Machine tool precision detection device and method under loading state

Abstract

The invention provides a machine tool precision detection device and method under a loading state. The system comprises a machine tool spindle, a machine tool spindle connection frame, a measurement device, a base connection frame and a base, wherein the machine tool spindle connection frame connects the machine tool spindle and one end of the measurement device; and the base connection frame connects the base and the other end of the measurement device. During the measurement, the base is mounted on a machine tool table. The rotation center of the base connection frame is rotated relative tothe rotation center of the machine tool spindle connection frame at a certain distance. At the same time, a piezoelectric actuator on the measurement device generates a load of a certain frequency between the machine tool spindle and the machine tool table, and an LVDT displacement sensor is used to measure the relative displacement of the machine tool spindle and the machine tool table, so as toachieve the measurement of the multi-degree-of-freedom spatial motion accuracy of the machine tool.

Description

technical field [0001] The invention belongs to the field of machine tool inspection, and relates to the measurement of the dynamic geometric accuracy of machine tools, in particular to a detection device and method for the accuracy of machine tools in a loaded state. Background technique [0002] With the continuous development of modern manufacturing industry, higher and higher requirements are put forward for the machining accuracy of CNC machine tools, and the detection methods are also constantly updated. The machining accuracy detection of machine tools mainly focuses on the geometric accuracy detection of machine tools. Now the commonly used methods include laser interferometer positioning accuracy detection, ballbar dynamic accuracy detection, etc. [0003] Using the inverse piezoelectric effect of piezoelectric materials, the voltage control signal applied at both ends of piezoelectric ceramics is converted into the output of mechanical deformation displacement and ...

AI Technical Summary

Problems solved by technology

There are two types of control methods for piezoelectric stacks: open-loop and closed-loop. The closed-loop type is equipped with a sensor that provides a feedback signal on the piezoelectric stack, which has higher displacement accuracy, but at the same time will result in slower dynamic response.

Images