Effect of Al2O3 hollow sphere on properties of resin bond diamond disc in sapphire grinding
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摘要: 为改善蓝宝石研磨效果,在树脂结合剂金刚石磨盘中添加氧化铝空心球。通过力学性能测试、SEM扫描观测和实际磨削实验,研究空心球粒径及体积分数对树脂结合剂强度和磨盘性能的影响。研究表明:试样抗折强度随空心球粒径和比例的增大而降低;当添加空心球的体积分数为30%时,空心球粒径对试样抗折强度的影响基本消失。磨削实验证明:添加氧化铝空心球可提高蓝宝石磨削时的效率,并改善蓝宝石的表面粗糙度。添加体积分数为20%的空心球的磨盘在磨削过程中具有最好的综合磨削性能,与不加空心球的磨盘相比,磨削效率提高82.6%,表面粗糙度降低至Ra 0.249μm。Abstract: To improve the lapping effect of sapphire grinding, Al2O3 hollow sphere is added into resin bond diamond grinding disc.Effect of sphere size and volume fraction on strength of the bond and performance of the disc are studied through mechanical test, SEM analysis and actual grinding.Resultsshow that as the size and proportion of sphere increase, the bending strength of the sample decreases, and that when the volume fraction of sphere reaches 30%, sphere size has no obvious effect on the strength.It is also found that efficiency of grinding sapphire is increased through adding Al2O3 hollow sphere, and the surface roughness of sapphire is improved.In conclusion, when volume fraction of sphere is 20%, the grinding disc has best comprehensive grinding performance, whose Ra decreases to 0.249μm and the efficiency is increased by 82.6% compared with that of non-sphere grinding discs.
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Key words:
- hollow sphere size /
- volume fraction /
- bending strength /
- grinding efficiency
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