JP6032750B2 - Punch and press molding machine - Google Patents

Description

  The present invention relates to a punch for press-forming a bottomed cylindrical workpiece and a press-forming machine.

  Conventional press molding machines of this type include forcibly supplying gas to the space formed between the punch and the bottomed cylindrical workpiece during the retraction process of pulling out the punch from the bottomed cylindrical workpiece. In addition, there is known one that suppresses deformation due to a pressure difference between the inside and outside of a bottomed cylindrical workpiece (hereinafter referred to as “pressure difference deformation” as appropriate) (for example, see Patent Document 1).

JP 2001-150043 A (paragraphs [0031] [0032], FIG. 1)

  However, in the conventional press molding machine described above, it is difficult to accurately match the volume of the space and the gas supply amount so that the gas does not become excessive or insufficient with respect to the volume of the space.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a punch and a press molding machine capable of preventing pressure difference deformation of a bottomed cylindrical workpiece more easily and surely than in the past. .

  The punch according to the first aspect of the present invention, which has been made to achieve the above object, is a punch for press-molding a bottomed cylindrical workpiece, and is opened to the front end surface of the punch, and the punch is pulled out from the bottomed cylindrical workpiece. A forced air supply passage for releasing the gas supplied from the gas supply source into the bottomed cylindrical workpiece and one end opened to the atmosphere and the other end opened to the front end surface of the punch or forced supply It is characterized in that it has an auxiliary open flow channel communicating with the air flow channel.

  The invention of claim 2 is characterized in that, in the punch of claim 1, the tip of the punch has a flat plate shape in order to form a bottomed cylindrical workpiece into a flat and thin shape.

  According to a third aspect of the present invention, in the punch according to the first or second aspect, the front end of the punch is provided with a first front end protrusion projecting sideways, and the first front end protrusion is provided with an auxiliary open channel. It is characterized by penetrating through the punch in the linear motion direction.

  According to a fourth aspect of the present invention, in the punch according to any one of the first to third aspects, the tip of the punch is provided with a second tip protrusion protruding laterally, and the second tip protrusion. A base end protrusion that is formed at the base end of the punch and that faces the second front end protrusion in the direction of the punch linear movement, and a base end protrusion. And an external channel that connects one end of the internal channel and the forced air supply channel, with one end open to the surface facing the second tip protrusion and the other end connected to the gas supply source. It is characterized by having a pipe.

  A press molding machine according to a fifth aspect of the invention is characterized in that the punch according to any one of the first to fourth aspects is provided.

  A press molding machine according to a sixth aspect of the present invention includes a plurality of processing stages each having the punch according to any one of the first to fourth aspects, and a common gas supply to the plurality of punches. It is configured to supply gas from a source, and is characterized in that it is provided between a gas supply source and a plurality of punches, and includes a plurality of supply amount adjusting units for adjusting the gas supply amount. .

[Inventions of Claims 1, 2, 5, and 6]
According to the first, fifth and sixth aspects of the present invention, in the retreating process of pulling out the punch from the bottomed cylindrical workpiece, the gas supply amount is insufficient with respect to the volume of the space formed in the bottomed cylindrical workpiece. If it is, the outside air is taken in from the auxiliary open flow path due to the pressure difference between the internal pressure and the external pressure in the space. On the other hand, when the supply amount of gas is excessive with respect to the volume of the space portion, the gas in the space portion is released to the outside through the auxiliary open flow path due to the pressure difference between the internal pressure and the external pressure of the space portion. That is, even if the volume of the space portion does not match the gas supply amount, the excess and deficiency can be absorbed (offset) by supply / exhaust through the auxiliary open flow path, and the space portion in the punch retreat process The pressure difference between the internal pressure and the external pressure can be kept small. As a result, it is possible to more easily and reliably prevent the pressure difference deformation of the bottomed cylindrical workpiece during the retraction process of the punch.

  Here, the present invention does not particularly limit the shape of the punch, but when the bottomed cylindrical workpiece is formed into a flat and thin shape by a flat plate-shaped punch, Both side walls facing each other in the flat direction are easily deformed by a pressure difference. Therefore, the present invention is particularly effective when applied to a punch having a flat tip at the tip of the punch in order to form a bottomed cylindrical workpiece into a flat and thin shape as in the invention of claim 2.

  According to the invention of claim 6, gas can be distributed and supplied from a common gas supply source to each of the plurality of punches provided in each of the plurality of machining stages, and gas can be supplied to each of the plurality of punches. The amount can be adjusted individually.

[Invention of claim 3]
According to the third aspect of the present invention, a first tip protrusion protruding laterally is formed at the tip of the punch, and the auxiliary opening flow path penetrates the first tip protrusion in the linear movement direction of the punch. Therefore, the channel length of the auxiliary open channel can be made relatively short, and the flow resistance of the outside air or gas passing through the auxiliary open channel can be suppressed. Thereby, air supply / exhaust through the auxiliary open channel can be performed sufficiently and quickly. Moreover, it can form easily compared with the case where the auxiliary | assistant open flow path is penetrated over the full length of a punch.

[Invention of claim 4]
According to the invention of claim 4, since the forced air supply channel is formed at the second tip protrusion, the forced air supply channel is formed more easily than when the forced air supply channel is penetrated over the entire length of the punch. be able to. In addition, since both end portions of the external pipe are fixed to the second front end protrusion and the base end protrusion, interference between the punch peripheral component and the external pipe can be avoided.

1 is a side sectional view of a press molding machine provided with a punch according to a first embodiment of the present invention. Side cross-sectional view of the press molding machine in the middle of ascending from bottom dead center to top dead center Side sectional view of the press forming machine during the punch retraction process for a bottomed cylindrical workpiece. Front sectional view of press mold part Side sectional view of the base end of the punch die Front sectional view of the base end of the punch die (A) Side view of punch, (B) Front view Block diagram of gas supply circuit Perspective view of molded bottomed cylindrical workpiece Cross-sectional view of the workpiece during the punch retraction process Side sectional view of punch and press mold part according to second embodiment (A) perspective view, (B) cross-sectional view of a punch according to a modified example

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a press mold part 60 provided in the press molding machine of the present invention. The press molding machine is a “transfer press machine” having a plurality of processing stages, which sequentially transports the bottomed cylindrical workpiece W between the plurality of processing stages and has a bottomed cylindrical shape at each processing stage. Press forming is performed on the workpiece W. The press molding machine includes a movable die 61 (upper die) and a fixed die 62 (lower die) that are vertically opposed to each other. A plurality of punch molds 10 (only one punch mold 10 is shown in FIG. 1) protrudes downward from the movable mold 61, and these punch molds 10 are bottomed cylinders. The workpieces W are arranged in a line in the conveyance direction of the workpieces W (the left-right direction in FIG. 4; hereinafter referred to as “work conveyance direction H2”).

  The fixed die 62 is formed by fixing a plurality of dies 66 on the upper surface of the central portion of the die holder 63. These dies 66 are arranged in a line in the workpiece conveying direction H2 corresponding to the punch mold 10 and have forming holes 66A opened on the upper surface. Then, the movable die 61 is moved up and down by a press ram (not shown), so that the tips (punch heads 12) of the punches 11 provided in the punch dies 10 enter the respective molding holes 66A. The shaped workpiece W is pushed into each molding hole 66A, and predetermined press molding is performed.

  On the upper surface of the die holder 63, a transfer 50 for conveying the bottomed cylindrical workpiece W between adjacent processing stages is provided. The transfer 50 includes a pair of fingers 51 that can grip the bottomed cylindrical workpiece W from the front-rear direction H1 (left-right direction in FIG. 1) orthogonal to the workpiece transfer direction H2, for each processing stage. The made finger 51 slides with a predetermined stroke in the workpiece transfer direction H2. Then, each time the movable die 61 moves up and down, the transfer 50 sequentially conveys the bottomed cylindrical workpiece W to the adjacent processing stage (die 66). As a result, the bottomed cylindrical workpiece W is subjected to press forming a plurality of times, and is gradually formed into a flat and thin final shape shown in FIG.

  Now, as shown in FIG. 1, the punch die 10 includes a punch 11, a punch holder 20, and a manifold 30. The punch 11 is fixed to the movable die 61 by the punch holder 20, and the manifold 30 is overlapped and fixed on the upper surface of the punch holder 20.

  The punch head 12 which is the tip of the punch 11 has a vertically long rectangular flat plate shape (see FIG. 7A), and the entire punch 11 including the punch head 12 is flat in the same direction as the punch head 12. (See FIG. 7B). The punch head 12 includes a pair of tip protrusions 13 and 13 that protrude in both width directions with respect to the axially intermediate portion of the punch 11. Further, a portion of the punch 11 other than the punch head 12 has a flat plate shape thicker than the punch head 12, and a pair of base ends projecting in both width directions are formed on the base end portion 14 </ b> A of the punch 11. Protrusions 14 are provided. That is, the base end protrusion 14 and the tip protrusion 13 are opposed to each other in the linear movement direction of the punch 11 with respect to the forming hole 66A.

  The punch holder 20 is composed of a metal block that is flat in the workpiece conveyance direction H2. The punch holder 20 is formed with vertical and horizontal positioning grooves 21 (see FIG. 4) that are open on the lower surface and both front and rear surfaces. The vertical / horizontal positioning groove 21 is a rectangular groove having a rectangular cross section, and the base end portion 14A of the punch 11 is fitted into the vertical / horizontal positioning groove 21 so that the punch 11 is moved in the plate thickness direction (work conveyance) and the vertical direction ( In the vertical direction).

  A width direction positioning member 22 is attached to the front surface of the lower end of the punch holder 20. The width direction positioning member 22 is composed of a horizontally long metal block (long in the workpiece conveying direction H2), and is fixed to the punch holder 20 by a plurality of bolts B4 and B4 in a state of straddling the vertical and horizontal positioning grooves 21. (See FIG. 4). Here, the gas introduction hole 22A (see FIG. 5) passes through the center portion in the longitudinal direction of the width direction positioning member 22, and a hose joint 22J is attached to the open end thereof. The punch 11 and a gas supply circuit 55 (see FIG. 8) described later are connected via the hose joint 22J.

  The width direction positioning member 22 is in surface contact with the side end surface of one base end protrusion 14 provided on the base end portion 14A of the punch 11 to position the punch 11 in the width direction. Moreover, the base end protrusion 14 and the width direction positioning member 22 are fixed by a plurality of bolts B5 and B5 (see FIG. 4).

  That is, the punch 11 is positioned with respect to the punch holder 20 in three axial directions (front and rear, left and right, and upper and lower directions) orthogonal to each other by the vertical and horizontal positioning grooves 21 and the width direction positioning members 22.

  Further, the punch 11 is fixed to the punch holder 20 by three bolts B1. As shown in FIG. 5, these bolts B <b> 1 penetrate the punch holder 20 in the vertical direction and protrude from the bottom surface of the vertical and horizontal positioning grooves 21. Three screw holes N <b> 2 formed in the base end portion 14 </ b> A of the punch 11. Are tightened respectively.

  The manifold 30 is configured by a substantially rectangular parallelepiped metal block extending in the front-rear direction H1, and is fixed to the upper surface of the punch holder 20 by a plurality of bolts (not shown).

  As shown in FIG. 7A, a pair of cooling vertical holes 15 are provided at two positions near both ends in the width direction of the punch 11. These cooling vertical holes 15, 15 extend from the base end face of the punch 11 to a position closer to the tip end, and a pair of refrigerant pipes 16, 16 are inserted in a loosely fitted state inside thereof. Further, pipe external refrigerant passages 15A and 15A are formed between the refrigerant pipes 16 and 16 and the inner surfaces of the cooling vertical holes 15 and 15 (see FIG. 5). Here, the pair of cooling vertical holes 15, 15 are arranged within a range of 1/3 of the width of the punch 11 from both ends in the width direction of the punch head 12.

  As shown in FIG. 5, inside the punch holder 20, a pair of extended vertical holes 23, 23 formed through the extended lines of the pair of cooling vertical holes 15, 15 and a pair of extended vertical holes A pair of extended large-diameter portions 24 and 24 are formed by expanding the diameter of the end portion on the side away from the punch 11. Further, as shown in FIG. 6, the punch holder 20 is bent into the punch holder 20 after branching from the front of the pair of extended large diameter portions 24, 24 to the side of the pair of extended vertical holes 23, 23. Then, a pair of first branch passages 25, 25 extending in parallel with the pair of extended large diameter portions 24, 24 and a side branch from the pair of extended large diameter portions 24, 24 are bent and bent. A pair of second branch paths 26, 26 extending in parallel with the pair of extended large diameter portions 24, 24 are formed (in FIG. 6, the first branch path 25 and the second branch path 26 are Only one of each is shown). Connection portions between the cooling vertical holes 15 and 15 and the extended vertical holes 23 and 23 are sealed by a seal member 27 (for example, an O-ring). In addition, the code | symbol 29 in FIG. 6 is a closure plug.

  The pair of refrigerant pipes 16, 16 are inserted into the cooling vertical holes 15, 15 in the punch 11 from a pair of extended large diameter portions 24, 24 formed in the punch holder 20. In addition, plugs 17 and 17 are attached to the base ends of the pair of refrigerant pipes 16 and 16, respectively. These plugs 17, 17 are fitted inside the extended large diameter portions 24, 24 to block between the refrigerant pipes 16, 16 and the inner surfaces of the extended large diameter portions 24, 24. The plugs 17 and 17 have a hollow structure, and the refrigerant flow paths 16A and 16A in the pipes 16 and 16 and the second branch paths 26 and 26 in the refrigerant pipes 16 and 16 are provided via the hollow portions 17A and 17A. Communicate. In addition, the code | symbol 19 in FIG.5 and FIG.6 is a closure plug.

  Inside the manifold 30, a pair of first flow paths 31, 31 communicating with the pair of first branch paths 25, 25 and a pair of second flow paths communicating with the pair of second branch paths 26, 26. Channels 32 and 32 are formed (see FIG. 6). The first flow paths 31, 31 extend upward on the extension lines of the first branch paths 25, 25 and then bend, and extend horizontally toward the front surface of the manifold 30 (the front side in FIG. 6). On the other hand, the second flow paths 32, 32 extend upward on the extension line of the second branch paths 26, 26, then bend, and extend horizontally toward the front surface of the manifold 30 (the front side in FIG. 6). Yes. The end openings of the first flow paths 31 and 31 and the second flow paths 32 and 32 are all open to the front surface of the manifold 30, and the four end openings are respectively connected to the hose joints 31J. , 32J are attached (see FIG. 4). Here, the connection part between the first flow paths 31 and 31 and the first branch paths 25 and 25 and the connection part between the second flow paths 32 and 32 and the second branch paths 26 and 26 are respectively a seal member 28, It is sealed by 28 (for example, O-ring).

  A refrigerant supply / discharge hose (not shown) is connected to each of the hose joints 31J and 32J. For example, a refrigerant supply hose is connected to the hose joints 32J and 32J of the second flow paths 32 and 32, and a refrigerant discharge hose is connected to the hose joints 31J and 31J of the first flow paths 31 and 31. Is done. In this case, the refrigerant flows in the punch die 10 as follows. The refrigerant that has flowed into the punch mold 10 from the second flow path 32 of the manifold 30 enters the in-pipe refrigerant flow path 16A via the second branch path 26 and the hollow portion 17A. The refrigerant that has passed through the in-pipe refrigerant flow path 16A flows out from the tip of the refrigerant pipe 16 to the pipe external refrigerant flow path 15A, passes through the cooling vertical holes 15 and the extended vertical holes 23, and the first branch path 25 and the first It is discharged to the outside of the punch die 10 through the flow path 31. Then, the punch head 12 is cooled by the refrigerant flowing through the in-pipe refrigerant flow path 16A and the out-pipe refrigerant flow path 15A. Thereby, the whole punch head 12, especially the part near the both ends of the width direction of the punch head 12, can be cooled effectively, and the shaping | molding defect of the bottomed cylindrical workpiece W by frictional heat can be suppressed.

  As described above, the punch head 12 has a pair of tip protrusions 13 and 13 protruding in both width directions, and one tip protrusion 13 (the “first tip protrusion of the present invention”). ), The auxiliary open flow path 18B is formed to penetrate therethrough, and the forced air supply flow path 18A is formed to penetrate the other front end protrusion 13 (corresponding to the “second front end protrusion” of the present invention). (See FIG. 7A). The forced air supply flow path 18A and the auxiliary open flow path 18B extend in the linear movement direction (axial direction) of the punch 11, one end opens to the base end surface 13A of the front end protrusion 13, and the other end extends to the front end protrusion 13. Open to the tip of the surface. The channel diameters of the forced air supply channel 18 </ b> A and the auxiliary open channel 18 </ b> B are the same diameter and smaller than the cooling vertical hole 15. The diameters of the forced air supply flow path 18A and the auxiliary open flow path 18B may be different from each other (for example, the auxiliary open flow path 18B may be slightly larger in diameter than the forced air supply flow path 18A).

  An external pipe 40 is connected to one end of the forced air supply passage 18A. The external pipe 40 is, for example, a pressure-resistant hose, and a tip portion thereof is inserted into the forced air supply passage 18A in an airtight state. The external pipe 40 extends parallel to the linear motion direction of the punch 11 on the extension line of the forced air supply passage 18A. The other end of the external pipe 40 is connected to an internal flow path 41 formed in the punch 11. Here, since both ends of the external pipe 40 are fixed to the front end protrusion 13 and the base end protrusion 14, the external pipe 40 is not deformed as the punch 11 moves up and down. Therefore, interference between punch peripheral parts such as the stripper 68 and the transfer 50 (finger 51) and the external pipe 40 can be avoided. The external pipe 40 may be a non-flexible pipe.

  The internal flow path 41 is formed only in one base end protrusion 14 that protrudes on the same side as the front end protrusion 13 through which the forced air supply flow path 18A passes, of the pair of base end protrusions 14 and 14. . Further, the internal flow path 41 intersects the tip of the screw hole N2 formed in one base end protrusion 14 among the three screw holes N2 formed in the base end portion 14A of the punch 11. Specifically, the internal flow path 41 extends downward on the extension line of the screw hole N2, and extends in the width direction from the front end of the screw hole N2 and the vertical hole 41A opened to the surface facing the front end protrusion 13. A lateral hole 41 </ b> B that is open on the side end surface of the end protrusion 14 is provided. The horizontal hole 41B communicates with the gas introduction hole 22A, and the other end of the external pipe 40 is inserted into the vertical hole 41A in an airtight state.

  That is, the gas introduction hole 22A, the internal flow path 41, the external pipe 40, and the forced air supply flow path 18A communicate with each other, and a flow path of a gas (for example, compressed gas such as factory air) supplied from the gas supply source G1. It has become.

  Here, in the present embodiment, press forming by the punch 11 described above is performed in at least the final processing stage S1 and the preceding processing stage S2 among the plurality of processing stages provided in the press molding machine. It is configured. A gas is supplied from a common gas supply source G1 to the plurality of punches 11.

  FIG. 8 shows a gas supply circuit 55 provided in the press molding machine. As shown in the figure, the gas supply circuit 55 includes a junction 56 that distributes the gas supplied from the gas supply source G1, and a plurality of gas pipes 57 extending downstream from the junction 56 include processing stages S1, S1. Each is connected to the punch 11 of S2 (specifically, the hose joint 22J). An open / close valve 58 (specifically, a solenoid valve) is provided upstream of the junction 56, and a flow rate adjustment for adjusting the amount of gas supplied to the punch 11 is provided in the middle of the plurality of gas pipes 57. A valve 59 (corresponding to the “supply amount adjusting unit” of the present invention) is provided. The gas supply to each of the plurality of punches 11 can be collectively turned on / off by the opening / closing valve 58, and the gas supply amount to each of the plurality of punches 11 can be individually adjusted by the flow rate adjusting valve 59.

  The configuration of the present embodiment is as described above. Next, the operation of this embodiment will be described. When the bottomed cylindrical workpiece W is set on each processing stage of the press molding machine, the movable die 61 descends from the top dead center and the tip of the punch 11 (punch head 12) is inserted into the bottomed cylindrical workpiece W. Then, the bottomed cylindrical workpiece W is pushed into the forming hole 66A by further lowering the movable die 61 (see FIG. 1). In this process, the bottomed cylindrical workpiece W is subjected to press molding (drawing or ironing).

  The movable die 61 (see FIG. 1 and FIG. 2) that has reached the bottom dead center turns upward, and the bottomed cylindrical workpiece W is sandwiched between the punch head 12 and the knockout 67 provided at the back of the forming hole 66A. In this state, the inside of the forming hole 66A is raised to the upper surface of the die 66. The knockout 67 rises to the upper surface of the die 66 and stops. However, since the bottomed cylindrical workpiece W after press molding is in close contact with the outer surface of the punch head 12, the knockout 67 is completely removed from the molding hole 66A. It rises with the punch 11. The bottomed cylindrical workpiece W that has risen together with the punch 11 hits the stripper 68 fixedly arranged above the transfer 50, and is prevented from further rising (state of FIG. 3). In this state, when the movable die 61 is further raised, the punch head 12 starts to retract with respect to the bottomed cylindrical workpiece W, and a space SP is formed between the tip of the punch head 12 and the bottomed cylindrical workpiece W. Is done. The volume of the space portion SP increases as the punch head 12 moves backward (the movable die 61 rises).

  The press molding machine starts supplying gas almost at the same time when the punch head 12 starts to move backward with respect to the bottomed cylindrical workpiece W. Specifically, the opening / closing valve 58 of the gas supply circuit 55 is opened at the timing when the bottomed cylindrical workpiece W comes into contact with the stripper 68, and gas is simultaneously supplied at a predetermined flow rate for each processing stage S1, S2. Supply is started. The gas passes through the gas introduction hole 22A, the internal flow path 41, the external pipe 40, and the forced air supply flow path 18A in this order, and is released to the space portion SP, thereby suppressing a pressure drop due to an increase in the volume of the space portion SP.

  Here, in the retreat process of the punch 11, the gas supply amount adjusted by the flow rate adjusting valve 59 does not match the volume of the space portion SP, and the gas supply amount becomes excessive or insufficient with respect to the volume of the space portion SP. There is a case. On the other hand, according to the configuration of the present embodiment, when the gas supply amount is insufficient with respect to the volume of the space SP, the auxiliary open flow is caused by the pressure difference between the internal pressure and the external pressure of the space SP. Outside air is taken in from the path 18B. On the other hand, when the gas supply amount is excessive with respect to the volume of the space SP, the gas in the space SP is released through the auxiliary open flow path 18B. That is, even if the volume of the space SP does not match the gas supply amount, the excess and deficiency can be absorbed (cancelled) by supply / exhaust through the auxiliary open flow path 18B, and the retraction process of the punch 11 The pressure difference between the internal pressure of the space SP and the atmospheric pressure can be kept small. Thereby, the pressure difference deformation | transformation (crushing and expansion | swelling) of the bottomed cylindrical workpiece W can be prevented more easily and reliably than before. In addition, since the pressure difference between the internal pressure and the external air pressure in the space SP is suppressed to be small, the punch 11 can be pulled out from the bottomed cylindrical workpiece W relatively smoothly. Furthermore, the operator does not need to be precise in adjusting the flow rate adjustment valve 59, and only a rough adjustment is required to improve the working efficiency.

  More specifically, when the bottomed cylindrical workpiece W has a sufficient thickness or has a shape that is difficult to deform at atmospheric pressure (for example, a cylindrical shape), the gas with respect to the volume of the space SP Even if the excess / deficiency amount is somewhat large, it is considered that the pressure difference deformation can be avoided. However, when the bottomed cylindrical workpiece W is relatively thin or has a shape that is easily deformed by pressure difference (a flat thin shape as shown in FIG. 9, the two-dot chain line in FIG. 10 is an example of the pressure difference deformation in the flat direction. In other words, it is necessary to minimize the excess or deficiency of gas in the space SP. On the other hand, according to the present embodiment, all or a part of the excess or deficiency of the gas can be absorbed (offset) by supply / exhaust through the auxiliary open flow path 18B. Regardless of the wall thickness or shape, it is possible to reliably prevent pressure difference deformation.

  Moreover, according to this embodiment, since the auxiliary | assistant open flow path 18B has penetrated the front-end | tip protrusion 13 which protruded in the width direction of the punch 11, the flow path length of the auxiliary | assistant open flow path 18B is restrained comparatively short. The flow resistance of the outside air or gas passing through the auxiliary open channel 18B can be suppressed. Thereby, air supply / exhaust through the auxiliary open flow path 18B can be sufficiently and quickly performed. Further, even when the press working oil enters the auxiliary open channel 18B, it can be quickly discharged by the outside air or gas passing through the auxiliary open channel 18B.

  In addition, according to the present embodiment, the refrigerant supply / discharge hose joints 31J and 32J and the gas supply hose joint 22J are arranged on the side surfaces facing the same direction in the punch mold 10, so that The refrigerant supply / discharge hose and the gas supply hose can be connected from the same direction, and workability can be improved.

  Further, according to the present embodiment, the forced air supply flow path 18A and the auxiliary open flow path 18B penetrate the front end protrusions 13 and 13 in the linear motion direction of the punch 11, respectively, so that these extend to the entire length of the punch 11. Compared with the case where it penetrates over, it can form easily.

  Further, it is possible to cool the portions near both ends in the width direction of the punch head 12 by the gas and the outside air passing through the forced air supply channel 18A and the auxiliary open channel 18B.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIG. The punch 11 according to the present embodiment is formed in the punch 11 and a forced air supply channel 180A that is formed in the punch 11 and opens to the front end surface of the punch 11, and discharges the gas supplied from the gas supply source G1 to the space SP. Thus, one end is open to the atmosphere, and the other end is provided with an auxiliary open flow path 180B communicating with the forced air supply flow path 180A. The forced air supply flow path 180A extends from the front end surface of the punch 11 to the base end portion 14A in the linear movement direction of the punch 11, bends at the base end portion 14A of the punch 11 and extends in the width direction, and communicates with the gas introduction hole 22A. ing. Further, the auxiliary open flow path 180B is formed at the base end side position from the punch head 12, and is open to one side surface of the punch 11 in the width direction or the flat direction. In the punch 11 of this embodiment, a forced air supply flow path 180A is provided between the pair of cooling vertical holes 15 and 15, but the position of the cooling vertical hole 15 (one end in the width direction of the punch 11). A forced air supply flow path 180A may be provided at a position close to it. Since other configurations are the same as those of the first embodiment, detailed description thereof is omitted.

  According to the present embodiment, the gas supplied from the gas supply source G1 is released from the gas introduction hole 22A through the forced air supply flow path 180A to the space SP and suppresses a pressure drop due to an increase in the volume of the space SP. To do. Here, when the supply amount of the gas is insufficient with respect to the volume of the space part SP, the outside air is taken in from the auxiliary open flow path 180B and discharged together with the gas to the space part SP. On the other hand, when the supply amount of the gas is excessive with respect to the volume of the space SP, the gas is released from the auxiliary open flow path 180B without reaching the space SP. That is, the present embodiment also has the same effect as the first embodiment.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the first and second embodiments, the tip of the punch 11 has a flat plate shape. However, the tip of the punch may be cylindrical or prismatic. Moreover, the structure which does not have the front-end | tip protrusions 13 and 13 may be sufficient.

  (2) In the first embodiment, the tip of the punch 11 has a flat plate shape, the forced air supply passage 18A passes through one of the pair of tip protrusions 13 and 13 protruding in both width directions, and the other is Although the auxiliary open flow path 18B has penetrated, as shown in FIG. 12 (A), a tip protrusion 130 is provided in which the entire tip of the punch 110 protrudes sideways, and the tip protrusion 130 is forcedly supplied with air. The path 18A and the auxiliary open flow path 18B may pass through. At this time, one or both of the forced air supply flow path 18A and the auxiliary open flow path 18B may be provided.

  (3) In the first and second embodiments, the forced air supply channels 18A and 180A and the auxiliary open channels 18B and 180B are provided one by one, but either one or a plurality of both may be provided. .

  (4) In the second embodiment, the auxiliary open flow path 180B is provided at the base end side position with respect to the punch head 12, but as shown in FIG. The auxiliary open flow path 180B opened to the atmosphere may be configured to extend obliquely in the punch head 12 and communicate with the forced air supply flow path 180A.

  (5) In the above embodiment, the punch mold 10 is provided with the refrigerant circuit for cooling the punch 11 from the inside. However, a configuration without the refrigerant circuit may be used.

  (6) Auxiliary open flow path 18B formed in the punch 11 of the first embodiment (auxiliary open flow path with one end opened to the atmosphere and the other end opened to the front end surface of the punch), and the punch of the second embodiment 11 may include both of the auxiliary open flow path 180B formed at 11 (an auxiliary open flow path having one end opened to the atmosphere and the other end communicated with the forced air supply flow path).

  (7) In the first and second embodiments described above, press forming with the punch 11 to which the present invention is applied is performed at the final processing stage S1 and the preceding processing stage S2 among the plurality of processing stages. However, press forming with the punch 11 to which the present invention is applied may be performed at any of a plurality of processing stages.

  (8) In the first and second embodiments described above, the present invention is applied to a press molding machine (transfer press machine) provided with a plurality of processing stages, but a single-shot press provided with only one processing stage. The present invention may be applied to a molding machine.

  (9) The press molding machine may have a configuration in which the punch 11 of the first embodiment and the punch 11 of the second embodiment are provided in separate processing stages.

DESCRIPTION OF SYMBOLS 11 Punch 12 Punch head 13 Tip protrusion 14 Base end protrusion 18A Forced air supply flow path 18B Auxiliary open flow path 40 External pipe 41 Internal flow path 55 Gas supply circuit 59 Flow rate adjustment valve (supply amount adjustment part)
180A Forced air supply flow path 180B Auxiliary open flow path G1 Gas supply source S1, S2 Processing stage SP Space part W Bottomed cylindrical workpiece

Claims (6)

A punch for press-molding a bottomed cylindrical workpiece,
A forced air supply passage for releasing the gas supplied from a gas supply source into the bottomed cylindrical workpiece when the punch is pulled out from the bottomed cylindrical workpiece;
A punch having one end opened to the atmosphere and the other end opened to the tip end surface of the punch, or an auxiliary open flow path communicating with the forced air supply flow path.   The punch according to claim 1, wherein the tip of the punch has a flat plate shape in order to form the bottomed cylindrical workpiece into a flat and thin shape.   A first tip protrusion protruding laterally is provided at the tip of the punch, and the auxiliary open flow path passes through the first tip protrusion in the linear movement direction of the punch. The punch according to claim 1 or 2. A second tip protrusion protruding laterally is provided at the tip of the punch, and the forced air supply passage passes through the second tip protrusion in the linear movement direction of the punch,
A base end protrusion formed on the base end of the punch and facing the second front end protrusion in the linear movement direction of the punch;
An internal flow path formed at the base end protrusion and having one end open to a surface facing the second tip protrusion, and the other end communicated with the gas supply source;
The punch according to any one of claims 1 to 3, further comprising an external pipe that communicates one end of the internal flow path and the forced air supply flow path.   A press molding machine comprising the punch according to any one of claims 1 to 4. A plurality of processing stages each having the punch according to any one of claims 1 to 4, and configured to supply gas from a common gas supply source to the plurality of punches,
A press molding machine, comprising: a plurality of supply amount adjusting units provided between the gas supply source and the plurality of punches, respectively, for adjusting the supply amount of the gas.

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