Symmetric hole-shaped curve cycle roll

Abstract

The invention discloses a symmetric hole-shaped curve cycle roll which comprises a roll (1); a hole shape (2) is arranged on the peripheral surface of the roll (1); the hole shape (2) is intercepted by a plane which is vertical to the axis of the roll (1) and is in a shape of a hole-shaped curve; the hole-shaped curve is sequentially divided into a forge rolled section, a finish rolled section, afinal rolled section and an air rolled section along a circumferential direction; the curve is symmetric with the plane which passes through the axis of the roll (1) and the middle point of the air rolled section; the radius of the hole shape is continuously reduced in the forge rolled section, remains unchanged in the finish rolled section, is continuously increased in the final rolled section and remains unchanged in the air rolled section, and an angular aperture (11) is continuously reduced in the forge rolled section, remains unchanged in the finish rolled section, is continuously increased in the final rolled section and remains unchanged in the air rolled section. The symmetric hole-shaped curve cycle roll has the advantages that: the hole-shaped curve is in a symmetric structure; when the forge rolled section is seriously worn and needs to be replaced, the roll only needs to change to another direction and the final rolled section is used for forge rolling; and the service life of the symmetric hole-shaped curve cycle roll is 1.3 to 1.5 times of that of an ordinary roll, and the installation is convenient.

Description

technical field [0001] The invention relates to a roll for rolling a seamless steel pipe, in particular to a periodic roll with a symmetrical hole shape curve. Background technique [0002] The periodic roll is the most important deformation tool in the periodic pipe rolling mill. In the work, two rolls are required to be used in pairs and rotate in opposite directions. During the process of one rotation of the rolls, the forging, finishing rolling, final rolling and stripping of the capillary must be realized. There are four processes. The pass curve of the roll along the axial section is composed of a circular arc and two straight lines tangent to it. The most serious wear of the roll is the forged strip when the periodic pipe rolling mill rolls the tube. The currently used periodic roll When the forging strip wears seriously, the entire roll has to be replaced, which increases the production cost of the steel pipe and causes a lot of waste of resources. Moreover, the peri...

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Problems solved by technology

[0002] The periodic roll is the most important deformation tool in the periodic pipe rolling mill. In the work, two rolls are required to be used in pairs and rotate in opposite directions. During the process of one rotation of the rolls, the forging, finishing rolling, final rolling, and stripping of the capillary tube must be realized. There are four processes. The pass curve of the roll along the axial section is composed of a circular arc and two straight lines tangent to it. The most serious wear of the roll is the forged strip when the periodic pipe rolling mill rolls the tube. The currently used periodic roll When the forging strip wears seriously, the entire roll has to be replaced, which increases the production cost of the steel pipe and causes a lot of waste of resources. Moreover, the periodic rolls currently used have directionality. When installing the upper and lower rolls, the direction of the rolls must be confirmed. , in order to meet the requirements of mutual cooperation, it is a little troublesome

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