磁控微粉砂轮固化工艺对砂轮磨削性能的影响

目的研究砂轮在固化过程中,固化温度和固化时间对砂轮磨削性能的影响。方法通过测试两种固化工艺制备的砂轮的抗压强度、硬度以及其加工硬质合金YG8的磨削比、表面粗糙度、加工非球面的形状精度随固化温度的变化,来评价固化温度对磁控微粉砂轮磨削性能的影响。结果砂轮的磨削性能与其固化温度、时间有直接关系。磨削比随着固化保温时间的增长呈先增长后下降的趋势。固化温度决定砂轮固化速率和砂轮对过度固化的敏感程度,170℃固化能使砂轮在较短时间达到最佳磨削性能,但是固化时间超过8 h时,其性能会迅速衰减。130℃固化有利于防止砂轮过度固化而造成性能急剧降低。通过对固化工艺的研究,170℃/5 h+130℃/5 h固化工艺下制备的砂轮磨削性能最佳,该砂轮磨削YG8得到最佳的面形精度为365 nm,最佳表面粗糙度为3 nm。结论砂轮在固化过程中,固化温度与固化时间直接影响树脂的固化反应速率与固化程度,通过对固化工艺的实验研究,在本实验条件下得到了最优的固化工艺参数。

Effects of Curing Process for Magnetic Control Micro Powder Grinding Wheel on Grinding Performance

The work aims to study effects of curing temperature and curing time on grinding performance during curing process of grinding wheel. The effects of curing temperature on grinding performance of magnetic control micro powder grind-ing wheel were evaluated by testing changes in compressive strength, hardness of grinding wheels prepared by adopting two curing processes, grinding ratio, surface roughness and form accuracy of processed cemented carbide YG8 as curing temperature changed. Grinding performance of grinding wheel had direct relation with its curing temperature and time. The grinding ratio tended to rise first then decline as the curing holding time prolonged. Curing rate of grinding wheel and its sensitivity to exces-sive curing were determined by curing temperature. Optimal grinding performance could be achieved quickly at the curing tem- perature of 170℃, but grinding performance declined rapidly as the curing time exceeded 8 h. Curing at 130℃ might prevent sharp degradation of grinding performance caused by over-curing. The grinding wheel exhibited optimal grinding performance provided with the curing process of 170℃/5 h+130℃/5 h. A mirror surface with optimal surface roughness of 3 nm inRa and optimal form accuracy of 365 nm in PV was obtained by grinding YG8. In the curing process of grinding wheel, curing temper-ature and curing time directly affect curing reaction rate and curing degree of resin, optimal curing process parameters are ob-tained under the experimental condition based upon experimental study of curing process.