JPS6099431A - Method and apparatus for correcting strain of metallic disk - Google Patents

Abstract

PURPOSE:To correct disks with high accuracy and with high efficiency in a method that piles up metallic disks blanked to annular shape and presses under heating, by fitting the center holes of the disks to a rodlike body. CONSTITUTION:A coned disc spring 16 having a central hole is attached to a fixed seat 15 provided in a body in the lower end of the supporting shaft 14 of the rodlike body and an annular heat insulating block 17 is inserted through the shaft 14. Then, spacers 13 and layers of specified laminated thickness of metallic disks having a center hole 12 are inserted through the shaft 14 alternately and a fixing bolt 18 is tightened in the upper end of the shaft 14. By putting it in a low frequency induction heating furnace 20, the disks 11 are corrected at flatness of high accuracy efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method and a device for correcting distortions in a ring-shaped punched metal disk, for example a magnetic tissue substrate of an aluminum alloy.

More specifically, in the present invention, a Kinkureki disk punched into a ring shape is pressed in a compressed state. The present invention relates to a method and apparatus for correcting flatness and radius bending to iT'&accuracy.

Conventional technology: In the case of a gold J,% disc made of aluminum or the like that is punched into a ring shape, the bending or radial bending caused by the punching process can be avoided! ! It is necessary to correct the condition before the 111 crystals are released.

(jl=Force surface i! which has been commonly used since then) In the straightening method, as shown in the attached Fig. From 50~
A weight of 200 kg made of iron or the like was placed on top of the steel, and the whole was charged into a heating furnace or the like and heated and straightened.

In the case of such conventional technology, in order to obtain a product with highly accurate flatness, it is necessary to reduce the stacking amount of the materials to be straightened, or to interpose a spacer 4 between the materials to be straightened, or to increase the weight of the weight 3. needs to be made larger.

However, in these prior art methods, there is a risk that the material may be compressed due to overheating or may be deformed due to the human load, and the heating rate is also low, making it inefficient. - Object of the Invention The object of the present invention is to solve the above-mentioned problems of the prior art and to provide a highly accurate and highly efficient method and device for correcting distortion of metal disks.

Structure of the Invention In view of the above object, the present invention provides a method of inserting a plurality of metal disks punched into a ring shape into a rod-shaped body, and heating the metal disks by induction while holding the metal disks in a pressed state. A distortion correction method is provided.

Furthermore, according to the present invention, a rod-shaped body is inserted and mounted by stacking a plurality of metal disks punched in a ring shape through their center holes, and a rod-like body is inserted and mounted at a predetermined thickness every a plurality of spacers inserted through the rod-like body at positions between the metal disks; a means for holding and fixing the metal disk at one end of the rod-like body; and a means for holding and fixing the metal disk at one end of the rod-like body; means for tightening (=J) holding the metal disk and spacer; elastic means disposed between the end of the rod-shaped body and the metal disk to press and compress the metal disk; and the above-mentioned rod-shaped body. A metal disk distortion correction device is provided which includes a low frequency induction heating furnace that surrounds only the outer periphery of a portion of the metal disk inserted through and mounted on the disk.

It is preferable to use a disc spring as the elastic means, and the disc spring is separated from the material to be treated via a heat material and located outside the induction heating furnace, so that the disc spring is not affected by elastic changes due to heating. First, it is preferable to configure the device to press the material to be treated with a constant pressure.

EXAMPLES Hereinafter, the present invention will be explained by examples with reference to the drawings in appendix f.

FIG. 2 shows a cross section of one embodiment of the device according to the invention.

As shown, a metal disk 11 with a hole 12 in the center
are separated by spacers 13 for each predetermined laminated thickness, and are inserted and mounted on a rod-shaped body, i.e., a support shaft 14. It is preferable that the spacer 13 is made of a non-magnetic material and that the amount of heat generated during induction heating is equal to or less than that of the material to be treated.

At the lower end of the support shaft 14 as seen in FIG.
A disc spring 16 having a hole in the center is attached to the fixed seat portion 15, and a ring-shaped W1 heat block I7 is inserted onto the support shaft I4.

A fixing bolt 18 is attached to the upper end of the support shaft 14.
1 lil within 4! ! It is worn.

Therefore, a countersunk spring is placed on the fixing seat 15, the heat insulating block I7 is inserted as shown in the figure, the layers of the spacers 13' and the disks 11 are alternately inserted, and the fixing bolts 18 are tightened. In this state, it is charged into the low frequency induction heating furnace 20.

The heating furnace 20 includes a winding 21 surrounding the metal disk 11 on the support shaft 14, an inner wall 22 made of refractory material, and a tubular support structure 23 surrounding these from the outside.

The support structure 23 may be made of iron since it is located outside the induced magnetic field.

The power used by the heating furnace 20 is set to a commercial frequency or a low frequency lower than that, and induction heating is generated to the inside of the metal disk 11.

Aluminum alloy AA
Strain correction was performed on a 5-inch diameter disk of 5086.

Sixty-two disks were stacked to form four layers each having a thickness of about 150 mm, and were inserted into the support shaft with aluminum spacers interposed therebetween. The compressive force applied to the disk by the countersunk was adjusted to 3000 kg at current temperature.

Three types of tests were conducted using the heating pattern shown in FIG. 3, ie, test (1), test (2), and test (2), and the results are shown in Table 1 in comparison with the results of the prior art method.

In addition, in test ■, the desk after straightening was slowly cooled from 350℃, in test ■, it was slowly cooled from 300℃, and in test ■, it was cooled slowly from 350℃.
It was strongly cooled from 0°C.

Table 1 As shown in Table 1, the method of the present invention corrected distortion and radial bending better than the conventional method in all tests.

As shown in Figure 3, the temperature rise of the countersunk blade is 20°C in both cases.
The temperature was 0°C or lower, and the change in elasticity was small.

The compressive force exerted on the disk due to thermal expansion of the spacer and disk during heating was approximately 5000 kg, and no compressive deformation of the disk was observed.

Effects of the Invention According to the strain correction method of the present invention, a product with high efficiency, low cost, and highly accurate flatness can be obtained with less energy per cost compared to the conventional technology. Therefore, it is easy to adjust the heating temperature to 1illil,
Products of stable quality are required.

Furthermore, the apparatus of the present invention is simple, requires little space, and can be connected to other production equipment.

Furthermore, the thermal stress caused by the difference in the coefficient of thermal expansion between the support shaft and the processed material is also absorbed by the countersunk springs, and a nearly constant compressive force is always applied to the processed material.
A is affected. In addition, since it is an induction method (45 method), automation and mass production can be easily implemented.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a conventional heat straightening method. FIG. 2 shows 1tJi of the distortion correction device according to one embodiment of the present invention.
FIG. Figure 3 shows a case where the method of the present invention is applied)
It is a graph showing a heating pattern of. (Main reference numbers) 11...Metal disk, 13...Spacer, 14...
・Support shaft, 16... Countersunk blade, 17... 1υjchi: Haburonoku, 20... Induction heating furnace Applicant Sumitomo Light Metal Industries Co., Ltd. Agent Patent attorney Tomohiko Arai UC Neichisho Goen: (self-motivated) Showa December 1958, 23Ll qM Director-General'11, Mr. 2, 6th Invention, Distortion Correction Method and Apparatus for Gold ItPr Disc 3.7 City Correction. U Relationship to the incident Ship license 1 Uto Address 11-3, 5-1 Shinbashi, Minato-ku, Tokyo Name (22)
7) Inhabitant Light Metals” i Co., Ltd. Representative Ministry, Physiognomy: Hideo 4, Agent □ Address: Q102, Tokyo, Judai U”-ku, Kojimachi 3-3, New Helmot Building 703 6, Supplementary Statement J Elephant Specification-1 Invention Ij'('Old 7 of Detailed Explanation, ?lli Positive Contents (1) Detailed Seriousness Level 520 (last -1 line) 1' r 3000kg
Correct J to 1-81-8l0 and 1il-.

Claims (2)

[Claims] (1) A method for correcting distortion of metal disks, which comprises inserting a plurality of ring-shaped metal disks into a rod-shaped body and heating the metal disks by induction while holding them in a pressed state. (2) A rod-shaped body that stacks a plurality of metal disks punched in the shape of a link and places them through the tljl hole core; has a cross section that is almost the same as the metal disk, and has a rod-like body that has a cross section that is approximately the same as that of the metal disks, and that a plurality of spacers inserted through the rod-like body at positions between the metal disks; means for holding and fixing the metal disk at 1θj1,1 part of the rod-like body; and a means for holding and fixing the metal disk at the other end of the rod-like body; means for tightening and holding the metal disk and spacer; elastic means disposed between the end of the four-part nine-shaped body and the metal disk to press and tighten the metal disk; A metal disk distortion correction device comprising a low-frequency induction furnace that surrounds only the outer periphery of a portion of the metal disk that is inserted through and mounted on a rod-shaped body.