JP-7856308-B2 - Punching device and punching method

JP7856308B2JP 7856308 B2JP7856308 B2JP 7856308B2JP-7856308-B2

Inventors

永尾暁
白山啓介
渡邊彬央

Assignees

株式会社ファインテック

Dates

Publication Date: 20260511
Application Date: 20220922
Priority Date: 20220106

Claims (7)

It comprises cylindrical punching blades arranged in a row, and a die section into which the punching blades punch and fit the workpiece, In the direction of the arrangement of the punching blades, the two or more punching blades are divided into groups with a difference in height, Among the aforementioned groups, the height difference between the cutting edge of the group that contacts the workpiece and the cutting edge of the next group that contacts it is less than or equal to the thickness of the workpiece. A punching device in which the height difference between the cutting edge of the group that contacts the workpiece and the cutting edge of a group that contacts the workpiece two or more times after the group that contacts the workpiece is greater than the thickness of the workpiece.
The punching apparatus according to claim 1, wherein, in the operation of punching out the workpiece, the height difference between the cutting edge of the first group of cutting edges that contacts the workpiece and the cutting edge of the second group that contacts it next is less than or equal to the thickness of the workpiece, and the height difference between the cutting edge of the first group and the cutting edge of the third group that contacts the workpiece after the second group is greater than the thickness of the workpiece.
The punching apparatus according to claim 1 or 2, wherein the height difference between the cutting edge of the group that contacts the workpiece and the cutting edge of the next group that contacts the workpiece is less than the thickness of the workpiece.
The punching apparatus according to claim 1, wherein the groups that first contact the workpiece and the groups that last contact the workpiece are arranged in order.
The die portion is provided with a fixing portion for fixing the die portion, The punching apparatus according to claim 4, wherein the punching blades are arranged in groups that contact the workpiece in order from the fixed portion side.
The fixing portions are formed at both ends in the longitudinal direction of the die portion. The punching apparatus according to claim 5, wherein the punching blades are arranged in groups that sequentially contact the workpiece from both ends toward the center.
In a punching method using a punching device comprising cylindrical punching blades arranged in a row and a die section into which the punching blades punch and fit the workpiece, In the direction of the arrangement of the punching blades, the two or more punching blades are divided into groups with a difference in height, A punching method in which, among the aforementioned groups, the height difference between the cutting edge of the group that contacts the workpiece and the cutting edge of the next group that contacts it is less than or equal to the thickness of the workpiece, and the height difference between the cutting edge of the group that contacts the workpiece and the cutting edge of a group that contacts the workpiece two or more groups after the group that contacts the workpiece is greater than the thickness of the workpiece.

Description

This invention relates to a punching apparatus and a punching method for manufacturing products by punching out a workpiece with a punching blade. Punching devices are known that punch holes of a predetermined shape into a workpiece or punch out predetermined shapes from a workpiece. Because punching devices punch many holes at once or punch out many pieces from a workpiece, they are equipped with many punching blades and a die with the same number of holes into which the punching blades fit after punching out the workpiece. For example, the mold for forming an opening and the method for forming an opening in an insulating substrate using the same, as described in Patent Document 1, comprises a first punching member provided with a plurality of columnar punches for opening a predetermined position in the insulating substrate, and a second punching member provided with an opening at a position corresponding to the punches on the first punching member. The first punch is at a height from a reference plane, and the second punch is at a height different from that of the first punch. The height difference between the first and second punches is greater than or equal to the thickness of the insulating substrate in which the via hole is formed. The IC card manufacturing method and IC card described in Patent Document 2 are configured such that, when punching out multiple card shapes using multiple cutting blades, at least one of the cutting blades starts cutting the card base material before the other cutting blades, and the punching speed of at least one of the simultaneously operating cutting blades is different from that of the other cutting blades. In this IC card manufacturing method, while most IC cards commonly found on the market are around 760 μm to 800 μm thick, it is stated that a thickness of 1000 μm or less is preferable, and 500 μm or less is even preferable, because if the difference in the height of the punching blades is too large, misalignment of the punching position will occur. Furthermore, Patent Document 2 illustrates examples of punching blade heights, such as height differences of 500 μm or 250 μm between punching blades, increasing them by 50 μm each to create a total height difference of 100 μm, or increasing them by 150 μm each to create a total height difference of 300 μm. Japanese Patent Publication No. 2002-239991Japanese Patent Publication No. 2006-218598 This is a perspective view showing a punching device according to an embodiment of the present invention.Figure 1 shows the upper die of the punching machine, viewed from the punching blade side.Figure 2 is a front view of the upper type.Figure 1 shows an exploded perspective view of the lower die plate and die holder.Figure 1 is a perspective view of the stripper plate of the punching machine shown.Figures (A) to (C) are diagrams illustrating the punching state for each group of punching machines shown in Figure 1.This diagram illustrates another example of elevation differences within a group. A punching device according to an embodiment of the present invention will be described based on the drawings. The punching device 10 shown in Figure 1 punches out circular products from a sheet of workpiece. The punching device 10 comprises an upper die 20, a lower die 30, and a stripper plate 40. As shown in Figures 1 and 2, the upper die 20 includes a blade holder 21, a guide post 22, and a punching blade 23. The blade holder 21 is a plate that holds the base end of the punching blade 23 in an aligned state. The blade holder 21 is also a plate that is pressed by a press machine. The guide post 22 is a rod-shaped member that guides the descent of the upper mold 20 by being inserted into the guide hole 32 of the lower mold 30 when the upper mold 20 descends. The punching blade 23 shown in Figure 2 is a cylindrical cutting tool (cutter) with a circular cutting edge formed at its tip. In this embodiment, the diameter of the punching blade 23 is 9.0 mm. The punching blades 23 are arranged in a row along the longitudinal direction F1 and also along the short direction F2, forming a rectangular shape. Two punching blades 23 are arranged along the short direction F2, and 28 are arranged along the longitudinal direction F1. As shown in Figures 2 and 3, the punching blades 23 are arranged in such a way that two blades aligned along the short direction F2 have equal cutting edge heights, while the 28 blades aligned along the long direction F1 are divided into groups with varying heights. In this embodiment, the punching blades 23 are divided into 13 groups along the long direction F1 according to cutting edge height, and into 7 groups according to different cutting edge heights. For example, groups A, B, C, D, E, and F at both ends of the longitudinal direction F1 are divided into two sections each, while group G in the central section is divided into four sections. In this way, each group contains two or more punching blades 23 with the same cuttin