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本文对冷床上卸钢液压系统存在的问题进行了分析,找出了产生问题的原因,并对原液压系统进行了改造,减少了油液的泄漏,提高了系统的稳定性,减小了维修强度,降低了维修成本,提高了系统的工作效率。 相似文献
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分析了望远镜镜身的结构,提出了塑件成型及模具设计的关键点,设计了模具的整体结构。设计了可相对运动的组合式型芯,以增加内抽芯机构的运动空间,通过塑件推出时带动螺纹滑块的移动实现了内侧抽芯。设计了矩形型芯镶块、加工了避空结构,采用螺钉固定,解决了狭小空间安装小型芯的问题,避免了模具干涉。采用了锥面配合,提高了模具的定位精度,减小了配合件的摩擦。经生产验证,该模具生产的塑件质量满足图纸要求。 相似文献
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STEP-NC是STEP向数控领域的扩展.STEP-NC使CNC与其它CAX系统之间实现了信息的双向流通,丰富了数控程序的信息含量,提高了CNC的智能化水平.文章利用Visual C 编程语言及OpenGL图形库实现了一个基于STEP-NC的数控铣削仿真系统,构建了基于STEP-NC的软件,规划了其体系结构,论述了STEP-NC类库的设计过程.随后,给出了系统各功能模块的实施细节,分析了各模块实现的关键技术,着重介绍了系统各功能模块的设计与实现,并给出了程序算法及相关流程图.验证了STEP-NC数据模型的可行性. 相似文献
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为加大拖拉机导向轮合件的生产规模, 开发研制了一台自动焊专机, 实现了拖拉机导向轮合件的全自动焊接, 提高了劳动生产率, 满足了规模生产的需求; 还实现了该零件的自动焊接工艺参数的一元化控制, 减小了人为因素对产品质量的影响, 保证了产品的质量, 减轻了工人的劳动强度, 降低了生产成本。 相似文献
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分析了计数器齿轮的冷模锻工艺,设计了冷模锻件图,计算及选用了毛坯尺寸及形状,验算了许可变形程度,选择了变形用的设备,拟制了冷模锻前的毛坯处理及设计了冷模锻模具结构。 相似文献
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分析了保压阀支架的冲压工艺,设计了零件的排样方案,介绍了模具结构。不仅保证了零件的精度,同时提高了生产率,大幅降低了生产成本。 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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Yu. A. Puchkov V. A. Larkin S. H. Nguen O. V. Sedov 《Metal Science and Heat Treatment》2004,46(11-12):521-526
Dies produced from castable and deformable aluminum alloys are studied. The dies are used for molding articles from foaming plastics. Specimens for studying the microstructure are cut from the surface zone of dies. The stress state of the dies is determined by computation. The chemical composition of water and deposits on the surface of dies are studied in order to determine the causes of corrosion cracking. The effect of the composition of the alloy and of water on the composition of corrosion products deposited on die surfaces is studied by means of thermodynamic computation with the help of TERRA software. The materials of dies and alloys suitable for their production are studied and corrosion tests under actual operating conditions are performed. Anodized, epoxy, and epoxy-phenol coatings for the dies are tested. The causes of failure of aluminum dies are analyzed and recommendations for raising their endurance are given. 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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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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Robert D. Shull 《Journal of Phase Equilibria》1983,4(1):5-15
The procedures by which samples are prepared for phase diagram studies are examined and critically evaluated. The three key elements that require attention (alloy purity, homogeneity, and equilibrium) are separately addressed, and several examples of bad procedure are presented with information on their past and future consequences. The origin of commonly confronted problems are described and special procedures are suggested for their circumvention. Additionally, new methods for the early detection of some sample problems are presented, and the usefulness of rapidly solidified materials (as specimens) in phase diagram studies is illustrated. 相似文献
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Abba A. Abubakar Abul Fazal M. Arif Khaled S. Al-Athel S. Sohail Akhtar Javad Mostaghimi 《Journal of Thermal Spray Technology》2017,26(6):1115-1145
An overview of analytical and numerical methods for prediction of residual stresses in thermal spray coatings is presented. The various sources and mechanisms underlying residual stress development in thermal spray coatings are discussed, then the various difficulties associated with experimental residual stress measurement in thermal spray coatings are highlighted. The various analytical and numerical models used for prediction of residual stresses in thermal spray coatings are thoroughly discussed. While analytical models for prediction of postdeposition thermal mismatch stresses are fully developed, analytical quenching and peening stress models still require extensive development. Various schemes for prediction of residual stresses using the finite element method are identified. The results of the various numerical and analytical models are critically analyzed, and their accuracy and validity, when compared with experiments, are discussed. Issues regarding the accuracy and applicability of the models for predicting residual stresses in thermal spray coatings are highlighted, and several suggestions for future development of the models are given. 相似文献
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凝胶注模成型技术的研究与进展 总被引:3,自引:0,他引:3
对凝胶注模成型技术的研究与进展情况进行综述。阐述成型原理和工艺过程;总结凝胶体系,并根据凝胶体系的来源将其分为合成凝胶体系和天然凝胶体系两类;介绍该技术在粗颗粒粉体材料、复合材料、多孔材料、功能材料和粉末冶金等领域的应用研究情况;探讨凝胶注模成型技术存在的问题和研究发展方向。 相似文献
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A. Yu. Tsivadze L. A. Nosikova Z. A. Kudryashova 《Protection of Metals and Physical Chemistry of Surfaces》2012,48(2):135-157
Structural peculiarities of mesogenic phthalocyanines and their derivatives are considered. Liquid-crystalline materials based
on self-assembled phthalocyanine molecules are promising novel functional materials for sensors, as catalysts, optically and
bioactive matrices, and semiconductor cells. Mesomorphic and electrophysical characteristics of liquid-crystalline phthalocyanine-based
materials are considered, possibilities of their use are discussed, and the structure-property relations are analyzed. 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