DRILLING SYSTEM

WIPO Patent Application WO/1995/002485

A1

A drilling system for properly controlling the load of a drill. A cutting reaction force estimating means (1) estimates a disturbance torque Yz acting on a servomotor (63) based on a speed signal x1z of the servomotor (feeding shaft) (63) and a torque command value U1z to the servomotor (63). In the case of drilling, this cutting reaction force Yz is equal to a cutting reaction force generated between a drill (75) and a work (91). The rotation of the drill (75) is controlled by a spindle motor (73), and the position and feeding speed of the drill (75) in a Z direction is controlled by the servomotor (63) via a spindle head (74). A cutting reaction force monitoring means (2) monitors if a cutting reaction force estimated by the cutting reaction force estimating means (1) follows up a predetermined pattern or not, and when it does not follow up the pattern, a feeding shaft torque control means (3) controls the torque of the servomotor (63) so as to make the cutting reaction force follow up the predetermined pattern. This torque control by the feeding shaft allows the cutting reaction force generated between the drill (75) and the work (91) to change so as to follow up the predetermined pattern.

FUJIMOTO AKIHIKO (JP)
NAGATOMI TAKASHI (JP)
SATO NAOKI (JP)

PCT/JP1994/000981

January 26, 1995

June 16, 1994

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FUJIMOTO AKIHIKO (JP)
NAGATOMI TAKASHI (JP)
SATO NAOKI (JP)

B23Q15/12; B23Q17/09; G05B19/18; B23B47/18; G05B19/404; G05B19/416; (IPC1-7): B23Q15/12; B23B47/18

JPH01281807A	1989-11-13
JPS6235752U	1987-03-03
JPS57138556A	1982-08-26
JPS5662748A	1981-05-28
JPS614615B2	1986-02-12
JPS5455879A	1979-05-04
JPS58177255U	1983-11-26
JPH02198745A	1990-08-07
JPS57138559A	1982-08-26
JPS54102681A	1979-08-13
JPS642625B1

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