Patent ID: 6597966
Filing Date: 2003-07-22
Classification: G05B,Y02P

Abstract:
A machine tool driving control apparatus for rotating a workpiece about a predetermined axis, and moving at east one of said workpiece and a tool for machining said workpiece, thereby machining said workpiece into a desired shape;said apparatus comprising: reference timing signal generating means for generating a reference timing signal every predetermined rotational angle wit respect to said predetermined axis; reference timing signal counting means for counting the number of times of generation of reference timing signals; position data memory mean for storing position data which are respectively set in correspondence with a plurality of different cumulative numbers of revolutions of said predetermined axis, and representing moving positions of at least one of said workpiece and said tool; workpiece rotational speed hanging means for changing a rotational speed of the workpiece about said predetermine axis into a predetermined rotational speed; and moving position determining means for determining a moving position of at least one of said workpiece and said tool, wherein, said moving position determining means loads said number o times of generation of reference timing signals counted by said reference timing signal counting means, calculates cumulative numbers of revolutions of said predetermined axis from said number of times of generation of reference timing signals, every time said calculated cumulative numbers of revolutions of said predetermined axis reach a given value, reads out position data corresponding to said reached cumulative numbers of revolutions of said predetermined axis and next cumulative numbers of revolutions of said predetermined axis from said position data memory means, divides a difference between said reached cumulative numbers of revolutions of said predetermined axis and said next cumulative numbers of revolutions of said predetermined axis at predetermined timings, determines moving positions of at least one of said workpiece and said tool at said divided timings on the basis of said readout position data, and every time said number of times of generation of reference timing signals reaches a given value corresponding to said predetermined timings, outputs said determined moving positions, and wherein even while a rotational speed change in which the rotational speed about the predetermined axis is changed, at least one of the workpiece and the tool is moved on the basis of the moving position determined by said moving position determining means.