高陡度非球面磨削亚表面损伤深度规律

发布时间：2018-04-01 17:01

本文选题：高陡度非球面　切入点：亚表面损伤　出处：《国防科技大学学报》2015年06期

【摘要】：具有高陡度非球面特性的光学元件可以明显改善光学系统的空气动力学性能,从而提升和优化系统综合性能。磨削加工方法可以作为此类元件的前期加工工序,而磨削难免会造成零件的亚表面损伤,且在这种高陡度非球面磨削加工中磨削参数是实时变化的,造成整个工件亚表面损伤深度不一致。针对这种情况,建立亚表面损伤预测模型,并结合半球形砂轮磨削的特点,通过理论计算预测非球面磨削亚表面损伤深度分布规律。在此基础上,以热压多晶氟化镁平面为对象进行模拟参数实验,通过磁流变抛斑点法得到各组参数下亚表面损伤深度情况,结果显示损伤深度范围在12.79μm~20.96μm之间,且沿试件半径方向由内向外呈增大趋势,结果与预测模型相吻合。
[Abstract]:Optical elements with high gradient aspherical properties can obviously improve the aerodynamic performance of optical systems and thus improve and optimize the comprehensive performance of the system.The grinding method can be used as the early processing procedure of this kind of components, and grinding will inevitably cause subsurface damage of the parts, and the grinding parameters change in real time in this kind of high steepness aspheric grinding process.Causes the entire workpiece subsurface damage depth to be inconsistent.In view of this situation, a subsurface damage prediction model is established. Combining with the characteristics of hemispherical grinding wheel, the distribution of subsurface damage depth of aspheric grinding is predicted by theoretical calculation.On this basis, the simulated parameter experiments were carried out on the plane of hot-pressed polycrystalline magnesium fluoride. The damage depth of subsurface was obtained by magneto-rheological speckle method. The results showed that the damage depth was in the range of 12.79 渭 m ~ 20.96 渭 m.Along the radius direction of the specimen, the trend is increasing from inside to out, and the result is in agreement with the prediction model.
【作者单位】：国防科技大学机电工程与自动化学院;超精密加工技术湖南省重点实验室;
【基金】：国家自然科学基金资助项目(51305450)
【分类号】：TG580.6

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