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:
May. 18, 1993
Filed:
Nov. 25, 1991
Naoki Miyazaki, Fukuoka, JP;
Kazuhiro Kawabata, Fukuoka, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of forming a ball on the end of a wire by electrical discharge between the wire and an electrode includes detecting the discharge voltage and discharge current of an electrical discharge between an end of a wire having a diameter and an electrode; multiplying the discharge voltage by the discharge current for respective time intervals during the discharge to compute the heat energy supplied in the discharge during each time interval; integrating the heat energy for the time intervals during a discharge to determine the total heat energy supplied during the discharge; comparing the total heat energy with a predetermined heat energy that produces a ball on the end of the wire, the ball having a diameter of about two to three and one-half times the diameter of the wire; and controlling at least one of the discharge voltage, current, and duration in accordance with the comparison and terminating the discharge when the total heat energy supplied to the discharge exceeds the predetermined heat energy.