JPH1034526A - Mirror polishing method of circular rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To high accurately polish circularity, cylindricity and a diametric mutual difference of a round bar product of rotary machine main shaft, roller for roller bearing, rolling unit for a needle bearing, etc. SOLUTION: In a lapping polishing machine, a round bar 1 as workpiece is made to rotate around on a radial surface of a rotary surface plate 2, in a peripheral location A or internal peripheral location B of the rotary surface plate 2 where the direction of rotation of a load surface plate 3 is equal to the rotary surface plate 2, by generating a rotational peripheral speed of the load surface plate 3 faster than the rotary surface plate 2, while always forcing rolling force of rotating on its own axis in one direction to the round bar 1, by polishing, the round bar of good circularity and cylindricity is obtained. By repeating rearrangement in a carrier 5 of the round bar 1, a diametric mutual difference can be made approximate to 0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

This invention is intended for circular rod parts requiring high accuracy such as surface roughness, roundness, cylindricity, diameter difference, etc., mainly for rotating machine spindles, roller bearing rollers, and needle bearings. The present invention relates to a method for polishing an outer peripheral surface of a moving body or the like.

[0002]

2. Description of the Related Art Conventional round bar parts are made of metal and polished by a centerless polishing machine using fixed abrasive grains. In recent years, there has been a demand for a ceramic rod part which is lighter in material than metal and has excellent wear resistance. In order to obtain high-precision dimensions and surface roughness, abrasive grains need to be polished with a fine grindstone, but in the case of hard ceramic polishing, if the abrasive grain size of the grindstone is made fine, a sufficient cutting amount can not be obtained, The whetstone escaped and a high-precision one could not be obtained.

[0003]

Therefore, it has been considered that the polishing is performed by a lapping polishing machine of a free abrasive polishing method from a centerless polishing machine of a fixed abrasive polishing method. However, since the conventional lapping grinder is intended for polishing a flat surface, in the polishing of a circular bar, the circular bar is rotated only by the frictional resistance between the rotating platen and the workpiece, and the circular bar is rotated due to the rotation. Since the polishing was repeated by stopping and rolling, the polishing was not performed uniformly, but was performed in a polygonal shape, and sufficient roundness and cylindricity could not be obtained. The present invention is designed to eliminate such disadvantages.

[0004]

SUMMARY OF THE INVENTION In a lapping machine in which a carrier (5) or the like revolves a circular bar (1) on a radial surface of a rotating platen (2), a load platen (3) is used as a rotating platen (2). ) At the outer peripheral portion (A) or the inner peripheral portion (B) of the rotary platen (2) in contact with the circular rod (1), which has the same rotational direction as the rotational speed of the load platen (3), The rotation speed is higher than the rotation peripheral speed of the rotation platen (2). Conversely, when the rotation of the load platen (3) is slower than the peripheral speed of the rotation platen (2), the rotation of the circular rod (1) is stopped, so that it is not polished to a perfect circle.

[0005]

[Function] While the circular bar (1) revolves on the radial surface of the rotary platen (2), the peripheral speed difference between the rotary platen (2) and the load platen (3) always rotates on the circular plate (1). And the rotation of the circular rod (1) does not stop. During this time, the outer circumference of the circular rod (1) is polished by sliding between the circular rod (1) and the rotary platen (2) via loose abrasive grains. The circular plate (1) rolls between the rotating platen (2) and the load platen (3), and the convex portion is strong and is polished quickly. Come.

[0006]

【Example】

First Embodiment FIG. 1 is a perspective sectional view showing a first embodiment. Fixing ring (4) on radial surface of rotating platen (2) with lapping grinder
And a carrier (5) in which the disk (1) is cut out at equal intervals in order to arrange the disk (1) so that it revolves on the radial surface of the rotary platen (2). )Put. Place the rod (1) in the cut out hole of the carrier (5).
Place the load platen (3) on the circular bar (1). The rotating platen (2) is rotated counterclockwise, and the load platen (3) is also rotated counterclockwise at a constant speed. At this time, the peripheral speed of the surface of the load platen (3) in contact with the circular bar (1) is faster than the peripheral speed of the outer peripheral portion (A) of the rotary platen (2) with which the circular bar (1) is in contact. I do. The rotating force in one direction is always forced by the difference between the peripheral speeds of the rotating platen (2) and the load platen (3) below the circular plate (1), so the rotation of the circular plate (1) is stopped and polished. It becomes a perfect circle.
By taking out the circular rod (1) from the carrier (5) at a certain time during the polishing, and repeatedly changing the arrangement in the carrier, it is possible to make the diameter phase difference of the circular rod (1) close to zero. . After processing the centerless rough polished product with a 6μm diamond slurry using a lapping polisher, the medium finish is 3μm diamond slurry and the final polishing is 1μ.
Polished using diamond slurry.

Second Embodiment FIG. 2 is a perspective sectional view showing a second embodiment. The rotation direction of the rotary platen (2) is counterclockwise as in the embodiment (1), but the load platen (3) is clockwise. In this case, the rotation peripheral speed of the load platen (3) is higher than the rotation peripheral speed of the rotation platen (2) at the inner diameter portion (B) of the rotation platen (2) where the rotation direction is the same.

[0008]

As a result of processing an alumina ceramic rod having an outer diameter of φ7 and a length of 19.5 by the lapping polishing method according to the present invention, the circularity is 0.8 μm, the cylindricity is 0.8 μm, and the difference between the diameters is 0.8 μm. It was possible to obtain an accuracy of 1 μm or less, a surface roughness of 0.02 Ra, and an ultraprecision grade of rollers for roller bearings.

[Brief description of the drawings]

FIG. 1 is a perspective sectional view showing a first embodiment.

FIG. 2 is a perspective sectional view showing a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circular bar 2 Rotating surface plate 3 Load surface plate 4 Correction ring 5 Carrier A Outer peripheral region where circular disk of rotating surface plate contacts B Inner peripheral region where circular plate of rotating surface plate contacts

Claims (1)

[Claims] 1. A wrapping machine in which a carrier (5) or the like revolves a circular rod (1) on a radial surface of a rotary platen (2), wherein a load platen (3) has the same rotation as the rotary platen (2). At the outer peripheral portion (A) or inner peripheral portion (B) of the rotating platen (2) in contact with the circular bar (1), the rotating peripheral speed of the load platen (3) is It is characterized in that it is faster than the rotational peripheral speed of 2).