发明名称 |
METHOD OF MANUFACTURING HAIRPIN CONFIGURED TUBES |
摘要 |
An integrally formed hairpin configured metallic tube, comprising two parallel leg portions (2, 2') of oblong cross-section connected together by an U-shaped bend portion (3) of substantially circular cross-section. A method of manufacturing hairpin tubes includes the steps of providing a tubular member with a substantially circular cross-section, bending said tubular member to an U-shaped hairpin tube with two parallel leg portions, and subsequent radial deformation of the leg portions to an oblong cross-section. |
申请公布号 |
DE3563263(D1) |
申请公布日期 |
1988.07.14 |
申请号 |
DE19853563263 |
申请日期 |
1985.03.12 |
申请人 |
NORSK HYDRO A/S |
发明人 |
KNOLL, RICHARD;CLAUSEN, EDVIN, LIST |
分类号 |
F28F1/00;B21C37/28;B21D7/00;F28D7/06;F28F1/02;(IPC1-7):F28D7/00 |
主分类号 |
F28F1/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|