JP2014008528A - Passing machining die and passing machining mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a passing machining die capable of efficiently carrying out passing machining while finishing an overlapping part of punch holes to be smooth, and easily grinding a worn punching edge again, by being used in combination with a passing machining punch.SOLUTION: A passing machining die 11 is composed of a die body 12 and a blade member 13. The die body 12 has a through-hole 14 vertically penetrating the body. An upper end edge on a downstream side in a plate material feeding direction A at an upper surface opening peripheral edge of the through-hole 14, and upper end edges on both sides in the plate material feeding direction A are made to be punching edges 12b, 12c, and 12d. A blade member seat surface 17 is formed adjacent to an upstream side in the plate material feeding direction A of the through-hole 14. The blade member 13 can be installed to the blade member seat surface 17 and has height dimensions lower than the punching edges 12b, 12c, and 12d on an upper surface in the installed state. The upper end edge on the downstream side in the plate material feeding direction A is made to be a punching edge 13a.

Description

  The present invention relates to a die for overtaking used for overtaking a plate material by a punch press, and a die for overtaking comprising a combination of the overtaking die and a punch for overtaking.

  When performing a punching process on a plate material by a punch press, using a die having a through hole penetrating up and down in a rectangular shape and a punch having a blade portion that fits into the through hole of this die, A method of continuously processing a large number of punch holes while partially overlapping each other is employed. However, according to this method, there is a problem in that a seam having an uncomfortable feeling is left at one end of an overlapping portion of punch holes that are continuously opened. The seam includes the following elements (FIG. 15).

  The seam 66 of the sag surface 63 is caused by the fact that no sag occurs in the vicinity of the upper edge 61aa of the corner 61a in the punch hole 61 as shown in FIG. That is, when the punch hole 61 is formed by the current machining, the upper edge 61a of the corner 61a where the sagging does not occur in the punch hole 61 formed by the previous machining remains as a projection. The reason why the sagging does not occur in the vicinity of the upper edge 61aa of the corner portion 61a is that the interval between the punch 1 and the upper edge of the punch hole 61 is farther in the corner portion 61a than in other portions as shown in FIG. (B> C) Therefore, it is considered that the punching force of the punch 1 is not easily transmitted to the plate material W.

  The cut surface protrusion 67 (FIG. 15) is caused by the fact that the fracture surface does not occur at the corner portion 61a of the punch hole 61 and the shear surface reaches the lower end as shown by the shear surface portion 64a in FIG. As shown in FIG. 18, since the fracture surface 65 recedes from the shear surface 64, when the punch hole 61 is formed by the current processing, the shear surface portion 64a extending to the lower end of the punch hole 61 formed by the previous processing. This part is in a state protruding from the surrounding fracture surface 65.

  The protrusion 68 (FIG. 15) on the lower surface is lowered while the shearing surface portion 64a (FIG. 16) extending to the lower end of the plate member W formed at the corner portion 61a of the punch hole 61 is rubbed with the side surface of the punch 1 at this time. As a result of being pulled, the plate member W protrudes downward from the lower surface. This is a portion where so-called burrs are formed largely.

  These seams were processed manually by sanding or sanding in the subsequent process. In the manual processing, there is a problem that the finishing quality varies depending on the operator, and the man-hours are increased and the processing efficiency is lowered.

  Therefore, as a punching method that eliminates the various seams or makes it as inconspicuous as possible, a punching punch having a cutting blade portion whose bottom surface is inclined with respect to the horizontal is used, and the cutting blade portion does not punch a plate material. There has been proposed a method in which the next cut is processed after the previous cut as if only the cut is made in (for example, Patent Documents 1 and 2). Further, Patent Document 3 proposes a machining method in which a workpiece is half-cut at a predetermined interval, and then a portion extending from one adjacent half-cut portion to the other half-cut portion is removed, thereby eliminating a joint. Furthermore, in Patent Document 4, one side edge portion of the punch and die is formed in an arc shape, and the arc-shaped portion of the first processed hole is fed into the arc-shaped portion of the punch and die to perform overtaking processing. This makes the seam of the sagging surface inconspicuous.

Japanese Patent No. 3401908 Japanese Patent No. 3960066 Japanese Patent No. 4518539 Japanese Patent Publication No.61-9895

  According to the proposed processing method, the corners of the punch holes are sag and fractured like the other parts, so a punching process is performed in which a large number of punch holes are continuously overlapped with each other. In this case, the overlapping part of the punched holes becomes a smooth continuous surface, resulting in a beautiful finish. However, the mold used for this processing is expensive because of its complicated shape. Moreover, since the length of the punch hole that can be opened by one punching process is short, the processing efficiency is lowered. Furthermore, it is necessary to finely adjust the punch down height, and complicated control is required.

  In order to solve the above problems, the planar shape is a rectangular shape and has a through-hole penetrating up and down, and the height of the upper surface is higher than the other parts from the upper surface opening edge on the upstream side of the plate material feed direction to the upstream side. A die having a low recess and a blade portion that fits into the through-hole of the die and enters a state where the blade portion is upstream of the plate material feed direction. I have come up with a die for overtaking that consists of a combination of punches. It has been confirmed that the use of this die for overtaking allows the plate material to be efficiently overtaken while smoothly finishing the overlapping portion of the punch holes. Further, since the overtaking mold has a relatively simple configuration, it can be manufactured at low cost.

  When the punching edge around the through hole is worn with use, the punching edge is ground again by polishing the upper surface of the punching edge. However, the die of the overtaking die has a concave portion whose upper surface has an upper surface lower than the other portion at the upstream opening edge to the upstream side of the through hole in the plate material feeding direction. It is difficult to grind both ends of the punching edge that becomes the edge of the recess. This is because the punching edge that becomes the edge of the concave portion is polished with the polishing tool in the concave portion, and the upper surface is polished. In this case, the polishing tool hits the wall surface of the concave portion, so the edge of the wall cannot be polished. It is.

The object of the present invention is to use it in combination with a punch for punching, which allows the punching process to be efficiently performed while smoothly finishing the overlapping portion of the punch holes, and allows the worn punching edge to be easily reground. It is to provide a processing die.
Another object of the present invention is to make it possible to accurately position the blade member with respect to the die body when the overtaking die is constituted by a die body and a blade member.
Still another object of the present invention is a combination of a die for overtaking and a punch for overtaking, which allows for efficient overtaking while smoothly finishing the overlapping portion of the punch holes, and wear of the overtaking die. It is an object of the present invention to provide a die for overtaking that can easily grind the punched edge.

  The overtaking die of the present invention is used for overtaking together with the overtaking punch. The overtaking die includes a die body and a blade member that is detachable from the die body. The die body has a rectangular shape whose plan shape is long in the plate material feed direction and has a through-hole penetrating vertically. An upper end edge on the downstream side of the plate material feed direction and an upper end on both sides along the plate material feed direction at the upper surface opening periphery of the through hole An edge is a punching edge, and a blade member seating surface having a height position lower than the punching edge is formed adjacent to the upstream side of the through hole in the plate material feeding direction. The blade member can be attached to the blade member seating surface, and has a height dimension such that the upper surface is lower than the punching edge in the attached state, and the upper end edge on the downstream side in the plate material feeding direction is the punching edge.

  In the overtaking die having this configuration, the blade member is mounted on the blade member seating surface of the die body. When the blade member is mounted, the upper surface of the blade member is lower than the upper surface of the die body. The upper end edge on the downstream side of the plate material feed direction and the upper end edge on both sides along the plate material feed direction at the peripheral edge of the upper surface opening of the through hole of the die body, and the upper end edge on the downstream side of the blade member in the plate material feed direction are die side punching edges. . When each punching edge is worn with use, each punching edge is ground again by polishing the upper surface of each punching edge. At that time, by removing the blade member from the die body, the upper surface of the punching edge of the blade member can be easily polished.

  This overtaking die has a blade portion that fits into the through-hole of this die, and the corner portion on the upstream side in the plate material feed direction of this blade portion is formed in an arc shape in plan view. Used in combination with punches. For example, the sheet material is overtaken in the following order.

  That is, by placing a plate material horizontally on the die and punching the plate material by punching down, a rectangular punch hole that matches the planar shape of the die and punch is formed in the plate material. . Since the portion from the upper surface opening edge upstream of the plate material feed direction upstream to the upstream side of the die is a blade member with a low height, the plate material portion adjacent to the upstream end of the punch hole plate material feed direction is the die body. This is a molded part that is deformed downward by a height difference between the upper surface of the blade member and the upper surface of the blade member. In addition, the punch has a corner portion on the upstream side in the plate material feed direction of the blade portion formed in an arc shape in plan view, so that the distance between the punch in the corner portion and the upper edge of the punch hole is the same distance in other locations. Is the same. Thereby, a sagging surface is also generated at the corner portion of the punch hole.

  When punching a plate so that the punch hole formed in the previous machining and the punch hole formed in the current machining partially overlap each other, adjacent to the upstream end of the punch hole formed in the previous machining in the plate material feed direction The sagging surface is due to the synergistic effect that the plate material part to be formed is a molded part deformed downward and the punched surface formed in the previous processing has a sagging surface at the upstream corner of the plate material feeding direction. The occurrence of seam at the end is suppressed. In addition, since the fracture surface is formed at the corner of the punch hole formed in the previous machining, there is no trace of the shearing surface at the bottom of the cutting surface when machining this time, and no protrusion on the cutting surface is generated. . In addition, if a fracture surface is formed at the corner of the punch hole formed in the previous machining, even if it is pulled downward while being rubbed by the side of the punch during this machining, the amount of protrusion to the lower surface of the plate material There are few, and the protrusion of a lower surface is suppressed.

  In this invention, the die body may be provided with a positioning pin protruding upward from the blade member seating surface, and a pin hole into which the protruding portion of the positioning pin is fitted on the lower surface of the blade member. . Thereby, the blade member can be accurately positioned with respect to the die body.

  The die for overtaking of the present invention is a combination of a die for overtaking and a punch for overtaking, and the punch hole formed by the previous machining and the punch hole formed by the current machining overlap each other in the sheet material feeding direction. In this way, a long hole is formed by overtaking the plate material. The overtaking die includes a die body and a blade member that is detachable from the die body. The die body has a rectangular shape whose plan shape is long in the plate material feed direction and has a through hole vertically passing therethrough. An edge is a punching edge, and a blade member seating surface having a height position lower than the punching edge is formed adjacent to the upstream side of the through hole in the plate material feeding direction. The blade member can be attached to the blade member seating surface, and has a height dimension in which the upper surface is lower than the punching edge of the die body in the mounting state, and the upper end edge on the downstream side in the plate material feeding direction is the punching edge. ing. The overtaking punch has a blade portion that fits into the through-hole of the overtaking die and enters a state in which the blade portion is upstream of the plate material feed direction. The corner portion is formed in an arc shape in plan view. ing.

  The overtaking die of the overtaking die having this configuration is formed by mounting a blade member on the blade member seating surface of the die body. When the blade member is mounted, the upper surface of the blade member is lower than the upper surface of the die body. The upper end edge on the downstream side of the plate material feed direction and the upper end edge on both sides along the plate material feed direction at the peripheral edge of the upper surface opening of the through hole of the die body and the upper edge of the blade member on the downstream side in the plate material feed direction Become an edge. When each punching edge is worn with use, each punching edge is ground again by polishing the upper surface of each punching edge. At that time, by removing the blade member from the die body, the upper surface of the punching edge of the blade member can be easily polished.

  According to this die for overtaking processing, a plate material is placed horizontally on the die, punched down by punching the plate material, and a rectangular shape that matches the planar shape of the die and punch on the plate material Shaped punch holes are formed. Since the portion from the upper surface opening edge upstream of the plate material feed direction upstream to the upstream side of the die is a blade member with a low height, the plate material portion adjacent to the upstream end of the punch hole plate material feed direction is the die body. This is a molded part that is deformed downward by a height difference between the upper surface of the blade member and the upper surface of the blade member. In addition, the punch has a corner portion on the upstream side in the plate material feed direction of the blade portion formed in an arc shape in plan view, so that the distance between the punch in the corner portion and the upper edge of the punch hole is the same distance in other locations. Is the same. Thereby, a sagging surface is also generated at the corner portion of the punch hole.

  When punching a plate so that the punch hole formed in the previous machining and the punch hole formed in the current machining partially overlap each other, adjacent to the upstream end of the punch hole formed in the previous machining in the plate material feed direction The sagging surface is due to the synergistic effect that the plate material part to be formed is a molded part deformed downward and the punched surface formed in the previous processing has a sagging surface at the upstream corner of the plate material feeding direction. The occurrence of seam at the end is suppressed. In addition, since the fracture surface is formed at the corner of the punch hole formed in the previous machining, there is no trace of the shearing surface at the bottom of the cutting surface when machining this time, and no protrusion on the cutting surface is generated. . In addition, if a fracture surface is formed at the corner of the punch hole formed in the previous machining, even if it is pulled downward while being rubbed by the side of the punch during this machining, the amount of protrusion to the lower surface of the plate material There are few, and the protrusion of a lower surface is suppressed.

  Since the die blade member is provided only on the upstream side in the plate material feed direction, and the arcuate portion in plan view at the corner of the punch blade portion is formed only on the upstream side in the plate material feed direction, the die and punch plate material feed By performing punching with the direction of the direction reversed, the upstream end of the punch hole in the sheet material feeding direction can be punched into a rectangular shape, for example, a right angle, in the same planar shape as the downstream side. Therefore, it is possible to form a long hole with only one set of overtaking dies.

  Compared to conventional overcutting molds, this overcutting mold has a shorter machining margin because the overlap between the previous punch hole and the current punch hole in the plate feed direction is shorter. good. Further, since the overtaking mold has a simple configuration as compared with, for example, those of Patent Documents 1 and 2, it can be manufactured at low cost.

  The die for overtaking of the present invention is used for overtaking with a punch, and comprises a die body and a blade member that can be attached to and detached from the die body. Has a through hole penetrating up and down in a rectangular shape that is long in the plate material feed direction, and the upper edge on the downstream side of the plate material feed direction and the upper edge on both sides along the plate material feed direction in the upper surface opening periphery of this through hole are punched edges, And a blade member seating surface having a height position lower than the punching edge is formed adjacent to the upstream side in the plate material feed direction of the through hole, and the blade member can be mounted on the blade member seating surface, and the mounting state In this case, the upper surface is lower than the punching edge, and the upper end edge on the downstream side in the sheet material feeding direction is the punching edge. Overtaking process can be a efficiently performed easily remedied sharpening the worn punching edge.

  When the die body is provided with a positioning pin that protrudes upward from the blade member seating surface, and the pin body is provided with a pin hole into which the protruding portion of the positioning pin is fitted, the die body The blade member can be accurately positioned with respect to.

  The die for overtaking of the present invention is a combination of a die for overtaking and a punch for overtaking, and the punch hole formed by the previous machining and the punch hole formed by the current machining overlap each other in the sheet material feeding direction. In order to form a long hole by overtaking the plate material, the overtaking die comprises a die body and a blade member that is detachable from the die body. The die main body has a rectangular shape whose plan shape is long in the plate material feed direction, and has a through hole that penetrates up and down. The upper end edge on the downstream side of the plate material feed direction and the upper edge on both sides along the plate material feed direction at the upper surface opening periphery Is a punching edge, and a blade member seating surface having a height position lower than the punching edge is formed adjacent to the upstream side of the through-hole in the plate material feeding direction, and the blade member includes the blade portion. It can be mounted on the seating surface, and in the mounted state, has a height dimension where the upper surface is lower than the punching edge of the die body, the upper end edge on the downstream side in the sheet material feeding direction is a punching edge, and the punch for punching is Since there is a blade portion that fits into the through hole of the overtaking die and the corner portion on the upstream side in the plate material feed direction of the blade portion is formed in an arc shape in plan view, The overcutting process can be efficiently performed while finishing the overlapped portion smoothly, and the worn punching edge of the overtaking die can be easily reground.

It is sectional drawing of the metal mold | die mounting part of the punch press with which the metal mold | die for overtaking according to one Embodiment of this invention was mounted | worn. (A) is a front view of the punch of the die for overtaking, and (B) is a bottom view showing an enlarged part thereof. (A) is the figure which exaggerated and represented the bottom face shape of the blade part of the punch, (B) is the figure which exaggerated and represented the bottom face shape of the blade part of a different punch. (A) is a plan view of the die of the overtaking die, and (B) is a sectional view taken along the line IVB-IVB. It is VV sectional drawing of FIG. 4 (A). It is an exploded sectional view of the die. (A)-(D) is a figure which shows the process of the long hole formation method of the board | plate material using the same die for overtaking. It is sectional drawing of the metal mold | die mounting part which shows the operation | movement of the 1st punch process in the long hole formation process of a board | plate material. It is a perspective view of the corner part of the punch hole processed using the die for overtaking. It is a top view which shows the positional relationship of the punch and the upper end edge of a punch hole. It is sectional drawing of the metal mold | die mounting part which shows the operation | movement of the 2nd punching in the long hole formation process of a board | plate material. It is a perspective view of the cut surface of the punch hole processed using the die for overtaking. It is a figure which shows the planar positional relationship of the punch hole and punch in the overtaking process. It is sectional drawing of the metal mold | die mounting part which shows the operation | movement of the final punch process in the long hole formation process of a board | plate material. It is a perspective view of the cut surface of the punch hole processed using the conventional die for overtaking. It is a perspective view of the corner part of the punch hole processed using the conventional die for overtaking. It is a top view which shows the positional relationship of the conventional punch and the upper end edge of a punch hole. It is a figure which shows the cross-sectional shape of the cut surface of a board | plate material.

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a die mounting portion of a punch press to which a die for overtaking according to an embodiment of the present invention is mounted. The die for overtaking is composed of a punch for overtaking (hereinafter referred to as “punch”) 1 and a die for overtaking (hereinafter referred to as “die”) 11. A plate material W is horizontally placed on the die 11. The punch 1 is dropped on the plate material W to perform punching.

  As shown in FIG. 2, the punch 1 is provided with a blade portion 3 at the lower end of the handle portion 2. The blade 3 has a rectangular cross-sectional shape, and its bottom surface is inclined upward as it goes to the upstream side (the right side in FIG. 2) in the width direction, that is, the sheet material feeding direction A. The direction perpendicular to the sheet material feeding direction A on the bottom surface (the direction perpendicular to the paper surface) is the same height level. The four sides of the bottom surface of the blade portion 3 are punch side punching edges 3a, 3b, 3c, 3d for punching the plate material W in cooperation with die side punching edges 13a, 12b, 12c, 12d described later. Note that the direction of the punch 1 shown in FIG. 2 is the direction when performing the overtaking process.

  More specifically, the cross-sectional shape of the blade portion 3 is such that the width gradually decreases toward the downstream side in the sheet material feeding direction A. That is, the cross-sectional shape of the blade portion 3 is not exactly a rectangular shape, but has a trapezoidal shape as shown in FIG. However, since the degree of narrowing of the width is extremely small, it can be said that it is rectangular. In this example, the width is narrowed over the entire area of the sheet material feeding direction A, but as shown in FIG. 3B, at least the punch hole formed by the previous process in the overtaking process and the punch hole formed by the current process Only a part of the range H including a portion punched out at the time of the previous machining may be formed such that the width gradually decreases toward the downstream side in the sheet material feeding direction A.

  As shown in the partially enlarged view of FIG. 2B, the corner portion 4 on the upstream side in the sheet material feeding direction A is formed in an arc shape in plan view. The corner portion 5 on the downstream side in the sheet material feeding direction A is formed at a right angle in plan view.

  4-6 show the die. The die 11 includes a die body 12 and a blade member 13 that is detachably attached to the die body 12.

  The die body 12 has a substantially circular planar shape, and a through-hole 14 through which the blade part 3 of the punch 1 can enter is provided at the center thereof so as to penetrate vertically. The through hole 14 is a rectangular stepped hole that is long in the sheet material feeding direction A, and the upper hole portion 14 a has a cross-sectional shape into which the blade portion 3 of the punch 1 is fitted. However, since the recessed postscript fitting portion 16 is provided on the upstream side of the plate material feed direction A of the upper hole portion 14a, the upper hole portion 14a is configured such that the upstream side of the plate material feed direction A is open. Therefore, the upper hole portion 14a has an upper end edge on the downstream side in the plate material feed direction A and upper end edges on both sides along the plate material feed direction A, and these upper end edges are the punch side punching edges 3a, 3b, 3c, The die side punching edges 12b, 12c, and 12d are respectively meshed with the punching 3b, 3c, and 3d on three sides of 3d.

  The upper surface central portion 15a along the plate material feed direction A around the through hole 14 on the upper surface 15 of the die body 12 is one step higher than both side portions 15b except for a portion adjacent to the upstream side of the plate material feed direction A of the through hole 14. It is formed as a flat surface. The upper surface central portion 15a is a surface on which the plate material W is placed during processing. A portion of the upper surface central portion 15a adjacent to the upstream side of the plate material feeding direction A of the through hole 14 is a groove-like fitting portion 16 having the same width as the upper hole portion 14a of the through hole 14 and extending in the plate material feeding direction A. Yes. The upper surface of the fitting portion 16 is a horizontal blade member seating surface 17.

  A phase determining pin 18 for determining a phase in the circumferential direction when the die 11 is mounted on a turret of a punch press is provided at one circumferential position in the vicinity of the outer peripheral edge of the bottom surface of the die body 12 with its tip below the bottom surface. It is provided to protrude.

  The blade member 13 has a width that fits just into the fitting portion 16, and the upper edge of one of the width surfaces is a punching edge 13a. The blade member 13 is mounted on the die body 12 with the punching edge 13a facing the through hole 14 and the bottom surface seated on the blade member seating surface 17. In the mounted state, the heights of the punching edge 13a and the upper surface 19 of the blade member 13 are lower than the punching edges 12b, 12c, and 12d of the die body 12. As a result, the upper surface 19 of the blade member 13 and both side surfaces of the fitting portion 16 form a recess 19a that is recessed from the upper surface center portion 15a.

  The blade member 13 is attached to the die body 12 by positioning the blade member 13 in the plate material feed direction A with the positioning pins 20 and then fixing the die body 12 and the blade member 13 with the fixing bolt 21.

  Specifically, as shown in FIG. 6, the positioning pin 20 is inserted from above into a pin hole 22 penetrating up and down of the die body 12 so that the upper end of the positioning pin 20 protrudes above the blade member seating surface 17. Provided. For example, the positioning pin 20 is fixed at an appropriate position of the pin hole 22 by press-fitting. The upper and lower ends of the positioning pins 20 are formed in a tapered shape. The blade member 13 is provided with a positioning hole 23 penetrating vertically. By fitting the upper end protruding portion of the positioning pin 20 into the positioning hole 23, the plate member of the blade member 13 with respect to the die body 12. The position in the feed direction A is accurately positioned. The positioning hole 23 may be a hole that opens to the bottom surface of the blade member 13 and may not be a through hole. Since the upper end and the lower end of the positioning pin 20 are formed in a tapered shape, the positioning pin 20 can be smoothly press-fitted into the pin hole 22, and the upper end protruding portion of the positioning pin 20 can be inserted into the positioning hole 23. Can be smoothly fitted.

  The fixing bolt 21 is inserted from below into the bolt insertion hole 24 of the die body 12, and the screw portion 21 a is screwed into the screw hole 25 of the blade member 13, thereby fixing the die body 12 and the blade member 13. . The bolt insertion hole 24 is a counterbore hole so that the head 21 b of the fixing bolt 21 does not protrude below the bottom surface of the die body 12.

As shown in FIG. 1, the punch 1 and the die 11 of the overtaking die are mounted and used on a die mounting portion of a punch press.
The punch 1 is attached to the head member 31 with a set bolt 32, and is fitted in a mold installation hole 35 of the upper turret 34 via a punch holder 33 so as to be movable up and down. The head member 31 is engaged with a ram 36 of a punch drive mechanism (not shown) with its T-shaped head and is driven up and down. The punch drive mechanism may be a crank type or a hydraulic type. The punch holder 33 is raised and lowered by presser springs 37A and 37B so as to be movable up and down, and a stripper plate 38 is attached to the lower end.

  The punch 1 is an index tool capable of indexing the angle. That is, the mold installation hole 35 is provided in the rotating body 41 that is rotatable with respect to the turret body 34a. The rotating body 41 has a worm wheel 42 on its outer peripheral surface, and a worm gear 44 provided on a rotating shaft 43 disposed in the radial direction of the turret 34 is engaged with the worm wheel 42. By rotating the rotating shaft 43 by the driving means, the rotation is transmitted to the rotating body 41 via the worm gear 44 and the worm wheel 42, and the punch 1 is indexed at a desired angle.

  The die 11 is also an index tool capable of indexing the angle. That is, the die holder 47 is rotatably mounted on the lower turret 46, and the die 11 is held by the die holder 47. The circumferential phasing of the die 11 with respect to the lower turret 46 is performed by the phasing pin 18 (FIG. 5). The die holder 47 has a worm wheel 48 on its outer peripheral surface, and a worm gear 50 provided on a rotary shaft 49 arranged in the radial direction of the turret 46 is engaged with the worm wheel 48. By rotating the rotating shaft 49 by the driving means, the rotation is transmitted to the die holder 47 via the worm gear 50 and the worm wheel 48, and the die 11 is indexed at a desired angle.

  The upper and lower turrets 34 and 46 are mold support members that support various molds for punching at a plurality of locations in the circumferential direction. As one of the installation molds, punches for overtaking molds are used. 1 and a die 11 are installed. A punch (not shown) and a die (not shown) other than the die for overtaking are also provided so as to be able to index the angle as described above. The punch press for installing these punches and dies is not limited to the turret type, and the punch and die may be installed on a mold support member (not shown) different from the turret.

  A punching method using a punching die composed of a combination of the punch 1 and the die 11 will be described by taking as an example the case where the long hole 60 is formed in the plate material W as shown in FIG. Schematically, a punch hole 61 is formed by punching the plate material W so that the punch hole 61 formed by the previous processing and the punch hole 61 formed by the current processing partially overlap each other by a punch press. To do.

  FIG. 8 shows the first punching operation. Specifically, the punch 1 and the die 11 are punched so that the starting end of the long hole 60 to be formed in the plate material W is at the same plane position as the punch 1 and the die 11 as shown in FIG. The plate material W is positioned so that the hole coincides with the starting end of the long hole 60. In this state, the punch 1 is driven down as shown in FIG. 5B, and the plate material W is punched out to punch hole 61 (1) (FIG. 7 (A)). The punched piece Wa that has been punched falls through the through hole 14 of the die body 12.

  In the die side punching edges 13a, 12b, 12c, and 12d, the punching edge 13a formed on the blade member 13 is positioned lower than the punching edges 12b, 12c, and 12d formed on the die body 11. Therefore, when punching the plate material W with the punch 1, the plate material portion adjacent to the upstream end of the punch hole 61 in the plate material feed direction A has the upper surface center portion 15 a of the die body 12 and the upper surface of the blade member 13 as shown in FIG. 9. Accordingly, the molding portion 62 is deformed downward by the height difference of 19, that is, the depth of the concave portion 19a.

  Since the corner portion 4 on the upstream side in the sheet material feeding direction A in the blade portion 3 of the punch 1 is formed in an arc shape in plan view, the distance between the punch 1 and the upper edge of the punch hole 61 is as shown in FIG. The interval B at the corner portion 4 is the same as the interval C at other locations that are straight portions. As a result, as shown in FIG. 9, the sag surface 63 is generated at the corner portion 61 a of the punch hole 61, and the fracture surface 65 is generated below the shear surface 64, as in other places.

  FIG. 11 shows the second punching operation. As shown in FIG. 6A, the plate material W is positioned so that the upstream end in the plate material feed direction A of the first punch hole 61 (1) overlaps the punch 1 and the die 11 in a planar position. As shown in FIG. 7B, the punch 1 is downed to punch the plate material W to form punch holes 61 (2) (FIG. 7B).

  The plate material portion adjacent to the upstream end in the plate material feed direction A of the punch hole 61 (1) formed in the first processing is a molding portion 62 (FIG. 9) deformed downward, and the first time As shown in FIG. 12, due to a synergistic effect with the occurrence of the sag surface 63 (FIG. 9) in the corner portion 61a on the upstream side in the sheet material feed direction A of the punch hole 61 (1) formed by the processing of The joint at one end of the overlapping portion of the first and second punch holes 61 (1) and 61 (2) becomes inconspicuous. That is, the generation of the seam 66 of the sag surface 63 is suppressed. Further, since the fracture surface 65 (FIG. 9) is formed below the corner portion 61a of the punch hole 61 formed by the first machining, the fracture surface 65 (FIG. 9) is formed below the cut surface when the second machining is performed. The protrusion 67 hardly occurs.

  Further, when the fracture surface 65 (FIG. 9) is formed at the corner portion 61a of the punch hole 61 (1) formed by the first machining, the shear surface 64 is used as the blade of the punch 1 at the second machining. Even if it is pulled downward while being rubbed on the side surface of the portion 3, the amount of protrusion of the plate material W onto the lower surface is small. In particular, since the punch 1 of the overtaking die has a shape in which the blade portion 3 gradually narrows toward the downstream side in the sheet material feeding direction A, when performing overtaking, the previous machining is performed as shown in FIG. There is a gap between the side wall surface F1 of the punch hole 61 formed in this step and the side surface F2 of the blade portion 3 of the punch 1 at the time of the current machining, and the side wall surface F1 of the punch hole 61 is not rubbed with the side surface F2 of the blade portion 3. . Therefore, the generation of the protrusion 68 (FIG. 15) on the lower surface can be suppressed.

  Similarly, the punch hole 61 formed in the previous processing and the punch hole 61 formed in the current processing are overtaken in the plate material W so that the end of the long hole 60 to be formed in the plate material W is processed. When the processing proceeds until immediately before (FIG. 7C), the final punching is performed.

  FIG. 14 shows the final punching operation. As shown in FIG. 5A, the direction of the sheet material feeding direction A of the punch 1 and the die 11 is reversed. Then, the plate material W is positioned so that the end of the long hole 60 to be formed in the plate material W is at the same plane position as the punch 1 and the die 11, and in this state, the punch 1 is hit as shown in FIG. The plate material W is punched down to form punch holes 61 (L) (FIG. 7D). Thus, the upstream end of the final punch hole 61 (L) in the sheet material feeding direction A is the same as the downstream side edge by performing punching with the punch 1 and the die 11 in the direction of the sheet material feeding direction A reversed. It can be punched at right angles in a planar shape. That is, it is possible to form the long hole 60 with only one set of overtaking dies.

  Since the descending height of the punch 1 in the punching process is constant, the control system can be configured easily. Compared to conventional overcutting molds, this overcutting mold has a shorter machining margin because the overlap between the previous punch hole and the current punch hole in the plate feed direction is shorter. good. This overtaking mold has a simpler configuration than those of Patent Documents 1 and 2, for example, and can be manufactured at low cost.

  When the punching edges 3a, 3b, 3c, 3d, 13a, 12b, 12c, and 12d of the punch 1 and the die 11 are worn with use, the punching edges are ground again. In the case of the die-side punching edges 13a, 12b, 12c, and 12d, the upper surface 19 of the blade member 13 and the upper surface central portion 15a of the die body 12 are ground and polished. Although it is difficult to polish the upper surface 19 of the blade member 13 with the blade member 13 mounted on the die body 12, the upper surface 19 of the blade member 13 can be easily polished by removing the blade member 13 from the die body 12. It becomes. Thereby, it is possible to reliably grind the punching edge 13a over the entire width.

DESCRIPTION OF SYMBOLS 1 ... Punch 3 ... Blade part 4 ... Corner part 11 ... Die 12 ... Die body 12b, 12c, 12d ... Punching edge 13 ... Blade member 13a ... Punching edge 14 ... Through-hole 17 ... Blade member seating surface 19 ... Upper surface 20 ... Positioning Pin 23 ... Pin hole 61 ... Punch hole A ... Plate material feed direction W ... Plate material

Claims (3)

A die for overtaking used for punching along with a punch,
It consists of a die body and a blade member that is detachable from the die body.
The die body has a rectangular shape whose plan shape is long in the plate material feed direction and has a through-hole penetrating vertically. An upper end edge on the downstream side of the plate material feed direction and an upper end on both sides along the plate material feed direction at the upper surface opening periphery of the through hole The edge is a punching edge, and a blade member seating surface having a height position lower than the punching edge is formed adjacent to the upstream side in the plate material feeding direction of the through hole,
The blade member can be mounted on the blade member seating surface, and has a height dimension that makes the upper surface lower than the punching edge in the mounting state, and the upper end edge on the downstream side in the plate material feeding direction is the punching edge,
Die for overtaking.   2. The die body according to claim 1, further comprising a positioning pin protruding upward from the blade member seating surface, and a pin hole into which a protruding portion of the positioning pin is fitted on the lower surface of the blade member. Die for overtaking. It consists of a combination of a die for overtaking and a punch for overtaking. The punch hole formed in the previous process and the punch hole formed in the current process are over-processed in the plate material feed direction so that they are long. A die for overtaking to form a hole,
The overtaking die is composed of a die body and a blade member that is detachable from the die body.
The die body has a rectangular shape whose plan shape is long in the plate material feed direction and has a through-hole penetrating vertically. An upper end edge on the downstream side of the plate material feed direction and an upper end on both sides along the plate material feed direction at the upper surface opening periphery of the through hole The edge is a punching edge, and a blade member seating surface having a height position lower than the punching edge is formed adjacent to the upstream side in the plate material feeding direction of the through hole,
The blade member can be attached to the blade member seating surface, and has a height dimension in which the upper surface is lower than the punching edge of the die body in the mounting state, and the upper end edge on the downstream side in the plate material feeding direction is the punching edge. ,
The overtaking punch has a blade portion that fits into the through-hole of the overtaking die and enters a state in which the blade portion is upstream of the plate material feed direction. The corner portion is formed in an arc shape in plan view. ing,
Die for overtaking process.

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