Drilling control apparatus

Abstract

In a drilling control apparatus for properly controlling a load sitting on a drill, a cutting reaction force estimate unit (1) estimates a disturbance load torque Yz acting on a servomotor (feed axis) (63) based on a speed signal X1z to the servomotor (63) and a torque value U1z commanded to the servomotor (63). In drilling operations, the cutting reaction force Yz is equivalent to a cutting reaction force generated between a drill (75) and a workpiece (91). Note, rotation of the drill (75) is controlled by a spindle motor (73) and a position in a Z-axis direction of the drill (75) and a feed speed of the drill (75) are controlled by the servomotor (63) through a spindle head (74). A cutting reaction force monitor unit (2) monitors whether a cutting reaction force estimated by the cutting reaction force estimate unit (1) follows a predetermined pattern, and if not, then a feed axis torque control unit (3) controls a torque of the servomotor (63) to cause the cutting reaction force to follow the predetermined pattern. The cutting reaction force generated between the drill (75) and the workpiece (91) is changed according to the predetermined pattern by a torque control of the feed axis.

Dependencies are inferred from the claim text.