METHOD FOR PRODUCING SEAMLESS TUBES
    93.
    发明申请
    METHOD FOR PRODUCING SEAMLESS TUBES 有权
    生产无缝管的方法

    公开(公告)号:US20120047981A1

    公开(公告)日:2012-03-01

    申请号:US13205985

    申请日:2011-08-09

    Abstract: Provided is a method for producing a seamless tube, in which after a starting material to be extruded has been heated to a heating temperature T [° C.] satisfying the relationship of Formula (1) or Formula (2) depending on the outside diameter d0 [mm] thereof, the starting material is hot extruded by providing a solid lubricating glass between the starting material to be extruded and a die, whereby a transverse flaw on the outer surface in the top portion of tube can be prevented when hot extrusion is performed by using a starting material for extrusion having low deformability at high temperatures. When d0

    Abstract translation: 本发明提供一种无缝管的制造方法,其中待挤出原料已经被加热至满足式(1)或式(2)的关系的加热温度T [℃],取决于外径 d0 [mm],通过在待挤出的起始材料和模具之间提供固体润滑玻璃来热原料,由此当热挤出为热挤压时,可以防止管顶部的外表面上的横向缺陷 通过使用在高温下具有低变形性的用于挤出的原料进行。 当d0 <200时,T&nlE; 1250 + 1.1487×A-7.838×ln(t0 / t)-10.135×ln(d0 / d)。 。 。 (1); 当d0≥200时,T&nlE; 1219 + 1.1487×A-7.838×ln(t0 / t)-10.135×ln(d0 / d)。 。 。 (2),其中A = L / Vav×1000 [昆虫。 Vav =(V0 + V0×&rgr)/ 2 [mm / sec],&rgr; =(t0×(d0-t0))/(t×(d-t)),t0:起始材料的壁厚 挤出成形后的挤出长度[mm],d:挤出管的外径[mm],t:壁厚[mm],L:挤出方向的模具的接近部分长度[mm],V0:冲头速度[mm / sec] 。

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