摘要:
A tool damage prevention system is provided which can easily detect an abnormal load with high accuracy to reliably prevent damage to a tool, and which also can appropriately cope with abnormality even if tool damage or the like has already occurred. A first disturbance torque estimating device estimates a disturbance torque Ys acting on a spindle motor, based on a velocity signal X1s from the spindle motor (spindle) and a torque command value U1s for the spindle motor. A second disturbance torque estimating device estimates a disturbance torque Yz acting on a servomotor, based on a velocity signal X1z from the servomotor (feed shaft) and a torque command value U1z for the servomotor. A comparing device obtains a composite disturbance torque Y by combining the estimated disturbance torques Ys and Yz, and compares the composite disturbance torque Y with a preset reference torque Ye. A deceleration/stop command device outputs a command signal to decelerate or stop the tool feed or to change the tool in accordance with the result of the comparison.
摘要:
A feed-shaft moving method and an apparatus capable of reducing non-cutting motion time. In a first section and a second section, an immediately preceding path is connected with a rapid traverse by a rapid traverse motion path having a curve continuous with the immediately preceding path. The movement is accelerated up to a rapid traverse speed while passing the curve. In the first section, the path is connected with the next path by a rapid traverse path having a curve continuous with the next movement. The movement is decelerated to the next moving speed while passing the curve. The rapid traverse motion of the feed shaft can be completed in less time, with unnecessary interruption and with no impact on the machine.
摘要:
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.
摘要:
In a tool exchange system, in which the selection of a tool (8) supported on a magazine (9) is done by the rotation of a main spindle (5) via a pair of gears (20) and (21), an elastic member (71) is provided so as to retain the magazine (9) in a machining position (pause position) which does not interfere with a machining operation. A first cam mechanism (11) is adapted to move the magazine (9) between a tool exchange position and the machining position in response to the vertical move of a Z-slider (3) moving along a column (1). A second cam mechanism (12) is adapted to operate a tool attachment/removal means (6).
摘要:
A cutter fracture detecting system is capable of detecting a fracture of a cutter highly accurately which may occur even when no substantial loads are imposed on a rotating axis and a cutter feed axis of a machine tool. A rotating axis disturbant load torque estimating unit (1) and a moving axis disturbant load torque estimating unit (2) monitor disturbant load torques on a spindle and an axis with respect to which a workpiece and a cutter move relatively to each other, and still axis disturbant load torque estimating units (3, 4) also monitor disturbant load torques on axes with respect to which the workpiece and the cutter do not move relatively to each other. A comparing unit (5) determines that the cutter is fractured based on the disturbant load torques estimated by the disturbant load torque estimating units. When a cutter fracture is detected, the machine tool is stopped by a machine shutdown command unit (6).