A Method for Optimizing Process Parameters in Milling of Flexible Structural Parts

Abstract

The invention provides a technological parameter optimizing method for milling and processing of a flexible-structure piece. The optimizing method can ensure machining precision while ensuring the processing stability of the flexible-structure piece. A workpiece is mounted on a flexible workpiece processing experiment device to form a flexible workpiece system, and is conducted by technological parameter optimization from the following steps: (1) acquiring modality parameters of the flexible workpiece system; (2) conducting cutting kinetics modeling according to the modality parameters of the flexible workpiece system; (3) acquiring the stability range boundary of the milling cutter cutting flexible workpiece system by utilizing a time domain number value method; (4) adopting the flexible workpiece processing experiment device to conduct cutting experiment to verify the cutting kinetics modeling; (5) adopting the removal rate maximization of the machine tool main shaft cutting material and workpiece vibration minimization as optimization targets and adopting stability range boundary as constraint condition to build a flexible structure piece milling parameter optimization model; acquiring machine tool main shaft rotational speed and cutting depth of optimization through a nonlinear optimization algorithm.

Description

technical field [0001] The invention relates to the technical field of computer numerical control machining, in particular to the field of process parameter optimization of numerical control milling, in particular to a process parameter optimization method for milling of flexible structural parts. Background technique [0002] In the fields of aviation, aerospace, and energy, flexible thin-walled structural parts are widely used, and the processing accuracy and processing efficiency of parts depend to a large extent on the reasonable selection of processing parameters. In order to meet the high-efficiency and precise processing requirements of flexible structural parts, it is necessary not only to ensure the stability of the processing process, that is, no chatter, but also to ensure the processing accuracy and low cost of the parts. [0003] Existing optimization methods for machining process parameters of flexible structural parts are mainly based on the machining dynamics...

AI Technical Summary

Problems solved by technology

The stability obtained by this modeling method and the parameter optimization based on this stability have good prediction results in the cutting process of rigid workpieces, but the error is often large in the process of processing flexible structures. Due to the low structural rigidity of the structural parts, the vibration is large during the cutting process, and the vibration displacement greatly changes the cutting-in and cutting-out angle of the actual cutting edge, so that the real working conditions cannot be accurately modeled, so the obtained stability and process parameters It is not a real optimal value, which may cause high-amplitude vibration or even flutter, making it difficult to achieve efficient and precise machining of flexible structural parts

Images