両面しごき限界に及ぼす加工条件の影響

― 両面しごき加工の研究 II ―

抄録

A both-sided ironing process can iron the inner and outer surfaces of a can at the same time using inner and outer dies. The limiting ironing ratio of the both-sided ironing process is lower than that of the one-sided ironing process. In the case of an ironing die profile radius of 10mm, the limiting ironing ratio of the both-sided ironing process is 27%, and that of the one-sided ironing process is 36%. This characteristic depends on the difference in the forming mechanism. The limiting ironing ratio of the both-sided ironed can is found to be influenced by the combination of different die profiles for inner and outer dies, the lubrication on both sides of the can. The limiting ironing ratio increases with increasing the profile radius of the inner die. The limiting ironing ratio is slightly affected more by the lubrication of the outer side rather than that of the inner side. The limiting ironing ratio decreases when the outer side is not lubricated.