金属薄肉管のしごき加工における限界条件 : 第2報,焼付き挙動に及ぼす潤滑条件の影響

概要

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An ironing test of aluminum cups has been carried out under various conditions of lubrication of the punch and die. The surface appearances of the ironed cups are divided into five classes according to the intensity and the amount of the damage caused by welding, i.e. rubbed surface (bright surface), scratched surface, gouged surface, surface with microtearing and surface with micro-tearing and-cracks. The extent of the damage has a good positive correlation with the frictional coefficient μ_d on the contact surface between the die and the material for each lubricating condition on the punch. As the viscosity of the lubricant on the punch increases, indicating the decrease of μ_p, the damage is reduced. μ_p is the frictional coefficient on the punch surface. By using two parameters of μ_d and μ_p, it is possible to know what class of surface appears. A bright surface has been obtained under the condition μ_d≦-0.51μ_p+0.13.
社団法人日本機械学会の論文
1986-05-25