METHOD AND DEVICE FOR CORRECTING THERMAL DISPLACEMENT FOR MACHINE TOOL

• Main Author: SAKURABA HAJIME
• Format: Patent
• Language: English
• Published: 09.07.1996
• Edition: 6
• Subjects: COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MACHINE TOOLS; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PERFORMING OPERATIONS; PHYSICS; 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; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; TRANSPORTING

PURPOSE: To perform correction of thermal displacement with high precision by a method wherein the temperature change of a machine body is detected, and a temperature change having approximately the same time constant as that of thermal displacement of a machine tool is computed. CONSTITUTION: Output signals from temperature sensors S1 and S2 are inputted to the A/D converter 13 of a thermal displacement correction device 12 through circuits 36 and 37 and inputted analogue signals are converted thereat into respective digitals signals. The digital signal from the A/D converter 13 is inputted to a computing memory part 14, wherein thermal displacement is computed. Based on the computed thermal displacement, a machining error is corrected by a correction means 33. An output signal from the correction means 33 is transmitted to a numerical control device 16 through a programmable controller 15 and feedback of it to a servo system is effected to correct a position.