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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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    Parameter Optimization of Milling Ti6AI4V using GA approach

    F. XuJ.J. ZhuX. WuX.J. Zang...
    1-4页
    查看更多>>摘要：The research was carried out on the parameter optimization of milling titanium alloy in this paper. The cutting models including cutting force, tool life and machined surface roughness are obtained by orthogonal array experiments. The maximum metal removal rate, MRR is selected as objective function. The constraints related to machine tool, workpiece, cutting tool and other machining situations are presented in details. Genetic algorithm is used to search for the optimum milling parameters for the maximum metal removal rate of titanium alloy. The optimization results show the optimization system can improve the productivity of milling Ti6Al4V obviously.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Improvement of deposition uniformity in Laminated Templates Electro-deposition

    H. Fan
    5-8页
    查看更多>>摘要：Laminated templates electro-deposition (LTE) is a small-sized metallic-structure fabrication technique based on template-patterned depositing. Avoiding locally excessive electroplating at the template edge area has been proved crucial to this method. To improve deposition uniformity, auxiliary cathode and modulated double-pulse current were tried individually and assessed on their effects and efficiencies. By applying assisting cathode the deposition uniformity in plannar pattern depositing was significantly improved with an increased thickness ratio of edge to center for the plating sample. Pulse application, especially double-pulse was studied mainly on the proportion between anodic duty circle and cathodic duty circle. Through a group of optimized parameters, including current density ranging 8-10A/dm~2, anodic and cathodic duty circle of respectively 80% and 30%, frequency 300HZ, a bulk of copper parts, section size 20x20mm and 4-7mm thick were produced with a well depositing quality.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Effective Dumbbell-Tool in Nanotechnology System from Optical Device of Computer Display

    P.S. Pa
    9-12页
    查看更多>>摘要：The low yield rate of the transparent conducting oxide (TCO) is easily existent through the processes of semiconductor production. A nanotechnology system of the recycling process for removing the TCO-layer from displays' color filter surface of computer display is presented. By establishing a recycling process for the ultra-precise removal of the thin film nanostructure, the semiconductor optoelectronic industry can effectively reclaim defective products, reducing both production costs and pollution for the technical application. In the current experiment, the major interest is the design mechanism features of the removal process for a thin layer of TCO and an effective design dumbbell-tool. For the recycling processes, a small diameter of the positive-electrode, a small gap-width between the negative-electrode and the positive-electrode corresponds to a higher removal rate for the TCO-layer. A high rotational speed of the dumbbell-tool, or a high flow velocity of the electrolyte increases the dreg discharge mobility and improves the removal effect. A higher working temperature or a higher concentration of the electrolyte corresponds to a higher removal rate for the TCO-layer. An enough electric power corresponds with a higher feed rate of the displays' color filter produces a fast removal rate and reduces the production costs. An effective design of the system mechanism and the machining tool in the electroremoval processes requires quite a short time to make the TCO-layer remove easily and cleanly.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Parametric Modeling Method for Thin-Walled Frame Parts

    H.B. WuY.W.Liu
    13-16页
    查看更多>>摘要：In this study, a method called "house-building frame modeling" based on the APDL language is introduced firstly, and the finite element model of the milling distortion analysis is established for a platform structure with 192 frames by the method, and the prediction analysis of the milling distortion under different milling conditions is carried out, by means of 3-D finite element simulation technology. Comparing the simulation results and the measurement ones of the milling distortion, the proposed model is modified; the modeling method and prediction method are proved to be effective.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on Milling Process Simulation for Monolithic Components Web

    H. GuoD.W. ZuoG.X. Tang
    17-20页
    查看更多>>摘要：It is very difficult to predict the CNC milling process of monolithic components in aero-industry by either theoretical analysis or experimental research, because of their complicated structure. The machining distortion becomes one of the neck problems in the rapid development and the efficient production of our national defense weapons. The milling process of monolithic components web is simulated by 3D FEM, and the residual stress distribution and the variation tendency of the milling distortion are obtained, comparing the simulation results and the real measurement in the distortion, the proposed model is proved to be effective.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Simulation on the Melting Rate of the Iced Fixed-Abrasive Polishing Plate

    J.KangD.W. ZuoY.L.SunW.Z.Lu...
    21-25页
    查看更多>>摘要：The exchange of the heat of the IFA polishing system was analyzed at first in this paper. Then the three-dimensional temperature finite element model was set up. By changing the material of the elements, the ice-melting process was simulated. It was found that the obtained simulating results showed a good agreement with the experimental results. The temperature distribution and the melting rate were studied in the case of different technical parameters, which can be used to provide references for choosing better parameters.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Parameters optimization of laser processing CVD diamond film based on FEM simulation

    X.J.WuF.XuD.W.ZuoW.Z.Lu...
    26-29页
    查看更多>>摘要：Chemical vapor deposited (CVD) diamond film has a series of outstanding properties. However, it can not be easily machined by conventional technologies available currently for its high hardness and stability. Laser processing diamond film method can be an efficient way to process diamond film because of its high energy density. The mechanisms of laser processing diamond film are thermal oxidation, graphitization and evaporative ablation of graphite. Temperature distribution is of great importance to understand these complex phenomena taking place during the process because different temperatures lead to different physical and chemical changes of diamond. In this paper, the finite element method (FEM) software ANSYS is applied to calculate the temperature distribution. The relation between etching depth and laser machining parameters (laser power and scanning speed) is presented. The proper parameter ranges of laser power and scanning speed for a certain etching depth is also investigated with this method.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Boron-doped Nanocrystalline Diamond Films Deposited By Using DC Arc Plasma Jet CVD

    B.K. XiangD.W. ZuoX.F. LiF. Xu...
    30-34页
    查看更多>>摘要：Boron-doped micro-nanocrystalline diamond coating may be successfully prepared on Mo substrate with DC arc plasmas jet deposition device. Along with the increase of doped-boron concentration in the film, two-point resistance measurement indicates that film resistance presents exponential decrease; Raman spectrum test shows that, the characteristic peak value of diamond 1332cm-1 in the spectrum moves toward low frequency, the semi-height width of diamond peak, peak D and peak G, etc. in the spectrum is expanded, and the component of non-diamond bonds such as sp2, etc. in the film is increased; SEM and AFM observation shows that, increasing the doped-boron concentration could further subdivide the crystal grains in the film, and is beneficial for the growth of nano- or ultra-nano-crystalline diamond film; film annealing test shows that, micro-nanocrystalline diamond film with higher doped-boron concentration has better thermal stability than the micro-nanocrystalline diamond film without doped boron.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Intelligent Choice of Characteristic Parameters of Oilstone in Honing of Titanium alloy Cylinder Based on Artificial Neural Network

    Y.F. WenY.N. RuiJ.D. Cao
    35-39页
    查看更多>>摘要：Titanium alloys have good mechanical properties and organizational stability. However, due to the larger viscousity of titanium, a reasonable choice of the characteristic parameters of oilstone will directly affect the quality and efficiency of honing processing. This article solved multi-objective problem using artificial neural network with fast convergence and high precision. Based on a comprehensive analysis of the relationship between the workpiece material, materials status, surface hardness, the required surface quality and various parameters of oilstone, the improved artificial neural network algorithm-GCAQBP was adopted, through coding optimization of input and output parameters, model of intelligent choice of oilstone's parameters was constructed about titanium alloy cylinder honing processing. Through experimental studies, it is shown that the intelligent model can choose quickly with high reliability compared with the traditional experience.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Experimental Research on Cutting Forces of 5-Axis Milling of Al-Alloy Blade

    J.H. LiuG.B. BuC. ZhaoD.W. ZUO...
    40-44页
    查看更多>>摘要：The cutting force in manufacture process was observed with Kistler dynamometer. A special clamp was designed to simulate the real condition of blade cutting. Series of experiments were done. Cutting force reflected structure of the blade and movement of machine. Cutting force was changed with feed speed varied and the rotation of axis B & C. Resultant cutting force was uniform in back and basin of blade and increased with cutting speed went up. Resultant force was waved in edge of blade. Back and basin forces were lager than edge force in X direction. Force X invoked vibration.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd