Temperature compensation system and compensation method used for large-size numerical control machine

Abstract

The invention discloses a temperature compensation system and a compensation method used for a large-size numerical control machine. The large-size numerical control machine comprises a machine tool, a servo motor and a driver for driving the servo motor; the system comprises a plurality of temperature sensors arranged on the machine tool and a transducer, a PLC module and a shaft module which are connected with the temperature sensors in sequence, wherein one end of the shaft module is connected with a numerical control unit for carrying out temperature compensation, and the other end thereof is connected with the driver. The compensation method comprises the following steps of acquiring, calculating temperature compensation values, revising and outputting. In the invention, the actual temperature curve of each position of the machine tool is acquired by the temperature sensors, and the compensation amount is output to the driver by temperature compensation to drive the servo motor to carry out position compensation, thereby overcoming the disadvantage that numerical control machines used in the common workshop environment are easy to generate errors and increasing the processing accuracy and positioning accuracy.

Description

technical field [0001] The invention relates to a temperature compensation system and a compensation method, in particular to a temperature compensation system and a compensation method for large numerically controlled machine tools. technical background [0002] Metal materials have the property of "expanding with heat and contracting with cold", which is usually described by the coefficient of thermal expansion in physics. At present, the basic parts of guide rails such as the bed, column, and carriage of CNC machine tools, and the transmission components such as ball screws are all made of metal materials. An additional error will be generated on the position of the movement axis of the machine tool, which will directly affect the positioning accuracy of the machine tool, thereby affecting the machining accuracy of the workpiece. [0003] For CNC machine tools used under ordinary workshop environmental conditions, especially large-scale machine tools with relatively long...

AI Technical Summary

Problems solved by technology

At present, the basic parts of guide rails such as the bed, column, and carriage of CNC machine tools, and the transmission components such as ball screws are all made of metal materials. Additional errors will be generated on the position of the movement axis of the machine tool, which will directly affect the positioning accuracy of the machine tool, thereby affecting the machining accuracy of the workpiece

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