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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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    Research on Product Platform Innovation and Evolution Based on Lifecycle

    Liang HouHaolun WangYuyi Liu
    p.285-288页
    查看更多>>摘要：To enhance the ability of product platform innovation and upgrading under Mass Customization (MC) environment, the concept of Product Platform Life Cycle (PPLC) was put forward. The innovation and evolving process and the characters of PPLC were analyzed. The Stability of the platform and its disturbance factors were discussed. A model which describes the process of product platform innovation and evolution was proposed. Then disturbance factors affecting product platform stability and platform innovation process were discussed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Optimization of Product Assembly Relations Based on Connection Reliability

    Zhaoliang JiangSisi XuanyuanZ.Q. LiXiangxu Meng...
    p.289-292页
    查看更多>>摘要：Enhancing the reliability of product becomes one of the most important ways to perfect its quality. Based on the traditional reliability definition, the definition of assembly connection reliability is presented to describe the connection ability of two assembled parts firstly. Then, the design method based on assembly connection reliability is proposed and a new step-by-step mathematical model for assigning assembly reliability to the parts and sub-systems is established. Based on the model, design scheme oriented assembly reliability is optimized.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A New Method of Pulse Technique in Gasbag Polishing

    Shiming JiWeidong ZhangMingsheng JinLi Zhang...
    p.293-296页
    查看更多>>摘要：Gasbag polishing is an automatic, flexible, controllable and practical technique, which has wide application prospect. A pulse technique based on robotic gasbag polishing system is proposed. Its main principle is to use the Pulse Width Modulation (PWM) technique to control the switching time of High-speed Solenoid Valve (HSV). It can not only control the internal pressure of gasbag, but also make the rubber gasbag present pulsation with PWM technique. Moreover, the performance of pulse technique is presented and the effects of different frequency pulse pressure on the polished surface roughness are analyzed through a series of experiments. At last, experimental results show that the pulse technique can improve the polished surface roughness more rapidly in certain extent with appropriate pulse frequency and process parameters comparing with conventional gasbag polishing way.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Explicit Finite Element Simulation of Oblique Cutting Process

    Jianying GuoMing Lv
    p.297-300页
    查看更多>>摘要：An explicit dynamic model of oblique cutting is presented. The explicit solid elements with one-point integration Lagrange algorithm were adopted, and elastic viscoplastic with thermal effect material model was used in simulation. The automatic surface to surface tiebreak contact type was employed to simulate the chip separation from workpiece. The model solves the mesh distortion caused by large deformation, so the simulation results can reveal the shearing slip phenomenon of chip material from the deformation of elements. The shape of deformed chip and the temperature distribution in chip and tool are obtained. The calculated specific cutting power are compared with published experimental data and found to be in good agreement.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Experiment and Prediction of Grinding Force on the Design of a CAM Dental Restoration System

    Xiaobao LeiWenhe LiaoNing DaiLin Zhang...
    p.301-304页
    查看更多>>摘要：To design the mechanical structure of a dental restoration system, which working parameter should be understand clearly in first, especially the grinding force, so, the experiment using the orthogonal method is employed to find out and analysis it. The orthogonal array and range analysis were employed to study the effect of the process parameter had on the grinding force when the dental CAM system is on working, all machining parameters used in the experimental process are referring to the technical requirements for dental restoration. A high accuracy machining center, a new dental bur used only for dentistry, and a zirconia block which have excellent properties for dental restoration, are been employed to conducted the experiment, made it's results believable. The experimental results demonstrated that the depth of cut, be the major parameter on cutting force, followed by width of cut. According to the result of analysis, the stress situation of mechanical structure of the CAM dental restoration system can be established. At the last part of this paper, a model for predict the grinding force is developed based on the experiment by means of linear regression analysis, which can be used to estimate the values of grinding force given certain grinding parameters. All of these indicated the direction for design the structure of system.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Realization Technology of A New Virtual Environment for Large-Scale Complex Products Assembly

    Yingxue YaoYuedong LangPingjun XiaPeng Chen...
    p.305-308页
    查看更多>>摘要：To deal with the problems of complicated process, difficult operation and low efficiency for large-scale complex products assembly, a new immersive virtual environment (VE) with virtual reality (VR) technology is built in the process of assembly planning and training. The environment is composed of a free walk machine and spherical screen projection system. In this paper, a free walk machine with movement perception function is developed to achieve natural human-computer interaction. And an approach based on two viewpoints match is adopted to improve immersive effect of stereo projection in the projection system. On the basis of that, a geometry calibration method based on Bicubic NURBS(Non-Uniform Rational B-Spline) surface matching target-controlled dot-matrix is proposed to achieve non-distorted image on spherical screen. Finally, the environment is applied in the process of satellite assembly process planning, and the display result shows that the VE development is feasible and valuable.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Finite Element Simulation for Pre-stress Hard Cutting Process of 42CrMo Steel

    B.Y. YeJ.P. LiuC.L.WuX.L. Liu...
    p.309-313页
    查看更多>>摘要：This paper puts forward a new method of pre-stress hard cutting which integrates pre-stress and hard cutting technology. A thermo-mechanical coupling model of Finite Element Analysis (FEA) for pre-stress hard cutting on material 42CrMo steel is established. In this model, chip-work separating is made by applying shear fracture failure criterion, element deletion and adaptive mesh technique based on arbitrary Lagrangian Eulerian (ALE) method. The key technology for FEA, such as intrinsic equation of workpiece material, chip separating criterion and friction model of tool-chip interface and thermal conduction equation are researched respectively. Then FE simulation of chip forming and cutting force in pre-stress hard cutting is made and relationship between pre-stress and residual stress on machined surface under various cutting conditions is got. Simulation result is compared with that of experiment and found they are good in accordance.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Optimization Design Method of High Speed Milling Cutter Based on Axiomatic Design

    Bin JiangJunjian MingWei ZhangMinli Zheng...
    p.314-317页
    查看更多>>摘要：Using the theory of axiomatic design, the optimization method of high speed milling cutter was investigated, and the optimization designs of teeth distribution and dynamic balancing were created by means of function decomposition and grey cluster analysis. Results showed that the method solved effectively the problem of parameters interaction and functions coupling in optimization design of cutter, the effects of simplifying design process and improving collaborative design were validated in development of cutter. Experiments indicated that the vibration in high speed machining aluminum alloy was depressed, the cutter held higher cutting stability, and its cutting performance met the optimization design requirement of high speed milling cutter.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Modeling of Polishing Pad Wear in Chemical Mechanical Polishing

    Mao LiYongwei ZhuJun LiKui Lin...
    p.318-321页
    查看更多>>摘要：The polishing pad's wear influences the surface accuracy of the polished wafer. A new polishing pad wear model is established using the idea of Finite Element Analysis (FEA) and the effect of polishing parameters on the wear of polishing pad is discussed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    The Experiment Research of Precision Grinding of Li-Ti Ferrite with Graphite Grinding Wheel

    Bei ZhangHonghua SuHongjun XuYucan Fu...
    p.322-325页
    查看更多>>摘要：Li-Ti ferrite used in aviation occasions needs good surface quality. In conventional grinding it is difficult to meet the surface demand. Accordingly, this paper proposed a new grinding process to change the situation. The process employed graphite grinding wheel which is always used in ultra-precision grinding of steel piece. The process can obtain good surface quality and ensure certain material removal rate. The ground surface appearance is nearly mirror-like. The lowest surface roughness of Ra value of the ground surface is 0.05 μmin the experiment. The ground surface morphology is made up of spread glazed area and dispersed minute pits. The ductile regime dominates the material removal mechanism and no surface damage is induced in the process. In consideration of the results in the experiment it can be seen that grinding with graphite grinding wheel is a good finishing procedure in ferrite machining because of its obtained high surface quality.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd