摘要
Due to the biological risks of using the conventional lubricants,the vegetable oils have been considered nowadays.Besides,to improve the tribological properties of the vegetable oils in various applications like metal forming processes,nanoparticles have been used as additives.This research evaluated the lubrication performance of the Al2O3 and TiO2 nanoparticles dispersed in rapeseed oil during the parallel tubular channel angular pressing (PTCAP) process.The experimental PTCAP tests have been fulfilled under three lubrication conditions and the comparison between the PTCAP processed tubes has been performed in terms of the maximum forming force,surface roughness,and microhardness.The experimental results indicate that adding the mentioned nanoparticles has caused at least a 50% reduction in the maximum deformation load.Moreover,a remarkable decrement in the surface roughness of the formed tubes has been obtained.
由于使用传统润滑剂存在生物风险,植物油已成为人们关注的焦点。此外,为了提高植物油在金属成型工艺等各种应用中的摩擦性能,纳米颗粒被用作添加剂。本文研究了平行通道转角挤压(PTCAP)过程中分散在菜籽油中的Al2O3和TiO2纳米颗粒的润滑性能。在三种润滑条件下进行了PTCAP实验,并在最大成形力、表面粗糙度和显微硬度方面对PTCAP加工通道进行了比较。实验结果表明,加入上述纳米颗粒可使最大变形力至少降低50%。此外,成型通道的表面粗糙度明显降低。
