JP2000225598A - Die for punching printed wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die for punching a printed wiring board requiring no process of die aligning operation. SOLUTION: A play is reserved in a horizontally directed end joining part between a die holder plate 11 and die support 12 of a lower die member, and the die holder plate 11 is furnished with a bolt shank inserting hole 11p. Also a play is reserved between the internal circumferential wall of this hole 11p and the bolt shank, and the die holder plate 11 and die holder support 12 are fastened together by bolt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for punching a printed wiring board.

[0002]

2. Description of the Related Art A die for punching a printed wiring board is designed so that an outer die and an inner die can be simultaneously punched out. The upper die and the lower die are fixed to a press machine, and the upper die is lowered. Thus, when the lower die is pressed by the upper die, the stripper plate descends to perform press punching.

[0003] Generally, both the lower die and the upper die are fixed. However, when the open height is reached, the lower die guide post is detached from the upper die guide bush due to a long opening distance. As a result of severe impact during rolling or pressing, forces in the vertical and horizontal directions are applied, and even if the upper and lower dies are clamped (fixed), a displacement occurs.
It is necessary to perform a mold matching operation for adjusting the displacement of the upper mold and the lower mold in a free clamp (free) state once per shot.

[0004] However, in addition to the fact that the time of occurrence of the deviation is unpredictable in the first place, the matching requires a considerable amount of time and labor for the work to adjust the subtle deviation, and also requires special skills like craftsmanship. Was required. In particular, in the case of a large number of continuous presses, a large problem such as the occurrence of galling or the like, in which the upper punch and a part of the lower die die collide with each other at the time of pressing due to the misalignment and the cutting edge portion is lost.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and provides a die for punching a printed wiring board, which does not require an upper die and a lower die. The purpose is to.

The inventor of the present invention has conducted various studies to achieve the above object. As a result, the lower die holder plate and the die holder support are bolted to each other so as not to cause displacement. It is said that the more firmly it is fixed, the better it is.It is strictly prohibited to insert even a washer in this kind of mold, but unexpectedly, if it is bolted and fixed so that it can play freely, the impact at the time of press punching It has been found that the displacement of the mold caused by the above is absorbed, and that an extremely good result is obtained, and the present invention has been completed.

[0007]

That is, a die for punching a printed wiring board according to the present invention is a die for punching a printed wiring board comprising an upper die and a lower die. A play gap is formed at the horizontal end joint portion with the holder support, and a bolt shaft insertion hole is formed in the die holder plate, and a play is also provided between the inner peripheral wall of the bolt shaft insertion hole and the bolt shaft portion. The above object has been achieved by forming a gap and fixing the die holder plate and the die holder support by bolting.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below with reference to the drawings showing embodiments of the present invention.

FIG. 1 is a schematic diagram illustrating the configuration of a die for punching a printed wiring board according to the present invention. Referring to FIG. 1, reference numeral 10 denotes a lower die, in which a die holder plate 11 and a die holder support 12 are provided. Although it is bolted and fixed by the bolt 13, a play gap M is formed at the horizontal end joint portion between the die holder plate 11 and the die holder support 12, and a bolt shaft is inserted through the die holder plate 11. A hole 11P is formed, and a play gap N is also formed between the inner peripheral wall of the bolt shaft insertion hole 11P and the shaft of the bolt 13.

The bolt 13 used here may be composed of a bolt head 13a and a bolt shaft portion formed with a threaded thread as a whole, but as shown in FIG. A bolt is used in which the corresponding upper shaft portion is a smooth shaft portion 13b without a screw thread and only the lower shaft portion corresponding to the die holder support 12 portion is a screw shaft portion 13c with a screw thread. This is advantageous in screwing and fixing only the die holder support 12 without fixing.

The specific dimensions of the play gap M at the horizontal end joint and the play gap N at the bolt shaft insertion hole are both preferably about 0.5 mm.

In addition, when bolting and fixing, it is more necessary to interpose a buffer member 14 such as a spring washer or a urethane washer between the lower surface of the bolt head 13a and the upper surface of the die holder plate 11 in terms of shock absorption. preferable.

It is preferable that such bolting and fixing be performed at four or more locations at the four corners of the die holder plate.

Reference numeral 15 denotes a guide post erected on the die holder plate 11, which is guided by a guide bush 21 provided on the upper die 20 when the upper die 20 is lowered, and automatically positions and adjusts a normal position. The specific shape and number of the guide posts 15 are appropriately selected. In addition, 16 is a die plate, 17 is a stripper plate, and 18 is a press clamp, which is provided in the same manner as a conventional mold.

Reference numeral 19 denotes a return-to-origin bolt, which is formed of a knock bolt. A fall prevention spring S is provided at the bottom of the knock bolt hole 12P formed in the die holder support 12.
The die holder plate 11 and the die holder support 12 are connected in a state where is inserted. Incidentally, when the printed circuit board is punched, the origin return bolt 19 loosens the screw fixing with the die holder plate 11 so that the die holder plate 11 can be slid, and press stamping is performed. At the end, the origin of the die holder plate 11 is determined by tightening and screwing it to the die holder plate 11, and then, when punching a printed wiring board with a mold, the origin can always be determined.

If the printed wiring board is punched by using the mold according to the embodiment, the lower mold 10 receives a considerable impact when the upper mold 20 is pressed down, but the play gaps M and N Die holder plate 11
Slides on the upper surface of the die holder support 12, so that the upper and lower dies can always be at the correct position while absorbing the vibration and distortion caused by the impact.

[0017]

According to the present invention, since the upper and lower dies can always be set at the correct positions, there is no need for a mold matching operation requiring labor and special skills. In other words, the life of the mold can be made three times or more longer than before, without the need for the conventional mold matching work, and a long-term stable mass production press can be performed, and the processing accuracy can be significantly improved. it can.

[Brief description of the drawings]

FIG. 1 is a partially cutaway explanatory view showing a schematic configuration of a die for punching a printed wiring board according to the present invention.

FIG. 2 is an enlarged front explanatory view of a bolt.

[Explanation of symbols]

 10: Lower die 11: Die holder plate 11P: Bolt shaft insertion hole 12: Die holder support 12P: Knock bolt hole 13: Bolt 13a: Head 13b: Upper smooth shaft portion 13c: Lower screw shaft portion 14: Spring washer ( 15: Guide post 16: Die plate 17: Stripper plate 18: Press clamp 19: Return to origin bolt 20: Upper die 21: Guide bush M: Gap N: Gap S: Spring

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[Procedure amendment]

[Submission date] November 22, 1999 (1999.11.
22)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

That is, a die for punching a printed wiring board according to the present invention is a die for punching a printed wiring board comprising an upper die and a lower die. A play gap is formed at the horizontal end joint portion with the holder support, and a bolt shaft insertion hole is formed in the die holder plate, so that the bolt shaft insertion hole is not screwed between the inner peripheral wall and the bolt shaft portion. The above object has been achieved by screwing and fixing only the die holder support to a bolt while forming a play gap.

Claims (6)

[Claims] 1. In a die for punching a printed wiring board comprising an upper die and a lower die, a play gap is formed at a horizontal end joint between a die holder plate and a die holder support of the lower die. Then, a bolt shaft insertion hole is formed in the die holder plate, and a play gap is also formed between the inner peripheral wall of the bolt shaft insertion hole and the bolt shaft portion, and the die holder plate and the die holder support are bolted and fixed. A die for punching a printed wiring board. 2. The die for punching a printed wiring board according to claim 1, wherein a buffer member is interposed between the lower surface of the bolt head and the upper surface of the die holder plate, and the bolt is fixed. 3. The die for punching a printed wiring board according to claim 2, wherein the buffer member is a spring washer or a urethane washer. 4. The die for punching a printed wiring board according to claim 1, wherein the bolt is a bolt comprising a head, an upper smooth shaft portion, and a lower screw shaft portion. 5. The printed wiring board punching process according to claim 1, wherein the die holder plate and the die holder support are further connected via an origin return bolt. Mold. 6. The printed wiring board punching process according to claim 5, wherein the origin return bolt comprises a knock bolt, and a spring is inserted into a bottom of the knock bolt hole of the die holder support. Mold.