Precision reliability analysis method for heavy numerical control machine tool

Abstract

The invention belongs to the field of reliabilities of numerical control machine tools, and particularly relates to a precision reliability analysis method for a heavy numerical control machine tool based on a multi-body system kinemics theory. The precision reliability analysis method comprises the following steps: constructing a relation model between the output precision error of the heavy numerical control machine tool and a factor affecting the precision of the machine tool, fitting a change relation of the factor affecting the precision of the machine tool along with the time by a random process, finally combining on-site data or data of the same type of sample, and introducing a Bayes evaluation method to update the precision error model of the heavy numerical control machine tool, thus realizing evaluation of the precision reliability of the machine tool. The precision reliability analysis method has the beneficial effects that the Bayes evaluation method is introduced to fit and correct the change tendency of respective factors causing a motion precision error of the machine tool, so that the difficulty that a sufficient statistical sample cannot be formed due to a 'small sample' is solved; and therefore, more scientific and reasonable evaluation is performed on the dynamic reliability of the precision error of the heavy numerical control machine tool.

Description

technical field [0001] The invention belongs to the field of reliability of numerical control machine tools, and in particular relates to a precision reliability analysis method of heavy numerical control machine tools based on multi-body system kinematics theory. Background technique [0002] With the continuous development of modern industry, CNC machine tools have undergone many updates, and their performance and technical level are developing rapidly. Especially in recent years, with the development of information technology, electronic technology, mechanical technology and other related disciplines, many performance indicators such as speed, precision and number of control axes of CNC machine tools have been improved. However, the reliability of machine tools has become a problem that plagues CNC equipment. One of the main problems of development. [0003] The development level of heavy-duty CNC machine tools can often reflect the industrial development level of a coun...

AI Technical Summary

Problems solved by technology

The accuracy and reliability of heavy-duty CNC machine tools decline, resulting in huge losses caused by processed products that do not meet the specifications. Therefore, it is of great significance to establish a more reasonable precision error model of heavy-duty CNC machine tools to scientifically predict the accuracy and reliability of heavy-duty CNC machine tools when they are working. Very important engineering significance

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