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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    Evaluation of Heuristics for a Resource-Constrained Project Scheduling Problem

    Shisheng ZhongXuyun FuLin LinGuolei Wang...
    p.122-125页
    查看更多>>摘要：The resource-constrained project scheduling problem (RCPSP) exists widely in engineering. There have been many heuristics for the RCPSP, therefore, how to evaluate them and then choose a proper algorithm, is a focus issue recently. This paper presents a new evaluation method of heuristics for a special RCPSP based on activity-on-the-node networks. The method is aimed at finding at the regression equation between network measures and a performance measure. Technical details of the method, which include the design of a random network generator, the definitions of network measures and its concrete steps, are discussed. A case study in an electric machinery manufacturing enterprise illustrates that the evaluation method is good practice.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research on the Influence of Cutting Fluids on the Critical Depth of Cut in Diamond Cutting of Optical Glass BK7

    Ming ZhouPeng JiaMin Li
    p.126-129页
    查看更多>>摘要：In diamond cutting of optical glasses, the magnitude of critical depth of cut for brittle-ductile transition is an important factor affecting the machinability of the work material in terms of production rate and surface quality. In this work, scratching tests with increasing depths of cut were conducted on glass BK.7 to evaluate the influence of the cutting fluid properties on the critical depth of cut. Boric acid solutions of different concentrations were selected as cutting fluids in the tests. The resulting scratches were examined utilizing a white light interferometer and the values of the critical depth of cut were determined based on the observations of the micro-morphology of the scratch surfaces produced. Experimental results indicated that compared with the process without cutting fluid action, the critical depth of cut in diamond cutting of glass BK7 can be increased by using boric acid solution as the cutting fluid.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Study on Critical Heat Flux in Grind-hardening

    Zhengguo ZhangPeiqi GeLei ZhangWenbo Bi...
    p.130-133页
    查看更多>>摘要：The hardening characteristics could be achieved by a proper selection of the grinding conditions. It is necessary to keep the heat flux above the critical limit for the film-boiling and the austenitization within the grinding zone. In this paper, a critical thermal analysis was presented to calculate the critical heat flux, following the methods for predicting thermal damages in creep grinding and high efficient grinding. The appearances of the hardening phenomena were predicted for dry grinding and wet grinding. It also can guide the selection of the grinding conditions. Theoretical analysis was verified by the experiments. Measurements are found to be in good agreement with the theoretical predictions.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Simulation of Microstructure Evolution Coupled with Fabrication Temperature for Two-Phase Ceramic Tool Materials

    Bin FangChuanzhen HuangChonghai XuSheng Sun...
    p.134-137页
    查看更多>>摘要：A computer simulation coupled with fabrication temperature for the sintering process of two-phase ceramic tool materials has been developed using a two-dimensional hexagon lattice model mapped from the realistic microstructure. The relationship between fabrication temperature and microstructure evolution is proposed. The mean grain sizes of simulated microstructures by Monte Carlo Potts model integrated with fabrication temperature increase with an increase in fabrication temperature, which is consistent with the experiment results.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Simulation of Microstructure Evolution Coupled with Fabrication Pressure for Two-Phase Ceramic Tool Materials

    Chuanzhen HuangBin FangChonghai XuSheng Sun...
    p.138-141页
    查看更多>>摘要：A computer simulation coupled with fabrication pressure for the sintering process of two-phase ceramic tool materials has been developed using a two-dimensional hexagon lattice model mapped from the realistic microstructure. The mean grain size of simulated microstructures by Monte Carlo Potts model integrated with pressure increases with an increase in fabrication pressure, which is consistent with the experiment results. Monte Carlo Potts model coupled with fabrication pressure is suitable for simulating the microstructure evolution at the different fabrication pressure during the fabrication of ceramic tool materials.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    FEM-based Dynamic Performances of HSK Spindle/Toolholder Interface

    Song ZhangXing Ai
    p.142-145页
    查看更多>>摘要：In the present paper, a dynamic modeling approach is presented to determine the contact stiffness and structural damping between the spindle and the toolholder; and then, the spindle and the toolholder are coupled by some springs and dampers. Finally, the dynamic performances of the HSK-A63 spindle/toolholder interface are analyzed by means of finite element method (FEM). From the simulated results, it can be seen that the natural frequencies of the first two modes increase with the increase of the rotational speed, which make the HSK spindle/toolholder interface appear good dynamic performances and be suitable for high-speed machining.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research on Simulating and Modeling Method for Spiral Bevel Gears with Actively Controllable Contact Patterns

    Bin YaoDeyun ZhangShimin Mao
    p.146-149页
    查看更多>>摘要：An innovative modeling method of spiral bevel gear is presented in detail for actively controllable contact patterns. Firstly the 3D model gear of is given, and then creates its modified model by analyzing the contact patterns of work condition. Lastly, being based upon meshing theory, the modified gear moves relatively to the pinion blank, and simultaneously carries out Boolean Subtracting on the pinion blank, which is the modeling process of a pinion's tooth surfaces. With this method, modeling of spiral bevel gears is more convenient to get, and gear contact patterns is easier to control actively.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Diamond Tool Wear Mechanism in Ultra-precision Turning of SiC_p/Al Composites

    Yingfei GeJiuhua Xu
    p.150-153页
    查看更多>>摘要：The wear pattern and its mechanisms of Single Crystal Diamond (SCD) tool has been investigated experimentally and theoretically during ultra-precision turning of SiC particle-reinforced aluminum matrix composite. The results showed that micro wear, chipping, peeling, abrasive wear and chemical wear were the dominating wear patterns of SCD tools. Coupled with XRD analysis on the machined surface and Raman studies on the flank wear land of SCD tool, it was pointed that the combined effects of abrasive wear of SiC particles and catalysis of copper in the aluminum matrix have caused the severe graphitization.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Quasicontinuum Simulation of Effect of Crystal orientation and Cutting Direction of on Nanometric Cutting of Single Crystal Copper

    Hongmin PenQingshun BaiYingchun Liang
    p.154-157页
    查看更多>>摘要：Quasicontinuum simulation of nanometric cutting was conducted on single crystal copper to investigate the effect of crystal orientation and cutting direction on nature of deformation of this material. The model reduces the degrees of freedom in simulations of nanometric cutting process without sacrificing important physics. The simulation results show the crystal orientation and cutting direction have a significant effect on the nature of deformation of nanometric cutting process. In addition, the variations of strain energy of workpiece atoms in different crystal set-ups are investigated.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on Performance and Mechanism of High Efficiency Organic Grinding Liquid for Ceramics with Silicon

    Xinli TianJunfei YangChao LiuFang Guo...
    p.158-161页
    查看更多>>摘要：This study selected three types of organic substance as the main components of high-efficient organic grinding liquid for grinding ceramics with silicon. The grinding efficiency test was conducted on the basis of self-developed grinding mechanism and the findings indicated that the grinding performance of all these three types of grinding liquid were better than average grinding liquid. With Si_3N_4 Ceramics as the representative test material, the grinding efficiency can be increased at least 1.37 times and more than twice with the grinding fluid prepared with oleic acid or oleic alcohol. The analysis of liquid-solid interface with the help of infrared spectrum showed that there existed abnormal vibration peaks in the liquid-solid interface between Si_3N_4 ceramics and grinding liquid with (organic substances)-OOH and -OH under normal temperature, which resulted from the adsorption effect of hydrogen bond generated between organic molecule and Si_3N_4 ceramics. Under high grinding temperature, the friction chemical reaction took place as the result of the absorption effect and the resultant could not only reduce the surface hardness, but also improve the lubricating effect, thus improving the grinding efficiency and surface quality.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd