一种高效低成本快速成型方法的研究

快速成型技术(RP)采用材料累加法制造零件，它可实现从CAD模型到三维实体的直接制造，从而大大缩短了产品的研制开发周期，可以说此项技术是制造业的一次重大进步，但目前的快速成型设备大多价格昂贵，设备运行费用较高，限制了此项技术的推广应用。因此如何开发出低成本的快速成型设备就成了目前研究的焦点。     

基于超声波焊接技术的快速成型方法研究

提出了一种新的基于超声波焊接技术的快速成型方法.它是采用薄片材料,如金属、塑料片材或带材等,进行逐层加工,先采用超声波焊接,层层之间的结合实现固体连接,每一层焊接完成后,根据CAD数据信息,驱动刀具进行平面加工,然后再堆积加工成形新层,直至完成零件与模具的制造,实现了一种新的精密高效低成本加工与成形技术.使用鱼骨图分析了影响成型件产品质量的各种因素.     

RPM与特种加工组合的快速模具制造

概括介绍了快速原型制造(RPM)技术的特点及其发展现状，重点介绍了基于RPM的直接快速制模法以及RPM与电铸、金属喷涂、浇注、精密铸造和成型电极加工等特种加工方法组合的间接快速制模法，概述了快速模具制造技术的研究和发展概况。     

陶瓷型精密铸造法制造金属模具的探索

在机械制造中模具是重要的工艺装备;针对模具的特点,探索运用快速制造技术生产树脂原型作为铸造模样,使用陶瓷型铸造技术生产金属模具。通过实例验证了该方法是可行的,具有很好的工业应用价值。     

快速模具制造技术分析与发展趋势

介绍了直接法和间接法快速模具制造技术,分析了快速模具制造技术的发展趋势和市场需求,指出应加快快速制模技术在我国的研究和应用,满足产品创新和快速制造的市场需求。     

一种高效率的精密模具加工用新型电极丝

分析了精密模具加工用电极丝结构及实际电加工过程中容易出现的问题,对精密模具加工用电极丝成分和结构特点做出了改进,使电极丝的性能更优化,提高了电加工的效率.     

基于快速成型技术的快速模具制造

分析了基于快速成型技术的快速模具制造技术及其工艺过程,阐述了快速模具制造技术的发展趋势.     

精密焊接加工

<正>精密焊接适用于包括环缝自动导轨焊接和激光焊接在内的各种精密焊接工艺。精密焊接可用于焊接直径为0.012″,壁厚0.001″的小型管。几乎所有的金属都可以采用精密焊接的方法,包括钛合金和镍基合金。精密焊接技术广泛应用于航天和能源领域。     

叶轮发泡模具电火花加工电极的快速精密铸造

利用快速成型技术和复合陶瓷型壳技术制备叶轮发泡模具电火花加工电极的精密铸造型壳,实现了电极的快速精密铸造。实践表明,使用该工艺铸造的电极具有尺寸精度高、表面光洁度好的特点,可满足模具电火花加工的使用要求。     

精密殷钢模具加工工艺

讨论了研制高精度碳纤维复合材料天线副反射器采用低膨胀合金 (殷钢 )模具材料的必要性。通过对模具结构分析 ,在制定合理的工艺规程基础上 ,解决了模具制造过程中殷钢材料切削加工和热处理工艺等技术难题。研制出的碳纤维复合材料天线副反射器模具表面精度达0.028mm。     

快速成形技术在快速模具制造中的应用

快速成形技术是20世纪80年代发展起来的一种集计算机辅助设计、精密机械、数控、激光技术和材料科学为一体的全新制造技术.由于其高度柔性和快速性,得到了广泛的研究和应用.以快速成形为技术支撑的快速模具制造作为缩短产品开发时间及模具制作周期的先进制造技术已成为当前的重要研究课题和制造业核心技术之一.本文介绍了立体光刻技术、薄材叠层成形、选区激光粉末烧结、熔融沉积成形等快速成形典型工艺方法,阐述了用快速成形技术直接、间接制造金属模具和非金属模具的原理、工艺和研究现状,并对快速成形技术在模具制造中的应用前景作了展望.     

Rapid prototyping of extrusion dies using layer-based techniques

Extrusion die design and development often requires significant craftsman skill and iterative improvement to arrive at a production-ready die geometry. Constructing the dies used during this iterative process from layers, rather than from one solid block of material, offers unique opportunities to improve die development efficiency when coupled with concepts drawn from the rapid prototyping field. This article presents a proof-of-concept illustrating the potential utility of layer-based extrusion dies for the die design and fabrication process. The major benefits include greater flexibility in the design process, a more efficient, automated fabrication technique, and a means for performing localized die modifications and repairs.     

铝合金MIG焊快速成形问题及计算机分析

基于熔化极惰性气体保护焊快速成形技术,引入激光热源,提出激光-TIG复合热源快速成形技术,并采用该技术制作铝合金墙体零件。结果表明:相比常规M IG焊,激光-MIG复合焊过程中电弧在激光的作用下,其作用范围减小,作用精度提高,稳定性增强,提高了零件表面质量和精度。     

基于焊接的快速成形技术

近年来，快速成形技术（如SLA、LOM、FDM等）得到了快速的发展，基于焊接的快速成形技术因能获得组织致密的金属零件，从而得到工业界的广泛关注。回顾了当前基于焊接的快速成形技术的研究进展，介绍了与之相关的CAD模型切片算法、路径规划策略以及焊接方法、焊接工艺参数、成形过程监控等的发展状况及其对成形效果的影响；并对以后熔焊快速成形技术的研究方向做了预测。     

快速成形技术在铸造模具制造中的应用

介绍了各种快速成形技术的工艺原理,详细分析了快速成形技术在铸造模(如木模、蜡模、消失模、覆膜砂型(芯)、陶瓷型壳、铸造金属模等)制造过程中的具体应用,讨论了快速成形技术的发展方向。     

TIG焊快速制造神经网络焊接参数控制器

介绍了TIG焊快速制造系统,分析并得出了影响快速制造的主要焊接参数.通过大量TIG焊快速制造试验,得出了焊接参数的控制方案,并提出了一种基于BP神经网络的预测焊接参数的方法.设计并制作了基于继电器的焊接参数控制器的接口电路及相应电脑控制软件,将控制器用于TIG焊快速制造试验,得到了比较理想的试验效果,并有效减少了试验中的事故.     

三维焊接快速成形技术的研究现状及发展趋势

基于三维焊接的直接金属快速成形技术发展至今,以焊接工艺为技术依托,直接成形金属材料零件已成为三维焊接快速成形技术新的研究热点。总结了快速成形技术的国内外研究现状,阐述了该技术目前所存在的问题,以及提出了该技术目前仍然有待提高的方面以及在以后的研究过程中所需解决的问题。     

Modeling of welded bead profile for rapid prototyping by robotic MAG welding

As a deposition technology, robotic metal active gas(MAG) welding has shown new promise for rapid prototyping (RP) of metallic parts. During the process of metal forming using robotic MAG welding, sectional profile of single-pass welded bead is critical to formed accuracy and quality of metal pans. In this paper, the experiments of single-pass welded bead for rapid prototyping using robotic MAG welding were carried out. The effect of some edge detectors on the cross-sectional edge of welded bead was discussed and curve fitting was applied using leat square fitting. Consequently, the mathematical model of welded bead profile was developed. The experimental results show that good shape could be obtained under suitable welding parameters. Canny operawr is suitable to edge detection of welded bead profile, and the mathematical model of welded bead profile developed is approximately parabola.     

A low cost cutter-based paper lamination rapid prototyping system

Paper lamination rapid prototyping technology has an advantage of its low overall cost due to the building materials and the processing principle. To reduce the system and its operating cost further, a cutter-based paper lamination rapid prototyping system is proposed. The cutter set employed is cheap and the cutter can turn its cutting direction automatically so as to simplify the system control. In this paper, the cutting mechanism of the cutter was studied. According to its kinetic characteristics, the motion of the cutter nose was described by a tractrix model, and its trace error can be eliminated by modifying the cutter path. Experimental study on the cutting notch was carried out, and the notch specimens were measured through a high-power microscope VH-8000. According to the analysis of the experimental results, the dimension error caused by the cutting notch was within 3 μm and the roughness average (Ra) was less than 6 μm. Two physical parts have been fabricated on the developed experimental machine, which indicates the proposed system has use value.     

Effects of processing parameters on figuration during the GMAW rapid prototyping process

As a deposition technology, gas metal arc welding （GMAW） has shown new promise for rapid prototyping of metallic parts. During the process of metal forming using the arc of GMA W, low heat input and stable droplet transition are critical to high quality figuration. The effects of various processing parameters on figuration quality were studied in the experiment of GMA W rapid prototyping using the wire of ERSO-6 , including welding voltage, wire feeding rate, welding speed and so on. The optimal parameters for ERSO-6 are obtained. Simultaneously, it is verified that the rapid prototyping parts with favorable structures and quality can be achieved under the conditions of low heat input and stable droplet transition.