Electric heating – Metal heating – Cutting or disintegrating
Patent
1987-09-29
1988-10-11
Paschall, M. H.
Electric heating
Metal heating
Cutting or disintegrating
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.
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patent: 4517217 (1985-05-01), Hoffman
patent: 4557981 (1985-12-01), Bergmann
patent: 4625085 (1986-11-01), Yoshida et al.
Kobayashi Minoru
Shinkai Masaru
Tanahashi Seiichi
Evans Geoffrey S.
Mitsubishi Denki & Kabushiki Kaisha
Paschall M. H.
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