共查询到18条相似文献,搜索用时 93 毫秒
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快速成形技术的新进展 总被引:1,自引:0,他引:1
快速成形技术是集机械、电子、光学、材料等学科为一体的先进制造技术之一。论述了快速成形技术的起源,介绍了快速成形技术的应用领域及其市场分布情况。在阐述了各成形工艺在国内外新进展的基础上,讨论了该技术的发展趋势。 相似文献
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在原有快速成形技术上进行改进,提出了一种新型快速原型制造技术———光热平面快速成形技术,对它的原理进行了系统的阐述,并分析了它在理论上的可行性以及实践上的难点所在。 相似文献
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快速成形技术 (RPM)是一门新兴的制造技术 ,给模具制造企业带来了巨大的经济效益 ,被称为制造领域的又一重大突破。对RPM技术原理、方法及特点进行了分析与探讨。 相似文献
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介绍了快速成形技术的工艺过程、应用及几种典型的快速成形工艺 ,并分析了影响其精度和速度的普遍存在的问题及进展 相似文献
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《Journal of Manufacturing Processes》2002,4(2):148-152
This paper reports on preliminary results involving an experimental rapid prototyping process known as 3-D laser printing. The system builds parts by repeatedly laser printing thermoplastic cross-sectional “slice” images of a part one on top of the next. With each new layer, the total build thickness increases until the part is complete. An interesting extension to this system involves the use of a color print engine to produce selectively colored parts. Conventional rapid prototyping processes generally do not allow this sort of selective coloring. Initial results indicate that the system has considerable potential and warrants continued investigation. 相似文献
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《Journal of Manufacturing Processes》2003,5(2):118-126
Laminated tooling is a relatively fast and simple method to make metal tools directly for injection molding or resin transfer molding in the rapid prototyping field. Metal sheets are usually cut, stacked, aligned, and joined. Joining of metal sheets is usually accomplished by brazing or soldering. In the joining process, all the metal sheet layers should be rigidly joined, and thus heat should be applied to the whole volume of the laminate. Therefore, furnace brazing or diffusion bonding processes are considered suitable in laminated tooling.In this study, a rapid laminated tooling system composed of a CO2 laser, a furnace, and a high-speed milling machine was developed. From the three-dimensional information of a product, slicing into two-dimensional contours was performed and low-carbon steel sheets were cut with the CO2 laser along the paths that were created from the slicing results. The metal sheets were joined by furnace brazing and by dip soldering. Furnace brazing was for relatively high-temperature tooling processes such as injection molding, and dip soldering was for low-temperature tooling processes such as reactive injection molding (RIM). Dip soldering was introduced as a new, simple, and fast joining process of steel laminates. In both joining methods, wetting experiments were performed to ensure the optimal values of the process parameters. Finally, laminate tools were machined with a high-speed milling machine to improve the surface quality. 相似文献
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首先介绍了自然环境对装备的影响,提出了装备环境适应能力的问题,回顾了伊拉克战争中美军遇到的装备环境适应性问题并对美军采取的应对措施作了全面的介绍,最后对如何提高我军装备环境适应能力作了阐述。 相似文献
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Zhen Cui Z. Cedric Xia Feng Ren Vijitha Kiridena Lin Gao 《Journal of Manufacturing Processes》2013,15(2):236-241
Incremental Sheet Forming (ISF) is an emerging sheet metal prototyping technology where a part is formed as one or more stylus tools are moving in a pre-determined path and deforming the sheet metal locally while the sheet blank is clamped along its periphery. A deformation analysis of incremental forming process is presented in this paper. The analysis includes the development of an analytical model for strain distributions based on part geometry and tool paths, numerical simulations of the forming process with LS-DYNA, and experimental validation of strain predictions using Digital Image Correlation (DIC) techniques. Three kinds of parts include hyperbolic cone, skew cone and elliptical cone are constructed and used as examples for the study. Analytical, numerical and experimental results are compared, and excellent correlations are found. It is demonstrated that the analytical model developed in this paper is reliable and efficient in the prediction of strain distributions for incremental forming process. 相似文献
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生物酶技术在农药残留快速检测中的应用进展 总被引:24,自引:1,他引:24
综述了生物酶法快速检测有机磷和氨基甲酸酯类农药残留的某些理论与技术问题。该技术是现代生物学技术同农业环境监测技术相结合的产物。并介绍了国内外关于农药残留快速测定的方法和研究状况,在快速和现场测定等方面有着巨大的潜力,是一种极具前景的快速检测技术。 相似文献
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概述了我国农村地区水污染现状、排放特征、主要处理工艺及其优缺点,在对人工快渗系统工艺原理和污染物去除机理深入分析的基础上,总结归纳了人工快渗工艺的技术经济优势,并结合技术的工艺改进和完善,探讨了人工快渗技术的适用性。然后结合深圳市白花洞村、四川省绵阳市北川县及北京昌平区农村工程实践,分析了人工快渗技术在村级分散型污水处理工程中的实际运行效果。理论研究和工程实践均表明:人工快渗技术及其改进工艺组合系统具有工艺简单、建设运行成本低、污染物去除效率高、出水效果好等特点,可有效地解决目前农村地区因受到资金、技术、人才等因素限制造成的污水处理能力低的问题,是一项十分适合我国农村地区的污水处理技术。 相似文献
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光固化技术因其在3D打印行业中具有打印精度高且技术成熟的优势,在工业应用和学术研究方面都受到国内外的广泛关注.随着光固化3D打印技术蓬勃发展,相应而来的废弃物(光固化3D打印废塑料)作为一种新型有机固废,其增长速度不可估量,对环境带来的影响难以预计.基于现有研究,对光固化3D打印废塑料来源、处置技术和环境影响的最新研究进展进行总结分析.结果表明,光固化3D打印废塑料为共价交联热固性塑料,具有较高的活化能,内部化学结构存在对光敏感的显色基团,其原料、形成过程和目前的处置方法均可能对环境或生物体等带来潜在危害.基于此,针对光固化3D打印废塑料未来处置方式的可能性,提出展望和建议,可为光固化3D打印产业清洁发展提供助力. 相似文献