发明名称 Method of and rolling mill for making seamless steel pipe
摘要 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).
申请公布号 US8904839(B2) 申请公布日期 2014.12.09
申请号 US200912679057 申请日期 2009.07.14
申请人 SMS Meer GmbH 发明人 Hoeffgen Walter;Theelen Norbert
分类号 B21B19/04;B21B25/02;B21C45/00;B21B17/04;B21B17/14;B21B23/00 主分类号 B21B19/04
代理机构 代理人 Wilford Andrew
主权项 1. A method of making a seamless steel pipe from a hollow block, the method comprising the steps of sequentially: engaging a mandrel through the block; gripping the mandrel relative to a rolling direction upstream of the block with an upstream gripper and displacing the mandrel and the block downstream by the upstream gripper in the rolling direction through a multiple-stand continuous rolling mill so as to convert the hollow block into a tube blank until the tube blank exits the continuous rolling mill in the rolling direction, all while still gripping the upstream end by the upstream gripper upstream of the continuous rolling mill; gripping the mandrel downstream of the continuous rolling mill and upstream of the tube blank with a downstream gripper; with the upstream gripper upstream of the continuous rolling mill, releasing the mandrel from the upstream gripper and displacing the mandrel and tube blank downstream to an extracting mill by the downstream gripper; pulling the tube blank off the mandrel with the extracting mill while holding the mandrel against synchronous downstream movement with the tube blank by the downstream gripper downstream of the continuous rolling mill; and transporting the mandrel back upstream for engagement through another hollow block.
地址 Moenchengladbach DE