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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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    Wavelet Neural Network - based Research on Online Wearing Prediction of TI6AL4V Cutter in High Speed Milling

    Hongyu ZhuWeijin ChenYing Li
    p.205-208页
    查看更多>>摘要：TI6AL4V is a kind of hard-machining material, which has bad thermal conductivity, good chemical reactivity, little elastic modulus, great friction coefficient, severe work hardening, short cutter life, low machining efficiency and poor machining surface quality. To improve the machining efficiency, reduce machining cost and improve products quality, the cutting tool wear is the key factor affecting machining quality, machining efficiency and production safety. In this paper, a test system which takes TI6AL4V as the research object, and the dynamic milling force during the high speed milling as the detection signal is built for online tools wear prediction. The method of wavelet packet transform and neural network are presented to diagnose and predict the situation of tools wear. The practical example shows that this system has good practicability and could identify the tools wear states exactly through verification tests.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    The Influence of Milling Parameters on Surface Residual Stresses during Milling AF1410 Ultrahigh Strength Steel

    Ge SongJianfeng LiJie SunFeng Jiang...
    p.209-212页
    查看更多>>摘要：AF1410 steel is a kind of high alloy ultrahigh strength steel with perfect hardness, strength and fracture toughness after secondary hardening heat treatment. The distribution of residual stresses affects the fatigue life and stress corrosion resistance of the components in service. Little investigation about the residual stresses on AF1410 steel had been studied previously. The distribution of surface residual stresses on the components should be controlled by the machining process. In this study, two AF1410 workpieces machined by the orthogonal end-milling experiment of AF1410 were performed. The axial depth of cut, cutting speed, feed rate per tooth and radial depth of cut were involved in to the experimental factors. The residual stresses were measured by X-ray diffraction method. The influence of milling factors on distribution of surface residual stresses was studied with range analysis method. The influence sequence of the factors on surface residual stresses were obtained and the optimum value of cutting parameters were selected.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research on the Stress Intensity Factor of the Crack Inclined across the Interface of Cermet Cladding Parts

    Junru YangZhaoqian LiChuanzhen HuangQuanwei Wang...
    p.213-216页
    查看更多>>摘要：Basing on the theoretical study on the stress intensity factor (SIF) of the crack inclined across the interface of the cermet cladding part, the finite element analysis (FEA) of the crack's SIF is made. The change laws of the SIF with the load action angle ψ, the load Q, the clad thickness ratio h_1/h, the elastic modulus ratio E_1/E_2, the inclined angle of the crack β_1 and the crack length ratio α_1/α_2 obtained. The research results have theoretical and steering significance on the wide application of the cermet cladding part.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Experimental Investigation of the Effect of Ozone in Green Cutting

    Rongdi HanHui WangYanli TangYang Wang...
    p.217-220页
    查看更多>>摘要：In recent years, environmental concerns call for the reduced of cutting fluids in metal machining. The green cutting techniques are to be studied to achieve this objective. In this paper, application of ozone gas in metal cutting was investigated, compared with oxygen gas, cutting fluids and dry cutting. The effects of ozone on cutting force, cutting temperature and chip deformation have been examined in turning of C45 steel with carbide tool YT14. The results of experiments indicated that the cutting force and cutting temperature application of ozone were reduced about 7 percent and 10 percent respectively compared with dry cutting, both of them were less than oxygen gas and cutting fluids condition. The chip deformation coefficient was also less than oxygen, wet and dry cutting conditions. The research results showed that ozone had positive effects in metal machining and it was probable to be a clean and eco-friendly coolant and lubricant under specific conditions.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study on Strengthening Mechanism of Microscale Laser Shock Peening

    Yujie FanJianzhong ZhouShu HuangMin Wang...
    p.221-224页
    查看更多>>摘要：Microscale laser shock peening (μLSP) is a novel surface treating technology which oriented to microscale metal components in MEMS. Beneficial compressive residual stress is induced at the shocked region to improve the performance of microstructure based on wave-solid interactions. In this paper, the basic principle of uLSP and mechanism of wave-solid coupling were introduced, the influence factors on strengthening effects, such as micro-size effect, anisotropy, dislocation, stacking fault, grain boundary and surface energy were discussed from the microscopic point of view, the results provide theoretical guidance for further study.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Finite Element Modeling and Tansfer Function Prediction of Ball-Screw Drive System

    Lihua LuYingchun LiangFuli YuBaoku Su...
    p.225-228页
    查看更多>>摘要：The closed-loop performance of a ball-screw drive is usually limited by a resonance in which the carriage oscillates in the direction of motion as the screw undergoes longitudinal and torsional deformation. By means of the finite element method (FEM), a model of ball-screw system dynamics is presented by taking into account the distributed inertia of the screw and the compliance and damping of thrust bearings, nut and coupling. Transmission ratio is modeled using DOFs (degree of freedoms) constraint equation. The model is found to accurately predict the transfer function from motor torque to carriage position. Comparing the predicted responses with experiments performed on a pair of ball-screw drives, the resonance frequency is misestimated as much as 5% in the worst case.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Finite Element Simulation of Drilling Based on Third Wave Systems AdvantEdge

    Rongdi HanJian Wu
    p.229-232页
    查看更多>>摘要：Drilling is one of the most complex machining processes. The 3D coupled thermo-mechanical model was developed based on Third Wave Systems AdvantEdge to study the drilling process. The workpiece was set as elastic-plastic model, which considering strains hardening, heat generation of friction in tool-chip interface and shearing deformation. Adaptive meshing technology was used, the mesh of work region refined. Contrast tests were conducted to study the chip, drilling forces and drilling temperature in drilling 45 steel and TI6AL4V. Results indicated that the results of simulation were according to experimental results; the torque of drilling TI6AL4V was less than that of drilling 45 steel, but the drilling temperature was higher than that of drilling 45 steel. Thus, finite element simulation is also an important tool to study the drilling process.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Optimization of Cutting Parameters for Surface Roughness in Cold-air Milling Ti6Al4V

    Feng JiangJianfeng LiJie SunSong Zhang...
    p.233-236页
    查看更多>>摘要：In this study, orthogonal arrays were applied in the design of the experiments and Ti6Al4V end-milling experiments were performed on the DAEWOO machining center. The white light interferometer was used to obtain the average surface roughness (Ra). A quadratic model was proposed to fit the experimental data of the surface roughness. And the fit model was used to optimize the cutting parameters in the given material removal rate. Finally the verification experiments showed good agreement with the estimated results.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Virtual Assembly Operation Modeling Based on Colored Petri Net

    Peng ChenPingjun XiaYuedong LangYingxue Yao...
    p.237-240页
    查看更多>>摘要：In this paper, a Colored Petri Net modeling method for early stage design of virtual assembly operation is presented. The characteristics of virtual assembly system, Petri Net and Colored Petri Net are analyzed. Some previous work in Petri Net application in assembly and virtual assembly system is discussed. The theoretical aspects of Colored Petri Net are introduced mathematically. Based on the mathematical presentation and the process of fasteners assembly operation, a Colored Petri Net model is constructed for the simulation of assembly operation in virtual environment. With CPN Tools software package, the simulation for evaluating the feasibility of modeling is implemented. It is demonstrated that the modeling approach can support the early stage design of virtual assembly system.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Investigation on White Layer Formation in PCBN Hard Turning GCr15

    BaoYun QiNing HeLiang LiWei Zhao...
    p.241-244页
    查看更多>>摘要：It is commonly believed that the white layer formed during hard machining of steels is caused primarily by a thermally induced phase transformation resulting from rapid heating and quenching. The focus of this study is to investigate the white layers produced on the machined surfaces and on the inner side part of the chips in dry hard turning GCr15 with PCBN tools. Samples of machined workpiece and chips were metallographically processed and observed under a microscope to determine whether white layers were present or not. Some properties of white layers were deduced in order to verify some of the prevalent theories. More specifically, chip shapes were studied to determine how they developed during machining with potential appearance of white layers, with a view to correlating the chip shapes with the white layer formation.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd