JPH0692079B2 - Punchless punching method for work materials - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for punching a work material made of a high-strength brittle material such as an amorphous alloy foil or a ceramic foil.

2. Description of the Related Art A punching method using a punch press machine is one of the processing methods for a thin material having a high tensile strength such as an amorphous alloy foil or a thin material having a low toughness such as a ceramic foil. According to this method, it is easy to form, and it is easy to form curves and complicated shapes.However, in the case of amorphous alloy foil as an example, burrs are likely to occur at the cut end and the plate thickness is thin. It requires skill in setting the clearance of the die set, and wear of the die and the punch is extremely frequent, so that the life of the die set is extremely short, which is a drawback.

In order to solve the upper-level problem, a punchless method in which a punch is not used is also proposed. One of them is to set a work material on a conventional die, place a thin body made of plastic material on top of this, and press the pressure plate at high speed to press the plastic material, There is a method of punching by flowing into a die (Japanese Patent Laid-Open No. 62-2283).
No. 99).

Problems to be Solved by the Invention In the case of punching an amorphous alloy foil by the punchless method as described above, for example, the size is small and the shape is simple, for example, a disk having a diameter of 5 mm, a width of 3 mm, and a length of about 10 mm. Rectangle stamping is possible, but it is E type or one side 10
It is not appropriate to punch out an asymmetrical shape such as a L-shaped mm or a symmetrical one having a large size. This is because, if a material having such a shape is punched from an amorphous alloy foil, an uncut portion may remain, or brittle fracture may make it impossible to obtain a desired shape.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a punchless punching method capable of punching with a clean cut and good quality even if the size is asymmetrical or symmetrical and large in size.

Means for Solving the Problems Therefore, according to the present invention, an adhesive layer is interposed between a work material such as an amorphous alloy foil or a ceramic foil and a thin-walled body, or a tape with an adhesive is adhered to the work material. It is a punching process.

That is, the present invention uses a press machine composed of a die and a pressure plate which is driven at a high speed facing the die, and a work piece made of a high-strength brittle material such as an amorphous alloy foil or a ceramic foil is formed on the die. After setting the material, place a thin body made of plastic material on it, press the thin plate on top of it to press the thin body, and in the method of punching the work material, the work material and the thin body Or an adhesive tape is adhered to either one or both of the material to be processed and the die to intervene.

An example of the processing apparatus used in the method of the present invention is shown in FIG. This device comprises a die 1 and a pressurizing device 2 above it. The pressurizing device 2 is laminated with a pressurizing coil 3, a pressure receiving plate 4 arranged below the pressurizing coil 3, and below the pressure receiving plate. An insulating plate 5 and a pressure plate 6 are provided.

The wire of the pressurizing coil 3 is wound on a horizontal plane, forms a circuit with the condenser 8, and is opened / closed by a switch 9. The pressure receiving plate 4 is a plate-shaped member made of a conductive metal such as copper, and the insulating plate 5 is a plate-shaped member made of bakelite, for example. The pressure plate 6 is a thick plate-shaped body made of iron.

At the time of punching, a work material 11 such as an amorphous alloy foil is placed on the die 1, and a tape 12 with an adhesive is stuck on the work material 11. Then, the plastic material 13 is further placed on this. The plastic material 13 is made of an elasto-plastic material such as a plastic material such as nylon, polycarbonate, or polyethylene, and has a thickness of several tens of times the thickness of the workpiece 11.

Next, when electric energy is stored in the condenser 8, the switch 9 is closed and a large shock current is passed through the pressure coil 3, a repulsive force generated between the pressure receiving plate 4 and the pressure coil 3 in which an induced current is induced is generated. The pressure receiving plate 4 is pushed down, and the pressure plate 6 descends at high speed. Then, the die 1 is pressed by the pressure plate 6 and the plastic material 13 presses the workpiece 11 via the tape 12 with the adhesive.
Flow into. At this time, a shearing force is applied to the work material 11 and punching is performed.

Although the plastic material 13 is compressed by the lowering of the pressure plate 6 due to the action impact force, when the plastic material directly contacts the work material 11 such as the amorphous alloy foil when flowing into the die, the plastic material 13
Fine slip occurs between the work piece 11 and the work material 11 and the work material 11
It is considered that the shearing force to the surface becomes uneven, and therefore punching of an object with a small size and a symmetrical shape has little effect, but it is possible to punch with an asymmetrical shape or a large size. It is considered that a good punched product cannot be obtained due to partial uncutting or brittle fracture.

However, the tape with adhesive 12 and the plastic material 13
When it is inserted between 11, when the plastic material 13 flows into the die 1, the plastic material 13 and the work material 11 are not in direct contact with each other so that slippage is eliminated and the shear force is evenly applied to the work material 11. As a result, punching is possible even with asymmetrical shapes and large dimensions.

After all, it is necessary to reduce slippage between the plastic material 13 and the work material 11, and for that purpose, the plastic material 13 is adhered onto the work material 11 with an adhesive material instead of the adhesive tape 12. You may keep it.

Also for the adhesive-attached tape 12, the base material that is in direct contact with the plastic material is preferably paper or non-woven fabric, especially paper, and particularly preferably an adhesive-attached paper tape such as a correction cover-up tape. Since the adhesive tape 12 must be removed after punching the material to be processed, it is preferable that the adhesive tape 12 does not have strong adhesion to the material to be processed.

Example 1 and Comparative Example 1 13 mm wide and 30 mm long using the punching machine shown in FIG.
The letter E was punched.

The die had a groove with a width of 0.5 mm on the entire circumference of the E-shaped outer circumference, and an alloy tool steel (SKD11) machined to the outer edge of this groove to 0.5 mmC was used.

As the amorphous alloy foil, 2605S-2, which is widely used for transformer cores, is used, and the dimensions are 30 mm in width and 45 mm in length.

Nylon 66 is used as the plastic material, the plate thickness is 1 mm, and the dimensions are 2 horizontal.
3mm and 40mm in length.

As the adhesive-attached tape to be adhered onto the amorphous alloy foil, a cover-up tape for correction whose base material is paper was used.

FIG. 2 shows a die-cut product with the cover-up tape attached as described above.

FIG. 3 shows a comparative example in which the plastic material was directly placed on the amorphous alloy foil and punched without using the adhesive tape.

As shown in the figure, the amorphous alloy foil, which had been punched out as it was, had many uncut parts (dotted lines indicate the required cutting points and solid lines indicate the actual cutting points). The product punched out using the tape with the agent had a perfect E shape and had a good cut end.

Example 2, Comparative Example 2 Using the punching machine shown in FIG.
The letter-shaped punching process was performed.

As the die, an alloy tool net (SKDII) having L-shaped grooves was used.

The same amorphous alloy foil as in Example 1 was used,
The dimensions were 20 mm wide and 20 mm long.

The plastic material used was the same as in Example 1 except that the size was 20 mmφ, and the adhesive tape was the same as in Example 1.

The punched product as described above is shown in FIG.

FIG. 5 shows a comparative example which was punched out without using the adhesive tape.

As shown in the figure, the amorphous alloy foil that had been punched out as it was had many uncut portions, and cracks were generated in some areas, which was defective, but it was punched using adhesive tape. The removed one had a perfect L-shape and had a good cut end.

Example 3 and Comparative Example 3 13 mmφ circular punching was performed using the punching apparatus shown in FIG.

The die has a groove with a width of 0.5 mm on the entire circumference of the O shape,
An alloy tool net (SKDII) was used in which the outer edge of the groove was machined to 0.5 mmC.

The same amorphous alloy foil and plastic material as in Example 2 were used.

FIG. 6 shows the punched product as described above.

FIG. 7 shows a comparative example which was punched out without using the adhesive tape.

The amorphous alloy foil punched as it was was defective because many uncut parts remained, but the one punched using the adhesive tape had a perfect circular shape and the cut end was also It was good.

EFFECTS OF THE INVENTION According to the punchless punching method in which the adhesive tape according to the present invention is applied to a work material, or an adhesive layer is interposed between the work material and the plastic material, a punched asymmetric shape Even with a symmetrical shape, it is possible to punch a large size.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a punching machine, and FIG. 2 is a first embodiment.
FIG. 3 is a punched product according to Comparative Example 1, FIG. 4 is a punched product according to Example 2, FIG. 5 is a punched product according to Comparative Example 2, FIG. 6 is a punched product according to Example 3, and FIG. The figure shows a punched product according to Comparative Example 3. 1 ... Die, 2 ... Processing device, 3 ... Pressure coil, 4
...... Pressure receiving plate, 11 ...... Amorphous alloy foil, 12 …… Adhesive tape, 13 …… Plastic material

 ─────────────────────────────────────────────────── ─── Continuation of the front page Examiner Koji Okubo

Claims (3)

[Claims] 1. A press machine comprising a die and a pressure plate which is driven at a high speed in opposition to the die is used to set a thin plate-shaped workpiece made of a high-strength brittle material on the die, and thereafter, In a method of placing a thin body made of a plastic material on top of it, driving a pressure plate at a high speed from above to press the thin body, and punching the work material, an adhesive layer between the work material and the thin body. A punchless punching method for a work piece, characterized in that the work piece is intervened or the adhesive tape is adhered to either one or both of the work piece and the die. 2. The punchless punching method for a work piece according to claim 1, wherein the adhesive tape has a base material of paper or non-woven fabric. 3. The punchless punching method for a work material according to claim 1, wherein the adhesive tape is a correction cover-up tape.