铝合金筒体侧向挤压润滑条件分析及润滑剂配比研究

Lubricating condition analysis of cylinder lateral extrusion and study on lubricant burden

润滑条件对铝合金筒体凸台侧向挤压成形有着重要影响。通过润滑条件对成形等效应变及凸模载荷影响的模拟、分析得出:当摩擦因数增大时,等效应变、筒壁变形和凸模平均载荷值增加,但凸模载荷波动减小。综合分析后确定:当摩擦因数为0.25时,具有较好的挤压效果。水基石墨润滑剂较适合于铝合金的等温挤压,为获得该摩擦因数,制取5种不同石墨含量的润滑剂,通过摩擦试验分析,确定摩擦因数。试验结果表明:当石墨含量为质量分数18%时,该润滑剂的摩擦因数为0.25,此配比较适合于铝合金筒体凸台的侧向挤压成形。

Lubrication condition of lateral extrusion for producing cylinders with boss plays an important role. The effect of lubrication conditions on equivalent strain during deformation has been analyzed, and the effect on punch load has been simulated. The results show that the equivalent strain, deformation of the cylinder wall and the average punch load has been increased while the friction coefficient is increased, but the fluctuation of punch load has been reduced. Through comprehensive analysis, the conclusion has been settled that the best extrusion result can be obtained at the friction coefficient being 0.25. The water-based graph- ite lubricant is suitable for isothermal extrusion of aluminum alloy. In order to obtain the fric- tion coefficient, 5 different lubricants with different content of graphite have been prepared. Through frictional experimental analysis the friction coefficient of every lubricant has been found. The experimental results show that the friction coefficient reached to 0.25 while the graphite content is 18%, and this burden ratio is suitable for lateral extrusion of aluminum alloy cylinder with boss.