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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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    Optimization of Milling Parameter based on Modified Genetic Algorithm

    Jingying ZhangSiqin PangQixun Yu
    p.531-534页
    查看更多>>摘要：This article establishes the multi-target optimization model of numerically-controlled milling parameter and illustrates the optimization design and system realization through modified Genetic Algorithm (GA). This system adopts double-breakpoint crossing and self-adaptive mutation and inverse operator through transgenic technology. It improves its local searching ability and calculation speed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Fabrication and Characterization of NiCr/NiSi Functional Thin Films on Temperature Measurement of Cutter Sensor

    Yunxian CuiDeshun YangQiyong ZengBaoyuan Sun...
    p.535-538页
    查看更多>>摘要：NiCr/NiSi functional thin films of temperature measurement of cutter sensor were prepared by means of advanced Twinned microwave ECR plasma source enhanced Radio Frequency (RF) reaction non-balance magnetron sputtering technique. Fabrication technologies of NiCr/NiSi thin films were studied. The Compositions, micro-morphology, general structure and depth of NiCr/NiSi thin films were analyzed by means of Electron Probe, SEM, AFM, step profiler and stereo vision micro operation system. The results showed that NiCr/NiSi thin-films were small depth, uniform compact, smooth and good continuity, composition of which was close to target.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Milling Force Modeling for Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

    Guoliang ZhangWeiwei MingMing ChenBing Han...
    p.539-542页
    查看更多>>摘要：With the development of aerospace, biomedical and chemical industries, titanium alloy Ti-5Al-5Mo-5V-1Cr-1Fe (TC18) is becoming widespread used. TC18 has even better mechanical property than Ti-6A1-4V (TC4). For better cutting TC18, simulation model was set up. PVD and CVD coated carbide inserts were used to machine titanium alloy TC18. The cutting forces were measured. Milling model was set up for the extraction of the cutting force coefficients and chip flow angle. Results were compared. All the coefficients of CVD coated carbide insert were found to be larger than those of PVD coated carbide insert. The model was proved to be reasonable after validation.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Cutting Parameters Optimization by Fuzzy Synthetic Evaluation and BP Neural Network in Milling Aluminum Alloy

    Xiaohui ZhangGuoqiang GuoMing ChenBin Rong...
    p.543-546页
    查看更多>>摘要：Aluminum alloy, as a kind of large-scaled structures, have been widely used in modern aerospace industry. In order to reduce its machining deformation, cutting parameter optimization is absolutely necessarily. By fuzzy synthetic evaluation, cutting parameters are optimized based on factors: surface roughness, residual stress, radial milling force and milling temperature. By maximal grade of membership rule, optimized values are obtained by different two methods. And by BP network with Bayesian regularization method the corresponding milling parameters are obtained too.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    An Investigation of the Wear Mechanism for Carbide Tools in Face Milling the Ti-5Al-4.75Mo-4.75V-1Cr-1Fe Alloy

    H.Z. ZhangW.W. MingM. ChenB.Han...
    p.547-550页
    查看更多>>摘要：The α+2 β type Ti-5Al-4.75Mo-4.75V-1Cr-1Fe (TC18) is a very difficult machine material for its low thermal conductivity, low elastic modulus, and high chemical activity. So how to improve the machining efficiency and prolong the tool life have got more and more attentions. In this paper, wear mechanism and wear types of coated (TiN+TiAlN) carbide tool and uncoated carbide tool are presented when face milling the Ti-18 alloy under the same machining condition. The results showed that wear types of PVD coated tool are mainly adhesive, diffusion and crater wear, while the mainly failure mode of uncoated carbide tool is tipping. So it is more appropriate to select the PVD coated tool than uncoated tool in the milling TC18 alloy process.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Machinability Evaluation of the Finish Hard Turning α+β Titanium Alloys

    Weiwei MingMing ChenBin RongBing Han...
    p.551-554页
    查看更多>>摘要：The two phase (α+ β) titanium alloys are extensively applied in aerospace, automotive, and biomedical industries owing to their excellent comprehensive performance combining of high strength-to-density ratio, good corrosion resistance, and high strength at elevated temperature. However, the poor machinability of these alloys restricts the improvement of manufacturing productivity and cost savings. In this paper, machinability of three α+ β titanium alloys was studied at the finish hard turning conditions.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Optimization of Twist Drill's Geometry for Cast iron

    Xiaohu ZhengHongzhou ZhangKai XueMing Chen...
    p.555-558页
    查看更多>>摘要：A new special drill is developed for iron cast drilling. The special drill has double point angle and 0°chisel rake angle which can decrease cutting force, tool wear and cutting temperature. Drilling performance is evaluated by trust force, torque, tool wear. The results indicate that new special drill is suitable for iron cast drilling with small cutting force and long tool life.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Force and Temperature in Dry Cutting of Hardened W18Cr4V with PCBN

    Hairong WuGuoqin HuangXipeng Xu
    p.559-563页
    查看更多>>摘要：An experimental study was carried out to investigate the effects of cutting parameters on cutting force and temperature in cutting of hardened W18Cr4V with PCBN cutter. Three components of cutting force were recorded by a strain-gauge dynamometer and the cutting temperature was measured by a nature thermocouple of tool-workpiece. The cutting parameters were arranged by orthogonal method. It is shown that the cutting temperature increased with each of the three cutting parameters and the main effecting factor is feeding speed. The three components of cutting force increased greatly with an increase in feeding speed and cutting depth. But the forces decreased a little as cutting speed increased. The main and axial cutting forces depend mainly on cutting depth whereas the radius force is mainly influenced by feeding speed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    The Application of FEM in Micro-cutting and The STUDYOF Key Technique

    Y.C. PangY. Li
    p.564-567页
    查看更多>>摘要：The application of finite element method (FEM) in conventional machining simulation has been carried on for a long time. But in micro-cutting, due to the unique mechanism of micro-cutting, such as size effect, round tool edge, minimum chip thickness and microstructure effect, there are still some bottleneck problems need to address. So this paper focuses on the current state-of-the-art surrounding the application of FEM in micro-cutting, and discusses some key techniques such as material model, chip separation, and chip-tool interaction in detail. Finally, future work of FEM simulation for the micro-cutting is recommended.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Ant Colony Algorithm and its Applications to Optimization of PID Parameters

    Shengli SongJianzhao ZhouHaitao WangHusheng Feng...
    p.568-571页
    查看更多>>摘要：In this paper, an improved ACA (IACA) is used for tuning PID parameters. Firstly, the mathematical representation of conventional digital PID controller is deduced. Then genetic algorithms (GAs) and ACA are described. Thirdly, a PID controller based on IACA is designed. Computer simulation is performed for the proposed IACA-based PID controller finally. The results show that the proposed method could search the optimization PID parameters efficiently. The tryout of the designed controller in a paver walk system driven by valve-controlled motor runs well up to present.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd