发明名称 |
A MECHANICAL PIPE-END EXPANDER AND A METHOD OF MANUFACTURING SEAMLESS STEEL PIPE |
摘要 |
The present invention provides a mechanical pipe-end expander comprising a cone and a die having tapered wedge bodies whose outer radius is larger in a direction to a pipe-recess end from a pipe-mouth end, wherein a pipe-end zone is expanded by a wedge effect of the die, which results from a procedure that the cone and the die are inserted together into the pipe-end zone to be expanded, and that then only the cone is axially drawn outwards leaving the die within the pipe-end zone. A seamless steel pipe with an expanded pipe-end zone is manufactured by applying a mechanical pipe-end expander comprising a die having tapered wedge bodies whose outer radius is larger in a direction to a pipe-recess end from a pipe-mouth end. The resulting seamless steel pipe has satisfactory pipe-end dimensional accuracy, and exhibits characteristics with excellent field welding workability.
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申请公布号 |
CA2644176(C) |
申请公布日期 |
2011.05.10 |
申请号 |
CA20072644176 |
申请日期 |
2007.03.09 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD. |
发明人 |
ARITA, TSUTOMU;AKIYAMA, MASAYOSHI;KURODA, KOUICHI;OKUI, TATSUYA |
分类号 |
B21D41/02;B21C37/16 |
主分类号 |
B21D41/02 |
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