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Geometric error modeling method for numerically-controlled machine tool

A numerical control machine tool, geometric error technology, applied in the direction of simulator, program control, computer control, etc., can solve problems such as the influence of tool accuracy, and achieve the effect of being beneficial to machine tool error compensation, clear geometric meaning, and beneficial to machine tool design

Inactive Publication Date: 2017-03-15
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a numerical control machine tool geometric error modeling method, which can effectively solve the problem of the influence of the geometric error of each motion axis on the accuracy of the tool

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  • Geometric error modeling method for numerically-controlled machine tool
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  • Geometric error modeling method for numerically-controlled machine tool

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Embodiment Construction

[0054] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0055] attached figure 1 Shown is the flow chart of the numerical control machine tool geometric error modeling method based on the coordinate system differential motion transformation relationship of the present invention, with figure 2 Shown is a schematic structural diagram of a CNC machine tool, and the method of the present invention is illustrated by taking the machine tool as an example.

[0056] Step 1. Establish the topological structure of the CNC machine tool and the open-loop kinematic chain from the workbench to the tool according to the structure and type of the CNC machine tool: the machine tool is a CAFYXZ five-axis CNC machine tool, and the topology structure is established. The open-loop kinematic chain is from the workbench → C Axis → A axis → bed → Y axis → X axis → Z axis → tool, as attached image 3 indicated by the mid...

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Abstract

The invention, which belongs to the technical field of the numerically-controlled machine tool processing, discloses a geometric error modeling method for a numerically-controlled machine tool. The method comprises the following steps that: a machine tool topological structure and an opened-loop kinematic chain are established according to a machine tool structure and type; on the basis of differential kinematic conversion relation between different rectangular coordinate systems, a conversion relationship between a differential kinematic matrix and a homogeneous transform matrix between the coordinate systems is established; homogeneous transform matrixes of the machine tool relative to all motion shafts are established successively; differential kinematic matrixes of all motion shafts relative to a cutting tool are established; six-dimensional geometric error vectors of all motion shafts are established; influences on the cutting tool precision by the geometric errors of all motion shafts are calculated; adding is carried out to obtain a comprehensive error vector of the cutting tool; and according to the homogeneous transform matrix of the cutting tool relative to a work bench, the comprehensive error vector of the cutting tool is converted into a comprehensive error matrix of the machine tool, thereby obtaining position errors and attitude errors of the machine tool and the cutting tool. Therefore, the method is mainly used for obtaining influences on the machine tool precision by all motion shaft errors, so that the processing precision is improved.

Description

technical field [0001] The invention relates to the technical field of numerically controlled machine tool processing, in particular to the geometric error modeling technology of numerically controlled machine tools. Background technique [0002] With the rapid development of the manufacturing industry, the complexity and precision requirements of the workpiece surface are getting higher and higher, so the requirements for the precision of CNC machine tools are also increasing. Factors that affect the accuracy of machine tools include geometric errors, thermal errors, and deformation errors and servo errors caused by cutting forces. Among them, geometric errors account for a large proportion of all error sources. In addition, due to the high repeatability, stability and measurability of geometric errors, geometric error modeling and compensation are one of the main means to improve the accuracy of CNC machine tools. [0003] Geometric error modeling is the basis for error c...

Claims

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Application Information

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IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/32352
Inventor 付国强高宏力宋兴国曹中清
Owner SOUTHWEST JIAOTONG UNIV
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