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    Method for manufacturing seamless pipe
    21.
    发明专利
    Method for manufacturing seamless pipe 有权
    制造无缝管的方法

    公开(公告)号：JP2010184280A

    公开(公告)日：2010-08-26

    申请号：JP2009031404

    申请日：2009-02-13

    Applicant: Sumitomo Metal Ind Ltd ,  住友金属工業株式会社

    Inventor： HARADA KOICHI ,  YAMAKAWA TOMIO

    IPC: B21C23/08 ,  C22C38/00

    CPC classification number: B21C23/085 ,  B21C23/002 ,  B21C23/32 ,  B21C25/02 ,  B21C29/00 ,  C10M7/00 ,  C10M103/00 ,  C10M2201/12 ,  C10M2201/123 ,  C10N2240/403 ,  C21D6/004 ,  C21D8/00 ,  C21D8/10 ,  C21D8/105 ,  C21D9/00 ,  C21D9/08 ,  C22C38/02 ,  C22C38/04 ,  C22C38/48 ,  C22C38/58 ,  F22B37/04 ,  F22B37/244

    Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a seamless pipe, capable of preventing a lateral broken flaw developed on the outer surface of a pipe top section, when performing hot extrusion using an extruded material low in deformation capability at a hot temperature.
    SOLUTION: The material to be extruded is heated to a temperature T [°C] satisfying a relationship of formula (1) or (2) in response to the outer diameter d
    0 [mm] and hot-extruded through a solid lubricating glass provided between to a die and the material. In the case of d
    0 0 /t)-10.135×In(d
    0 /d), and in the case of d
    0 ≥200, formula (2) is pressed by: T≤1,219+1.1487×A-7.838×In(t
    0 /t)-10.135×In(d
    0 /d), wherein A=L/V
    av ×1,000 [msec], V
    av =(V
    0 +V
    0 ×ρ)/2 [mm/sec], ρ=(t
    0 ×(d
    0 -t
    0 ))/(t×(d-t)), t
    0 represents the thickness [mm] of the extruded material, d represents the outer diameter [mm] of the extruded pipe, t represents the thickness [mm] of the outer diameter of the extruded pipe, L represents the length [mm] in the extruded direction of a die approaching section, and V
    0 represents a ram speed [mm/sec].
    COPYRIGHT: (C)2010,JPO&INPIT

    Abstract translation: 要解决的问题：提供一种无缝管的制造方法，其能够防止在管顶部的外表面上产生的横向断裂缺陷，当使用低变形能力的挤出材料进行热挤压时 热温 解决方案：根据外径d 0 [mm]，将要挤出的材料加热至满足式（1）或（2）的关系的温度T [℃] 并通过设置在模具和材料之间的固体润滑玻璃进行热挤压。 在d 0 <200的情况下，公式（1）表示为：T≤1,250+ 1.1487×A-7.838×In（t 0 / t）-10.135 ×（d 0 / d），在d 0 ≥200的情况下，式（2）被按下：T≤1,219+ 1.1487×A-7.838 ×In（t 0 / t）-10.135×In（d 0 / d）其中A = L / V < 毫秒]，V av =（V 0 V 0 ×ρ）/ 2 [mm / sec]，ρ=（t 0 ×（d 0 -t 0 ））/（t×（dt）），t 0 [mm]，d表示挤出管的外径[mm]，t表示挤出管的外径的厚度[mm]，L表示挤出管的挤出方向的长度[mm] 模具接近部分，V 0 表示冲压速度[mm / sec]。 版权所有（C）2010，JPO＆INPIT

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