Method for predicting shaking of impeller

Abstract

The invention provides a method for predicting the shaking of an impeller. The method includes the steps of conducting grid division on an entity model of the impeller through a finite element analysis method, dividing the machining process of the impeller into a plurality of machining sub-stages, obtaining modulus parameters of all the machining sub-stages of the impeller through the finite element analysis method, establishing a transfer function of each machining sub-stage of the impeller, obtaining the modulus parameters of a tool system and the modulus parameters of an impeller system through an experiment modulus analysis method, establishing a transfer function of a tool-impeller system, calculating the difference between the modulus parameters of each machining sub-stage of the impeller and the modulus parameters, obtained through the experiment modulus analysis method, of the impeller system, obtaining the modulus parameter deviation vector, conducting iteration on the modulus parameter deviation vector through a modulus parameter iteration function, obtaining the final modulus parameters of the modulus parameter deviation vector within the modulus parameter tolerance range of all the machining sub-stages, and drawing the milling stability lobe graph of all the machining sub-stages of the impeller.

Description

technical field

[0001] The invention belongs to the technical field of impeller machining stability prediction, and in particular relates to a method for predicting impeller flutter. Background technique

[0002] Chatter stability prediction method is a very important theoretical method in milling process. It can effectively avoid the deterioration of the machined surface quality caused by regenerative vibration during milling, making it possible to process parts without chatter; thus effectively improving the efficiency and surface quality of milling.

[0003] Currently, the use of stability lobe maps is an effective method for predicting milling chatter. The method is based on the system transfer function to establish the relationship between different spindle speeds and the axial depth of cut, and the axial limit depth of cut is used as the stability boundary condition. Since the stiffness of the thin-walled part is similar to that of the cutting tool, its machining dyn...

Images