Experimental study on grinding process of Al-Mg2Si aluminum matrix composites

IF 2.3 4区 工程技术 Q2 ENGINEERING, MECHANICAL
Hailong Sun, Qi Gao, Quanzhao Wang, Bintong Zhao, Dake Yun
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引用次数: 0

Abstract

As an aluminum-based reinforcement, Mg2Si particles have excellent properties such as high hardness, high melting point, and high elastic modulus compared with other reinforcements and are widely used in aerospace and automobile fields. However, there is little research on the cutting mechanism of this material. In order to explore the surface grinding mechanism of Mg2Si/Al composites, Grinding simulation of low-volume fraction Mg2Si/Al composites was carried out by ABAQUS, and the influence of different positions of matrix and particle removal on the surface quality of Mg2Si/Al composites was expounded. The plane reverse grinding test was carried out by using CBN (boron nitride) grinding wheel. The L16(43) orthogonal test and three groups of single factor tests were designed. The orthogonal results show that the linear velocity of the grinding wheel has the greatest influence on the surface roughness, and the feed rate and grinding depth are significantly smaller. The range analysis shows that the optimal grinding parameters are: vs = 35 m/s, vw = 0.75 m/min, ap = 0.015 mm. The regression equation for surface roughness was established by using MATLAB. The single factor results show that the surface quality is obviously improved by increasing the linear velocity of the grinding wheel and reducing the feed rate and grinding depth through the observation of the morphology of the processed specimen. The analysis results show that defects such as pits, protrusions, burrs, and a small amount of fish-scale-like on the machined surface are mainly caused by the linear velocity of the grinding wheel, the pulling force of the grinding wheel, and the adhesion of the debris. The defects such as particle micro-cracks, particle pull-out, and matrix cracking on the subsurface, are mainly caused by the compressive stress of the grinding wheel and the stress concentration of the particles. The research results have guiding significance for future composite material cutting research and actual cutting processing.
铝-Mg2Si 铝基复合材料研磨工艺的实验研究
作为一种铝基增强材料,Mg2Si 颗粒与其他增强材料相比具有高硬度、高熔点和高弹性模量等优异性能,被广泛应用于航空航天和汽车领域。然而,有关这种材料切削机理的研究却很少。为了探究 Mg2Si/Al 复合材料的表面磨削机理,利用 ABAQUS 对低体积分数 Mg2Si/Al 复合材料进行了磨削模拟,阐述了不同位置基体和颗粒去除对 Mg2Si/Al 复合材料表面质量的影响。使用 CBN(氮化硼)砂轮进行了平面反向磨削试验。设计了 L16(43) 正交试验和三组单因素试验。正交试验结果表明,砂轮线速度对表面粗糙度的影响最大,进给速度和磨削深度的影响明显较小。范围分析表明,最佳磨削参数为:vs = 35 m/s,vw = 0.75 m/min,ap = 0.015 mm。利用 MATLAB 建立了表面粗糙度的回归方程。单因素结果表明,通过观察加工试样的形态,通过提高砂轮线速度、降低进给速度和磨削深度,表面质量得到明显改善。分析结果表明,加工表面的凹坑、突起、毛刺、少量鱼鳞状等缺陷主要是由砂轮线速度、砂轮拉力、碎屑附着力等因素造成的。次表面的颗粒微裂纹、颗粒拔出、基体开裂等缺陷主要由砂轮压应力和颗粒应力集中引起。该研究成果对今后复合材料切削研究和实际切削加工具有指导意义。
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来源期刊
CiteScore
3.80
自引率
16.70%
发文量
370
审稿时长
6 months
期刊介绍: The Journal of Process Mechanical Engineering publishes high-quality, peer-reviewed papers covering a broad area of mechanical engineering activities associated with the design and operation of process equipment.
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