Method for producing a seamless steel pipe and rolling mill for performing the method

用于制造无缝钢管的方法和用于实施该方法的轧机

Abstract

The invention relates to a method and a rolling mill for producing a seamless steel pipe in a continuous rolling process, where semi-finished material is first formed into a hollow block (8) in a rotary rolling mill, said block then being rolled in a multi-tooled continuous rolling mill (1) over a previously inserted mandrel (10) to form a tube blank (9), wherein the mandrel (10) receiving the hollow block and held by a mandrel holding and transporting device (5) disposed on the entry side is fed into the continuous rolling mill (1) and is transported back to the entry side after the tube blank has been rolled off of the mandrel (10) on an extracting rolling mill (4) connected downstream of the continuous rolling mill. An aim of the invention is to allow high production rates at the same product quality, particularly at a low drop in the temperature of the tube blanks. The aim is achieved in that the mandrel (10) with the tube blank (9) is released by the entry-side mandrel holding and transporting device (5) after exiting the last tool (2.n) of the continuous rolling mill (1) and thus is transferred to an accompanying second mandrel holding and transporting device (6) connected downstream and held by the same until the tube blank (9) is rolled off by means of the extracting rolling mill (4).
本发明涉及用于在连续的轧制过程中制造无缝钢管的一种方法和一种轧机,其中首先在穿孔轧机中使得坯料成型为空心坯(8),然后在多机架的连轧机(1)中在事先穿入的芯棒(10)上将所述空心坯轧制成空心管坯(9),其中将承载空心坯的、由设置在入口侧的芯棒保持和输送装置(5)夹持的芯棒(10)输送给连轧机(1),当空心管坯在连接于连轧机之后的脱管机(4)上已脱离于芯棒(10)之后,将所述芯棒输送回到入口侧。目的在于,特别是在空心管坯的温度下降较少的情况下,能使得轧件产量大,同时保持产品质量恒定。为此,使得带有空心管坯(9)的芯棒(10)在从连轧机(1)的最后的机架(2.n)中出来之后被入口侧的芯棒保持和输送装置(5)松开,进而随之被传递给后置的第二芯棒保持和输送装置(6)并被保持住,直至空心管坯(9)通过脱管机(4)而脱管。

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    CN-103442819-ADecember 11, 2013丹尼尔和科菲森梅克尼齐有限公司用于在连续多机架轧机中轧制管的工艺
    CN-103442819-BNovember 25, 2015丹尼尔和科菲森梅克尼齐有限公司用于在连续多机架轧机中轧制管的工艺