Method of manufacturing substrate for memory disk

Details Method of manufacturing substrate for memory disk Method of manufacturing substrate for memory disk

1987-10-27

1989-04-25

Larson, Lowell A.

Metal deforming

With 'coating' of work

Metal coating

72359, 72379, 360135, B21D 5300

Patent

active

048235784

ABSTRACT:
A method of manufacturing a substrate for a memory disk characterized in that a blank material comprising a non-magnetic metal substrate covered with a non-magnetic metal as an underlayer is subjected to a coining operation by two dies having flat compressing surfaces within an apparatus including a mandrel and a die ring arranged to limit the spreading extent of the material whereby a surface having ultra-preciseness is obtained.

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