A novel shaft-less double suction mini pump

A novel double suction shaft-less mini pump was developed for heat control of small energy systems in this study.The mini pump impeller with an exit diameter of 40 mm was combined with the motor rotor supported by the hybrid dynamic bearing.The specific speed of the pump was 125 min-1 m3 min-1 m.The hydraulic performance of the pump was investigated experimen-tally under four rotational speeds.From the test results,it was recognized that the pump could provide a flow discharge of 5 L/min and head of 1.5 m,w...     

四坐标侧铣加工中的误差分析

首先将四坐标侧铣加工存在的加工误差分为由四坐标加工自身的局限性引起的误差和法矢异向误差两种,然后分别对这两种误差的产生原因进行了分析并给出了计算公式,另外还给出了法矢异向误差沿直母线方向的分布并提出了一种减小法矢异向误差的算法.     

CRYSTALLIZATION AND HARDNESS CHANGE OF RAPIDLY SOLIDIFIED Fe-C-Si-Mo ALLOYS

Crystallization behavior of rapidly solidified Fe-C-Si-Mo alloy ribbons made by single rol-ler method together with their changes in phase and hardness have been studied by X-raydiffraction and SEM.The results show that the alloys attribute their very high Vickershardness to numerous fine carbides formed during crystallization.