Papers by Author: Xiao Wang

Abstract: The mechanical properties of a magneto rheological (MR) fluid in tension and shearing have been studied in the magnetic field which is generated by a coil carrying different magnitudes of DC electrical current. An experiment setup was designed and fabricated to perform this operation. The magnetic behavior of the equipment was analyzed using software of ANSYS/Multiphysics. The shear yield stress represents the effect of the interaction force along the shear direction (perpendicular to the direction of the magnetic field). The tensile yield stress of MR fluids represents the effect of the interaction force between the polarized particles along the direction of the applied magnetic field. The shearing tests showed that the shear yield stress is proportional to the external magnetic flux density with an exponent of 1.19. The tensile yield stress is about four times of shear yield stress.

Abstract: The shock wave and quasi-static state gas that were created by tradition block holing would influence the wall-rock and damage it in quarrying and cutting. For the purpose of the cutting level off and the scatheless wall-rock, the shaped charge was used for the inner cutting and quarrying in the paper. The simulation of the whole course of shaped change metal jet was performed by the ANSYS AUTODYN. The simulation shows: the top and bottom of the metal liner were collapsed slowly; the collapse velocity of the middle of liner was quicker, and a velocity gradient was formed, the focal point was the maximum velocity point. It could be concluded that the study could be used in the engineering design for stone inner cutting and the calculation of penetration parameters.

Abstract: Experimental research on the surface quality parameters such as roughness and removal rate in the precision lapping of sapphire was promoted in this paper, effects of processing parameters as load, speed of rotation, grain size and density on sapphire surface quality was studied by experiments. Results showed that lapping load and rotate speed were the most important factors on the removal rate, grain size played a key role in the removal rate and roughness under the same conditions, profile tolerance of surface shape depends on the flatness.

Abstract: Fuzzy logic is a mathematical theory of inexact reasoning that allows modeling of the reasoning process of humans in linguistic terms, and it is an effective method approved to deal with the fuzzy objects in many areas of engineering application. The purpose of this paper is to explore the relationship between grinding process parameters and surface quality parameters of sapphire wafer by using fuzzy theory and to obtain optimization parameters to enhance the processing efficiency and higher the surface quality of the sapphire in ultra-precision grinding. This paper sets up the triangular fuzzy logic model between processing parameters and surface quality parameters for precision lapping of sapphire, and 2 groups of optimization parameters are selected. Finally, the experimental results verified that the optimization parameters of sapphire lapping obtained by using fuzzy logic which can improve the grinding efficiency and the surface quality of sapphire.

Abstract: This paper presents the parameters optimization by TRIZ theory in the precision lapping of sapphire in order to realize the high efficiency and low damaged lapping. The TRIZ theory was used to optimize processing parameters of sapphire precision lapping based on much experimental data of lapping, then the conflict matrix of internal contradictions was set up and the optimization parameters was obtained. The result of experiment indicated that the face quality of sapphire was improved greatly after optimized by TRIZ. There was a conclusion that TRIZ theory can be used to optimize the processing parameters of sapphire precision lapping which is important to enrich the processing theory of sapphire.