CONTROL FOR PROCESSING UNIT AND CONTROL METHOD FOR PROCESSING UNIT

Abstract

Control system for a machining device (1), wherein the machining device (1) comprises a table (3) which holds a workpiece (W), a main shaft (2) which holds a cutting tool (T), a first feed motor (5) which moves the table (3) and the main shaft (2) relative to each other in a first direction parallel to a longitudinal axis of the main shaft (2), a second feed motor (6) which moves the table (3) and the main shaft (2) relative to each other in a second direction intersecting the longitudinal axis, and a main shaft motor (4) which rotates the main shaft (2) about the longitudinal axis, wherein the control system comprises: a control unit (7b) which controls the first feed motor (5) to move a distal end of the tool (T) between a retracted position in which the distal end of the tool (T) is withdrawn from the workpiece (W), and to move a predetermined depth position in the workpiece (W), controls the second feed motor (6) to position each of a plurality of cutting positions of the workpiece (W) relative to the tool (T), and controls the main shaft motor (4) to control the rotation of the tool (W), wherein the control unit (7b) successively repeatedly performs a cutting step to carry out a cutting operation at one of the cutting positions by moving the distal end of the tool (T) from the retracted position to the predetermined depth position while rotating the tool (T) in a normal direction, a retraction step to withdraw the tool (T) from the workpiece (W) by moving the distal end of the tool (T) from the predetermined depth position to the retracted position without stopping while rotating the tool (T) in the opposite direction, and a positioning step to position a subsequent position of the cutting positions relative to the tool (T) and changing a direction of rotation of the tool (T) from the opposite direction to the normal direction and wherein the control unit (7b) further performs a process comprising Initiating a relative movement between the workpiece (W) and the tool (T) during the positioning step at the same time as the distal end of the tool (T) passes a reference position between the workpiece (W) and the retracted position during the retraction step; completing the relative movement between the workpiece (W) and the tool (T) during the positioning step at the same time as the distal end of the tool (T) passes the reference position during the cutting step; and controlling a termination at which an acceleration of the relative movement between the workpiece (W) and the tool (T) ends during the cutting step, and a termination at which a deceleration of the relative movement between the workpiece (W) and the tool (T) starts during the retraction step, based on a distance between one cutting position and the subsequent cutting position in the second direction.

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