Development of a new high-shear and low-pressure grinding wheel and its grinding characteristics for Inconel718 alloy
Development of a new high-shear and low-pressure grinding wheel and its grinding characteristics for Inconel718 alloy
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DOI：
10.1016/j.cja.2021.08.013
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发表时间：
2021-09
影响因子：
5.7
通讯作者：
Bing Liu;Yebing Tian;Jinguo Han;Linguang Li;Zhiqiang Gu;Xintao Hu
中科院分区：
文献类型：
--
作者：
Bing Liu;Yebing Tian;Jinguo Han;Linguang Li;Zhiqiang Gu;Xintao Hu
镍基合金因其优异的力学性能而得到广泛应用。然而，镍基合金是一种典型的难加工材料，这极大地限制了其在制造领域的应用。为了提高磨削工件的表面质量，研制了一种具有高切向磨削力与法向磨削力比值的高剪切低压砂轮，用于Inconel718合金的选择性激光熔化（SLM）磨削。详细介绍了高剪切低压研磨工艺的原理，该工艺与传统的研磨工艺有很大的不同。阐述了新型砂轮的制造工艺。通过对磨削后工件表面粗糙度和表面形貌的分析，研究了不同工艺参数下该砂轮的磨削性能。得到了高剪切低压粉碎的最佳工艺参数。在最佳磨削条件下，磨削工件的表面粗糙度由初始的0.490 μm降低到0.232 μm。通过金相显微镜和场发射扫描电镜观察，发现磨削后工件上的初始划痕几乎完全消除。验证了新研制的高剪切低压砂轮的磨削性能。
Nickel-based alloy has been widely used due to its outstanding mechanical properties. However, Nickel-based alloy is a typical difficult-to-machine material, which is a great constrain for its application in the manufacturing field. To improve the surface quality of the ground workpiece, a new high-shear and low-pressure grinding wheel, with high ratio of tangential grinding force to normal grinding force, was fabricated for the grinding of selective laser melting (SLM) manufactured Inconel718 alloy. The principle of high-shear and low-pressure grinding process was introduced in detail, which was quite different from the conventional grinding process. The fabrication process of the new grinding wheel was illustrated. A serial of experiments with different processing parameters were carried out to investigate the grinding performance of the developed grinding wheel via analyzing surface roughness and surface morphology of the ground workpiece. The optimal processing parameters of high-shear and low-pressure grinding were obtained. The surface roughness of ground workpiece was reduced to 0.232 μm from the initial value of 0.490 μm under the optimal grinding conditions. It was found that the initial scratches on the ground workpiece were almost completely removed after the observations with the metalloscopy and the field-emission scanning electron microscopy (FE-SEM). The capability of the newly developed high-shear and low-pressure grinding wheel was validated.