Research on laser preparation and grinding performance of hydrophilic structured grinding wheels
Research on laser preparation and grinding performance of hydrophilic structured grinding wheels
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DOI：
10.1016/j.ceramint.2022.10.240
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发表时间：
2022-10
影响因子：
5.2
通讯作者：
H. Deng;Xiaoshen Wu;Guangzhi Yuchi;Guoyue Liu;Z. Xu;Jun Yi
中科院分区：
文献类型：
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作者：
H. Deng;Xiaoshen Wu;Guangzhi Yuchi;Guoyue Liu;Z. Xu;Jun Yi
为解决氧化铝陶瓷等难切削材料磨削时的工件损伤和砂轮堵塞问题，首次将分布于体表的具有正六边形结构、亲水性强、抗磨损功能高的生物作为仿生对象，通过制备工艺优化，对亲水结构青铜结合剂金刚石砂轮的结构尺寸设计和磨削性能评价进行了探讨。揭示了制备工艺参数对砂轮表面微观形貌和结构尺寸精度的影响规律，提出了一种基于焦点位置和扫描次数协调控制的激光成型新工艺，其可以在研磨表面上高效地制备具有小壁倾角和几毫米深度的正六边形结构，盘首次阐明了亚毫米级结构尺寸对砂轮表面磨削液滴接触角和砂轮表面亲水性的影响。与非结构化砂轮相比，结构化砂轮的亲水性得到显著提高，其表面亲水性随结构间距和深度的增加而增加，但与结构边长的相关性不大。对亲水结构砂轮和非亲水结构砂轮在极端工况下的磨削性能进行了评价。在磨削深度为50 μ m、100 μ m和200 μ m的条件下，与非结构化砂轮相比，结构化砂轮的磨削峰值温度分别降低了18.0%、30.4%和15.2%，磨削后氧化铝陶瓷的表面损伤深度降低了53.7%，46.8%和24.3%。亲水结构砂轮可增强磨削液/切屑的储存和输送能力，有效缓解砂轮堵塞和钝化，显著降低磨削高温和损伤。下一步，我们将尝试将这种类型的砂轮应用于成形磨削，为抑制难切削材料的成形磨削损伤提供可靠的解决方案。
In order to solve the problems of workpiece damage and grinding wheel clogging when grinding difficult-to-cut materials such as alumina ceramics, organisms with regular hexagonal structures distributed on the body surface and with strong hydrophilicity and high anti-wear functions were used as biomimetic objects for the first time, and the preparation process optimization, structure size design and grinding performance evaluation of hydrophilic structured bronze-bonded diamond grinding wheels were explored in this paper. The influence of the preparation process parameters on the micro-topography and the dimensional accuracy of the structure on the surface of the grinding wheel was revealed, and a new laser structuring process based on the coordinated control of focus position and scanning times was proposed, which could efficiently prepare regular hexagonal structures with a small wall inclination angle and a depth of several millimeters on the surface of the grinding wheel. It was the first to clarify the influence of sub-millimeter-scale structure size on the contact angle of grinding fluid droplet on the surface of the grinding wheel and the surface hydrophilicity of the grinding wheel. Compared with that of the non-structured grinding wheel, the hydrophilicity of the structured grinding wheel was significantly improved, and its surface hydrophilicity increased with the increase of the structure spacing and depth, but had little correlation with the structure side length. The grinding performance of hydrophilic structured grinding wheels and non-structured grinding wheels was evaluated under extreme working conditions. Under the condition of grinding depth of 50 μm, 100 μm and 200 μm, compared with that of the non-structured grinding wheel, the peak grinding temperature of the structured grinding wheel was reduced by 18.0%, 30.4% and 15.2%, respectively, and the surface damage depth of the alumina ceramic after grinding by the structured grinding wheel was reduced by 53.7%, 46.8% and 24.3%, respectively. The hydrophilic structured grinding wheel can enhance the storage and transportation capacity of grinding fluid/chips, effectively relieve the clogging and dullness of the grinding wheel, and significantly reduce the high temperature and damage of grinding. In the next step, we will try to apply this type of grinding wheel to form grinding, in order to provide a reliable solution for suppressing form grinding damage of difficult-to-cut materials.