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STL file-based precision machine tool computer-aided tolerance analysis method

A computer-aided precision machine tool technology, which is applied in the field of precision machine tool tolerance analysis and error state optimal estimation, can solve problems such as insufficient precision and excessive precision, and achieve the effect of reducing workload and improving work efficiency

Inactive Publication Date: 2018-11-06
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a computer-aided tolerance analysis method for precision machine tools based on STL files in order to solve the problems of relying on the experience of engineers and the lack of precision and excess precision in the tolerance analysis of existing machine tools

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  • STL file-based precision machine tool computer-aided tolerance analysis method
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  • STL file-based precision machine tool computer-aided tolerance analysis method

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Embodiment Construction

[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0049] Aiming at the problems of relying on engineer experience and insufficient precision and excess precision in the existing machine tool tolerance analysis process, the present invention invents a precision machine tool tolerance analysis method considering measurement and adjustment process, and the method includes a state space model of the machine tool assembly process.

[0050] The process flow of the precision machine tool computer-aided tolerance analysis method based on the STL file provided by the present invention is as follows: figure 1As shown, methods such as generating error transfer chains and establishing state space equations are included. According to the tolerance analysis steps shown in the flow chart, the accuracy prediction of the machine tool can be realized. The specific steps are:

[0051] 1) For a precision machin...

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Abstract

The invention discloses an STL file-based precision machine tool computer-aided tolerance analysis method. The method comprises the following steps of: 1) extracting a vertex coordinate value in an STL file of a precision machine tool in any cascaded structure, judging coincident surfaces to obtain a relative position relationship and a connection relationship among basic major parts of the precision machine tool and a normal vector of a key feature surface, and setting an assembling sequence; 2) establishing a coordinate system on the key feature surface, and generating an error propagation chain so as to realize mathematic description of error propagation and accumulation in the assembling process; and 3) predicting geometric precision after the whole precision machine tool is assembledby combining the error propagation chain and considering part machining errors in the practical production process and measurement and adjustment links in the practical assembling process. Aiming at precision machine tool tolerance analysis problems, the method is capable of researching the error propagation and accumulation in the machine tool assembling process, and comprehensively considering the measurement and adjustment links in the practical assembling process for the whole precision after the assembling, so that the engineers can be effectively helped to carry out precision prediction.

Description

technical field [0001] The invention belongs to the technical field of precision machine tool tolerance analysis and error state optimal estimation, and specifically relates to a precision machine tool computer-aided tolerance analysis method based on STL files. Background technique [0002] The STL file format is very simple and widely used. It is the most common file format supported by computer graphics processing, digital geometry processing, and digital geometry industrial applications. Machine tool precision performance is the basic index of machine tool design, which is comprehensively guaranteed through design, manufacturing and assembly. However, the existing machine tool tolerance analysis methods rely heavily on the experience of engineers, and have the problem of insufficient or excessive accuracy. Contents of the invention [0003] The purpose of the present invention is to provide a computer-aided tolerance analysis method for precision machine tools based o...

Claims

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Application Information

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IPC IPC(8): G06F17/11G06F17/16
CPCG06F17/11G06F17/16
Inventor 郭俊康洪军刘奕颖刘志刚王江威刘鹏
Owner XI AN JIAOTONG UNIV
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