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A control method of wall thickness accuracy of hot-rolled seamless steel pipe and roll pass

A technology of seamless steel pipe and control method, which is applied in the direction of rolling mill control devices, rolls, metal rolling, etc., can solve the problems of uneven wall thickness of seamless steel pipes, and achieve the advantages of reduced wall thickness unevenness, enhanced flow, and active lateral flow Effect

Inactive Publication Date: 2018-02-16
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the above problems, the object of the present invention is to provide a method that can alleviate the problem of uneven transverse wall thickness in the rolling process of seamless steel pipes, improve the wall thickness accuracy of seamless steel pipes, and solve the problem of wall thickness of small-diameter thick-walled seamless steel pipes. The problem of serious uneven thickness can improve the resource utilization rate of products

Method used

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  • A control method of wall thickness accuracy of hot-rolled seamless steel pipe and roll pass
  • A control method of wall thickness accuracy of hot-rolled seamless steel pipe and roll pass

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Embodiment Construction

[0012] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0013] figure 1 Shown is a schematic diagram of the roll pass. In the figure, the number 1 is the roll, and 2 is the outer circle of the steel pipe. The pass shape of the roll is a continuous smooth line. There is an eccentric distance e between the centroid O1 of the pass and the center O of the cross-section of the steel pipe. The steel pipe center O is the reference origin, and the characteristic dimensions of the pass mainly include dimension a, dimension b and dimension c, as well as angles α and β, and the sum of angles α and β is 120°. figure 1 Among them, t represents the amount of diameter reduction. In the range of α angle, t is a positive value. There is a reduction amount, and there is an interaction force between the steel pipe and the roll. In the range of β angle, t is a negative value. Clearance, no diameter reduction wit...

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Abstract

The invention relates to the field of seamless steel pipe production, and particularly to a wall thickness precision control method of hot rolled seamless steel pipes and roll pass. The invention aims to solve the technical issue that the wall thickness is nonuniform in the transversal direction during a seamless steel pipe rolling process. Novel rolling pass is designed to make the steel pipes be under the affect of rolling torques encircling axes of the steel pipes besides the roll force during a rolling process, the steel pipes can pivot the axes of the steel pipes because the steel pipes is under the affect of the rolling torques during the rolling process, so that the wall thickness precision in the transversal direction of the seamless steel pipes can be controlled. By adopting the wall thickness precision control method of the hot rolled seamless steel pipes and the roll pass, the defect of nonuniform transverse wall thickness of seamless steel pipes can be overcome during a rolling process, the quality and the rolling yield of the seamless steel pipes can be raised.

Description

technical field [0001] The invention belongs to the field of seamless steel pipe production, and in particular relates to a control method for wall thickness accuracy and a corresponding roll pass. Background technique [0002] The production process of hot-rolled seamless steel pipe is as follows: the initial round solid blank is perforated at high temperature to become a hollow capillary tube, and the capillary tube becomes a hollow tube with a certain size after continuous rolling with a semi-floating mandrel. Rolling by the diameter unit to become a seamless steel pipe that meets the size requirements (usually outer diameter and wall thickness). Among the three deformation processes, due to the fact that the production conditions cannot reach the ideal state, the finished steel pipe usually has uneven transverse wall thickness. The problem of uneven transverse wall thickness of steel pipes leads to the inability of mass-produced steel pipes to meet the use requirements,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/78B21B27/02
CPCB21B27/025B21B37/78
Inventor 唐华平姜永正
Owner CENT SOUTH UNIV
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