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采用不同含水率的酚醛树脂金刚石砂轮,对硬质合金YG8进行了平面磨削试验,研究了含水率变化导致的砂轮磨削性能变化对磨削比、磨削功率和工件表面粗糙度的影响规律,并对砂轮磨削后表面形貌进行了观测,揭示了酚醛树脂金刚石砂轮磨削性能随含水率变化的规律。试验结果表明:含水率越高,砂轮的组织均匀性就越差,机械性能和磨削性能不稳定且总体趋势变差。磨削比、Ra值在一个耐用度周期内波动较大,不适合精密磨削加工。为了获得良好且稳定的粗糙度表面,应选用含水率小于0.3%的树脂原材料制作砂轮。含水率较低时(<0.3%)磨削功率相对稳定,砂轮表面磨粒脱落率低。但不是含水率越高时磨削性能越差,砂轮的磨削比、磨削钝化速度、粗糙度与含水率不是线性关系。
Using different moisture content of phenolic resin diamond grinding wheel, the plane grinding test of cemented carbide YG8 was carried out. The influence of grinding wheel grinding performance change on grinding ratio, grinding power and workpiece surface roughness caused by the change of water content was studied The surface morphology of grinding wheel after grinding was observed and the law of grinding performance of phenolic resin diamond grinding wheel with moisture content was revealed. The experimental results show that the higher the moisture content is, the worse the homogeneity of the grinding wheel is. The mechanical properties and the grinding performance are not stable and the overall trend becomes worse. Grinding ratio, Ra value fluctuations in a durability cycle, not suitable for precision grinding. In order to obtain a good and stable surface roughness, should be used less than 0.3% moisture content of resin raw materials for making wheel. When the moisture content is low (<0.3%), the grinding power is relatively stable, and the abrasion rate of the grinding wheel surface is low. However, the higher the moisture content is, the worse the grinding performance is. The grinding ratio of the grinding wheel, the passivation speed of grinding, the roughness and the water content are not linear.