System calibration method for measuring head of coordinate measuring machine

A coordinate measuring machine and system calibration technology, which is applied in the field of system calibration for the measuring head of the coordinate measuring machine, can solve problems such as low measurement accuracy, limited application of optical measuring heads, and high price of optical measuring heads

CN103697824AActive Publication Date: 2014-04-02BEIJING INFORMATION SCI & TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-04-02

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Abstract

The invention provides a system calibration method for a measuring head of a coordinate measuring machine based on a master ball. The system calibration method comprises the steps of a) putting the standard ball with known radius R on a working platform of the coordinate measuring machine; b) installing the measuring head at a movable end of the coordinate measuring machine, controlling the coordinate measuring machine to move the measuring head according to a proper movement trajectory and completing the point scanning of the master ball on the working platform within a measurement range, wherein the point scanning approximately and uniformly covers the surface of the entire master ball to obtain N groups of data, N is larger than or equal to 200 and each group of data comprises the measuring point numerical value of the measuring head, the three-coordinate position reading of the coordinate measuring machine and the rotating angle of a gyrator; c) on the basis of the operation in the previous step, selecting partial data of the N groups of data, performing coordinate conversion, bringing the data into a spherical constraint equation and solving an over-determined nonlinear equation set by using an improved nonlinear least square method to obtain parameters to be calibrated and complete the system calibration.
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Description

technical field

[0001] The invention relates to a system calibration method for a measuring head of a coordinate measuring machine. Background technique

[0002] With the development of modern industry and the progress of science and technology, many parts are miniaturized in size and freely complicated in shape. Due to the need for three-dimensional measurement of the free-form surface, in the actual measurement, the contact needs to constantly change the spatial position to complete the scanning of the sampling points, which greatly increases the difficulty and accuracy requirements of measurement and detection.

[0003] In practical applications, because the three-coordinate measuring machine has the advantages of large measurable space, high precision and strong versatility, the coordinate measuring machine is often used to obtain the spatial position of the contact, and then further obtain the measured point of the free-form surface through coordinate conversion. Space...

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Embodiment Construction

[0019] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0020] The objects and functions of the present invention and methods for achieving the objects and functions will be clarified by referring to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The essence of the description is only to help those skilled in the relevant art comprehensively understand the specific details of the present invention.

[0021] The present invention is described in detail in conjunction with schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional view showing the structure of the device will not be partially enlarged acc...