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直流高压发生器的三个基本参数是直流输出电压U_(av)、直流输出电流I_(av)和电压脉动系数K_δ,因此电压脉动系数的测量也相当重要。采用本线路对300KV直流高压发生器进行了脉动系数的测量,获得了较满意的结果。 相似文献
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Plasma spray forming shows overwhelming advantages in rapid fabricating parts and moulds. The coating microstructure is strongly dependent on the splat morphology and inter-splat contact nature. Therefore, it is necessary to investigate the splat formation mechanism in order to analyze the coating properties. A dynamical process of a single fully molten droplet impacting onto a smooth surface was investigated. At the same time, the interaction between the two molten droplets in the horizontal and vertical directions was also simulated. Finally, the simulations of impact of a molten droplet on an inclined plane and a sharp edge were presented. It is concluded that the relative distance of the two droplets strongly influences the dynamics of the two droplets interaction. The various surface conditions have direct effects on the dynamics of splat formation. When a droplet impacts onto an inclined surface and a sharp edge, the splat morphology changes obviously and the phenomenon of break up is observed. 相似文献
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数控火焰切割机切割细长料,由于料较长、较窄,热影响区集中,往往变形较大,零件切割后形成镰刀弯,无法保证下料尺寸。笔者通过多年的生产实践积累了DHG.CNC—4000数控火焰切割机切割细长料的经验,现介绍如下。 一、汽车纵梁翼板、腹板 1.切割方案(图1所示)图1 汽车纵梁翼板、腹板虽然数控火焰切割机上有一组固定式三割炬,但由于每个割炬火焰调整的强弱不能完全一致,割嘴清洁度不能完全相同,钢板杂质分布不均匀等因素,切割热变形往往不一样,且三割炬无法根据钢板热变形分别调整割炬的高度,所以三割炬使用… 相似文献
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涂辊是纺织机械关键部件,上面有高密度网络分布的细小孔,其圆周分布共360排,每排400个直径为1.3mm、深度为3mm的小通孔,共有14.4万个,工件工作长度为1m,直径为0.22m。它的应用,意味着加工工艺也要与之匹配。传统的加工方法无论从加工精度、生产率,还是从劳动强度及生产成本上都难以实现,因此传统的加工工艺已无法满足其加工要求。电火花成型加工具有工序比较集中、加工精度较高等优点,除了能很好地解决难加工材料成型工艺问题,还具有机床运动轨迹简单、能一次安装加工出复杂表面。本文分析涂辊的加工特点,应用电火花加工技术,采用群电极方法对涂辊小孔进行加工,圆满地解决了工程实际难题,实现了涂辊国产化。 相似文献
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