Machining device
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United States of America Patent
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Sep 12, 2006
Issued Date -
N/A
app pub date -
Jul 13, 2005
filing date -
Jul 20, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
According to a machining device for machining a conductive workpiece (W) by a conductive (T), when the tool (T) contacts the workpiece (W) in machining, there is formed a closed-circuit (C) connecting the tool (T), the workpiece (W), a brush (315), a conductor (311), a main spindle housing (12), a main spindle (11) and again the tool (T in that order. Alternating-current is inducted to the closed-circuit (C) by a high-frequency generator (314) and an exciting coil (312). As a contact state between the tool (T) and the workpiece (W), impedance of the closed-circuit (C) is changed and then the alternating-current is changed, so that induction current is generated at a detector coil (313), thus monitoring and controlling the contact state by way of the induction current. Since a light contact state can constantly be maintained in machining according to a monitoring condition including a light/heavy contact-determining threshold, cutting resistance will not increase, thereby preventing damage on the tool (T) and deterioration in machining accuracy.
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