Not isodiametric rollers in use for molding welded steel pipes

A technology of welding steel pipes and rolls, which is applied in the field of radial rolls, can solve the problems of accelerated roll wear, many parts of sliding friction, and affecting the surface quality of steel pipes, etc., and achieve the effects of reducing sliding friction, reducing running resistance, and overcoming scratches

Inactive Publication Date: 2007-12-26
葫芦岛市钢管工业有限公司
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Problems solved by technology

During the rolling process of the upper and lower rolls of precision forming and sizing, the working surface of the roll is in integral contact with the surface of the tube blank. The disadvantage of the overall contact is that there are many parts of sliding friction between the roll and the tube blank surface, which are prone to scratches. Affect the surface quality of the steel pipe; the sliding friction increases the running resistance of the tube billet, which increases the transmission power and wastes energy; the sliding friction also accelerates the wear of the working surface of the roll, reducing the service life of the roll

Method used

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  • Not isodiametric rollers in use for molding welded steel pipes

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Embodiment Construction

[0007] In the accompanying drawings, the unequal-diameter rolls for forming welded steel pipes of the present invention are composed of corresponding upper rolls and lower rolls. The shape and structure of the upper and lower rolls are the same, and only the drawings of the lower rolls are shown. The roll 1 is composed of a roll body 4, a roll hole 5 that can be fixedly connected with the roll shaft, and a working concave surface 2; the working concave surface 2 has a convex band 3 that is slightly raised relative to the concave surface, so that welded steel pipes can be formed. diameter rolls. The above-mentioned convex strip 3 slightly protruding relative to the concave surface is only different in tolerance relative to the concave surface in actual processing. When the forming rollers finish forming and sizing the round tube blank, the working surface of the tube blank and the roll only has real contact between the raised part and the tube blank without relative movement, a...

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Abstract

The invention discloses a welded steel pipe molding using diameter-inequality roller that is formed by upper roller and down roller which have the same shape and structure. The roller includes roller identity, roller hole and working concave. The invention could decrease the sliding friction of roller working surface and tube blank to avoid the scratches and improve the quality of the product. It also decreases running resistance of tube blank, and increases driving efficiency, saves electric power and prolongs useful life of roller.

Description

technical field [0001] The invention relates to a roll for rolling steel strips into welded steel pipes, in particular to a roll with unequal diameters for forming welded steel pipes. Background technique [0002] The production method of welded steel pipes using strip steel as raw material is: using continuous rolls with different sizes to roll the tube billet strip steel into a round tube, heating the edge of the round tube to a molten state by high-frequency heating, and then extruding Welded steel pipe products. The process of rolling the tube billet strip steel into a round tube tube steel tube needs to be rolled by multiple upper and lower rolls and finely formed and sized by the forming rolls. During the rolling process of the upper and lower rolls of precision forming and sizing, the working surface of the roll is in integral contact with the surface of the tube blank. The disadvantage of the overall contact is that there are many parts of sliding friction between t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B27/02
Inventor 宋树新孙宝杰
Owner 葫芦岛市钢管工业有限公司
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