基于快速原型的热喷涂直接金属模具制造技术

提出其于快速原型的热喷涂快速制造硬质模具技术，其原理是根据产品要求和反馈数据制作RP原型作为母模，然后通过转换制得过渡模为基模，在基模上用等离子喷涂和电弧喷涂制造出高硬度金属壳型，最后在壳型内补铸低熔点合金，获得最终注塑模具。该模具具有良好的导热性、耐腐蚀、耐高温和高机械性能，制模时间可大大缩短。     

快速成型与快速模具制造技术

介绍了快速成型制造技术（ＲＰ＆Ｍ）的基本原理和主要方法以及常用的基于ＲＰ＆Ｍ的快速模具（ＲＴ）制造技术及其工艺流程,以及快速成型与快速模具制造技术的研究进展,分析了迅速增长的快速成型与快速模具制造技术市场及经济效益。     

模具制造中的特种加工技术——快速原型技术及其在模具中的应用

论述了快速原型技术的最新进展及其在快速模具中的应用，快速原型技术已经广泛应用于模具制造。基于快速原型的快速模具制造技术主要有20多种，目前商品化的制模技术主要为间接制造工艺。CAD直接驱动制造金属模具是快速原型向快速制造技术发展的标志。     

快速模具系统工艺特点与分析

采用传统的模具加工方法,制造周期长且成本高。快速成型配合传统制模技术不仅适合单件小批的模具快速制造,而且能适应各种复杂程度的模具快速制造。介绍了基于快速成型技术的快速模具制造技术工艺原理、分类、成型方法及其技术特点以及与传统成形方式的区别。从模具的寿命,模具的制作成本,模具的生产周期等方面对几种典型快速模具制造技术系统进行了比较和归纳。分析了快速模具制造技术面临的关键问题,展望了基于快速成型原理的快速模具制造的应用前景。     

基于RP技术的快速模具制造

介绍了快速原型制造（RP）技术的发展情况和几种基于RP技术的快速模具制造方法，并对这几种快速模具制造方法做了详细介绍。最后指出RP的应用将大大促进模具制造技术的进步，对提高产品质量、加速新产品的开发以及降低工装模具的费用等方面都有积极的意义。     

基于快速成型的快速模具制造工艺分析

介绍了基于快速成型的快速模具制造技术的工艺原理、分类、成型方法、技术特点以及与传统成型方式的区别。从模具的寿命,模具的制作成本,模具的生产周期等方面对几种典型快速模具制造技术系统进行了比较和归纳。分析了快速模具制造技术面临的关键问题,展望了基于快速成型原理的快速模具制造的应用前景。     

快速模具制造技术的现状及其发展趋势

快速成型与制造（RP＆M）作为诞生仅十余年的先进制造技术,已成功地实现了快速原型制造．目前已向快速模具制造（RT）方向迅速发展。主要介绍快速制模尤其是快速金属模具制造（RMT）技术的现状和发展趋势,比较和分析了模具快速制造的间接法和直接法的特点和问题,探讨了快速模具制造技术发展面临的关键问题及其应用前景。     

基于RP原型的等离子喷涂快速制模技术

基于RP原型的等离子喷涂快速制模工艺是一种新型快速模具制造技术。主要结合不锈钢粉末喷涂模具制造过程，重点讨论了这种模具的结构、制造原理、方法和技术关键。     

RP及RT技术的原理、方法和应用

从快速制造小批量产品样件和快速制造模具（以及模型和加工工具）方面，阐述了RP及RT技术在材料成形领域中的应用，内容涉及RP及RT技术的原因、方法和五种实用系统的工作过程和适用范围，以及快速原型制造技术在模具制造中的应用。     

基于环氧树脂快速制模技术鞋底模具的制造

分析了环氧树脂模具的制造流程,研究了鞋底环氧树脂快速模具的制造技术.经生产实践证明,应用环氧树脂快速模具可以缩短产品开发周期,并可获得满意的结果.     

基于RP技术的金属电弧喷涂模具制造的误差分析

介绍了基于RP（快速原型）技术的金属电弧喷涂模具制造工艺流程；分析了金属电弧喷涂快速模具制造误差产生的来源；通过实例说明在模具制造的三个过程（即树脂原型、石膏型和电弧喷涂模具）中，以石膏型制造过程中产生误差的可控因素较多,例如不同水固比、不同烘干温度和添加不同填料后石膏固化时会产生不同的膨胀做缩率。通过选用合适的工艺参数，可以降低模具制造综合误差。     

有限元法在热喷涂技术中的应用和发展

综述了有限元法在热喷涂技术中的应用.对有限元法作了总体的介绍,通过对国内外部分学者在热喷涂技术上数值模拟工作的介绍,阐述了有限元法在热喷涂技术中的应用现状,总结了有限元法在热喷涂技术方面应用的优势及不足,并展望了有限元法在热喷涂技术中的发展.     

小型精密CVD金刚石热沉片的制备研究

CVD金刚石具有优异的导热性能,在微电子热沉应用方面有着广阔的应用前景。利用ICP工艺制造了硅模具,利用有限元对CVD系统中硅模具的温度场和流场进行了研究,在硅模具内制备了小型精密CVD金刚石热沉片。试验结果表明模具法能够获得表面品质好、形状和尺寸精度很高的小型金刚石热沉片。     

耐泥沙磨蚀涂层研究

分析了热喷涂层试验室模拟及水轮机真机运行的试验结果。选择出耐磨性好的合金粉末和喷涂工艺，以提高水轮机和水泵的抗磨蚀性能，研究成果成功应用于引黄大泵生产，避免了腐蚀破坏。     

快速原型/零件制造技术

简述了快速原型／零件制造技术（ＰＲＭ）的特点及实施过程,介绍了几中主要的ＲＰＭ工艺技术以及它们在模具快速制造中的应用。     

电弧喷涂模具材料性能研究

通过计算不同材料的电弧喷涂层与光敏树脂模型表面之间的剪切应力,选择低熔点、低收缩率的Ｚｎ、Ａｌ作为电弧喷涂制模材料。针对涂层硬度低、疏松等不足,增加了喷砂强化工序;尝试以合金强化机理提高模具材料强度、硬度,制备了Ｚｎ－Ａｌ伪合金涂层。计算与实验结果表明,Ｆｅ、Ｃｕ等高熔点材料用作电弧喷涂模具材料存在开裂、起皮等缺陷;喷砂强化可有效地提高Ａｌ涂层的强度、硬度;Ｚｎ－Ａｌ伪合金涂层制备简单,是一种有优     

玻璃器皿冲模表面强化材料的研究

玻璃器皿成型工艺对模具材料性能的要求非常苛刻，目前常见的模具设计在周而复始的急冷、急热工况条件下，很快损坏。为此研制出适合玻璃器皿冲模表面强化的自溶性合金粉末材料，并采用热喷涂热核使模具寿命得到提高。     

A parametric investigation of arc spraying process for rapid mould making

Arc spraying has recently found its application in rapid mould making and is used predominantly as a technique for the production of the mould crust. In this paper, the influence of the spraying parameters, i.e. air pressure, loading voltage, wire feed rate, spraying distance and gun transverse velocity, on the resulting crust qualities such as the surface finish and bond strength, was investigated. Since the crust is built layer upon layer by the deposition of metal particles, particle morphology was found to play a key role in the resulting crust qualities. It was found that the particle morphology varies with the spraying parametric settings and their relationships were studied by using a Taguchi experimental technique. The results also show that air pressure is the prevailing parameter, followed by loading voltage, in determining the metal particle size, and that small particles with high deposition density lead to better bond strength. In addition, there is evidence showing that the combined effects of the particle morphology, particle impact force and particle temperature determine the resulting surface finish of the crust.     

On the process capability of the solid free-form fabrication: a case study of scaffold moulds for tissue engineering

This study applies the methodology and procedure of process capability to investigate a solid free-form fabrication technique as a manufacturing method to produce scaffold moulds for tissue engineering. The process capability Cpk and process performance Ppk of scaffold mould manufacture using a solid free-form fabrication technique has been analysed with respect to the dimension deviations. A solid free-form fabrication machine T66 was used to fabricate scaffold moulds in this study and is able to create features that ranged from 200 microm to 1000 microm. The analysis showed that the printing process under the normal cooling conditions of the printing chamber was in statistical control but gave low process capability indices, indicating that the process was 'inadequate' for production of 'dimension-consistent' scaffold moulds. The study demonstrates that, by lowering the temperature of the cooling conditions, the capability Cpk of the printing process can be improved (about threefold) sufficiently to ensure the consistent production of scaffold moulds with dimension characteristics within their specification limits.     

High temperature friction and wear characteristics of various coating materials for steam valve spindle application

Various coatings such as chromium carbide (deposited by plasma spraying and detonation gun techniques), chromium oxide, chromium oxide+titania+silica, NiCrAlY, and Al₂O₃+NiAl, all deposited by plasma spraying; stelliting, and surface nitriding have been applied on X20CrMo V121 steel. This steel is used for high temperature applications such as steam turbine valve spindle. Friction and wear behavior of the surface coated and treated materials have been studied at an elevated temperature of 550°C while rubbing against graphite-filled stellited steel. These studies have been carried out on SRV Optimol reciprocating tribometer. Test parameters for tribological studies have been selected with a view to simulate operating conditions encountered in operation. Additionally, the structure, porosity, hardness, bond strength, and thermal cycling behaviour of these surface coated/treated materials have been characterised. Based on these laboratory investigations, chromium carbide coating deposited by plasma spraying technique has been identified as the most suitable coating for steam turbine valve spindle application. Process parameters have been established for deposition of chromium carbide coating by plasma spraying technique on actual valve spindles. The field results obtained are found to be commensurate with the laboratory findings.