涂层刀具低温铣削SiC_(p)/Al复合材料表面质量研究

Surface Quality of SiC_(p)/Al Composites Milled by Coated Tools at Low Temperature

在加工过程中,相反的两相特性增加了SiC_(p)/Al复合材料加工难度,难以获得良好的表面质量。为了提高其切削性能,本文开展20vol%SiC_(p)/Al复合材料铣削加工试验研究,比较常温和低温条件下TiAlN涂层和TiAlSiN涂层两种铣刀的切削性能。结果表明,在低温条件下,两种刀具的切削力增加,铣削后表面铝基体的开裂及剥落等缺陷均显著改善,加工表面损伤减小且粗糙度降低,低温铣削能获得更好的表面质量。此外,在常温与低温条件下TiAlSiN涂层比TiAlN涂层铣刀的切削力小,低温条件下TiAlSiN涂层铣刀表面完整性和切屑形貌优于TiAlN涂层铣刀。

In the machining process,the opposite two-phase characteristics increase the machining difficulty of SiC_(p)/Al composites,and it is difficult to obtain good surface quality.In order to improve its cutting performance,the milling experiments of 20 vol%SiC_(p)/Al composites were carried out to compare the cutting performance of TiAlN coated and TiAlSiN coated milling cutters at room temperature and low temperature.The results show that when milling at low temperature,the cutting force of the two tools increases,and the surface defects such as aluminum matrix cracking and spalling are significantly improved,and the machined surface damage and roughness are reduced.Low temperature milling can obtain better surface quality.In addition,the cutting force of TiAlSiN coated milling cutters is lower than that of TiAlN coated milling cutters under normal temperature and low temperature.The surface integrity and chip morphology of TiAlSiN coated milling cutters are better than those of TiAlN coated milling cutters under low temperature conditions.