Papers by Author: Tian Rui Zhou

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Authors: Da Lin Zhang, Ji Lin Guo, Tian Rui Zhou
Abstract: The CNC tool selection is an important factor affecting the CNC machining efficiency and parts processing quality. In this paper, based on the analysis of the CNC milling cutter type, structure, diameter, angle, economy and other factors, a reasonable strategy to select the tool.
Authors: Da Lin Zhang, Ke Gao, Tian Rui Zhou
Abstract: Thin wall parts are used more and more extensively in industrial production, analyze the influence of precision machining of thin-walled parts not higher factor, through the example of how to improve the machining precision of thin-wall parts, and gives the specific measures to solve practical problems.
Authors: Liang Bo Ji, Tian Rui Zhou
Abstract: Taking into account temperature-dependent thermal conduction and heat capacity, based in the research on the physical property of the material of Acrylonitrile Butadiene Styrene (ABS), a three-dimensional transient thermal finite element model has been developed in Fused Deposition Modeling (FDM). The moving material of ABS by the sprayer on the mold equipment is simulated with the employment of ANSYS parametric design language (APDL) and latent heat is considered by using enthalpy. By the technique of element live and die on ANSYS software and using the nonlinear finite element method, several conclusions according to the simulation results were produced, first of all, the simulation result shows that the temperature field distribution likes an ellipse; secondly, comparing with the previous track, the latter one has larger heat affected region and larger inhomogeneous temperature distribution; the greatest temperature gradient takes place near the edges of deposited part where the sprayer scanning direction changes.
Authors: Li Min Wang, Tian Rui Zhou, Li Juan Wang, Xiao Ling Yang
Abstract: Hot stamping represents an innovative manufacturing process for forming of advanced high strength steels, implying a sheet at austenite temperature being rapidly cooled down and formed into a die at the same time (quenching). This affords the opportunity to manufacture components with complex geometric shapes, high strength and a minimum of springback which currently find applications as crash relevant components in the automotive industry. With regard to the numerical modeling of the process, the knowledge of thermal and thermo-mechanical properties of the material is required. The material model under hot stamping condition of advanced high strength steel should be set up. The Finite Element Analysis is an essential precondition for a good process design including all process parameters. This paper presents the finite element simulation of a hot stamping process and describes a number of procedures for the simulation of hot stamping. In addition, the development direction is pointed out at the end of this paper.
Authors: Jie Zhou, Tian Rui Zhou
Abstract: The deformation ability of metals and the mechanic characteristics of metal parts are closely related to the material’s microstructure and grain size, so it’s important to study the simulation techniques of microstructure evolution. Common microstructure simulation techniques include digital simulation and graphic simulation. This paper firstly introduced the simulation techniques of microstructure, and then focused on the graphic simulation technique that can directly show grain boundary network’s evolution process. It then built a Monte Carlo model of the grain growth during super plastic deformation, and implemented the graphic illustration of grain growth using Visual Studio software. The result matched well with the experimental outcome, which proved the usability of the technique
Authors: Dong Gen Cai, Tian Rui Zhou
Abstract: The data processing and conversion plays an important role in RP processes in which the choice of data format determines data processing procedure and method. In this paper, the formats and features of commonly used interface standards such as STL, IGES and STEP are introduced, and the data conversion experiments of CAD models are carried out based on Pro/E system in which the conversion effects of different data formats are compared and analyzed, and the most reasonable data conversion format is proposed.
Authors: Tian Rui Zhou, L.J. Wang, C.H. Xiong
Abstract: The ability of metal plastic forming and the mechanism performance of the part are correlated with grain granularity of the metal. Grain growth is a prominent character of the microstructure evolution. It is very helpful for the design of process and die structure to study the mechanism of superpalstic deformation and microstructure evolution of superplastic forming. The microstructure evolution of material is impact directly the mechanic performance of the component in superplastic forming. It is necessary to optimize the complex process and to predict the microstructure evolution. A new simulation method that integration the finite element simulation and the microstructure simulation of superplastic forming is introduced in this paper. Monte Catlo method is an odds simulating technique and can simulate time course of microstructure evolution. Based on the studies of superplastic grain growth mechanism, the superplastic grain growth rate equation are derived in this paper by coupling static state anneal grain growth mechanism and deformation stimulated grain growth mechanism. The grain growth drive force of superplastic deformation includes mostly boundary energy and distortion energy. A new drive force model is derived based on energy model. The microstructure evolution is correlated with the stress and strain of the part, and the integration of superplastic forming FE simulation and microstructure evolution MC simulation is realized. Using the integrating simulation technique can predict not only the forming process but also presenting grain growth image of the part. Experimental studies of the part in forming process and microstructure evolution were performed.
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