Method of manufacturing metal substrates for disk for memory storage media
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United States of America Patent
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May 2, 1989
Grant Date -
N/A
app pub date -
Oct 27, 1987
filing date -
Dec 28, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for manufacturing a metal substrate for a memory disk wherein a metal blank material (6) is sandwiched between two dies within a metal mould (3) limiting the extent to which the material spreads, using a core member (4) if necessary, each of the dies having a flat and smooth working surface, the compression force and sheet gauge reduction ratio being regulated or the surface roughness and amount of coating lubricants employed being regulated.
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