Method of processing base plate for magnetic disc

Details Method of processing base plate for magnetic disc Method of processing base plate for magnetic disc

1988-11-03

1989-09-26

Jones, David

Metal deforming

By shot-blasting

51320, B24C 100

Patent

active

048690902

ABSTRACT:
A method for forming a fine unevenness over a surface of a base plate (9) for a magnetic disc comprises the step of bombarding the surface of the base plate (9) with a jet of gas mixed with fine ice particles (4) that are formed by mixing a flow of fine pure water droplets from a spray (2) and a counter directed flow of nitrogen gas cooled by being bubbled through a quantity of liquid nitrogen held in a reservoir (6). The obtained unevenness can be controlled by varying the size of the ice particles, the jet pressure, the distance between the jet nozzle providing the size of the ice particle jet and the receiving surface of base plate (9), the duration of spraying and the spraying angle with respect to the base plate.

REFERENCES:
patent: 4038786 (1977-08-01), Fong
patent: 4703590 (1987-11-01), Westergaard
patent: 4707951 (1987-11-01), Gibot et al.

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