Four-roller mandrel pipe mill

Abstract

The invention discloses a four-roller mandrel pipe mill which comprises a tunnel type memorial archway, rolling racks arranged along the central axis of the tunnel type memorial archway in sequence, roller fittings located inside the rolling racks and a transmission system used for driving all the roller fittings to rotate. Each mill rack is provided with four sets of roller fittings, all the roller fittings are respectively connected to a set of roller clearance adjusting device used for adjusting the roller clearance, the roller clearance adjusting device is fixed on the tunnel type memorial archway, and each rolling rack is further provided with a rolling changing device used for allowing the corresponding rolling rack to move back and forth in the central axis direction of the tunnel type memorial archway. Four rollers are driven independently, the speeds in the peripheral direction of steel pipes are good in consistency, deformation is even, a hole pattern is sealed better, the wall thickness precision of products is improved, rolling defects are reduced, and the specification range of products capable of being rolled is enlarged.

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...

AI Technical Summary

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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