公开(公告)号：US3624338A

公开(公告)日：1971-11-30

申请号：US3624338D

申请日：1970-08-06

Applicant: IBM

Inventor： ELLIS RICHARD E ,  WINTERS HORACE O

IPC: B23H1/02 ,  B23H1/04 ,  B23P1/08

CPC classification number: B23H1/04 ,  B23H1/02 ,  Y10T307/839

Abstract: A control for an EDM machine selectively reverses polarity of the electrical energy supply to the machining electrode. The control consists of double-pole double-throw switching means connected with a polarity reversing transformer and connected such that the energy source is either connected to the electrode directly or through a polarity reversing transformer. In the normal switch position, the polarity is such that the electrode is eroded slowly. In the reverse switch position, the electrode is eroded rapidly. A diode is provided in the servocontrols to allow normal machine operation.

公开(公告)号：FR2408858A1

公开(公告)日：1979-06-08

申请号：FR7829354

申请日：1978-10-09

Applicant: IBM

Inventor： ELLIS RICHARD E ,  SCHWARTZ BRADFORD C ,  THOMPSON JOHN A

IPC: G03G15/08 ,  G03G15/09