JPH1034596A - Film punching method and film punching die used therefor - Google Patents

Abstract

(57) [Summary] [Purpose] To process films easily at low cost. A surface layer made of a contractible elastic body is formed on a non-punched portion except a convex punched portion, or a convex film pressing portion is provided outside the punched portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for punching a film suitable for processing a film and a die used for the method.

[0002]

2. Description of the Related Art Conventionally, as a method of cutting a plastic film into a target shape, there is a method of punching using a male mold. 7 and 8 are views for explaining a conventional punching method. In the conventional method, first, the male mold 1 having a convex punched portion having a target shape at the top is prepared. As shown in FIG. 7, in the punched portion of the male mold 1, a cutting blade 2 is formed in a vertical direction on a surface around the top surface. The female mold 3 is formed with holes 4 having substantially the same shape so that the male mold 1 can enter. In order to smooth the movement of the male mold 1 and the female mold 3, the hole of the female mold 3 is set slightly larger than the shape of the male mold 1, and between the female mold 3 and the male mold 1,
A clearance of several μm to several tens μm is provided.

However, due to the clearance, if the female mold 3 and the male mold 11 are simply combined, the film 7 may be drawn into the clearance 8 and may not be cut, or burrs 9 may occur. The problem of contamination occurs.

In order to cope with such a problem, in the conventional method, as shown in FIG. 8, for example, a core 5 having a hole 6 having the same shape as the female mold 3 is used, and the female mold 3 and the male mold 1 are used. During that time, the film had to be fixed. However, if the target shape of such a punching die is complicated, it is difficult to align the female die, the male die, and the core, and to make the clearance uniform, and burrs are likely to occur. In addition, chips, dust and the like enter the clearance portion, causing problems such as breakage of the mold, and damage due to slight displacement of the male, female, and core. Also,
The more complex the mold, the more expensive it becomes, and due to problems such as breakage, the number of uses per mold decreases,
The cost of punching increases.

[0005] In order to solve such a problem, there is a method in which, in the case of a complicated shape, instead of punching all at once, it is divided into simple shapes and punched out several times. Such a mold reduces the occurrence of breakage. In addition, there is a merit that even if it is damaged, only partial correction is required. However, there are problems such as a high mold making cost, a long time for making the mold, and an increase in size of the making device.
However, at present, this method is the only method for punching a complicated shape.

[0006] Even if this method is used, there is a limit to the accuracy of punching, and it is not possible to produce a very complicated shape.
FIG. 9 is a plan view illustrating an example of a mold having a complicated shape.
As shown in FIG. 9, for example, a comb-shaped tooth portion having a pitch of 1 m
In the case of a rectangular shape having a width of 0.5 mm and a male shape having a width of 0.5 mm and having one end connected, it is very difficult to perform accurate punching by the above-described punching method. With such a shape, it is possible to perform the processing with high precision by using a laser cutting or a cutting process by sandwiching it in a thick plate or the like instead of the punching. However, such a processing method requires a material such as a thick plate and the like, and requires a long time to make, and is expensive, so that it is not suitable for a method of mass-producing a film or the like.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to easily process a film at low cost even when a complicated shape is required.

[0008]

According to a first aspect of the present invention, there is provided a die body made of an inelastic body, having a convex punched portion and a non-punched portion in a region other than the punched portion; Formed on the non-punched portion, using a punching die including a surface layer made of a contractible elastic body, on the punched portion side of the die, a film to be punched, and a pressurizing material made of an elastic body in order. By arranging, and pressing the mold against the pressurized material through the punched film,
A film punching method including a step of punching a film to be punched is provided.

According to a second aspect of the present invention, there is provided a die body made of an inelastic body, having a convex punched portion and a non-punched portion in a region other than the punched portion, And a surface layer comprising a formed contractible elastic body.

According to a third aspect of the present invention, there is provided a punching die including a punched region having a convex punched portion and a convex film retainer provided outside the punched region. The height of the punched portion is at least twice the thickness of the film to be punched, the ratio of the height of the punched portion to the distance between the punched portions is 0.6 or less, and the mold is: A punching die having a Rockwell hardness of C scale 60 or more is provided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A film punching method according to a first aspect of the present invention comprises a die body made of an inelastic body having a convex punched portion and a non-punched portion in a region other than the punched portion. Using a punching die formed on the non-punched portion and including a surface layer made of a contractible elastic body,
A step of sequentially arranging a film to be punched and a pressing material made of an elastic body on the punching portion side of the mold, and pressing the mold against the pressing material via the film to be punched, The method includes a step of punching a punched film.

[0012] In the method of the present invention, preferably, an auxiliary film is further arranged between the film to be punched and the pressing material. This auxiliary film is used for assisting the punching of the film to be punched when the film to be punched is thin or soft and is similarly deformed by the deformation of the pressurizing material at the time of pressurization and cannot be punched out to the target shape. Used. As such a film, it is possible to use a resin film having a thickness and a strength that is not drawn and stretched even if it is deformed by a pressurizing material at the time of punching.

According to a second aspect of the present invention, there is provided a punching die used in the method according to the first aspect. A punching die according to a second aspect has a convex punching portion, and a punching portion in a region other than the punching portion, a die body made of an inelastic body, and formed on the non-punching portion. And a surface layer made of a contractible elastic body.

In the punching die used in the present invention, the contractible elastic body is preferably made of a foam. A rubber-like substance can also be used as the contractible elastic body. When a rubber-like substance is used, since the elastic body is distorted between the convex portion and the elastic body, it is preferable to provide an escape groove on the side surface of the convex portion, for example, to release the amount of the distortion. Still more preferably, the surface of the elastic body may be provided with a thin plate-like coating layer of a hard material such as metal or resin or ceramics. By providing such a coating layer, the punching accuracy can be further improved.

It is preferable that the surface layer made of the contractible elastic body is formed at a height equal to or less than the height of the punched portion, and more preferably substantially equal, and the mold surface is preferably substantially flat.

When a rubber-like substance is used as the elastic body to be embedded in the concave portion of the mold, a relief groove for allowing the amount of distortion of the elastic body to escape between the convex portion and the elastic body is used, or a rubber-like foam is used as the elastic body. This allows the cutting to be performed more smoothly. Further, by applying a hard material such as metal or resin or ceramic to the surface of the contractible elastic body filling the concave portion and providing a thin plate-like layer, the punching accuracy is further improved.

The pressing member is preferably made of an elastic material, and more preferably, is used, for example, by being adhered or sandwiched on a pressing die made of an inelastic material having a flat surface.

Further, in the punching die according to the third aspect of the present invention, the non-punched portion is not provided with a surface layer made of a contractible elastic body, but is provided outside the region where the punched portion is formed. It has almost the same structure as the mold according to the first aspect, except that a convex film pressing portion is formed on the mold.

A punching die according to a third aspect is a punching die including a punching region having a convex punching portion, and a convex film pressing portion provided outside the punching region. The height of the punched portion is at least twice the thickness of the film to be punched, the ratio of the height of the punched portion to the distance between the punched portions is 0.6 or less, and the die Is C scale 60
It is characterized by having the above Rockwell hardness.

[0020] The height of the convex punches is preferably 2 to 10 times the thickness of the film to be punched.
The height of the punched portion of the mold body is preferably 0.5 to 0.2 when the distance between the punched portions is 1.

The angle formed between the side surface and the top surface of the convex punched portion is preferably about 90 °, and more preferably,
It is an acute angle of 90 ° or less. The mold body more preferably has a Rockwell hardness of C scale 62-65.

In the punching dies according to the first and second aspects, the difference between the height of the convex punched portion and the height of the non-punched portion is twice the thickness of the film to be punched. This is the height of the punched part of the mold body,
It is preferable that the ratio to the distance between the punched portions is 0.6 or less, and the mold body has a Rockwell hardness of 60 or more on the C scale.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIGS. 1 to 3 are views for explaining a method for punching a film using an example of a punching die according to the first and second aspects of the present invention. As shown in FIG. 1, first, a mold main body 19 having a convex punching portion 11 having a target shape is prepared. Next, the punched portion 1 of this mold
The non-punched portion, which is an area other than 1, is buried by the elastic body 12 at almost the same height as the convex portion plane. This elastic body 12
Is softer than the elastic film for pressurization used at the time of pressurization, or there is a relief groove for deformation by pressurization between the convex and the elastic body, or closed cells or open cells that are open This is an elastic foam having: If the cells are open cells, the gas will escape easily and the gas will be smooth.

A resin film 16 to be punched out, an elastic film 14 having a flat surface, such as rubber, and a pressing die 13 having a flat surface are sequentially placed on the punched side of the die 20 thus obtained. Deploy. The elastic film 14 and the pressing mold 13 may be bonded or may be simply overlapped.

When the film is sandwiched therebetween and the elastic body from the mold convex portion to the concave portion is compressed through the film 11, the mold 20 acts as a male mold, and the elastic film 14 deformed by pressurizing is a female. Acts as a type. At this time, the film punched out is compressed in a fixed state sandwiched between the elastic film, the mold convex portion and the concave portion in which the elastic layer is embedded, and the strain is concentrated on the film hitting the edge of the convex portion,
Disconnection occurs.

When the film to be punched is thin and easily deformed, the elastic film 14 is deformed, and when the film to be punched is extruded from the convex portion to the concave portion, the elastic film 14 is pulled by the deformation of the elastic film 14. This causes elongation and distortion, and the cut shape differs from the desired shape of the upper surface of the mold convex portion. In such a case, by sandwiching an auxiliary film for assisting the holding of the punched film 16 between the punched film 16 and the elastic film 14, the film to be punched can be protected from deformation of the elastic body. This auxiliary film can also be used if further post-processing is required. The condition is that the auxiliary film can be deformed as the elastic film 14 is deformed.

The hardness of the mold is Rockwell hardness C.
A scale of 60 or more is preferable. If the size is less than 60, deformation of the mold projections and edges of the projections occurs at the time of pressurization, which tends to make the shape inaccurate and make continuous cutting impossible. For this reason,
The number of times of surface polishing and regeneration is increased.

The elastic layer 12 is preferably softer than the elastic film 14 for pressing. If it is equal or hard, it may not be compressed even if pressurized,
Sometimes cutting cannot be performed. Since the elastic layer 12 is sufficiently compressed when it is soft, the strain is concentrated on the film at the edge portion, and the elastic layer 12 is pulled and cut.

For example, when the elastic body is tightly packed in the concave part between the convex parts of the punched part, if the amount of pressure shrinkage is large, the compressed elastic body escapes in a direction not surrounded by the convex part. . At this time, after the punching, the elastic film does not return to the original state, and a part that cannot be punched out occurs.
The pressure condition width may be narrow. In such a case, a relief groove is provided between the elastic body and the convex portion to provide a margin for the condition width, and a relief portion for deformation due to pressure is provided, so that there is a margin for pressurization, and Displacement can be prevented. The smaller the width of the concave portion, the smaller the strain applied to the film, and the easier the cutting becomes.

Since it is sufficient if the film is fixed, a foamed elastic body which can be deformed and does not escape is preferably used. If the foam is closed cells, escape tends to occur. If all of the cells are open cells, the film is insufficiently suppressed. Therefore, a state in which closed cells and open cells are mixed is desirable. Closed cell ratio from 30% to 8
0% is desirable. Further, in order to securely fix the film, it is desirable to cover the film with metal, ceramic, or resin having a concave shape. In addition, when used for a long period of time, the edge of the convex portion of the mold becomes round, and when the cutting becomes insufficient, it is possible to regenerate by polishing the surface of the mold.

When there is no elastic body in the concave portion, the film corresponding to the concave portion is not fixed, and the strain stress and the elongation are not concentrated on the edge portion, but are performed in the entire concave portion. Therefore, cutting cannot be performed or only one side is cut. This phenomenon is likely to occur. In such a case, it is conceivable to reduce the depth of the concave portion in order to prevent this. In this case, if the depth of the concave portion is too shallow, the film stretches and cannot be cut, and if it is deep, the cutting becomes insufficient as described above. On the other hand, if the depth of the concave portion is too shallow, the allowable range of the depth becomes narrow, the number of times of re-polishing of the convex portion for regenerating the die is reduced, and the life of the die is shortened.

The thickness of the punched film is 100 μm.
m is desirable, and when it is thicker than this, the pressurizing pressure becomes very high, so that the convex portion of the mold may be deformed, which is difficult.
In the case where an elastic film such as rubber is punched, deformation occurs due to pressure and is difficult as it is. However, punching is possible with some measures such as suppressing elongation. The thickness of the elastic body is preferably at least twice the thickness of the film to be punched.

The standard of the pressurizing pressure is, for example, about 200 kg / cm ^{2 in the} area of the convex portion in the case of a polyethylene terephthalate film having a thickness of 20 μm, but is adjusted by the film thickness and strength.

When the films stacked as shown in FIG. 1 touch each other at the beginning of pressurization, a film 16 to be punched is sandwiched between the projection of the punched portion and the elastic film 14 serving as a female mold. Fixed. As shown in FIG. 2, the film 16 to be punched is pressed by the elastic film 1.
4 is extruded into a concave portion formed by deformation. At this time, since the concave portion of the punched portion is also filled with the elastic layer 12, the film 16 is fixed on both the concave portion and the convex portion of the punched portion, and the elastic layer 12 of the concave portion of the punched portion is pressed by the elastic film 14 and sinks. . In this way, the film 16 is cut at the edge of the punching portion 11 and the punching film 17 is obtained as shown in FIG.

By using the mold of the present invention, fine cutting can be performed as long as the pressing material such as an elastic film can be deformed. In addition, the cutting does not generate burrs, and the burrs do not enter into the clearance between the female die and the punched portion as in the conventional punching die.

As described above, by using the mold according to the first aspect of the present invention, the desired shape of the punched portion can be accurately transferred and cut. Note that the target shape can be formed not only in the convex part but also in the concave part by a post-process after the punching.

Next, a method for punching a film using a mold according to the third aspect of the present invention will be described. FIG.
FIG. 4 is a schematic view showing an example of a mold according to a third aspect of the present invention.

The punching die 20 is made of an inelastic body. As shown in FIG. 4, a convex punching portion 11 having a target shape and a film holding frame convex portion 22 are formed on one surface. , For example, as a male mold.

FIG. 5 is a diagram for explaining an example of a method for punching a film using the mold shown in FIG. FIG.
As shown in the figure, a film 16 to be punched, an auxiliary film 15, an elastic film 14 such as rubber, and a pressing die 13 having a flat surface are sequentially stacked on the punching portion 11 side of the mold 20.

FIG. 6 is a schematic view showing a state of punching a film. The punched film 16 is placed in a mold 20
The elastic film 14 is deformed by being sandwiched and pressed between the elastic film 14 and the elastic film 14. The film 16 is extruded into a concave portion formed by deforming the elastic film 14 by the punching portion 11 of the mold. At this time, the film 16 outside the edge of the projection of the punched portion 11 is pushed back to the mold side by the elastic film 14, so that the strain is concentrated on the film corresponding to the edge of the projection and cut.

The film holding frame 22 is
Is preferably provided outside the region, and preferably within 10 mm from the outermost convex body in the punched portion region. If the film holding frame 22 and the area of the punched portion 11 are too far apart, the effect of holding the film 16 tends to decrease. The film 16 is fixed by a film holding frame 22. When extruded by pressure, the film becomes taut and easy to cut.
Without the film holding frame 22, the film would bend and bend, resulting in non-uniform cutting. It is desirable that the width of the film holding frame 22 on the outer periphery of the area of the punched portion is smaller than the width of the adjacent mold convex portion. If the width is smaller than the width of the mold convex portion, the amount of extrusion of the elastic film 14 due to the pressurization at the time of cutting is small, so that the cutting of the film 16 near the frame 22 is delayed or cut off.

Further, in order to prevent the film from being cut in the vicinity of the film holding frame 22, it is desirable to chamfer the edge of the upper surface of the film holding frame 22.
The hardness of the mold must be Rockwell hardness of C scale 60 or more. If the hardness is less than this, the convex portion 11 of the punching die 20 and its edge are deformed by pressurization, and the shape becomes inaccurate. Or continuous cutting becomes impossible.

The thickness of the punched film is 100 μm
The following is desirable. If the thickness is larger than this, the pressurizing pressure becomes extremely high, so that the protrusion of the mold may be deformed, and accurate punching tends to be difficult. In the case of punching an elastic film such as rubber, deformation occurs due to pressure and it is difficult to do so. However, punching is possible by devising measures such as suppressing elongation. The thickness of the elastic body needs to be at least twice the thickness of the film to be punched, and if it is less than this, punching becomes impossible.

The standard of the pressing pressure is, for example, when punching a polyethylene terephthalate film having a thickness of 20 μm.
700 kg / cm with respect to the area of the upper surface of the projection of the punched portion
It is around ² . This value can be appropriately adjusted depending on the film thickness and strength.

As described above, when the mold according to the third aspect of the present invention is used, similarly to the invention according to the first aspect and the second aspect, the deformation of the pressing material such as the elastic film is performed. Fine cutting is possible as much as possible. In addition, the cutting does not generate burrs, and the burrs do not enter the female and male clearance portions as in the conventional punching dies, so that the die is not damaged.

[0046]

【Example】

Example 1 A mold steel material was quenched, the hardness was changed to Rockwell hardness C scale 62, and the width and height were 1.0 mm by electric discharge machining.
A male body having the same shape as the mold shown in FIG. 9 having 20 convex portions having a comb portion pitch of 1 mm was manufactured. A silicone rubber compound was put into the concave portion between the convex portions of the male mold body and cured. At this time, the protruding portion of the silicone rubber was cut such that the height of the surface of the silicone rubber compound was the same as the height of the upper surface of the convex portion. A 200 μm-thick silicone rubber was laminated on the quenched flat mold, and a 50 μm polyethylene terephthalate film was further laminated. On top of that, a male mold is placed, and 250 kg / cm
Pressure was applied at ² for 10 seconds. The obtained film had been punched into the shape of the upper surface of the male convex portion. In the same manner, punching was performed 10,000 times, but no deformation of the mold was observed, and the film was accurately punched into the shape of the upper surface of the convex portion of the mold.

Example 2 A mold steel material was quenched, the hardness was changed to Rockwell hardness C scale 62, and the width and height were 1.0 mm by electric discharge machining.
A male body having a shape similar to that of the mold shown in FIG. 9 having a comb portion pitch of 1 mm and 20 protrusions was manufactured. The silicone rubber compound was put between the 120 μm stainless steel foils on the side surfaces of the male concave portions and cured. The stainless steel foil was pulled out, and the protruding portion of the silicone rubber was cut so that the height of the convex portion became the same as that of the convex portion. A 200 μm thick silicone rubber layer was placed on the quenched flat die, and 5
A 0 μm polyethylene terephthalate film was overlaid.
A male mold was placed on top of it and pressed at 200 kg / cm ² for 5 seconds. The film was stamped into a male shape. Also,
Punching was performed 10,000 times in the same manner as in Example 1, but no deformation of the mold was observed, and the film was accurately punched into the shape of the upper surface of the convex portion of the mold.

Example 3 A mold steel material is quenched to a hardness of Rockwell hardness C scale 62, and the width and height are 1.0 mm by electric discharge machining.
A male body having a shape similar to that of the mold shown in FIG. 9 having a comb portion pitch of 1 mm and 20 protrusions was manufactured. The male mold of FIG. 3 was produced. A silicone rubber compound as a foam was placed in the recess between the convex portions, foamed, and cured.
The closed cell ratio of the foam was 50%. The protruding portion of the silicone rubber foam was cut so as to have the same height as the surface of the convex portion. 200μ thickness on quenched flat stamping die
m silicone rubber and a 50 μm polyethylene terephthalate film. A male mold was placed on top of it and pressed at 180 kg / cm ² for 3 seconds. The film could be punched into a male shape. The same operation was performed 10,000 times, but no deformation of the mold was observed, and the film could be accurately punched into the shape of the upper surface of the convex portion of the mold.

Example 4 A mold steel material was quenched to a hardness of Rockwell hardness C scale 62, and the width and height were 1.0 mm by electric discharge machining.
A male body having a shape similar to that of the mold shown in FIG. 9 having a comb portion pitch of 1 mm and 20 protrusions was manufactured. A silicone rubber compound to be a foam was placed on the side surface of the concave portion of the male main body, and a 50 μm-thick stainless steel foil formed into a concave shape was fitted into the concave portion and foamed and cured. The closed cell ratio of the foam was 50%. The protruding portion of the silicone rubber foam was cut so that the foam had the same height as the surface of the convex portion. A 200 μm-thick silicone rubber was laminated on the quenched flat mold, and a 50 μm polyethylene terephthalate film was further laminated. On top of that, a male mold is placed
Pressurization was performed at 180 kg / cm ² for 2 seconds. The resulting film had been punched into a male shape. When punching was performed 10,000 times in the same manner, no deformation of the mold was observed, and the film was accurately punched into the shape of the upper surface of the convex portion of the mold.

Example 5 A male body having a shape similar to that of the mold shown in FIG. 9 having 20 projections at a pitch of 1 mm was prepared by electrical discharge machining from a 1 mm thick nickel plate having a Rockwell hardness C scale 60. did. The perforated silicone rubber compound was applied to a 50 μm stainless steel foil, and the perforated plates were combined and foam-cured. The foam had a thickness of 1 mm and a closed cell ratio of 50%. The protruding portion and the protruding portion of the side face of the silicone rubber foam were cut so that the height of the protruding portion was the same as the height. 200μm thickness on quenched flat stamping die
A silicone rubber layer and a 50 μm polyethylene terephthalate film were further layered. On top of that, a male mold
The film was pressed at 80 kg / cm ² for 3 seconds to punch out a film. The perforated plate and the unnecessary film on the perforated outer periphery were removed, and a silicone rubber foam was taken out. The punched comb-shaped film adhered to the surface of the silicone foam convex portion, and the comb-shaped film was easy to handle after punching. The silicone elastic body was returned to the perforated plate and punched 5,000 times in the same manner, but the mold was not deformed.
The film was able to be accurately punched in the shape of the upper surface of the convex part of the mold.

Example 6 A mold steel material was quenched, the hardness was changed to Rockwell hardness C scale 62, and the width and height were 0.5 mm by electric discharge machining.
The pitch of the comb portions is 1 mm, and 20 convex portions are formed at a distance of 3 mm from the outside so as to surround the convex portions by 1 m.
An m-width film holding frame was provided, and a male mold having the same shape as the mold shown in FIG. 4 was produced. Similarly, a 200 μm-thick silicone rubber was superimposed on a quenched flat pressing die, and a 50 μm polyethylene terephthalate film was further superimposed. A male mold is placed on top of it, and 750 kg / cm ² at 10
Pressurized for seconds. The film could be punched into a male shape. In the same manner, punching was performed 10,000 times, but no deformation of the mold was observed, and the film could be accurately punched into the shape of the mold.

In the same manner as described above, a thickness of 20
A 0 μm silicone rubber layer and a 100 μm thick polypropylene film were further layered. A polyethylene terephthalate film having a thickness of 6 μm was laminated thereon. A male mold was placed on top of it, and pressurized at 880 kg / cm ² for 10 seconds. The polypropylene film was deformed into a male shape, in which a polyethylene terephthalate film was punched into a mold shape. The same operation was performed 10,000 times, but no deformation of the mold was observed, and the film could be accurately punched according to the shape of the upper surface of the mold.

Example 7 A mold steel material was quenched, the hardness was changed to a Rockwell hardness C scale 62, and thirty convex portions having a width of 0.5 mm and a pitch of 0.5 mm were formed by electric discharge machining. Its height is 0.025, 0.05, 0.1, 0.15, 0.20,
0.30, 0.35, 0.40, 0.45, 0.50,
Eleven kinds of molds were prepared by changing to 0.60 mm.
Each mold is 3 m from the outside of the convex part to be the punched part.
At 1 m, a 1 mm-wide film holding frame was provided so as to surround the projection, and a male mold having a shape similar to the mold shown in FIG. 4 was produced. Similarly, a 200 μm-thick silicone rubber was superimposed on a quenched flat pressing die, and a 100 μm polyethylene terephthalate film was further superimposed. A male mold was placed on top of it and pressed at 600 kg / cm ² for 10 seconds to perform punching. Table 1 shows the results.

[0054]

[Table 1]

As is apparent from Table 1, when the ratio of the height of the projections to the width between the projections exceeds 0.6, the cutting is not sufficiently performed, and the height of the projections is 2 times the film thickness. If it is less than twice, poor cutting will occur.

Example 8 A mold steel material was quenched, and the hardness was changed to Rockwell hardness C scales 45, 50, 55, 60, and 65.
Except that the height of the convex portion was set to 0.25 mm, five types of molds were prepared in the same manner as in Example 7, and punching was performed in the same manner, and the number of times of complete cutting and the state of cutting were examined. Table 2 shows the results.

Table 2 Hardness C 45 50 55 60 65 Number of cuts 2 2 7 100 or more 100 or more As is clear from Table 2, as a result of complete cutting inspection on both sides, cutting is continued if the hardness is not 60 or more. It turns out that you cannot do it.

[0058]

According to the present invention, even if a complicated shape is required, the film can be easily processed at low cost.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a method of punching a film using a mold according to first and second aspects of the present invention.

FIG. 2 is a view for explaining a method of punching a film using a mold according to the first and second aspects of the present invention.

FIG. 3 is a view for explaining a method of punching a film using a mold according to the first and second aspects of the present invention.

FIG. 4 is a schematic view showing an example of a mold according to a third aspect of the present invention.

FIG. 5 is a view for explaining an example of a method for punching a film using the mold shown in FIG. 4;

FIG. 6 is a schematic view showing a state of punching a film.

FIG. 7 is a view for explaining a conventional punching method.

FIG. 8 is a view for explaining a conventional punching method.

FIG. 9 is a plan view illustrating an example of a mold having a complicated shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Male type 2 ... Cutting blade 3 ... Female type 4 ... Female type hole 5 ... Core 6 ... Core hole 7 ... Film 8 ... Clearance 9 ... Burr 10 ... Punched film 11 ... Punched part 12 ... Surface layer 13 ... Pressing die 14 ... Elastic body 15 ... Auxiliary film 16 ... Film 17 ... Punched film 20 ... Mold 22 ... Film holding part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akira Matsuura 1 Koga Toshiba-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Inside the Toshiba R & D Center

Claims (5)

[Claims] 1. A mold body comprising a convex punched portion and a non-punched portion in a region other than the punched portion, comprising a non-elastic body, and an elastic body formed on the non-punched portion and capable of contracting. Using a die for punching including a surface layer, a step of sequentially arranging a film to be punched, and a pressurized material made of an elastic body on the punched portion side of the die, and passing the die through the film to be punched. Characterized by comprising a step of punching a film to be punched by pressing the film to be pressed with a pressure material. 2. The film punching method according to claim 1, wherein an auxiliary film is further disposed between the film to be punched and the pressing member. 3. A mold body comprising a convex punched portion, a punched portion in a region other than the punched portion, and made of an inelastic body, and a contractible elastic body formed on the non-punched portion. A die for punching a film, comprising: 4. The die according to claim 3, wherein the contractible elastic body is made of a foam. 5. In a punching die including a punched portion region having a convex punched portion, and a convex film pressing portion provided outside the punched portion region, the height of the punched portion is controlled by The thickness of the punched film is twice or more, the ratio of the height of the punched portion to the distance between the punched portions is 0.6 or less, and the mold is:
A die for punching a film, having a Rockwell hardness of 60 or more on a C scale.