磁力研磨加工K9光学玻璃的实验研究

Experimental Study on Magnetic Abrasive Finishing K9 Optical Glass

目的提高K9光学玻璃研磨加工的材料去除率及表面质量。方法采用改进的磁力研磨工艺对玻璃表面进行加工,改变相对运动方式,磁力研磨过程中工作台及工具头同时转动。以材料去除率及表面质量为研究目标,研究磁力研磨主要工艺参数的影响。优选了工具头转速、研磨压力、工作台转速、磨粒大小等关键参数,进行了一系列实验。利用KEYENCE VK系列的形状测量激光显微镜观察不同加工条件下的微观形貌,并分析主要加工参数对表面质量的影响。利用JJ124BC双杰电子分析天平对加工前后进行称量,计算材料去除率。结果在本实验装置下,采用工具头转速为1500 r/min、工作台转速为200 r/min、加工间隙为2 mm、磨粒目数为150目的工艺参数时,加工试件的表面粗糙度值Ra达到120 nm。从3D微观形貌来看,该参数条件下可以获得更好的表面质量,表面一致性较好,最高点的值为2.8μm。结论经过改进的磁力研磨加工方法,研磨速度及研磨压力仍是关键的加工因素,K9光学玻璃的加工实验对硬脆材料的加工具有一定借鉴意义。

The work aims to improve material removal rate and surface quality of K9 optical glass after abrasive finishing.The glass surface was processed in improved magnetic grinding process.Mode of relative motion was changed so that workbench could rotate along with toolhead during magnetic abrasive finishing.With material removal rate and surface quality as research objectives,the effects of main process parameters were studied for magnetic abrasive finishing.Key parameters such as toolhead rotation speed,grinding pressure,workbench speed,abrasive size were selected,and a series of experiments were done.Micro morphology under different processing conditions was observed with KEYENCE VK series shape measurement laser microscope,and the influence of main processing parameters on surface quality was analyzed.The glass was weighed with JJ124BC double electronic analytical balance before and after the processing,and material removal rate was calculated.Provided with the experiment equipment,surface roughness Ra of processed sample was 120 nm when the toolhead rotation speed was 1500 r/min,workbench speed was 200 r/min,machining gap was 2 mm,and abrasive mesh quantity was 150.According to 3D microstructure,better surface quality could be obtained provided with this group of parameters,surface consistency was better,and the highest point was 2.8μm.For the improved magnetic abrasive finishing,grinding speed and grinding pressure are still the key processing factors,and processing experiment of K9 optical glass provide some references for processing hard brittle materials.