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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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    Investigation of Water Vapor as Green Coolant and Lubricant in Turning of Austenitic Stainless Steel

    Yue ZhangRongdi HanYanli TangYang Wang...
    p.409-412页
    查看更多>>摘要：It is examined that the effects of water vapor as green coolant and lubricant on the cutting of austenitic stainless steel. Compared to nitrogen, oxygen, argon and carbon dioxide gas applied and dry cutting, water vapor produced the lowest cutting force and deformation coefficients, improved the machined surface appearance and helped to chip forming and breaking. And the lubricating actions of water vapor and gases may have the relation with the molecule polarity and the capacity of adsorption in the cutting zone. All these gases and water vapor have the green characteristic without pollutions. Comparably, water vapor may be a good selection for the green machining of austenitic stainless steel.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Modeling and Micro-milling Experiments on Complex 3D Micro-mould Parts

    Qingshun BaiYingchun LiangKai YangZhi Luo...
    p.413-416页
    查看更多>>摘要：Micro-mould is a necessary and productive component for the development of MEMS. However, the machining of micro-mould parts with complex 3D surfaces becomes the key problem for the development of micro machinery. In the paper, a new machining technique was introduced to manufacture micro-mould parts. With a reverse engineering technique, point cloud data were acquired and reconstructed into a 3D model of micro mould part in a computer. The numeral control code for micro-machining was also processed with the help of micro-machining simulation. The machining experiment on micro-parts with complex 3D surfaces was conducted on self-developed micro machine tools with micro-diameter ball-end cutter. High quality micro mould parts with complex 3D surfaces were obtained under these micro-milling experiments. The results will provide a perspective resolution on the manufacturing of micro-mould parts with complex surfaces.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    FEM of Saw Tooth Chip Formation under Different Cutting Edge

    Caixu YueXianli LiuYuansheng ZhaiShengyuan Ji...
    p.417-420页
    查看更多>>摘要：The generation procedure of saw tooth chip when PCBN tools orthogonal cutting hard steel GCr15 is emulated by FEM software ABAQUS in this study. The model effectively overcomes serious element distortions and cell singularity in high strain domain caused by large material deformation. The effects of cutting edge preparation on cutting force, cutting temperature and residual stress are analyzed. Results of FEM show that cutting edge preparation has a great impact on cutting procedure. Under the same cutting condition, cutting force, temperature and residual stress of sharp edge, honed edge and chamfered edge increases in turn, and three kinds of cutting edge have the same change rule in residual stress. Chamfered edge has a good temperature distributing, and it is the best edge preparation in hard cutting.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Electrode Wear Compensation for Micro-EDM Deep Hole Drilling

    Yuangang WangMenghua WuFuling ZhaoJin Wang...
    p.421-424页
    查看更多>>摘要：Lateral and edge wear of electrodes in micro-EDM affects workpiece shape accuracy. A method that change materials property of lateral side of electrode was put forward, based on discharge performance difference of different materials, and it was demonstrated with experiments. Results show that the method proposed is more effective and improves the precision of deep holes, compared with traditional sampling methods. The technology can provide reference to practicality of micro-EDM for 3D structure cavity and deep holes.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Structure Characteristic Analysis and Optimization Design for Microsatellite

    Kan ZhengWenhe LiaoXiang Zhang
    p.425-428页
    查看更多>>摘要：According to the structural layout and mechanics characteristic of microsatellite, the FEM was established reasonably. Base on the FEM analysis and its characteristics, the structure of microsatellite was optimization designed. In the optimization process, the optimization model was established with the design variables of aluminum panel thickness, core plate thickness and skeleton thickness, and subjected to stiffness, strength, displacement and size constraints. Then, used the sequential quadratic programming method for optimization analysis. The results of the optimization demonstrates that the weight of structure loss significantly, and the whole structure weight of the microsatellite loss 11%.Meanwhile, the iterative times of the optimization process is few, so it is very Meaningful and useful for actual project application.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on Forming Characteristics of Metal Sheet by Laser Shock in Oblique Angle

    Yinfang JiangFei WangYuanyou ZhuYongyu Gu...
    p.429-433页
    查看更多>>摘要：Laser shock forming in oblique angle of metal sheet is involved due to the complexity of parts profile and multiple points forming by laser shock. The influence of incident laser angle and constraint pore diameter of the mold on the forming characteristics of metal sheet is investigated according to the experiment and finite element simulation. The results show there is a horizontal deviating deformation in the place of the maximum deformation in oblique shock, as the incident angle deviating vertical direction increases, the vertical displacement amount decreases nonlinearly and the horizontal deviating amount increases gradually; and the vertical displacement amount of sheet increases with the increase of the mold constraint pore diameter in a certain range, but decreases above this certain range. The metal sheet fractures when shock times increase, the extended crack is paralleled to roll direction of metal sheet in vertical angle shocking, but the extended cracks in oblique shocking, some is paralleled to roll direction of metal sheet, another is vertical to this direction. The forming characteristics of metal sheet under laser shocking in oblique angle is very important, which provides evidence for the large area precision forming and parameters optimization by laser shock forming.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Optimization of Tap Parameters for Internal Thread Cold Extrusion of High Strength Steel Based on Genetic Algorithm

    Hong MiaoDunwen ZuoHongjun WangHongfeng Wang...
    p.434-437页
    查看更多>>摘要：The ideal of genetic algorithm was introduced in optimizing tap parameters for internal thread cold extrusion of high strength steel. The use of genetic algorithm was analyzed in the optimization design of the extrusion tap. Based on optimal result, the extrusion tap was machined to reduce the extrusion force effectively. It was completely feasible to using genetic algorithm to optimize tap parameters for internal thread cold extrusion of high strength steel. Results from this study provide important basis for practical application of internal thread cold extrusion of high strength steel.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Effect of Discharge Parameters on Micro-surface Topography of NAK80 by Mirror-like Surface EDM

    Hongjun WangDunwen ZuoHong MiaoHongfeng Wang...
    p.438-441页
    查看更多>>摘要：The effects of discharge parameters on micro-surface topography in mirror-like surface electrical discharge machining (EDM) process were investigated, and the optimization scheme was obtained. The realization of the process parameters and their effects were analyzed by the Taguchi method. The surface roughness amd 2D micro-surface topography were measured. An L_(16) (4~4×2~3) Taguchi standard orthogonal array was chosen for the design of experiments. The level of importance of the parameters parameters on surface roughness was determined by using analysis of variance (ANOVA). The experimental results confirmed that peak current and open discharge voltage have more influence on the surface roughness on mirror-like surface EDMed workpiece in comparison with pulse duration and pulse off-time.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on the Detection Techniques of Sheet-metal Delamination Based on Laser Shock Wave

    Kaiyu LuoGuangshan SongJinlian ZhuLei Zhang...
    p.442-445页
    查看更多>>摘要：The large area delaminated (two layers) and non-delaminated samples of lmm-thick aluminium alloy 2024 were shocked by pulse laser, the restricted layer and the absorbing layer were coated on the surface of the samples, and the PVDF sensors were set on the facing of a quilt of the samples. The signs of laser shock waves were transmitted to the computer by the oscillograph. The results indicated that can be effective detected by laser shock waves, and the math model of hierarchical sheet-metal by laser shock wave was fundamentally developed. A new method to detect the large area delaminated samples was provided, which has the definite engineering importance.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Experimental Study on Residual Stresses of Al_2O_3 Coating by Laser Re-melting

    Dejun KongKaiyu LuoHong Miao
    p.446-449页
    查看更多>>摘要：The surface of Al_2O_3 coating sprayed on 40Cr substrate was re-melted with high power continuous CO_2 laser, and its micro-hardness and residual stresses were measured, respectively. The strengthening mechanism of Al_2O_3 coating by laser re-melting was analyzed and discussed. The experimental results shown that the surface of Al_2O_3 coating by laser re-melting is neat and smooth, and its compositions are even, its structures are compact, and Al_2O_3 coating is evenly distributed in its surface with grain forms, and its micro-hardness increases about 200%; Residual stress of Al_2O_3 coating by laser re-melting is changed into compressive stress from tensile stress, which is benefit to improving bonding strength of coating-substrate interface.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd