Super-abrasive Grinding Wheel with Helical Gooves

螺旋槽超硬磨料砂轮

• 批准号: 61850024
• 负责人: NAKAYAMA Kazuo
• 金额: $ 2.18万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61850024/
• 关键词: Helical groove; Super-abrasive wheel; CBN wheel; plating-bonded wheel; Grinding performance; Grinding forces; Coolant; 砥石寿命; クリープフィード研削; 砥石の製造

Helical grooves enqraves a conbentional alumina wheel proves to show favorable effects on the improvement of grinding performance such as decteasing of grinding forces and elimination of grinding burn. This research is to apply such helical grooves to super-abrasive wheels which are very expensive but have high grinding performance.Obtained results are as follows:For resin-bonded cBN wheel, hilical grooves decrease the grinding forces remarkably while the roushness of grouns surface ands wheel wear deteriorate due to poor grain holding of resin-bound. However, for wheels with pore-less bond such as resion or metal, the effect of helical grooves to improve the coolant penetration to the grinding point is notable and only 0.3mm deep grooves provide sufficient coolant to remove grinding heat and prevent grinding burn.Helical grooves formed on plating-bonded cBN wheel dectrase the number ofd grain cutting edges which are engaging with workpiece in contact arc area. Therefore, when the wear flat area inctrases, helical grooves relieve the rapid increasing of grinding forces and consequently the wheel lifr and utilize expensive super-abrasives efficiently.Several economical methods to engrave hilical grooves on super-abrasive wheel face are also attempted. For plating-bonded wheel, grooves can be formed witout difficulty using masking method on the wheel face. For resin-bonded wheel, a aluminum disc with thin molded strips of grain layer glued on a wheel face is produced as a trial and it proved to have good grinding performance and sufficient durability in wet condition.

实践证明，螺旋槽对改善磨削性能，降低磨削力，消除磨削烧伤，具有良好的效果。本研究将这种螺旋槽应用于价格昂贵但磨削性能较高的超硬磨料砂轮上，结果表明：对于树脂结合剂CBN砂轮，螺旋槽显著降低了磨削力，但由于树脂结合剂颗粒持持性差，磨削表面粗糙度和砂轮磨损恶化。然而，对于无孔结合剂的砂轮，如凹槽或金属，螺旋槽对提高冷却液对磨削点的渗透率的效果是显著的，只有0.3 mm深的沟槽提供了足够的冷却液来散热磨削和防止磨削烧伤。因此，当磨耗平坦面积增大时，螺旋槽可以减缓磨削力的迅速增加，从而有效地提升砂轮和利用昂贵的超硬磨料，并尝试了几种在超硬砂轮表面刻划凹槽的经济方法。对于电镀结合剂砂轮，在砂轮表面采用遮盖法可以很容易地形成凹槽。对于树脂结合剂砂轮，试制了砂轮表面粘有细小模压颗粒层的铝盘，该砂轮在潮湿条件下具有良好的磨削性能和足够的耐久性。

项目成果

中山一雄: 精密工学会誌.

中山一夫：日本精密工程学会杂志。