The progressive cutting based on auxiliary paths is an effective machining method for the material accumulating region inside the mould pocket. But the method is commonly based on the radial depth of cut as the contro...The progressive cutting based on auxiliary paths is an effective machining method for the material accumulating region inside the mould pocket. But the method is commonly based on the radial depth of cut as the control parameter, further more there is no more appropriate adjustment and control approach. The end-users often fall to set the parameter correctly, which leads to excessive tool load in the process of actual machining. In order to make more reasonable control of the machining load and toolpath, an engagement angle modeling method for multiplecircle continuous machining is presented. The distribution mode of multiple circles, dynamic changing process of engagement angle, extreme and average value of engage- ment angle are carefully considered. Based on the engagement angle model, numerous application techniques for mould pocket machining are presented, involving the calculation of the milling force in multiple-circle continuous machining, and rough and finish machining path planning and load control for the material accumulating region inside the pocket, and other aspects. Simulation and actual machining experiments show that the engagement angle modeling method for multiple-circle continuous machining is correct and reliable, and the related numerous application techniques for pocket machining are feasible and effective. The proposed research contributes to the analysis and control tool load effectively and tool-path planning reasonably for the material accumulating region inside the mould pocket.展开更多
At present, China has entered the era of market economy. Reserve youths training system has changed greatly. The training system formed by the planned economy period reserve talents, has been incompatible with the soc...At present, China has entered the era of market economy. Reserve youths training system has changed greatly. The training system formed by the planned economy period reserve talents, has been incompatible with the society, resulting in the merchandise of reserve basketball talents. Talented young players have no qualitative progress and there is no highlight on them, so do the player groups. The training of reserve sports talents is being adjusted and converted, and training a great diversity of reserve sports talents will coexist for long. The whole nation training system in the era of the planned economy, through policy intervention, the highly centralized amateur sports school, provincial sports team promoting to the national team management system, guarantees the stability of the sports teams in China, and provides reserve youth force. However, the cultural quality of the athletes and the level of scientific training are not high.展开更多
基金Supported by National Natural Science Foundation-Guangdong Collaborative Fund Key Program(Grant No.U12012081)
文摘The progressive cutting based on auxiliary paths is an effective machining method for the material accumulating region inside the mould pocket. But the method is commonly based on the radial depth of cut as the control parameter, further more there is no more appropriate adjustment and control approach. The end-users often fall to set the parameter correctly, which leads to excessive tool load in the process of actual machining. In order to make more reasonable control of the machining load and toolpath, an engagement angle modeling method for multiplecircle continuous machining is presented. The distribution mode of multiple circles, dynamic changing process of engagement angle, extreme and average value of engage- ment angle are carefully considered. Based on the engagement angle model, numerous application techniques for mould pocket machining are presented, involving the calculation of the milling force in multiple-circle continuous machining, and rough and finish machining path planning and load control for the material accumulating region inside the pocket, and other aspects. Simulation and actual machining experiments show that the engagement angle modeling method for multiple-circle continuous machining is correct and reliable, and the related numerous application techniques for pocket machining are feasible and effective. The proposed research contributes to the analysis and control tool load effectively and tool-path planning reasonably for the material accumulating region inside the mould pocket.
文摘At present, China has entered the era of market economy. Reserve youths training system has changed greatly. The training system formed by the planned economy period reserve talents, has been incompatible with the society, resulting in the merchandise of reserve basketball talents. Talented young players have no qualitative progress and there is no highlight on them, so do the player groups. The training of reserve sports talents is being adjusted and converted, and training a great diversity of reserve sports talents will coexist for long. The whole nation training system in the era of the planned economy, through policy intervention, the highly centralized amateur sports school, provincial sports team promoting to the national team management system, guarantees the stability of the sports teams in China, and provides reserve youth force. However, the cultural quality of the athletes and the level of scientific training are not high.
