摘要
通过对单颗 CBN磨粒和普通磨粒磨损特性的比较以及对陶瓷结合剂 CBN砂轮磨损特性和磨削性能的分析 ,研究了 CBN砂轮磨削难加工材料时磨削液的作用 ,提出了陶瓷结合剂 CBN砂轮磨削液的选择依据。研究结果表明 ,CBN磨粒粘附后所承受的磨削力增大 ,由此所造成 CBN砂轮磨粒和结合剂破碎是不利于发挥 CBN砂轮的优异性能的主要因素。磨削液应以抑制粘附、减小摩擦的润滑作用为主。与水基磨削液相比 ,磨削不同的难加工材料时选用极压磨削油可减小磨削力2 0 %～ 50 %、降低磨削温度 70～ 2 0 0℃、提高磨削比 3～
The selection of suitable grinding fluid is important for getting the best out of vitrified bonded CBN wheel in grinding titanium alloy and ultra high strength steel. Proper selection requires a clear understanding of the effect of grinding fluid on grinding properties. We studied wear characteristics of CBN grain by the single grain cut test and investigated wear characteristics of the vitrified bonded CBN wheel. We observed and analyzed the wheel surface and, then, measured the grinding force, the grinding temperature and the grinding ratio for three grinding fluids: (1) synthetic water based fluid, (2) emulsion, (3) extreme pressure (EP) oil. Main conclusions are, in our opinion, as follows: (1) Metal chips adhered to CBN grains cause grinding force to become larger, thus leading to breaking of the CBN grains and bond. This is the main reason why the vitrified bonded CBN wheel is worn down in grinding the difficult to grind materials. (2) The main effects of grinding fluid are the reduction of metal chips adhered to CBN grains and the lessening of friction. (3) EP oil is the best of the three grinding fluids used. In grinding titanium alloy, it is better than synthetic water based fluid in the following respects: grinding force reduced by 50%, grinding temperature lowered by 200℃,and grinding ratio increased by a factor of 30.In grinding ultra high strength steel, it is better than emulsion in the following respects: grinding force reduced by 20%, grinding temperature lowered by 70 ℃,and grinding ratio increased by a factor of 3.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2000年第4期527-531,共5页
Journal of Northwestern Polytechnical University
