Complex surface workpiece positioning method based on particle swarm optimization

Abstract

The invention discloses a complex surface workpiece positioning method based on particle swarm optimization. The complex surface workpiece positioning method based on particle swarm optimization is used for solving the technical problem that an existing complex surface workpiece positioning method is poor in positioning accuracy. According to the technical scheme, a plurality of workblank surface measurement points Qi are acquired first; all the acquired workblank surface measurement points are imported into a CAM system programming coordinate system where a theoretical model of a part corresponding to the measurement points according to the coordinates of the measurement points in a machining coordinate system; the workblank surface measurement points Qi and the surface P of the theoretical model of the part are pre-registered in the CAM system with a rough positioning method, and an initial transformation matrix from the surface of the theoretical model of the part to the workblank surface measurement points is acquired; on the basis of the pre-registering, an accurate transformation matrix from the surface of the theoretical model of the part to the workblank surface measurement points is acquired; the product of the initial transformation matrix and the accurate transformation matrix serves as the final transformation matrix which acts on cutter location point coordinates acquired in the programming coordinate system of the CAM system, the positioning result is reflected into the NC program, and thus the positioning is completed. The complex surface workpiece positioning method based on particle swarm optimization achieves high positioning accuracy.

Description

technical field [0001] The invention relates to a method for locating workpieces with complex curved surfaces, in particular to a method for locating workpieces with complex curved surfaces based on particle swarm algorithm. Background technique [0002] In the machinery manufacturing industry, the precise positioning of workpieces is an important prerequisite for ensuring product quality. For workpieces with regular shapes, the positioning of the tool is often achieved directly by using its reference plane. In contrast, most workpieces with complex surfaces lack clearly defined geometric features, and there is no datum plane for positioning, making their positioning extremely difficult. For this type of workpiece, the traditional method is to use special fixtures and alignment tools to manually align and position, which is not only costly and inefficient, but also difficult to guarantee positioning accuracy. At present, with the rapid development of digital detection tech...

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Problems solved by technology

[0005] In order to overcome the shortcomings of poor positioning accuracy of the existing complex curved surface workpiece positioning methods, the present invention provides a complex curved surface workpiece positioning method based on particle swarm optimization

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