Incorporating tolerances of customers’ requirements for customized products

Tolerancing conventionally deals with the variation of manufacturing processes to meet the requirements of product quality. With the development in product customization, it has been generally accepted that customers’ requirements also have acceptable tolerance range. This flexibility provides an opportunity to better match customer requirements with richer product offerings through customization. A probabilistic model is presented in this paper to incorporate the tolerance of functional requirements into customized product design. By leveraging on the requirements tolerance, customers are more likely to get their desired products. Customer requirements tolerance can thus open up a new dimension for product customization.     

Optimization of mechanical properties of recycled plastic products via optimal processing parameters using the Taguchi method

The large amount of plastic products presently produced necessitates recycling and reuse of these non-biodegradable materials. However, the degradation in the mechanical properties of products made from recycled plastic is a major drawback that limits their use. This study aims to improve the mechanical properties of products made from recycled plastic by utilizing the Taguchi optimization method, instead of coupling the products with additives. By adopting L₉ Taguchi OA, products made from various compositions of virgin and recycled plastic are produced by injection moulding. Four controllable factors (i.e., melt temperature, packing pressure, injection time, and packing time), each at three levels, are tested to determine the optimal combination of factors and levels in the manufacturing process. By determining the optimal combination of factors and levels, the appropriate blending ratio of virgin and recycled plastic can be evaluated from the mechanical performance exhibited by the compound. The effects of the optimal processing parameters and the addition of recycled plastic in various compositions on the mechanical properties and melt flow index of the produced parts are also investigated. The results reveal that the product made of 25% recycled polypropylene (PP) and 75% virgin PP exhibits a better flexural modulus compared to the virgin form. The same product exhibits a 3.4% decrease in flexural strength. The degradation in mechanical properties of products produced from recycled plastic can be improved by optimizing the influence processing parameters during the manufacturing process.     

基于Web的个性化产品设计及异地资源配置系统的研究

网络技术的迅速发展和广泛使用，使企业与客户和供应商的集成成为可能。在分析基于Web的个性化产品定制现状的基础上，提出了面向客户驱动的个性化产品设计及异地资源配置系统的设计思想和总体框架。详细地分析了该系统的体系结构和运行模式，并阐述了系统实现的关键技术。系统的研究与应用，为企业参与网络化制造奠定了一定的基础。     

Optimizing the seamless tube extrusion process using the finite element method

In order to reveal the mechanism of extrusion forming for large-scale aluminum alloy seamless pipe, in this research the rigid-viscous plastic finite element method was used to analyze the effect of the technological parameters of the aluminum alloy pipe extrusion process, consistent with the use requirements.     

1100铝合金薄壁零件的工装设计与加工工艺

分析了1100铝合金电容器外壳薄壁零件的结构特点及加工工艺方案;探讨了影响加工过程中加工变形的工装方式.通过采用有效的装夹减小薄壁零件的加工变形,保证了加工质量,明显地提高生产效率.     

淘汰落后产能优化产品结构走新型钢铁工业发展道路——中国钢铁工业协会常务副会长罗冰生2006年11月14日在钢管分会第四届三次会员代表大会上的讲话(节选)

通过各钢管生产企业和广大职工的共同努力,2005年我国钢管产量达到2 781.12万t,成为全球钢管生产大国,产品质量明显提高,产品结构优化见成效,国际竞争力提高,我国已连续3年成为钢管净出口国.同时,钢管生产企业经营状况明显好转,盈利水平显著提高.     

淘汰落后产能 优化产品结构 走新型钢铁工业发展道路——中国钢铁工业协会常务副会长罗冰生2006年11月14El在钢管分会第四届三次会员代表大会上的讲话（节选）

通过各钢管生产企业和广大职工的共同努力．2005年我国钢管产量达到2781．12万t，成为全球钢管生产大国，产品质量明最提高，产品结构优化见成效，国际竞争力提高，我国已连续3年成为钢管净出口国。同时，钢管生产企业经营状况明最好转，盈利水平显著提高。     

钢材中期防锈剂的研制

为了解决钢材锈蚀问题,研制出钢材中期防锈剂－NS－823。介绍了其防锈机理及特性,并在涟钢一轧厂进行了在线防锈处理试验,取得了较好效果,其成本为每平方米钢材表面0．47元左右,室外防锈期可达3个月以上。     

应用连续碳酸化分解提高产品质量

通过对分解理论的阐述,用理论指导实践,结合中州铝厂连续碳分改造的实际,对连续碳分在工业上的应用进行了总结,指出连续碳分的优越性和应用该办法可以提高产品质量,并为碳分生产砂状氧化铝做了必要的探索。文中阐述的连续碳分改造过程、工艺指标和取得的效果值得生产厂家借鉴。     

Effect of processing parameters on microstructures and mechanical properties of rapidly solidified AlFeVSi hot-extruded product

1　INTRODUCTIONRapidlysolidifiedAlFeVSialloy ,developedus ing planarflowcastingbytheAllied SignalAlu minumCompanyofUSA ,isoneofthemostmatureheat resistantaluminumalloysatpresent.FVS0 6 11,FVS0 812andFVS12 12havebeenappliedinthein dustriesofaviationandaerospacetomeettheneedsofadvancedaircraftsforlightweightstructuralmaterialswithhighspecificstrength ,highspecificstiffnessandexcellentthermalstability[14 ] .Theblanksofrapidlysolidifiedheat resistantalu minumalloywereprocessedbyusingpl…     

加快行业技术创新步伐加大品种结构调整力度实现产品和装备国产化——中国金属学会轧钢学会钢管学术委员会常务副主任兼秘书长成海涛2008年10月23日在钢管学会五届四次年会上的工作报告(节选)

首先代表钢管学会对大家的到来表示热烈的欢迎,特别是对李鹤林院士、殷国茂院士亲临会议,并带来精彩的学术报告,表示衷心的感谢!对天津钢管集团股份有限公司为开好此次年会给予的大力支持．表示诚挚的谢意。     

北京赛福斯特公司为会员单位定制搅拌摩擦焊技术培训

为了更好的服务于国内用户,北京赛福斯特技术有限公司充分整合外部资源,在设备领域与百年机械设备企业英国精密制造集团建立了战略合作关系;同时,在技术研发领域与搅拌摩擦焊发明机构英国焊接研究所建立了紧密的技术合作关系,共同开发,合作共享。为加速新技术在企业中应用的进程,赛福斯特公司提供＂交钥匙工程＂服务,包含设备,     

Optimizing the electrode position in sacrificial anode cathodic protection systems using boundary element method

In this paper, a sacrificial anode cathodic protection problem of 2D steel storage tank was simulated using boundary element method. The tank was protected by a zinc anode located directly on structure wall. Data obtained from potentiodynamic measurements were used as boundary condition. In this study, optimum location of the anode was determined, and the influence of anode length and paint defect on the level of protection provided by system were investigated. This study showed that boundary element method is beneficial in modeling and analyzing cathodic protection systems and calculated results were consistent with expectations from the basic corrosion concepts.     

The development of porous titanium products using slip casting

An optimized titanium slurry was developed from 43 vol.% of titanium powder, 0.3 dw.% of dispersant, 0.8 dw.% of plasticizer and 0.8 dw.% of binder, mixed with a balance of distilled water, which produced a viscosity of 40 cP. It was then poured into a plaster mold to form compacts with a green density of 45%. Thermal debinding was carried out at 320 °C with an argon flow for 2 h, followed by vacuum sintering different samples at 1000 °C and 1200 °C for 0.5 h, respectively. The porous sintered compacts had satisfactory tensile strength with some plastic deformation. The increase in oxygen and carbon content during processing was minor. An X-ray diffraction pattern showed pure alpha titanium peaks without any indication of contamination from organic additives. The results from this investigation suggested that slip casting is a potentially low-cost, simple production route for manufacturing porous titanium products.     

Characterization of AISI 4340 corrosion products using Raman spectroscopy

Most of the currently available corrosion product characterization techniques require extensive samples preparation methods and cannot be employed under aqueous conditions. Raman spectroscopy possesses the advantage of characterization of the corrosion products under practical operation conditions, including aqueous, without any sample preparation procedures. The present study examines the corrosion characteristics of AISI-4340 steel at aqueous and atmospheric environments using Raman spectroscopy. FeO, Fe₂O₃, and Fe₃O₄ were observed as the main corrosion products. The measured oxides thicknesses ratio were compared to the theoretic value obtained from Tammann equation.     

Taguchi统计学分析方法优化Al 7068-TiC纳米复合材料的凝固行为

采用机械合金化和热压工艺制备高强Al 7068?5%TiC(质量分数)纳米复合材料。基于致密化的重要性和晶粒生长的影响,以获得较高抗压强度为目标,采用Taguchi统计法对制备Al 7068?5%TiC块体纳米复合材料的热压条件进行优化。结果表明：在500 MPa和385°C下热压30 min能获得抗压强度为938 MPa、硬度为HV 265的Al 7068?TiC纳米复合材料。此外,方差分析结果表明,外加压力是影响纳米复合材料热压过程最关键的因素。各因素对纳米复合材料热压过程影响贡献率为外加压力(61.3%)、热压温度(29.53%)和热压时间(4.49%)。     

Optimization of thermal processing parameters of Ti555211 alloy using processing maps based on Murty criterion

Isothermal compression testing of Ti555211 titanium alloys was carried out at deformation temperatures from 750 to 950 °C in 50 °C intervals with a strain rate of0.001–1.000 s~(-1). The high-temperature deformation behavior of the Ti555211 alloy was characterized by analysis of stress–strain behavior, kinetics and processing maps. A constitutive equation was formulated to describe the flow stress as a function of deformation temperature and strain rate, and the calculated apparent activation energies are found to be 454.50 and 207.52 k J mol~(-1)in the a b-phase and b-phase regions, respectively. A processing map based on the Murty instability criterion was developed at a strain of 0.7. The maps exhibit two domains of peak efficiency from 750 to 950 °C. A *60 % peak efficiency occurs at 800–850 °C/0.001–0.010 s~(-1). The other peak efficiency of *60 % occurs at C950 °C/0.001–0.010 s~(-1), which can be considered to be the optimum condition for high-temperature working of this alloy.However, at strain rates of higher than 1.000 s~(-1)and deformation temperatures of 750 and 950 °C, clear process flow lines and bands of flow localization occur in the hightemperature deformation process, which should be avoided in Ti555211 alloy hot processing. The mechanism in stability domain and instability domain was also discussed.