Totally closed guide device for oblique rolling three-roll piecing mill for pipes

Abstract

The invention discloses a totally closed guide device for an oblique rolling three-roll piecing mill for pipes. The totally closed guide device comprises a framework. A closed guide device is mountedon the framework and comprises a hollow cylinder, three grooves which are matched with the side walls of three rolls of the oblique rolling three-roll piecing mill are formed in the side walls of thecylinder, and pipe blanks can be arranged in the cylinder. The totally closed guide device for the oblique rolling three-roll piecing mill for the pipes has the advantages that tail triangles can be prevented when the pipe blanks are machined, pipe walls have uniform thicknesses, and the totally closed guide device is simple in equipment structure.

Description

technical field [0001] The invention relates to the technical field of pipe cross-rolling three-roll piercing, in particular to a fully enclosed guide device for a pipe cross-rolling three-roll piercer. Background technique [0002] With the development of high-end steel pipe technology, the requirements for steel pipes are more stringent, especially as the demand for alloy pipes and alloy pipes with poor plasticity increases. Although the three-roll piercing machine is very beneficial to the deformation of steel pipes with alloys and poor plasticity. However, the current three-roll piercing machine is only suitable for producing medium and thick-walled pipes, and cannot produce thin-walled pipes. Otherwise, it is easy to produce a tail triangle at the end of the tube blank, which will lead to product accidents and reduce the yield (d / s (diameter / wall thickness) ≤ 12, so thinner-walled finished products cannot be produced). The specification range of the product is greatly...

AI Technical Summary

Problems solved by technology

[0004] Produce thicker wall (d / s≤12); or the three-roll pipe mill adopts the method of twisting the roll before the end of the tube blank reaches the deformation zone of the roll, so that the opening of the roll increases instantly, allowing the waste tube to pass smoothly, but on site It is easy to cause the rear jam of the pipe and the wall thickness of the tail of the pipe is inconsistent with the wall thickness of the front of the pipe, which will bring difficulties to the next process; the three-roller pipe mill is equipped with 3 small-diameter pressure rollers at the entrance of the roll. When the tail of the pipe reaches In the deformation zone, start the pressure roller quickly to limit the formation of the tail triangle

[0005] Although the pipe produced by the above method can reduce the formation of the tail triangle, there are defects such as thick pipe wall or uneven pipe wall thickness or complex equipment structure, which cannot meet the technical requirements and increase the cost

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