The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 29, 1996
Filed:
Jun. 20, 1995
Yasushi Fukuzawa, Tokyo, JP;
Abstract
An insulating material is electric discharge machined with high dimensional accuracy at a high speed, by closely adhering mesh-shaped electroconductive material 5 onto the surface of an insulating material 1 so as to form an electroconductive layer 6 at the initial stage of electric discharge. In the advancement of electric discharge, fresh electroconductive layers 9, 10 are continuously formed at the bottom and the side surface of a hole 8, so that the electric discharge machining is continued even after the hole 8 becomes deeper. A porous preformed body composed of fine metal wires or a complex body containing needle metal may be used instead of the mesh-shaped electroconductive material 1. Thus, electric discharge machining is performed at a high speed, and a machined surface excellent in flatness can be obtained with high dimensional accuracy.