METHOD OF CONTROLLING FEED AXES IN MACHINE TOOL, AND MACHINE TOOL PERFORMING MACHINING BY USING THE METHOD OF CONTROLLING FEED AXES

摘要

Maximum values of actual machining allowances of a workpiece in respective cutting flutes are averaged by control amounts of respective cutting flutes calculated by an arithmetic unit. The arithmetic unit converts the calculated control amounts into an amount in each axis direction and subtracts the value from a feed axis command value in an NC program stored in a storage unit. Then, a numeral value control unit performs machining by controlling respective feed axes based on the subtracted feed axis command value.

主权项

1. A method of controlling feed axes in a machine tool, wherein
the machine tool machines a workpiece by rotating a tool, the tool including a plurality of tiers having a plurality of cutting edges arranged on concentric circles in an axis direction, the method comprising steps of: calculating increment or decrement of machining allowances of a workpiece which is actually machined by respective cutting edges based on previously measured runout amounts of the cutting edges; calculating control amounts whereby maximum values of the machining allowances in respective cutting flutes are averaged; and superimposing control of slightly displacing the feed axes in an opposite direction of machining while machining is performed, based on the control amounts.