抄録
A pyramidal headed punch is pushed through sheet metal to form petal flanges, which are subsequently used for eyelet tab staking of the lap joints. The present report announces the sequel to the report which appeared in the previous publication. The crushing strength of the joint is mostly determined in a similar way of thinking at lip flanges. But petal flanges seem to have less crushing strength compared with lip flanges. Such results are wholly attributed to the fixed position of petals due to the force form outside, and/or the change in the internal edge shape of the eyelet under the staking. From the viewpoint of joint efficiency, it is one of easiest methods for permanently assembling light parts.
