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Workpiece attitude adjustment method based on measuring point and adaptive differential evolution algorithm

A technology of adaptive difference and evolutionary algorithm, applied in computer control, control/regulation system, instrument, etc., can solve problems such as difficult surface parameter equations

Active Publication Date: 2018-07-13
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

For irregular surfaces, it is more difficult to determine the surface parameter equations

Method used

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  • Workpiece attitude adjustment method based on measuring point and adaptive differential evolution algorithm
  • Workpiece attitude adjustment method based on measuring point and adaptive differential evolution algorithm
  • Workpiece attitude adjustment method based on measuring point and adaptive differential evolution algorithm

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Embodiment Construction

[0065] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The invention proposes a new matching algorithm to realize real-time adjustment of workpiece posture. The proposed algorithm includes initial matching and exact matching. The adaptive differential evolution algorithm (SADE) is introduced in the exact matching link to search for the best exact matching matrix, and the optimal spatial rotation of the actual point set relative to the theoretical point set is obtained through step-by-step matching. Transformation matrix R and translation transformation matrix T. Finally, the adjustment parameters of the machine tool are obtained according to the optimal transformation matrix combined with the structure of the machine tool, and the adjustment of the workpiece posture is realized.

[0066] Do point set matching:

[0067] Set the actual measurement point set of the feature surface of the wor...

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Abstract

The invention discloses a workpiece attitude adjustment method based on a measuring point and adaptive differential evolution algorithm. The method includes the steps of initial matching and accuratematching. Firstly, reference points are selected on a theoretical workpiece curved surface and an actual curved surface to build corresponding local coordinate systems, and initial matching is realized by rough alignment of the local coordinate systems. In accurate matching, a target function based on a least-square distance is built through a point set after initial matching, an optimal solutionenables a value of the target function to be minimum and is searched by the adaptive differential evolution algorithm, so that an optimal accurate matching matrix is acquired. By the two steps, a final space transformation matrix can be acquired, adjustment amount corresponding to a machine tool can be calculated by combining a structure of the machine tool, the machine tool is adjusted, so that aworkpiece attitude is adjusted, a workpiece is accurately positioned, and allowances are uniformly distributed. According to the method, attitude adjustment and accurate positioning of testing partsmachined by an ISO (international standardization organization) five-axis numerical control machine tool are achieved, and effectiveness of the method is verified.

Description

technical field [0001] The invention relates to the technical field of numerical control machining, in particular to a workpiece attitude adjustment method based on measurement points and an adaptive differential evolution algorithm. Background technique [0002] The precise positioning of the workpiece and the uniform distribution of the margin are the keys to ensure the machining accuracy. Adjusting the workpiece posture in real time to keep it consistent with the theoretical posture is a direct and effective method to achieve precise positioning and uniform distribution of the margin. The margin distribution is very important to ensure the machining accuracy, and the workpiece attitude has a significant impact on the margin distribution. In machining, due to multiple clamping and other reasons, the attitude of the workpiece is easy to change, so it is necessary to find a method to ensure the accuracy of the attitude of the workpiece. [0003] Regarding the matching probl...

Claims

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Application Information

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IPC IPC(8): G05B19/408
CPCG05B19/4086G05B2219/35356
Inventor 丁国富江磊李勇马术文黎荣梁红琴
Owner SOUTHWEST JIAOTONG UNIV
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