JPS60206522A - Plastic working method of twisted plate - Google Patents

Abstract

PURPOSE:To obtain a twisted plate having arbitrary angle of torsion from a flat plte by putting a superhard flat plate in working holes of a pair of dies having slitlike working holes, and giving twisting work to the heated flat plate by relative rotational movement of the dies. CONSTITUTION:A superhard flat plate 9 an end of which is fixed by an indenting punch 10 is supported by slitlike working holes 11a, 12a of dies 11, 12 made of ceramic through a heating part 13. A die 11 nearer to the punch 10 is fixed and a farther die 12 is made rotatable, and the die 12 is driven by a power source. The flat plate 9 is pushed in the direction of the arrow (a), and at the same time, rotated in the direction of the arrow (b) by the die 12. In the meantime, the heated flat plate 9 is twisted by the force caused by rotation of the die 12. The twisted part is extruded successively to outside from the hole 12a of the die 12 by pushing force of the punch 10 and taken out as a plate 9' twisted to spiral form.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for obtaining a twisted cemented carbide plate having an arbitrary helix angle and particularly useful for use in implanted blades or cutters with attached blades from a flat plate by plastic working. It is.

FIG. 1 shows a sectional view of a device for explaining the prior art. 1 is a cylindrical outer mold made of graphite, which has a stepped hole with a large diameter at the top and a small diameter in the middle.

2 is a graphite inner mold with a cylindrical shape and a large-diameter head shaped like a brim at the top, and is a twisted type with a straight upper part and an appropriate interval that is twisted from the middle, and is made from two parts 2a and 2b. It is what it is. The inner mold 2 is fitted into the hole of the outer mold 1 and acts as a mold. A metal flat plate 4, which is a workpiece, is inserted into the straight part 3 of the inner mold 2.

On the outside of the outer mold 1, there is a coil 5 for high-frequency induction heating that electrically heats the inner and outer molds 1.2 and the cutting edge workpiece. The heated flat plate 4 of the workpiece is pushed in by the pushing punch 6. The pressed flat plate 4 of the workpiece is twisted along the twist of the mold, becomes a twisted plate 8, and is sent downward. Twisting is performed in this way, but in this conventional technique, the mold is heated, so the area around the mold is isolated from the outside air by the partition wall 7, and N2 is kept inside.
The equipment was bulky because it was necessary to introduce a reducing gas such as gas to prevent oxidation.

In addition, an axial force unrelated to twisting is applied to the mold,
The problem is that the mold may suffer from fatigue failure.

It is an object of the present invention to improve the drawbacks of the above-mentioned prior art and to provide a rough processing method capable of obtaining a twisted plate having a freer twist angle than a flat plate.

In order to achieve the above object, the present invention allows a flat plate of metal, particularly carbide, to be processed to be passed through a pair of machined holes having slit-shaped holes through a pushing device, and is installed between them. Heating is performed using a heated heating unit (tl! conduction heating heater, etc.). The heated workpiece is twisted 9 by the relative rotational movement of the dies, and then the workpiece is pushed in to continuously twist the workpiece. At this time, one of the pair of molds is fixed and the other rotates to perform the upward twisting process.

The mold is made of a material that does not easily oxidize, such as semilac,
The pushing speed is controlled according to the amount of rotation of the mold.

The present invention will be described in detail. FIG. 6 is a perspective view of a processing device for explaining one embodiment of the present invention.

One end of the flat plate 9 is fixed with a push punch 1o. This flat plate 9 is supported via a heating section 13 in slit-shaped holes 11a and 12a provided in a mold 11.12. The molds 11 and 12 are made of semi-hook, and the mold 11 closest to the push-in punch 10 is fixed, and the push-in punch 10
The mold 12 further away from the mold 12 is made rotatable. The mold 12 is driven by a power source (not shown) such as a motor and gears.

The direction of rotation of the mold 12 is the direction of the arrow (b), in which the flat plate 9 is pushed forward by the push punch 10, with the (b) arrow direction as the axis. The flat plate 9 heated by the heating unit 13 is twisted by the force generated by the rotation of the mold 12.

The twisted portion is sequentially pushed out from the machined hole 12a of the mold 12 by the pushing force of the push punch 1o. The flat plate 9 extruded from the mold 12 in this manner comes out as a spirally twisted plate 9'.

In this case, the distance between the two dies must be as close as possible to improve the accuracy of the torsion angle of the workpiece.

In addition, the heating unit 13 heats a minute section of the flat plate 9, so that
For example, the flat plate 9 is directly heated using a high frequency induction heating method.

Note that the pushing speed of the pushing punch 10 is determined by the deformation speed. A case in which a flat plate 9 having a twist angle of β is processed will be specifically explained using FIG. 7.

Let Δχ be the minute section of the deformed part, and Δy be the displacement caused by the force in the rotational direction of the die 12 on the side surface of the flat plate 9 (the outer circumferential surface when it becomes the twisted plate 9'), then the punch will be pushed in. The speed ■x is obtained as follows.

Therefore, the pushing speed vX of the pushing punch 10 is the die 12.
It is necessary to control by displacement in the rotational direction.

In addition, to give an example of a high frequency induction device used as a power source for the heating section 13, when a 15 KW, 30 kHz high frequency coil is used, the heating temperature is 1150 °C and the pushing speed is 5 ml 1 / sec. Furthermore, if the flat plate 9 of the workpiece is likely to be oxidized by heating, it is also necessary to seal the vicinity of the heating section 13 with a reducing atmosphere.

As described in detail above, when the method according to the present invention is used, a large-scale device is not required because the heating section is a minute section. In addition, since no twist mold is used, the twist angle can be adjusted freely, and it is also possible to process twisted plates in which the twist angle changes midway. Furthermore, by shifting the position of the processed hole 12a from the central position shown in FIG. 8 to the horizontal position shown in FIG. 9, a spirally twisted plate can be obtained.

Brief description of the drawings: Figure 1 is a sectional view of IIt position for implementing the prior art;
Figure 2 is a perspective view of the outer mold, Figure 3 is a perspective view of the inner mold, Figure 4 is a perspective view of a flat plate, Figure 5 is a perspective view of a twisted plate, and Figure 6 is a perspective view of the present invention. FIG. 7 is an explanatory diagram showing the displacement of the flat plate in a minute section of the heating zone, and FIGS. 8 and 9 are front views showing examples of the positions of the machined holes. be.

9: Flat plate, 9': Twisted plate, 10: Push-in punch, 11.12: Mold, 12a: Machining hole, 13: Heating department representative, patent attorney Takashi Honma, Figure 1, Figure 2, Figure 2, Volume 3 Figure 4 Continuation of Figure 5, page 1

Claims (1)

[Claims] The workpiece is passed through holes provided in at least two molds via a pushing device, heated by a heating section installed between them, and the heated workpiece is given a relative relationship between the molds. 1. A method of plastic working of a twisted plate, characterized in that twisting is performed by rotational motion, and then the workpiece is continuously pushed in to perform twisting.