Abstract Laser dressing technology is expected to solve the dressing problem of superabrasive forming grinding wheels. However, this technology is still in the initial stage of research, and is facing bottlenecks such as poor profiling accuracy due to the difficulty of tool setting of laser beam, uncontrolled sharpening topography due to laser focus characteristics, and reduced grain performance due to ablation thermal damage. In this paper, the research on laser dressing of arc-shaped resin-bonded diamond grinding wheel with a grain size of about 180 μm was systematically carried out. Acoustic emission monitoring technology was first introduced into laser dressing, which solved the problem of low accuracy of tool setting of laser beam. The laser tangential profiling method based on deep cutting and intermittent feeding was improved to achieve efficient and precise profiling of arc-shaped grinding wheels. It took about 4.5 h to profile a parallel grinding wheel into an arc-shaped grinding wheel. Limited by the accuracy of the experimental device, the surface contour accuracy of the arc-shaped grinding wheel after profiling was currently only about 20 μm. It was found that the grains in the middle area of the surface of the grinding wheel were only slightly graphitized, and the damage degree of the grains in the edge area was more serious. A new method of laser sharpening based on layered scanning was proposed, which effectively reduced the difficulty of controlling the laser scanning trajectory, and achieved the uniform removal of the bond and the precise control of the grain protrusion height everywhere on the surface of the grinding wheel. It was found that the laser beam did not damage the diamond grains during the sharpening process. Compared with that before sharpening, the proportion of C and O elements in the resin bond after sharpening increased by about 5.7 % and decreased by about 5.0 %, respectively.

中文翻译：

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弧形树脂结合剂金刚石砂轮的激光修整

摘要 激光修整技术有望解决超硬磨料成形砂轮的修整问题。然而，该技术仍处于研究初期，面临着激光束对刀困难导致仿形精度差、激光聚焦特性导致磨削形貌不可控、烧蚀热导致晶粒性能下降等瓶颈。损害。本文系统地进行了粒度约180 μm的圆弧形树脂结合剂金刚石砂轮的激光修整研究。声发射监测技术首次引入激光修整，解决了激光束对刀精度低的问题。改进了基于深切和间歇进给的激光切向仿形方法，实现了弧形砂轮的高效精确仿形。将平行砂轮成型为弧形砂轮大约需要 4.5 小时。受实验装置精度的限制，仿形后的弧形砂轮的表面轮廓精度目前只有20 μm左右。发现砂轮表面中间区域的晶粒仅轻微石墨化，边缘区域的晶粒损伤程度更严重。提出了一种基于分层扫描的激光锐化新方法，有效降低了激光扫描轨迹的控制难度，实现了结合剂的均匀去除和砂轮表面各处颗粒突起高度的精确控制。发现激光束在锐化过程中没有损坏金刚石晶粒。与锐化前相比，锐化后树脂结合剂中C、O元素的比例分别增加约5.7%和减少约5.0%。