JPS595435A - Polishing method of magnetic disk - Google Patents

Abstract

PURPOSE:To improve the polishing efficiency of a disk surface, by constituting so that a polishing roll obtained by forming a layer of ceramics and/or sintered hard alloy on the surface by plasma explosion thermal spraying is rotated so as to be held at a constant interval from the disk surface. CONSTITUTION:A layer of ceramics, a sintered hard alloy or their mixture, which uses an iron roll as a base material and is formed on its surface by plasma explosion thermal spraying consists of a fine scale-like pattern. Accordingly, in the same way as a ceramic roll made by a usual melting method is used, even if polishing is executed at a constant interval from the surface without pressing it against the surface of a magnetic disk, a sufficient polishing effect can be obtained. Also, the disk surface is not damaged at all. In this way, the polishing efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of polishing a magnetic disk having extra protrusions on its surface.

Before being commercialized, a magnetic disk has extra protrusions on its surface. Conventionally, the method of polishing a magnetic disk to remove such protrusions involves fixing the magnetic disk on a disk rotating at high speed, and simply pressing a ceramic roll or blade, or a wrapping film embedded with an abrasive onto the surface of the disk. However, each method has its advantages and disadvantages and cannot be said to be a sufficient method. For example, methods using rolls or blades have the disadvantage that the polishing effect is insufficient or the rolls or blades are subject to severe wear.
On the other hand, the method using a wrapping film has the disadvantage that the abrasive that falls off from the wrapping film intervenes between the film and the magnetic disk, causing scratches on the disk surface.

An object of the present invention is to provide a method for polishing a magnetic disk, which provides a sufficient polishing effect despite using a roll method, causes less wear on the rolls, and does not damage the disk surface.

The method of the present invention is a magnetic disk polishing method in which a magnetic disk having extra protrusions on the surface is fixed on a disk rotating at high speed, and the surface is polished with a polishing roll to remove the excess protrusions. A method of polishing using an iron roll having a ceramic and/or cemented carbide layer formed by plasma explosion spraying on the surface, and rotating the polishing roll one by one while keeping a constant distance from the magnetic disk surface. It is characterized by carrying out the following.

The ω polishing roll used in the present invention has an iron roll as a base material, and is made by plasma explosion spraying ceramic, cemented carbide, or a mixture thereof onto the surface thereof. The ceramic and/or cemented carbide layer thus formed consists of a fine scale-like pattern. Because of this scale-like pattern, polishing can be performed at a certain distance from the surface of the magnetic disk instead of pressing it against the surface of the magnetic disk, as is the case when using a ceramic roll made by the usual melting method. A sufficient polishing effect can be obtained, and of course the disk surface will not be damaged. The appropriate thickness of this layer is 20 to 200 degrees. 7 ceramics and 81 hard alloys may be those commonly used. For example, a sintered carbide alloy is used as the cemented carbide.

The polishing roll of the present invention has, for example, ht, o, D-GU N (DETONAT
IONGUN) method, the thickness is 15mm by gas explosion spraying.
This can be obtained by forming a layer of about 0P.

The polishing roll of the present invention manufactured as described above is placed at a certain distance from the surface of the magnetic disk and is rotated to perform polishing. This gap varies depending on the height of the extra protrusions present on the surface of the magnetic disk, and is generally about 0.1 to 1 .mu.m. Note that there are no particular limitations on the rotational speed of the roll or disk.

By performing polishing using the polishing roll of the present invention in the manner described above, protrusions on the disk surface can be efficiently removed.

Claims (1)

[Claims] 1. In the magnetic disk ωtR method, which identifies a magnetic disk with extra protrusions on its surface on a disk rotating at high speed, and polishes the surface with a 01 polishing roll to remove the excess protrusions, the ωtR method described above Polishing is carried out by using an iron roll having a layer of ceramic and/or cemented carbide formed on the surface by plasma explosion spraying, and by rotating this polishing roll at a fixed distance from the surface of the magnetic disk. How to understand the # of a magnetic disk, which is a symbol of f.