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    • 1. 发明授权
    • Method and apparatus for manufacturing hollow steel bars
    • 中空钢筋制造方法及装置
    • US5699690A
    • 1997-12-23
    • US661700
    • 1996-06-11
    • Munekatsu FurugenShotaro HamazakiNorimasa KameokaAtsuhumi Okamoto
    • Munekatsu FurugenShotaro HamazakiNorimasa KameokaAtsuhumi Okamoto
    • B21B19/02B21B45/00B21B19/04
    • B21B19/02B21B45/004
    • A method of manufacturing hollow steel bars comprising the steps of preparing a hollow billet with the dimensions meeting a condition expressed by the following formula (1) by piercing a steel billet with a piercer after heating, inserting a mandrel as an inner surface sizing tool into a hollow billet, and then rolling the hollow billet on a cross-rolling mill having three rolls arranged around a pass line to provide plastic working for reduction of the outside diameter and adjustment of the wall thickness of the hollow billet so as to meet a condition expressed by the following formula (2), and a manufacturing apparatus comprising an electric resistance heating unit, the piercer, and the cross-rolling mill, wherein t.sub.0 /d.sub.0 >0.1 (1) Rt
    • 一种制造空心钢筋的方法,包括以下步骤:通过在加热之后用穿孔机刺穿钢坯,将尺寸满足下列公式(1)表示的条件的中空坯料,将作为内表面施胶工具的心轴插入 中空坯料,然后在具有三根辊的交叉轧制机上轧制中空坯料,其中轧辊布置在通行线周围,以提供用于减小外径的塑性加工并调整中空坯料的壁厚以满足条件 由下述式(2)表示的制造装置,以及包括电阻加热单元,穿孔器和交叉轧机的制造装置,其中t0 / d0> 0.1(1)Rt <0.55Rd(2)其中t0 =壁 横向轧制前空心钢坯的厚度d0 =横轧前中空钢坯的外径Rt =壁厚减少量(%),Rt =(t0-t1)/ t0x100 Rd =外径减少量(%),Rd =(d0-d1 )/ d0x100 t1 =壁厚h 轧制后的二氧化碳棒d1 =横向轧制后的中空钢筋的外径通过上述方法和系统,外径小,厚度约20-70mm的长而厚壁的中空钢筋 直径,0.25-0.40的壁厚对外径比(t1 / d1)和2-6μm的长度可以以高尺寸精度和低成本制造。