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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

Active Publication Date: 2020-10-20
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, there are few researches on the verticality error of machine tools at present, and there is no research work to discuss the influence degree of various geometric errors on the measurement error of machine tools

Method used

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

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Embodiment Construction

[0062] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0063] The application provides a sensitive error weight calculation method for Cartesian coordinate system contour scanning measurement, which can be applied to such as figure 1 shown in the application environment. Specifically, the initial position of the probe is the origin O, the moving direction of the moving bridge of the machine tool is the X-axis, the moving direction of the slider along the moving bridge is the Y-axis, and the moving direction of the measuring column along the sliding block is the Z-axis. Cartesian coordinate system O-XYZ. o 1 x 1 Y 1 Z 1 i...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17B23Q17/22
CPCG06F30/17B23Q17/22Y02P90/02
Inventor 彭小强赖涛戴一帆陈善勇翟德德
Owner NAT UNIV OF DEFENSE TECH
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