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Characteristics of multiphase jet machining: A comparison with the absence of water
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2021-01-15 , DOI: 10.1016/j.jmatprotec.2021.117050
Yan Hu , Qingwen Dai , Wei Huang , Xiaolei Wang

Multiphase jet machining (MJM) is a recently developed surface texturing method that introduces water into a dry abrasive air jet. However, there are still some unknown issues with MJM, especially regarding the effects of adding water. Hence, we conducted a series of comparative studies when water was added (wet conditions) or not (dry conditions). Dimples and masked channels were machined on Si wafer and cemented carbide (YG6) surfaces to quantify the machining profile, erosion rate and roughness. Numerical simulations and high-speed cameras were used to help understand the particle erosion mechanisms. It was found that the inhaled water was completely atomized to form droplets and wrapped the abrasive particles; thus, the abrasives tended to follow their original trajectories without being deflected by the divergent airflow. This convergent effect could reduce the jet diameter and thus improve the machining resolution. The machining footprint was found to be reduced by 47.2 % at a jet distance of 13 mm compared to without water. Experimental and numerical results confirmed that under wet conditions, most of the particles would flow close to the machined surface, thus introducing a sliding grinding effect. The net result was a decrease in erosion ability but an improvement in surface roughness. Particularly, for the machining of sintered materials, the roughness could be improved more than 2.5 times.



中文翻译:

多相喷射加工的特点:无水比较

多相射流加工(MJM)是最近开发的表面纹理化方法,可将水引入干磨料射流。但是,MJM仍然存在一些未知的问题,尤其是在加水方面。因此,我们在添加水(潮湿条件)或不添加水(干燥条件)时进行了一系列比较研究。在硅片和硬质合金(YG6)表面上加工凹坑和掩膜通道,以量化加工轮廓,腐蚀速率和粗糙度。数值模拟和高速相机用于帮助理解颗粒腐蚀机理。发现吸入的水被完全雾化形成液滴并包裹了磨料颗粒。因此,研磨剂趋于遵循其原始轨迹而不会因发散的气流而偏转。这种会聚效应可以减小射流直径,从而提高加工分辨率。发现与没有水相比,在13毫米的喷射距离下,加工足迹减少了47.2%。实验和数值结果证实,在潮湿条件下,大多数颗粒将流向机加工表面附近,从而产生滑动研磨效果。最终结果是腐蚀能力降低,但表面粗糙度提高。特别地,对于加工烧结材料,可以将粗糙度提高2.5倍以上。大多数颗粒将流向加工表面附近,从而产生滑动研磨效果。最终结果是腐蚀能力降低,但表面粗糙度提高。特别地,对于加工烧结材料,可以将粗糙度提高2.5倍以上。大多数颗粒将流向加工表面附近,从而产生滑动研磨效果。最终结果是腐蚀能力降低,但表面粗糙度提高。特别地,对于加工烧结材料,可以将粗糙度提高2.5倍以上。

更新日期:2021-01-22
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