Hot-rolled seamless steel pipe cross-rolling mill front and back mandrel fully supported rolling equipment

Abstract

The invention belongs to the technical field of metal press working (steel rolling), and relates to a steel rolling process for rolling deformation of a seamless steel pipe slant mill, so that a rolling deformation process is comprehensively improved, the deformation stability is improved, and problems in a skew-rolling seamless steel pipe production process are solved, that is, a rolling process method, equipment and technology are provided for overcoming quality defects of spiral ducts in the inner surface of a steel pipe and improving the quality. The core scheme is that a slant mill foreground and background mandrel adopts the full-supporting rolling process, equipment and technology. During skew-rolling deformation, the rolling mandrel is limited and clamped at an inlet of the slant mill and an outlet end at the same time in the rolling process, the mandrel is completely in a controlled and retrained state in the rolling process, and radial displacement of the mandrel in the skew-rolling process is reduced to the maximum extent. The effect of improving the rolling stability is achieved through cooperation of skew-rolling roller form design and rack novel structural design, the spiral ducts in the skew-rolling inner surface are eliminated or decreased to the maximum extent, and the quality of steel pipe products is improved. The skew-rolling process level of the seamless steel pipe is increased, and application and development of a skew-rolling process are promoted.

Description

technical field [0001] The invention belongs to the technical field of metal pressure processing (steel rolling). For the production and manufacture of seamless steel pipes, steel pipe skew rolling mills (including two-roll, three-roll skew rolling mills and roll-type rotary pipe expanders) with mandrel rolling are used to improve the stability of steel pipe rolling deformation, thereby comprehensively improving the cross-rolling mill. The solution for the purpose of seam steel pipe product quality. Background technique [0002] In addition to hot extrusion, the forming method of seamless steel pipe is hot rolling. Hot-rolled seamless steel pipe can be divided into longitudinal rolling and cross rolling. Longitudinal rolling means that the deformed metal mainly flows along the rolling direction, and the metal workpiece at the exit of the rolling mill moves in a straight line, while the metal exit of the cross-rolled workpiece moves in a spiral manner. [0003] Compared wi...

AI Technical Summary

Problems solved by technology

Since the mandrel is only supported at the front of the extension machine through the support section at the back end of the mandrel, this unstable swing increases with the increase in the length of the blank tube and the movement of the mandrel, and the greater the swing, the more intuitive this is. Stable shaking is an important factor that leads to the quality defect and precision drop of the inner surface of the steel pipe during the forming process

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