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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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    Application of the Grey-Taguchi Method to the Optimization of Metal Injection Molding (MIM) Process

    Khairur Rijal JamaludinNorhamidi MuhamadM.N.A. RahmanS. Ahmad...
    P.63-68页
    查看更多>>摘要：The Grey-Taguchi method was adopted in this study to optimize the injection molding parameters for the MIM green compacts with multiple quality performance. A Grey relational grade obtained from the Grey relational analysis is used as the quality performance in the Taguchi method. Then, the optimum injection molding parameters are determined using the parameter design proposed by the Taguchi method. The result concluded that the mold temperature (D) is very significant, by the fact that the ANOVA shows its contribution to excellent surface appearance as well as strong and dense green compacts is 38.82%.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Parameter Optimization of Injection Molding Ti-6Al-4V Powder and Palm Stearin Binder System for Highest Green Density Using Taguchi Method

    Nor Hafiez Mohamad NorNorhamidi MuhamadSufizar AhmadMohd Halim Irwan Ibrahim...
    P.69-74页
    查看更多>>摘要：In this paper, the titanium alloy powder of Ti-6Al-4V is mixed with binder 60wt% of palm stearin and 40wt% of polyethylene for metal injection molding (MIM) process. Injection molding parameters has been optimized using Taguchi method of L~(27) (3~(13)) orthogonal array. Highest green density has been identified as the green part quality characteristic or as an output for this study. Parameters optimized are the injection pressure, injection temperature, powder loading, mold temperature, holding pressure and injection speed. Besides those, interaction of the injection pressure, injection temperature and powder loading were studied. The analysis of variance (ANOVA) is employed to determine the significant levels (α) and contributions of the variables to the green density. Results show that the injection pressure has highest significant percentage followed by injection temperature, powder loading and holding pressure.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Fabrication and Detection for the Skeletons of Micro Aerial Vehicle Using Precision Injection Molding

    Jeou-Long LeeChao-Hsien HoYi LinYung-Kang Shen...
    P.75-80页
    查看更多>>摘要：In this work, skeletons of micro aerial vehicle are fabricated by precision injection molding. The Taguchi method is adopted to identify the important factors that govern the shrinkage of MAV skeletons. The results indicate that the most significant factor in the shrinkage of a skeleton formed by precision injection molding is the mold temperature.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Study of Metal Powder Extrusion and Accumulating Rapid Prototyping

    Jibin LiZhangong XieXiaohui ZhangQigao Zeng...
    P.81-86页
    查看更多>>摘要：A new method, namely Metal Powder Extrusion & Stacking Modeling is proposed in this paper based on RP and Metal Injection Molding (M1M) principle. Stainless steel powder and thermoplastic paraffin wax-based binder are used in our experiment. Firstly, feedstock is generated by mixing power and binder in a rotor internal mixer. Then the granular feedstock is put into screw-extruder devices to extruded filament, and accumulating green part at atmospheric status. Finally, green part is thermal defatted and sintered in hydrogen atmosphere to product the sintered parts. The testing results are as follows. The density of our RP product is 73.75%. The average shrinkage rate is 7.51%, 18.00%, and 29.31%, for diameter, thickness and volume respectively. Brinell hardness is HB77.52, while bending strength is 457MPa and tensile strength is 163Mpa. The experimental results verify that our proposed method is promising.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    An Analytical Approach to the Extrusion Pressure of Bimetallic Tube

    Guoliang XieJing LiuJingtao HanPeijie Yan...
    P.87-92页
    查看更多>>摘要：In this paper, the extrusion process of bimetallic tubes is discussed, and the extrusion pressure is calculated based on the method of energy conservation, according to the three categories of metal flow that may occur during the process. A number of parameters, geometry of bimetallic tube, mechanical properties of material components and friction conditions, are highlighted in this analytical method. Compared with the data of TP3041/20G bimetallic tubes which were extruded at 1100-1200 ℃, the calculated results show a good agreement with the industrial results, with the error less than 10 %. It also proves that the friction between the two layers play an important role in the process.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Numerical Investigation of Extrusion through Bezier Shaped Curved Die Profile

    Akshaya Kumar RoutKalipada MaitySushant Kumar Rath
    P.93-97页
    查看更多>>摘要：The die profile plays an important role in reduction of extrusion load, evolution of uniform micro-structure and overall improvement of surface integrity of extruded product. In the present investigation, a numerical analysis has been carried out for extrusion through cosine die profile using DEFORM software for plane strain deformation using rigid plastic material. The extrusion load has been predicted. The effective stress, strain, strain rate and velocity distribution have been determined. It is proposed to investigate the evolution of uniform microstructure and the effect of strain hardening in the extrusion process in future work.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Analyses of Plastic Flow and Die Design during Hot Extrusion of Magnesium Alloy Strips

    Yeong-Maw HwangShih-Ming Tu
    P.98-103页
    查看更多>>摘要：This study involves analyses and experiments of hot extrusion of magnesium alloy strips. Hot compression tests were firstly conducted to obtain the magnesium alloy's plastic flow stresses at high temperatures. These data are used in the finite element simulations of the thin strip extrusion process. Using the FE simulations, the flow pattern of the magnesium alloy billet within the die, the temperature variation and the thickness distribution at the die exit were analyzed. The effects of different die bearing height design, initial billet temperatures and ram speed on the extrusion load, the temperature at the die exit and the product thickness distribution were also discussed. Finally, hot extrusion experiments were conducted and the experimental values of the extrusion load and dimensions of the products were compared with the analytical values to validate the analytical model. Sound products were obtained using the best designed bearing heights and other appropriate extrusion conditions.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Analytical Solutions and Finite Element Modelling of Deep Drawing Process for Cylindrical Metal Cups

    Jeerachai SupasuthakulPeter Damien HodgsonMatthias WeissChunhui Yang...
    P.104-109页
    查看更多>>摘要：Analytical modelling of deep drawing process is of value in preliminary process design to illustrate the influence of major variables including friction and strain hardening on punch loads, cup dimensions and process limits. In this study, analytical models including theoretical solution and a series of finite element models are developed to account for the influences of process parameters including friction coefficient, tooling geometry and material properties on deep drawing of metal cups. The accuracy of both the theoretical and finite element solutions is satisfactory compared with those from experimental work.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Deformation Behavior of Ultra-Thin Metal Foils in Strip Drawing Friction Test

    Tetsuhide ShimizuKen-ichi ManabeMing Yang
    P.110-115页
    查看更多>>摘要：This study focuses on the surface deformation of thin metal foils caused by friction. To clarify the effect of the relative ratio of surface plastic region to the foil thickness on global deformation behavior, strip drawing tests for ultra thin metal foil with 20μm and 100μm thickness were conducted As a result, different surface deformation and elongation behavior under the same friction condition were observed in different thicknesses. Aided by finite element analysis of the friction test, the contribution of the deformation caused by friction to the foil elongation was investigated and the importance of the friction on material deformation in metal foil forming was demonstrated.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Analyzing of Stainless Elliptical Cup Drawing Process

    You-Min HuangYi-Wei Tsai
    P.116-121页
    查看更多>>摘要：A methodology of formulating an incremental elasto-plastic three-dimensional finite element model, which is based on Prandtl-Reuss flow rule and von Mises's yield criterion respectively, associated with an updated Lagrangian formulation, is developed to simulate elliptical cup drawing process. An extended r_(min) algorithm is proposed to formulate the boundary conditions, such as the yield of element, maximum allowable strain increment, maximum allowable rotation increment, maximum allowable equivalent stress increment, and tolerance for nodes getting out of contact with tool. In order to verify the reliability and accuracy of the FEM code, the fractured thickness of a specimen in the simple tension test is adopted as the fracture criterion of forming limit in simulation. A set of tools was designed to perform the elliptical cup drawing experiment on the hydraulic forming machine. According to the simulation and experimental results, the limit drawing ratio (LDR) amounts to about 2.136 for penetration in the elliptical cup drawing process of this study. This paper also found a comparison of the LDR of different tool radii. According to the definition of LDR, when the die radius is increased from R3.0mm to R9.0mm, the LDR would increase from 2.11 to 2.157. When the punch radius is increased from r3.0mm to r9.0mm, the LDR would increase from 2.07 to 2.181. This paper has provided a better understanding of the elliptical cup drawing process for improving the manufacturing processes and the design of tools.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd