JPH10314860A - Die for punching printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase die strength, to prevent the die from being damaged, and to prolong the life of the die by mounting a blade cutting and segregating slugs on the floor plate of a lower die. SOLUTION: The printed board P is positioned and held on the upper surface of the piercing punch 41 of the lower die 40, and the piercing punch 41, a stripper plate 42 and the floor plate 43 are provided. Further, the die is composed of a die holder 46 holding the whole of the lower die 40. To cut and segregate slugs punched in slit holes with long sizes and slender widths, and to segregate the slugs by the five blades 45 into six divisions, U-grooves are formed in places up to 5 mm in depth from the front surface of the floor plate 43, and the blades 45 are force-fitted into the U-grooves, and are fixed. Consequently, the removing treatment of the punched slugs is made simple, and by force-fitting the five blades 45 into the inside of the front surface of the floor plate 43, the compressive strength of the whole lower die 40 is increased other than the strength of the floor plate 43. Since the punching can be per-formed by one shot, one die for punching the printed board is enough.

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 circuit board, and more particularly to a die for punching a long and narrow slit having a large number of slit holes, thereby preventing defective finishing of the punched hole and damage to the die. The present invention relates to a die for printing a printed circuit board.

[0002]

2. Description of the Related Art Conventionally, circuit conductors, solder resists,
A round hole 12, a normal slit hole 13, and an outer shape 14 of a printed circuit board as shown in FIG. 3 on which marking, metal plating, etc. are formed are usually formed by a printed circuit board punching die mounted on a press machine. Performs punching in one shot (also called a process). However, the punching of the long and narrow slit holes 15 is performed in two shots.

Next, a die for punching a printed circuit board generally used for one-shot processing will be described with reference to FIG. First, the upper mold 50 guides the punch arrow 55 to the correct position, and moves the shedder 51 up and down while protecting it.
An outer peripheral punching die 52 that guides the entire outer periphery of the shedder 51 in a horizontal direction and a punch plate 53 that positions and fixes a punch arrow 55 for punching holes in a printed board in the horizontal and vertical directions. The entire upper mold is held by a punch holder 54. The upper die 50 is attached to an upper die holder of a slide mechanism of a press machine.

[0004] Details of the lower mold 40 will be described with reference to FIGS. 4 and 3. The printed circuit board P is positioned and held on the upper surface of the lower mold 40, and the desired round hole 1 is formed with the upper mold 50.
2. A punching punch 41 for punching out the normal slit hole 13, the outer shape 14 of the printed circuit board, and the like, and positioning of the entire outer periphery of the punching punch 41 in the horizontal direction to guide the vertical movement. Further, a stripper plate 42 for separating the outer peripheral edge material Q punched from the printed circuit board P from the effective printed circuit board portion and for flipping it up, a punching punch 41 called a lower blade type and a stripper plate 42
And a die holder 46 for holding the entire lower die 40. The die holder 46 of the lower mold 40 is attached to the bolster part of the press machine to fix the entire lower mold 40, and the upper mold attached to the upper mold holder of the vertical slide mechanism of the press machine. The mold 50 moves up and down to make a round hole 12, a normal slit hole 13 in the printed board P installed at a correct position on the upper surface of the punching punch 41 in the lower mold 40, and the outer shape 14 of the printed board P. Are punched.

However, as shown in FIG. 3, a single long and narrow slit hole 15 in which the length 1 of the slit hole is 50 mm or more and the width w of the slit hole is 2 mm or less, In the case of a die for punching a printed circuit board P having a long and narrow slit hole 15 in which adjacent narrow slit holes 15 are set in parallel, a first punching die and a second die for punching are used. The press die of two shots (processes) is performed by dividing the die into two die of die for punching. One of the long and narrow slit holes 15 is partially divided, and the long and narrow slit holes 15 set adjacently in parallel alternately with the first punching die. A printed circuit board punching die is manufactured by dividing the die into a second punching die, and the printed board P is punched by two shots to increase the strength against punching impact and pressure resistance of the die. Of the printed circuit board P, and punching of the long and narrow slit hole 15 is performed.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method for punching a printed circuit board P having a large number of long and narrow slit holes 15 and a plurality of long and narrow slit holes arranged adjacently in parallel. When punching with a mold, long and narrow slit hole 1
5 is partially divided into two molds and arranged,
To arrange the two or more long and narrow slit holes 15 arranged in parallel in two different molds,
Although the problem of mold breakage due to insufficient pressure resistance of the mold is solved, many other problems remain, such as the finished accuracy of punched holes, positional accuracy, related dimensional accuracy, poor sectional state of finished holes, and poor appearance. I have. Furthermore, since the punching process is performed in two shots, the working efficiency is low, and the above-described defective precision and hole cross-sectional defect of the long and narrow slit hole 15 are 20 to 30%.
And many more.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a printed board punching die for press-punching a printed board P on which circuit conductors, metal plating, etc. are formed is an upper mold. 50 and the lower mold 40,
The lower mold 40 is provided with a punch 41, a stripper plate 42, and a floor plate 43. A cutting tool 45 is provided inside the upper surface of the floor plate 43 for cutting and dividing the punched residue of the long and narrow slit hole 15.

Alternatively, the same purpose can be achieved even if a cutting tool 45 for cutting and dividing the punched residue of the long and narrow slit hole 15 is provided inside the lower surface of the punch 41. .

In other words, the cutting tool 45 may be incorporated into the intermediate portion between the punch 41 and the base plate 43. In general, the base plate 43 is made of a soft material having a hardness such as carbon steel or carbon tool steel, which is a metal material called a base material. Although a padding material is used, the punching punch 41 uses a blade material, and a hard material such as an alloy tool steel or a high-speed tool steel is used as a metal material. May be.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In the present invention, as shown in FIG. 3, a printed circuit board P in which the following specification conditions are specified in particular, the length l of the slit hole l = 233 mm, and the width w of the slit hole
= 1 mm, slit hole pitch = 6.8 mm, number of parallel slit holes = 9, plate thickness = 1.0 mm, printed circuit board dimensions = 248
The embodiment of the present invention will be described in detail in consideration of the case of setting of × 77 mm.

In the die for punching a printed circuit board of the present invention,
As for the upper mold 50, as shown in a structural sectional view for explaining a printed board punching mold in FIG. 4, a shedder for guiding a punch arrow 55 incorporated in a punch plate 53 of the upper mold to a correct position while protecting the punch arrow 55. 51 and printed circuit board P
And an outer peripheral punching die 52 for positioning in the horizontal direction over the entire outer periphery of the above-mentioned shedder 51, and for guiding during vertical movement, a round hole 12 and a normal slit hole 1.
3. A conventional upper die 50 provided with a punch plate 53 for positioning and fixing a punch arrow 55 for punching a long and narrow slit hole 15 in a horizontal direction and a vertical direction.
It is.

The lower mold 40 of the present invention will be described with reference to FIG. The printed circuit board P is positioned and held on the upper surface of the punch 41 of the lower mold 40, and is used to remove the round hole 12, the normal slit hole 13, the long and narrow slit hole 15 shown in FIG. A punching punch 41, a stripper plate 42 for separating an outer peripheral material Q punched from the printed circuit board P from an effective printed circuit board portion and raising the same, and a floor plate for supporting and holding the punching punch 41 and the stripper plate 42. 43 and a die holder 46 for holding the entire lower mold 40.

The bottom plate 43 of the lower mold 40 is made of carbon steel S55C having excellent machinability, flexibility and pressure resistance.
Alternatively, carbon tool steel SK3 is used. The thickness of the metal material of the floor plate 43 is 20 mm. A long and narrow slit hole 15 having a length of l = 233 mm and a punched residue of 30 to 50 mm
A U-shaped groove is formed at a depth of 5 mm from the upper surface of the floor plate 43 in order to cut into a length of 5 mm and divide into six with five blades 45, and the U-shaped groove has a thickness of 1. A cutting tool 45 having a size of 5 mm, a width of 5 mm and a length of 100 mm is press-fitted and fixed.

The material of the cutting tool 45 is a high-speed tool steel SKH51 having a high hardness and a metal material of Rockwell hardness HRC 60 ° to 62 ° or a metal material of high-speed steel. The cutting tool 45 is used. As described above, the chip that has been punched in a long dimension (l = 233 mm) is divided into six pieces, cut into pieces each having a length of about 40 mm, and divided, so that the chip removal processing is simplified, and the thickness × width × length = 15 × 5 × 10
By press-fitting five 0 mm cutting tools 45 into the upper surface of the floor plate 43, the lower die 40 as a whole is improved in pressure resistance in addition to the strength of the floor plate 43.
A die for punching a printed circuit board is sufficient.

[0015]

Embodiment 1 Embodiment 1 of the present invention has been described in the above-mentioned embodiment based on FIG. 1. However, Embodiment 2 will be described with reference to FIG. The specifications of the cutting tool 45 for cutting and dividing the punched residue of the long and narrow slit hole 15 are shown below. Material of the cutting tool 45: high-speed tool steel SKH51 Dimension of the cutting tool 45: thickness × width × length = 1.5 × 5 × 100
mm Cross-sectional shape of the cutting edge of the cutting tool 45: mountain shape Number of cutting tools 45: 5 A U-shaped groove having a depth of 5mm is formed on the lower surface of the punch 41 having a thickness of 15mm made of a metal material by a milling machine or an electric discharge machine.
The cutting tool 45 of the above specification is pressed into the U-shaped groove inside the lower surface of the punch 41 and fixed.

[0016]

The effects of the present invention are as follows. 1. The length l of the slit hole in the printed circuit board is 50 mm or more,
Long, narrow slit hole 1 with a slit hole width w 2 mm or less
The stamping press process of No. 5 is performed by a single die for punching a printed circuit board, and can be satisfactorily performed without clogging of chips. 2. By attaching a cutting tool 45 for cutting and dividing the chip to the bottom plate 43 or the punching punch 41 of the lower mold, the strength of the mold is increased, the damage of the mold is prevented, and the mold life is extended 3 to 5 times as compared with the conventional case. . 3. Conventionally, by attaching the cutting tool 45,
Two-shot press punching with two dies can be performed by one-shot press punching with one die. 4. Poor precision and poor appearance of the long and narrow slit hole 15 are greatly reduced to 1/8 to 1/10 of the conventional size, and the quality is stabilized.

[Brief description of the drawings]

FIG. 1 is a structural sectional view of a lower die for punching a printed circuit board according to a first embodiment of the present invention.

FIG. 2 is a structural sectional view of a lower die for punching a printed circuit board according to a second embodiment of the present invention.

FIG. 3 is a plan view illustrating a printed board after punching.

FIG. 4 is a structural sectional view of a conventional printed circuit board punching die.

[Explanation of symbols]

P: Printed circuit board Q: Outer edge material l: Slit hole length w: Slit hole width 12: Round hole 13: Slit hole 14: Printed circuit board outer shape 15: Long and narrow slit hole 40: Lower metal Mold 41: punch punch 42: stripper plate 4
3 ... Sill plate 45 ... Cutting tool 46 ... Die holder 50 ... Upper mold 51 ... Shedder
52: die for outer periphery 53: punch plate 54: punch holder 55:
Punch arrow

Claims (2)

[Claims] 1. A die for punching a printed circuit board for press-punching a printed circuit board on which circuit conductors, metal plating, etc. have been formed, comprising a punch (41), a stripper plate (42), and a floor plate (43). ), A cutting tool (45) is provided in the upper surface of the floor plate (43) for cutting and dividing the punched residue of the long and narrow slit hole (15). A die for punching a printed circuit board. 2. A cutting tool (45) according to claim 1, wherein a cutting tool (45) for cutting and dividing the punched residue of the long and narrow slit hole (15) is provided inside the lower surface of the punch (41). A die for printed circuit board punching.