JPS60127973A - Preparation of polishing plate - Google Patents

Abstract

PURPOSE:To smooth even the minute uneveness formed onto a testing head, etc. for a magnetic disc through polishing by forming a coating layer of the mixture of polishing particles and binder onto a substrate and solidifying the coated layer and applying lubricating agent onto the coated layer. CONSTITUTION:The alumina particles N1-N3 as polishing particles are mixed and kneaded with thermoplastic resin or thermosetting resin as binder, and thinner as solvent, and the mixture is applied into a layer J having a certain thickness through the spin coating onto a disc-shaped substrate B, and then baked. After the baking is completed, flourine-series lubricating agent F is applied onto the upper surface of the resin layer J, and a polishing plate for polishing a testing head, etc. used for the endurance test for a magnetic disc is prepared. Therefore, when the above-described head, etc. is polished, the exposed part from the resin layer J of the alumina particles N1-N3 contacts with the uneven parts of the head, etc., and a smooth surface is obtained through grinding. In this case, the lubricating-agent layer F serves to prevent the head, etc. from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Technical Field of the Invention The present invention relates to a method for manufacturing a polishing plate for polishing test nodules and the like used in durability tests of magnetic disks.

(B) Background of the technology Regarding magnetic disks (hereinafter referred to as disks), which have a magnetic recording layer on a substrate and magnetically record information and read recorded information, when recording and reading this information, A magnetic head (hereinafter referred to as a head) is placed facing the rotating disk, and information is recorded on this magnetic recording layer.
Information is read from this magnetic recording layer.

During a recording or reading operation, the head flies and does not make contact with the disk, but when starting up, stopping, or when a failure occurs, the head flies up and does not make contact with the disk.
The head and disk may come into contact.

For this reason, the impact resistance of the disk is tested using a pseudo head, but in this test, not only the disk but also the pseudo head is damaged, and subsequent test disks are subject to conditions that make them susceptible to damage due to this damage. Therefore, the impact resistance is evaluated to be low.

Therefore, in the impact resistance test, it is necessary to polish the damaged hemlock. Conventionally, such heads have not been polished.

(D) Object of the Invention An object of the present invention was to provide a method of manufacturing a polishing plate that can smooth even minute irregularities occurring on a head by polishing.

(E) Structure and object of the invention According to the present invention, after forming a coating layer of a mixture of abrasive particles and a binder on a substrate, the coating layer is solidified and a lubricant is applied to the coating layer. This is achieved by providing a method for manufacturing an abrasive plate characterized by the following.

(F) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

Alumina particles are mixed and kneaded with a thermoplastic resin or a thermosetting resin and a thinner, and a layer J having a constant thickness is formed on a disc-shaped substrate 13 using a spin cord, and then fired.

The resin composition was 50% by volume of epoxy resin, 30% by volume of phenol resin, 20% by volume of melamine resin, and 30% by volume of alumina particles.

The firing conditions were 200° C. for 1 hour.

The thermoset or thermoplastic resin serves as a binder and the thinner is used as a solvent. After the firing process is completed, a fluorine-based lubricant F (for example, Krytonoxco brand name) is applied to the upper surface of the resin layer.

This lubricant is impregnated into the resin layer J.

The drawing is a cross-sectional view of the abrasive disk manufactured in this manner, in which alumina particles N, N2, . N3--- is mixed.

Alumina particles N,, N2. Depending on the particle size, some of the N5 particles are buried in the resin layer J, and some of the particles are partially exposed.

A lubricant film F is formed on the resin 1ifJ surface and the exposed alumina particle surface and serves as a 7riJ lubricant.

When polishing the head, the exposed portions of the alumina particles from the resin layer J come into contact with the uneven portions of the head and are ground to make the uneven portions into smooth surfaces. In this case, since there is a lubricant layer F, there will be no major damage to the throat to be polished, and
Even if the lubricant appearing on the surface disappears during polishing, the lubricant impregnated in the resin NJ oozes out onto the surface of the resin rJJ, so the surface of the resin layer 5 is always covered with the lubricant layer F. .

(G) Effects of the Invention As described above, the method for manufacturing an abrasive plate according to the present invention can form a polishing surface having minute protrusions necessary for polishing damage including minute irregularities that occur on a magnetic head. It is useful for manufacturing abrasive plates for edges and throats used in abrasion resistance tests.

[Brief explanation of the drawing]

The figure is a sectional view of a polishing plate according to the present invention. B: substrate, J: resin layer, F: lubricant layer, N. N2. N3-'-: Alumina particles. " \ (

Claims (3)

[Claims] (1) A method for manufacturing an abrasive plate, comprising: forming a coating layer of a mixture of abrasive particles and a binder on a substrate, solidifying the coating layer, and applying a lubricant to the coating layer. . (2) The method for manufacturing an abrasive plate according to claim (I), wherein the binder is a thermosetting resin or a thermoplastic resin. (3) The method for producing an abrasive according to claim (1) or (2), wherein the lubricant is a fluorine-based lubricant.