JP6621433B2 - Press machine and press machine modification set - Google Patents

Description

  The present invention relates to a press machine in which a plurality of punches arranged in a row move up and down together with a ram and process a workpiece in cooperation with a plurality of dies, and a press machine remodeling set for remodeling such a press machine .

  Conventionally, a transfer press is known as an example of this type of press (see, for example, Patent Document 1). Some transfer presses are provided with an adjustment mechanism for adjusting the fixing position of each punch with respect to the ram in the vertical direction. With this adjustment mechanism, it is possible to cope with a difference in height between workpieces processed at a time with a plurality of punches.

JP 2003-71524 A (FIG. 1)

  However, the above-described conventional press machine cannot cope with the case where the heights of workpieces are greatly different. In such a case, a plurality of press machines having different strokes are used. However, if it does so, the problem that an installation cost becomes high will arise.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a press machine and a press machine modification set capable of forming a plurality of workpieces having greatly different heights at a time.

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a plurality of punches attached in a row to a ram and a plurality of dies opposed to the punches from below are arranged from one end of a plurality of processing stages. In a press machine in which workpieces are sequentially conveyed to the end and drawn , a plurality of ram lower end blocks projecting forward from the front lower edge of the ram, and a plurality of the ram lower end blocks are formed side by side. A plurality of vertical groove portions that receive the upper portion, and a portion of the plurality of vertical groove portions that are disposed in or above the vertical groove portion on the end side in the workpiece conveyance direction, and a portion of the plurality of punches a punch guide for linear motion supporting the as a special punch, the upper part of the ordinary punch excluding the special punch of said plurality of punches, the longitudinal groove of said portion of said plurality of longitudinal grooves A fixing member for retaining in the remaining plurality of said longitudinal grooves except the mounted on the ram has a servo motor as a driving source, relative to the ram in synchronism with the special punch to the ram of the linear operation and additional driving mechanism for vertically moving a press machine is provided.

The invention of claim 2 is characterized in that the additional drive mechanism arranges the special punch at or near the bottom dead center with respect to the ram when the machining load from the workpiece to the special punch is the largest. when the ram is raised, a press according to claim 1 to increase the special punch to the ram.

The invention of claim 3, wherein the additional drive mechanism, the elastic member for urging the special punch upwardly, is rotated in front Symbol servo motor, a rotating cam depressing the special punch, is provided The press according to claim 1 or 2 .

According to a fourth aspect of the present invention, a plurality of vertical groove portions are formed in a row in the ram lower end block protruding forward from the lower front edge portion of the ram , and an upper portion of the punch is fixed in the plurality of vertical groove portions by a fixing member. At the same time, the workpiece is sequentially conveyed from one end to the other end of a plurality of processing stages composed of these punches and a plurality of dies opposed to them from below, and assembled into the ram of the press machine that is drawn. A press machine remodeling set, which is disposed in or above a part of the plurality of vertical groove portions on the terminal end side in the workpiece conveyance direction, and a part of the plurality of punches is a punch guide vertically movably supported as a special punch, said mounted on the ram has a servo motor as a driving source, the synchronization of the special punch to the ram of the linear operating ram A pressing machine modified set comprising an additional drive mechanism for vertically moving against.

The invention of claim 5, wherein the additional drive mechanism, and an elastic member for biasing the special punch upwardly, the rotational driving in front Symbol servo motor, a rotating cam depressing the special punch, is provided The press machine modification set according to claim 4 .

[Inventions of Claims 1 and 3 ]
As in the press machine according to the first aspect, when the drawing is performed by sequentially conveying to a plurality of machining stages, the height of the workpiece increases toward the end side in the conveying direction. On the other hand, in the press machine according to the first aspect, since the special punch is arranged on the terminal end side in the workpiece conveyance direction and the stroke of the punch is long, it is possible to easily cope with the increase in the height of the workpiece by drawing. Can do. Thus, it is possible to mold the height significantly different workpieces lower cost to use multiple press at a time. In addition, since the vertical groove portion of the ram for fixing the normal punch is also used for assembling the special punch, the manufacturing cost or the modification cost of the press machine can be suppressed. Furthermore, any of special punches and normal punches can be arbitrarily selected and attached to the plurality of vertical grooves, and it becomes possible to cope with various shapes of workpieces. Furthermore, the servomotor can easily synchronize the ram linear motion and the special punch linear motion. In addition to the ball screw mechanism, the rack and pinion mechanism, and the crank lever mechanism, the mechanism for converting the rotation of the servo motor into the direct movement of the special punch includes a rotating cam as in the invention of claim 3. Mechanism.

[Invention of claim 2 ]
In the press machine according to claim 2 , since the special punch is disposed at or near the bottom dead center with respect to the ram when the processing load from the workpiece to the special punch becomes the largest, the special punch mainly lowers the ram. Machining the workpiece with only the driving force Thereby, it is not necessary to increase the driving force of the additional drive mechanism, and the additional drive mechanism can be reduced in size and weight.

[Inventions of Claims 4 and 5 ]
By using the press machine modification set according to claims 4 and 5 , the conventional press machine can be easily and inexpensively modified to the press machine according to the present invention.

The front view of the press which concerns on one Embodiment of this invention. Ram cross section Cross section of the ram Front view of ram Ram cross section Side sectional view when the special punch is located at the top dead center with respect to the ram Side sectional view when the special punch is located at the bottom dead center with respect to the ram Top view of lifting plate

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The support frame 11 of the press machine 10 of the present embodiment has a lower end bridging portion 13, an intermediate bridging portion 14 and an upper end bridging portion 15 between a pair of side walls 12 and 12 rising from a floor surface of a factory or the like. It has a structure with a rear wall (not shown) on the rear surface.

  A recess 13A is formed on the upper surface of the intermediate cross-linking portion 14, and a plurality of dies 17 are arranged and fixed in a row there. Each die 17 is provided with a molding hole (not shown) opened on the upper surface. When the whole of the plurality of dies 17 is viewed from above, the plurality of molding holes are arranged in a straight line at equal intervals. In addition, a transfer device 18 having a known structure disclosed in, for example, Japanese Patent Application Laid-Open No. 2006-203212 is provided on the upper surface of the intermediate bridge portion 14. A plurality of machining stages S are constituted by a plurality of dies 17 and a plurality of punches (30, 32) to be described later, and workpieces are sequentially conveyed from the left machining stage S to the right machining stage S by the transfer device 18. And drawing.

  A dovetail groove (not shown) extending in the vertical direction is formed on the front surface of the rear wall and the inner surfaces of the side walls 12 and 12. And the engagement protrusion formed in the ram 20 is slidably engaged with these dovetail grooves, and the ram 20 is supported so as to be linearly movable in the vertical direction.

  A cam drive shaft (not shown) is passed to a position near the upper end of the pair of side walls 12, 12 and penetrates the position near the upper end of the ram 20. A pair of cams provided on the cam drive shaft is sandwiched from above and below by a pair of rollers rotatably supported by the ram 20. Thereby, when the camshaft is driven to rotate, the ram 20 moves up and down. A main servo motor (not shown) is provided as a rotational drive source for the camshaft.

  As shown in FIG. 2, the ram 20 includes a ram lower end block 21 that protrudes forward from the lower edge of the front surface. Specifically, the punch support member 20B is fixed to the lower end portion of the ram main body 20H, and a part of the punch support member 20B protrudes from the front surface of the ram main body 20H to form the ram lower end block 21 described above. Further, a step surface 21D is formed on the front surface of the ram lower end block 21 at an intermediate position in the vertical direction, and the upper side of the step surface 21D protrudes forward.

  As shown in FIG. 1, a plurality of vertical groove portions 22 are arranged in a horizontal row at equal intervals in a portion below the step surface 21 </ b> D in the ram lower end block 21. The vertical groove 22 has a quadrangular cross section. In addition, a pair of plate fixing screw holes 22N are provided vertically on both sides of the vertical groove portion 22 in the ram lower end block 21. Further, as shown in FIG. 3, the ram lower end block 21 is formed with a plurality of adjustment screw holes 23 penetrating the upper portion from the step surface 21 </ b> D (see FIG. 4) in the vertical direction and communicating with the vertical groove portion 22. ing. Further, a screw hole 23N (see FIG. 4) is formed in an intermediate portion of each adjustment screw hole 23 so as to communicate with the front surface of the ram lower end block 21.

  A punch 30 is fixed to the other vertical groove portions 22 excluding the second and third vertical groove portions 22 from the end in the workpiece conveyance direction among the plurality of vertical groove portions 22. Hereinafter, the punch 30 fixed to the longitudinal groove portion 22 is referred to as a “normal punch 30”.

  As shown in FIG. 3, the normal punch 30 has, for example, a bar shape extending in the vertical direction, and includes a disk-shaped head portion 30H at the upper end. A punch holder 31 is fitted in the longitudinal groove portion 22 to which the normal punch 30 is attached. The punch holder 31 has a vertically long rectangular parallelepiped shape, and a through hole 31 </ b> A penetrates the center portion vertically. Then, the punch holder 31 is fitted in the longitudinal groove portion 22 in a state where the normal punch 30 is inserted into the through hole 31 </ b> A and the head portion 30 </ b> H is superimposed on the upper surface of the punch holder 31.

  Further, an adjusting screw 24 is screwed into an adjusting screw hole 23 on the vertical groove portion 22 to which the normal punch 30 is attached. The normal punch 30 is positioned in the vertical direction with respect to the ram 20 by bringing the lower end portion of the adjustment screw 24 protruding into the longitudinal groove portion 22 into contact with the head portion 30H. A head portion 24H having a hexagonal cross section is provided at the upper end portion of the adjustment screw 24 protruding upward from the adjustment screw hole 23, and can be rotated by engaging a tool therewith. Further, the adjusting screw 24 is prevented from rotating by screwing a set screw into the screw hole 23N and pressing the adjusting screw 24 from the side.

  The punch holder 31 slightly protrudes from the front surface of the ram lower end block 21 while being fitted in the vertical groove portion 22. Then, as shown in FIG. 4, the presser plate 25 is disposed so as to obliquely cross the front surface of the punch holder 31, and the bolts passed through the through holes formed at both ends of the presser plate 25 are screw holes 22N for fixing the plate. It is tightened to. Thus, the normal punch 30 is fixed to the ram 20. The pressing plate 25 and the punch holder 31 correspond to a “punch fixing portion” according to the present invention.

  As shown in FIG. 3, punches 32 (hereinafter referred to as “special punches 32”) are supported so as to be linearly movable in the second and third vertical groove portions 22 from the end in the workpiece conveyance direction. In addition, an adjustment sleeve 27 is attached to the adjustment screw hole 23 communicating with the longitudinal groove portion 22 instead of the adjustment screw 24 described above.

  As shown in FIG. 6, the adjustment sleeve 27 has a structure having a male screw portion on the outer surface of the pipe, is screwed into the adjustment screw hole 23, and protrudes above and below the adjustment screw hole 23. . As shown in FIG. 4, a plurality of engagement holes 27A are formed in the upper end portion of the adjustment sleeve 27 in the circumferential direction, and the tool can be rotated by being engaged with the arbitrary engagement holes 27A. . In addition, a set screw is screwed into the screw hole 23N and pressed against the adjustment sleeve 27 from the side, whereby the adjustment sleeve 27 is prevented from rotating.

  As shown in FIG. 6, the special punch 32 is formed by connecting an extension rod 34 to the upper end portion of the punch body 33. The extension rod 34 includes a columnar connecting portion 35 at a lower end portion of a rod main body 34H extending in the vertical direction. In addition, a press-fit hole 35 </ b> A that opens to the lower surface is formed in the center of the connecting portion 35. On the other hand, the punch body 33 has a round bar shape and the outer diameter of the upper end portion is large. And the upper end part of the punch main body 33 is press-fitted into the press-fitting hole 35A of the connecting part 35, and the punch main body 33 and the extension rod 34 are integrated. A central hole 32A is formed in the axial center portion of the special punch 32 throughout.

  The connecting portion 35 is accommodated in the punch guide 26. The punch guide 26 has a circular hole 26A having a prismatic shape and penetrating vertically, and a connecting portion 35 of the special punch 32 is accommodated in the circular hole 26A so as to be linearly movable. Further, a lower surface cover 28 is overlapped and screwed to the lower surface of the punch guide 26, and the punch body 33 of the special punch 32 passes through a through hole 28 </ b> A formed through the lower surface cover 28. Furthermore, an upper surface lid 29 is screwed onto the upper surface of the punch guide 26, and the rod body 34H of the extension rod 34 passes through a through hole 29A formed through the upper surface lid 29. A bush 29B made of a sliding member is fitted and fixed inside the through hole 29A.

  A key groove 26M extending in the lateral direction is formed on the front surface of the punch guide 26, and an intermediate portion thereof communicates with the circular hole 26A. Also, counterbore holes (not shown) are formed at both ends of the key 26K accommodated in the key groove 26M, and a pair of screw holes (not shown) corresponding to the counterbore holes are formed in the punch guide 26. The key 26K is screwed to the punch guide 26 by a screw passed through the counterbore hole and protrudes into the circular hole 26A. Correspondingly, a flat surface 35F is formed in a part of the connecting portion 35 in the circumferential direction from the lower end to the upper end position, and a locking projection 35T is provided on the upper side of the flat surface 35F. . When the connecting portion 35 moves linearly in the punch guide 26 and moves downward, the locking projection 35T and the key 26K come into contact with each other, and the connecting portion 35 is prevented from moving further downward. The key 26K is disposed at a position slightly retracted from the outer surface of the punch guide 26.

  A screw portion is formed on the outer peripheral surface of the upper portion of the extension rod 34, and a pair of nuts 36, 36 are screwed into the screw portion. Further, a compression coil spring 37 (corresponding to the “elastic member” of the present invention) inserted outside the rod body 34H is sandwiched between the nut 36 and the upper surface lid 29, and the special punch 32 is attached upward. It is fast.

  The above-described special punch 32, punch guide 26, bottom cover 28, top cover 29, bush 29B, compression coil spring 37, and nut 36 are assembled into a punch unit 32U. Then, the rod main body 34H and the compression coil spring 37 of the punch unit 32U are inserted into the adjustment sleeve 27 from below, and the punch guide 26 is assembled in a state of being accommodated in the longitudinal groove portion 22. Then, the lower end portion of the adjustment sleeve 27 is brought into contact with the upper surface lid 29, and the punch guide 26 is fixed to the ram lower end block 21 by the presser plate 25 as in the case of the punch holder 31.

  As shown in FIG. 4, the ram 20 is provided with a servo motor 50 and a cam mechanism 89 that converts the rotation output into a direct motion of the special punch 32. The servo motor 50, the cam mechanism 89, and the compression coil spring 37 described above constitute an additional drive mechanism 89K according to the present invention.

  The cam mechanism 89 has a support frame 51 fixed to the ram 20, and the support frame 51 has a structure including a pair of side walls 54 and 54 at both ends of a base portion 52 extending in the lateral direction. . Further, as shown in FIG. 5, a fixing plate 53 is overlapped and fixed on the upper surface of the base portion 52 and projects rearward from the base portion 52. Further, a protrusion 52T protrudes from the lower edge portion on the rear surface of the fixed base 52, and a space between the protrusion 52T and the fixing plate 53 is a square groove 52M. Then, an upper portion of the ram lower end block 21 above the step surface 21D is received by the corner groove portion 52M, and a lower inner side surface of the corner groove portion 52M is in surface contact with the step surface 21D. Further, the fixed base 52 has a plurality of through holes penetrating in the front-rear direction, and bolts B passed through the through holes are fastened to a plurality of screw holes 21N additionally formed in the ram lower end block 21. .

  The fixed plate 53 faces the upper surface of the ram lower end block 21 with a gap. The aforementioned adjustment sleeves 27, 27 are inserted into the through holes 53 </ b> A, 53 </ b> A penetrating the fixed plate 53 vertically, and the upper ends of the adjustment sleeves 27 protrude upward from the fixed plate 53.

  A total of four support poles 55 are erected from the fixed plate 53. These support poles 55 are provided side by side at both ends of the fixing plate 53 in the lateral direction. And the raising / lowering plate 56 is supported by these support poles 55 so that linear movement is possible. As shown in FIG. 8, the elevating plate 56 has a flat plate shape and is provided with through holes 56 </ b> A through which the support poles 55 penetrate at positions close to both ends in the lateral direction. A bush 56B made of a sliding member is press-fitted into the through holes 56A.

  As shown in FIG. 3, the elevating plate 56 is formed with a pair of screw holes 56N and 56N on the same axis as the special punches 32 and 32, and adjustment bolts 57 and 57 are screwed and attached thereto. The adjusting bolts 57 and 57 are in contact with the upper ends of the special punches 32 and 32. The upper end portion of the adjustment bolt 57 has a hexagonal cross section, and a center hole 57A communicating with the center hole 32A of the special punch 32 is formed at the center of the adjustment bolt 57.

  As shown in FIG. 8, square roller accommodating holes 56 </ b> C and 56 </ b> C are formed at both lateral ends of the elevating plate 56, and pin holes 56 </ b> D orthogonal to the roller accommodating holes 56 </ b> C are formed. . Further, one end portion of each pin hole 56 </ b> D opens to the side surface of the elevating plate 56. A roller 58 is housed in each roller housing hole 56C and is rotatably supported by a pin 56P passing through the pin hole 56D. As shown in FIG. 4, a part of the roller 58 protrudes above the lifting plate 56.

  The pair of side walls 54, 54 are bolted to both side surfaces of the fixed base 52 and stand above the fixed base 52. The camshaft 59 is passed between the upper ends of the side walls 54 and 54 and is rotatably supported, and is disposed directly above the rollers 58 and 58. In addition, rotary cams 60, 60 are provided at positions facing the rollers 58, 58 in the cam shaft 59 so as to be integrally rotatable. As shown in FIG. 6, the rotary cam 60 has a circular shape, and the center portion of the rotary cam 60 is shifted from the center portion of the cam shaft 59. The elevating plate 56 is biased upward by the elastic force of the compression coil spring 37 described above, and each roller 58 is in contact with each rotating cam 60. As a result, as shown in FIGS. 6 and 7, the special punches 32 and 32 move up and down together with the lift plate 56 as the camshaft 59 rotates.

  As shown in FIG. 4, a pulley 59 </ b> P is fixed to the left end portion of the camshaft 59 that protrudes outward from the side wall 54 so as to be integrally rotatable. Further, as shown in FIG. 2, a support plate 62 is disposed on the upper side of the ram 20 above the support frame 51 via a pipe member 63. Specifically, through holes are formed at the four corners of the support plate 62, and screw holes are formed at four positions on the front surface of the ram 20 corresponding to the through holes. Then, the bolts passed through the through holes of the support plate 62 are passed through the pipe member 63 and tightened into the screw holes of the ram 20, so that the support plate 62 is disposed to face the ram 20 as described above.

  A servo motor 50 is attached to the surface of the support plate 62 facing the ram 20. The servo motor 50 is integrally provided with a reduction gear 50G, and a pulley 50P is fixed to the output shaft of the reduction gear 50G. The pulley 50P and the pulley 59P of the camshaft 59 are connected by a timing belt 61.

  This completes the description of the configuration of the press machine 10 of the present embodiment. Next, the effect of this press machine 10 is demonstrated. When the above-described press 10 is driven, a circular sheet metal (not shown) is supplied as a workpiece to the leftmost processing stage S (see FIG. 1). Then, the disk-shaped work is usually pressed into the forming hole of the die 17 by the punch 30 and drawn into a cylindrical shape. Further, the molded workpiece is discharged above the molding hole by a knockout pin provided on the back side of the molding hole. And it is hold | gripped by the transfer apparatus 18 and conveyed to the process stage S on the right, where it is normally drawn by the punch 30 by the punch 30 and is drawn. That is, each time the ram 20 moves up and down, the workpiece is conveyed to the processing stage S adjacent to the right by the transfer device 18 and repeatedly drawn, and the height of the workpiece gradually increases.

  Here, when the ram 20 reaches the top dead center, for example, the special punch 32 starts to descend through the top dead center (FIG. 6) with respect to the ram 20. When the distance between the tip of the lowered special punch 32 and the die 17 is higher than the height of the workpiece or the transfer device 18, the workpiece is conveyed to the processing stage S having the special punch 32. When the ram 20 starts to descend from the top dead center, the special punch 32 reaches the bottom dead center with respect to the ram 20 immediately before the tip of the special punch 32 comes into contact with the bottom of the workpiece. In this state, the tip of the special punch 32 comes into contact with the bottom of the work and the work is pushed into the forming hole. That is, since the special punch 32 is arranged at or near the bottom dead center with respect to the ram 20 when the machining load from the workpiece to the special punch 32 is the largest, the special punch 32 mainly lowers the ram 20. Machining a workpiece with driving force.

  The special punch 32 is detached from the workpiece while the ram 20 reaches the bottom dead center, and the special punch 32 rises with respect to the ram 20 before the ram 20 reaches the top dead center. Thereby, the special punch 32 is greatly separated from the workpiece, and the workpiece can be conveyed from the processing stage S having the special punch 32 to the processing stage S adjacent to the right without worrying about interference with the special punch 32. The special punch 32 reaches the top dead center for the ram 20 before the ram 20 reaches the top dead center. When the ram 20 reaches the top dead center, the special punch 32 passes the top dead center for the ram 20. Then start descending and return to the initial state.

  In the final processing stage S, processing such as trimming is performed to lower the workpiece, so that there is no fear of interference with the workpiece even if the normal punch 30 is used instead of the special punch 32.

  As described above, the press machine 10 of the present embodiment is a single press machine, and has the normal punch 30 and the special punch 32 having different strokes. Therefore, the height of the press machine 10 is lower than that using a plurality of press machines. A plurality of greatly different workpieces can be formed at a time.

  In particular, in the case where the transfer device 18 is provided and the workpiece is sequentially transferred and processed at a plurality of processing stages, the height of the workpiece increases toward the end side in the transfer direction, so the press machine 10 of the present embodiment. Therefore, it is possible to easily cope with this.

  Further, since the special punch 32 is disposed at or near the bottom dead center with respect to the ram 20 when the processing load from the workpiece to the special punch 32 becomes the largest, the special punch 32 mainly lowers the ram 20. Machining a workpiece with driving force. Thereby, it is not necessary to increase the driving force of the additional drive mechanism 89K, and the additional drive mechanism 89K can be reduced in size and weight.

  In the above embodiment, the set of parts for driving the special punch 32 corresponds to the press machine modification set according to the present invention. If this press machine modification set is used, the conventional press machine can be easily and The press machine 10 according to the present invention can be modified at low cost. Moreover, since the vertical groove portion 22 of the ram 20 for fixing the normal punch 30 is also used for assembling the special punch 32, the remodeling cost of the press machine 10 can be suppressed. Furthermore, any one of the special punch 32 and the normal punch 30 can be arbitrarily selected and attached to the plurality of vertical grooves 22, and it is possible to cope with various shapes of workpieces.

  In order to assemble the press machine modification set to the press machine 10, parts other than the punch unit 32U and the adjustment sleeve 27 are first assembled to the press machine 10, and the adjustment sleeve 27 and the punch unit 32U are assembled in this order. . The maintenance of the special punch 32 can be performed, for example, by removing the bottom cover 28 from the punch guide 26 and removing the punch body 33 from the connecting portion 35.

[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 are within the scope not departing from the gist. It can be changed and implemented.

(1) In the above-described embodiment, as the mechanism for converting the rotation of the servo motor 50 into the direct movement of the special punch 32, the mechanism provided with the rotating cam 60 has been described, but a ball screw mechanism, a rack and pinion mechanism, A crank lever mechanism may be used.

(2) In the above embodiment, the servomotor 50 is connected to the camshaft 59 via the timing belt 61. However, for example, the servomotor 50 is fixed to the side wall 54 of the support frame 51 to fix the servomotor 50. The rotation output shaft of the reduction gear 50G may be connected to the camshaft 59.

DESCRIPTION OF SYMBOLS 10 Press machine 17 Die 18 Transfer apparatus 20 Ram 21 Ram lower end block 22 Vertical groove part 26 Punch guide 30 Normal punch 32 Special punch 37 Compression coil spring 50 Servo motor 60 Rotating cam 89 Cam mechanism 89K Additional drive mechanism S Processing stage

Claims (5)

Press machine in which workpieces are sequentially conveyed from one end to the other end of a plurality of processing stages composed of a plurality of punches mounted in a row on a ram and a plurality of dies opposed to the rams from below. In
A ram lower end block protruding forward from the lower front edge of the ram;
A plurality of longitudinal grooves formed side by side on the lower end block of the ram, and receiving upper portions of the punches;
Among the plurality of vertical groove portions, disposed in or above a portion of the vertical groove portion on the terminal end side in the workpiece conveyance direction, and supports a part of the plurality of punches as a special punch so as to be linearly movable. Punch guide,
A fixing member that prevents the upper part of the normal punch excluding the special punch among the plurality of punches from remaining in the plurality of vertical groove portions excluding the part of the vertical groove portions.
Wherein mounted on the ram has a servo motor as a drive source, a press in the additional driving mechanism for vertically moving, is provided with respect to the ram in synchronism with the special punch to the ram of the linear operation. The additional drive mechanism, when the processing load from the workpiece to the special punch becomes the largest, the special punch is disposed at or near the bottom dead center with respect to the ram, when the ram rises, The press according to claim 1, wherein the special punch is raised with respect to the ram . The said additional drive mechanism is provided with the elastic member which urges | biases the said special punch upwards, and the rotation cam which is rotationally driven by the said servomotor and pushes down the said special punch. The press machine described. A plurality of vertical groove portions are formed in a row in the ram lower end block protruding forward from the front lower edge portion of the ram, and an upper portion of the punch is fixed by a fixing member in the plurality of vertical groove portions. It is a press machine modification set that is assembled to the ram of a press machine in which workpieces are sequentially conveyed from one end to the other end of a plurality of processing stages composed of a plurality of dies opposed to each other from below. hand,
Among the plurality of vertical groove portions, disposed in or above a portion of the vertical groove portion on the terminal end side in the workpiece conveyance direction, and supports a part of the plurality of punches as a special punch so as to be linearly movable. Punch guide,
A press machine modification set comprising: an additional drive mechanism mounted on the ram, having a servo motor as a drive source, and moving the special punch up and down relative to the ram in synchronization with the operation of the ram. 5. The press according to claim 4, wherein the additional drive mechanism includes an elastic member that urges the special punch upward, and a rotary cam that is rotationally driven by the servomotor and pushes down the special punch. Machine modification set.

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