Research On Chatter Stability Of Thin-walled Parts In Milling And Parameter Optimization Based On Process Damping

Milling is a very important way of processing and manufacturing,which has been increasingly applied in all kinds of metal processing industry.When milling titanium alloy thin-walled,chatter is a major dynamic instability phenomenon appeared in the process of machine tool in processing.It is caused by vibration between tool and workpiece,which seriously affected the titanium alloy thin-wall workpiece surface quality and also reduce the efficiency of production.It may lead to tool wear and damage,thus reduces the machine tool service life and cause unnecessary loss,or even cause an accident.Therefor the study of milling titanium alloy thin-walled chatter stability prediction and control is very meaningful,it is also one of the frontier subjects during the current mechanical design and manufacturing.This thesis based on the milling of titanium alloy thin-walled as the research object and also considering the influence of damping process at the same time.Analysis about machining process of the chatter stability and dynamics force.The main research content as follows:(1)For milling of titanium alloy thin-walled force problem,established ball milling cutter head of mechanics model in the process and obtain the milling force coefficient by experiment.At the same time study the influence of processing parameters on the milling force.(2)Dynamic milling system modal parameter is obtained by identification experiment system modal,analysis regenerative cutting chatter stability.At the same time study the influence of process parameters on the chatter stability.(3)For chatter problem during milling titanium alloy thin-walled,considering the influence of the process damping factor.Analysis process damping form principle.Uising multiple frequency method to study damping process chatter stability lobes diagram,at the same time compared with not considering damping process chatter stability lobes diagram.Through simulation experiment at low speeds,the process of considering the influence of damping stability will increase cutting zone.(4)The conclusion is considering damping on the chatter stability of the milling is very important.This thesis can provide theoretical reference for the later milling.The topography and roughness values measured by simulation and experiments on the sur face roughness of thin-walled parts Milling research results:With the increasing radius of the cutter,the surface roughness decreases;with the cutter feed per tooth to reduce the amount of surface roughness decreases.Examples of cutting parameters optimization through analysis,obtained during the optimization,the wash cutting stability and surface roughness comprehensive constraints into account,final machining parameter optimization results obtained will be more in line with the actual processing.