Electric heating – Metal heating – Wire – rod – or bar bonding
Patent
1991-11-25
1993-05-18
Shaw, Clifford C.
Electric heating
Metal heating
Wire, rod, or bar bonding
21913033, B23K 900
Patent
active
052123618
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.
REFERENCES:
patent: 4390771 (1983-06-01), Kurtz et al.
patent: 4482794 (1984-11-01), Kurts et al.
patent: 4687897 (1987-08-01), McKeil, Jr.
patent: 4866247 (1989-09-01), Parks et al.
Kawabata Kazuhiro
Miyazaki Naoki
Mitsubishi Denki & Kabushiki Kaisha
Shaw Clifford C.
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