发明名称 |
Method for producing double-wall tube with braided wires at its interface |
摘要 |
Provided is a method for producing a double-wall tube with braided wires at its interface in which the braided wires are interposed between an outer-wall and inner-wall blank tubes and then a drawing process is applied so as for the braided wires to be brought into close contact with the inner surface of the outer-wall tube and the outer surface of the inner-wall tube, the method comprising: polishing the inner surface of the outer-wall blank tube and the outer surface of the inner-wall blank tube so that a surface roughness thereof satisfies Ra<1.0 μm, followed by interposing the braided wires between the outer-wall and inner-wall blank tubes; performing a sinking drawing process so that the difference of the outer diameter of the resulting double-wall tube relative to a die bore diameter is 0.1 mm to 0.3 mm; and subsequently performing heat treatment. The double-wall tube produced is suitable as a heat-transfer tube. |
申请公布号 |
US9238258(B2) |
申请公布日期 |
2016.01.19 |
申请号 |
US201113878275 |
申请日期 |
2011.10.17 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
Hanada Takuya;Nakashima Takashi;Yokoyama Tetsuo;Kuroda Kouichi;Okui Tatsuya |
分类号 |
B21C1/22;B21C37/15;F28F1/00 |
主分类号 |
B21C1/22 |
代理机构 |
Clark & Brody |
代理人 |
Clark & Brody |
主权项 |
1. A method for producing a double-wall tube with braided wires at an interface thereof comprising:
polishing an inner surface of an outer-wall blank tube and an outer surface of an inner-wall blank tube so that a surface roughness thereof satisfies Ra<1.0 μm in terms of arithmetic average roughness (Ra), interposing the braided wires between the polished outer-wall and inner-wall blank tubes; performing a sinking drawing process to produce the double-wall tube with the braided wires being brought into close contact with the inner surface of the outer-wall tube and the outer surface of the inner-wall tube, wherein a difference of an outer diameter of the double-wall tube relative to a die bore diameter of a die used in the sinking drawing process is 0.1 mm to 0.3 mm; and subsequently performing heat treatment. |
地址 |
Tokyo JP |