Four-roll continuous pipe mill

Abstract

The invention discloses a four-roller continuous pipe rolling mill, which comprises a tunnel-type archway, rolling frames sequentially arranged along the central axis of the tunnel-type archway, roll assembly located in the rolling frame, and a device for driving the assembly and rotation of each roll. Transmission system, each rolling stand is equipped with four sets of roll assemblies, and each roll assembly is respectively connected to a set of roll gap adjustment devices for adjusting the roll gap. The roll gap adjustment devices are fixed on the tunnel-type archway. The rolling frame is also equipped with a roll changing device for the rolling frame to move back and forth along the central axis of the tunnel-type archway; the four rolls are driven independently, which can make the circumferential speed of the steel pipe consistent, the deformation uniform, and the hole The type is more closed, which improves the wall thickness accuracy of the product, reduces rolling defects, and expands the range of product specifications that can be rolled.

Description

technical field [0001] The invention belongs to the field of metal rolling equipment, and relates to a four-roller continuous pipe rolling mill. Background technique [0002] In the rolling production line of seamless steel pipes, the rolling mill is the main extension and deformation equipment for steel pipes; the existing four-high rolling mills are all used in sizing mills or stretching and reducing mills, and this rolling mill is mainly used to control the outer dimensions of steel pipes. Therefore, its The rolls are all fixed, and the roll gap cannot be adjusted, so it cannot be applied to the continuous pipe rolling mill that controls the wall thickness of the steel pipe; the existing continuous pipe rolling mill has such characteristics as wall thickness accuracy, rollable range, and defect rate. More stringent market demand, so there is an urgent need for a continuous pipe rolling mill that can adapt to market demand and has a higher level. Contents of the inventio...

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Problems solved by technology

[0002] In the rolling production line of seamless steel pipes, the rolling mill is the main extension and deformation equipment for steel pipes; the existing four-high rolling mills are all used on sizing mills or stretching and reducing mills, and this rolling mill is mainly used to control the outer dimensions of steel pipes. Therefore, its The rolls are all fixed, and the roll gap cannot be adjusted, so it cannot be applied to the continuous pipe rolling mill that controls the wall thickness of the steel pipe; the existing continuous pipe rolling mill has such characteristics as wall thickness accuracy, rollable range, and defect rate. More stringent market demand, so there is an urgent need for a continuous rolling mill that can adapt to market demand and has a higher level

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