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Aluminum alloy was melted by the medium-frequency coreless induction furnace. During the late stage of melting, the larger hump phenomenon that can increase the inspiratory tendency of the melt appeared in the aluminum melt by the eddy current stirring, which resulted in the high gas content of the melt. A large number of pinholes exist in the casting because of the high gas content that is not easy to excluded after refining. This article aims to make deep analysis on aluminum alloy melting process in medium-frequency coreless induction furnace, and describes the main causes of pinhole formation, namely eddy current stirring aluminum liquid during melting process. In the meantime, paper introduces ways that prevent the hump phenomenon from appearing and reduce increasing tendency of aluminum-liquid inspiratory by proper building of furnace and adjusting of the crucible height. Source

Yang G.,Zhuzhou Professional Technology College
Applied Mechanics and Materials

This article briefly introduces the structure of the tooth shape silence chain. The touch point of the roll pins separate when the chain goes around the sprocket gear. It deduces the dimensions of the offset angle α and the roll pin angle θ with mathematics method. This preface shows when the outer circular arc R≈0.5P, the fluctuation of the chain transmission speed is the least. When R=0.5P, We deduce the size of the roll pin by the value of α, θ, R and the ultimate tensile strength, then we can get the structure parameter of the chain plate hole by the method of geometrical construction. © 2011 Trans Tech Publications. Source

Liu J.,Zhejiang University | Huo X.,Zhuzhou Professional Technology College
Advanced Materials Research

In this paper, we consider the Poisson problem with homogeneous Dirichlet boundary conditions on the bounded open domain Ω ∈ R3 and analyze convergence phenomena that appear by using cubic serendipity block elements with thirty-two degrees of freedom. By means of the standard Legendre polynomial technique, we derive an error estimate, which is not superconvergent and shows this serendipity element has not pointwise supercloseness properties. © (2011) Trans Tech Publications, Switzerland. Source

Hong M.-Q.,Zhuzhou Professional Technology College | Yin S.-X.,Zhuzhou Lince Group Casting Co.

Inlay casting iron core sometimes looses in axial direction from the running cast aluminum impeller, then the fan will cause fault such as vibration and abnormal voice etc. The effects of the two different configurations of the cast aluminum iron core on the quality of the impeller were analyzed in this paper. Structural design of inlay core and casting technology of impeller were briefly explained. Source

Sun G.,Zhuzhou Professional Technology College
Fenmo Yejin Jishu/Powder Metallurgy Technology

Powder metallurgy parts are used in automobile industry more and more widely. Only automatic forming presses are used, it' s possible to realize mass production, costs reduction, efficiency improvement. But automatic forming press set is commonly high, and mould length size is larger. The production problem can be solved effectively by mould design of PM worm wheel shaft sleeve in automobile engine due to mould manufacturing difficulty. Source

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