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A method for separating compensable and non-compensable geometric errors of three-axis CNC machine tools

A technology of geometric error and CNC machine tools, applied in the field of CNC machine tools, can solve the problems of less research on modeling, and achieve the effect of improving production efficiency and machining accuracy

Active Publication Date: 2020-05-29
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many scholars at home and abroad have established position-dependent geometric error prediction models based on multi-body system theory, mechanism modeling method, and differential method, but there are few studies on modeling considering all position-independent geometric errors

Method used

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  • A method for separating compensable and non-compensable geometric errors of three-axis CNC machine tools
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  • A method for separating compensable and non-compensable geometric errors of three-axis CNC machine tools

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Embodiment Construction

[0046] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0047] combine figure 1 , figure 2 with image 3 As shown, the method for separating the compensable and non-compensable geometric errors of the three-axis CNC machine tool described in the present invention includes the following steps:

[0048] S1. Establish the shape generative function model of the three-axis CNC machine tool without considering the error

[0049] The structure of the three-axis CNC machine tool is expressed as:

[0050] K=T / K 1 K 2 L L K n-1 K n-2 / S

[0051] Where T and S represent tool and spindle respectively, where K i Indicates each movement axis, i is a natural number except 0, i=1, 2L L n-1, n-2; K i Including the X-axis, Y-axis, and Z-axis that move linearly along the moving axis, or the A...

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Abstract

The invention discloses a compensable and uncompensable geometric error separation method for a three-axis numerical control machine tool. According to the method, eighteen position-independent geometric errors of the three-axis numerical control machine tool are separated; a three-axis numerical control machine tool position-independent geometric error model is established based on a shape creation function; the action effect of each error on a tool nose point position error vector is separated; compensable errors and uncompensable errors in the position-independent geometric errors are separated out. Theoretical guidance and suggestions are provided for reasonable distribution of machine tool precision after conceptual design of the machine tool, theoretical basis is provided for error adjustment and compensation in the operation process of the machine tool, and the precision of the numerical control machine tool is fundamentally improved.

Description

technical field [0001] The invention belongs to the field of numerical control machine tools, and in particular relates to a method for separating compensable and non-compensable geometric errors of a three-axis numerical control machine tool. Background technique [0002] Processing quality is the primary index to evaluate whether the accuracy of machine tools meets the requirements. In modern manufacturing, curved surface parts with complex shapes are widely used in industrial products. High-precision three-axis machine tools are used in aviation, aerospace, automobiles, and medical fields. The machining accuracy and efficiency of three-axis machine tools represent a country's CNC machining level and manufacturing intelligence. [0003] The geometric error and thermal error of the three-axis CNC machine tool account for 70% of the total error. The geometric error is the key factor affecting the accuracy of the machine tool. Under the processing conditions of small feed and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/404
CPCG05B19/404G05B2219/31434
Inventor 郭世杰唐术锋兰月政何晓东曹婧华
Owner INNER MONGOLIA UNIV OF TECH