| 摘要 |
A self-piercing tubular fastener ( 13 ) is applied to a workpiece ( 9, 11 ) by means of a setting die ( 1 ) which is formed with a radially inner cavity ( 17 ) and a radially outer cavity ( 5 ) surrounding the radially inner cavity such that a first part of the material displaced as the fastener ( 13 ) penetrates the workpiece flows into the radially inner cavity in the setting die whilst a second part of the displaced material flows into the radially outer cavity.
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