大型高压铸铁烘缸有限元分析和结构优化设计

针对大型高压烘缸应力集中和局部位移偏大等问题,运用有限元分析方法,设计了调整侧缸盖和轴毂连接处的过渡圆角、适当增加两边端盖厚度等结构优化方案。优化结果可使烘缸满足工业生产的需求并符合企业标准的规定。     

基于企业项目导向的互换性及测量技术课程的建设与探索

为了很好地落实教育部"卓越工程师教学培养计划",并解决以往互换性课程中出现的教学问题,提出了基于企业项目导向的教学方式,从教学素材、教学方法、实施过程、考核方式等方面进行探索和尝试,以期达到预期效果。     

阴极平动式摩擦辅助精密电铸的研究

为了实现非回转体类零件的精密电铸成形,提高电铸层的质量和电铸速度,文章提出了阴极平动式摩擦辅助精密电铸,在电铸液中充满陶瓷微珠等一类硬质粒子,阴极在平动机构的驱动下做平动,使硬质粒子不断摩擦和撞击阴极表面.通过对金属镍的电铸实验表明:阴极平动式摩擦辅助精密电铸能很好地去除沉积层表面的针孔、麻点等缺陷,获得的电铸层外表面Ra值达到0.016 μm.阴极平动式摩擦辅助精密电铸能有效地改变电铸层的组织结构,细化晶粒,提高电铸层的机械性能.     

铝合金控制臂球头销旋铆工艺有限元分析

汽车控制臂球头销封装是汽车底盘零件装配中的重要一环,其装配质量直接影响到汽车转向部件的寿命。采用有限元分析方法对铝合金控制臂球头销的旋铆封装技术进行了研究,对旋铆过程中铝合金控制臂的变形及受力情况进行了分析,并通过试验方法进行了验证,为汽车控制臂球头销的整体封装提供了有效的技术支持。     

Effect of electron beam evaporation process parameters on infrared refractive index of Ge film

Ge films were prepared at different deposition temperatures and ion source bias voltage using the electron beam evaporation. The infrared refractive index was obtained by spectral inversion. Results show that the refractive index becomes larger as the deposition temperature increases. The maximum refractive index at the wavelength of 4 000 nm is 4.274 with the deposition temperatures of 210 °C. The refractive index of film decreases first and then increases as the bias voltage increases. When the ion source bias voltage is 120 V, the refractive index of the film is the smallest. The difference in extinction coefficient of Ge films prepared by different process parameters is small.     

水动马达叶片倾角的设计计算

针对马达叶片的伸缩、泄漏及摩擦等问题 ,从理论上分析了叶片安装倾斜角的方位 ,并运用数学建模来确定了具体的角度值     

无裂纹硬铬电镀的试验研究

针对传统硬铬镀层会出现裂纹的问题,采用了一种新的电镀硬铬方法--摩擦辅助脉冲电镀无裂纹硬铬工艺.即在电镀铬的过程中,在阴阳极之间添加不导电的游离粒子,随着阴极的转动,游离粒子与阴极表面相对运动,产生扰动作用,不断摩擦、撞击阴极表面进行电镀铬试验.对镀铬层的表面形貌、微观组织结构和耐腐蚀性进行了测试,试验表明,采用摩擦辅...     

Se离子束辅助沉积CIS过程的数值分析

通过研究连续Se离子束辅助磁控溅射技术,在柔性聚酰亚胺基底上沉积形成CIS薄膜的过程,建立了相应的薄膜沉积模型。在此基础上,以离子注入深度效应作为研究对象,从扩散均匀性角度进行模拟计算,并与传统气相原子沉积方法进行比较。通过比较分析,计算出Se扩散均匀性为90%时,采用离子束辅助沉积所需的衬底温度明显低于气相原子沉积所需的衬底温度。     

800 MPa级TRIP钢窄搭接焊接工艺研究

通过杯突试验、表面质量观察、焊缝金相组织分析,研究了800MPa级TRIP钢的焊接工艺性能。实验结果表明,焊接前无需预热处理;随着焊接电流的降低,焊缝表面起皮缺陷减轻;采用低电流、低焊接速度的合理匹配,并投入后退火工艺,焊缝熔合线区金相组织为贝氏体,可获得合格的杯突试验和优异的焊缝表面质量;试验钢焊接工艺选择与普材搭接焊接可获得最佳焊缝质量焊缝。     

Orbital-abrasion-assisted electroforming of non-rotating parts

A novel technique of electroforming with orbital moving cathode was carried out for the fabrication of non-rotating thin-walled parts. This technique features a large number of insulating and insoluble hard particles as a real-time polishing to the cathode. When cathode moves, hard particles polish its surface and provide the nickel non-rotating parts with near-mirror finishing. Morphology, microstructure, surface roughness and micro hardness of deposits fabricated by novel method were studied in contrast with the sample produced by traditional electroforming methods. Theoretical analysis and experimental results showed that the novel technique could effectively remove the hydrogen bubbles and nodules, disturb the crystal nucleation, and refine the grains of layer. The mechanical properties were significantly improved over traditional method. The microhardness of the layer was in a uniform distribution ranging from 345 HV to 360 HV. It was confirmed that this technique had practical significance to non-rotating thin-walled parts.