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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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    Strip Casting by a Single Roll Caster Equipped with a Scraper

    Toshio HagaKazuya AkitsuTakanori YamabayashirShinji Kumai...
    P.122-127页
    查看更多>>摘要：A scraper was equipped to a single roll caster to improve the free solidified surface. The scraper contacted to the free solidified surface at the constant force. The some mount of semisolid layer at the surface was removed and the surface became flat. The scraper was made from the mild steel plate. The mild steel plate was covered by the insulator paper to prevent the cooling of the melt by the plate. The melt pool was made on the roll by the side dam plates, back dam plate and the scraper. Therefore, a tip or a nozzle was not needed. The AA5182 and AA6022 aluminum alloy were cast. The as-cast strips could be cold rolled. The microstructure of as-cast strip was not uniform at thickness direction. However, the microstructure became uniform after the cold rolling and the annealing.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Roll Casting of Three Layers Clad Strip

    Toshio HagaMasakazu SawaiRyoji NakamuraTakanori Yamabayashi...
    P.128-133页
    查看更多>>摘要：A roll caster, which could cast the three layers of clad strip directly from the molten metal, was designed, assembled and tested. The base strip was AA3003 aluminum alloy and overlay strips were AA4045 aluminum alloy. An unequal diameter twin roll caster was modified to cast clad strip. Two small rolls were amounted on a large roll. A scraper plate was used to prevent the mixture of the different kinds of melts. The casting of three strips and the connecting of strips could be operated by one roll caster. The interfaces between the strips were clear, and the mixture of the melt did not occur. The clad strip could be cold rolled without the annealing. The clad strip did not peel at connecting surface by the cold rolling and continuous bending. The strips were connected strictly. The casting speed was 20m/min, and this speed was much higher than the casting speed of the conventional twin roll caster for aluminum alloys.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Parameter Design for the Counter-Blanking Process Using the Finite Element Method and the Taguchi Approach

    Sutasn Thipprakmas
    P.134-139页
    查看更多>>摘要：There is an increasing demand for high quality metal stamped parts. In general, burr formation is the main defect found subsequent to the blanking process. This defect must be strictly removed specifically for consumer products in order to prevent any kind of injury to the operators. Such a removal process results in an increase of the production cost. The unique merit of the counter-blanking process focuses on fabricating the burr-free blanked parts. However, it is difficult to control the numerous process parameters involved in this process in order to achieve the burr-free blanked parts. Thus, this study aims at investigating the process parameter design for the counter-blanking process by means of combining the finite element method (FEM) and statistical analysis techniques, including the Taguchi method and the analysis of variance (ANOVA) techniques. The results indicate that the process parameter of blanking clearance has a major influence on the die-roll formation features of the burr-free blanked part, respectively followed by the punch penetration depth and the same level of influence of the two process parameters of punch and die diameters in the second step. To conclude, this technique could be applied as a tool to achieve good quality of the burr-free blanked parts by optimizing the value of the process parameters and their favorable combinations.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Application of Back-Up Ring in Fine-Blanking Process

    Suthep YiemchaiyaphumJin MasahikoSutasn Thipprakmas
    P.140-145页
    查看更多>>摘要：Considering the advantages of the fine-blanking process, the smooth-cut surface without further operation could be fabricated. However, one of the major problems of the fine-blanking is the occurrence of the die-roll formation. This problem is the main factor which affects the quality of the fine-blanked parts. In this study, to reduce the amount of die-roll formation, the application of back-up ring was proposed. The finite element method (FEM) was used to investigate the effects of back-up ring. In addition, the effects of bridge width were also investigated. The FEM simulation results illustrated that the mechanism of back-up ring and the effects of bridge width could be theoretically clarified base on the material flow analysis. The FEM simulation and experimental results showed the good agreement with each other. Therefore, the application of back-up ring could reduce the amount of die-roll formation on the fine-blanked parts. In this study, the amount of die-roll formation increased as the bridge width increase and it was constant at the bridge width of over 15 mm.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Analysis of Plate Bending in Coilbox by Finite Element Method

    Xianglong YuQuan YangZhengyi Jiang
    P.146-151页
    查看更多>>摘要：Using finite element method (FEM), the results of bending conditions of the intermediate plate at the bending rolls of a coilbox between the roughing and finishing stands in a hot strip mill were obtained. The intermediate plate was coiled in a coilbox, which effectively overcame the problem of temperature drop by reducing surface area exposed to radiant heat loss during the waiting period. Different states of the plate in the coilbox were simulated by FEM, and the mathematical model of the bending rolls was established, which was in accord with the simulation results that the plate was coiled. As the bending shape of the front end of the intermediate plate is crucial to coiling process, the curvatures of the plate were predicted through FEM. In addition, the roll diameter and arrangement affect the optimum curvature, thus the parameters for bending rolls were determined without many adjustments. The developed bending model has been applied to actual coilbox in plant.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Draw Bending of Load-Adapted Sheet Metal Profiles

    Juergen RosenbergerDietmar SuesseSven HuebnerVolker Ulbricht...
    P.152-157页
    查看更多>>摘要：The draw bending process represents an alternative for the flexible and inexpensive production of open sheet metal profiles. This paper introduces the draw bending process with its functional principle and specifies the most important characteristics. It includes the key results of several research projects dealing with draw bending to prove the applicability of this technique to produce customized profiles.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Fabrication of Ultrafine Grained Copper Alloy by 3-Layers Accumulative Roll-Bonding Process

    Cha Yong LimHyoung Wook KimSeong Hee Lee
    P.158-163页
    查看更多>>摘要：The 3-layers accumulative roll bonding process (ARB) has been attempted to increase the strength of copper alloy (Cu-0.02wt.%P) by refining grain size. The 3-layers accumulative roll bonding was conducted up to 7 cycles at room temperature without lubrication. Microstructural evolution of the copper alloy with the number of the 3-layers ARB cycles was investigated by optical microscopy (OM), transmission electron microscopy (TEM), and electron back scatter diffraction (EBSD). The average grain size has been refined from 20 μm before ARB to 170 nm after 7 cycles of 3-layers ARB. More than 70% of ultrafine grains formed by 3-layers ARB were composed of high angle grain boundaries. The average misorientation angle of ultrafine grains was 30.7 degrees in the center of the specimen. Tensile strength after 7 cycles of 3-layers ARB was 605 MPa, which is about 3.2 times higher than the initial value.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    The Effect of Heat Treatment on Formability of Ultra-Fine Grained AA6061 for Bolt Manufacturing

    Jun-Seok ChoiYoung-Gwan JinYong-Taek Im
    P.164-169页
    查看更多>>摘要：Equal channel angular extrusion (ECAE) was used before and after artificial aging to investigate the effect of heat treatment on formability of bulk nanostructure of commercially available aluminum alloy of AA6061 in the present study. In the ECAE, route A was applied up to four or eight passes by using the split dies set-up. The three-stage bolt forming using the ultra-fine grained specimens was carried out to check formability of the material. In the present experiments, the bolt forming was successful with the specimen prepared by the ECAE after artificial aging whilst it was not successful with the specimen prepared by a reverse process sequence. The strength increase was confirmed by the tension and microhardness tests and compared to the result of conventional AA2024 bolt made by the conventionally heat treated specimen. It was found that the strength was comparable to the level of the heat treated conventional one although the actual value was a little bit lower. In addition, it was demonstrated that the heat treatment sequence is important to achieve proper formability of the ultra-fine grained material to manufacture the high strength bolt.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Design Technique Research of Fine-forged Spur Bevel Gear Tooth Profile Modification

    Huanyong CuiXijie TianDongliang Wang
    P.170-176页
    查看更多>>摘要：Gear tooth profile modification can be featured to improve working stability of gear equipments, abate noise and vibration, enhance loading ability and prolong usage life of the gears. Fine forged spur bevel gear are formed with molds, so it is economical to modify the gears by means of modifying mold cavity. Whether the modified gears can be separated from the mold with easiness is proposed to be the basic criterion of gear tooth profile modification design. Near the big ends and tooth roots is mainly the area which affects demolding after modification. According to the modified gear configuration, mathematical model is built to calculate the demolding check at any modification points on the fine forged spur bevel gear profile. And a corresponding program is developed, which is the main tool for the gear tooth profile modification design, and practical calculation has carried out.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Design and Simulation Based on Virtual Prototype of New Apparatus for High Velocity Compaction

    Hangjian GuanMing ShaoZhiyu Xiao
    P.177-182页
    查看更多>>摘要：High velocity compaction (HVC) is one of the latest technologies of powder metallurgy (PM), while the prices threshold of Hydropulsor's HVC presser limited massive application of this technique in vast minor PM enterprises in Mainland China. In the light of this, the paper delivers a new design of HVC apparatus which adopts mechanical springs groups instead of hydraulic cylinder as hammer driver. The virtual prototype and simulation of new HVC apparatus is brought about. The result of simulation shows that new design can basically meet the demand of HVC.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd