Control device for machine tool

• US 8,026,689 B2
• Filed: 04/15/2010
• Issued: 09/27/2011
• Est. Priority Date: 04/17/2009
• Status: Active Grant

• Current Assignee: Fanuc Ltd (Fanuc Corporation)
• Original Assignee: Fanuc Ltd (Fanuc Corporation)
• Inventors: Tezuka, Junichi, Okita, Tadashi, Iwashita, Yasusuke
• Primary Examiner(s): Ip; Paul
• Application Number:
  US12/761,191
• Publication Number:
  US 20100264867A1
• Time in Patent Office: 530 Days
• Field of Search: 318/565, 318/635, 318/571, 318/572, 318/561, 700/188, 700/159, 702/865.9, 451/28, 738/659
• US Class Current: 318/635
• CPC Class Codes: G05B 19/416 characterised by control of velocity, acceleration or deceleration G05B19/19 takes precedence
• CPC Class Codes: G05B 2219/34314 Slow down, limit speed for energy saving

Abstract

A control device for a machine tool including a feed axis driving motor; a first power consumption calculating portion calculating power consumption of the feed axis driving motor; a second power consumption calculating portion calculating power consumption of equipment adapted to be operated by constant power; and a motor control portion determining a target time constant correlated with at least one of acceleration time and deceleration time of the feed axis driving motor, based on a summation of the power consumption calculated by the first power consumption calculating portion and the power consumption calculated by the second power consumption calculating portion, and controlling the feed axis driving motor based on the target time constant.

Claims

1. A control device of a machine tool, comprising:

a feed axis driving motor;

a spindle driving motor;

a first power consumption calculating portion calculating power consumption of the feed axis driving motor or the spindle driving motor, using a time constant correlated with at least one of acceleration time and deceleration time of the feed axis driving motor or the spindle driving motor as a parameter;

a cycle time calculating portion calculating a cycle time for machining a workpiece, the cycle time varying according to the time constant;

a second power consumption calculating portion calculating power consumption of equipment provided at the machine tool and adapted to be operated by a constant power, based on the cycle time calculated by the cycle time calculating portion; and

a motor control portion determining a target time constant based on a summation of the power consumption calculated by the first power consumption calculating portion and the power consumption calculated by the second power consumption calculating portion, and controlling the feed axis driving motor or the spindle driving motor based on the target time constant.

2. The control device of claim 1, wherein the motor control portion controls at least one of acceleration and deceleration of the feed axis driving motor or the spindle driving motor so that the summation of the power consumption calculated by the first power consumption calculating portion and the power consumption calculated by the second power consumption calculating portion is a minimum value when the workpiece is machined by operating the equipment operated by the constant power and driving the feed axis driving motor or the spindle driving motor.

3. The control device of claim 1, wherein the motor control portion controls at least one of acceleration and deceleration of the feed axis driving motor or the spindle driving motor so that the cycle time calculated by the cycle time calculating portion is a minimum value in a range in which the summation of the power consumption calculated by the first power consumption calculating portion and the power consumption calculated by the second power consumption calculating portion is equal to or less than a preset value when the workpiece is machined by operating the equipment operated by the constant power and driving the feed axis driving motor or the spindle driving motor.