Electric heating – Metal heating – Cutting or disintegrating
Patent
1992-01-30
1993-09-21
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
425 281, B23H 900
Patent
active
052471519
ABSTRACT:
A process for making from a mold segment blank (11) a metal tire mold (10) having a tread contour surface (15) corresponding to the outer circumference of a tire to be molded and having a plurality of finished projections (16, 17) on the tire tread contour surface having sides oriented substantially normal to the tire tread contour thereat, comprising the steps of generating a three-dimensional representation of the tread contour surface and the finished projections, machining an electrode (35) for electric discharge machining apparatus having slots (42, 43) of greater dimensions than the finished projections for forming initial projections of greater dimensions than the finished projections, mounting the electrode and the mold segment blank in the electric discharge machining apparatus, generating an electric discharge between the electrode and the mold segment blank, effecting relative motion between the electrode and the mold segment blank substantially radially of the mold segment blank for forming the initial projections, and relatively orbiting the electrode and the mold segment blank for bringing the initial projections to the orientation and configuration of the finished projections and effecting finishing on the surfaces thereof.
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"Sink The Unthinkable" Flyer, Mitsubishi International Corporation, EDM Division.
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