The production mannered null volt/bolt hole of the splice plate for high strength volt/bolt

摘要

PROBLEM TO BE SOLVED: To supply a splice plate with unevenness having durability and a stable slip factor by applying high-speed low-cost laser heat treatment.;SOLUTION: This splice plate for friction-gripping a high-strength bolt has the chevron-shaped unevenness 2 concentric with a bolt hole 1, or linearly continuous near the bolt hole 1. The chevron-shaped unevenness part 2 is quenched such that hardness of projecting parts is higher than surface hardness near bottom parts of recessed parts.;COPYRIGHT: (C)2003,JPO