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《机械工程与自动化》2017,(6)
目前快速成型制件的成形精度制约着该技术的推广和发展,对于给定的设备,设置不同的工艺参数将会对最终模型的成形性能、制件精度和质量等构成较大差异。分析了FDM快速成型技术的成型原理和特点,研究了分层厚度和成形角度对阶梯效应的影响。 相似文献
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激光熔覆成形技术的研究进展 总被引:17,自引:3,他引:14
激光熔覆成形技术是近年来发展起来的一种新型的先进制造技术.该技术将激光熔覆表面强化技术和快速原型制造技术相结合,具有成形零件复杂、结构优化、组织性能优良、加工材料范围广泛、柔性化程度高、能实现梯度功能和无模近终成形等独特优点,可广泛应用于复杂零件的直接制造和修复,具有广阔的应用前景.介绍激光熔覆成形技术的原理、特点和应用,从几种典型激光熔覆成形系统、成形零件组织性能研究、温度场数值模拟、成形过程检测与控制和成形过程残余应力和裂纹产生的原因及对策等方面对激光熔覆成形技术的研究进展进行综述,指出该技术存在的问题,并对其发展方向进行预测和展望.激光熔覆成形技术在硬件系统、工艺研究和熔池检测与控制等方面都取得了可喜的进步,但成形精度和裂纹仍然是该技术领域非常棘手的问题,有待进一步突破. 相似文献
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简要介绍了快速成型技术的机理与特点以及几种典型成型工艺,对激光快速成型技术在汽车零部件研发过程中的快速原型制造、发动机开发试验和快速模具制造等几个方面的具体应用进行了介绍,指出了该方法是降低汽车零部件开发成本和缩短开发周期的有效手段,并提出了下一步的研究方向。 相似文献
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近年来,迅猛发展的3D打印技术为制造技术带来了的一场变革。本文阐述了3D打印技术的基本概念和发展状况,介绍了3D打印设备及其工作原理,给出了选择性激光烧结成形工艺等6种3D打印成型工艺,从飞行器零部件制造、无人机与模型飞机、装备保养维修、太空制造和军事电子5个方面论述了3D打印技术在军事领域的最新应用和发展前景。 相似文献
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分别采用激光直接制造(DLF)技术和选择性激光熔化(SLM)技术对不锈钢材料进行一系列的激光快速成型实验,根据实验结果,对比分析DLF和SLM两种方法在成形机理、成型精度、成型效率、适用场合、成型件的力学性能和组织结构等方面的异同。结果表明,SLM技术的成型精度要优于DLF技术;两者成型件都具有较高的力学性能,均优于普通不锈钢;SLM与DLF成型件组织性能基本相同;如果切片层厚相同,SLM的成型效率高于DLF;DLF主要用于粗加工或零件修复等场合,而SLM可用于精密、复杂零件的制造。 相似文献
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探讨将电子束的加工方法引进到快速成型技术中,用以替代SLS技术中的激光作为加工热源,以此去掉快速成型系统中激光扫描部分的机械传动部分,简化系统装置及控制系统的软件设计。 相似文献
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快速原型制造技术的集成应用方法 总被引:14,自引:0,他引:14
快速原型制造技术在企业新产品开发中具有重要的作用。在介绍几种典型快速原形系统工作原理和应用特点的基础上,指出快速原型、NC加工和机械手加工原型技术集成的必要性并提出建立集成快速原型制造的模型,最后讨论快速原型技术的应用现状和前景。 相似文献
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C. C. Chang M. Y. Lee S. H. Wang 《The International Journal of Advanced Manufacturing Technology》2006,31(1-2):41-49
The orthodontic denture produced by the traditional method is heavily relied on the skill and experience of the technician. Its quality is depended on the accuracy of the technician’s subjective judgment. In addition, the manual process involves many steps that require a long time to complete. Most importantly, it does not preserve any quantitative information for future retrieval.In this paper, a novel device for scanning denture image and reconstructing 3D digital information of teeth models by abrasive computer tomography (ACT) is presented. The orthodontic denture is then to be produced by rapid prototyping (RP) or computer numerical control (CNC) machining methods based on the digital information. A force feedback sculptor (Freeform system, U.S.A.), using 3D touch technology, was applied to modify the teeth profile or features of the denture. It enables the dentist to perform digital manipulation of the denture profile with real-time and interactive operation. Due to its user-friendly human-computer interface, the dentist can directly access the 3-D model without relying on a CAD/CAM technician or denture technician. In this paper, the comparison between traditional manual operation and digital manufacture using RP and CNC machining technology for denture production is summarized.In this paper, a digital denture manufacturing protocol using an economic and harmless computer abrasive teeth profile scanning, computer-aided denture design, 3D touchable feature modification, and numerical denture manufacturing were proposed here. These proposed methods provide solid evidence that digital design and manufacturing technologies may become a new avenue for custom made denture design, analysis, and production in the 21th century. 相似文献
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Rapid tooling technology. Part 1. A comparative study 总被引:1,自引:0,他引:1
C. K. Chua K. H. Hong S. L. Ho 《The International Journal of Advanced Manufacturing Technology》1999,15(8):604-608
Rapid tooling (RT) is the technology that adopts rapid prototyping (RP) techniques and applies them to tool and die making.
Research into RT techniques has shown that it is gaining more importance and is starting to pose a serious threat to conventional
machining. In this paper, several popular RT techniques are discussed and then classified. A comparison is also made on these
techniques based on tool life, tool development time and cost of tool development. 相似文献
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STL模型的分层轮廓数据优化算法 总被引:3,自引:0,他引:3
在快速成形系统中 ,由于STL模型在切片后的截面轮廓数据含有大量的数据冗余点 ,严重影响了插补加工的精度和效率。为此 ,作者提出了一种数据冗余点的联合剔除算法 ,在保证加工精度的条件下 ,以进一步提高加工效率与质量 相似文献
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José Carvalho Ferreira 《The International Journal of Advanced Manufacturing Technology》2006,31(3-4):235-243
By means of computer aided engineering (CAE) is developed an integrate CAD/RP/FEA system to assist reducing the lead-time of die-castings design and upgrade the die-casting manufacturing technology parameters for zinc castings. The rapid die-casting methodology developed integrates: conceptual design; virtual prototyping (VP), rapid prototyping (RP), P-Q2 technique, finite element analysis (FEA) to improve die-casting process and numerical control (NC) to upgrade die-casting manufacturing parameters. Thermal fluid flow and heat transfer modelling are performed to simulate die-casting manufacture technology to predict defects, increase yield and to improve the manufacturing process. An improved die-casting manufacturing process supported via CAD/RP/FEA technologies and NC control are demonstrated through a die-casting case study to manufacture sound zinc die-castings and conclusions are presented. 相似文献
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快速原型技术是一项先进制造技术,简要介绍了快速原型技术的基本原理、工艺方法、加工特点、应用情况以及发展方向。 相似文献