Study On Key Technology Of Cylindrical Groove Machining In

Carbon fiber reinforced plastic(CFRP) have a wide application prospect in military industries and aerospace due to their high specific strength, high specific modulus etc.Its characteristics such as laminated structure and anisotropy leads to extremely uneven cutting force during processing.The structure and size of the boring bar are restricted because of the deep-hole of CFRP and the alveolars distribution in the deep-hole.This produces the low stiffness of the boring bar,which can easily lead to vibration in the cutting. The tool was easily worn and processing efficiency was low. This article has done the research on key technology of CFRP sabot part deep hole alveolar machining.Firstly, the research of the CFRP processing mechanism were studied. And the process route of CFRP part deep hole alveolar was formulated according to the shape features of sabot part. The processing scheme of it was analysed after that. And profile cutter was designed for it.Secondly,through the study of CFRP deep hole alveolar processing characteristics,a special dynamical vibration absorption boring bar structure was designed and the dynamic model of it was established. The dynamical vibration absorption boring bar was developed after that. The damping ratio of boring bar is analyzed by means of modal test,which determines the parameters of rubber band and damping fluid of shock absorber. The damping ratio of dynamical vibration absorption boring bar to the ordinary carbide boring bar can be increased by 492.5%. The damping performance of dynamical vibration absorption boring bar was analyzed by ANSYS and cutting test,it was found that the amplitude of chatter vibration of dynamical vibration absorption boring bar is carbide boring bar’s 5.95%,and its dynamic stiffness is 15.85 times more than the ordinary carbide boring bar. The dynamical vibration absorption boring bar can effectively reduce tool wear.Tool wear can be reduced by 7.4% when boring.Besides, it can improve the surface quality and reduce the cutter pattern generated by cutting tool vibration.Finally, the tests of boring and deep hole alveolar machining with vibration absorption boring bar were carried out. The cutting force and surface quality under different machining parameters were analyzed. It was concluded that better processing results of boring can be gotten when the cutting depth, cutting speed, feed rate were 0.3mm,34m/min,0.06mm/r. And the optimal parameters of cutting speed and feed rate of alveolar processing were 18m/min and 0.032mm/r.