发明名称 |
MEJORAS A UN METODO PARA PREFATIGAR MECANICAMENTE UN APARATO TUBULAR |
摘要 |
A method of prestressing a tubular apparatus having coaxial inner and outer tubes which are connected to each other at axially spaced locations comprises, after the inner and outer walls are connected to each other and the tube is heat-treated or otherwise processed, reducing the diameter of the outer wall so that the outer wall is elongated. The elongation of the outer wall establishes a prestressed condition between the inner and outer walls, with the inner wall under tension and the outer wall under compression. The reduction in diameter of the outer wall can be accomplished by using a roll extrusion machine, a tube reducer or a draw bench. |
申请公布号 |
MX158970(A) |
申请公布日期 |
1989.04.04 |
申请号 |
MX19830198576 |
申请日期 |
1983.08.31 |
申请人 |
THE BABCOCK & WILCOX COMPANY |
发明人 |
RICHARD L. HOLBROOK;DEAN L. MAYER |
分类号 |
B21C37/06;B21C37/15;B21D41/04;B21D51/02;C21D7/02;C21D8/06;E21B17/00;E21B36/00;F16L9/18;F16L58/08;F16L59/06;(IPC1-7):B23P9/00 |
主分类号 |
B21C37/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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