JPH07276295A - Punching processing method for sheet material - Google Patents

Abstract

PURPOSE:To provide the punching processing method for a sheet material by which punching waste in a hole can be removed surely without the need of adding a special device. CONSTITUTION:First, a ceramic green sheet 2 is mounted on a die 3, and a hole 2a is formed by moving in reciprocation a punch 1 toward the die 3 and punching the ceramic green sheet 2. Afterwards, the punch 1 is descended further, and is inserted into the hole 2a. By doing this, in the hole 2a, air existing in a space 5 between the tip portion of the punch 1 and a punching scrap 2b is compressed, and the punching scrap 2b is blown away downward by this compressed air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic sheet punching method for punching a sheet material such as a ceramic sheet used for an electronic circuit board to form holes. By reciprocating a plurality of times, the punching scraps are prevented from remaining in the holes.

[0002]

2. Description of the Related Art Holes are formed in a ceramic green sheet (ceramic sheet) used as an electronic circuit board by punching. Electrical circuit board
It is manufactured by forming a predetermined pattern wiring on the thus-perforated ceramic green sheet by printing or the like, stacking a plurality of ceramic green sheets, and then firing.

Incidentally, the punching dust generated by the punching process is usually sucked by a dust collector or the like, but the punching dust may remain in the hole and cause a defect.
It is considered that the punching dust remains in the holes as follows. That is, the punch dust adheres to the tip of the punch due to the pressure during the punching process, and when the punch rises, the punch dust adheres to the inner surface of the hole. Further, since the inside of the hole has a negative pressure when the punch rises, the punching dust once pushed out of the hole by the punch may be sucked into the hole and block the hole.

In order to remove punching dust remaining in the holes, a punching device is conventionally provided with a hollow member (stripper) through which the punch can be inserted, and compressed air is blown from the hollow member into the hole formed by the punch. It has been proposed to blow a punch to push out punching waste (Japanese Patent Laid-Open No. 2-1751).
04). Further, a method has also been proposed in which suction means is provided on the die side of the punching device to suck the punching dust remaining in the hole (JP-A-3-190705).

[0005]

However, in the technique disclosed in Japanese Patent Laid-Open No. 2-175104, it is necessary to blow compressed air into the hole through the hollow member, so that the mechanism on the punch side of the apparatus is complicated. become. Further, since the length of the punch is increased by the thickness of the hollow member, there is a drawback that the punch is easily broken when forming a hole having a small diameter.

On the other hand, the method disclosed in Japanese Patent Laid-Open No. 3-190705 has a problem that it is difficult to secure a strong suction force for sucking and removing the punching dust remaining in the hole.

The present invention has been made in view of the above problems, and provides a punching method for a sheet material, which does not require the addition of a special device and can reliably remove the punching scraps in the holes. The purpose is to do.

[0008]

A method of punching a sheet material according to the present invention comprises a step of placing a sheet material between a punch and a die of a punching device, and a reciprocating motion of the punch toward the die. It is characterized by including a step of punching a material to form a hole, and a step of reciprocating the punch toward the die to insert the punch into the hole.

[0009]

In the present invention, the ceramic sheet is punched out to form a hole, and the punch is further reciprocated to insert the punch into the hole. Then, as the tip of the punch descends in the hole, the air between the punch tip and the punching dust is compressed, and the compressed air blows off the punching dust that closes the hole.
Even if the punched dust is not blown off by the compressed air, the punched dust is pushed out by the tip of the punch below the hole. At this time, since the contact pressure between the punch and the punch dust is small, the adhesive force of the punch dust on the punch is weak, and when the punch changes its moving direction from the lower side to the upper side, the punch dust is moved from the punch tip by the inertial force. break away.

[0010]

Embodiments of the present invention will now be described with reference to the accompanying drawings.

1 to 7 are schematic cross-sectional views showing, in the order of steps, a method for punching a ceramic sheet according to an embodiment of the present invention. First, as shown in FIG. 1, the ceramic green sheet 2 is placed at a predetermined position on the die 3 of the punching device. The punching device includes a die 3, a punch 1 and a head 4.
The punch 1 is supported by a head 4, and the head 4 is driven by a driving device (not shown) to move in the vertical direction. Further, the die 3 is provided with holes 3a having a diameter slightly larger than the diameter of the punch 1 in correspondence with the positions of the holes to be formed in the ceramic green sheet 2. The sheet material is a drive device (not shown).
It is driven by and is moved in the front-back and left-right horizontal directions.

Next, as shown in FIG. 2, the head 4 is lowered and the ceramic green sheet 2 is punched by the punch 1 to form the hole 2a. By this punching process,
Punching waste 2b is generated. As shown in FIG. 3, this punching waste 2b is usually pushed out below the die 3 by the tip of the punch 1 and is sucked by a dust collector or the like as in the conventional case. However, as shown in FIG. 4, the punching scraps 2b once extruded below the hole 2a may enter the hole 2a and block the hole 2a as the punch 1 rises.

Therefore, in the present embodiment, as shown in FIG. 5, the head 4 is lowered again and the tip of the punch 1 is inserted into the hole 2a. Then, the air existing in the space 5 between the tip of the punch 1 and the punching dust 2b is compressed, and the compressed air blows the punching dust 2b below the die 3 as shown in FIG. Even if the punching dust 2b is not blown off by the compressed air, the punching dust 2b is pushed out by the tip of the punch 1 below the hole 2a. In this case, the contact pressure between the punch 1 and the punching dust 2b is extremely smaller than the pressure at the time of punching, and therefore the adhesive force of the punching dust 2b to the punch 1 is sufficiently small. Therefore, when the punch 1 changes its moving direction from downward to upward,
The punching chips 2b easily fall off the punch 1 due to the inertial force.

Then, as shown in FIG. 7, after the punch 1 is raised to a predetermined position, the driving device moves the ceramic green sheet 2 in the horizontal direction to form a hole at the next position. In this way, holes are sequentially formed at predetermined positions of the ceramic green sheet.

In this embodiment, as described above, the punch 1 reciprocates twice at the same position of the ceramic green sheet 2, so that the holes 2 formed in the ceramic green sheet 2 are reciprocated.
It is possible to reliably prevent the punching scraps from remaining in the inside of a. Further, in the present embodiment, since no special device such as compressed air supply means is required, the device configuration is simple and the device can be downsized. Furthermore, in this embodiment, since the punch 1 is continuously reciprocated twice with respect to the same position of the ceramic green sheet, there is no horizontal movement of the die 3 or the head 4 during that time, and the punch 1 of the second time is not moved. When reciprocating, the punch 1 can be accurately inserted into the hole 2a. As a result, it is possible to avoid the displacement of the holes and the breaking of the punch.

In this embodiment, the punching of the ceramic sheet has been described, but the present invention can be applied to a method of processing other materials such as a resin film.

[0017]

As described above, according to the present invention, after the holes are formed in the sheet material by the punches, the punches are further inserted into the holes, so that the punching wastes closing the holes are surely removed. can do. Further, in the present invention, it is not necessary to add a special device or the like, and the punching device can be downsized.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing one process in an example of the present invention.

FIG. 2 is a schematic view showing another step in the example of the present invention.

FIG. 3 is a schematic view showing still another step in the example of the present invention.

FIG. 4 is a schematic view showing still another step in the example of the present invention.

FIG. 5 is a schematic view showing still another step in the example of the present invention.

FIG. 6 is a schematic view showing still another step in the example of the present invention.

FIG. 7 is a schematic view showing still another step in the example of the present invention.

[Explanation of symbols]

1 ... Punch, 2 ... Ceramic green sheet, 2b ... Punching waste, 3 ... Die, 4 ... Head

Claims (1)

[Claims] 1. A step of disposing a sheet material between a punch and a die of a punching device, a step of reciprocating the punch toward the die to punch the sheet material to form a hole, and further, the punch is provided with And a reciprocating movement toward a die to insert the punch into the hole.