金刚石配比对微晶玻璃结合剂砂轮磨削寿命影响分析

Effect of diamond ratio on grinding life of microcrystalline glass-ceramic bonder grinding wheel

以某微晶玻璃结合剂为实验结合剂,制备了不同金刚石含量与粒度的金刚石试样。通过对试样的抗弯强度测试以及断口扫描电镜(SEM)观察,研究了不同金刚石含量对金刚石试样在力学方面的影响。通过金刚石试样与YG8立方块的磨削实验,研究了在不同金刚石含量与粒度的条件下试样对硬质合金在加工性能上的影响。实验结果表明,在设计范围内,金刚石浓度对试样的抗弯强度影响不明显。金刚石粒度相同时,5 s/0.01 mm的进刀速度下,磨耗比随着金刚石浓度提升先升高、后少量波动降低;2 s/0.01 mm的进刀速度下,磨耗比随着金刚石含量提升先增大、后减小。在不同金刚石粒度的情况下,5 s/0.01 mm的进刀速度时,磨耗比随着粒度变大而缓慢降低;2 s/0.01 mm的进刀速度时,磨耗比随着粒度变大而先缓慢增大、后急速降低。

In this paper,a microcrystalline glass-ceramic binder is used as the experimental binder,diamond samples with different diamond contents and particle sizes are prepared.The bending strength of the specimen is tested.The fracture is observed by Scanning Electron Microscope(SEM).The effect of different diamond contents on the mechanics of diamond samples is studied.Through the grinding experiment of diamond sample and YG8 cube,the influence of diamond content and particle size on the machining performance of cemented carbide is studied.The experimental result shows that the diamond concentration has little influence on the bending strength of the sample within the design range.When the diamond particle size is the same,the wear ratio increases firstly and then decreases with the increase of diamond concentration at 5 s/0.01 mm feeding speed.At 2 s/0.01mm feeding speed,the wear ratio increases at first and then decreases with the increase of diamond content.In the case of different diamond particle size,the wear ratio decreases slowly with the increase of grain size at the feed speed of 5 s/0.01 mm.At 2 s/0.01 mm feeding speed,the wear ratio slowly increases at first and then decreases rapidly with the increase of grain size.