快速成型和电弧喷涂相结合的快速制模技术

对快速成型和电弧喷涂相结合的快速制模关键工序进行了实验研究和分析,包括原型零件快速制造、电弧喷涂材料选择、电弧喷涂工艺参数确定等;同时还对这种快速制模方法的优缺点进行了评价。     

快速成形和电弧喷涂相结合的快速制模技术研究

对快速成型和电弧喷涂相结合的快速制模技术的关键工序进行了实验研究。分析，如快速原型零件的制作，电弧喷涂材料的选择。电弧喷涂工艺参数的确定等，同时对这种快速制模方法的优缺点进行了阐述。     

高熔点金属电弧喷涂快速制模工艺研究

综述了电弧喷涂快速制模技术的发展现状,分析了高熔点金属应用于电弧喷涂快速制模中存在的问题。通过实验研究,得出了在母模上铺设随形金属网、辅型喷涂、间隔喷涂和复合喷涂等方法,有效地将高熔点金属用于电弧喷涂快速制模,扩展了电弧喷涂快速模具的应用范围。     

基于FDM和LOM原型的电弧喷涂快速制模技术研究

对电弧喷涂制模的工艺参数优化和喷涂丝材选择进行了试验研究，研究结果证明Zn—Al伪合金是具有优良综合性能的电弧喷涂材料，实例证明了基于FDM和LOM原型的电弧喷涂制模方法，是适合于新产品开发试制的快速经济制模技术。     

电弧喷涂快速制模工艺及喷涂角度对模具性能的影响

电弧喷涂快速制模技术是基于原型的一种制模周期短、成本低、复制性能好的快速制模技术,是一种很有发展前途的快速制模技术。本文通过实验研究探讨了低温电弧喷涂快速制模工艺流程、母模材料、喷涂材料及各种工艺参数的选择,重点研究了喷涂角度对模具性能的影响。实验结果表明,喷涂角度的减小会导致模具致密度和硬度的下降、金属层的孔隙率增大,60°~90°的喷涂角度对性能影响不大,60°以下时,性能下降幅度明显增大。     

7Cr13-Zn复合涂层在快速制模中的应用

7Cr13_Zn复合涂层具有强度高和硬度高、收缩率小等优点,是一种适合于电弧喷涂快速制模技术的喷涂层,通过正交试验,分析了电弧喷涂工艺参数对涂层强度、空隙率、耐磨性等指标的影响,得到了最优参数组合,根据该组合成功地将7Cr13_Zn复合涂层应用到快速制模中,改善了电弧喷涂模具的性能。     

电弧喷涂成型的快速制模技术

通过金属电弧喷涂成型快速制模技术在汽车覆盖件模具上的应用,论述了低熔点金属电弧喷涂模具制作的关键技术.     

电弧喷涂技术在快速模具中的应用

通过实例介绍了电弧喷涂快速模具制造的工艺流程,阐述了制模过程中的工作原理,对实验设备的选用、喷涂材料和喷涂参数的合理选择作了详细的分析,论述了低熔点金属电弧喷涂快速模具制造,具有工艺简单,制作周期短,模具成本低,精度高等优点.     

电弧喷涂技术在快速模具中的应用

通过实例介绍了电弧喷涂快速模具制造的工艺流程,阐述了制模过程中的工作原理,对实验设备的选用、喷涂材料和喷涂参数的合理选择作了详细的分析,论述了低熔点金属电弧喷涂快速模具制造,具有工艺简单,制作周期短,模具成本低,精度高等优点。     

金属电弧喷涂快速制模工艺的研究

金属电弧喷涂快速制模工艺,是近几年发展起来的新技术,在制造业中发挥了越来越重要的作用。通过对其制模工艺的研究,得出了最佳的工艺参数,展望了快速模具制造技术的发展前景。     

电弧喷涂法制作钢基塑料模具初探

基于快速成形的方法制造各类快速模具已成为RP＆M应用的热点问题。介绍了金属喷涂制模法的原理和特点、电弧喷涂快速模具制作的工艺过程、喷涂所用设备和材料,列举了金属喷涂制模法在鞋底模具开发中的应用实例。金属喷涂制模法具有工艺简单,制模周期短,成本低,复型性好等特点,适合于新产品开发和小批量多品种生产。     

面向复杂形状型腔的机器人多轴成型加工

作为一种较成熟的快速制模工艺,机器人熔射快速制造金属模具工艺可广泛应用于家用电器、汽车、航空航天、医学等领域.机器人直接制造陶瓷原型是其中的一个重要工艺环节.本文建立了面向机器人熔射快速制模工艺的工业机器人成型加工系统,开发了面向复杂形状陶瓷原型的机器人多轴成型加工工艺.利用UG多轴铣加工模块的基本功能,采用辅助平面法来生成机器人的多轴铣削加工轨迹,能够灵活加工通常只有多轴数控机床才能加工的复杂模具型腔.实验结果表明,该工艺不仅提高了机器人的成型加工能力,还扩大了机器人熔射快速制模工艺的应用加工范围.     

Evaluation of three dual-wire electric arc- sprayed coatings: Industrial note

Plasma-sprayed coatings of Ni-18.5Cr-6Al, molybdenum, and A1-12Si are used in selected applica-tions for dimensional restoration of jet engine hardware. These coatings are usually limited, how-ever, by the thickness to which they can be applied. In order to increase the coating thickness capability of these materials, the dual-wire electric arc process was investigated. This paper presents the results of a testing program to characterize the bond strengths, microstructure, hardness, and surface roughness of these three types of materials using a standard dual-wire electric arc spray sys-tem and a high-velocity (arc jet) spray gun. A comparison of bond strengths and microstructure to typical equivalent (in composition) plasma spray coatings was also made. The test program was de-signed to emulate, as closely as possible, substrate materials, spray application procedures, and coat-ing thicknesses that would be used in service.     

Mechanical and thermomechanical properties of metal spray invar for composite forming tooling

The subject of this paper is the assessment of the thermal and mechanical properties of Invar steel coatings, deposited using electric arc spraying, and the correlation of these properties to the spray parameters and processes used to offer coatings with characteristics appropriate to the requirements of tools used in the fabrication of precision polymer matrix composite work pieces. In particular, two processing methods, inert and air atomization, and three arc spray gun configurations (air cap design) were evaluated. The low coefficient of thermal expansion (CTE) properties of Invar are maintained in the spray-deposited coatings using both high velocity oxy-fuel (HVOF) and air-atomized arc spraying, although HVOF coatings have significantly lower CTE and greater durability than those deposited by arc spraying. The mechanical properties of the coatings are low compared to bulk Invar, regardless of the spray parameters and hardware used. Inert arc spraying affords more consistent coating characteristics but this comes with a compromised durability. The spray hardware was found to be more significant in determining the coating properties than the parameters employed.     

金属电弧喷涂成型快速制模关键技术与应用

金属电弧喷涂成型制模技术是一种基于"复制"的制模工艺,与传统制模工艺相比,具有制模速度快、周期短、成本低等特点。金属喷涂模具由金属型壳、背衬强化层以及模框等构成,是一种具有梯度材料结构的复合材料模具。关键制模工艺包括:母模制备、金属型壳制造、模框制作、背衬强化层制作、脱模以及后处理等。金属喷涂制模技术可用于制造注塑模具、热成型模具和板料冲压模具等。该文以大型汽车覆盖件模具的快速制造为例进行了详细介绍。     

大面积防腐施工中电弧喷涂工艺优化

为保证在大面积防腐施工中超音速电弧喷涂铝涂层质量的稳定性,用正交试验方法对喷铝工艺参数进行了优化设计,优化后的工艺参数为:喷砂角度为45°,喷涂电流150A,喷涂电压34 V,空气压力0.7MPa,喷涂距离150mm.在此条件下得到的涂层结合强度为25MPa,比一般的电弧喷涂层结合强度提高了48%.     

用快速成形技术制造玻璃模具电火花加工电极

本文叙述了用快速成形技术制造玻璃模具电火花加工电极.对客户提供的玻璃器皿样品尺寸进行三坐标测量,并将样品的尺寸放大1 mm以补偿样品生产时的收缩.利用快速成形技术对样品进行三雏造型,并制得样品的树脂原型.利用熔模铸造技术和树脂原型来制作模具电火花加工的电极.用这种工艺可以快速得到铜电极,实现玻璃模具的快速加工.     

双丝电弧喷涂中粒子交叉飞行行为的在线测量及分析

采用两根具有不同熔点的材料分别作为双丝电弧喷涂的阳极和阴极丝材,采用SprayWatch-2i热喷涂监测系统,通过对融熔粒子飞行中温度的在线测量分析,直接验证了粒子的＂交叉飞行＂现象.利用能谱仪（EDS）定量研究了两极的材料和氧化物在喷涂沉积丘中的分布,并分析了这些分布特征在不同喷涂距离上的变化规律,结果发现,沿喷涂丘的横截面,来自阴极和阳极的扁平化粒子以接近反对称的方式分布.在所测量的两个喷涂距离上,各种成分（包括氧化物）的含量随喷涂距离变化不大.而且电弧喷涂涂层中具有约10 %左右的氧化物含量.     

Influence of the spray velocity on arc-sprayed coating structures

Thermal spray processes such as plasma spraying and HVOF have gained markets due to a steady process of development of materials and equipment. One disadvantage of thermal spray processes is that costs must be competitive compared to techniques such as PTA and electroplating. In order to reduce costs, the more economical spray processes like conventional wire flame spraying, as well as arc spraying, are becoming more popular. There are modern arc spray gun designs on the market that meet the requirements of modern coating properties, for example aviation overhaul applications as well as the processing of cored wires. Nevertheless, the physical basis of arc spraying is well known. The aim of the present investigation is to show how the influence of spray velocity (not particle velocity) affects coating structure with respect to arc spray parameters.     

Droplet transition for plasma-MIG welding on aluminium alloys

The synchronous acquisition system of droplet image inspection and arc electric signals were established and the droplet transition characteristics of aluminum alloys were researched in the plasma-MIG welding process.Typical droplet transition modes include globular transfer mode,short circuiting transfer mode,metastable spray transfer mode and projected transfer mode.The result indicates that MIG droplet transfer frequency and droplet transfer modes are changed by introducing the plasma arc in the plasma-MIG welding process compared with the MIG welding on the aluminum alloys,which broadens the range of welding parameters when the stable welding process proceeds.The metastable spray transfer and projected transfer mode are proved to be the most optimal modes by comparing the stability of electronic signal,droplet transition,weld appearance and weld penetration.