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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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    Towards Smart and Competitive Sustainable Machining

    Liu Peiling
    P.301-305页
    查看更多>>摘要：Computer Numeric Control (CNC) revolutionized the machining technology and has been the cutting edge of digital manufacturing since 1950s. CNC machining model, simulation, verification, and optimization have been a vivid research topic of Smart Machining that automated the CNC programming (CAM) and cutting process, hence greatly increased machining productivity since 1990s. This paper traces back the history of CNC simulation, analysis the different CNC machining models, tested with application examples, and listed different CNC verification industry applications for the last 20 years. The new challenge comes from sustainable manufacturing. Towards smart and competitive sustainable machining, CNC model and simulation will be used to optimize the machining process, where the raw material could be saved through First Part Correct technology, the energy could be saved through cutting speed optimization, and used parts could be saved by remanufacturing.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Integrated Production Planning, Scheduling and Shop Floor Tracking system for High-Mix Low-Volume Manufacturing - A Consortium Approach

    Tay Jin ChuaChak Huah TanT. X. CaiG. H. Phua...
    P.306-310页
    查看更多>>摘要：In Singapore, the Precision Engineering (PE) industry is the backbone of the manufacturing sector; it supports a large number of manufacturing industries such as Electronics, Chemicals, Pharmaceuticals, Biotechnology, Aerospace, Oil & Gas and Automotive. From our recent visits to companies in the PE industry, it was observed that given such a dynamic and stochastic manufacturing environment, most of these PE companies are still predominantly using Microsoft Excel as their planning & scheduling tool, shop floor tracking is normally performed manually through paper traveler, and production status is only updated at the end of the day or as and when demanded by customer. The common problems highlighted include inability to provide realistic delivery commitment, machine and manpower resources are not optimally utilized to fulfill customer orders, unacceptable order cycle time and lack of production visibility. Therefore, there is an increasing demand and impending need for a computerized integrated production planning/scheduling and shop floor tracking system. In this paper, a consortium approach for the development of an integrated production planning/scheduling and shop floor tracking system for the High-Mix Low-Volume (HMLV) PE environment is presented. An illustration through the implementation of the proposed system in a PE company is highlighted. With this system, companies would be able to improve their delivery performance through effective handling of ad-hoc customer orders and the ability to react to deviations or unplanned events in production.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Optimal Vacation Policy for a Manufacturing Facility using Retrial System

    Wee Meng YeoXue-Ming Yuan
    P.316-320页
    查看更多>>摘要：We consider a manufacturing system which takes vacation and subjects to breakdown. Items arrive to the production facility according to a compound Poisson process. Using supplementary variables we determine the probability generating function (p.g.f) of the system size. Under the Long Run Average Cost formulation, we show that the optimal vacation policy is either single or multiple vacation policy.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Tool Path Planning Assist System for Freeform Surface Machining

    Jiang ZhuKeisuke NomuraTomohisa TanakaYoshio Saito...
    P.321-325页
    查看更多>>摘要：With the rapid development of CG technology and 3D scanning technology, it is easy to design the freeform surface more complexly, but it also makes it difficult to machine such complex freeform surface rapidly and accurately. In this paper, a tool path planning assist system for freeform surface machining is presented. Differing from general CAM systems, in this developed tool path planning assist system, the tool path is generated based on the features of the CAD model, and focus on the applicability of material removal process. New machining strategies for both rough cutting process and finish cutting process are presented. With the assisting of this developed system, freeform surface could be machined efficiently and accurately.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Intelligent AGV Control of Autonomous Decentralized FMS by Oblivion and Memory

    YAMAMOTO HidehikoYAMADA Takayoshi
    P.326-330页
    查看更多>>摘要：This paper describes a method to control Autonomous decentralized Flexible Manufacturing System (AD-FMS) by using a memory to determine a priority ranking for competing hypotheses. The aim is to increase the reasoning efficiency of a system the author calls reasoning to anticipate the future (RAF) which controls automatic guided vehicles (AGVs) in AD-FMSs. The system includes memory data of past production conditions and AGV actions. The system was applied to an AD-FMS that was constructed on a computer. The results showed that, compared with conventional reasoning, this reasoning system reduced the number of hypothesis replacements until a true hypothesis was reached.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Planning and Optimizing Projects for MRO

    Allan N. ZhangKong Wei LyeBin MaDominic Loke...
    P.336-340页
    查看更多>>摘要：This paper addresses some difficulties common in planning and scheduling work in the MRO industries. We present a solution developed based on Microsoft Project Server for managing and optimizing the deployment of critical resources so as to maximize the project profits. We discuss the methods for managing of multiple projects based on enterprise shared resources, identifying the critical chain for multiple projects, and optimizing their makespans and costs with constrained resources using overtime and outsourcing strategies. We present some results to show the viability and efficiency of the solution in an MRO environment. Several potential research issues are identified and discussed for future research.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Design Approach for Jig in Computer Assisted Total Knee Replacement Surgery

    Abu Bakar SulongMuhammad Ilman HakimiMohd Fazuri AbdullahSan Wei Koon...
    P.341-345页
    查看更多>>摘要：During performing Computer assisted Total Knee surgery, surgeons have difficulties in orientation of cutting block before sawing procedure. The objectives of this study are develop design approach and fabrication of prototype, which able to eliminate stated difficulties. Thus, improve performance and cycle time of total knee surgery. Benchmarking with commercial product had been conducted, two designs of jig system were proposed. Selection of design was conducted using Pugh method. Two designs were compared based on specific requirements, in order to get the most acceptable design. Pugh method analysis shown that the second design give more advantages in handling, easy to operate, least cost in manufacture, and reduction of time in doing the total knee replacement than the first design. Prototype jig assembly consist of arm, base and cutting block were fabricated by rapid protyping for feasibility analysis. Then, simulation of fabrication by machining process was conducted through Mastercam Mill V8. All component were able to fabricated through machining. A prototype of jig system was fabricated using stainless steel typed SS316L, and evaluation of cutting procedure with saw bone confirmed that the second design is fulfill the objectives of this study.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Micro Incremental Forming Characteristics of Stainless Foil

    Tsutomu SekineToshiyuki Obikawa
    P.346-350页
    查看更多>>摘要：Single point micro incremental forming (SPMIF) was applied to the forming of a meso-scale pyramid. A type 304 stainless foil with a thickness of 8 μm and a household aluminum foil with a thickness of 12 μm were used as blanks. It was found that the elongation of stainless foil was relatively large in SPMIF although it is negligibly small in tensile test. Consequently, stainless foil exhibited larger ratio of elongation in SPMIF to that in tensile test than the ratio of aluminum foil. The enhancement of formability of stainless foil in SPMIF was discussed from a viewpoint of martensitic transformation. The surface condition associated with the process of SPMIF was inspected through AFM diagnosis.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Manufacturing of High-Grade Micro Components by Powder Injection Molding

    Volker PiotterKlaus PlewaTobias MuellerAndreas Ruh...
    P.351-355页
    查看更多>>摘要：Powder injection molding (MicroPIM) has a considerable potential for the production of high-value metal and ceramic micro components. This does not only apply to technical aspects but, due to the deployability of mass production, also to economic ones.The current status can be summed up by the following key data: latest trials revealed smallest structural details in the 10μm range or lower. Theoretical densities of up to 99% were achieved depending on the particular powder applied. Typical materials processed are metals (Fe, Cu, 316L, 17-4PH, W and W-alloys etc.) or ceramics (aluminum/zirconium oxide etc.). Best surface qualities were obtained with ultrafine or even nano-doped ceramic powders.Another major line of development is multi-component or assembly injection molding. These processes do not only reduce assembly expenditure, but also allow for the use of new functional material combinations. Interesting examples are ceramic micro heating elements or gear wheel/shaft samples which can be performed as fixed or movable combinations. Micro inmold-labelling using PIM feedstocks offers further promising opportunities.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Study on Application of Making Porous Micro-Structural Aluminum Oxide Template by Anodic Aluminum Oxide Processing Technology in Cell Reproduction

    Y. J. WengJ. C. HuangY. C. WengY. C. Wong...
    P.356-360页
    查看更多>>摘要：This study employed the Anodic Aluminum Oxide (AAO) method twice for AAO processing to prepare neatly-arranged aluminum oxide film micro nano porous structure, and conducted experiments by adjusting different condition parameters (current, voltage, and temperature). The experimental results showed that voltage would directly affect the pore space and surface roughness of the aluminum oxide film. In addition, after anodic treatment, the positive and negative surfaces demonstrated varying degrees of roughness under the same conditions. In this study, the experiment of surface roughness impact on cell proliferation demonstrated that cell proliferation was better when surface roughness was in the range of 0.4 nm < Ra < 1.2 nm.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd