Curved-surface machining cutter track planning method using cutting force fluctuation as constraint

Abstract

The invention relates to a curved-surface machining cutter track planning method using cutting force fluctuation as a constraint, which belongs to the technical field of the high-efficiency milling processing for complicated curved-surface parts. According to the method, on the basis of cutter location point data obtained by an equal-residual-height method, an optimal feeding ling spacing value and an optimal feeding step length are determined, thereby realizing a cutter location grid unit division based on a cutter location grid node. With fitting of a cutter location grid unit plane, a cutter location grid node Z coordinate is determined by combining an adjacent associated cutter location grid unit. And then a cutter location grid node normal vector is calculated; and with the cutting force fluctuation during the processing process as a constraint, a curved-surface processing cutter track is planned by using the cutter location grid node as a cutter location point according to a fundamental principle of normal vector included angle minimization between adjacent cutter location points, so that the high-quality and high-efficiency curved surface processing is realized. The method has the high adaptability to the local complicated geometrical features; and high-quality and high-efficiency curved surface processing is realized.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency milling processing of complex curved surface parts, and in particular relates to a tool path planning method for curved surface processing constrained by cutting force fluctuations. Background technique [0002] Complex surface parts are widely used in aerospace, automobile, ship and mold and other fields. Nowadays, the complex surface modeling technology is relatively mature, but its high-quality and efficient processing is still a hot and difficult point in the industrial field. The multi-axis linkage CNC machine tool provides a reliable way for the processing of complex curved surfaces, and also greatly improves its processing quality and processing efficiency. In the process of NC machining, the tool path planning is closely related to the machining accuracy and efficiency of the parts, and also directly affects the tool life and the dynamic characteristics of the machine tool. Reaso...

AI Technical Summary

Problems solved by technology

The document "Tool path generation for freeform surface models" by Elber et al., Computer-Aided Design, 2004, 26(6), 490-496, aimed at the shortcomings of redundant and over-dense tool paths generated by the isoparametric line method, Invented the self-adaptive optimization isoparametric line method, the length of the generated tool path is shorter, and the processing efficiency is improved. However, the isoparametric line method is not suitable for generating the tool path of the composite surface and the trimming surface, and this method does not consider the processing The impact of the cutting force change in the process on the processing quality has certain limitations

[0004] In summary, the current research on tool path planning for surface machining only calculates from the geometric point of view of the surface, and does not consider the influence of physical factors such as cutting force fluctuations in the machining process on the quality of surface machining.

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