On-line Measurement and Compensation System for Geometric/Thermal Errors of CNC Machine Tools

Abstract

The invention provides an on-line measurement and compensation system for the geometric / thermal error of a numerical control machine tool, belonging to the technical field of error testing and compensation of a numerical control machine tool. The online measurement and compensation system for geometric / thermal error of CNC machine tools includes two parts: hardware platform and measurement and compensation software. The hardware platform includes a unidirectional acceleration sensor, a digital IC type high-precision temperature sensor, a multi-channel temperature data collector, and a geometric / thermal error measurement and compensation host. The measurement and compensation software runs in the geometric / thermal error measurement and compensation host to realize the test and compensation of the geometric and thermal errors of the machine tool, as well as communicate with the FANUC CNC system. The invention has the advantages of realizing fast and efficient testing of geometric errors through the acceleration sensor without requiring expensive professional instruments, and can simultaneously perform online real-time compensation for geometric and thermal errors.

Description

technical field [0001] The invention belongs to the technical field of error testing and compensation of numerical control machine tools, and specifically relates to an online measurement and compensation system for geometric / thermal errors of numerical control machine tools. Background technique [0002] The comprehensive errors of CNC machine tools mainly include geometric errors, thermal errors, control errors and force errors. Among them, geometric error and thermal error have the greatest impact on the machine tool. Geometric errors not only affect positional accuracy, but also curve trajectory accuracy. Thermal errors not only affect positional accuracy, but also affect the stability of the accuracy. In order to reduce the influence of geometric errors and thermal errors on the machining accuracy of machine tools, measures such as improving the accuracy of machine tool parts and assembly, fully closed-loop control and timing cooling are generally taken. Although the...

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Problems solved by technology

[0005] (1) At present, professional precision instruments such as laser interferometers and laser trackers are required for geometric error testing, and the disadvantages are complicated operation and high cost;

[0006] (2) Since the measuring instrument can only perform offline measurement, when the geometric accuracy changes, on-machine measurement and compensation cannot be realized

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