Judgment Method of Limiting Axial Depth of Cut in Stable Milling of Thin-walled Curved Surface

Abstract

The invention belongs to the technical field of milling machining of thin-wall curved surfaces and relates to a limit axial cut depth judging method for stable milling of a thin-wall curved surface. The judging method includes the steps that firstly, an instant cutting area calculating model is established according to milling machining technology parameters of the thin-wall curved surface, and cutting force coefficients are solved; then, the rigidity of a thin-wall curved surface part under different axial cut depth conditions is solved, and a correlation model between the axial cut depth and the rigidity of the thin-wall curved surface part is established, and the corresponding relation between the stable axial cut depth and the practical axial cut depth is obtained with the combination of a typical stability domain solving formula; and finally, the stability milling limit axial cut depth taking rigidity changes of the thin-wall part into consideration during machining is solved. The method is suitable for stability milling limit axial cut depth judging of various thin-wall parts, the application range is wide, the machining efficiency is improved to the maximum degree while the machining quality is ensured, and high practical value is achieved.

Description

technical field [0001] The invention belongs to the technical field of milling of thin-walled curved surfaces, and relates to a method for judging the limit axial cutting depth of stable milling of thin-walled curved surfaces. Background technique [0002] Thin-walled curved parts are widely used in the aerospace field. Due to the complex structure, large size, small cross-sectional area, and large amount of material removal, the mode of the process system is time-varying during processing, and complex processing vibrations are easily induced. At the same time, in view of the low rigidity of the thin-walled curved surface parts, the time-varying milling force in milling is easy to cause cutting chatter, which becomes an important cause of machining instability. Processing parameters are the key factors affecting the milling force of complex curved surfaces. Improper selection of process parameters will cause severe cutting vibration, affect the processing quality of thin-wal...

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Problems solved by technology

[0004] Aiming at the problem of loss of processing efficiency caused by ignoring stiffness changes in the process of solving the limit axial depth of cut of thin-walled curved surface milling, the present invention invents a stable milling limit axial depth of cut judgment method based on stiffness changes of thin-walled curved surface parts

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