激光与电火花复合修整粗粒度弧形金刚石砂轮试验研究

因受到激光高斯光束特性的影响，辐照在砂轮表面上的光斑大小和激光能量都跟随修整路径变化，难以实现高精度的弧形金刚石砂轮的修整，为此，提出采用激光粗修整和电火花精修整的复合修整方法。先用激光修整高效去除多余磨料层来得到弧形轮廓，再用一高精度弧形电极匹配该轮廓进行电火花修整，得到较高精度的弧形砂轮。在粒度为120的金刚石砂轮上试验修整半径为13 mm的弧形轮廓，最终修整出的弧形轮廓半径为13.006 mm，轮廓误差PV值为10.90 μm。最后，通过磨削氧化铝陶瓷验证了砂轮修整效果。检测磨削工件的弧形轮廓拟合半径为13.012 mm，轮廓误差PV值为11.33 μm。

Experimental Research of Coarse-grained Arc Diamond Grinding Wheel Dressed by Laser and Electrical Discharge Compound Dressing

 Affected by the characteristics of laser Gaussian beam， the differences of the spot size and laser energy irradiated on the surface of grinding wheels follound the dressing path， which was difficult to realize high-precision dressing of arc diamond grinding wheels. A compound dressing method was proposed using laser rough dressing and electrical discharge finished dressing. First， the laser dressing method was used to efficiently remove the excess abrasive layers to obtain an arc profile. Then, a high-precision arc electrode was used to match the profile for electrical discharge dressing. In this way，  a higher precision arc grinding wheel might be dressed. An arc profile with a radius of 13 mm was tested on a diamond grinding wheel with a grain size of 120. The radius of the final dressed arc profile is as 13.006 mm， and the PV value of the profile errors is as 10.90 μm. Finally， the grinding wheel dressing effectiveness was verified by grinding alumina ceramics. The fitting radius of the arc profile of workpiece is as 13.012 mm， and the profile error PV value is as 11.33 μm.