A fast optimization method for geometric error compensation data of translation axis of five-axis CNC machine tool

Abstract

The invention discloses a method for quickly optimizing geometric error compensation data of a translational axis of a five-axis numerically controlled machine tool, comprising the following steps: 1) establishing a spatial positioning error model; 2) establishing an error database; 3) constructing a spatial error compensation table; 4) establishing Compensation data optimization model, forming an optimization model of three face diagonal lines and one body diagonal line under the translational axis linkage mode; 5) Complete the iterative optimization and selection of correction coefficients; 6) Complete the five-axis numerical control with step (5) Compensation of machine tool geometric errors; 7) Iterate error correction data to the geometric error database, set linkage trajectory detection, preset positioning error threshold, cycle steps 2 to 6, and realize the machine tool accuracy guarantee mode of periodic detection, optimization and compensation. The invention can reduce the detection times of the geometric error of the translational axis based on the laser interferometer by more than half, has better operability, can complete optimized compensation depending on the existing compensation value, and has high compensation quality.

Description

technical field [0001] The invention relates to the field of error optimization of a five-axis numerical control machine tool, in particular to a rapid optimization method for geometric error compensation data of a translational axis of a five-axis numerical control machine tool. Background technique [0002] Five-axis CNC machine tools are widely used in aerospace, automobile ships, medical equipment and other fields, which has greatly improved the strength of my country's basic manufacturing equipment. The machining accuracy of five-axis CNC machine tools is the key to ensuring the quality of the processed parts. Among the many error sources that affect the machining accuracy, the geometric error of the machine tool accounts for more than 50%, which has become an important part that restricts the improvement of machining accuracy. [0003] At present, the research on the geometric error of five-axis CNC machine tools is mainly divided into two aspects: the identification a...

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Problems solved by technology

In terms of research on the geometric error of the translational axis, both patent 201610055356 and patent 201910193297 have completed the identification of the geometric error of the translational axis using laser interferometers, and directly compensated the geometric error of the translational axis on the basis of the identification of geometric errors, but the compensation The effect is often unsatisfactory. The main reason is that the machining process of the machine tool is affected by complex and multi-factor dynamics, and the identification process introduces a certain random error of the equipment, resulting in a large deviation between the identified error value and the actual required compensation value.

In practical engineering applications, people with rich technical experience are often required to repeatedly correct and experiment the compensation value by judging the curve of the compensation data. This process has a high degree of manual participation, resulting in a low degree of automation of the compensation technology, which affects the entire production task. Cycle time and execution efficiency

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