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Method for improving steel rail straightening blind area

A technology for straightening areas and rails, which is applied in the field of rail manufacturing, can solve the problems of no solution, production waste, etc., and achieve the effects of cutting and reducing, eliminating rail height changes, and solving the effects of high yield loss

Inactive Publication Date: 2009-11-18
PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problem of blind straightening of rails has brought about serious production waste. Although this problem has always existed, there has never been an effective solution

Method used

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  • Method for improving steel rail straightening blind area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The cold-rolling test is carried out on the 60 heavy rails made of U75V after straightening. The roll diameter of the sizing mill is 400-600mm, the motor power is 500KW, the diameter selection requirements of the upper and lower rolls are consistent, and the roll speed requirements are consistent. The roll material is High chromium alloy cast iron; the roll gap reduction of the sizing machine is hydraulic pressure reduction, and the reduction value is 2 mm. After cold rolling, the size of the straightening blind zone and the flatness of the end reach the level of the straightening zone, and then the sample is sent to the straightening zone. The detected residual stress is 186Mpa, which is less than the standard 250Mpa of high-speed railway rails, and the fracture toughness is K 1C The single minimum value is 32Mpa.m 1 / 2 , greater than the 26Mpa.m1 of the high-speed railway rail standard / 2 .

Embodiment 2

[0022] The cold rolling test is carried out on the 60 heavy rails made of U71Mn after straightening. The diameter of the sizing mill roll is 400-600 mm, the power of the motor is 500KW, the diameter selection requirements of the upper and lower rolls are the same, the roll speed requirements are the same, and the roll material is High chromium alloy cast iron; the roll gap reduction of the sizing machine is hydraulic pressure reduction, and the reduction value is 2 mm. After cold rolling, the size of the straightening blind zone and the flatness of the end reach the level of the straightening zone, and then the sample is sent to the straightening zone. The detected residual stress is 178Mpa, which is less than the standard 250Mpa of high-speed railway rails, and the fracture toughness is K 1C The single minimum value is 37Mpa.m 1 / 2 , greater than the 26Mpa.m of the high-speed railway rail standard 1 / 2 .

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Abstract

The invention discloses a method which can effectively improve a steel rail straightening blind area and avoid the production waste caused by cutting away the straightening blind area. The method is characterized in that a straightened steel rail undergoes cold rolling, thus reducing the rail height of the steel rail straightening blind area. Aiming at the rail height difference between the steel rail straightening blind area and a straightening area, the step of cold rolling after steel rail straightening is added to reduce the rail height of the steel rail straightening blind area, thereby effectively improving and even eliminating rail height change caused by the straightening blind area and meanwhile correcting full-length fluctuation of the steel rail height so as to cause the specification and size as well as the straightness degree of the steel rail straightening blind area to reach the level of the straightening area; and besides, the residual stress, fracture toughness property and other indexes of the steel rail straightening blind area are completely equal to or even better than those of the straightening area. The method conducts simple improvement on the basis of the existing process steps and effectively solves the problem of high yield rate loss which exists in the steel rail production field for a long time and is caused by the straightening blind area.

Description

technical field [0001] The invention relates to a manufacturing method of a steel rail, in particular to a method for improving the blind area of ​​the steel rail straightening during the manufacturing process of the steel rail. Background technique [0002] After the rail is rolled and formed, it needs to be straightened. Limited by the existing straightening technology, no matter how the pitch of the straightening machine is adjusted, there will always be straightening blind spots at both ends of the straightened rail. The straightening blind zone of the rail is 0.4-0.6 mm higher than the rail straightening area, the rail waist is about 0.2 mm wider, and the bottom width is about 0.1 mm wider. Affects the straightness of the ends of the rail. At present, the only way to improve the blind area of ​​rail straightening is to reduce the pitch of the straightening machine. However, reducing the pitch too much will affect the straightening effect, so using this method to impr...

Claims

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Application Information

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IPC IPC(8): B21B37/78B21D3/02
Inventor 陶功明赵云王彦中刘剑李光跃郭华程铖
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES