转子与磁轭及定子无搭边叠铆级进模设计

根据转子转位、磁轭、定子无搭边叠铆冲压工艺,对模具无搭边冲裁时的冲片转角形状进行改进,实现无搭边冲裁叠铆的要求,节约了原材料,对转子转位、磁轭、定子叠铆上模结构、下模结构进行优化组合,设计出合理的多工位级进模,降低了模具生产成本,并对关键工位定子叠铆进行了分析。生产实践证明:模具结构合理,生产可靠,满足企业生产要求。     

修复大中型铸件的金属嵌合法

在大中型设备运行过程中,由于受到超过其最大许用载荷的冲击,在铸铁机件的薄弱部位产生裂纹或折断有时是不可避免的。在实践中找到了一种采用波形健与波形槽相铆击嵌合,使损坏的铸铁机件得以修复的方法。对于波形键与波形槽的加工制造及其嵌合都要严格的按一定生产程序进行。机件修复的结果表明,完全能够使设备达到良好的运行状态,稳定、可靠。加工的产品件能够达到图纸要求精度。     

电机定转子铁芯自动叠装模设计

通过对电机定子和转子铁芯自动叠装技术的介绍,将铁芯叠装形式的分类、扭斜铆接叠压点的几何形状、分布、冲压深度以及如何实现铁芯叠装的分台进行说明,提出模具设计时应注意的要点,对此类模具的设计有一定的参考作用。     

磁阻型电磁铆接工艺研究

目的 为了掌握磁阻型电磁铆接新技术,研究工艺参数对铆接驱动力的影响规律.方法 通过改变放电电压、线圈导线截面尺寸和弹丸尺寸等参数进行磁阻型电磁铆接试验研究,分析各参数对直径为8 mm的2A10铆钉镦头变形的影响,与感应式电磁铆接的成形铆钉进行对比.结果 随着放电电压的升高,铆钉镦头变形量增加;相同放电能量下,导线截面尺...     

Fabrication of Black In2O3 with Dense Oxygen Vacancy through Dual Functional Carbon Doping for Enhancing Photothermal CO2 Hydrogenation

Photothermocatalytic CO₂ reduction as the channel of the energy and environmental issues resolution has captured persistent attention in recent years. In₂O₃ has been prompted to be a potential photothermal catalyst in this sector on account of its unique physicochemical properties. However, different from the metal-based photothermal catalyst with the nature of efficient light-to-thermal conversion and H₂ dissociation, the wide-bandgap semiconductor needs to be modified to possess wide-wavelength-range absorption and the active surface. It remains a challenge to achieve the two aims simultaneously via a single material modulation approach. In this study, one strategy of carbon doping can empower In₂O₃ with two advantageous modifications. Carbon doping can reduce the formation energy of oxygen vacancy, which induces the generation of oxygen-vacancy-riched material. The introduction of oxygen defect levels and carbon doping levels in the bandgap of In₂O₃ significantly reduces this bandgap, which endows it full-spectral and intensive solar light absorption. Therefore, the carbon doped In₂O₃ achieves effective light-to-thermal conversion and delivers a 123.6 mmol g^–1 h^–1 of CO generation rate with near-unity selectivity, as well as prominent stability in photothermocatalytic CO₂ reduction.     

加热板铆合模具的设计制造

介绍了利用液压机或冲床的一个工作循环 ,完成零件翻边、胀形、铆合3道工序的铆合模具的结构 ,该模具结构简单 ,设计合理 ,操作方便。     

气动可调式无头铆钉翻边装置

阐述了无头柳钉翻边装置的设计原理和使用。     

复合材料-铝合金碾铆与螺栓连接强度对比分析

通过碾铆连接和螺栓连接对复合材料-铝合金进行了连接实验,对两种连接方式的接头进行了静拉伸测试,对比分析了有无垫片和是否粘接两种因素对接头连接强度和能量吸收的影响。结果表明:添加垫圈后,两种接头的峰值载荷趋于一致,但螺栓连接接头的失效位移高于碾铆连接接头,且其能量吸收值比碾铆连接接头高16.29%,有更强的缓冲吸震能力;引入粘接对两种接头的抗拉伸强度影响不大,螺栓连接失效的峰值载荷略高于碾铆连接,两种接头的失效位移和能量吸收基本相同。     

复合材料电磁铆接技术研究现状及展望

电磁铆接是实现复合材料干涉配合连接的有效途径,通过控制适当的干涉量能有效提高复合材料初始挤压破坏强度,同时能延长连接件的疲劳寿命。随着有限元技术的发展,数值模拟将在复合材料电磁铆接中扮演越来越重要的角色。总结复合材料电磁铆接技术在国内外的研究现状,并对其发展趋势进行展望。     

Digital modelling of the galvanic corrosion behaviour of a self–piercing riveted AZ31 ‐ AA5083 hybrid joint

This study focuses on the corrosion phenomena occurring between aluminium AA5083 and AZ31 magnesium sheets, joined with a coated steel self‐piercing rivet, by punch rivet technology. These assemblies were studied by immersion tests and scanning vibrating electrode technique (SVET) in sodium chloride solutions, in order to evaluate the effects of joint geometry on corrosion resistance. The observed results were also used for validation of transient finite element method (FEM) simulations. A fully coupled continuum model was used to compute the evolution of electrochemically and chemically induced corrosion attack, formation of corrosion products and their influence on the overall system kinetics. Additionally, X‐ray diffraction (XRD) analysis of the corrosion products provided evidence for the formation of layered double hydroxides (LDH), which is in accordance with the model outputs. The current study targets the optimization of joint setup for corrosion resistance. The suitability of corrosion simulation for the AZ31‐AA5083‐Almac ternary galvanic system is shown alongside. The developed modelling approach represents a step forward in terms of digital service‐life assessment of multi‐material joints.