共查询到19条相似文献,搜索用时 46 毫秒
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电铸技术的发展及应用 总被引:11,自引:0,他引:11
通过阐述电铸的基本原理,分析了电源、电解液和阳极材料等电铸要素对电铸技术发展的影响,并结合电铸的自身优点介绍了电铸技术的应用情况,在正确面对并处理好电铸技术存在的不足的情况下,电铸作为一门交叉学科的技术仍具有广阔的发展空间和应用前景。 相似文献
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选择性激光烧结的翘曲变形与扫描方式的研究 总被引:2,自引:0,他引:2
在研究选择性激光烧结工艺(Selective Laser Sintcfing,简称SLS)成形误差的基础上,分析造成SLS成形件翘曲的原因,构建了一种新的翘曲变形模型.并以此模型作为基础,提出一种新的光栅扫描方式.通过试验验证,此扫描方式可以有效地降低SLS成形件的翘曲变形,提SLS成形件精度. 相似文献
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SLS快速成形系统扫描路径优化方法的研究 总被引:4,自引:0,他引:4
从成形速度入手,通过对选择性激光烧结技术(Selective Laser Sintering)中现有的最普遍的两种扫描路径进行分析和比较,并考虑到不同扫描系统的特殊性,提出了对扫描路径进行优化的方法。从而能在保证制件成表精度的条件下提高成形速度,节约烧结成本。 相似文献
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描述了激光选择性烧结金属粉末快速成形设备的粉末供给和铺平压实系统及动作,探讨了烧结过程参数对烧结质量的影响,粘结剂含量、孔隙率和缺陷尺寸与烧结件压缩强度之间的关系,并指出影响激光选择性烧结的重要因素是烧结粉末的特性、激光参数的设置等。 相似文献
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分析了SLS直接熔融低熔点性粉末材料成型时的控温机理,将整个逐层加工过程的控温工艺分为一般层控温和关键层控温.提出了一种基于线段求差的实体截面求差的关键层判断方法,以此来判断关键层能够快速、准确、稳定的判断出关键层.实现了SLS系统的自动控温,提高了SLS系统的自动化程度. 相似文献
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The Selective Laser Melting (SLM) process fabricates components from powders by adding material and its processing principle is based on track overlapping regime, which has been studied in this paper. The inter-layer stagger scanning strategy was employed to avoid nonuniform distribution of energy input. By theoretical deduction and experimental observation, three types of overlapping regime were revealed: intra-layer overlapping regime, inter-layer overlapping regime and mixed overlapping regime with coexistence of the first two types. The overlapping patterns and the corresponding microstructures were then discussed. Experimental result showed that specimens fabricated by inter-layer overlapping regime had high relative density when track space was not larger than 0.2 mm. A cooling insert with relative density of about 93% was also obtained at track space of 0.12 mm. 相似文献
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Electroforming of perforated products is done on a conductive substrate (matrix), provided with a nonconducting pattern. Different types of matrices and their manufacture are discussed. The cross-sectional shape of the holes and the relationship between thickness and adjacent perforations and the laws of electroforming governing them are discussed. The manufacture of some typical electroformed products is outlined. 相似文献
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A new electron beam control system was developed in a general vacuum electron beam machine by assembling with industrial control computer, programmable logic control (PLC), deflection coil, data acquisition card, power amplifier, etc. In this control system, scanning track and energy distribution of electron beam could be edited off-line, real-time adjusted and controlled on-line. Ti-Mo gradient material (GM) with high temperature resistant was fabricated using the technology of electron beam melting. The melting processes include three steps, such as preheating, melting, and homogenizing. The results show that the GM prepared by melting technology has fine appearance, and it has good integrated interface with the Ti alloy. Mo and Ti elements are gradually distributed in the inter.face of the gradient material. The microstructure close to the Ti alloy base metal is α + β basket-waver grain, and the microstructure close to the GM is a single phase of β solid solution. 相似文献
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热轧支承辊堆焊技术研究 总被引:1,自引:0,他引:1
针对热轧板厂70Cr3NiMo表面淬火锻钢支承辊进行堆焊修复后使用寿命低的情况,以及国内尚无较为成熟的支承辊堆焊材料的现状,自主研制了PRJ225药芯焊丝,匹配107焊剂,采用合适的堆焊工艺对支承辊进行堆焊.与目前常用的H25Cr3Mo2MnVA焊丝+SJ301焊剂匹配相比,PRJ225焊丝的堆焊层在硬度、耐磨性和裂纹扩展速率方面均优于H25Cr3Mo2MnVA焊丝.从工业试验结果来看,修复后的支承辊不仅耐磨性良好,而且具有较好的耐接触疲劳性能,其平均过钢量达到65万t以上,最高过钢量达到了112.6万t,超过了目前国内其他钢铁公司热轧支承辊堆焊修复后的过钢量,居国内领先水平. 相似文献
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提出通过掺杂SiC颗粒来减小Ni微电铸层内应力的新方法,基于UV-LIGA工艺制作了纯镍电铸层和Ni-SiC复合电铸层,采用X射线衍射法测量微电铸层的内应力,分析SiC颗粒对微电铸层内应力的影响效果。利用L_9(3~4)正交试验考查了铸液中SiC浓度、电流密度、搅拌转速及电铸温度等工艺参数对复合电铸层内应力的影响。结果表明:掺杂SiC颗粒能有效减小微电铸层内应力,电流密度和铸液中SiC浓度对内应力的影响大于搅拌转速和电铸温度。复合电铸层内应力实验的最优工艺参数为:SiC浓度20 g/L,电流密度1 A/dm~2,磁力搅拌转速600 r/min,电铸温度50℃。 相似文献