Method and system for forming a recess in a tubular workpiece
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United States of America Patent
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Issued Date -
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app pub date -
Mar 3, 2005
filing date -
Oct 14, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A roller support block 10 supports rolling rollers (6.about.9) in four stages and moves in a guide hole (13) of a pipe holder (5) to sequentially bring the rolling roller into pressure contact with a pipe (2) held immovable by the pipe holder (5) through an aperture (35) made in the pipe holder (5). In this process, the first-stage rolling roller (6) first comes into rolling pressure contact with the pipe for preliminary shaping of a recess. Subsequently, the second-stage and third-stage rolling rollers (7, 8) advance the preliminary shaping to enlarge and deepen the recess. Finally, the fourth-stage rolling roller 9 finally shapes the recess to a first locking groove (3 or 4).
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