JP2006281323A - Burr preventive punch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent burrs to be made in a hole of a base board and defectiveness due to a change in bore diameter to the minimum, to bore a hole with high accuracy, and to achieve higher productivity in boring work using a punching machine in a multi-layer base board or a flexible base board. <P>SOLUTION: A first punch part 10 and a second punch part 20 are continuously formed in the axial direction in order from the leading end part, a first recessed part 1a is provided between the first punch part and the second punch part, a second recessed part 2a is provided in the rear part of the second punch part, the first punch part has a function of boring a workpiece, and the second punch part has a function of removing burr generated in the hole bored by the first punch part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a punch capable of preventing generation of burrs and forming a hole having an accurate hole diameter.
The punch for preventing the generation of burrs according to the present invention is designed to prevent burrs or the like generated in a workpiece of a material that is likely to generate burrs by punching with a punch such as a multilayer board of a printed wiring board or a flexible substrate. Is.

2. Description of the Related Art Conventionally, punching using a punching machine has been widely performed when a reference hole used in subsequent processing steps is drilled on a thin printed board or flexible substrate.
In punching in a punching machine, burrs as shown in the photograph of the hole in FIG. 5 may be generated in a hole formed by punching in a thin multilayer board or a flexible board in which different materials are laminated. Many. In the case of a thick plate, there is a problem that the hole diameters of the upper surface and the lower surface change.
Such a phenomenon is caused by the fact that the material of the thin multilayer substrate or flexible substrate is ductile and the edge of the cut surface of the material is not cut cleanly.

JP 2002-192254 A, JP 2004-10618 A,

In multi-layer boards and flexible boards, when burrs occur in holes punched, the position is automatically detected optically as a reference hole in the exposure process etc. A CCD camera or the like cannot be correctly detected due to the influence of burrs and hole diameters. Further, when used as a reference hole for a pin for fixing the substrate to the processing apparatus, there is a problem that the pin cannot be inserted into the reference hole well.
In the case of a thick plate, there is a problem that the hole diameters of the upper surface and the lower surface change.
If it is attempted to manually correct the burr generated in the drilling process or the change in the hole diameter between the upper surface and the lower surface, not only the man-hours but also the reference hole may be deformed.
In order to solve such a problem, it is required to realize a punch capable of making an accurate hole in a multilayer substrate or a flexible substrate.

In the present invention, the first punch portion and the second punch portion, each having the same shape, are successively formed in the axial direction from the tip portion, and the first punch portion and the second punch portion In the meantime, a first recess is provided, a second recess is provided in the rear part of the second punch part, and the first punch part has a function of drilling a workpiece, This punch portion solves the conventional problem by realizing a punch that prevents the occurrence of burrs having a function of removing burrs generated in the holes opened by the first punch portion.

By using the punch for preventing the occurrence of burrs according to the present invention, in the drilling operation using a punching machine in a multilayer substrate or a flexible substrate, defects due to burrs generated in the holes of the substrate and changes in the hole diameter are minimized. Therefore, a highly accurate hole can be drilled, and higher productivity can be realized.

Hereinafter, embodiments of a punch for preventing the occurrence of burrs according to the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating the configuration of an embodiment of a punch for preventing the occurrence of burrs according to the present invention.
In FIG. 1, reference numeral 1 denotes a punch for preventing the occurrence of burrs according to the present invention.
Reference numerals 10 and 20 denote punch portions of the punch 1 for preventing the occurrence of burrs, respectively, 10 is a first punch portion, and 20 is a second punch portion.
Reference numerals 1a and 2a denote concave portions provided in the punching punch 1, respectively.
The punch 1 includes a first punch portion 10 and a second punch that are continuously formed in the axial direction from the tip portion. A first concave portion 1 a is provided between the first punch portion 10 and the second punch portion 20, and a second concave portion 2 a is provided at the rear portion of the second punch portion 20.
The second recess 2a can be omitted depending on the thickness, configuration and material of the workpiece, and only the first recess 1a can be provided.
The first punch portion 10 and the second punch portion 20 are each formed in a circular cross section and have the same diameter.
The first punch unit 10 has a function of drilling a workpiece, and the second punch unit 20 removes burrs generated in the hole drilled by the first punch unit 10 to provide an accurate hole. It has a function to open up. The length, position, and number of the punch portion 10 and the punch portion 20 in the axial direction are determined according to the plate thickness, configuration, and material of the workpiece.

FIG. 2 is an explanatory view of the operation of the hole drilling process by the punch for preventing the occurrence of burrs according to the present invention.
In FIG. 2, reference numeral 1 denotes a punch for preventing the generation of burrs having the configuration shown in FIG. 1, and 2 denotes a die for working with the punching punch 1 to process a through hole.
Reference numeral 3 denotes a workpiece of a multilayer substrate or a flexible substrate on which punching is performed.
The punch 1 for preventing the generation of burrs is slidably held via a jig (not shown) of the press machine, and in the process of advancement of the punch 1, the front cylinder cooperates with the die 2 as will be described later. A through hole can be formed in the body 3.
The die 2 is disposed at the center of the hole formed in the workpiece 3 and has a function of forming a hole in the workpiece in cooperation with the punching punch during the drilling operation.
Therefore, as shown in FIG. 2, the die 2 is provided with a hole having a diameter slightly larger than the outer diameter of the first punch portion 10 at a position corresponding to the cutting edge of the punch 1 described above, and the first punch is placed in the hole. The cutting edge of the part 10 can be inserted.
The hole forming process using the punch having such a configuration will be described below.

2A and 2B are explanatory views for forming a hole in the workpiece 3, wherein FIG. 2A shows a drilled state by the first punch portion 10, and FIG. 2B shows the workpiece formed in FIG. The state is shown in which the second punch part 20 deletes burrs formed on the outer periphery of the hole when the first punch part 10 is drilled, using the hole as a guide.
First, as shown in FIG. 2 (a), when a work is made to make a hole in the work piece by the first punch portion 10 of the punch that prevents the generation of burrs, the work piece 3 is plastically deformed while the work is being deformed. 1 enters the slight gap 5 between the punch 10 and the die 2 to generate a burr b. The burr b extends between the first punch portion 10 and the second punch portion 20 after the first punch portion 10 has penetrated the workpiece 3, so As shown in FIG. 2A, burrs are generated on the inner peripheral surface of the opened hole.
Next, as shown in FIG. 2 (b), the hole formed by the first punch unit 10 is used as a guide to remove burrs by the second punch unit 20 punch having the same diameter as the hole. Is called.
The burr b extending between the recesses 1 a is sheared by the second punch portion 20 and the corner portion 6 of the die 2 when the second punch portion 20 passes through the die 2. By removing the burrs from the second punch portion 20, the inner surface of the hole is formed by removing burrs on the inner surface of the hole to some extent.

If the burr b remains without being sufficiently sheared by the second punch portion 20, the remaining burr b is not removed after the second punch portion 20 penetrates the workpiece 3. It extends again between the recesses 2a after the second punch portion 20.
In the case where there is a burr b remaining without being sheared by the second punch portion 20, the second punch portion 20 penetrates the workpiece 3 as shown in FIG. The burr b starts to extend between the second punch portion 20 and the second punch portion 20 in the same manner as described above when the punch 1 is pulled out from the die 2. When one punch 10 passes through the workpiece 3, it is sheared by the corners of each punch 20.10.
FIG. 4 shows the state of the hole opened by the punch of the present invention on the same workpiece as the photograph of the hole opened by the conventional punch shown in FIG. As is clear from FIG. 4, the burrs are well removed and clean holes are formed.
Since the punch of the present invention is provided with a plurality of punch portions 10.20 through a plurality of recesses at the tip, it is not necessary to increase the punch thrust even when the thickness of the object to be added increases, and a clean hole can be made. It became possible.

FIG. 3 is a diagram for explaining the configuration of another embodiment of the punch for preventing the occurrence of burrs according to the present invention.
In FIG. 3, the same parts as those in FIG.
The embodiment shown in FIG. 3 relates to a method for manufacturing the punch 1, and the first punch 10 and the second punch 20 are manufactured separately and combined to realize the punch 1. This is a characteristic.
FIG. 3A is a diagram illustrating a configuration of a punch unit used for the first punch unit 10 and the second punch unit 20.
In FIG. 3A, reference numeral 30 denotes a punch portion for preventing the occurrence of burrs according to the present invention. The punch portion 10 and the second punch portion of the punch 1 for preventing the occurrence of burrs according to the present invention shown in FIG. 20 is a part used.
Reference numeral 40 denotes a portion corresponding to a concave portion of the punch for preventing the occurrence of burrs according to the present invention. The first concave portion 1a and the second concave portion 2 of the punch 1 for preventing the occurrence of burrs according to the present invention shown in FIG. Used part.
Reference numeral 50 denotes a coupling portion of a punch unit having a male screw configuration. Reference numeral 60 denotes a female screw provided in a flat portion at the tip of the punch portion 30, and is configured to be fitted with the male screw of the coupling portion 50.
FIG. 3 (b) shows a punch for preventing the occurrence of burrs according to the present invention, which is constituted by connecting a plurality of punch unit units as shown in FIG. 3 (a).

The punch for preventing the occurrence of burrs in FIG. 3 (b) is also formed by successively forming the first punch portion 10 and the second punch portion punch portion 20 in the axial direction in order from the tip portion. A first concave portion 1 a is provided between the first punch portion 10 and the second punch portion punch portion 20, and a second concave portion 2 a is provided at the rear portion of the second punch portion 20. As in the embodiment of FIG. 1, the first punch unit 10 has a function of drilling a workpiece, and the second punch unit 20 is in a hole drilled by the first punch unit 10. It has a function to remove the generated burrs and make precise holes.
The embodiment shown in FIG. 3 is characterized in that the first punch unit 10 and the second punch unit 20 are separately manufactured separately and combined to realize the punch 1. When the first punch unit 10 is consumed or deformed due to use, the use period can be extended by exchanging the order of the units, and the punch cost can be reduced.
In the above description, an example of a two-stage punch having the first punch portion 10 and the second punch portion 20 has been described. However, the number of punch portions is not limited to two and is necessary. It is also possible to determine the number accordingly.
Moreover, although the cross section of the punch has been described as an example of a circular shape, the cross sectional shape of the punch is not limited to a circular shape, and can be configured in an arbitrary shape as necessary.
The present invention can be implemented in various other forms without departing from the spirit or main features thereof.
As described above in detail, by using the punch for preventing the generation of burrs according to the present invention, the burrs and hole diameters generated in the holes of the substrate in the punching operation using the punching machine in the multilayer substrate and the flexible substrate are used. As a result, it is possible to prevent defects due to the change of the height to the minimum, so that a highly accurate hole can be drilled and higher productivity can be realized.

  The present invention can be used in various industries using the electronic industry and printed circuit boards.

It is a figure explaining the structure of one Example of the punch which prevents generation | occurrence | production of the burr | flash of this invention. It is explanatory drawing of operation | movement of the hole drilling process by the punch which prevents generation | occurrence | production of the burr | flash of this invention. It is a figure explaining the structure of the other Example of the punch which prevents generation | occurrence | production of the burr | flash of this invention. The photograph of the hole opened by the punch which prevents generation | occurrence | production of the burr | flash of this invention is shown. The photograph of the hole opened by the conventional punch is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Punch 2 which prevents generation | occurrence | production of the burr | flash of this invention ... Die 3 ... Workpiece 10 ... 1st punch part 20 ... 2nd punch part 1a ... 2nd Concave portion 2a ... first concave portion 30 ... punch portion 40 for preventing the occurrence of burrs according to the present invention ... punch concave portion 50 for preventing the occurrence of burrs according to the present invention ... having a male screw configuration Punch unit unit coupling part 60 ... female screw provided on the flat part at the tip of the punch part 30

Claims (5)

A first punch portion and a second punch portion, each having the same shape, are continuously formed in the axial direction in order from the tip portion, and between the first punch portion and the second punch portion. A punch for preventing the generation of burrs, characterized by having a configuration in which a recess is provided. A first punch portion and a second punch portion, each having the same shape, are continuously formed in the axial direction in order from the tip portion, and between the first punch portion and the second punch portion. The punch has a configuration in which a first recess is provided and a second recess is provided at a rear portion of the second punch portion, and the punch prevents the occurrence of burrs. A first punch portion and a second punch portion having the same shape, each having a circular cross section, are sequentially formed in the axial direction from the tip portion, and the first punch portion and the second punch portion A punch for preventing generation of burrs, characterized in that a first concave portion is provided between two punch portions and a second concave portion is provided at a rear portion of the second punch portion. 4. The generation of burrs according to claim 1, wherein the first punch portion and the second punch portion are manufactured as a common independent unit, and are combined and combined to form a punch. Prevent punch. The independent unit according to claim 4 has a configuration having a coupling portion of a female screw provided at a flat portion at the tip of the punch and a male screw having a configuration for fitting with a female screw provided at the tip of the recess. Punch that prevents the occurrence of the characteristic burr.

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