导向筒挤压成形工艺及模具设计

探讨了导向筒挤压的可行性,对几种工艺方案进行了分析,选择了最优方案并制定了工艺流程,在此基础上设计了导向筒挤压模具。采用冷挤压工艺加工后,提高了零件精度和表面质量,改善了强度和韧性,减少了切削加工量,节约了原材料,提高了生产效率,也改善了零件的组织性能。     

冷床上卸钢液压系统分析改造

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。     

带内螺纹的望远镜镜身注塑模具设计

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。     

40MnB轴头锻后余温热处理的工艺研究

对锻后40MnB轴头毛坯进行了工艺试验,提出了锻后余温热处理的工艺方案。结果表明,经锻后余温处理改善了40MnB的内部组织结构,细化了晶粒,提高了力学性能,质量得到保证,同时提高了生产效率,缩短了生产周期,降低了成本。     

电脑机箱挡板级进模设计

分析了电脑机箱挡板的结构特点,设计了少废料排样,提高了材料利用率。应用了独特的切舌定距方案,满足了制件尺寸精度要求,简化了定位装置结构。模具结构设计简单、合理、可行,降低了模具成本、缩短了模具制造周期。     

隐身罩拉深模设计

分析了隐身罩零件的结构和工艺特点,改变了组焊式的制造方法,有针对性地制定了模具设计制造工艺方案,简化了设计结构,并以DYNAFORM软件进行了设计计算及模拟。结果表明,提高了模具设计制造效率及准确性,满足了批量生产,且提高了外观质量。     

计数器齿轮冷模锻工艺及模具设计

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。     

基于工艺补充面优化设计的汽车前门外板拉深成形研究

针对表面形状复杂的汽车前门外板进行了冲压缺陷分析并提出了解决方案。分析了制件变形和棱线滑移产生的原因。构造了较产品设计有一定局部偏差的工艺造型,形成了适用于拉深工序的模具型面。对工艺补充面进行了再设计,通过设置工艺凸包和凹陷补偿的方法,解决了门把手安装槽转角的变形问题。利用强压处理调节局部材料流动,并优化了传统的强压区范围,最终有效控制了滑移线。建立了有限元模型,对设计方案进行了模拟验证,制造出了合格的拉深制件。     

保压阀支架级进模无废料排样设计

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。     

抓住关键缩短模具开发周期

分析了模具及其生产的特点，介绍了实施项目负责制与并行工程的经验，论述了模块化模具设计的特点和难点并提出了相应解决方法，开发了智能模块化模具CAD系统并在配件公司中成功应用，验证了本文提出了方法的有效性。     

A 3-D modular fixture with enhanced localization accuracy and immobilization capability

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.     

镁合金抗氧化及合金化阻燃研究进展

综述了镁合金氧化燃烧及燃点的测定方法、镁合金抗氧化和阻燃机理及合金元素(Ca，Be，RE，Y)对镁合金阻燃性能影响的研究现状。介绍了抗氧化和阻燃镁合金研制进展及应用现状，指出了研究中存在的问题及发展方向。     

Suspension and solution thermal spray coatings

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.     

Rupture locations of friction stir welded joints of AA2017-T351 and AA6061-T6 aluminum alloys

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.     

凝胶注模成型技术的研究与进展

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。     

平板类气体辅助注射成型产品的CAE模拟研究

通过建立具有代表性的平板类气体辅助注射成型产品模型,借助注塑成型CAE软件Moldflow对该模型进行了一系列分析模拟。通过对模拟结果数据的综合分析和数学处理,得到了气体注射参数对气道穿透长度的影响规律、气体注射参数设置及气道穿透长度预测公式。     

固体渗硼提高热锻模寿命的研究

对５ＣｒＮｉＭｏ式样进行了固体渗硼热处理工艺试验、组织观察与力学性能测定,确定了提高５ＣｒＮｉＭｏ钢制热锻模服股寿命的固体渗硼热处理工艺,并用于实际生产。     

超声电镀锡铋合金研究

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.     

钢结硬质合金材料的研究进展

介绍了钢结硬质合金的性能特点及制备工艺,简述了近年来在钢结硬质合金领域开展的研究与取得的进展,对钢结硬质合金的应用进行了分类归纳,展望了其发展前景。     

银带熔体片多品种冲孔模设计

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。