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Processing error model global sensitivity analysis method based on quasi-Monte Carlo simulation

A quasi-Monte Carlo and sensitivity analysis technology, applied in the field of machine tool precision design, can solve problems such as complex structure of five-axis machine tools, many error factors involved, and complex processing and forming mechanisms

Active Publication Date: 2019-09-27
BEIJING UNIV OF TECH
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Problems solved by technology

The structure of the five-axis machine tool is complex, involving more error factors, and the processing and forming mechanism is also more complicated than that of the three-axis machine tool

Method used

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  • Processing error model global sensitivity analysis method based on quasi-Monte Carlo simulation
  • Processing error model global sensitivity analysis method based on quasi-Monte Carlo simulation
  • Processing error model global sensitivity analysis method based on quasi-Monte Carlo simulation

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Embodiment Construction

[0138] The present invention takes a five-axis elevated beam mobile gantry CNC milling machine as an example to verify the identification method of the key geometric errors of the five-axis CNC milling machine.

[0139] Specifically include the following steps:

[0140] Step 1: Take the five-axis CNC machine tool as an example to establish the spatial error model of the machine tool;

[0141] Based on the theory of multi-body system kinematics, the structure of the machine tool and the relationship between each body are described by topological structure diagram and low-order body array table, such as image 3 and shown in Table 1. Analyze the geometric error of CNC machine tools, establish a generalized coordinate system, use the characteristic matrix between adjacent bodies to express the positional relationship, and use the homogeneous transformation matrix to express the relationship between multi-body systems;

[0142] Step 1.1 establishes the topology of the five-axis ...

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Abstract

The invention discloses a novel processing error model global sensitivity analysis method based on quasi-Monte Carlo simulation, belongs to the field of machine tool precision design, and particularly relates to a spatial error modeling method of a multi-axis numerical control machine tool and the processing error model global sensitivity analysis method based on quasi-Monte Carlo simulation. According to the present invention, a multi-body system theory is used for establishing a numerical control machine tool space error model, according to the Monte Carlo sampling mechanism, a machine tool machining error model is subjected to the global sensitivity analysis, the key geometric error parameters influencing a machine tool machining error are obtained, a new machine tool design concept is provided at the initial stage of the machine tool design, and a theoretical basis is laid for improving the machining precision of the numerical control machine tool and compensating the key geometric error parameters.

Description

technical field [0001] The invention relates to a global sensitivity analysis method of a machining error model based on pseudo-Monte Carlo simulation, and belongs to the technical field of machine tool precision design. Background technique [0002] In recent years, as the industrial master machine of the manufacturing industry, the function of CNC machine tools has been continuously improved. In order to meet the requirements of precision machining of increasingly complex workpieces, five-axis machine tools have been more and more widely used. The structure of the five-axis machine tool is complex, involving more error factors, and the processing and forming mechanism is more complicated than that of the three-axis machine tool. Compared with three-axis machine tools, five-axis machine tools have the advantages of better versatility and flexibility, higher efficiency and precision. Due to the continuous maturity of various technologies of five-axis CNC machine tools, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06F17/16
CPCG06F17/16G06F30/17
Inventor 范晋伟陶浩浩
Owner BEIJING UNIV OF TECH
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