共查询到19条相似文献,搜索用时 218 毫秒
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水导激光微细加工中激光与水束光纤耦合技术 总被引:2,自引:1,他引:1
为了保证水导激光微细加工中会聚激光与水束光纤的耦合效果,建立了高精度的耦合对准系统,提出了新的耦合对准方法,研制了特殊结构的耦合装置。由于激光要经过空气层、玻璃层、水层进入水束光纤,因此根据计算结果,采用特殊方法来确定会聚透镜与水束光纤起始端(喷嘴孔)的距离;研究了激光在水束光纤中发生全反射的最大入射角;通过流体动力学仿真,设计了腔内流场分布均匀的耦合装置,保证了直径0.12mm的水束光纤的高耦合品质;研究了激光能量在水束光纤中的衰减,采用特定波长、脉冲能量的激光和特殊过滤的去离子水来减小激光能量在水束光纤中耦合的损耗率。试验结果表明,能生成导光长度超过100mm的水束光纤;采用该耦合技术能够在0.2mm厚的硅基晶片上以2mm/s速度切割出缝宽0.12mm的均匀窄缝,几乎无裂纹、无热影响区。该耦合技术能够很好满足水导激光微细加工的要求。 相似文献
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一、高速水束切割技术的前景高速水束切割技术是在七十年代初出现的。开始时只是在大理石、玻璃等非金属材料上用作切割直缝等简单作业。经过二十多年的开发,现已发展成为能够切削复杂的三维形状的工艺方法。加工的材料除大理石、玻璃外还包括普通钢、装甲钢板、不锈钢、钛、黄铜、紫铜,以至塑料、陶瓷、三夹板、软木、纸板、蜂巢结构、复合材料等,最大厚度可达100mm。所用工具即高压水束,它永不会变“钝”,各个方向都有切削作用,使用水量不多。加工开始时不需进刀槽、孔,工件上任一点都能开始和结束切削。可加工小半径的内圆角。切削中不会产生热量、切屑、毛刺、烟尘、渣土。工件材料不会受热变形,切缝很狭小,材料利用率高,加工精度可达0.1mm。很多工业都可应用这种新工艺,例如航天、武 相似文献
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孙连栋 《机电产品开发与创新》2006,19(4):172-174
提出了一种用于控制大型薄壁件加工变形的方法—射流法。采用射流法将高压液体沿切削力的敏感方向的反向,射向切削力的作用点(正在加工的部位),可起到浮动支承的作用,能有效地减小因切削力而引起的加工变形。 相似文献
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高压水射流去毛刺技术的特征及应用 总被引:1,自引:0,他引:1
高压水射流去毛刺技术是利用水力喷射所具有的物理作用和切割作用来去除毛刺的一种柔性加工工艺方法。这种工艺去除毛刺能力稳定,生产效率高,易于实现光控、数控或机械手控制。该文全面介绍了高压水射流去毛刺技术的原理、特点、技术要点以及应用情况。 相似文献
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液体射流研磨技术是在水射流加工技术的基础上发展起来的。目前,制约该技术在高精度机械产品加工中广泛应用的主要原因是高压研磨系统的开发制造。介绍了一套前混合磨料液体射流研磨循环系统,分别论述了低压研磨液产生系统、高压液压油产生系统、高压研磨液产生系统等主要部分的作用及相关参数的选择原则。 相似文献
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小电流的高压放电脉冲和大电流的低压放电脉冲以适当的方式复合进行电火花脉冲放电加工,加工过程稳定,且脉冲击穿率与利用率较高,是一种效果较好的电火花脉冲放电加工方法。该文介绍了一种利用可编程定时器件8253和少量逻辑电路器件巧妙地得到高压放电脉冲和低压放电脉冲控制信号,通过功率放大在加工间隙上获得高压放电脉冲与低压放电脉冲进行电火花脉冲放电加工的方法,通过改变程序可以获得高压放电脉冲超前叠加低压放电脉冲或者高压放电脉冲包络低压放电脉冲等复合形式,而且还可以准确地改变复合时间参数。文中分析了方法组成电路和实现原理,具有结构简单的特点,极具实用价值。 相似文献
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介绍了为提高惯性约束聚变(ICF)激光驱动装置的光束质量和输出功率,我国在神光系列激光装置的建设、运行和性能提升方面开展的工作。综述了我国近年来ICF激光装置用光学元器件的重要研究进展。文中涉及了高纯金属铪和磷酸二氢钾(KDP)等原材料的制备和四大主材(钕玻璃、高纯度KDP、熔石英和KDP/高掺氘KDP(KDP/DKDP晶体)的熔炼、加工和生长。描述了元器件的冷加工(针对钕玻璃、白玻璃、KDP晶体)技术和镀膜技术(针对介质膜和化学膜)。最后,给出了针对大口径光学元件工序检及终检开展的多项关键检测技术。文中介绍的关键技术与工艺满足了绝大部分光学元器件的需求,显著提升了光学元器件的研发和生产能力。 相似文献
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Spinning production is a typical continuous manufacturing process characterized by high speed and uncertain dynamics. Each manufacturing unit in spinning production produces various real-time tasks, which may affect production efficiency and yarn quality if not processed in time. This paper presents an edge computing-based method that is different from traditional centralized cloud computation because its decentralization characteristics meet the high-speed and high-response requirements of yarn production. Edge computing nodes, real-time tasks, and edge computing resources are defined. A system model is established, and a real-time task processing method is proposed for the edge computing scenario. Experimental results indicate that the proposed real-time task processing method based on edge computing can effectively solve the delay problem of real-time task processing in spinning cyber-physical systems, save bandwidth, and enhance the security of task transmission. 相似文献
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The process of water jet cutting has advantages over laser beam cutting, especially in the case of temperature-sensitive materials. Together with the foam and cellulose material processing, the processing of composite materials of lightweight structures is becoming more and more important. In order to meet given requirements, these sandwich constructions can have various types of cover layers (defined by e.g., sheet thickness and material) and consist of core materials (differing e.g., in geometry or in structure).
Unlike simple sheets, multilayer structures have greater influence on the cutting result. When the process is planned, the CAD/CAM-systems must take all sheets of the composite material into account in order to avoid manufacturing problems. Due to the great variety of composite materials and desired contours, the necessary knowledge or experience must be efficiently represented. There is no universal system model for all these variations. This paper suggests a fuzzy-logic theory to build up a knowledge base for the water jet cutting of composite materials. The knowledge contained within the fuzzy-logic base proves to be efficient, due to the relatively high speed at which it can be acquired and due to the possibility to apply it to different structures. Development and structure of the necessary linguistic rule base are presented using sinusoidal composite material made of aluminium as an example. The expert system optimized according to the given design parameters determines the optimal cutting speed for the desired cutting contour. 相似文献
Unlike simple sheets, multilayer structures have greater influence on the cutting result. When the process is planned, the CAD/CAM-systems must take all sheets of the composite material into account in order to avoid manufacturing problems. Due to the great variety of composite materials and desired contours, the necessary knowledge or experience must be efficiently represented. There is no universal system model for all these variations. This paper suggests a fuzzy-logic theory to build up a knowledge base for the water jet cutting of composite materials. The knowledge contained within the fuzzy-logic base proves to be efficient, due to the relatively high speed at which it can be acquired and due to the possibility to apply it to different structures. Development and structure of the necessary linguistic rule base are presented using sinusoidal composite material made of aluminium as an example. The expert system optimized according to the given design parameters determines the optimal cutting speed for the desired cutting contour. 相似文献
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考虑用CaF_2材料制作投影光刻物镜可以明显提高其性能指标,本文研究了CaF_2材料加工工艺的全流程,以实现CaF_2材料的全频段高精度加工。首先,利用沥青抛光膜和金刚石微粉使CaF_2元件有较好的面形和表面质量。然后,优化转速、抛光盘移动范围、压力等加工工艺参数,并使用硅溶胶溶液抛光进一步降低CaF_2元件的高频误差,逐渐去除加工中产生的划痕并且获得极小中频误差(Zernike残差)和高频粗糙度。最后,在不改变CaF_2元件高频误差的同时利用离子束加工精修元件面形。对100mm口径氟化钙材料平面进行了加工和测试。结果表明:其Zernike 37项拟合面形误差RMS值可达0.39nm,Zernike残差RMS值为0.43nm,高频粗糙度均值为0.31nm,实现了对CaF_2元件的亚纳米精度加工,为研发高性能深紫外投影光刻物镜奠定了良好基础。 相似文献
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《Machining Science and Technology》2013,17(3):349-360
The process of water jet cutting has advantages over laser beam cutting, especially in the case of temperature‐sensitive materials. Together with the foam and cellulose material processing, the processing of composite materials of lightweight structures is becoming more and more important. In order to meet given requirements, these sandwich constructions can have various types of cover layers (defined by e.g., sheet thickness and material) and consist of core materials (differing e.g., in geometry or in structure). Unlike simple sheets, multilayer structures have greater influence on the cutting result. When the process is planned, the CAD/CAM‐systems must take all sheets of the composite material into account in order to avoid manufacturing problems. Due to the great variety of composite materials and desired contours, the necessary knowledge or experience must be efficiently represented. There is no universal system model for all these variations. This paper suggests a fuzzy‐logic theory to build up a knowledge base for the water jet cutting of composite materials. The knowledge contained within the fuzzy‐logic base proves to be efficient, due to the relatively high speed at which it can be acquired and due to the possibility to apply it to different structures. Development and structure of the necessary linguistic rule base are presented using sinusoidal composite material made of aluminium as an example. The expert system optimized according to the given design parameters determines the optimal cutting speed for the desired cutting contour. 相似文献