Turning tool path planning method with small cutting force fluctuation

Abstract

The invention discloses a turning tool path planning method with small cutting force fluctuation, belongs to the field of numerical control lathe precision machining process planning, and relates to aturning tool path planning method with small cutting force fluctuation for improving the surface quality of a precision machining workpiece. The method comprises the steps of representing the cuttingforce by the cutting areas in the sections of a turning tool base surface and a complex curved surface, establishing a function of the cutting areas relative to machining parameters according to local geometrical characteristics of the base surface and a workpiece curved surface section line, and keeping other parameters constant; deducing a function relationship between the cutting area and thechange of the distance between adjacent cutter contacts of the section line, and calculating the distance between the adjacent cutter contacts of the section line by taking small cutting area fluctuation as constraint; then decomposing the distance between the adjacent cutter contacts of the section line into the feed amounts of two linear shafts of a lathe along the tangent line of the section line, and recursively pushing the cutter contacts; and finally, generating a turning tool path with small cutting force fluctuation. According to the method, turning tool path planning with small cutting force fluctuation can be achieved, the implementation method is convenient, and the effect is obvious.

Description

technical field [0001] The invention belongs to the field of precision machining process planning of numerical control lathes, and relates to a turning tool track planning method with small cutting force fluctuation. Background technique [0002] Parts with complex surface shapes and curved surfaces are widely used in high-end manufacturing and other fields, and their processed surface quality is an important factor affecting the performance of high-end equipment in related fields. Complex surface parts have complex surface features. When turning is used, X / Z two linear axes linkage or X / Z / C three-axis lathe with spindle position control function are often required for cutting. Using a uniform conservative cutting amount, the kinematic parameters of the feed axis of the turning finishing machine tool and the cutting force change frequently, resulting in uneven residual stress on the surface of the workpiece, which seriously restricts the improvement of the surface quality an...

AI Technical Summary

Problems solved by technology

In this method, the unreasonable planning of the feed rate for complex curved surface turning can cause severe fluctuations in the cutting force and damage the surface quality of the machined surface. The cutting force is proportional to the cutting area, and the cutting force is represented by the cutting area between the base surface of the turning tool and the complex curved surface section. Small fluctuations in the cutting area of ​​adjacent tool contacts on the cross-section line are constrained to plan the feed rate to realize turning tool trajectory planning with small cutting force fluctuations. The implementation method is convenient and effective, and the surface quality of complex curved surface parts is significantly improved.

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