纳米颗粒SiCp/Al复合材料车削特性试验研究

针对纳米颗粒增强铝基（SiCp/Al）复合材料在航空航天领域的应用需求，采用试验的方法，研究不同刀具材料和不同刀具几何参数对切削加工纳米SiCp/Al复合材料加工表面粗糙度和切屑形貌的影响。试验结果表明，相同切削参数下，PCD刀具比硬质合金刀具能获得更低的已加工工件表面粗糙度，微崩刃的存在是导致硬质合金刀具加工时工件表面粗糙度升高的主要原因之一；增加刀具的锋利度能够获得较低的工件表面粗糙度，较大的主偏角表面粗糙度变化较剧烈；由于纳米颗粒增强相的不均匀分布和材料内部存在微裂纹，在切削时导致切屑呈不规则的锯齿状，基体的断裂模式是该现象产生的主要原因。文中的研究成果将为进一步分析纳米SiCp/Al复合材料的切削机理提供必要的试验基础。

Experimental study on turning SiCp/Al composites with nanometer-level reinforced particle

According to the application requirements of particle reinforced aluminum matrix composites in aerospace field, the effects of different tool materials and different tool geometric parameters on the machined surface roughness and chip morphology of aluminum matrix composites reinforced by nano-particles were studied by an experimental method. The experimental results show that machining by PCD tool can obtain better surface quality than carbide tool under the same cutting parameters, and the existence of micro chipping is one of the main reasons for the increase of surface roughness when machining with carbide tools; A lower workpiece surface roughness can be obtained by increasing the sharpness of the tool, and the surface roughness changed violently at a large approach angle; Due to the uneven distribution of nano-particle reinforced phase, an irregular sawtooth chip was formed, which is mainly caused by the fracture mode of the matrix. The research results of this paper will provide a necessary experimental basis for further analysis of the cutting mechanism of aluminum matrix composites reinforced by nano-particles.