Feed shaft control method and numerically controlled machine tool
AssigneeMakino Milling Machine Co., Ltd.
InventorMitsunari ODA
Life of this patent
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Abstract
A numerically controlled machine tool in which a numerical control program acquired from a reading and interpreting unit of a numerical control device is executed by a distribution interpolating unit and servo control units, to drive a feed shaft configured from a coarse movement mechanism and a fine movement mechanism, causing a tool to move relative to a workpiece, and thereby machining the workpiece, wherein the difference between a movement command for the feed shaft, and an output value which varies on the basis of said movement command is obtained, a movement command for the coarse movement mechanism is generated on the basis of said movement command, and a movement command for the fine movement mechanism is generated on the basis of said difference.
Claims8
A method of controlling a feed axis of a machine tool configured to drive the feed axis composed of a coarse motion mechanism and a micro-motion mechanism so as to move a tool and a workpiece relatively to each other, whereby to machine the workpiece, characterized by comprising:
- obtaining differences between move commands and output values changeable based on move commands;
- generating move commands for the coarse motion mechanism based on the move commands;
- and
- generating move commands for the micro-motion mechanism based on the differences.
A method of controlling a feed axis of a machine tool configured to drive the feed axis composed of a coarse motion mechanism and a micro-motion mechanism so as to move a tool and a workpiece relatively to each other, whereby to machine the workpiece, characterized by comprising:
- generating move commands for the coarse motion mechanism by passing move commands for the feed axis through a filter adapted to make acceleration continuous;
- driving the coarse motion mechanism by the move commands for the coarse motion mechanism;
- obtaining move commands for the micro-motion mechanism based on the differences between the move commands for the feed axis and the move commands for the coarse motion mechanism;
- and
- driving the micro-motion mechanism by the obtained move commands for the micro-motion mechanism.
A numerically controlled machine tool configured to run a numerical control program, from a reading and interpreting section of an NC device, in a distributing section and a servo-control section so as to drive a feed axis, composed of a coarse motion mechanism and a micro-motion mechanism, so that a tool and a workpiece are moved relative to each other, whereby the workpiece is machined, the numerically controlled machine tool performing:
- obtaining differences between move commands and output values changeable based on move commands;
- generating move commands for the coarse motion mechanism based on the move commands;
- and
- generating move commands for the micro-motion mechanism based on the differences.
Dependencies are inferred from the claim text.