金刚石砂轮的ECD修锐和整形研磨及其对硬脆材料的加工

ECD truing/dressing and cutting edge truncation of diamond grinding wheel and its processing of hard and brittle materials

为研究金属结合剂金刚石砂轮切削刃修锐整形对硬脆材料加工表面形态的影响,先通过接触放电法对SD600金属结合剂砂轮切削刃进行修锐,再用整形研磨方法对砂轮表面金刚石磨粒的不同切削刃高度进行整形研磨,最后用修整好的砂轮磨削加工用于光学设备的硼硅玻璃、石英玻璃、石英晶体和蓝宝石等几种硬脆材料。结果表明:硬脆材料粗糙度的改善程度取决于材料的种类,硼硅玻璃、石英玻璃、石英晶体、蓝宝石的最大粗糙度Ry比砂轮整形前的分别减少了44%、34%、30%、26%,且石英晶体材料几乎可以实现延性磨削。

In order to study the effect of metal-bonded diamond grinding wheel cutting edge truncation on the surface morphology of hard and brittle materials,the cutting edge of SD600 metal-bonded diamond grinding wheel was first protruded from the metal bond matrix by means of electric contact discharge(ECD)truing and dressing method,then the different cutting edge heights of diamond grains on the surface of the grinding wheel were truncated by cutting edge truncation way.Finally,the hard and the brittle materials for optical equipment,such as borosilicate glass,quartz glass,quartz crystal and sapphire,were plunge ground with the finished grinding wheel.The results show that the improvement of the roughness of the hard and the brittle materials depends on the types of materials.The maximum roughness Ry of borosilicate glass,quartz glass,quartz crystal and sapphire is reduced by 44%,34%,30%and 26%respectively compared with that before grinding wheel ECD truing and dressing,and the quartz crystal material most can be realized ductile grinding.