Sensitive error weight calculation method for Cartesian coordinate system contour scanning measurement

A Cartesian coordinate system, measurement error technology, used in measurement/indication equipment, special data processing applications, comprehensive factory control, etc., can solve problems such as the degree of influence of machine tool measurement errors that are not discussed in research work
CN111797482AActive Publication Date: 2020-10-20NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2020-10-20

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Abstract

The invention relates to a sensitive error weight calculation method for Cartesian coordinate system contour scanning measurement. The method comprises the following steps: obtaining 21 geometric error parameters of a machine tool under a Cartesian coordinate system, and expressing the geometric error parameters as a normalized geometric error function; and acquiring nominal contour coordinates ofa workpiece to be scanned and measured, inputting the normalized geometric error function and the nominal contour coordinates into a pre-constructed linearity measurement error model and angle measurement error model, and calculating measurement point coordinates of the workpiece to obtain sensitive error weight values of the 21 geometric error parameters, wherein the sensitive error weight values of the geometric error parameters are the ratios of the measurement error amplitudes to the corresponding geometric error amplitudes when the machine tool measures the workpiece. The method can accurately reflect the influence of each geometric error parameter of the machine tool on the coordinates of the measurement points, quantifies the influence degree of each geometric error parameter on the measurement error, and provides a calculation basis for error correction of the machine tool.
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Description

technical field

[0001] The present application relates to the technical field of machine tool design and manufacture and error measurement compensation, in particular to a method for calculating sensitive error weights for contour scanning measurement in a Cartesian coordinate system. Background technique

[0002] Influenced by the machine topology and manufacturing process, each machine tool has its own typical main error sources and process characteristics. In order to quickly and accurately control the main error sources of the machine tool and obtain high compensation efficiency, it is necessary to predict the error sources of the machine tool with high reliability.

[0003] Geometric error is the main source of error affecting the accuracy of machine tools. In equipment such as three-coordinate measuring machines and three-axis processing machine tools, 21 geometric error parameters are generally used to describe the basic geometric errors of the equipment, including t...

Claims

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