激光修整圆柱形CBN砂轮中偏焦量对能量分布的影响

Effect of Focal Offset on Energy Distribution in Laser Truing Grinding Wheel

激光束偏焦量是修整圆柱形砂轮的重要参数,它影响光斑形状及其能量密度,因而影响激光修整砂轮的质量。介绍了用数控Nd:YAG激光系统修整圆柱形CBN砂轮过程中,偏焦量对光斑作用能量分布的影响与其修整作用的基本原理,建立了激光偏焦量作用于圆柱形砂轮上任意一点的光斑面积数学模型;给出了调整激光偏焦量修整圆柱形砂轮的关系与参数范围;采用计算与试验结合的方法,得到激光偏焦量、输入能量密度及激光修整参数的对应关系。研究结果为进一步提高激光修整圆柱形陶瓷结合剂CBN砂轮的质量提供了理论与试验依据。

Laser focal offset is one of very important processing parameter on cylindrical surface, which affects incident density of laser beam, and plays role in laser processing dimensional accuracy and quality. A new method to true grinding wheels using Nd. YAG laser was presented. Both modeling and experimental studies were conducted to investigate the effects of focal offset and its critical value on truing properties in laser processing a small vitrified CBN grinding wheel. The effective tru- ing was achieved by optimal selection of suitable laser power density through adjusting a focal offset. The main difference in heat conductivity generated by focal offset was examined. In addition, the underlying mechanisms of laser truing and＇dressing process was investigated by means of modeling and experimental analysis of focal offset, critical focal offset and microscope structural characteristic that are shown to be reasonable.