树脂基圆弧金刚石砂轮的在位精密成形修整技术

发布时间：2018-03-11 18:21

本文选题：金刚石砂轮　切入点：在位成形修整　出处：《机械工程学报》2016年11期 　论文类型：期刊论文

【摘要】：针对球面、非球面及自由曲面超精密磨削加工用树脂基圆弧形金刚石砂轮难以精密修整的问题,提出基于旋转绿碳化硅(GC)磨棒的在位精密成形修整技术。在分析GC磨棒和圆弧砂轮几何关系的基础上,确定修整过程中圆弧插补轨迹的补偿方法及GC磨棒运动轨迹的设计方案。采用KEYENCE激光测微仪采集砂轮圆弧特征点,表征圆弧砂轮的修整状况。研究不同粒度的GC磨棒、进给深度和圆弧插补速度对圆弧金刚石砂轮修整率和修整精度的影响规律。研究结果表明,该修整方法可根据加工曲率半径要求实现不同圆弧半径砂轮的精密在位修整,修整后可自动消除砂轮垂直方向的位置偏差;采用400#和800#的GC磨棒对D3和D7砂轮均有较高的修整率(0.7~6.7);与400#和1500#的GC磨棒相比,800#GC磨棒更适合粒度为D3和D7圆弧金刚石砂轮的精密修整;相比圆弧插补速度,进给深度对砂轮的圆弧半径尺寸误差和形状误差影响更大,进给深度越小,圆弧半径尺寸误差和形状误差越小;修整后两种砂轮的圆弧半径误差均可控制在5%以内,D3砂轮的形状误差可控制在3μm/4 mm以内,D7金刚石砂轮可控制在6μm/4 mm以内,修整后比修整前形状误差提高14倍左右。
[Abstract]:Aiming at the problem that resin base circular arc diamond grinding wheel used in ultra-precision grinding of spherical surface, aspherical surface and free-form surface is difficult to be trimmed precisely, The in situ precision forming and dressing technology based on rotating green silicon carbide (GC) grinding rod is presented. Based on the analysis of the geometric relationship between GC grinding rod and circular arc grinding wheel, The compensation method of the arc interpolation trajectory and the design scheme of the motion trajectory of the GC grinding rod are determined. The arc characteristic points of the grinding wheel are collected by using the KEYENCE laser micrometer to characterize the dressing condition of the circular arc grinding wheel. The GC grinding rod with different granularity is studied. The effect of feed depth and arc interpolation speed on the dressing rate and precision of circular arc diamond grinding wheel is studied. The results show that this dressing method can realize the precision dressing of grinding wheel with different arc radius according to the requirement of machining curvature radius. After dressing, the vertical position deviation of grinding wheel can be eliminated automatically. The GC grinding rod of 400# and 800# has higher dressing rate of D3 and D7 grinding wheel than 400# and 1500# GC grinding rod. Compared with 400# and 1500# GC grinding rod, the 800 #GC grinding rod is more suitable for precision dressing of D3 and D7 circular arc diamond grinding wheel. The influence of feed depth on the arc radius error and shape error of grinding wheel is greater. The smaller the feed depth, the smaller the arc radius size error and shape error. After dressing, the arc radius error of the two kinds of grinding wheels can be controlled within 5% 渭 m / 4 mm and the shape error of D7 diamond wheel can be controlled within 6 渭 m / 4 mm, and the shape error is about 14 times higher than that before dressing.
【作者单位】：哈尔滨工业大学机电工程学院;
【基金】：中央高校基本科研业务费专项资金(HIT.NSRIF.2015056) 中国博士后科学基金(2013M541361)资助项目
【分类号】：TG743

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