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型砂水分红外光谱在线检测方法的探讨 总被引:1,自引:0,他引:1
在讨论了各种型砂水分检测方法的基础上,提出了型砂水分光谱检测方法,介绍了这种方法的基本原理,设计了检测仪器,并对这种方法用于型砂水分在线检测进行了初步探讨。 相似文献
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TLP连接技术研究进展 总被引:10,自引:1,他引:9
TLP连接方法是一种常用于难焊金属,尤其是复合材料和导种材料的重要连接方法,自上世纪50年以来,在Ni基,Co基耐热合金,Ti合金,半导体材料,复合材料,复合材料以及异种材料的连接中得到了大量的应用,70年代以来,众多的研究者对TLP连接机理进行了大量的研究工作,取得了很大的成就,重点从TLP连接方法的发展入手,比较系统地总结了研究TLP连接过程动力学的各种方法,研究结果为TLP连接方法的研究和应用提供了重要的理论基础。 相似文献
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作者在数字积分插补方法的基础上,发展一种多坐标的完全软件插补方法-多维直线插补方法。该方法具有精度高,适用性强和易于实现等特点,可望得到广泛应用,本文对该方法的基本原理及实现方法进行了简单的介绍,并给出了应用实例。 相似文献
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Suspension and solution thermal spray coatings 总被引:3,自引:0,他引:3
Lech Pawlowski 《Surface & coatings technology》2009,203(19):2807-2829
The emerging methods of coating deposition by suspension and solution thermal spraying are described. The liquid suspensions of fine powders and liquid precursors are injected into flames and/or jets generated in the torches. The formulation and stability of suspensions as well as the methods of fine powders synthesis are briefly described. Typical solutions, being often the liquid organo-metallics are also briefly described. An important problem of injection of liquids into jets and flames is then presented. Two principal modes of injection, used at present, are outlined, i.e.: (i) atomization; and, (ii) injection of a continuous jet. Subsequently, the phenomena occurring in flames and plasma jets are discussed and the major differences to these occurring during conventional spraying are stressed up. The build up of coatings starting from the impact of fine particles on the substrate is described and typical microstructures of suspension and solution sprayed coatings are shown. Some properties of the sprayed coatings, including mechanical, electrical, chemical, and thermophysical ones are collected and presented. Finally, the emerging applications of coatings are shown and the possible future applications are discussed. 相似文献
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Modular fixtures are distinguished for their high flexibility. Previous researches focused on 2-D objects or 3-D objects with regular geometry. This paper introduces our systematic study of 3-D modular fixtures, particularly for complex objects. For the sake of both function and simplicity, three baseplates are arranged equilaterally. One baseplate is fixed horizontally, on which three fixels are installed to support the object. The other baseplates are moveable and at least one fixel is set on either of them. Totally, seven fixels are adopted. Efficient algorithms are presented for computing optimal fixel locations for the given object pose regarding localization accuracy and immobilization capability. On account of the manufacturing errors, measuring and adjusting techniques are developed to improve the localization accuracy. Case studies are investigated to illustrate applications. Experiments are performed for verifying the principles, including the well-known theoretical proposition that seven fixels are necessary and sufficient for fixturing a 3-D object of nonrevolutionary surface. 相似文献
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介绍了熔体片冲孔模结构及主要零件的设计,设计了符合冲压工艺的多品种模具结构,分析了模具关键零件的设计和制造,并考虑了模具的镶拼结构及模具中使用反推杆结构,保证了细小凸模的刚度不受影响,提高了整副模具的使用寿命,同时设计了送进和取出熔体片的工位器具,获得了满意的使用效果。 相似文献
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The tensile rupture locations of friction stir welded joints of AA2017-T351 and AA6061-T6 aluminum alloys were examined. The experiments show that the rupture locations of the joints are different for the two aluminum alloys, which are influenced by the welding parameters. When the joints are free of welding defects, the AA2017-T351 joints are ruptured in the weld nugget adjacent to the thermo-mechanically affected zone on the advancing side and the rupture surfaces appear as oval contours of the weld nugget, while the AA6061-T6 joints are ruptured in the heat affected zone on the retreating side and the rupture surfaces are inclined at a certain degree to the bottom surfaces of the joints. When welding defects are present in the joints, the AA2017-T351 joints are ruptured in the weld center, while the AA6061-T6 joints are ruptured on the retreating side near the weld center. The rupture locations of the joints are dependent on the internal structures of the joints and can be explained through them. 相似文献
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超声电镀锡铋合金研究 总被引:5,自引:0,他引:5
研究了超声波对锡铋合金电镀的影响.通过赫尔槽试验优选出最佳镀液配方和工艺条件,用SEM法观测了镀层形貌,并测试了镀层和镀液性能.结果表明:超声波的作用扩大了电流密度范围和温度范围;所得镀层表面光亮、结晶更细致、均匀,镀层结合力、抗氧化性和可焊性改善明显,耐蚀性增强;镀液性能稳定,阴极电流效率和沉积速度得到提高.因此,超声波对电镀工艺条件、镀层质量和镀液性能都有明显的改善作用. 相似文献
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So-called oxide dispersion strengthened steels or nanostructured ferritic alloys (NFAs) contain nanoprecipitates which give them exceptional mechanical properties and resistance to radiation effects. However, the structure and composition of these nanoprecipitates are still uncertain. To help clarify the nature of the smallest nanoprecipitates, density functional theory calculations are used to investigate the most stable Ti, Y, and O nanocluster computational units in Fe. Two distinct methods for searching for stable nanoclusters are proposed: one in which nanoclusters are restricted to the body-centered cubic Fe lattice and one in which the nanocluster structures are strained variants of bulk Ti and Y oxides. We discovered that nanoclusters that are structurally similar to bulk Ti and Y oxides are significantly more stable than nanoclusters that are restricted to the Fe lattice. Consequently, the most stable nanoprecipitates in Ti-Y-O NFAs are more likely to be small oxide phases than coherent solute-enriched clusters. 相似文献