Wire electrical discharge machining apparatus

Electric heating – Metal heating – Cutting or disintegrating

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Details

204297R, 219 69R, 428677, B23H 100, B23H 702

Patent

active

047773405

ABSTRACT:
A wire electrical discharge machining apparatus which cuts to a desired shape a workpiece placed on a workpiece table, using a discharge phenomenon occurring between the workpiece and a wire electrode opposite to the workpiece with a machining fluid in a space therebetween, characterized in that the workpiece table is made of cast iron having a coefficient of thermal expansion of less than 6.times.10.sup.-6 /.degree.C. and that a surface layer is provided on the workpiece table on which a workpiece is placed, the surface layer having corrosion resistance to the machining fluid and having a hardness higher than that of the material constituting the workpiece table.

REFERENCES:
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patent: 3469058 (1969-09-01), O'Connor
patent: 3772058 (1973-11-01), Bloom
patent: 4084074 (1978-04-01), Gilleland et al.
patent: 4339650 (1982-07-01), Tanaka et al.
patent: 4517217 (1985-05-01), Hoffman
patent: 4557981 (1985-12-01), Bergmann
patent: 4625085 (1986-11-01), Yoshida et al.

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