Residual stress control method of hundred-meter heavy rail

A technology of residual stress and control method, which is applied in the direction of rolling mill control device, metal rolling, manufacturing tools, etc., can solve the problems of rail scratches, failure to meet the technical requirements of 100-meter rails, and difficult synchronization of rails, etc., and improve the pass rate , meet the standard requirements, and improve the effect of flatness

Inactive Publication Date: 2013-03-20
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

[0003] The traditional rail cooling bed itself can no longer meet the technological needs of the 100-meter rail and is facing elimination
The traditional rail cooling bed adopts a steel-drawn cooling bed, a DC motor drive system, and manual operation. It is difficult to achieve synchronization between the head and the tail of the rail, and it is easy to cause scratches on the rail.

Method used

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  • Residual stress control method of hundred-meter heavy rail
  • Residual stress control method of hundred-meter heavy rail
  • Residual stress control method of hundred-meter heavy rail

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Embodiment Construction

[0024] Large-arc pre-bending is used to optimize the process parameters, and the 100-meter rail is sent to the cooling bed after rolling. figure 1 As shown, in the actual production of steel rails, due to factors such as different furnace numbers of steel ingots and different rolling rhythms, the temperature of the cooling bed on the steel rails is also not the same. The temperature of the head is 850-930°C as the on-site condition, the on-site data and the photos of the on-site cooling effect are as follows Image 6 . The traversing process of the present invention is divided into two stages: translation and pre-bending. During translation, each traversing trolley starts and stops at the same speed at the same speed, pushes the 100-meter steel rail from the left side of the entrance roller table to the right side, pushes the 100-meter steel rail straight in a hot state, and corrects the starting point. The 100-meter rail is translated by 800-900mm to form a straight line, a...

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Abstract

The invention relates to a residual stress control method of a hundred-meter steel rail, which belongs to the fields of prebending deformation control and composite straightening deformation control processes of the hundred-meter steel rail and the like. The invention adopts a method with universal rolling, cooling after rolling and composite straightening, and large-radian prebending is adopted for the hundred-meter steel rail in the cooling process after rolling, so that when the steel rail is cooled to the room temperature, the chord height is controlled in the range of 30-40mm. By combination of optimized straightening deformation rules of an 8+1 multi-roll straightening machine and the control of the curvature before straightening, the residual stress control method effectively controls the residual stress of the bottom of the rail after the hundred-meter steel rail is straightened, the residual stress values of the bottom of the rail are averagely reduced by 70MPa, all the residual stress values are less than or equal to 250MPa, and the straightness of the steel rail is improved, so that the qualification rate of the steel rail is improved, and the standard requirement of the hundred-meter steel rail is met.

Description

technical field [0001] The patent of the invention relates to a method for controlling the residual stress of a 100-meter rail, which belongs to the fields of pre-bending deformation control, composite straightening deformation control technology, and the like. Background technique [0002] At present, the production steps of the 100-meter rail are usually used: universal rolling, post-rolling cooling, and compound straightening. The cooling process of the 100-meter rail after rolling is different due to the different cooling rates of different parts of the cross section, resulting in shrinkage deformation and phase change expansion. The time is different, so that the rail will repeatedly bend towards the rail head and the rail bottom during the cooling process, and finally the rail will have obvious bending deformation and residual stress after cooling, and the bending deflection has exceeded the size of the traditional cooling bed, which not only makes the Steel rail can't...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/00
Inventor 王建国陈林吴章忠李革刘宇雁包喜荣
Owner INNER MONGOLIA UNIV OF SCI & TECH
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