Punch press die

A punch press tool includes a cylindrical punch guide in which a punch body provided with a punch tip for press forming is fit slidably. The punch tip consists of an appropriate number of long forming punch tips each including a press forming portion in the leading end thereof. The punch tip also consists of an appropriate number of clamping punch tips each with a shorter length compared with the forming punch tips. Both of the tips are attached to the punch body detachably and exchangeably.

This application is a 371 of PCT/JP03/07504, filed Jun. 12, 2003.

TECHNICAL FIELD

The present invention relates to a punch press tool that is used for forming a workpiece precisely, which is to be used for, for example, electronic parts, through a process consisting of upward or downward cut-and-raising and bending.

BACKGROUND ART

Conventionally, in order to form a bent part through, for example, a downward or upward cut-and-raising and bending process being performed on a portion of a workpiece that is to be used for, for example, electronic parts, a punch tool or die tool is made corresponding to the width of the bent part, and such tools are exchanged to be used for different widths.

However, using the individual tools discussed above causes a problem that it is necessary to make and prepare a large number of tools corresponding to various widths of respective bent parts. Moreover, there is another problem that the width of each of the bent parts cannot be designed freely.

The present invention is intended to solve the problems described above, and an object of the invention is to provide a punch press tool that is capable of forming a bent part with a freely-designed width by downward or upward cut-and-raising and bending.

DISCLOSURE OF THE INVENTION

In order to achieve the above object, a punch press tool according to a first aspect of the present invention comprises: a cylindrical punch guide; a punch body fitted slidably within the aforesaid punch guide; and a punch tip to perform press forming; wherein the aforesaid punch tip includes an appropriate number of long forming punch tips each including a press forming portion in the leading portion thereof and an appropriate number of clamping punch tip each having a shorter length compared with the forming punch tips; and both of the aforesaid tips are attached to the aforesaid punch body detachably and exchangeably.

A punch press tool according to a second aspect of the present invention is a punch press tool of the first aspect in which at least either the aforesaid forming punch tips and the aforesaid clamping punch tips are split into a plurality.

A punch press tool according to a third aspect of the present invention is a punch press tool according to the first or the second aspect in which provided is a stripper having a guide hole for receiving and guiding both of the aforesaid tips in the leading end side of the aforesaid punch guide and provided is a projected portion for clamping a workpiece in a position adjacent to the aforesaid guide hole located in the leading end of the aforesaid stripper.

A punch press tool according to a fourth aspect of the present invention comprises: a die base; a die body supported on the aforesaid die base; and a die tip held in the aforesaid die body; wherein the aforesaid die tip comprises an appropriate number of forming die tips each including a forming portion in the leading end thereof and an appropriate number of sub die tips each having a smaller size compared with the forming die tips; and both of the aforesaid tips are attached to the aforesaid die body detachably and exchangeably.

A punch press tool according to a fifth aspect of the present invention is a punch press tool according to the fourth aspect in which at least either the aforesaid forming die tips or the sub die tips are split into a plurality.

A punch press tool according to a sixth aspect of the present invention comprises: a punch holder for the punch press; a sliding body supported slidably within the aforesaid punch holder; and a punch tip for performing press forming, which punch tip is attached to the leading end of the aforesaid sliding body; wherein the aforesaid punch tip includes an appropriate number of long forming punch tips each including a press forming portion in the leading end thereof and an appropriate number of clamping punch tips each having a shorter length compared with the forming punch tips; and the aforesaid forming punch tips and the aforesaid clamping punch tip are attached to the aforesaid sliding body detachably and exchangeably.

A punch press tool according to a seventh aspect of the present invention is a punch press tool according to the sixth aspect in which at least either the aforesaid forming punch tips or the aforesaid clamping punch tips are split into a plurality.

Thus, by means of combining appropriately the aforesaid forming punch tips, the aforesaid clamping punch tips, the aforesaid forming die tips and the aforesaid sub die tips, a downward or upward cut-and-raised and bent part can be formed in a portion of a workpiece.

In addition, by means of selecting the width for each of the aforesaid tips, the width and the spacing of a bent part can be selected freely, and the punch tips and the die tips can be exchanged for forming various bent parts having various bent width.

Furthermore, when forming into a downward cut-and-raised and bent part in a workpiece, the workpiece can be clamped between the projected portion provided in the leading end of the stripper and the clamping punch tip, so that a bent part can be obtained with high accuracy.

THE BEST MODE FOR CARRYING OUT THE INVENTION

Hereunder, the best mode of carrying out the present invention will be described in detail referring to the attached drawings.

FIG. 1shows a punch press tool1of high precision according to the present invention. This punch press tool1is constructed of a punch tool3and a die tool5. In the aforesaid punch tool3, a punch guide9is provided to be slidable upward and downward within a hole7H formed in a upper die supporting member7that serves as a punch holder. Within the punch guide9, supported slidably upward and downward (upward and downward inFIG. 1) are a punch tip11, a punch body13provided detachably on the upper side of the punch tip11and a punch driver17connected integrally to the punch body13by means of a threaded portion15.

There is provided a flange portion19on the upper end of the aforesaid punch guide9. This flange portion19includes a locking groove39formed on a circumference surface thereof, and an O ring21as a locking member is inserted into the locking groove39. The aforesaid punch driver17consists of a middle portion23with an outer diameter d and a lower portion25with an outer diameter25, in which the outer diameter d is adapted to be smaller than the outer diameter D. And a retainer collar27having an inner diameter smaller than the outer diameter D of the lower portion25is provided slidably upward and downward outside the middle portion23. Accordingly, the retainer collar27is slidable along only the middle portion23of the punch driver17. Further, a punch head29is mounted on the upper end of the punch driver17.

Between the retainer collar27and the punch head29, a resiliently stripping member such as a stripper spring31is provided for constantly biasing the retainer collar27and punch head29to press them apart.

Surrounding the peripheries of the retainer collar27and the stripper spring31, a slide collar33that servers as a fixing member is disposed slidably. On the internal surface of the lower end of the slide collar33, a locking projection37is formed. This locking projection37serves to press downward a clamping projection35formed in the lower end of the retainer collar27so as to allow the lower end of the slide collar33to engage lockably the O-ring21disposed in the flange portion19of the punch guide9. Between the flange portion19of the aforesaid punch guide9and the upper surface of the upper die supporting member7, a lifter spring20is disposed for biasing upward the punch guide9constantly.

Referring toFIG. 2Atogether withFIG. 2B,FIG. 3AandFIG. 3B, the aforesaid punch tip11comprises an appropriate number of forming punch tips41each of which includes a press forming portion in the leading end portion thereof and has a length L1 and an appropriate number of clamping punch tips43each of which has a shorter length L2 compared with that of the forming punch tip41(L2<L1). Both tips41and43are received in the aforesaid punch body13detachably.

FIG. 2AandFIG. 2Bshow the forming punch tip41. Referring toFIG. 2A, the head portion41B has projections41D in the bottom thereof, which projections project toward right and left with respect to the body portion41C so as to make a step in the vertical direction.FIG. 3AandFIG. 3Bshow the aforesaid clamping punch tip43. Referring toFIG. 3A, in the similar manner to the forming punch tip, the head portion43B has projections43D in the bottom thereof, which projections project toward right and left with respect to the body portion43C so as to make a step in the vertical direction.

The aforesaid forming punch tips41are prepared preliminarily with various widths T such as the width T1for one piece and the width 2T1for two pieces. Also, the aforesaid clamping punch tips43are prepared preliminarily with various widths T such as the width T1for two pieces, the width 1.5T1for two pieces and the width 2T1for one piece.

Referring also toFIG. 4andFIG. 5, in the leading end portion13A of the aforesaid punch body13, a punch receiving recess45including an opening13C is formed in the leading end surface13B. Further, in the leading end portion13A of the punch body13, locking recesses47including openings47A formed on the periphery surfaces thereof and communicating with the aforesaid punch receiving recess45are formed. A locking piece49is provided with an engaging surface49A in an inner side thereof, which is adapted to be engageable with a peripheral surface of the punch tip11attached inside the aforesaid punch receiving recess45. The locking piece49is disposed detachably in one of the aforesaid locking recesses47, and the paired locking piece is disposed in the other locking recess located oppositely to the foregoing locking recess. The engaging surface49A of the aforesaid locking piece49is formed with the shape corresponding to a shape of the outer periphery of the punch tip11.

The forming punch tip41and the clamping punch tip43, both of which compose the aforesaid punch tip11, are provided with the projections41D and43D respectively on the respective head portions41B and43B thereof, which projections project horizontally with respect to the aforesaid locking recess47and are engageable with the engaging surface49A of the aforesaid locking piece49. Moreover, the aforesaid punch body13is provided with a key53in the peripheral surface thereof, and this key53is received in a key groove9A that is formed on the punch guide9.

At the leading end (lower end) of the aforesaid punch guide9, a cross-shaped plate55is fitted, and inside this plate55a cross-shaped plate57is fixed by means of a bolt or the like. Referring also toFIG. 6AandFIG. 6B, at the center of this plate57a stripper59is disposed, which stripper is formed with a guide hole59H for receiving and guiding the aforesaid punch tip11composed of the forming punch tips41and the clamping punch tips43. On the leading end of this stripper59, a projected portion59T is disposed adjacent to the aforesaid guide hole59H, which projected portion serves for clamping the work sheet.

The aforesaid die tool5is, as shown inFIG. 1, mounted within a mounting hole61H disposed in the lower die supporting member61, and a die body67is supported on a die base63via a die holder65and fastened by means of a bolt69. Within respective holes71and73that are formed in the center of the aforesaid die holder65and the die body67respectively, a die tip75is held detachably. The aforesaid die tip75comprises an appropriate number of the forming die tips77, which have a size L3, having a forming portion77A as shown inFIG. 7AandFIG. 7Bas well as an appropriate number of the sub die tips79, which have a size L4 smaller than L3 (L4<L3), as shown inFIG. 8AandFIG. 8B. Such tips, i.e., the forming die tips77and the sub die tips79are disposed detachably and exchangeably in the aforesaid die body67.

The aforesaid forming die tips77are prepared preliminarily with various widths T such as width T1for one piece and width 2T1for two pieces. Also, the aforesaid sub die tips79are prepared preliminarily with various widths such as width T1for two pieces, width 1.5T1for two pieces and width 2T1for one piece.

According to the construction described above, as shown inFIG. 5, the appropriate number of forming punch tips41and the appropriate number of clamping punch tips43are bound together to form the punch tip11. Such bound tips are inserted from the right in the figure into an opening formed in the leading end surface of the punch receiving recess45that is disposed in the leading end portion13A of the punch body13. And, when a pair of the locking pieces49are mounted within the locking recess47, which is formed in such a manner that the openings47A formed on the peripheral surface of the leading end portion13A of the aforesaid punch body13communicate with the aforesaid punch receiving recess45, the engaging surface49formed in the inner side of the locking piece49comes to engage the peripheral surface of the punch tip11. The punch body13including the punch tip11is accommodated in the hole9H formed in the punch guide9, which is shown inFIG. 1.

As shown inFIG. 1, when the top of the punch head29is struck by means of a striker that is not shown, the punch guide9moves downward against the bias of the lifter spring20. While the punch guide9moves downward further, the lower surface of the projected portion59T of the stripper59and the upper surface of the forming die tip77hold the workpiece cooperatively, and the forming die tip77performs to cut-and-raise and to bend downward for forming a bent part.

By way of example, as shown inFIG. 9A, one piece of the forming punch tip41with the width T1, two pieces of the clamping punch tips43with the width T1and one piece of the clamping punch tip43with the width T2, and one piece of the forming die tip77with the width T1, two pieces of the sub die tips79with the width T1, two pieces of the sub die tips79with the width 1.5T1and two pieces of the sub die tips79with the width 2T1are combined together into two sets. And when such combinations are used for bending a workpiece downward, a downward cut-and-raised and bent part can be obtained as shown inFIG. 9B.

Alternatively, as shown inFIG. 10Aby way of example, one piece of the forming punch tip41with the width T1, one piece of the forming punch tip41with the width 2T1and one piece of the clamping punch tip43with the width 21T, and one piece of the forming die tip77with the width T1, one piece of the forming die tip77with the width 2T1, two pieces of the sub die tips79with the width T1, two pieces of the sub die tips79with the width 1.5T1and one piece of the sub die tip79with the width 2T1are combined together into two sets. And when such combinations are used for bending a workpiece downward, a downward cut-and-raised and bent part can be obtained as shown inFIG. 10B.

Furthermore, by making use of the forming punch tip41, the clamping punch tip43, the forming die tip77and the sub die tip79, and by making various combinations through varying the width and the number of these tips, various bent parts that have bent widths other than discussed above and appropriate spacing can be obtained.

FIG. 11shows a punch tool81, which is an alternative to the same shown inFIG. 1, for a high precision punch press according to another embodiment of the present invention. InFIG. 11, it is shown that the punch tool81of a punch press comprises a punch tool83and a die tool85.

In the aforesaid punch tool83, there is included an upper die supporting member87as a punch holder, which member is provided with a hole87H. A punch body89as a sliding body is accommodated in this hole slidably upward and downward. On the top of the punch body89, a punch head is mounted. Between a lower surface of the punch head91and an upper surface of the aforesaid upper die supporting member87, there is interposed a lifter spring93that biases the punch body89upward normally.

In the leading end (lower end) of the aforesaid punch body89, a cross-shaped plate95is fitted, and another cross-shaped plate97is fixed to the forgoing plate95by means of a bolt or the like. Furthermore, a punch tip99is inserted into the center portion of the aforesaid plate95.

The punch tip99comprises, referring toFIG. 12Atogether withFIG. 12B,FIG. 13AandFIG. 13B, an appropriate number of forming punch tips101, each of which is provided with a press forming portion101A in the leading end thereof and has a long size L5, and an appropriate number of clamping punch tips103, each of which has a size L6 (L6<L5) shorter than that of the forming punch tip101. Both of the aforesaid tips101and103are attached to the aforesaid punch body89exchangeably.

The aforesaid forming punch tips101are prepared preliminarily with various widths such as the width T1for one piece, width 2T1for two pieces and the width T3for one piece. Also, the aforesaid clamping punch tips103are prepared preliminarily with various widths such as the width T1for two pieces, the width 1.5T1for two pieces and the width 2T1for one piece.

The aforesaid die tool85is, as shown inFIG. 11, accommodated in a mounting hole105H disposed in a lower die supporting member105, and a die holder109is fixed on a die base107by means of a bolt111. On the die holder109, an ejector plate113is mounted, and this ejector plate113is biased against the die holder109upward normally by means of a spring115.

Within holes117and119formed in the center of each of the aforesaid die holder109and the ejector plate113, the die tip121is held detachably. The aforesaid die tip121comprises, as shown inFIG. 14AandFIG. 14B, an appropriate number of die tips123, each of which is provided with a forming portion123A in the leading end (upper end) thereof and has a size L7, and an appropriate number of sub die tips125each having a size L8 smaller than L7 (L8<L7). A combination of both of the forming die tips123and the sub die tips125is attached to the aforesaid die holder109detachably and exchangeably.

The aforesaid forming die tips123are prepared preliminarily with various widths T such as the width T1for one piece, the width 2T1for two pieces and the width T3for one piece. Also, the aforesaid sub die tips125are prepared preliminarily with various widths T such as the width T1for two pieces, the width 1.5T1for two piece and the width 2T1for one piece.

According to the construction described above, as shown inFIG. 11, when the leading end of the punch head91is struck with a striker that is not shown, the punch body89moves downward against the biasing force from the lifter spring93. While the punch body89moves downward further, the lower surface of the forming punch101presses the upper surface of the aforesaid ejector plate113against the biasing force from the spring115and the upper surface of the forming die tip123presses upward the workpiece, so that an upward cut-and-raised part can be obtained.

By way of example, as shown inFIG. 16A, one piece of the forming punch tip101with the width T1, two pieces of the clamping punch tips103with the width T1two pieces of the clamping punch tips103with the width 1.5T1and one piece of the clamping punch tip103with the width T2and one piece of the forming die tip123with the width T1two pieces of the sub die tips125with the width T1two pieces of the sub die tips125with the width 1.5T1and one piece of the sub die tip125with the width 2T1are combined together into two sets. When performing an upward cut-and-raising and bending on a workpiece W by means of these sets, an upward cut-and-raised and bet part shown inFIG. 16Bcan be obtained.

Alternatively, as shown inFIG. 17A, two pieces of the forming punch tips101with the width 2T1two pieces of the clamping punch tips103with the width T1and one piece of the forming punch tip101with the width 2T1and two pieces of the forming die tips123with the width 2T1two pieces of the sub die tips125with the width T1and one piece of the sub die tip125with the width 2T1are combined together into two sets. When performing an upward cut-and-raising and bending on a workpiece W by means of these sets, an upward cut-and-raised and bent part shown inFIG. 17Bcan be obtained.

Furthermore, by making use of the forming punch tips101, the clamping punch tips103, the forming die tips123and the sub die tips125and by making various combinations through varying the width and the number of these tips, various bent parts which have bent widths other than discussed above and appropriate spacing can be obtained.

It should be noted that all of the substances of the Japan Patent Application No. 2002-172740 filed on Jun. 13, 2002 be incorporated in this specification by a reference.

Furthermore, the present invention should not be limited by the embodiment of the present invention described above, and other embodiments may be executed by providing appropriate changes to the present invention.