内面面取りプレス穴付きSPCE鋼板とA5083アルミニウム板の摩擦攪拌成形による機械的接合

抄録

In recent years, with the widespread application of lightweight and high-strength materials in automobiles, mechanical joining technologies for dissimilar materials have been attracting attention. This paper presents a new mechanical joining technique for steel-aluminum alloys, which combines stamping and friction stir forming. First, an SPCE steel sheet was pierced by stamping with a chamfering punch to prepare a hole and placed against a backing plate after being turned over. Next, an A5083 aluminum alloy plate was put on it. Then, a rotary tool was plunged into the aluminum plate to cause the aluminum alloy to flow into the hole in the steel. A mechanical joint was performed thereby due to the tilt wall of the hole. The strength of the joint was associated with the cross-sectional shape of the hole, and it varies with punch-die clearance in the stamping. The relationship between the punch-die clearance, tensile-shear strength and cross-tensile strength was reported in the paper.