Method for manufacturing tire molding metal molds with a two-sta

Details Method for manufacturing tire molding metal molds with a two-sta Method for manufacturing tire molding metal molds with a two-sta

1982-11-03

1984-09-11

Envall, Jr., Roy N.

Electric heating

Metal heating

Cutting or disintegrating

219 69E, B23P 108, B23P 120

Patent

active

044712006

ABSTRACT:
A method of making a mold which is utilized to manufacture a tire, the mold having a contour curved surface with broad bone portions and narrow blade portions extending therefrom, comprises a first machining stage utilizing a plurality of electrical discharge machining electrodes for approaching a workpiece used to make the mold, at different angles. Each of the electrodes used in the first machining stage are shaped to avoid the removal of excessive metal from the mold so that both the bone portions and the blade portions can extend normally from the contour curved surface. The method includes a second machining stage utilizing a further electrical discharge machining electrode which has recesses for receiving bone portions and blade portions formed by the first stage electrodes, and is movable laterally of the contour surface to form well-defined edges of the bone and blade portions.

REFERENCES:
patent: 2587297 (1952-02-01), Duerksen
patent: 3370147 (1968-02-01), Matulaitis
patent: 3443054 (1969-05-01), O'Connor
patent: 3694610 (1972-09-01), Saito et al.
patent: 3806691 (1974-04-01), Roach
patent: 3959929 (1976-06-01), Fleischmann et al.
patent: 4316071 (1982-02-01), Bonga

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