JP2001009790A - Punch die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent breaking of a cutting edge and parting of a sheet by arranging a passage for introducing high pressure air in an upper die, injecting air into a green sheet from an air injection exclusive hole arranged in the vicinity of a cutting edge guide hole of a punch pin, and generating force for pressing the green sheet to a die. SOLUTION: When punching a hole in a green sheet 1 formed by joining ceramic powder such as alumina by a binder, an outer peripheral end surface of the green sheet 1 is fixed to an X-Y table to be positioned between a lower die and an upper die 5. High pressure air introduced to a passage 5a of the upper die in this state is injected from an air injection port 10c arranged in the vicinity of a punch pin cutting edge guide hole 10b. A work load is applied in the shaft direction of a punch pin 2 in this state, punching work is performed by lowering the punch pin 2, and since the green sheet 1 is pressed to the die by air injection from the air injection port 10c, breaking of a cutting edge and parting of the green sheet 1 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling process for a ceramic green sheet for forming a ceramic multilayer substrate, and more particularly to a die having a cutting edge guide mechanism for preventing a pin from breaking. The present invention relates to a punch die that is effective for preventing a failure in which a contact state between a green sheet and a die becomes unstable and a shape of a hole on the die side collapses and for reducing adhesion of scraps.

[0002]

2. Description of the Related Art As a punch die for punching a ceramic green sheet (hereinafter simply referred to as a green sheet), for example, a punch die in a punch device disclosed in Japanese Patent Application Laid-Open No. 4-111798 is known. Has been proposed.

[0003] The processing portion of this punch die has a structure as shown in FIG. 3. One or a plurality of punch pins are positioned slidably by guide bush positioning and guides in the axial direction thereof, and a stripper chamber is provided. The structure includes a stripper plate inserted and a die base having a die inserted at a hole position facing the punch pin.

[0004] As a processing method, after a green sheet to be drilled is arranged between a stripper plate and a die base, a punch pin is moved down by a driving force of an electromagnetic solenoid to apply a processing load, thereby forming a hole in the green sheet. In this case, a through hole is formed. Furthermore, a method is used in which a grease sheet is sequentially pitch-fed to perform drilling of a large number of through holes.

[0005]

In a conventional small-diameter punch, a mechanism for preventing the punch pin cutting blade from breaking is indispensable.
Generally, the holding of the green sheet at the time of drilling is performed in the gap between the upper and lower molds. With this method alone, variations in thickness and wrinkles of the green sheet cannot be absorbed, so that the green sheet floats up at the time of drilling, and there is a problem that shape defects such as cracks occur on the die side of the green sheet.

It is difficult to correct such a hole shape defect such as a crack, and there is a problem that the throughput of drilling is reduced. Conventionally, there has been a structure in which air is ejected from an upper punch pin guide portion, but there is no mold that can simultaneously apply a punch pin cutting edge guide mechanism and an air jet that can be applied to a small-diameter punching mold. Further, when a small-diameter hole is drilled, a phenomenon that a part of the scrap is adhered to the hole becomes remarkable, so that a mechanism for removing the adhered scrap is required.

[0007] Accordingly, an object of the present invention is a punch die which simultaneously realizes the following items. (1) Prevention of breakage of small diameter punch pin cutting blade. (2) Prevention of sheet lifting. (3) Removal of scum.

[0008]

SUMMARY OF THE INVENTION In order to solve the problems of the conventional method, the present invention applies a machining load in the axial direction of one or more punch pins to lower and raise the punch pins while guiding them with a punch pin guide. After placing a ceramic green sheet to be drilled between an upper die having a possible structure and a lower die having a die having a cutting edge portion diameter larger than the outer diameter of the cutting edge at the tip of the punch pin, a processing load is set. The punch die is lowered by the load of the punch, and the punching die that punches the cutting edge of the tip of the punch pin through the ceramic green sheet to be drilled and forms a through hole in the green sheet. Air is injected into the green sheet through a dedicated air injection hole near the cutting edge guide hole of the punch pin. The Rukoto a structure in which the force for pressing the green sheet die occurs.

[0009] Further, the air injection dedicated hole blade has a structure in which a plurality of holes are formed in accordance with the pitch at which holes are formed. As a result, it is possible to reduce the lifting of the green sheet from the die due to the looseness, unevenness of the thickness, elongation, etc. of the green sheet without sacrificing the function of preventing the pin from being broken, thereby preventing a defective hole shape due to the variation of the green sheet. it can.

Further, since the injected air has a function of holding and flattening the green sheet, precise adjustment of the gap between the upper and lower dies is not required.

Furthermore, the holes dedicated to air injection adapted to the pitch of the perforations blow off the residue remaining in the perforated holes from directly above, so that the cleanness of the holes can be realized.

[0012]

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

FIGS. 1 and 2 show an embodiment of the present invention. Reference numeral 1 denotes a green sheet which is a workpiece to be punched, and is placed between a lower mold 4 and an upper mold 5. The outer peripheral end face is fixed to an XY table (not shown), and a pitch from the control panel (not shown) can be sequentially fed in the feed direction 9 by the drilling pitch 8 in the feed direction 9. Reference numeral 2 denotes a punch pin which is a tool for making a hole in the green sheet 1,
The cutting edge 3a of the die 3 has the same diameter as the hole diameter to be drilled.

The punch pin 2 is guided by the inner diameters of a punch pin shaft guide 10a and a cutting edge guide 10b, which are press-fitted and fixed in the upper die 5, and is lowered by a processing load 6 to form a hole in the green sheet 1.

The lower die 4 mounts the green sheet 1 and fixes the die 3 for punching by fitting the outer diameter of the die 3 and the die fixing hole 4c.

The inner diameter of the cutting edge portion 3a of the die 3 is larger than the outer diameter of the tip cutting edge portion 2a of the punch pin 2, and when the punch pin 2 descends, the tip cutting edge portion 2a of the punch pin 2 becomes
When the green sheet 1 is inserted into the cutting edge 3a of the die 3, the green sheet 1 is subjected to a shearing process, the scrap 1b is dropped, and a through hole 1a is formed.

Here, the upper die 5 is provided with a flow path 5a, and communicates with the punch pin cutting edge guide 10b so that the high pressure air 7 can be guided to an air injection port provided near the punch pin cutting edge guide hole. Structure.

At the time of drilling, the cutting edge 3a provided on the die 3
Is a structure that generates a force for pressing the green sheet in the vicinity of.

The specific method and processing order of the punch die having the above-described configuration will be described.

First, a green sheet 1 to be perforated is formed by bonding ceramic powder such as alumina with a binder to form a sheet.
It is 0 × 200 mm. The outer peripheral end surface of the green sheet 1 is fixed to an XY table (not shown), and is placed between the lower mold 4 and the upper mold 5.

Next, a pressure of 5 kg / c is applied from the flow path 5a of the upper die 5.
Flow m2 high-pressure air 7 and guide hole 1 for punch pin cutting edge
Air is injected from an air injection port 10c provided near 0b.

After setting as described above, a working load of about 150 g is applied to the punch pin 2 in the axial direction, and the punch pin 2 is lowered to perform a boring process.

Next, the punch pin 2 is raised and the processing for one hole is completed. Further, the green sheet 2 is pitch-moved in the feed direction 9 by the hole pitch 8 by driving the XY table, and drilling is sequentially performed.

[0024]

As described above, according to the present invention, even in a green sheet punching die having a cutting edge guide mechanism for a punch pin, a hole in the green sheet can be obtained without sacrificing the function of preventing pin breakage. It is possible to prevent a defect in the hole shape that occurs at the time of drilling, and there is an effect of reducing cost in drilling.

Further, since the hole quality is stable, the formation of through holes and the printability of wiring can be improved, so that a highly reliable ceramic substrate can be provided.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a punch die to which the present invention is applied.

FIG. 2 is an external view showing a shape of a punch pin cutting edge guide portion of a punch die to which the present invention is applied.

FIG. 3 is a front sectional view showing a punch die in a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ceramic green sheet 1a ... Through hole 1b ... Debris 2 ... Punch pin 3 ... Die 3a ... Die cutting edge 4 ... Lower mold 5 ... Upper mold 5a ... High-pressure air flow path 6 ... Processing load 7 ... High-pressure air 8 ... Through hole pitch 10 ... Punch pin shaft guide 10a ... Punch pin cutting edge guide 10b ... Air injection port 10c ..Squirting air flow

Continued on the front page (72) Inventor ▲ Taka ▼ Masahiro Ki 1 Horiyamashita, Hadano-shi, Kanagawa Prefecture In-house Enterprise Server Division (72) Inventor Masahiro Umeda 1-Horiyamashita, Hadano-shi, Kanagawa Hichidate Within Information Technology (72) Inventor Koji Sato 4-6 Kanda Surugadai, Chiyoda-ku, Tokyo F-term in Hitachi, Ltd. (reference) 3C060 AA11 BA01 BG02 BG20

Claims (2)

[Claims] An upper die having a structure in which a punch pin can be lowered and raised while a punch pin guide guides a punch pin shaft and a cutting blade portion by applying a processing load in an axial direction of the punch pin, and a cutting edge of the punch pin. A lower die provided with a die having a cutting edge portion diameter larger than the outer diameter of the blade, and a punch pin guide portion provided on the upper die and guiding the cutting edge portion,
A green sheet having a flow path for guiding high-pressure air to the punch pin guide portion and a hole dedicated to air injection provided near the punch pin guide portion, and disposed between the upper die and the lower die In contrast, a punch die is formed by lowering a punch pin by applying the processing load and penetrating a cutting edge portion of a tip of the punch pin through the green sheet to form a through hole in the green sheet. 2. The air jet exclusive hole is provided in accordance with a pitch of a hole made in the green sheet.
The punch die described in the above.