JP2007030127A - Printed circuit board blanking die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printed circuit board blanking die for precisely blanking small holes at predetermined positions on a printed circuit board, and restraining abrasion of an edge of a die plate without generating burrs on edges of the small holes. <P>SOLUTION: This printed circuit board blanking die 10 comprises: an upper die 11 having a punch plate 2 and a stripper plate 4; and a lower die 12 having a die plate 8, and blanks at least one small hole in the printed circuit board by a punch 3 fixed to the punch plate 2. Presser plates 6 with predetermined thickness are provided on the periphery of or near the side side of a punch projecting hole 7 of a stripper plate 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a printed circuit board punching die for press punching a printed circuit board.

  In recent years, a flexible printed circuit board (hereinafter, also simply referred to as a printed circuit board) has been actively applied to portable electronic devices that require high-density mounting, taking advantage of its thin and light feature. In these portable electronic devices, various electronic components are arranged on a printed circuit board, and a wiring board is bent and incorporated in a usable space, thereby realizing miniaturization and high functionality indispensable for carrying. In this case, it is necessary to accurately position the printed circuit board and incorporate it.

  As a method of accurately incorporating a printed circuit board into an electronic device, it is common to make a small hole in the printed circuit board with high accuracy in advance, and provide a pin on the electronic device side, aligning both with the pin and the small hole, and incorporating it. It is. In order to accurately open such small holes in the printed board in advance, a printed board punching die (hereinafter, also simply referred to as “punching die”) is used.

  An example of a conventional punching die will be described with reference to FIGS. The punching die 20 has an upper die 31 and a lower die 32. The upper die 31 is separated by a punch (blade part) 23, a punch plate 22 that fixes the upper end of the punch 23, a punch holder 21 that fixes the punch plate 22, and the elastic force of the punch plate 22 and the elastic body 25. A stripper plate 24 is provided. The stripper plate 24 has a hole 27 in which the punch 23 protrudes and retracts, while improving the punching efficiency by pressing the printed board A in advance during punching and suppressing the upward movement of the printed board A. The lower mold 32 includes a die plate 28 having a punched hole 29. The punching die 20 includes, in addition to the above components, a guide pin for positioning the upper die 31 and the lower die 32, a guide bush, and a location pin for positioning the printed circuit board A on the die plate 28. .

  In order to punch out the small hole 40 of the printed board A using such a punching die 20, first, the long printed board A is fed onto the die plate 28. After the printed circuit board A is installed at a predetermined position on the die plate 28, a press pressure is applied to the punch holder 21 in the downward direction in the figure. As a result, the punch 23 integrated with the punch holder 21 is lowered, and the stripper plate 24 is lowered against the elastic bias of the elastic body 25. Before punching out the printed circuit board A, the stripper plate 24 reaches the printed circuit board A and presses the printed circuit board A in advance. Subsequently, the punch 23 penetrates a predetermined part of the printed circuit board A. Strong shear occurs at the edges of the punch 23 and the die plate 28, and a small hole 40 is formed at a predetermined position in the printed circuit board A. The punched pieces B of the printed circuit board A are discharged from the punched holes 29 to the outside.

On the other hand, in Japanese Patent Laid-Open No. 10-328755, an L-shaped scissors that can move up and down while maintaining a fitting state with the inner peripheral part of the stripper plate are provided on the outer peripheral part of the punched punch. There is disclosed a structure of a printed board punching die in which a fixing knock pin and a mounting bolt are arranged at a heel portion and fixed to a floor board.
JP 10-328755 A (Claim 1, FIGS. 1 to 3)

  However, in the conventional punching die 20, since the printed circuit board A is pressed by the entire apparent surface of the stripper plate 24 at the time of punching, the press around the small hole 40 to be punched is sweetened. For this reason, there are problems that the small holes cannot be accurately punched at predetermined positions, burrs are generated at the edges of the small holes 40 of the printed circuit board A, and the edges of the die plate 28 and the cutting edge of the punch 23 are easily worn. There was a thing. In addition to the small hole 40, the punching die 20 has a shape of a long and narrow hole or a printed board. The above problem is particularly likely to occur with the small hole 40 having a small size. there were. The printed circuit board punching die described in Japanese Patent Laid-Open No. 10-328755 is for securing a mounting space such as a fixed knock pin when punching a narrow and narrow printed circuit board A. It does not solve the problem of the sweetness of time.

  Accordingly, an object of the present invention is to provide a printed circuit board punching die that punches out small holes in a printed circuit board at a predetermined position with high accuracy, does not generate burrs at the edges of the small holes, and suppresses wear on the edge of the die plate. There is.

  In such a situation, the present inventors have intensively studied, and as a result, in a printed circuit board punching die for punching at least one small hole in the printed circuit board, a predetermined thickness is provided in the vicinity of the die plate side peripheral edge of the punching hole of the stripper plate. If a press plate is attached, a small hole in the printed circuit board is punched out precisely at a predetermined position, and burrs are not generated at the edge of the small hole, and the wear of the edge of the die plate is suppressed. The present invention has been completed.

  That is, the present invention includes an upper die having a punch plate and a stripper plate, and a lower die having a die plate, and punching at least one small hole in the printed board by a punch fixed to the punch plate The present invention provides a die for punching a printed circuit board, in which a pressing plate having a predetermined thickness is attached to a peripheral region on the die plate side of the punching hole of the stripper plate and a region extending in the vicinity thereof.

  According to the printed board punching die of the present invention, when punching, the periphery of the small hole to be punched is pressed by the pressing plate, so that it is punched out with good sharpness. For this reason, a small hole is accurately punched at a predetermined position, and no burr is generated at the edge of the small hole. Furthermore, wear of the edge of the die plate is suppressed.

  Next, a printed circuit board punching die according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view showing a punching die before punching, FIG. 2 is a schematic view showing a punching die after punching, and FIG. 3 is a view of the stripper plate as viewed from the die plate side.

  The printed circuit board punching die 10 has an upper die 11 and a lower die 12. The upper die 11 is separated by a punch (blade part) 3, a punch plate 2 that fixes the upper end of the punch 3, a punch holder 1 that fixes the punch plate 2, and the elastic force of the punch plate 2 and the elastic body 5. A stripper plate 4 is provided.

  The stripper plate 4 has a punch in / out hole 7 through which the punch 3 goes in and out, and a pressing plate 6 having a predetermined thickness is attached to the periphery of the punch in / out hole 7 on the die plate 8 side and the vicinity thereof. The size and shape in plan view corresponding to the peripheral edge of the pressing plate 6 and the region extending in the vicinity thereof are not particularly limited, and examples thereof include a rectangular shape and a circular shape. In the case of a square, the dimension is 4.0 to 6.0 mm, preferably 4.5 to 5.5 mm when the diameter of the small hole is 1.2 mm or less. In the case of a shape other than a rectangular shape such as a square, the maximum dimension corresponding to the peripheral edge and the vicinity thereof is 4.0 to 6.0 mm, preferably 4.5 to 5.5 mm from the center. When the size of the pressing plate 6 is too large, the concentrated pressing force around the small hole to be punched is reduced and the sharpness is not improved. On the other hand, if the size of the pressing plate 6 is too small, the pressing area becomes small, and the printed circuit board A may not be positioned accurately. Further, the presser plate 6 has a punch in / out hole 61 through which the punch 3 in / out. The cross-sectional shape of the punch in / out hole 61 is the same as the cross-sectional shape of the punch in / out hole 7 of the stripper plate 4. That is, it is preferable that the punching hole 61 of the presser plate 6 has a size that is as close as possible to the shape of the small hole, while allowing the punch to move freely without resistance.

  The thickness of the pressing plate 6 is not particularly limited as long as it is a thickness that comes into contact with the printed circuit board surface prior to the stripper plate 4 when punching, but is specifically 0.5 to 2.0 mm, preferably 0.7 to 1. .8 mm. If the thickness of the pressing plate 6 is too thin, the horizontal position of the upper mold and the lower mold may be slightly deteriorated, and the pressing plate 6 may not first contact the predetermined position of the printed circuit board A, which is not preferable. . The material of the pressing plate 6 may be the same material as the stripper plate 4. Further, examples of the method of attaching the pressing plate 6 to the stripper plate 4 include a method by integral processing, a method of fixing each other by adhesion or welding with an adhesive, etc. Of these, the method by integral processing is obtained with high accuracy. Is preferable. As a method by integral processing, a method of scraping the stripper plate 4 with a milling cutter can be mentioned. By installing the presser plate 6 on the stripper plate 4, when punching, the periphery of the small hole 13 to be punched out of the printed circuit board A and the vicinity thereof can be pressed intensively and the sharpness is improved. For this reason, the small hole 13 is accurately punched at a predetermined position, and no burr is generated at the edge of the small hole 13. Furthermore, wear of the edge of the die plate is suppressed.

  The small holes 13 to be punched into the printed board A are not particularly limited, and are usually circular small holes 13. The circular diameter is 1.5 mm or less, preferably 0.5 mm or more and 1.2 mm or less. In the case of the small hole 13 having such a size, without the pressing plate 6, the pressing force around the small hole 40 to be punched becomes sweet, and thus the above-described various problems such as not being able to accurately punch the small hole at a predetermined position. appear. The cross-sectional shape of the punch 3 and the shape of the punch in / out hole 7 are determined according to the shape of the small hole 13.

  In the printed board punching die 10, the lower die 12 includes a die plate 8 having a punching hole 9. In addition to the above-described components, the punching die 10 usually includes a guide pin for positioning the upper die 11 and the lower die 12, a guide bush, a location pin for positioning the printed circuit board A on the die plate 8, and the like. There is. However, in the case of a multi punch type punched out by image processing, these guide pins are usually not provided. Further, the printed board punching die 10 may be one that simultaneously punches the long and narrow holes and punches the outer shape of the printed board in addition to the punching of the small holes 13 of the printed board A.

  In order to punch the small hole 13 of the printed board A using such a punching die 10, first, the printed board A having a long shape, a short shape, or a rectangular shape is fed onto the die plate 8. After the printed circuit board A is installed at a predetermined position on the die plate 8, a press pressure is applied to the punch holder 1 in the downward direction in the figure. As a result, the punch 3 integrated with the punch holder 1 is lowered, and the stripper plate 4 is lowered against the elastic bias of the elastic body 5. Immediately before punching out the printed circuit board A, the pushing plate 6 of the stripper plate 4 reaches the printed circuit board A and intensively presses the vicinity of the printed circuit board A surrounding the planned punched portion. Subsequently, the punch 3 penetrates the printed circuit board A. At this time, the outer shape of the small hole of the printed circuit board A is positioned between the punch 3 and the edge of the die plate 8 with high accuracy and the printed circuit board is stably suppressed. A small hole 13 is formed at a predetermined position. The punched piece B of the printed circuit board A is discharged from the hole 9 to the outside.

  According to the punching die 10 of the present embodiment, when punching, the periphery of the small hole to be punched is pushed by the pressing plate, so that it is punched out sharply. For this reason, a small hole is accurately punched at a predetermined position, and no burr is generated at the edge of the small hole. Furthermore, wear of the edge of the die plate is suppressed.

  EXAMPLES Next, although an Example is given and this invention is demonstrated more concretely, this is only an illustration and does not restrict | limit this invention.

  As shown in FIGS. 1 and 2, the flexible printed circuit board was continuously produced using a punching die having the following specifications. The evaluation was based on the number of times until the edge maintenance of the die plate was necessary in continuous production and the presence or absence of burrs around the edge of the small hole. As a result, Example 1 was 100,000 times, and no burrs were generated around the edges of the small holes. In the case of the conventional punching die as shown in FIGS. 4 and 5, the continuous number of times was 10,000 times, and the continuous production increased dramatically.

(Punching die)
・ Small hole diameter: 0.8 mm, the number of holes in the small hole is two places ・ Presser plate: A plate-like object having a punch in / out hole with an inner diameter of 0.8 mm and a side of 5 mm × 5 mm thickness (step) of 1.5 mm, Same material as stripper plate

  The same procedure as in Example 1 was performed, except that a printed circuit board in which the dimension between the two small holes was further increased by about 5 mm was produced. As a result, Example 2 was similarly 100,000 times, and there was no occurrence of burrs around the edge of the small hole.

It is a schematic diagram which shows the punching die before punching. It is a schematic diagram which shows the punching die after punching. It is the figure which looked at the stripper plate from the die plate side. It is a schematic diagram which shows the punching die before the conventional punching. It is a schematic diagram which shows the punching die after the conventional punching.

Explanation of symbols

1,21 Punch holder 2,22 Punch plate 3,23 Punch (blade)
4, 24 Stripper plate 5, 25 Elastic body 6 Presser plate 7, 27, 61 Punch retract hole 8, 28 Die plate 9, 29 Punch hole 10, 20 Punching die 11, 31 Upper die 12, 32 Lower die 13, 40 Small hole

Claims (3)

  A printed board punching die comprising an upper mold having a punch plate and a stripper plate, and a lower mold having a die plate, and punching at least one small hole into the printed board by a punch fixed to the punch plate, A printed circuit board punching die, wherein a pressing plate having a predetermined thickness is attached to a peripheral area on the die plate side of the punch in / out hole of the stripper plate and the vicinity thereof.   The printed board punching die according to claim 1, wherein the small hole is a circular hole. The printed board punching die according to claim 1 or 2, wherein the pressing plate has a thickness of 0.5 to 2.0 mm.

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