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Three-axis numerical control machine tool key geometric error identification method based on global sensitivity analysis

A technique of sensitivity analysis and geometric error, applied in the direction of program control, computer control, general control system, etc., can solve problems such as ignoring the interaction effect

Active Publication Date: 2014-08-27
BEIJING UNIV OF TECH
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Problems solved by technology

Local sensitivity analysis is more operable for the change of a single factor, but it ignores the interaction between factors and the impact on the entire system when multiple factors interact

Method used

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  • Three-axis numerical control machine tool key geometric error identification method based on global sensitivity analysis
  • Three-axis numerical control machine tool key geometric error identification method based on global sensitivity analysis
  • Three-axis numerical control machine tool key geometric error identification method based on global sensitivity analysis

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Embodiment Construction

[0114] The present invention takes a three-axis precision vertical machining center as an example to verify the identification method of the key geometric error of the above-mentioned three-axis numerical control machine tool.

[0115] Specifically include the following steps:

[0116] Step 1: Set the generalized coordinate system for the three-axis machine tool, and establish the spatial error model of the machine tool.

[0117] Based on the kinematics theory of multi-body systems, low-order body arrays are used to describe the topology of abstract machine tool systems, a generalized coordinate system is established in multi-body systems, positional relationships are expressed by vectors and their column vectors, and multi-body systems are represented by homogeneous transformation matrices interrelationships;

[0118] Step 1.1 Establish the topology of the three-axis machine tool

[0119] The structure of the machine is as Figure 4 shown. The machine tool includes ram, c...

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Abstract

The invention provides a three-axis numerical control machine tool key geometric error identification method based on global sensitivity analysis, belongs to the field of machine tool accuracy design, and particularly relates to a three-axis machine tool space error modeling method and a three-axis machine tool geometric error global sensitivity analysis method. On the basis of machine tool space error models built through the multi-body theory and geometric error measurement, global sensitivity analysis is conducted on various geometric errors of a machine tool, and influence on machining accuracy of the coupling effect of the geometric errors is obtained. A new machine tool design concept is provided, and the problem of machine tool accuracy is fundamentally solved. Guiding suggestions can be put forward for practical assembly and machining, therefore, output of errors is reduced, the machining accuracy of the numerical control machine tool is improved, and the problem of the machine tool accuracy is fundamentally solved.

Description

technical field [0001] The invention relates to a key geometric error identification method of a three-axis machine tool, which belongs to the field of machine tool precision design. Background technique [0002] The machinery manufacturing industry, as the production of mechanical equipment, provides technical equipment for the entire national economy. Its development level is one of the main symbols of the country's industrialization level. With the rapid development of modern science and technology, precision ultra-precision processing technology has become a modern machinery manufacturing industry. major trends in development. CNC machine tool is a high-precision, high-efficiency, high-tech modern electromechanical equipment. As the basis and core equipment of advanced manufacturing technology, it is more and more widely used in mechanical production, and restricts the development of manufacturing fields and various high-tech develop. An important index to measure the ...

Claims

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Application Information

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IPC IPC(8): G05B19/401
Inventor 程强赵宏伟冯秋楠祁卓刘志峰
Owner BEIJING UNIV OF TECH
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