mushrooming该如何理解(关于螺栓)? The construction of staked and upset screws is to consist of an interference fit between nut and bolt causing uneasy turning of the screw.This shall be accomplished by use of a center punch applied to the end of a bolt after assembly, mismatching of nut and bolt thread or equivalent. It is probably referring to mushrooming. after a bolt and nut are assembled a strong wack with a center punch right in the center of the bolt will cause the bolt to expand in diameter around the tip of the screw thus making the threads too large for the nut. Thus the nut cannot be taken off.查看更多3个回答 . 5人已关注