JPS629859A - Grinding and polishing method of ball - Google Patents

Abstract

PURPOSE:To enable a ball of high degree of true sphericity to be efficiently ground or polished, by providing rotary shafts, which can be adjusted advancing and reversing from three directions, on a ball receiving bed, in the case of the method for grinding and polishing the ball for a ball bearing or the like. CONSTITUTION:A vertical peripheral wall 1b is provided in the peripheral edge part of a circular plate-shaped ball receiving bed 1 hollowing its center part, and rotary shafts 2, 3, 4 being mounted with a 120 deg. space in a manner of penetrating through the peripheral wall 1b, are rotated by motors M through V belts V ad pulleys P. And the rotary shaft, mounting to its point end a grinding or polishing member 5 and rotating interposing a ball 6 from three directions, grinds or polishes the ball while cutting oil is injected from a nozzle 18. The cutting oil returns from a discharge hole 1a of the ball receiving bed 1 to a tank not shown in the drawing. While a machine, regulating the rotary shaft 2 to be advanced and reversed by a handle 13a through a connecting arm 12 and a lever 13 while the rotary shafts 3, 4 to be advanced and reversed through oil hydraulic cylinders 14, connecting arms 15, rods 16 and levers 17, grinds and polishes the ball to be finished in good efficiency and high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for grinding and polishing which makes it possible to obtain spheres with excellent sphericity.

(Prior art) Conventional methods for grinding and polishing balls, etc. of ball bearings include placing the balls on a table, rotating the table, attaching a grinding or polishing member to the tip of a separately provided rotating shaft, and touching the balls. Methods such as grinding and polishing were used.

(Problems to be Solved by the Invention) However, in the above method, there is a single rotation axis and the surface to be ground of the ball is aimed at a small area, which inevitably leads to problems such as poor sphericity and poor work efficiency. There was a point.

Means for Solving the Problems) The present invention has been provided in order to solve the above problems. By protruding the rotating shafts 2, 3, and 4, and attaching a grinding or polishing member 5 such as a grinding wheel or puff to the tips of the rotating shafts 2, 3, and 4, and grinding and polishing the balls 6 on the ball holder 1, the balls can be ground without being fixed. The ball is freely rotated by the rotational force generated during polishing, and is subjected to rolling grinding and polishing to obtain a ball with high sphericity.

(Function) When the ball 6 is ground by the method described above, it becomes
Since it is placed on top, it is ground from three directions by the grinding member 5 at the tip of the rotating shafts 2, 3, and 4, and simultaneously rotates freely due to the grinding force, gradually adjusting the rotating shafts 2, 3, and 4. By protruding, the part that protrudes outside the circumference or spherical surface that connects the surfaces of the grinding member 5 is ground, and the part that is inside the circumference or spherical surface is not ground until other parts are ground to have the same diameter. It is said to be perfectly spherical.

(Effects) As described above, in the ball grinding and polishing method according to the present invention, the grinding or polishing is performed by the grinding member or the polishing member attached to the rotating shaft protruding from three sides, so the work efficiency is very good, and The ball itself rotates faster, but the rotation direction is not limited to the same direction, but the angles of the rotation direction are varied, so the ball can be made with excellent sphericity in a shorter time than before.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

A shows a grinding machine for carrying out this grinding method, and 1 is a ball holder which is shaped like a circular dish, the bottom surface of which slopes downward from the periphery to the center, and the center is where cutting oil is discharged. Hole 1a
is provided so that the cutting oil from the discharge hole returns into a tank (not shown), and a vertical peripheral wall 1b is provided at the periphery.

On the ball pedestal 1, there are rotary shafts 2.3 and 4 that protrude from three directions at positions that approximately divide the circumference into three equal parts, penetrating the peripheral wall 1b, and each rotary shaft 2.3.4 has a V by motor M, respectively.
It is designed to be driven via a belt v and a pulley P.

B indicates a bearing.

Further, each rotating shaft 2.3.4 has a sealing device 7 in a penetrating portion of the peripheral wall 1b of the ball holder 1 to prevent leakage of cutting oil from the core portion.

Further, the rotating shaft 2 is connected to a lever 13 by a connecting arm 12 at the rear end, and can be moved forward and backward toward the center of the ball holder 1 by pushing and pulling a handle 13a of the lever 13.

The other rotating shafts 3 and 4 can be moved forward and backward in the direction of the ball holder 1 by a hydraulic cylinder 14 via a connecting arm 15, a rod 16, a lever 17, etc., and each rotating shaft 2.3 , 4 is attached with a grinding or polishing member 5 depending on the material of the ball and rotated.
A ball 6 is placed on a ball holder 1, and a nozzle 18 radiates cutting oil from a tank onto the ball 6 for grinding or polishing.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a ball grinding machine that is an embodiment of the present invention.
FIG. 2 is a plan view with machine covers omitted. l... Ball holder, 2.3, 4... Rotating shaft, 5...
- Grinding member, 6...ball. Figure 2

Claims (1)

[Claims] Ball grinding, characterized in that a rotary shaft that can be freely adjusted forward and backward from three directions protrudes from a ball pedestal, a grinding member or a polishing member is attached to the tip of the rotary shaft, and the balls on the ball pedestal are ground and polished; Polishing method.