Method of controlling drive of driving motor for rotary indexing device of machine tool

• Main Authors: YONENAGA TAKESHI, OSAKI HARUO
• Format: Patent
• Language: English
• Published: 22.12.2009
• Subjects: BORING; CALCULATING; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT; COMPUTING; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; COUNTING; DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING; DYNAMO-ELECTRIC MACHINES; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; HAND TOOLS; MACHINE TOOLS; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS; MANIPULATORS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PERFORMING OPERATIONS; PHYSICS; PORTABLE POWER-DRIVEN TOOLS; REGULATING; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FORFASTENING, CONNECTING, DISENGAGING OR HOLDING; TRANSPORTING; TURNING

A method of controlling drive of a driving motor for a rotary indexing device is provided. The device includes an indexing mechanism that indexes an angular position of a circular table by rotating the circular table with the use of the driving motor as a driving source, a clamping mechanism that holds the indexed angular position, and a control unit that controls drive of the driving motor by position control. In the method, the control unit controls the drive of the driving motor during operation of the clamping mechanism with a content of control in which an output torque of the driving motor by the position control becomes smaller than an output torque by the position control during indexing of the angular position of the circular table for an equivalent positional deviation.