Method for Residual Stress Control of 100-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 that cannot meet the technical requirements of 100-meter rails, the difficulty of synchronizing the rails, and scratches on the rails, etc., and meet the standard requirements , Improve flatness, and improve the pass rate

Inactive Publication Date: 2011-12-21
INNER MONGOLIA UNIV OF SCI & TECH
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AI Technical Summary

Benefits of technology

This technology helps improve the quality of rails used for transportation systems like trains or tunnels. By calculating how much force it applies when curling them under specific conditions, this can help prevent cracks from forming over time due to changes made along their length caused by external factors such as temperature variations. Additionally, these technical improvements result in improved performance compared to older methods while maintaining good appearance characteristics.

Problems solved by technology

This technical problem addressed by this patents relates to improving the performance and lifespan of railway transport systems such as electric power lines or gas pipelines for use with high temperature environments like those found at temperatures above 600°C (approximately 260 °F). These materials require specialized equipment designed specifically for their intended purpose. However, these conventional methods involve multiple stages of heat treatment followed by curling processes, leading to significant changes overtime caused by thermal contractions and other factors. Additionally, there may be issues where cracks form within certain areas along specific portions of the material being worked upon.

Method used

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  • Method for Residual Stress Control of 100-meter Heavy Rail
  • Method for Residual Stress Control of 100-meter Heavy Rail
  • Method for Residual Stress Control of 100-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, and

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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

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Claims

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Application Information

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Owner INNER MONGOLIA UNIV OF SCI & TECH
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