| 摘要 |
Sheet material pieces are riveted together by punching a hole in the pieces with a rivet driven through them and into an oversize female die, which is then moved to move the penetrated pieces towards the head of the rivet. The rivet is further advanced so that the end which has penetrated the pieces is flattened and radially enlarged against an anvil. This radially enlarged end may be withdrawn from the oversize female die.
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