Method for determining optimal measurement region of articulated arm measuring machine for realizing on-line measurement of workpiece
A determination method and technology of measuring machines, which can be applied to measuring devices, instruments, etc., and can solve problems such as poor practicability
Inactive Publication Date: 2019-04-12
ANHUI UNIV OF SCI & TECH
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Problems solved by technology
Zheng Dateng et al. used support vector machines to obtain the optimal measurement area based on single-point measurement and the optimal measurement area based on spatial distance measurement, which proved the existence of the optimal measurement area, but this method is not practical and requires a large amount of actual measurement data
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[0037] The present invention will be further explained by specific examples below.
[0038] The articulated coordinate measuring machine in this embodiment is a six-degree-of-freedom articulated coordinate measuring machine, which consists of 3 measuring arms, 6 joints, 6 circular encoders and 1 measuring head. The above-mentioned measuring arms are the first arm, the second arm and the third arm; the above-mentioned joints are the first joint, the second joint, the third joint, the fourth joint, the fifth joint and the sixth joint; the circular encoder They are the 1st circular encoder, the 2nd circular encoder, the 3rd circular encoder, the 4th circular encoder, the 5th circular encoder and the 6th circular encoder; The encoder output is obtained;
[0039] The specific implementation steps are as follows:
[0040] Step 1, using the D-H method to establish the measurement equation p of the articulated coordinate measuring machine,
[0041]
[0042] Among them: c means cos...
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The invention discloses a method for determining an optimal measurement region of an articulated arm measuring machine for realizing on-line measurement of a workpiece. The method is applied in the technical field of coordinate measurement. The method firstly uses a homogeneous coordinate transformation to establish a conversion equation between two coordinate systems of the workpiece and the measuring machine, and then through a measurement model and an error model of the articulated arm measuring machine, a measurement model and an error model of the articulated arm measuring machine appliedto a machined workpiece measuring system are obtain; a Newton iteration method and an appropriate distribution and generalization algorithm are used, and the maximum error part conditions of the whole space are obtained; the entire measurement space is then equally divided into a plurality of small cube regions, and a maximum measurement error of each region is determined using PSO; and finally,the area at which the maximum measurement error is the smallest is found by comparison. The method can quickly and accurately determine the optimal measurement region of the articulated arm measuringmachine for on-line measurement of the workpiece, the measurement accuracy of the measuring machine can be improved, and the machining accuracy and machining quality of the workpiece are improved.
Description
technical field [0001] The invention relates to a method for determining the optimal measurement area of an articulated arm measuring machine used in the technical field of coordinate measurement to realize on-line measurement of workpieces Background technique [0002] On-line measurement of workpieces is an effective way to realize intelligent manufacturing. For workpieces that do not require high machining accuracy, articulated arm measuring machines can be used to achieve online measurement to improve the machining accuracy and quality of parts. [0003] The articulated arm measuring machine is a space open-chain series structure formed by connecting multiple rods through multiple rotating joints. It has the advantages of fast measurement speed, easy to carry, wide measurement space, less measurement dead angle, and low environmental requirements. , are widely used in automobiles and parts, molds, aerospace, steam turbines, heavy machinery and other machining industrie...
Claims
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Inventor 江磊顾嘉辉刘润泽杨鹏崔文宝李莉
Owner ANHUI UNIV OF SCI & TECH