一种高精度易变形U型悬臂结构件的加工方法

通过分析U型悬臂结构件精加工工艺中造成零件变形等影响零件加工质量稳定性的因素,优化U型悬臂结构件加工工艺流程,改进加工装夹方法,设计专用工装,控制零件装夹变形量,从根本上解决了目前加工方法中的缺陷与不足,实现U型悬臂结构件优质高效稳定的生产。

悬臂结构件加工参数与变形响应数值模拟研究

基于有限元数值模拟技术,开展装夹方式与切削参数对悬臂结构件加工变形综合影响规律研究,分析加工过程模态、谐响应以及不同参数下温度场、应力场及切削力的变化趋势。结果表明:加工该L型零件悬臂块上下表面时,使用三爪卡盘进行定位装夹,整体稳定性最好。增大主轴转速时,温度场、应力场和切削力均呈增大趋势,主轴转速为37.5r/min,切削深度为1mm,进给量为23.5mm/min时可保证位置公差0.1mm的要求,并获得较好的表面粗糙度。

Laterally Electrostatically Driven Poly 3C-SiC Folded-Beam Resonant Microstructures

Micromachined comb-drive electrostatic resonators with folded-cantilever beams were designed and fabricated. A combination of Rayleigh＇s method and finite-element analysis was used to calculate the resonant frequency drift as we adjusted the device geometry and material parameters. Three micromachined lateral resonant resonators with different beam widths were fabricated. Their resonant frequencies were experimentally measured to be 64.5,147.2, and 255.5kHz, respectively, which are in good agreement with the simulated resonant frequency. It is shown that an improved frequency performance could be obtained on the poly 3C-SiC based device structural material systems with high Young＇s modulus.

激光熔覆周向倾斜薄壁圆环成形工艺的研究

通过建立周向倾斜薄壁圆环模型,得到了周向偏移量和倾斜角之间的关系;通过优选周向偏移角,并基于激光熔覆近净成形技术,获得了结构稳定、高度和宽度误差较小的周向悬臂薄壁圆环。结果表明,满足熔覆要求的熔覆件的偏移角为0.75°,倾斜角为25.95°;周向倾斜薄壁圆环成形较优的工艺参数组合是周向偏移量为0.11mm,Z轴提升量为0.224mm。