A Prediction Method of Milling Chatter Stability Based on Overdamping Effect

Abstract

The invention provides a milling chatter stability prediction method based on the over-damping effect. During the process of milling the workpiece, the method obtains the geometric structure parameters of the milling tool and the dynamic parameters of the milling process, and determines the plow during the milling process of the workpiece within a tooth rotation period. The total energy generated by the cutting force, using the law of energy conservation, is used to obtain the equivalent linear process damping coefficient. The equivalent linear process damping is converted into the equivalent process damping in the x direction and the equivalent process damping in the y direction. The equivalent process damping coefficient in the x direction is and the equivalent process damping coefficient in the y direction are input into the milling dynamics equation to obtain a milling dynamics model based on the process damping effect. The ZOA method is used to solve the milling dynamics model based on the process damping effect, and a chatter stability model based on the process damping effect is obtained. Thus, the relationship between the ultimate stability depth of cut and the tool speed is obtained, and the chatter stability lobe diagram based on the process damping effect is drawn.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and in particular relates to a method for predicting milling flutter stability based on an over-damping effect. Background technique [0002] Milling is widely used in industries such as aerospace molds, and regenerative chatter is one of the main constraints to improving production efficiency. The development of high-speed machining theory avoids the occurrence of chatter by selecting the spindle speed to synchronize the cutting frequency of the cutter teeth with the chatter frequency. The classic chatter lobe map provides accurate stability predictions during high-speed milling stages with high material removal rates. However, in the low-speed machining stage, due to the existence of a large number of complete vibration wavelengths within one rotation cycle of the spindle, the lobe diagram is too dense, so that the classical chatter theory is often unable to accurately predict the stabilit...

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Problems solved by technology

[0003] The research on the process damping effect is mainly concentrated in the literature of foreign experts and scholars, and there are relatively few domestic researches in this field.

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