JPH0129604B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention is directed to a small hole punching method used for punching a large number of small holes in a thin plate during the production of circuit boards for electrical and electronic components such as ICs and connectors. This invention relates to a die for punching holes.

(b) Conventional technology In order to manufacture circuit boards for electrical and electronic components, it is necessary to drill a large number of small holes in a thin plate, and the small holes are generally formed using a press. .
However, in the prior art, when manufacturing various substrates with different relative positions between holes, that is, different hole patterns, a separate mold is used to perform the hole punching operation for each hole pattern. Ta.

(c) Problems to be Solved by the Invention The above prior art has the problem that an expensive mold must be prepared for each hole pattern, and the present invention solves this problem. The purpose of the present invention is to provide a die for punching small holes that eliminates the problem.

(d) Means for Solving the Problems The small hole punching die of the present invention has a bottom frame portion and left and right side frame portions extending upward from the bottom frame portion, and the upper ends of the left and right side frame portions are punched. A frame body is fixed to the lower surface of the holder and a stripper plate is attached to a position below the bottom frame part, and a frame body is provided in the internal space of the frame body and is stacked on the bottom frame part. A plurality of punch grip plates and a spacer which is arranged facing the inner surface of one side frame and is movable in the longitudinal direction of the punch grip plate by operation from the outside of the frame. and a number of punches inserted into each of a number of holes that are drilled at positions aligned with the holes of the stripper plate and the die and that penetrate the plurality of punch grip plates and the bottom frame in the vertical direction. and a first plate whose one end is located at a position separated from the spacer and faces the spacer, and a position at which the plurality of punch grip plates are displaced in the longitudinal direction with respect to the first plate. and a second plate having one end abutting the spacer, and the punch is fixed by causing the movement of the spacer and moving the second plate relative to the first plate. By doing so, the above problems are solved.

(e) Embodiment As shown in FIGS. 1 and 2, the small hole punching die 1 of the illustrated embodiment includes a bottom frame portion 2a and left and right side frame portions 2b extending upward from the bottom frame portion 2a. , 2c. The frame body 2 is fixed to the punch holder 3 by bolting the upper ends of the left and right side frame parts 2b, 2c to the lower surface of the punch holder 3 with bolts 4a, 4b. Further, a bolt 5 is provided at a lower position of the bottom frame portion 2a of the frame body 2.
A stripper plate 6 is attached by a and 5b, and this stripper plate 6 is always urged downward by springs 7a and 7b.

Inside the inner space 8 of the frame body 2, a plurality of punch grip plates 9 are stacked on the bottom frame portion 2a.
and spacers 10 arranged facing the inner surface of one side frame portion 2c are provided. This spacer 10 includes a bolt 11 screwed into the side frame portion 2c.
a, 11b, and by rotating bolts 11a, 11b from the outside of the frame 1, the spacer 10 can be moved in the longitudinal direction of the grip plate 9, that is, in the left-right direction in FIG. It's summery. Further, the plurality of punch grip plates 9 and the bottom frame portion 2a are provided with a large number of holes passing through them in the vertical direction, and a punch 12 is inserted into each of these holes. The above hole is a hole 6 provided in the stripper plate 6 and the die 13.
It is drilled at a position that aligns with a and 13a.

The plurality of punch grip plates 9 described above are
A first plate 9a whose one end (the right end in FIG. 1) is located at a position separated from the spacer 10 and faces the spacer 10, and one end (which is located at a position displaced in the longitudinal direction with respect to the first plate 9a) The second plate 9 whose right end in FIG. 1 is in contact with the spacer 10
Contains b. Therefore, when the bolts 11a and 11b are screwed in from the state shown in FIG. 1 and the spacer 10 is moved to the left, the second plate 9b moves to the left and the first plate 9a and second plate 9b are separated. A relative displacement occurs between. As a result, a shearing force is generated at the contact portion between the punch 12 and the punch grip plate 9, and a holding force for fixing and holding each punch 12 within the punch grip plate 9 is generated. That is, the pressing force when moving the spacer 10 to the left together with the second plate 9b is P,
When the friction coefficient of the contact portion between the punch 12 and the punch grip plate 9 is μ, and the number of punches is Z, a holding force Fi expressed by the following equation is generated per punch.

Fi=μP/Z Therefore, each punch 12 is securely fixed within the punch grip plate 9 by screwing the bolts 11a and 11b.

FIG. 4 shows the above-mentioned mold 1 in a known press 14.
It is shown installed on. This press is designed to cause a slide 17 and a punch holder 3 attached to its lower end to move up and down by rotation of a crankshaft 15 and a flywheel 16. In addition, this press fixes a die holder 18 holding a die 13 (FIG. 1) on a bolster 19, and guide posts 20a, 20b, 20c, 20d penetrating the die holder 18 and extending vertically.
The punch holder 3 is of a type that slides up and down along. The mold 1 is used by being fixed to the lower surface of the punch holder 3 with a stripper plate 6 attached to its lower position.

The mold 1 of the illustrated embodiment has the above-described configuration, and when using it, the bolts 11a and 11b are lightly tightened with the mold 1 removed from the punch holder 3, and each punch 12 is attached to the punch grip. In this state, press the punches 12 upward from below the stripper plate 6 so that the upper end of each punch 12 and the upper surface of the uppermost punch grip plate Align so that they are on the same plane. Next, in accordance with the desired hole-making pattern in the thin plate 21, only the punch to be used for the hole-making operation is moved downward by a slight amount (at this time, the lower end of the punch moved downward is attached to the lower surface of the stripper plate 6). In this state, the bolts 11a and 11b are strongly tightened, thereby strongly pressing the spacer 10 and the second plate 9b to the left (Fig. 1). The punch 12 is firmly fixed within the punch grip plate. In this state, the left and right frame parts 2b and 2c of the frame body 2 are assembled to the state shown in FIG. The hole-drilling work is performed by lowering the mold 1 all together. In addition, as mentioned above, the stripper plate 6 is connected to the spring 7.
a, 7b, and when the slide 17, punch holder 3, and mold 1 descend, the stripper plate 6
also descends. However, after the lower surface of the stripper plate 6 comes into contact with the upper surface of the thin plate 21 placed on the die 13, only the slide 17, punch holder 3, and mold 1 descend against the force of the springs 7a and 7b. The hole is then drilled (see Figure 3).

Note that it is of course possible to create a configuration in which the positioning of each punch corresponding to a desired hole punching pattern in a thin plate is automatically performed by using an XY table, NC control equipment, or the like.

(f) Effects of the Invention As is clear from the above, the small hole punching die of the present invention can be used in a punch grip plate by appropriately selecting a punch that performs a hole punching operation and a punch that does not perform a hole punching operation. can be fixed in place,
When manufacturing various thin plates with different perforation patterns, it is sufficient to simply change the arrangement and fixing state of each punch, which has the advantage of eliminating the need to prepare separate molds for each perforation pattern. .

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing a small hole punching die according to an embodiment of the present invention fixed to a punch holder of a press, Fig. 2 is an explanatory top view of Fig. 1, and Fig. 3 is a lowering of the punch holder. FIG. 4 is a schematic front view showing a state in which the mold is attached to a press, and FIG. 4 is a diagram similar to FIG. 2...Frame body, 2a...Bottom frame part, 2b, 2c...
Left and right side frame parts, 3... Punch holder, 6... Stripper plate, 9... Punch grip plate, 9a... First plate, 9b... Second plate, 10... Spacer, 12 ...Punch, 1
3...Die, 18...Die holder.

Claims (1)

[Claims] 1 It has a bottom frame and left and right side frames extending upward from the bottom frame, the upper ends of the left and right side frames are fixed to the lower surface of the punch holder, and a stripper plate is attached to the lower position of the bottom frame. a frame body shaped like this; a plurality of punch grip plates provided in the internal space of the frame body and stacked on the bottom frame portion; a spacer which is movable in the longitudinal direction of the punch grip plate by an operation from the outside of the frame; a punch grip plate and a number of punches inserted into each of a number of holes vertically penetrating the bottom frame, the plurality of punch grip plates having:
A first plate that is located at a position where one end is separated from the spacer and faces the spacer, and a second plate that is located at a position that is displaced in the longitudinal direction with respect to the first plate and whose one end abuts the spacer. A die for punching small holes, wherein the die is configured to cause the movement of the spacer to cause the second plate to move relative to the first plate, thereby fixing the punch.