Aluminum alloys are subjected to large deformation and decreased strength due to the high expansion modulus caused by heat effects during friction stir welding （FSW）.The optimum conditions for friction stir welding ...Aluminum alloys are subjected to large deformation and decreased strength due to the high expansion modulus caused by heat effects during friction stir welding （FSW）.The optimum conditions for friction stir welding of 5052-O and 6061-T6 Al alloys were determined.The optimum traveling and rotation speeds were identified to be 61mm/min and 1600r/min using various mechanical characteristic evaluation methods.展开更多
Based on the realization of moving-bed cake filtering, the concepts of static-bed filtering time and moving-bed fil- tering time in the helical-conveyor fine coal filtering centrifuge were proposed, and the mathematic...Based on the realization of moving-bed cake filtering, the concepts of static-bed filtering time and moving-bed fil- tering time in the helical-conveyor fine coal filtering centrifuge were proposed, and the mathematic relations between the time defined and the main factors related were studied in detail. The results show that the static-bed filtering time is the function of the spiral heads and the rotation rate deference between the spiral and the porous drum, while the moving-bed filtering time is the function of the cone angle of the porous drum, the radius of the porous drum, the spiral angle, and the rotation rate deference. The functions deduced are of great significance for fine coal filtering centrifuge＇s parameters determining and optimizing. It is shown that the filtering centrifuge with smaller spiral angle, smaller rotation rate deference, and smaller cone angle may do a better job for fine coal dewatering.展开更多
The links of Motoman HP6 arc welding robot are considered as an open kinematic chain which consists of a series of rotational joints through concatenation. One end of the open chain is fixed to the base or the earth, ...The links of Motoman HP6 arc welding robot are considered as an open kinematic chain which consists of a series of rotational joints through concatenation. One end of the open chain is fixed to the base or the earth, and the other end which is free fastens the end executor to complete various duties. Each link of this arc welding robot has four kinds of Denavit-Hartenberg parameters: common normal length between two adjacent links, angle of two adjacent joints, distance between the crossing of common normal length and two joints axes, and angle of two adjacent links. The displacement relation between each link of the Motoman HP6 arc welding robot is introduced, and the kinematic positive-going solution and the kinematic passive-going solution are calculated.展开更多
文摘Aluminum alloys are subjected to large deformation and decreased strength due to the high expansion modulus caused by heat effects during friction stir welding （FSW）.The optimum conditions for friction stir welding of 5052-O and 6061-T6 Al alloys were determined.The optimum traveling and rotation speeds were identified to be 61mm/min and 1600r/min using various mechanical characteristic evaluation methods.
基金Supported by the National Nature Science Foundation of China （51174204）
文摘Based on the realization of moving-bed cake filtering, the concepts of static-bed filtering time and moving-bed fil- tering time in the helical-conveyor fine coal filtering centrifuge were proposed, and the mathematic relations between the time defined and the main factors related were studied in detail. The results show that the static-bed filtering time is the function of the spiral heads and the rotation rate deference between the spiral and the porous drum, while the moving-bed filtering time is the function of the cone angle of the porous drum, the radius of the porous drum, the spiral angle, and the rotation rate deference. The functions deduced are of great significance for fine coal filtering centrifuge＇s parameters determining and optimizing. It is shown that the filtering centrifuge with smaller spiral angle, smaller rotation rate deference, and smaller cone angle may do a better job for fine coal dewatering.
文摘The links of Motoman HP6 arc welding robot are considered as an open kinematic chain which consists of a series of rotational joints through concatenation. One end of the open chain is fixed to the base or the earth, and the other end which is free fastens the end executor to complete various duties. Each link of this arc welding robot has four kinds of Denavit-Hartenberg parameters: common normal length between two adjacent links, angle of two adjacent joints, distance between the crossing of common normal length and two joints axes, and angle of two adjacent links. The displacement relation between each link of the Motoman HP6 arc welding robot is introduced, and the kinematic positive-going solution and the kinematic passive-going solution are calculated.
