Influence analytical method for identifying load error of static-pressure rotary table and analyzing influence of load error on machining error of machine tool

Abstract

The invention provides an influence analytical method for identifying the load error of a static-pressure rotary table and analyzing the influence of the load error on the machining error of a machine tool, and belongs to the accurate design field of numerical control machine tools. On the premise that the load error of a machine tool is taken into account, an N-S equation and a film hypothesis theory are adopted to derive the table-board load error recognition of the static-pressure rotary table. Based on error measurement data, a space error model of the entire machine tool is established based on the topological structure of the machine tool in the index matrix form of the screw theory. The above method comprehensively considers load parameters and is reliable and efficient in calculation. The accuracy model of the machine tool is established based on the index matrix of the screw theory, so that the influence effect of each load error can be accurately calculated through quantitatively considering a fluid dynamics equation. That means, the above method is capable of not only simultaneously detecting the combined effect of the variation of multiple load parameters on the result of the error model, but also analyzing the individual effect of the variation of each load parameter on the result of the error model. The results of actual cases show that, the above method is effective.

Description

technical field [0001] The invention provides a load error identification method of a static pressure turntable and an analysis method for its influence on machine tool processing errors, belonging to the field of precision design of numerical control machine tools. Background technique [0002] The heavy-duty gantry milling machine is an irreplaceable important processing equipment for efficient and high-quality processing of large, special-shaped and complex parts. As the key bearing part of the heavy-duty machine tool, the hydrostatic turntable is directly related to the processing capacity and precision level of the machine tool. The processing objects faced by the heavy-duty gantry milling machine have the characteristics of large-scale and heavy-duty. When the static pressure turntable is loaded during operation, a load error will occur, which makes the actual trajectory of the turning-milling CNC machine tool not completely consistent with the theoretical trajectory, w...

AI Technical Summary

Problems solved by technology

Comprehensively analyzing the work done by predecessors, it is considered that the establishment process of the machine tool accuracy model considering geometric transmission error, thermal error and other error items is relatively mature. However, the research on load error, especially in the static This area of ​​pressure turntable load error is still an issue to be further studied

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