Geometric model of new elongater for skew rolling tubular products

Abstract

The present invention relates to hot-rolled pipe elongation technique. Said technique can be directly used in skew-rolled pipe elongation equipment. Said invention provides a new geometrical model of pipe material elongator. It is basically characterized by that its rolls are arranged according to convergent form, namely, the cone angle Psi is less than O, in the coordinate system oxyz, the offset amount yo is not equal to O, and its feed angle beta and the offset amount yo can not be identical in size. Besides, said invention also provides four sets of equations, and utilizes them to make optimization calculation so as to obtain the invented geometrical model of skew-rolled pipe material elongator.

Description

technical field

[0001] The invention relates to a hot-rolled pipe extension technology, which can be directly applied to cross-rolled pipe extension equipment. Background technique

[0002] Modern common cross-rolled pipe extension machines are:

[0003] 1) Diescher pipe rolling mill

[0004] 2) Assel pipe rolling mill (three-roll cross-rolling extension machine)

[0005] 3) ACCU ROLL pipe rolling machine

[0006] 4) Three-roll skew rolling planetary pipe mill (PSW)

[0007] It is inevitable that any cross-rolling process will produce metal "bulging" in the deformation zone. In order to alleviate this "bulging" and increase the rolling speed, people have made a lot of discussions over the years, but with little success. Under the development of oblique-longitudinal rolling pipe rolling mill (such as Diescher pipe rolling mill, ACCU ROLL pipe rolling mill), this type of pipe rolling mill not only has a huge mechanical structure, but also causes adjustment of the rolling m...

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