A deduced cutting force prediction model for circular end milling process is presented in this paper. Traditional researches on cutting force model usually focus on linear milling process which does not meet other cut...A deduced cutting force prediction model for circular end milling process is presented in this paper. Traditional researches on cutting force model usually focus on linear milling process which does not meet other cutting conditions, especially for circular milling process. This paper presents an improved cutting force model for circular end milling process based on the typical linear milling force model. The curvature effects of tool path on chip thickness as well as entry and exit angles are analyzed, and the cutting force model of linear milling process is then corrected to fit circular end milling processes. Instantaneous cutting forces during circular end milling process are predicted according to the proposed model. The deduced cutting force model can be used for both linear and circular end milling processes. Finally, circular end milling experiments with constant and variable radial depth were carried out to verify the availability of the proposed method. Experiment results show that measured results and simulated results corresponds well with each other.展开更多
China is working on an improved drug rehabilitation regulation that drops work as a form of treatment China is going to release a new regulation soon to give detail to the rules for forced-and-isolated rehab treatment...China is working on an improved drug rehabilitation regulation that drops work as a form of treatment China is going to release a new regulation soon to give detail to the rules for forced-and-isolated rehab treatment,a new measure replac- ing forced drug treatment through labor, according to an official with the China Narcotics Control Foundation(CNCF). Chen Xingyou,Secretary General of展开更多
Thrust ripple such as end force,slot force and normal force are key factors that affect the properties of permanent magnet linear synchronous motors(PMLSM).According to different mechanics and analytical models,end fo...Thrust ripple such as end force,slot force and normal force are key factors that affect the properties of permanent magnet linear synchronous motors(PMLSM).According to different mechanics and analytical models,end force resulting from open magnetic circuit of PMLSM was greatly decreased by optimizing the length of the PMLSM mover.Slot force caused by slot effect was greatly reduced by using fraction slot structure,and normal force was calculated through the finite element method(FEM).After thrust ripple was calculated,its uniform formula was obtained through Fourier series nonlinear regression.An experimental system was set up to measure thrust ripple,and experiment results demonstrated that experimental force ripple was quite in line with that calculated by the fit-ting formula.The optimal theory and analysis method is ef-fective,and the obtained formula can be utilized to com-pensate thrust ripple in practical applications and improve the motion performance of PMLSM.展开更多
基金co-supported by Open National Natural Science Foundation of China(No.51005183)National Science and Technology Major Project(No.2011ZX04016031)China Postdoctoral Science Foundation(No.2012M521804)
文摘A deduced cutting force prediction model for circular end milling process is presented in this paper. Traditional researches on cutting force model usually focus on linear milling process which does not meet other cutting conditions, especially for circular milling process. This paper presents an improved cutting force model for circular end milling process based on the typical linear milling force model. The curvature effects of tool path on chip thickness as well as entry and exit angles are analyzed, and the cutting force model of linear milling process is then corrected to fit circular end milling processes. Instantaneous cutting forces during circular end milling process are predicted according to the proposed model. The deduced cutting force model can be used for both linear and circular end milling processes. Finally, circular end milling experiments with constant and variable radial depth were carried out to verify the availability of the proposed method. Experiment results show that measured results and simulated results corresponds well with each other.
文摘China is working on an improved drug rehabilitation regulation that drops work as a form of treatment China is going to release a new regulation soon to give detail to the rules for forced-and-isolated rehab treatment,a new measure replac- ing forced drug treatment through labor, according to an official with the China Narcotics Control Foundation(CNCF). Chen Xingyou,Secretary General of
基金supported by the National Natural Science Foundation of China(No.50475101).
文摘Thrust ripple such as end force,slot force and normal force are key factors that affect the properties of permanent magnet linear synchronous motors(PMLSM).According to different mechanics and analytical models,end force resulting from open magnetic circuit of PMLSM was greatly decreased by optimizing the length of the PMLSM mover.Slot force caused by slot effect was greatly reduced by using fraction slot structure,and normal force was calculated through the finite element method(FEM).After thrust ripple was calculated,its uniform formula was obtained through Fourier series nonlinear regression.An experimental system was set up to measure thrust ripple,and experiment results demonstrated that experimental force ripple was quite in line with that calculated by the fit-ting formula.The optimal theory and analysis method is ef-fective,and the obtained formula can be utilized to com-pensate thrust ripple in practical applications and improve the motion performance of PMLSM.
