Extrusion roller hole pattern of high-frequency welded pipe rolling mill

Abstract

The invention discloses an extrusion roller hole pattern of a high-frequency welded pipe rolling mill. The extrusion roller hole pattern comprises a pair of extrusion side rollers I and extrusion siderollers II which are of the same structure and are oppositely mounted left and right, and a pair of extrusion upper rollers I and extrusion upper rollers II which are of the same structure and are mounted in parallel, wherein the extrusion side rollers I and the extrusion side rollers II sleeve side roller shafts; the extrusion upper rollers I and the extrusion upper rollers II sleeve an upper roller frame shaft; the hole pattern inner arc radius of the extrusion upper rollers I and the extrusion upper rollers II is R1; the hole pattern inner arc radius of the extrusion side rollers I and theextrusion side rollers II is R2; and R1 is greater than R2. The extrusion roller hole pattern has the characteristics that a certain deviation value exists between the hole pattern inner arc radius of the extrusion upper rollers and the hole pattern inner arc radius of the extrusion side rollers, so that two end openings at a welded joint of a steel pipe are in a flat state; the inner and outer layers of the steel pipe are uniformly heated and the welding quality is good; and when the steel pipe is subjected to a flattening experiment, the welded joint is not cracked and the quality of the steel pipe is good.

Description

technical field [0001] The invention relates to the technical field of high-frequency welded pipe production equipment, in particular to an extrusion roll pass of a high-frequency welded pipe rolling mill. Background technique [0002] The inner arc radius R1 of the extrusion upper roll of the existing high-frequency welded pipe mill is equal to the inner arc radius R2 of the extrusion side roll. When working, the steel pipe is close to the gap between the two extrusion upper rolls of the extrusion roll The joint is pointed peach-shaped, the end of the steel pipe is V-shaped, the heating inside and outside the steel pipe is uneven, the welding quality of the steel pipe is poor, and sometimes it cannot be welded. Contents of the invention [0003] The object of the present invention is to overcome the above-mentioned disadvantages and provide a high-frequency welded pipe mill extrusion roll pass. [0004] The technical solution adopted by the present invention to achieve t...

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Problems solved by technology

[0002] The inner arc radius R1 of the extrusion upper roll of the existing high-frequency welded pipe mill is equal to the inner arc radius R2 of the extrusion side roll. When working, the steel pipe is close to the gap between the two extrusion upper rolls of the extrusion roll The joint is pointed peach-shaped, the end of the steel pipe is V-shaped, the heating inside and outside the steel pipe is uneven, the welding quality of the steel pipe is poor, and sometimes it cannot be welded.

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