A new milling methodology with the equivalent normal curvature milling model machining freeform surfaces is proposed based on the normal curvature theorems on differential geometry. Moreover, a specialized whirlwind m...A new milling methodology with the equivalent normal curvature milling model machining freeform surfaces is proposed based on the normal curvature theorems on differential geometry. Moreover, a specialized whirlwind milling tool and a 5-axis CNC horizontal milling machine are introduced. This new milling model can efficiently enlarge the material removal volume at the tip of the whirlwind milling tool and improve the producing capacity. The machining strategy of this model is to regulate the orientation of the whirlwind milling tool relatively to the principal directions of the workpiece surface at the point of contact, so as to create a full match with collision avoidance between the workpiece surface and the symmetric rotational surface of the milling tool. The practical results show that this new milling model is an effective method in machining complex three- dimensional surfaces. This model has a good improvement on finishing machining time and scallop height in machining the freeform surfaces over other milling processes. Some actual examples for manufacturing the freeform surfaces with this new model are given.展开更多
An important task of world energy is to solve the problem of controlled thermonuclear fusion and the information presented in the article can be used in power engineering to create a controlled thermonuclear reactor. ...An important task of world energy is to solve the problem of controlled thermonuclear fusion and the information presented in the article can be used in power engineering to create a controlled thermonuclear reactor. The method now used magnetic localization of plasma does not allow sustaining stable thermonuclear plasma in a closed chamber, and so another solution to the problem is necessary. In this paper, we propose an alternative dynamic approach of the stationary localization of plasma through centrifugal force. Localization of plasma as plasma whirlwind allows us to control the process of stable thermonuclear fusion.展开更多
The British prime minister seeks to boost relations with countries on three continents Gordon Brown has started his diplomatic road show. In making the rounds,
基金China Postdoctoral Science Foundation(No.2005037348)Science and Technology Research Program of Hubei Province,Ministry of Education,China(No.D200612003)
文摘A new milling methodology with the equivalent normal curvature milling model machining freeform surfaces is proposed based on the normal curvature theorems on differential geometry. Moreover, a specialized whirlwind milling tool and a 5-axis CNC horizontal milling machine are introduced. This new milling model can efficiently enlarge the material removal volume at the tip of the whirlwind milling tool and improve the producing capacity. The machining strategy of this model is to regulate the orientation of the whirlwind milling tool relatively to the principal directions of the workpiece surface at the point of contact, so as to create a full match with collision avoidance between the workpiece surface and the symmetric rotational surface of the milling tool. The practical results show that this new milling model is an effective method in machining complex three- dimensional surfaces. This model has a good improvement on finishing machining time and scallop height in machining the freeform surfaces over other milling processes. Some actual examples for manufacturing the freeform surfaces with this new model are given.
文摘An important task of world energy is to solve the problem of controlled thermonuclear fusion and the information presented in the article can be used in power engineering to create a controlled thermonuclear reactor. The method now used magnetic localization of plasma does not allow sustaining stable thermonuclear plasma in a closed chamber, and so another solution to the problem is necessary. In this paper, we propose an alternative dynamic approach of the stationary localization of plasma through centrifugal force. Localization of plasma as plasma whirlwind allows us to control the process of stable thermonuclear fusion.
文摘The British prime minister seeks to boost relations with countries on three continents Gordon Brown has started his diplomatic road show. In making the rounds,
