Numerical control machine error identification and separation method based on processing workpiece curved surface morphology information

Abstract

The invention provides a numerical control machine error identification and separation method based on processing workpiece curved surface morphology information. By the aid of the method, workpiece curved surface morphology reverse engineering, morphology separating and cutter location point reverse engineering calculating technologies are adopted in the error separation method of the numerical control machine, error separation of the numerical control machine is realized, and meanwhile, effective analyze manners and application models are provided for researchers of numerical control machine error compensation to perform intense research of error compensation model optimization and compensation effectiveness. Machine processing state monitoring, workpiece theory mathematical model and theoretical cutter path information are combined with the numerical control machine error identification and separation method, pre-processing of error collecting data can be performed, the type of a fitting model can be determined and identified according to the autocorrelation function, the partial correlation function and trimmed property thereof, order determination of the model can be performed accurately, the error separation of the numerical control machine can be completed efficiently and accurately, and meanwhile, change situation of the machine can be accurately inferred and predicted according to the obtained mathematical model formulas, so that error compensation work of the machine can be more reliable and effective.

Description

technical field [0001] The invention belongs to the field of error separation of numerically controlled machine tools, and in particular relates to a machine tool error identification and separation method based on the shape information of the curved surface of a processed workpiece. Background technique [0002] At present, the "bottleneck" problem of domestic CNC machine tools entering the high-end field is mainly that the machining accuracy and reliability are difficult to reach the level of similar foreign products, and this involves many issues: 1. The processing of various assembly parts of high-end CNC machine tools The accuracy is difficult to guarantee due to the lack of more precise machine tools as the working machine; second, the design of the hardware structure of the machine tool in consideration of error compensation and the processing of error factors in the manufacturing process have not yet reached the same level as foreign machine tool manufacturers; The C...

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Problems solved by technology

[0002] At present, the "bottleneck" problem of domestic CNC machine tools entering the high-end field is mainly that the machining accuracy and reliability are difficult to reach the level of similar foreign products, and this involves many issues: 1. The processing of various assembly parts of high-end CNC machine tools The accuracy is difficult to guarantee due to the lack of more precise machine tools as the working machine; second, the design of the hardware structure of the machine tool in consideration of error compensation and the processing of error factors in the manufacturing process have not yet reached the same level as foreign machine tool manufacturers; The CNC system does not yet have the machine tool error separation technology, and the related research is still in the laboratory stage, and has not been implemented in actual production

However, for the various errors of the machine tool that have not been separated, the usual error compensation method cannot be estimated, and it is impossible to make corresponding compensation for the error in real time during the machining process of the machine tool.

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