摘要
以SiCp/Al为代表的金属基复合材料,由于其内部结构的局部不均匀性,传统的二维粗糙度参数指标描述、研究此类材质试件的表面形貌具有局限性,三维粗糙度参数能更全面、细致地反映试件表面特性。文章以三维参数表征SiCp/Al试件表面,采用正交试验将磨削工艺参数与三维参数(Sa、Sq、Ssk、Sku、Sbi、Sci、Svi)之间的关系透明化、数据化,如磨削参数对三维指标的影响权重、多位三维参数的综合指标。试件表面形貌较为复杂,既有砂轮磨粒在较软的铝基体上划过产生的沟槽,也有SiC颗粒被拔出,出现的凹坑,脱落或破碎的SiC微粒随砂轮拖动而产生的划痕;由于磨削热导致铝基体熔化,存在铝基体涂抹现象。表面形貌受磨削参数变化影响较为明显,发现不同的磨削参数对三维表面形貌指标影响的权重不同,揭示了砂轮目数对指标影响最突出,随着砂轮目数增加,权重从34%开始减小到13%,主轴转速、进给速度和磨削深度开始成为显著影响因素,均从最初22%的权重逐渐增加到29%。三维参数综合评价指标对应的最优磨削加工参数组合是Am为320目,Vs为4 000 r/min, Vf为20 mm/min,ap为20μm。
Due to the local inhomogeneity of the internal structure of metal matrix composites represented by SiCp/Al,the traditional two-dimensional roughness parameter index is limited to describe and study the surface topography of the specimens of such materials,while the three-dimensional roughness parameter can reflect the surface characteristics of the specimens in a more comprehensive and detailed 3Dway.In this paper,parameters were used to characterize the surface of SiCp/Al specimens.3DOrthogonal tests were used to make the relationship between grinding process parameters and parameters(Sa,Sq,Ssk,Sku,Sbi,Sci,Svi)transparent and data-based,such as the influence weights of 3D 3Dgrinding parameters on indexes and the comprehensive indexes of multiple parameters.The surface morphology of the specimen is complex,including grooves caused by grinding wheel abrasive particles scratching on the soft aluminum matrix,pits caused by SiC particles being pulled out,and scratches caused by falling or broken SiC particles dragging with the grinding wheel.Due to the melting of aluminum matrix caused by grinding heat,there is the phenomenon of aluminum matrix smearing.Surface topography is significantly affected by grinding parameter changes,and it is found 3Dthat different grinding parameters have different weights on the surface topography index,revealing that the number of grinding wheels has the most prominent influence on Sa index.With the increase of the grinding wheel mesh,the weight decreases from 34%to 13%,and the spindle speed,feed speed and grinding depth begin to become significant influencing factors,all gradually increasing from the initial weight of 22%to 29%.The optimal grinding parameter combination corresponding to the compre-hensive evaluation index of 3D parameters is Am 320#,Vs is 4000 r/min,Vf is 20 mm/min,and ap is 20μm.
作者
王少雷
张丽影
梁尤宇
邬海豹
WANG Shaolei;ZHANG Liying;LIANG Youyu;WU Haibao(Faculty of Mechanical and Energy Engineering,Guangdong Ocean University,Yangjiang 529500,CHN)
出处
《制造技术与机床》
北大核心
2024年第4期63-70,共8页
Manufacturing Technology & Machine Tool
基金
张小泉制造公司联合培养研究生示范基地(340205022201)
自由凸曲面工件直纹包络超声辅助磨削工艺方法研究(360302022303)。
关键词
表面形貌
三维粗糙度参数
正交试验
磨削工艺参数
影响权重
综合评价指标
surface topography
three-dimensional roughness parameter
orthogonal test
grinding process parameter
influence weight
comprehensive evaluation indicators
