JPH1158297A - Punch die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce production cost by installing a passage guiding a flow of high pressure air, and a nozzle with a hole diameter tapered off from the outer diametral surface to the inner diametral surface to accelerate an air-flow velocity, and setting up a spiral groove along the inner diametral surface of a die. SOLUTION: A passage 4a is installed in a drag 4, to communicate with a nozzle 3b of a die 3 to lead high pressure air 7 into a spiral groove 3c installed in an inner diametral surface of the die 3. A diameter of the nozzle 3b is tapered off toward the inflow direction of air, whereby a flow velocity of the high pressure air 7 is accelerated at the nozzle 3b. When this accelerated high pressure air flows along the spiral groove, a vortex flow 7a is produced there. Subsequently, any extract wastes 1b are forcibly separated from a cutting part 2a at the tip of a punch pin by dint of an impact of this vortex flow 7a, through which the extract wastes 1b are surely dropped and recovered over the whole circumference of an inner wall surface of the die 3. The extract wastes 1b are recovered by suction force of a dust collector immediately after being dropped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is effective when applied to the prevention of defective clogging, in which, in the drilling of an object to be drilled, scraps generated by the drilling remain in the through holes. It relates to a punch die.

[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.

[0005] The processing portion of this punch die has a structure as shown in FIG. 5, in which one or a plurality of punch pins are arranged in the axial direction of a guide bush so as to be slidable by a guide, and a stripper chamber is provided. 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 punching die, as shown in FIG. 5, no consideration is given to the processing of scrap removal by drilling. In particular, the structure of a die as a drilling tool is not considered. As a function, it was not structured to positively remove chips from the green sheet. Therefore, in the case of a sticky green sheet composed of ceramic powder and a binder, the through hole diameter to be drilled is as small as about φ0.1 and the number of holes is as large as several thousand to tens of thousands of holes. In addition, there is a problem that the debris 1c easily adheres to the inner surface of the die, and the sharpness of the die is reduced. Also, the scrap is attached to the tip of the punch pin, and as the punch pin rises, a part of the scrap is placed in the through hole.
However, there is a problem that the clogging is lifted and defective clogging occurs. For this reason, the removal and repair work after the drilling work is required, so that the cost is high. Also, when a circuit is formed by filling the through-holes with a conductive paste in a process after drilling, there is a concern that a defective electrical conduction may occur due to clogging of the scrap in the previous process (since the scrap is an insulator). In addition, there is a problem that the reliability of the entire substrate is reduced, such as occurrence of an open circuit failure.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a punch pin can be lowered and raised while being guided by a punch pin guide by applying a processing load in the axial direction of one or more punch pins. After placing a ceramic green sheet to be drilled between an upper die having a structure and a lower die having a die having a cutting edge diameter larger than the outer diameter of the cutting edge at the tip of the punch pin, a processing load is applied. In the punching die, the punch pin is lowered and the cutting edge at the tip of the punch pin is penetrated through the ceramic green sheet to be drilled to form a through hole in the green sheet. And the die has a predetermined angle from the outer diameter surface to the inner diameter surface, and the hole diameter becomes smaller from the outer diameter surface to the inner diameter surface. It has a structure provided with an air injection port capable of accelerating over flow rate. As a result, high-pressure air is introduced at high speed while accelerating into the inner surface of the die, and the high-speed air flows in a spiral groove provided along the inner surface of the die at high pressure and high speed to generate a spiral flow of air. With this spiral flow, the scraps of the green sheet adhered to the tip of the punch are forcibly separated, and the scraps can be efficiently removed from the inner diameter of the die.

In particular, because of the spiral flow of high-pressure, high-speed air, compared to a simple air injection method from one direction, etc.
It is characterized in that air can completely flow over the entire circumference of the inner wall surface of the die 3 in the circumferential direction, and can be completely removed without sticking scraps being adhered. Therefore, if even a part of the scrap is attached, it becomes a nucleus, and there is no danger that the scrap is sequentially deposited and grown (shown in FIG. 5). As a result, it is possible to completely eliminate defective clogging of the through holes formed in the green sheet by the drilling process,
The occurrence of defective product boards can be suppressed. Also, a groove for guiding high-pressure air from the entire outer diameter surface of the die is provided at the die mounting position in the lower die, and has a predetermined angle from the outer diameter surface to the inner diameter surface of the die, and the hole diameter is Two or more air injection ports were formed so as to be tapered from the outer diameter surface to the inner diameter surface so that the tip of the air injection hole was spiral along the inner diameter surface of the die. As a result, high-pressure air is accelerated from the entire surface of the die to the inner surface of the die while being accelerated, and the high-speed high-pressure air jet is spirally provided along the inner surface of the die. It is possible to generate a high-pressure and high-speed vortex flow.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a green sheet as a workpiece to be punched, which is placed between a lower mold 4 and an upper mold 5 and has an outer peripheral portion. The 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, and the tip cutting edge portion 2a has the same diameter as the hole diameter to be made. The punch pin 2 is guided by an inner diameter portion of a punch pin guide 10 press-fitted and fixed to the upper die 5, and is lowered by a processing load 6 to perform a perforating process on the grease sheet 1.

The lower die 4 mounts the green sheet 1 and fixes the punching die 3 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 punch pin 2
Is inserted into the cutting edge 3a of the die 3, thereby cutting the green sheet 1 to remove the scrap
b is dropped to form a through hole 1a. Here, the lower die 4 is provided with a flow path 4a.
And the high-pressure air 7 can be introduced into the spiral groove 3c provided on the inner surface of the die 3 by communicating with the injection port 3b. In addition, since the diameter of the injection port 3b is gradually reduced in the inflow direction of the air (the area of the flow path is reduced), the flow velocity of the high-pressure air 7 is accelerated by the injection port 3b. When the accelerated high-pressure air flows along the spiral groove 3c, a spiral flow 7a is generated. With the collision of the spiral flow 7a, the scrap 1 is removed from the punch pin tip cutting edge 2a.
b can be forcibly separated, and the scrap 1b can be reliably dropped and collected over the entire circumference of the inner wall surface of the die 3. In addition, when the scrap 1b falls, it is collected by a suction force of a dust collector (not shown).

A specific method and a processing order in the punch die configured as described above 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. The dimensions are 0.2 mm in thickness and 200 × 200 mm in size. 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 / cm2 high-pressure air 7 from the flow path 4a of the lower mold 4
And the velocity of the throttle is accelerated at the injection port 3b to flow into the spiral groove 3c provided on the inner surface of the die 3 to generate a spiral flow 7a. Here, the inlet diameter of the outlet 3b is 0.4 mm, the outlet diameter is 0.2 mm, the width of the spiral groove 3c is 0.2 mm, the depth is 0.2 mm, and the outlet angle 11 is 45 °. Also,
The inner diameter of the cutting edge 3a of the die 3 was 0.17 mm. After setting as described above, a processing 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 drilling. Next, the punch pin 2 is raised, and the processing for one hole is completed. Further, by driving the XY table, the green sheet 2 is moved in the feed direction 9 by the hole pitch 8.
, And perform drilling in order.

Next, another embodiment will be described with reference to FIGS.
This will be described with reference to FIG. In FIG. 2, an upper die 5, a punch pin 2, and a green sheet 1 are the same as those in FIG. The lower die 4 is provided with a flow path 4b through which high-pressure air 7 flows from the entire outer peripheral surface of the die 3 and communicates with a large number of injection ports including the injection ports 3d. This is a structure in which high-pressure, high-speed air is simultaneously ejected from all the ejection ports toward. Here, FIG. 3 is a detailed external view of the die 3. The diameter of the injection port inlet side 3d is 0.4 mm, and the diameter of the outlet side 3e is 0.2 m.
m, and the injection port angle 11 is 45 °. FIG. 4 shows the positions of holes on the outlet side of the injection ports, and 16 holes from 3e to 3t are spirally arranged as can be seen in FIG. as a result,
A high-speed and high-pressure spiral flow 7a is generated at the inner diameter of the die 3, and the scrap 1b is forcibly separated from the tip cutting edge 2a of the punch pin 1, so that the scrap 1b can be reliably collected. The drilling method using the punch die configured as described above is the same as in FIG.

[0012]

As described above, according to the present invention, in the green sheet punching die, it is possible to efficiently remove the debris from the green sheet at the time of drilling. This eliminates the need for work and has the effect of reducing costs. In addition, the risk of electrical continuity failure due to remaining scraps in the through holes can be avoided, 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 a front sectional view of a punch die to which the present invention is applied.

FIG. 3 is an external view showing a shape of a die of a punch die to which the present invention is applied.

FIG. 4 is an explanatory diagram showing a position of an air injection port of a die of a punch die to which the present invention is applied.

FIG. 5 is a front sectional view showing a punch die in a conventional method.

[Description of Signs] 1 Ceramic green sheet 1a Through hole 1b Debris 2 Punch pin 3 Die 3b Injection port a 3c Spiral groove 3d Injection port b 4 Lower die 5 Upper die 6 Processing load 7 High pressure air 7a Spiral flow 8 Through hole pitch 10 Punch pin guide 11 Injection port angle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiro Takagi 1st Horiyamashita, Hadano-shi, Kanagawa Prefecture, Hitachi, Ltd. General-purpose Computer Division (72) Inventor Hiroshi Hasegawa 1st Horiyamashita, Hadano-shi, Kanagawa, Hitachi, Ltd. (72) Inventor Masahiro Umeda 1st Horiyamashita, Hadano-shi, Kanagawa, Japan

Claims (2)

[Claims] 1. A punching pin is lowered by applying a processing load in the axial direction of one or a plurality of punch pins.
An object to be punched was arranged between an upper die having a structure capable of being raised 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. After that, the punch pin is lowered by the load of the processing load, and in a punch die for forming a hole in the workpiece, a flow path for guiding high-pressure air to the lower die is provided, and from the outer diameter surface of the die. An air injection port is provided so as to have a predetermined angle toward the inner diameter surface and the hole diameter becomes narrower from the outer diameter surface toward the inner diameter surface, and a spiral groove is provided along the inner diameter surface of the die. A punch mold. 2. A groove for guiding high-pressure air from the entire outer peripheral surface of the die is provided at a die mounting position in the lower die, and a predetermined angle from the outer peripheral surface to the inner peripheral surface of the die is provided. Two or more air injection ports that have a hole diameter that decreases from the outer diameter surface to the inner diameter surface are provided so that the hole position of the air injection nozzle tip is spiral along the inner diameter surface of the die The punch die according to claim 1, wherein: