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    • 9. 发明授权
    • Plug for cold drawing and method for manufacturing of metal pipe
    • 冷拔插头及金属管制造方法
    • US08074482B2
    • 2011-12-13
    • US12691503
    • 2010-01-21
    • Tatsuya OkuiKouichi KurodaTadashi Kawakami
    • Tatsuya OkuiKouichi KurodaTadashi Kawakami
    • B21C1/24
    • B21C3/16B21C1/24
    • A plug 1 includes a first columnar portion 20, a tapered portion 30, and a second columnar portion 40. The first columnar portion 20 has an outside diameter D1. The second columnar portion 40 has an outside diameter D2 which is larger than the outside diameter D1. The tapered portion 30 is formed between the first columnar portion 20 and the second columnar portion 40. The tapered portion 30 has a tapered surface 31 provided with an outside diameter which is gradually increased from the first columnar portion 20 to the second columnar portion 40, and an axial direction length L. The outside diameters D1 and D2, and the axial direction length L meet the following expressions (1) to (4): 0.25≦ρ≦2.00  (1), 0.06≦L/D2≦0.8  (2), L/D2≦0.3×ρ+0.575  (3), and L/D2≧0.1×ρ  (4) where ρ=(D2−D1)/D1×100. Therefore, the cold drawing plug according to the present invention can reduce the tensile residual stress on the outer surface of a metal pipe after the cold drawing.
    • 插头1包括第一柱状部分20,锥形部分30和第二柱状部分40.第一柱状部分20具有外径D1。 第二柱状部分40具有比外径D1大的外径D2。 锥形部分30形成在第一柱状部分20和第二柱状部分40之间。锥形部分30具有锥形表面31,其具有从第一柱状部分20逐渐增加到第二柱状部分40的外径, 外径D1和D2以及轴向长度L满足以下公式(1)〜(4):0.25≦̸&rgr;≦̸ 2.00(1),0.06≦̸ L / D2&nlE ; 0.8(2),L / D2≦̸ 0.3×&rgr; +0.575(3),L /D2≥0.1×&rgr; (4)其中&rgr = =(D2-D1)/ D1×100。 因此,根据本发明的冷拔塞可以减少冷拔后的金属管的外表面的拉伸残余应力。