JP4001984B2 - Punching device for thin sheet material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention generally relates to a punching device for thin sheet material.
More specifically, for example, a thin sheet material such as a metal foil or a composite sheet of a metal foil and another sheet body is punched in a predetermined pattern, such as a device for punching a conductor pattern of a flat cable or other flat wiring body. The present invention relates to a punching device.
[0002]
[Prior art]
This type of punching device is called a big type (Victoria type), and is configured as shown in FIG. 6, for example.
A plate-like (plywood, synthetic resin plate, metal plate, or composite plate thereof) holder 2 is partially embedded with a band-like big blade 1 for punching a thin sheet material a along a predetermined pattern shape. The holder 2 is attached to one mold (not shown).
A thin sheet material a such as a copper foil having a carrier sheet b made of a synthetic resin sheet on the back surface is punched into a predetermined pattern by the BIC blade 1, and a portion other than the pattern of the thin sheet material a is removed. The conductor pattern of the wiring body is formed.
The big-shaped big blade 1 and the holder 2 are commercially available products having a constant size. The width (height) of the band-shaped big blade 1 is 23.6 mm and the thickness of the holder 2 is 18 mm. The protrusion height from 2 is 5.6 mm. Further, the width of the punched portion a ′ of the conductor pattern, that is, the interval between the big blades 1 is generally around 2 mm.
[0003]
When the thin sheet material a is punched by the punch blade 1 of the punching device, the punched portion a ′ of the thin sheet material a sticks to the punch blade 1 or is plastically deformed into a state as shown in FIG. Therefore, various ideas have been made to prevent these problems.
For example, in Japanese Patent Laid-Open No. 5-50159, as shown in FIG. 6, an elastic body 4 made of a hollow elastic tube, sponge body, rubber or the like is filled between adjacent big blades 1 forming a predetermined pattern. It has been proposed.
Further, for example, Japanese Utility Model Laid-Open No. 5-17937 proposes that a liquid elastic body such as silicon rubber is poured and solidified between adjacent big blades.
[0004]
[Problems to be solved by the invention]
When an elastic body is provided between the big blades 1 as disclosed in JP-A-5-50159 and JP-A-5-17937, the punched portion a ′ is formed at the carrier sheet at the time of punching by the elasticity of the elastic body. Since it is pushed to the b side, the plastic deformation as described above of the punched portion a ′ can be prevented.
However, in these conventional big type, the protruding height of the big blade 1 from the holder 2 is large, the degree of turning and falling of the big blade 1 at the time of punching is increased, the cutting edge of the big blade 1 and the elastic body The cutting powder of the thin sheet material “a” remains in the gap formed between the elastic member 4 and the elasticity of the elastic body 4 hardly acts on the punched portion a ′ at the time of punching. It was not possible to sufficiently prevent the deformation and the occurrence of burrs and sagging on the punched end face.
When the punched portion a ′ is plastically deformed or burrs or sags remain on the punched end surfaces, the deformed portion, burrs or sag portions are likely to cause dielectric breakdown when the punched pattern is used as a conductor pattern. In order to prevent such inconvenience, measures such as increasing the thickness of the insulating layer of the thin sheet material a are required, but such measures cause high costs.
In addition, as disclosed in Japanese Utility Model Publication No. 5-17937, the liquid elastic body poured into the blades and solidified makes it difficult to select the elasticity of the elastic body. On the other hand, if the elasticity of the elastic body is large, the required punching pressure rises, which causes problems such as a design problem of the punching device and a breakage of the punching portion a ′.
[0005]
An object of the present invention is to provide a punching device for a thin sheet material capable of preventing plastic deformation of a punched portion and burrs and sagging of an end surface of the punched portion.
[0006]
[Means for Solving the Problems]
The thin sheet material punching apparatus according to the present invention is configured as follows in order to solve the above-described problems.
That is, the punching device for thin sheet material according to claim 1 is:
Along the pattern shape in which the thin sheet material a is punched out, the plate-like holder 2 is held in a state in which the band-like big blade 1 is partially embedded,
Between the big blades 1 along the pattern, the density according to the test method of JIS K 6767 is 0.1 to 0.6 g / cc, and the Shore hardness according to the test method of JIS K 6301 is 70 to 100. The elastic body 3 made of a resin foam is provided in an embedded shape so as to reach at least the cutting edges of the big blades 1 and come into contact with each other.
[0007]
The punching device for thin sheet material according to claim 2 is the punching device according to claim 1, wherein the thickness t is substantially the same as the protruding height h of the big blade 1 from the holder 2 or from the protruding height h. The resin foam 3a constituting the elastic body 3 that is slightly larger is punched out by the big blade 1 held on the holder 2 along the pattern shape, and does not follow the pattern shape of the resin foam 3a. By removing the portion, the elastic body 3 is embedded between the big blades 1.
[0008]
The punching device for thin sheet material according to claim 3 is the punching device according to claim 1 or 2, wherein the protrusion height h of the big blade 1 from the holder 2 is set to the big blade 1 along the pattern. Is set within twice the minimum interval w.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a punching device according to the present invention will be described with reference to FIGS.
1 is a partial sectional view of a punching device according to an embodiment of the present invention, FIG. 2 is a partial bottom view of the punching device of FIG. 1, and FIG. 3 is a procedure for embedding an elastic body between the big blades of the punching device of FIG. 4 is a partial cross-sectional view showing the first step, FIG. 4 is a partial cross-sectional view showing the next step of embedding an elastic body between the big blades of the apparatus of FIG. 1, and FIG. 5 is a thin sheet material by the punching apparatus of FIG. It is a fragmentary sectional view of the state which punched out.
[0010]
In FIG. 1 and FIG. 2, a band-shaped big blade 1 is held in a state where the band-shaped big blade 1 is partially embedded along a predetermined pattern shape in a wooden or other plate-like holder 2 of a big shape 2 a. The elastic body 3 made of a resin foam is inserted in an embedded manner so as to reach the blade edges of the big blades 1 from the base of the big blade 1 and come into contact with each other.
In this embodiment, the thickness of the elastic body 3 is set to be the same as or slightly larger than the protruding height h of the big blade 1 from the holder 2.
[0011]
The resin foam constituting the elastic body 3 is a foam of low foamed polypropylene or low foamed polyethylene, and has a density of 0.1 to 0.6 g / cc according to the test method of JIS K 6767, The Shore hardness according to the test method is in the range of 70-100.
[0012]
In this embodiment, the protruding height h of the big blade 1 from the holder 2 is the minimum interval w between the big blades 1 along the pattern (the interval between the big blades 1 is partially different in the punching pattern. Is less than twice the minimum interval). Although the minimum value of the protrusion height h varies depending on the thickness and material of the thin sheet material a described later (FIG. 5), which is a punching target, the thin sheet material a can be punched, and the elastic body 3 The elastic force may be set to a value sufficient to act in a direction in which the thin sheet material a jumps out from between the big blades 1 at the time of punching.
[0013]
In order to insert the elastic body 3 into the embedded shape so as to reach and contact the blade edges of the big blades 1 from the bases of the adjacent big blades 1, it is preferable to carry out in the following manner.
That is, as shown in FIG. 3, the elastic body 3 is formed on one surface of the SUS base 30 with the thickness t being substantially the same as or slightly larger than the protruding height h of the big blade 1. The resin foam 3a is supported, and the resin foam 3a is punched out by the big blade 1 held on the holder 2 along a predetermined pattern shape as shown in FIG. 4, and does not follow the pattern shape of the resin foam 3a. Remove unnecessary parts.
By inserting the elastic body 3 having the density and the shore hardness as described above in an embedded manner between the big blades 1 in the manner described above, the elastic body 3 is densely formed from the base portion between the adjacent big blades 1 to the cutting edge. , And there is no gap between the big blade 1 and the elastic body 3 over time.
[0014]
For example, as shown in FIG. 5, a thin sheet material a made of copper foil having a carrier sheet b on the back surface is supported on the surface of one mold 5, and the bicus blade 1 of the bicus mold 2 a in the punching device of the embodiment is moved to When the thin sheet material a is struck or the Bik blade 1 is struck to the thin sheet material a, the punched portion a ′ of the sheet material a is flat without being deformed plastically by the elastic force of the elastic body 3. When the mold 5 and the big die 2a are separated from each other, the elastic body 3 expands and recovers, so that each punched portion a 'is ejected from between the big blades 1 while maintaining a normal flat shape. .
Therefore, it is possible to smoothly punch the sheet material a without causing deformation of the punched portion a ′ or generation of burrs or sagging at the cut end of the punched portion a ′.
The elastic body 3 has the density and the shore hardness as described above, and is in close contact from the base of the adjacent big blade 1 to the cutting edge as described above, and the elastic body 3 and the big blade 1 over time. Since there is no gap in between, stable and normal punching is performed over a long period of time.
[0015]
In the above embodiment, the density and the Shore hardness of the elastic body 3 are set in the above-mentioned range because the density according to the test method of JIS K 6767 is less than 0.1 g / cc, and the Shore hardness according to the test method of JIS K 6301 is This is because when it is less than 70, when the thin sheet material a made of a metal foil or a composite sheet of a metal foil and an insulating sheet or the like is punched out, the deformation cannot be sufficiently prevented. On the other hand, when the density in the elastic body 3 exceeds 0.6 g / cc and the Shore hardness exceeds 100, the punching pressure increases, which is not preferable. This is because it becomes difficult to embed between each other as described above.
According to the experiment, when the thin sheet material a is a copper foil or a composite sheet of a copper foil and another sheet, and the resin foam constituting the elastic body 3 is a low foamed polypropylene or a low foamed polyethylene, the elasticity The optimum values of the density and the Shore hardness of the body 3 are 0.2 to 0.5 g / cc and 80 to 90, respectively.
[0016]
In the said embodiment, the protrusion height h of the said big blade 1 from the said holder 2 was made into less than twice the minimum space | interval w of the adjacent big blade 1 mutually. If the distance w exceeds twice, depending on the material and thickness of the sheet material a, even if the elastic body 3 is embedded between the big blades 1, the big blade 1 at the time of punching is used. The punching portion of the sheet material a is likely to be deformed due to the bending or the tilting of the sheet material, or the close contact between the elastic body 3 and the big blade 1 is lost over time, and there is a gap between them. This is because the possibility of occurrence increases.
[0017]
In the above embodiment, low-foaming polypropylene or polyethylene is used for the elastic body 3, but other resin foams can be used as long as the density and Shore hardness are within the above-mentioned ranges.
[0018]
【The invention's effect】
According to the apparatus for punching thin sheet material according to claim 1, the density according to the test method of JIS K 6767 is 0.1 to 0.6 g / cc between the big blades 1, and JIS K 6301 Since the elastic body 3 made of a resin foam having a Shore hardness of 70 to 100 according to the test method is provided in an embedded shape so as to reach and come into contact with the blade edges of the bi-blade 1, a punched portion at the time of punching the sheet material a And the occurrence of burrs and sagging associated with the deformation can be prevented.
Further, since the elastic body 3 has the density and the shore hardness as described above and is in close contact with each other until reaching the blade edge from the mutual base of the big blade 1, it is possible to prevent a gap from being generated with time. The sheet material can be punched stably and normally over a long period of time.
[0019]
According to the punching device for thin sheet material according to claim 2, the elastic body 3 made of the resin foam having the density and the shore hardness as described above is in close contact with each other until reaching the blade edge from the mutual base of the blade blade 1. Can be provided in an embedded form.
[0020]
According to the punching device for thin sheet material according to claim 3, since the protruding height h of the big blade 1 from the holder 2 is set within twice the minimum interval w between the big blades 1, the sheet material It is possible to more sufficiently prevent the punched portion from being deformed and the occurrence of burrs and sagging during punching of a.
Further, since it is possible to more sufficiently prevent the gap between the elastic body 3 and the big blade 1 over time, a stable and normal punching action for a longer period is ensured.
[Brief description of the drawings]
FIG. 1 is a partial sectional view of a punching device according to an embodiment of the invention.
2 is a partial bottom view of the punching device of FIG. 1. FIG.
FIG. 3 is a partial cross-sectional view showing an initial step of embedding an elastic body between the big blades of the punching device of FIG. 1;
4 is a partial cross-sectional view showing a next step of embedding an elastic body between the big blades of the apparatus of FIG. 1;
FIG. 5 is a partial cross-sectional view showing a state in which a thin sheet material is punched by the punching apparatus of FIG.
FIG. 6 is a partial cross-sectional view showing an example of a conventional punching device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Band-shaped big blade 2 Plate-shaped holder 2a Big type 3, 4 Elastic body 3a Resin foam 30 Base 5 One metal mold a Thin sheet material a 'Punching part b Carrier sheet

Claims (3)

Along the pattern shape in which the thin sheet material a is punched out, the plate-like holder 2 is held in a state in which the band-like big blade 1 is partially embedded,
Between the big blades 1 along the pattern, the density according to the test method of JIS K 6767 is 0.1 to 0.6 g / cc, and the Shore hardness according to the test method of JIS K 6301 is 70 to 100. The elastic body 3 made of a resin foam is provided in an embedded shape so as to reach and contact at least the blade edges of the BIK blade 1.
Punching device for thin sheet material. A resin foam 3a having a thickness t substantially the same as or slightly larger than the protruding height h of the big blade 1 from the holder 2 and constituting the elastic body 3 is formed along the pattern shape. The elastic body 3 is embedded between the big blades 1 by punching out with the big blade 1 held on the holder 2 and removing unnecessary portions of the resin foam 3a that do not follow the pattern shape. The punching device for thin sheet material according to claim 1, wherein the device is a punching device. The punching device for a thin sheet material according to claim 1, wherein the protruding height h of the big blade 1 from the holder 2 is within twice the minimum interval w between the big blades 1 along the pattern.

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