JPS5810445A - Side surface maching method for workpiece - Google Patents

Abstract

PURPOSE:To reduce the vibration of a workpiece during machining by shifting the position of a fixing shaft of a pair of grinding stones in vertical and opposite directions by the same distance based on the position of a fixing shaft of a workpiece and by rotating the grinding stones in the same direction. CONSTITUTION:The fixing shafts 15 and 16 for grinding stones 17 and 18 are shifted in the vertical direction by the same distance based on a fixing shaft 14 of a workpiece W. Therefore, the grinding stone 17 is brought into contact with a slightly lower part of one side of the workpiece W positioned for grinding, while the grinding stone 18 is brought into contact with a slightly upper part of the other side of the workpiece W. If the grinding stones 17 and 18 are respectively rotated in the same direction, for example, conter-clockwise direction, one side surface of the workpiece W is machined in the lower direction while the the other side surface is machined in the upper direction. By machining in this manner, cutting resistance to the workpiece W occurs in different positions and as a result, cutting torque acts in different directions, thereby inhibiting the generation of vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for side-grinding a thin steel plate such as a brake disk, and particularly to a method for side-grinding a workpiece in which vibration during grinding is reduced as much as possible.

Conventionally, there are a surface grinding method and a cylindrical grinding method as methods for grinding the side surface of a brake disk or the like. In the surface grinding method, a pair of rotating shafts with grinding wheels attached are arranged so that the end surfaces of each grinding wheel face each other, and the workpiece is held between the end surfaces of the grinding wheels and ground. It is not suitable for processing thin steel plates such as brake desks because the grinding wheels cannot be spaced close to each other on the plate. For this reason, the cylindrical grinding method is mainly used to process thin steel plates.

This cylindrical grinding method uses a pair of grinding wheels 10 as shown in FIG.
0.100 are arranged with their circumferential surfaces facing each other, and the mounting axes 101 and 101 of each grindstone are on the same plane as the mounting axis of the workpiece W, and the workpiece W is sandwiched between the circumferential surfaces of these grindstones. Both sides of the workpiece are simultaneously ground by rotating the respective grinding wheels 100°100 in opposite directions. However, in the conventional cylindrical grinding method, parts of the same height on both the front and back sides of the workpiece are ground in the same direction, so cutting resistance against the workpiece is generated at the same position, and cutting torque also acts in the same direction. Therefore, this causes vibration. Therefore, it is not possible to perform a uniform grinding process, resulting in problems such as variations in the product.

In view of the above-mentioned problems, the present inventor has devised the present invention to effectively solve the problem.The purpose of the present invention is to reduce the vibrations generated during grinding as much as possible and improve the machining accuracy. An object of the present invention is to provide an improved side surface grinding method for a workpiece.

In order to achieve such an object, the present invention uses a so-called cylindrical grinding method in which the positions of the mounting axes of a pair of grinding wheels that hold a workpiece and whose peripheral surfaces face each other are moved in opposite directions and in opposite directions with respect to the position of the workpiece's mounting shaft. The rotation direction of each grinding wheel is shifted by the same distance,
The gist of this is that the grinding is done with the same values.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a plan view of a grinding device used to carry out the method of the present invention, and FIG. 2 is a side view of the same device.

The grinding device 1 has fixed stands 3, 3 spaced apart left and right (in the vertical direction in FIG. 1) on a base 2, and a grindstone that is movable in the left and right directions by a handle 3a is mounted on the fixed stands 3.3. Tables 4 and 5 are placed there. A support base 6 is provided in front of these fixed bases 3, 3 (on the right side in FIG. 1), and an index table 8 rotated by a cylinder unit 7 is arranged on this support base 6. A pair of work rotation members 9, 9 are placed on top.

Further, a positioning table 10 for the workpiece W is rotatably attached to one side of the support stand 6, and a mounting table 11 is extended from the other side of the support stand 6. Presser foot 12
A cylinder unit 13 equipped with a cylinder unit 13 is fixed.

Thus, the workpiece W placed on the positioning table 10
When the table 10 rotates upward, the work rotating section. This state is maintained by fitting the material 9 onto the mounting shaft 14 and using a chuck or the like.

Then, as the index table 8 rotates 1800 times, the workpiece W fixed to the mounting shaft 14 of the workpiece rotation member 9 is set in the grinding device.

Further, the grindstone mounting bases 4 and 5 are provided with a grindstone mounting shaft 15.

16, and attach it to the front end of this mounting shaft 15.16.
□Disc-shaped grinding wheels 17 and 18 are polished with their respective peripheral surfaces
Mounted so as to face each other at one position, and further mounted on the mounting shaft 15.
.

Pulleys 19 and 20 are inserted into the rear end of 16, and motors 21 and 22 are mounted on the pulleys 19 and 20 and the mounting bases 4 and 5.
By connecting the belts 23 and 24, the grindstone 17.
18 is rotated.

The above-mentioned respective mounting shafts 15 and 16 are shown in FIGS. 2 and 3.
As is clear from the figure, the work W is shifted by the same amount in the vertical direction with respect to the mounting shaft 14 as a reference. Therefore, the grinding wheel 17 hits a slightly lower part of one side W1 of the workpiece W in the grinding position, and the grinding wheel 1B hits a slightly upper part of the other side W2 of the workpiece W. If the workpiece is rotated in the direction shown in FIG. Since the cutting torques are generated at different positions and the cutting torques also act in different directions, the generation of vibrations is suppressed.

The effects of the method of the present invention will be made clearer through specific experimental examples below.

A whetstone made of white arundum with a diameter of 600 m and a thickness of 40 m was attached to the above device, and a grindstone made of SUS 16
Made of Cr, diameter 270 ttm, thickness 5III
The I+ workpiece was ground at a grindstone rotation speed of 80 rpm. The results are shown in Figure 4. When the distance between the axes of the grinder and stone is approximately 6.5 m, the runout width becomes almost zero, which is different from the conventional method, that is, when the distance between the axes is approximately 6.5 m. It can be seen that when the distance is set to Om, a very remarkable effect is exhibited compared to the case where the width of vibration in the horizontal direction was 25μ and the width of vibration in the vertical direction was 17μ.

As is clear from the above description, according to the present invention, in the so-called cylindrical grinding method, the mounting axes of a pair of grinding wheels, that is, the center of rotation, whose circumferential surfaces face each other at the grinding position, are aligned with the mounting axes of the workpiece, that is, the position of the rotation center. Since the center of rotation of the workpiece is used as a reference, the grinding wheels are shifted the same distance in opposite directions, and the rotating direction of each grindstone is the same, so the cutting torque is different on both the left and right sides of the workpiece. Therefore, even if there are variations in the amount of grinding on each side, they are canceled out and the vibration of the workpiece is absorbed, reducing the vibration of the workpiece during grinding as much as possible, thereby improving grinding accuracy. , it is possible to extend the life of the grindstone.

[Brief explanation of drawings]

The drawings show an example of the apparatus used to carry out the method of the present invention. Fig. 1 is a plan view of the grinding apparatus, Fig. 2 is a side view of the same apparatus, and Fig. 3 is a simplified illustration of the main parts of Fig. 2. FIG. 4 is a diagram showing experimental results, and FIG. 5 is a diagram similar to FIG. 3 showing a conventional example. In the drawing, reference numeral 14 indicates a mounting shaft of the workpiece, 15.16 indicates a mounting shaft of a grindstone, 17.18 indicates a grindstone, W indicates a workpiece, and W2 indicates a side surface of the workpiece. Patent applicant Press Giken Kogyo Co., Ltd.

Claims (1)

[Claims] In a grinding method in which a workpiece is held between a pair of opposing grinding wheels and both sides of the workpiece are ground by the peripheral surfaces of these grinding wheels, the position of the mounting shafts of the pair of grinding wheels is based on the position of the mounting shaft of the workpiece. A method for side-grinding a workpiece, in which each grindstone is shifted the same distance in opposite directions, and the rotational force and direction of each grindstone are the same.