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AssigneesMitsubishi Denki Kabushiki Kaisha, Yamazaki Mazak Corporation
InventorsTomonori Sato, Eiji Hayashi, Yuji Mizukami, Toshiyuki Muraki, Akira Iseki
Estimating the term…
An NC apparatus controls a position of a tool by driving a plurality of shafts with a plurality of servomotors. The shafts includes at least one clamp shaft that can be mechanically clamped or non-clamped. A clamp determining unit determines whether a state of the clamp shaft and outputs a signal based on the state. A correcting unit corrects a position instruction value or a position detection value of at least one shaft other than the clamp shaft based on the signal and a correction value so as to cancel an error in a position of the tool due to movement of the tool performed by the clamp shaft.
A numerical control apparatus including a position instruction generating unit that generates and outputs a plurality of position instruction values indicative of a position of a tool of a numerical control machine tool, a plurality of servo controllers each of which controls a corresponding one of a plurality of servomotors in the numerical control machine tool based on a corresponding one of the position instruction values, and a plurality of detectors each of which detects a rotational position of a corresponding one of the servomotors and feeds back a position detection value indicative of detected rotational position to a corresponding one of the servo controllers, each of the servomotors driving a corresponding one of a plurality of shafts, at least one of the shafts being a clamp shaft that can be mechanically clamped and non-clamped, the numerical control apparatus further comprising:
A numerical control machine tool comprising:
Dependencies are inferred from the claim text.