Papers by Author: Qin Yuan Zhou

Abstract: In this paper, grinding wheel spindle of high precision CNC is researched. Mathematics - mechanical mode of dynamic balance of grinding wheel is established on the principle of rotor dynamic balance. New method of critical speed of grinding wheel is proposed, and verified by testing the reasonableness. And, dynamic unbalance of grinding wheel spindle of high precision CNC is studied on quality surface. These studies provide theoretical direction for balance speed range and the accurate level.

Abstract: Under the circumstances of 7/24 taper tooling system being widely replaced by 1/10 taper tooling system in the high-speed machining, using 1/10 taper HSK- A63 tools as the research object, this article, adopting the method of finite element method, analyzes the parameters such as clamp force, surplus magnitude and rotary speed which affect the connecting performances of 1/10 taper spindle/ tool-holder. The results of this study provide basic and useful guidance for the parameters’ selection of 1/10 taper tooling system in practical machining.

Abstract: A molecular dynamic simulation study has been performed for a large-sized system consisting of 106 liquid metal Al atoms to deeply investigate the formation and magic number characteristics of various cluster formed during solidification processes. It has been found that the numbers of various types of cluster in the system obviously possess peak values, namely, magic numbers. The first, second, third, .…,and tenth magic numbers are determined in turn in the order of 13, 19, 25(27), 31(33), 38(40), 42(45), 48(51), 55(59), 61(65), 67,…( the numbers in the brackets are the second peak values in the corresponding level of cluster). This magic number serial is in good agreement with the experimental results obtained by Harris et al, and this method determining the magic numbers from the clusters according to the level of basic cluster can be used to afford a primary scientific and reasonable explanation to experimental results.