铝板带冷轧过程中磨损影响因素及磨损作用机制研究

Influencing Factors on Wear and Wear Mechanism in Cold Rolling of Aluminum

轧后铝材表面磨损量是影响铝材轧制过程的重要因素,脱落的铝粉恶化产品表面质量、影响轧制效率.本文选用不同的添加剂配制轧制油,对铝板材进行冷轧试验,重点研究添加剂种类、铝材原始表面质量、轧制压下率三方面对铝材表面磨损性能及磨损机制的影响.结果表明:双组分添加剂轧制油中油性剂在金属表面吸附成膜,犁削磨损现象较无润滑和纯基础油轧制有明显改善,轧后铝材表面磨损量小;轧件轧前表面粗糙度大,轧辊对轧件微凸体的碾压作用加剧,被碾压下来的大量铝粉成为轧辊和轧件外的"第三体",造成磨粒磨损加剧;化学磨损和犁削磨损同时存在于轧制过程中,油膜厚度较大时,前者是主要磨损机制;反之,后者起主导作用.

The wear of aluminum surface after rolling is an important index for rolling of aluminum.Aluminum debris generated in rolling deteriorated the product quality and lower the rolling efficiency.In this paper,different additives were selected to confect oils that were used in cold rolling of aluminum.The influences of three factors including additive,the original surface quality of the aluminum and rolling reduction were researched.The abrasive wear of aluminum was mild when composite additive were used in rolling oils.The surface of unrolled aluminum was characterized by many grooves.These grooves were compacted and as a result,a large number of aluminum debris generated and became ＂the third body＂.These debris enhances abrasive wear of aluminum.Chemical wear and ploughing wear can be found in the rolling process.When oil film was thick,the former played a dominant role.When it was thin,the latter was the predominated one.