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Method for designing geometric accuracy of multi-axis numerical control machine tool to improve processing accuracy and reliability

A technology of machining precision and CNC machine tools, which is applied in computing, electrical digital data processing, special data processing applications, etc., and can solve problems such as rare reliability design of machining accuracy

Inactive Publication Date: 2014-11-19
BEIJING UNIV OF TECH
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Problems solved by technology

Reliability design has been rapidly developed and widely used in mechanism design, automobile industry, aerospace and other fields. Reliability design based on response surface model, reliability design based on tolerance model, and engineering ( Stochastic) model reliability design, reliability design based on cost-quality model, and reliability design methods such as minimum sensitivity method, but a small number of studies have applied reliability design methods to mechanical design, especially the machining accuracy reliability of machine tools design is extremely rare

Method used

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  • Method for designing geometric accuracy of multi-axis numerical control machine tool to improve processing accuracy and reliability
  • Method for designing geometric accuracy of multi-axis numerical control machine tool to improve processing accuracy and reliability
  • Method for designing geometric accuracy of multi-axis numerical control machine tool to improve processing accuracy and reliability

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Embodiment Construction

[0106] The present invention takes the XKH1600 five-axis machining center as an example to verify the geometric error distribution method of the above-mentioned multi-axis numerical control machine tool.

[0107] Specifically include the following steps:

[0108] Step 1: Set up the generalized coordinate system for the five-axis machine tool, and establish the spatial error model of the machine tool.

[0109] 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;

[0110] Step 1.1 Establish the topology of the five-axis machine tool

[0111] The structure of the machine is as figure 1 shown. The machine tool includes rams, cutting tools, workpiec...

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Abstract

The invention belongs to the field of machine tool accuracy designing, and relates to a method for designing geometric accuracy of a multi-axis numerical control machine tool to improve processing accuracy reliability, in particular to a modeling method of space errors of the multi-axis numerical control machine tool and an analyzing method of processing accuracy reliability and reliability sensitivity of the machine tool. A space error model of the multi-axis numerical control machine tool and a processing accuracy reliability model as well as a processing accuracy sensitivity model of the multi-axis numerical control machine tool under a multi-failure mode are built, geometric error items high in processing accuracy reliability sensitivity are optimized, processing accuracy reliability of the machine tool is improved, a basis is provided for acquiring interrelation among geometric errors of the multi-axis numerical control machine tool and setting accuracy grade of main transmission components of the machine tool, and the problem of accuracy distribution of the machine tool is solved fundamentally.

Description

technical field [0001] The invention relates to a geometric precision design method of a multi-axis numerical control machine tool, in particular to a geometric precision design method of a multi-axis numerical control machine tool for improving the reliability of machining accuracy, and belongs to the field of machining precision design of machine tools. Background technique [0002] As the basic equipment of advanced manufacturing technology, CNC machine tools have a direct impact on the development of my country's automobile, aerospace, weaponry and other important industries. The advantages and disadvantages of performance in the design and use of CNC machine tools are mainly reflected in the accuracy of CNC machine tools, and the accuracy indicators of CNC machine tools mainly include machining accuracy, positioning accuracy and repeat positioning accuracy. Among them, machining accuracy is the ultimate precision pursued by CNC machine tools. It is a very important inde...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 蔡力钢章子玲程强刘志峰秦德霖冯秋男
Owner BEIJING UNIV OF TECH
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