发明名称 |
High-pressure metal pipe with connection head, method of forming the head and connection washer for the connection head |
摘要 |
A connection head at a connection end of a thick wall steel pipe has an outer end face formed as a truncated cone or a truncated sphere. A lower neck portion is formed at the rear of the connection head and has a cylindrical outer surface and a taper to the outer surface of the pipe. A connection washer covers the lower neck portion of the connection head. A shallow gently sloping annular groove is produced inside the connection head as a result of a press forming. The above structure can prevent fatigue fracture due to stress concentration at the annular groove inside the head and sticking of a nut to the washer due to excessive tightening torque.
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申请公布号 |
US2002005642(A1) |
申请公布日期 |
2002.01.17 |
申请号 |
US20010866127 |
申请日期 |
2001.05.25 |
申请人 |
KUSANAGI RYUICHI |
发明人 |
KUSANAGI RYUICHI |
分类号 |
B21K21/12;F16L19/025;F16L19/04;(IPC1-7):F16L17/00 |
主分类号 |
B21K21/12 |
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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