JP2005081436A - Press die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press die which is less costly than a conventional one and can easily accommodate itself to a change in the type of a workpiece. <P>SOLUTION: In the press die 20, the motions of a knockout pin 45 and a burring punch 40 synchronizing with a punch 21 can be realized by a simple composition in which the knockout pin 45 and burring punch 40 butt against a butting member 35 so that the press die 20 can be less costly than the conventional press die using a hydraulic circuit. Further, since the timing of the motions of the driven shaft members 40 and 45 can be easily changed by changing the length of the driven shaft members 40 and 45, the press die 20 can more easily accommodate itself to any change in the type of the workpiece 90 than the conventional press die equipped with a cam mechanism. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a press die having, for example, a knockout pin or a burring punch that operates in synchronization with a punch inside a forming hole into which a punch enters a die.

As a press mold, one having a knockout pin inside a molding hole formed in a die is known. When the punch pushes the work into the forming hole, the knockout pin moves to the inner part of the forming hole with the work sandwiched between the punch and the punch out when the punch retracts from the forming hole. It moves linearly in synchronism with the punch so as to push out from the forming hole. And in order to drive this knockout pin, the press metal mold | die provided with the hydraulic circuit (for example, refer patent document 1), and the press metal mold | die provided with the cam mechanism or link mechanism for interlocking a knockout pin with a punch The type is known.
Japanese Unexamined Patent Publication No. 7-155998 (paragraphs [0014] to [0016], [0018], FIG. 3)

  However, when a hydraulic circuit is provided as in the conventional press mold described above, the press mold becomes large, costly, and high-speed operation of the press machine becomes difficult. On the other hand, in the structure in which the knockout pin is simply connected to the cam mechanism or the link mechanism, when changing the operation timing of the knockout pin, it is necessary to change the camshaft and link provided in the press machine body, It was difficult to change. For this reason, it was not possible to easily cope with changes in the type of workpiece.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pressing die that can be manufactured at a lower cost and can easily cope with a change in the type of workpiece.

  In order to achieve the above object, a press die (20) according to the invention of claim 1 includes a punch (21) and a die (22) provided with a molding hole (23) into which the punch (21) enters. A piston rod (26) disposed on the opposite side of the molding hole (23) across the bottom wall (24) of the molding hole (23) and moving linearly in conjunction with the punch (21), and a molding hole (23 ) Is inserted into the shaft insertion holes (29A, 29B) and the shaft insertion holes (29A, 29B) formed through the bottom wall (24) of the metal plate, and is pushed by the punch (21) and the piston rod (26) to move linearly. Driven shaft members (40, 45), cross holes (33A, 33B) formed in the bottom wall (24) of the molding hole (23) and intersecting the shaft insertion holes (29A, 29B), and cross holes ( 33A, 33B) and an elastic member (36) accommodated inside, and a cross hole (33A) 33B) and is abutted from the side of the driven shaft member (40, 45) by the elastic force of the elastic member (36) from the side, and normally frictionally engages the driven shaft member (40, 45). When the driven shaft member (40, 45) receives an axial force from the punch (21) or the piston rod (26), the driven shaft member (40, 45) is provided with an abutting member (35) slidably contacting the driven shaft member (40, 45). It has the characteristics.

  According to a second aspect of the present invention, in the pressing die (20) according to the first aspect, the driven shaft member (45) sandwiches the work (90) between the punch (21) and the piston rod ( It is characterized in that it is a knockout pin (45) that receives the axial force from 26) and pushes the workpiece (90) out of the forming hole (23).

  According to a third aspect of the present invention, in the pressing die (20) according to the first aspect, the driven shaft member (40) enters the center hole (91) formed through the work (90), and the center thereof. It is characterized in that it is a burring punch (40) for raising the edge of the hole (91) into a cylindrical shape.

  According to a fourth aspect of the present invention, in the pressing die (20) according to the first aspect, the driven shaft member (40, 45) enters the center hole (91) formed through the work (90), A burring punch (40) for raising the edge of the central hole (91) into a cylindrical shape, and a plurality of knockout pins (45) arranged around the burring punch (40). (45) has one end fixed to an annular member (46) fitted to the outside of the burring punch (40), and sandwiches the workpiece (90) with the punch (21) via the annular member (46). At the same time, it is characterized in that it is configured to receive the axial force from the piston rod (26) and to push out the work (90) from the forming hole (23).

  According to a fifth aspect of the present invention, in the press mold (20) according to any one of the first to fourth aspects, the bottom wall (24) of the molding hole (23) is detachably assembled to the die (22). The cross wall (33A, 33B) is opened to the side surface of the bottom wall component (30A), and the screw member (33A, 33B) is opened into the cross hole (33A, 33B) from the open portion. 37) is screwed, and the abutting member (35) is characterized in that the elastic member (36) is disposed between the abutting member (35) and the screw member (37).

[Invention of Claim 1]
In the pressing mold (20) according to claim 1, when the punch (21) pushes the work (90) into the forming hole (23), the driven shaft member (40, 45) is pressed and the forming hole (23) is pressed. Move to the back. At this time, since the driven shaft member (40, 45) and the abutting member (35) are in sliding contact, the workpiece (90) is interposed between the punch (21) and the driven shaft member (40, 45) by the sliding contact resistance. The workpiece (90) is stably moved to the inner part of the forming hole (23). When the punch (21) is retracted from the forming hole (23), the driven shaft members (40, 45) are pushed back by the piston rod (26), and the work (90) is moved accordingly. It is extruded from the molding hole (23). In the present invention, the operation of the driven shaft member (40, 45) described above can be realized by a simple configuration of abutment between the driven shaft member (40, 45) and the abutting member (35). Cost reduction can be achieved as compared with a conventional press die using a hydraulic circuit. In addition, since the operation timing of the driven shaft member (40, 45) can be easily changed by changing the length of the driven shaft member (40, 45), the conventional mechanism having a cam mechanism or a link mechanism is provided. It is possible to easily cope with a change in the type of the work (90) from the press die.

[Invention of claim 2]
According to the pressing die (20) of the second aspect, the knockout pin (45) can be operated with a low-cost configuration, and its operation timing can be easily changed.

[Invention of claim 3]
According to the pressing die (20) of the third aspect, the burring punch (40) can be operated with a low-cost configuration, and its operation timing can be easily changed.

[Invention of claim 4]
According to the press die (20) of claim 4, the workpiece (90) is held between the annular member (46) fitted to the outside of the burring punch (40) and the punch (21). Since the workpiece (90) can be subjected to burring, the quality of the pressed product is stabilized.

[Invention of claim 5]
According to the pressing die (20) of claim 5, the screw member (37) is detached from the opening of the cross hole (33A, 33B) opened to the side surface of the bottom wall constituting member (30A), and abutting is performed. Maintenance of the member (35) and the elastic member (36) can be easily performed.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a pressing die 20 assembled in the press machine 10. The press machine 10 includes an upper base 11 and a lower base 12 that are vertically opposed to each other. Further, for example, a pair of camshafts (not shown) are provided above the upper base 11 and below the lower base 12, and the upper base 11 is connected to the camshaft disposed on the upper side, while the lower side A piston rod 26, which will be described later, is connected to the camshaft disposed in the. The two camshafts are driven using, for example, a motor (not shown) as a common drive source.

  The press die 20 includes a punch 21 fixed to the upper base 11 of the press machine 10 and a die 22 fixed to the lower base 12. The punch 21 has a structure in which a recess 21 </ b> A is formed to be recessed in the tip surface of the cylindrical body.

  The die 22 has a forming hole 23 into which the punch 21 enters. The inner portion of the molding hole 23 is closed by a bottom wall 24, and a piston rod 26 is accommodated in an internal space 25 formed on the opposite side of the molding hole 23 with the bottom wall 24 interposed therebetween. ing. In addition, a through hole 28 is formed in the back wall 27 facing the bottom wall 24 across the internal space 25, and the piston rod 26 is inserted into the through hole 28 and enters the internal space 25. A contact board 26B is provided at the tip of 26A. The lower end portion of the shaft body 26A is connected to the camshaft of the press machine 10 described above, whereby the piston rod 26 moves directly in conjunction with the punch 21.

  As shown in FIG. 1, the die 22 is formed by assembling a plurality of die constituent members 30A, 30B, 30C,..., And one die constituent member 30A is a “bottom wall constituent member according to the present invention. (Hereinafter, this die component 30A is referred to as "bottom wall component 30A"). Then, the bottom wall constituting member 30 </ b> A is disposed in the inner part of the molding hole 23 to constitute the bottom wall 24.

  As shown in FIG. 5, the bottom wall constituting member 30A has a flat cylindrical structure, and a portion of the bottom wall constituting member 30A exposed in the forming hole 23 (see FIG. 1) has a plurality of shaft insertion holes 29A. , 29B are formed. More specifically, a shaft insertion hole 29A having a relatively large inner diameter is formed at the center of the bottom wall 24, and a shaft insertion hole 29B having a relatively small inner diameter is formed at a position where the circumference thereof is equally distributed. . The burring punch 40 is inserted into the shaft insertion hole 29A formed at the center, and the knockout pin 45 is inserted into the shaft insertion hole 29B around the shaft insertion hole 29A.

  As shown in FIG. 1, the burring punch 40 has a shaft shape that can move directly in the shaft insertion hole 29A. Overhangs to the side. The stopper flange 42 can be linearly moved between a lower end position where the stopper flange 42 is in contact with the upper surface of the bottom wall 24 and an upper end position where the stopper cap 41 is in contact with the lower surface of the bottom wall 24. The bottom surface of the bottom wall 24 (bottom wall constituting member 30A) is formed with a recess 32 in which the stopper cap 41 is accommodated.

  Each of the plurality of knockout pins 45 has a shaft shape that can move linearly in the shaft insertion hole 29B, and an upper end portion of the knockout pins 45 is an annular pad 46 (corresponding to an “annular member” according to the present invention). It is fixed. The pad 46 is fitted to the upper end side of the stopper flange 42 in the burring punch 40, and can move linearly from the stopper flange 42 to the tip of the burring punch 40. A recess 47 in which the stopper flange 42 of the burring punch 40 is received is formed on the lower surface of the pad 46.

  As shown in FIG. 4, a plurality of cross holes 33A and 33B are formed in the bottom wall constituting member 30A so as to cross the shaft insertion holes 29A and 29B at right angles. Specifically, each of the cross holes 33A and 33B extends in the radial direction of the bottom wall constituting member 30A. The shaft insertion holes 29A for the burring punch 40 are provided with three cross holes 33A in a radial manner at intervals of 120 degrees, and one for each shaft insertion hole 29B for each knockout pin 45. A cross hole 33B is provided. Further, as shown in FIG. 5, the cross hole 33A for the burring punch 40 is disposed near the top surface of the bottom wall constituting member 30A, while the cross hole 33B for the knockout pin 45 is formed on the bottom surface of the bottom wall constituting member 30A. It is arranged at a close position.

  As shown in FIG. 4, each cross hole 33 </ b> A, 33 </ b> B has a female screw portion 34 formed therein. Then, as shown in FIG. 5, with the burring punch 40 and the knockout pin 45 inserted into the shaft insertion holes 29A and 29B, the abutting members 35 and the compression coil springs 36 (of the present invention) are inserted into the cross holes 33A and 33B. A set screw 37 (corresponding to “elastic member”) and a set screw 37 (corresponding to “screw member” of the present invention) are sequentially inserted, and the set screw 37 is screwed into the female screw portion 34. Thereby, the compression coil spring 36 is compressed and deformed, and the abutting member 35 is pressed against the burring punch 40 and the knockout pin 45 by its elastic force. Due to the frictional engagement between the abutting member 35 and the burring punch 40 and the knockout pin 45, the burring punch 40 and the knockout pin 45 do not move directly due to their own weight, but are held at a fixed position. Further, when pressed by the punch 21 or the piston rod 26, the burring punch 40 and the knockout pin 45 are brought into sliding contact with the abutting member 35 and moved in either the upper or lower direction.

Next, the operation of this embodiment will be described.
A workpiece 90 (see FIG. 1) to be pressed by the press 10 according to the present embodiment has a structure in which a donut-shaped disk is slightly bent to form a thin dish.
The press 10 stands by with the punch 21 positioned at the top dead center and spaced from the die 22. At this time, the piston rod 26 is also at the top dead center, and the burring punch 40 and the knockout pin 45 are pushed up to the upper end position by being pushed by the piston rod 26. As a result, as shown in FIG. 1, the upper surface of the pad 46 is substantially flush with the upper surface of the die 22, and the upper end of the burring punch 40 slightly protrudes from the upper surface of the pad 46. The workpiece 90 is set in a state of being inserted into the center hole 91.

  When the press machine 10 is started, for example, the piston rod 26 descends first. At this time, the burring punch 40 and the knockout pin 45 are held at the upper end position by frictional engagement with the abutting member 35. Next, when the punch 21 is lowered, the workpiece 90 is pushed by the punch 21 and pushed into the stepped portion near the tip of the burring punch 40 and the burring punch 40 is lowered. It is sandwiched between.

  In this state, the work 90 is pushed into the back side of the forming hole 23 and is squeezed between the inner peripheral surface of the forming hole 23 and the outer peripheral surface of the punch 21, so that the outer edge portion of the work 90 is formed into a cylindrical shape. The At this time, the knockout pin 45 and the burring punch 40 are also pushed and moved to the inner side of the molding hole 23, and the knockout pin 45 and the burring punch 40 and the abutting member 35 are in sliding contact. The workpiece 90 is stably held between the punch 21 and the pad 46 by the sliding resistance.

  When the punch 21 advances to the inner part of the forming hole 23, the stopper flange 42 of the burring punch 40 comes into contact with the bottom wall 24 in due time. And while the burring punch 40 is fixed, the work 90 is pushed into the inner part of the forming hole 23 (see FIG. 2). Thereby, the edge part of the center hole 91 of the workpiece | work 90 is pushed by the burring punch 40, and is shape | molded in the shape raised in the cylinder shape.

  When the punch 21 passes through the bottom dead center and rises, the piston rod 26 starts to rise slightly after the ascent timing. Then, the piston rod 26 first contacts the knockout pin 45 and the pad 46 pushes up the workpiece 90. As a result, the workpiece 90 is removed from the tip of the burring punch 40. Next, the piston rod 26 contacts the burring punch 40, and the burring punch 40 is also raised (see FIG. 3). Then, the piston rod 26 reaches top dead center, and one cycle of the press machine 10 is completed.

  By the way, when changing the kind of the workpiece | work 90 processed with this press machine 10, another press metal mold | die 20 is assembled | attached to the press machine 10. FIG. Thereby, the workpiece | work 90 of the shape corresponding to the novel die 20 for a press is shape | molded. Here, when the operation timing of the burring punch 40 and the knockout pin 45 with respect to the punch 21 is also changed according to the shape of the workpiece 90, for example, the camshafts for driving the piston rod 26 and the punch 21 are diverted, What is necessary is just to change the length of the burring punch 40 and the knockout pin 45 suitably.

  As described above, according to the press die 20 of the present embodiment, the operation of the burring punch 40 and the knockout pin 45 described above is a simple configuration in which the burring punch 40 and the knockout pin 45 are abutted against the abutting member 35. Therefore, the cost can be reduced as compared with a conventional press die using a hydraulic circuit. Further, since the operation timing of the burring punch 40 and the knockout pin 45 can be easily changed by changing the lengths of the burring punch 40 and the knockout pin 45, a conventional press equipped with a cam mechanism or a link mechanism. It is possible to easily cope with a change in the type of the workpiece 90 by using the mold. In addition, maintenance of the abutting member 35 and the compression coil spring 36 can be easily performed by detaching the set screw 37 from the opening of the cross holes 33A and 33B opened to the side surface of the bottom wall constituting member 30A.

[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) Although the burring punch 40 and the knockout pin 45 are provided in the pressing die 20 of the above embodiment, the present invention is applied to a pressing die provided with only the burring punch or only the knockout pin. Also good.

(2) In the press mold 20 of the above embodiment, the intersecting holes 33A and 33B are formed so as to intersect at right angles with the shaft insertion holes 29A and 29B. You may form so that it may cross | intersect 29B diagonally.

Side sectional view of a press die according to an embodiment of the present invention. Side cross-sectional view of press mold Side cross-sectional view of press mold Top view of bottom wall components Perspective view of bottom wall component

Explanation of symbols

20 Stamping die 21 Punch 22 Die 23 Molding hole 24 Bottom wall 26 Piston rod 29A, 29B Shaft insertion hole 30A Bottom wall component member 33A, 33B Cross hole 35 Abutting member 36 Compression coil spring (elastic member)
37 Set screw (screw member)
40 Burring punch 45 Knockout pin 46 Pad (annular member)
90 Workpiece 91 Center hole

Claims (5)

Punch (21),
A die (22) having a forming hole (23) into which the punch (21) enters;
A piston rod (26) disposed on the opposite side of the molding hole (23) across the bottom wall (24) of the molding hole (23) and moving linearly in conjunction with the punch (21);
The shaft insertion holes (29A, 29B) formed through the bottom wall (24) of the molding hole (23), the shaft insertion holes (29A, 29B), the punch (21) and the piston rod ( 26) a driven shaft member (40, 45) which is pushed by 26) and moves directly;
Cross holes (33A, 33B) formed in the bottom wall (24) of the molding hole (23) and intersecting the shaft insertion holes (29A, 29B);
An elastic member (36) housed inside the cross hole (33A, 33B);
It is accommodated in the cross hole (33A, 33B), and is abutted from the side of the driven shaft member (40, 45) by the elastic force of the elastic member (36). Usually, the driven shaft member ( 40, 45) and when the driven shaft member (40, 45) receives an axial force from the punch (21) or the piston rod (26), the driven shaft member (40, 45) A pressing die (20), comprising: an abutting member (35) in sliding contact.   The driven shaft member (45) sandwiches the workpiece (90) between the punch (21) and receives an axial force from the piston rod (26), so that the workpiece (90) is inserted into the molding hole ( 23. A press die (20) according to claim 1, characterized in that it is a knockout pin (45) extruded from 23).   The driven shaft member (40) is a burring punch (40) for projecting into a center hole (91) formed through the work (90) and projecting the edge of the center hole (91) into a cylindrical shape. The press die (20) according to claim 1, wherein the press die (20) is provided. The driven shaft member (40, 45) enters a center hole (91) formed through the work (90), and a burring punch (40) for raising the edge of the center hole (91) into a cylindrical shape. ) And a plurality of knockout pins (45) disposed around the burring punch (40),
One end of each of the plurality of knockout pins (45) is fixed to an annular member (46) fitted to the outside of the burring punch (40), and the plurality of knockout pins (45) are connected to the punch (21) via the annular member (46). The work (90) is sandwiched therebetween, and the work (90) is pushed out from the forming hole (23) by receiving an axial force from the piston rod (26). The press die (20) according to 1. The bottom wall (24) of the molding hole (23) is constituted by a bottom wall constituting member (30A) removably assembled to the die (22),
The cross hole (33A, 33B) is opened to the side surface of the die component member (30A), and the screw member (37) is screwed into the cross hole (33A, 33B) from the open portion,
The press member according to any one of claims 1 to 4, wherein the abutting member (35) is disposed so as to sandwich the elastic member (36) between the abutting member (35) and the screw member (37). Mold (20).

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