Model of Surface Roughness in Fixed Abrasive Lapping of K9 Glass

doi:10.3901/JME.2015.21.199

Abstract

Abstract: Surface roughness model is an important basis for lapping process design and process parameter selection. K9 glass is one of the most widely applied optical materials. The model of surface roughness in lapping of K9 glass is established to improve processing efficiency and save production cost. Based on surface microstructure of the lapping pad, fixed abrasive lapping process is simplified, and the number of effective abrasives and the single abrasive depth of cutting into the workpiece are calculated. Combing the force equilibrium in lapping process, surface roughness model of fixed abrasive lapping of K9 glass is established. The model is verified by lapping of K9 glass with different abrasive particle sizes and concentrations, as well as different pressures. The results show that surface roughness of K9 glass is proportional to particle size and one-third power of lapping pressure, and inversely proportional to two-ninth power of the pad concentration. The changing trend of theoretical surface roughness values over abrasive particle sizes and pad concentrations as well as lapping pressures matches experimental trend. Surface roughness of K9 glass can be successfully predicted by the model in fixed abrasive lapping process, which can be used to guide the lapping process design and process parameters selection with high reliability.

Key words: K9 glass, model, number of effective abrasives, surface roughness, fixed abrasive lapping

LI Jun, WANG Huimin, WANG Wenze, HUANG Jiandong, ZHU Yongwei, ZUO Dunwen. Model of Surface Roughness in Fixed Abrasive Lapping of K9 Glass[J]. Journal of Mechanical Engineering, 2015, 51(21): 199-205.

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