A method for evaluating dynamic error transfer characteristics of parallel-connected spindle heads

Abstract

The invention discloses an evaluation method for dynamic error transmission characteristics of a parallel spindle head and belongs to the technical field of machine tools. According to the method, first, a transmission relation between following errors of all driving shafts of the parallel spindle head and motion errors of a terminal mobile platform is derived; a transmission relation between the following errors of all the driving shafts and positional deviation of a tool nose tip is established based on the positional deviation of the tool nose tip of the parallel spindle head, and a non-dimensional square matrix representing the dynamic error transmission characteristics of the parallel spindle head is obtained; and non-dimensional error transmission indicators are proposed based on the non-dimensional square matrix, wherein the error transmission indicators represent the weakness of the influence of the following errors of all the driving shafts on the positional deviation of the tool nose tip. Through the method, the problem that the physical significance of a traditional evaluation method for dynamic error transmission characteristics is not clear is solved, and by proposing the non-dimensional error transmission indicators, the dynamic error transmission characteristics of the parallel spindle head can be evaluated more effectively.

Description

technical field [0001] The invention belongs to the technical field of machine tools, and in particular relates to the evaluation problem of the dynamic error transmission characteristic of a parallel configuration spindle head. Background technique [0002] Motion accuracy is the most important index of the parallel configuration spindle head for industrial processing. Compared with the traditional serial configuration spindle head, the parallel configuration spindle head has higher motion accuracy in theory because there is no error accumulation, so many parallel configuration spindle head schemes have been proposed one after another, but most of the parallel configuration spindle heads In practice, the dynamic accuracy is too low to meet the processing requirements. Therefore, it is necessary to carry out more in-depth research on the accuracy of the parallel configuration spindle head. Among them, the evaluation of the dynamic error transfer characteristics of the paral...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the existing evaluation methods, and propose a method for evaluating the dynamic error transfer characteristics of the parallel configuration spindle head, which is used to solve the evaluation problem of the dynamic error transfer characteristics of the parallel configuration spindle head, thereby More accurate evaluation of the influence of the following error of each drive axis of the parallel configuration spindle head on the position deviation of the tool nose point

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