Geometry/thermal error online measuring and compensating system for numerical control machine tool

Abstract

The invention provides a geometry / thermal error online measuring and compensating system for a numerical control machine tool, and belongs to the technical field of error testing and compensating of the numerical control machine tool. The geometry / thermal error online measuring and compensating system for the numerical control machine tool comprises a hardware platform and measuring and compensating software. The hardware platform comprises a one-way acceleration sensor, a digital IC-type high-precision temperature sensor, a multi-channel temperature data collector and a geometry / thermal errormeasuring and compensating host. The measuring and compensating software operates in the geometry / thermal error measuring and compensating host to achieve geometry / thermal error measuring and compensating of the machine tool and is in communication with an FANUC numerical control system. The system has the advantages that rapid and efficient testing of geometry errors is achieved through the acceleration sensor, an expensive special instrument is not needed, and geometry and thermal errors can be subjected to online real-time compensation at the same time.

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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