peripheral portion of the cylindrical portion of the presser member and is coaxially movable with respect to the cylindrical portion, and a bottom dead center direction of the reflare punch by the slide 3. A fin collar according to claim 2, wherein a presser pin is used to move the moving ring to the outer peripheral portion of the claw against the elastic force of the claw at a predetermined timing in conjunction with movement to the claw. Molding equipment. The fin collar mold apparatus according to claim 2 or 3 , wherein an outer peripheral surface of the claw is formed in a tapered shape so as to taper from a tip end side of the claw toward the base side. The presser part formed on the tip part of the claw includes a tip radius presser part that forms a curling shape of the tip part of the fin collar to be obtained and a root radius presser part that forms the shape of the root part of the fin collar to be obtained. It has, The fin color molding die apparatus in any one of Claims 1-4 characterized by the above-mentioned. The fin, which is the workpiece, is fixed to a die having an insertion hole through which a tip portion of the reflare punch is inserted, and the die is supported by an elastic member with respect to the fixing portion of the press machine. The fin collar mold apparatus according to any one of claims 1 to 5 , wherein:

Images