JPH0262335B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mold used for punching a laminate.

A laminate plate punched using this type of die and having holes formed therein can be effectively used as a printed circuit board or the like.

(Prior art) Figure 1 shows the structure of a conventional mold. In the figure, 1 is a laminate, 2 is a die, 3 is a stopper plate, and 4 is a punch. It is inserted between a die 2 and a stopper plate 3, and a punch 4 is lowered by hydraulic pressure to punch a hole in the laminate.

FIG. 2 shows a conventional punch 4, and FIG. 3 shows a state in which a hole is punched in a laminated plate 1.

(Problems to be Solved by the Invention) In the conventional mold as described above, when a laminate is simply punched with a rod-shaped punch, there is a problem that the hole diameter becomes non-uniform as shown in FIG. Furthermore, since the laminate is held down by the stopper plate when the punch is pulled out, a large stress is generated in the laminate, which tends to cause cracks and delamination.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a die for punching a laminate, which can improve the above-mentioned drawbacks, can make the diameter of the punching hole uniform, and is free from the risk of cracking or delamination in the laminate.

(Means for Solving the Problems) An object of the present invention is to provide an inwardly constricted relief portion 9 between a columnar main body 8 and a punched portion 10, and to provide a relief portion 9 at an end face of the punched portion 10. A punch 4 provided with a turning blade 11 on the side, and the punch 4
an upper die 2' having a hole through which it can be inserted in the vertical direction;
A laminate plate characterized by comprising a stopper plate 3 capable of holding the laminate plate 1 between it and an upper die 2', and a lower die 6 supported with a spring 7 interposed between it and the upper die 2'. This is accomplished using a punching die.

(Function) In the die for punching a laminate according to the present invention configured as described above, when a hole is punched, the bulge on the inner surface of the hole can be scraped off with the turning blade 11, and the buffering force of the spring can be reduced. The stress generated in the laminate when the punch is pulled out can be effectively alleviated.

(Example) Fig. 4 shows a die for punching a laminate according to the present invention. In the figure, 1 is a laminate, 2' is an upper die, 3 is a stopper plate, 4 is a punch, and 6 is a lower die. , 7 indicates a spring interposed between the upper die 2' and the lower die 6.

FIG. 5 shows a punch 4 used in the present invention, in which 8 is a cylindrical main body, 9 is a relief part having a sine curve rotating body surface, 10 is a cylindrical punching part,
11 indicates a return blade. In this case, an inwardly constricted relief part 9 is formed between the columnar main body 8 and the punched part 10, and a turning blade 11 is provided on the relief part 9 side at the end face of the punched part 10.

Figure 6 A and B are explanatory diagrams of the operation, and Figure A is the punch 4.
1 shows a state in which the laminate 1 is punched, and in this state, the punch descends to punch a hole 5 in the laminate. Figure B shows a state in which the punch is raised to scrape away the punching waste 12 from the swollen portion of the inner surface of the hole 5 of the laminate 1 with the return blade 11 of the punch.

In addition, a spring 7 is provided between the upper die 2' and the lower die 6 of the mold, and the spring reduces the impact on the laminate 1 when pressing from the back side of the laminate 1 and punching the laminate with the punch 4. , perform a low speed pullout. At this time, the laminate 1 is sandwiched between the stopper plate 3 and the upper die 2', thereby preventing the laminate 1 from cracking or delaminating.

In the above embodiment, the punch 4 is described as having a cylindrical shape, but it goes without saying that the punch 4 is not limited to a circular shape but can also be applied to a polygonal shape.

(Effects of the Invention) According to the die for punching a laminate of the present invention configured as described above, it is possible to punch holes with a uniform diameter in a laminate using a punch, and the laminate can be punched with Since the applied stress can be alleviated and the occurrence of cracks or delamination can be prevented, remarkable effects can be achieved, such as the ability to form extremely high-quality through-holes, especially in laminates used as printed circuit boards.

[Brief explanation of the drawing]

Figure 1 is a simplified explanatory diagram of a conventional die for punching laminates, Figure 2 is a side view of the punch of the same mold, Figure 3 is an explanatory diagram of the state of drilling with the same mold, and Figure 4 is A simplified explanatory view of a die for punching a laminate according to the present invention, FIG. 5 is a side view of a punch of the same die, and FIG. 6 is an explanatory view of the operation of the same die. 1...Laminated board, 2'...Upper die, 3...Stopper plate, 4...Punch, 5...Hole, 6...Lower die, 7...Spring, 8...Main body, 9...Escape Part, 10... Punching part, 11... Return blade, 12
...Removed scraps.

Claims (1)

[Claims] 1. An inwardly constricted relief part 9 is provided between the columnar main body 8 and the punched part 10, and a return blade 11 is provided on the side of the relief part 9 at the end surface of the punched part 10.
a punch 4 provided with a punch 4, an upper die 2' having a hole through which the punch 4 can be inserted in the vertical direction, and a stopper plate 3 capable of holding the laminate 1 between the upper die 2' and the upper die 2'.
and a lower die 6 supported with a spring 7 interposed between the upper die 2' and the upper die 2'.