JP2009066614A - Punching die and punching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a punching die capable of punching a punched hole at the correct position, and preventing deviation of the clearance between a punch and a die hole corresponding thereto. <P>SOLUTION: In the punching die 1, a rectangular material 100 to be worked is placed on a die plate 20 having a plurality of die holes 21 formed therein, and the material 100 is punched by simultaneously lowering a plurality of punches 30a, 30b from above through a stripper plate 10. The die holes 21 are formed in a row along the longitudinal direction of the material 100 with the predetermined distance from the position corresponding to the center in the width direction of the material 100. The punches 30a, 30b are provided in a deviated manner by the predetermined distance to the center side of the width direction of the material 100 with respect to the corresponding die holes 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a punching die in which a rectangular work material is placed on a die plate in which a plurality of die holes are formed, and a plurality of punches are simultaneously lowered through the stripper plate to punch the work material. It is about.

  Conventionally, punching has been widely used as a general method of metal processing in all industrial fields, from extremely small parts to large ones such as punching metal. A punching die is used during these punching processes.

  The punching die includes a die plate in which a die hole is formed, a stripper plate in which a through hole corresponding to the die hole is formed, and a punch disposed in the through hole. The workpiece can be punched by disposing the workpiece material between the stripper plate and lowering the punch toward the die hole to punch the workpiece material.

  As one of such punching dies, when a plurality of punches are simultaneously lowered through the stripper plate to punch the workpiece, a plurality of hydraulic cylinders are provided on the upper portion of the stripper plate for pressing and fixing the workpiece. It has been proposed that the material to be processed can be uniformly pressed by the stripper plate by pressing the stripper plate with a hydraulic cylinder to suppress dripping and the size of the burrs (for example, , See Patent Document 1).

JP 2002-172434 A

  However, as shown in FIG. 5A, a conventional punching die 500 in which the central axis of the punch 530 disposed through the through hole 511 of the stripper plate 510 and the central axis of the die hole 521 coincide. When a plurality of fine punching holes 601 are simultaneously formed in a predetermined region of the rectangular workpiece material 600, the punches 530 are punched when the plurality of punches 530 are simultaneously lowered to punch the workpiece material 600. Thus, the workpiece 600 is pressed and extended, and the shape of the punching die 500 is exactly the same as the workpiece 600 (the central axis of the punched hole 601 formed on the lower surface of the workpiece 600 and the die hole 521). The center position of the punched hole 601 formed on the lower surface of the workpiece 600 is not transferred and the punched hole 601 is formed at a different position. The central axis is not) or a problem that match the die hole 521, there is a problem that breakage of the lower end periphery of the perforations 601 when the punching hole 601 is formed becomes nonuniform.

  That is, when a plurality of punched holes 601 are formed at the same time along the longitudinal direction at the end in the width direction of the rectangular workpiece material 600, as shown in FIG. When the plurality of punches 530 are simultaneously lowered to punch the workpiece 600, the workpiece 600 is pressed by the punches 530 and extends toward the end in the width direction. Then, as the workpiece material 600 extends, the tip of the punch 530 is bent toward the width direction end portion of the workpiece 600. As a result, as shown in FIG. 6, the punching hole 601 formed by the bent punch 530 is inclined toward the end in the width direction of the material 600 to be processed toward the die plate 520 side. They are displaced (the center axis of the punched hole 601 formed on the lower surface of the workpiece 600 does not match the center axis of the die hole 521). Further, punching is performed by the punch 530 and the die hole 521 corresponding to the punch 530 in a state of being bent and inclined in this manner (a state where the central axis of the punch 530 and the central axis of the die hole 521 do not coincide with each other on the lower surface of the workpiece 600). Since the hole 601 is to be punched, the amount of fracture at the periphery of the lower end portion of the punching hole 601 when the punching hole 601 is formed due to the deviation of the clearance between the punch 530 and the die hole 521 is not uniform, The amount of breakage at the periphery of the lower end portion of the punching hole 601 has direction dependency. As shown in FIG. 7, in the punching hole 601 of the X portion shown in FIG. 6, the breaking amount Wc on the width direction center side is larger than the breaking amount Wo on the width direction end portion side of the lower end portion of the punching hole 601. Is getting bigger. FIG. 7 is an enlarged schematic view of a portion X shown in FIG.

  Even if a punching die having a plurality of hydraulic cylinders provided above the stripper plate as described above is used, such a problem cannot be solved.

  In view of the circumstances described above, the present invention provides a mass-produced punching die capable of forming a punching hole at an accurate position and preventing a deviation in the clearance between the punch and the die hole corresponding to the punching hole. The purpose is to do.

According to an aspect of the present invention, a rectangular workpiece material is placed on a die plate in which a plurality of die holes are formed, and a plurality of punches are simultaneously lowered through the stripper plate to punch the workpiece material. In the punching die, the die holes are provided in a row along the longitudinal direction of the work material at a predetermined distance from a position corresponding to the center in the width direction of the work material, and the punch The punching die is characterized in that it is provided at a predetermined distance from the die hole on the center side in the width direction of the work material.
In this aspect, it is possible to form the punched hole at an accurate position, and to prevent the deviation of the clearance between the punch and the die hole corresponding thereto.

  The punch is provided at a predetermined distance on the center side in the width direction of the work material with respect to the corresponding die hole according to a distance from a position corresponding to the center in the width direction of the work material. It is preferable. According to this, the punching hole can be formed at a more accurate position, and the deviation of the clearance between the punch and the corresponding die hole can be surely prevented.

In another aspect of the present invention, a rectangular work material is placed on a die plate having a plurality of die holes, and a plurality of punches are simultaneously lowered from the top through the stripper plate to form the work material. In a punching method for simultaneously forming a plurality of punched holes, with respect to a plurality of die holes arranged in a row along the longitudinal direction at a predetermined distance from a position corresponding to the center in the width direction of the workpiece material Then, the punches arranged at a predetermined distance in the center in the width direction of the work material are respectively lowered, and the longitudinal direction of the work material is separated from the position corresponding to the center in the width direction by a predetermined distance. A punching method for simultaneously forming a plurality of punched holes arranged in a line along a direction.
In this aspect, it is possible to form the punched hole at an accurate position, and to prevent the deviation of the clearance between the punch and the die hole corresponding thereto.

Hereinafter, the present invention will be described in detail based on embodiments.
(Embodiment 1)
FIG. 1A is a schematic view of a material to be processed before punching, and FIG. 1B is a schematic view of the material to be processed after punching. As shown in these drawings, the punching dies according to the present embodiment are arranged in rows along the longitudinal direction at a predetermined distance from the center in the width direction of the rectangular workpiece 100 (in this embodiment, four rows). ) For forming a plurality of fine punched holes 101 at the same time. The material to be processed is not particularly limited as long as it can be punched, such as SUS, and may be previously punched.

  Hereinafter, a punching die for forming such punching holes 101 at the same time will be described. FIG. 2 is a schematic cross-sectional view showing a punching die according to the present embodiment, FIG. 3 is a schematic cross-sectional view when performing punching using the punching die according to the present embodiment, and FIG. It is a schematic sectional drawing at the time of punching using the punching die which concerns on a form. As shown in FIG. 2, the punching die 1 according to this embodiment includes a stripper plate 10 and a die plate 20 that are disposed so as to face each other with a workpiece 100 interposed therebetween via a spacer (not shown). It comprises.

  The die plate 20 is arranged in a row along the longitudinal direction of the material to be processed 100 at a position separated from the position C corresponding to the center in the width direction of the material 100 to be placed. A plurality of die holes 21 are provided. In the present embodiment, the die holes 21 are provided so as to form four symmetrical rows with the position C corresponding to the center in the width direction of the work material 100 as a center.

  On the other hand, a plurality of through holes 11 corresponding to the above-described die holes 21 are formed in the stripper plate 10, and punches 30 a and 30 b are respectively disposed in the through holes 11. That is, punches 30 a and 30 b corresponding to the die holes 21 are provided through the through holes 11 formed in the stripper plate 10, respectively.

  Here, the present invention is characterized by the relative positions of the punches 30a and 30b and the die holes 21 corresponding thereto. In the present embodiment, the punches 30 a and 30 b are arranged on the center side in the width direction of the workpiece material 100 with respect to the corresponding die holes 21 according to the distance from the position C corresponding to the center in the width direction of the workpiece material 100. The predetermined distance is shifted. That is, each punch 30a, 30b is provided so that the center axis is shifted to the center in the width direction of the workpiece 100 with respect to the center axis of the corresponding die hole 21. The deviation width between the central axis of each punch 30a, 30b and the corresponding central axis of the die hole 21 is increased in proportion to the distance from the position C to each punch 30a, 30b. In the present embodiment, the deviation width between the punch 30b located on the outer side (the end in the width direction of the work material 100) and the central axis of the die hole 21 corresponding thereto is the inner side (the width direction of the work material 100). It is larger than the deviation width between the central axis of the punch 30a located on the center side and the corresponding central axis of the die hole 21. These deviation widths are determined by considering the length of the workpiece 100 when the workpiece 100 is punched by simultaneously lowering the plurality of punches 30a and 30b, and by the punch 30a and 30b. The central axis of the punching hole 101 formed on the lower surface of the die 100 and the central axis of the die hole 21 are set in advance. Note that these deviation widths may be obtained by actually performing experiments using a conventional punching die or the like, or by performing numerical simulations.

  Thus, by forming the punching die 1, as shown in FIG. 3, when the workpiece 100 is punched by simultaneously lowering the plurality of punches 30 a, 30 b, the punch 30 a, 30 b covers the workpiece. Even if the work material 100 is pressed and extends toward the width direction end, and the leading ends of the punches 30a and 30b are bent toward the width direction end of the work material 100 along with the extension, each punch 30a and 30b are provided so as to be shifted from the corresponding die hole 21 toward the center in the width direction of the work material 100 by a shift width in consideration of the length of the extension. The punching hole 101 can be formed so that the central axis of the punching hole 101 formed on the lower surface coincides with the central axis of the die hole 21. As a result, since the shape of the punching die 1 can be accurately transferred to the work material 100, as shown in FIG. The punching hole 101 can be formed so that the central axis of the punching hole 101 formed on the lower surface coincides with the central axis of the die hole 21.

  Further, by configuring the punching die 1 as described above, the punches 30a and 30b in a state where the center axis of each punch 30a and 30b and the center axis of the die hole 21 coincide with each other on the lower surface of the workpiece 100, and Since the punching hole 101 can be punched by the corresponding die hole 21, it is possible to prevent the bias of the clearance between each punch 30a, 30b and the die hole 21, and to make the clearance uniform. As a result, it is possible to suppress the occurrence of burrs that occur when the punched hole 101 is formed, so that the material to be processed on which the punched hole 101 is formed can be stably mass-produced.

  Furthermore, since this punching die 1 does not add a new component to the conventional punching die, the difficulty in producing the die does not increase. Therefore, by configuring the punching die 1 as described above, the punching die 1 itself can be stably mass-produced.

(Other embodiments)
In the embodiment described above, according to the distance from the position C corresponding to the center of the work material 100 in the width direction (in proportion to the distance from the position C), the work material 100 is compared with the corresponding die hole 21. The punches 30a and 30b are provided while being shifted to the center in the width direction. However, depending on the processing accuracy required for the work material 100, the shift width may not be proportional to the distance from the position C.

  In the embodiment described above, a plurality of punched holes 101 are simultaneously formed in a row (four rows in the first embodiment) along the longitudinal direction at a predetermined distance from the center in the width direction of the rectangular work material 100. However, the present invention is not limited to this. For example, if a plurality of punching holes 101 are simultaneously formed in a row along the longitudinal direction at a predetermined distance from the center in the width direction of the rectangular work material 100, punching holes forming one row or five rows It may be a punching die for molding a plurality of 101 at the same time.

  Further, in the embodiment described above, the material 100 to be processed is not particularly limited. However, when the punches 30a and 30b are lowered at the same time, the length of the material to be extended becomes large, that is, the material has a relatively low hardness and is broken. When punching a metal material having a large elongation, the punching die and the punching method according to the present invention can be suitably used. This is because such a material has a large length of extension when the punches 30a and 30b are simultaneously lowered, and thus the above-described problem appears remarkably.

1 is a schematic view of a workpiece material according to Embodiment 1. FIG. 1 is a schematic cross-sectional view showing a punching die according to Embodiment 1. FIG. It is a schematic sectional drawing at the time of punching using the punching die concerning Embodiment 1. It is a schematic sectional drawing at the time of punching using the punching die concerning Embodiment 1. It is a schematic sectional drawing at the time of punching using the conventional punching die. It is a schematic sectional drawing at the time of punching using the conventional punching die. FIG. 7 is an enlarged schematic view of a portion X shown in FIG. 6.

Explanation of symbols

  1 punching die, 10 stripper plate, 11 through hole, 20 die plate, 21 die hole, 30a, 30b punch

Claims (3)

In a punching die in which a rectangular work material is placed on a die plate in which a plurality of die holes are formed, and a plurality of punches are simultaneously lowered from above through a stripper plate to punch the work material, The die holes are provided in a row along the longitudinal direction of the material to be processed at a predetermined distance from a position corresponding to the center in the width direction of the material to be processed, and the punches correspond to the corresponding die holes. A punching die having a predetermined distance shifted to the center in the width direction of the work material. The punch is provided at a predetermined distance on the center side in the width direction of the work material with respect to the corresponding die hole in accordance with a distance from a position corresponding to the width direction center of the work material. The punching die according to claim 1, wherein: A rectangular workpiece material is placed on a die plate in which a plurality of die holes are formed, and a plurality of punches are lowered simultaneously through the stripper plate from above to form a plurality of punched holes in the workpiece material. In the punching method, the width of the work material with respect to a plurality of die holes arranged in a row along the longitudinal direction at a predetermined distance from a position corresponding to the center in the width direction of the work material. The punches arranged with a predetermined distance shifted to the center in the direction are respectively lowered, and the work material is arranged in a row along the longitudinal direction at a predetermined distance from a position corresponding to the center in the width direction. A punching method for simultaneously forming a plurality of punched holes to be arranged.

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