Pashmforoush Farzad, Rahimi Abdolreza
Appl Opt. 2015 Mar 20;54(9):2199-207. doi: 10.1364/AO.54.002199.
BK7 is an optical glass extensively used in lens manufacturing. In this work, magnetic abrasive finishing (MAF) method was utilized for finishing of this hard-to-machine material and the effect of various process parameters on surface roughness was investigated using response surface methodology. The best surface roughness value achieved was 23 nm. Among various finishing parameters, the abrasive size was found to be the most significant parameter followed by machining gap, magnetic particles size, rotational speed, and percentage weight of binding agent. Also, the mechanisms of material removal were studied by using atomic force microscopy (AFM). The AFM observations revealed that both microcutting and microfracture mechanisms might exist during MAF of brittle materials depending on the finishing conditions.
BK7是一种广泛应用于镜片制造的光学玻璃。在这项工作中，采用磁研磨加工（MAF）方法对这种难加工材料进行加工，并使用响应面法研究了各种工艺参数对表面粗糙度的影响。获得的最佳表面粗糙度值为23纳米。在各种加工参数中，磨料粒度被发现是最显著的参数，其次是加工间隙、磁性颗粒尺寸、转速和粘结剂重量百分比。此外，还通过原子力显微镜（AFM）研究了材料去除机制。AFM观察结果表明，在脆性材料的磁研磨加工过程中，根据加工条件的不同，可能同时存在微切削和微断裂机制。
