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Roller as well as device and method for rolling steel rails

A roll and rail technology, applied in the direction of roll, metal rolling, metal rolling, etc., can solve the problems of affecting the formability of the rail, affecting the straightening effect of the rail, etc.

Active Publication Date: 2011-05-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This affects the straightening effect of the rail due to reduced straightening reduction, affecting the formability of the rail

Method used

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  • Roller as well as device and method for rolling steel rails
  • Roller as well as device and method for rolling steel rails
  • Roller as well as device and method for rolling steel rails

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Improve the universal pass finishing mill to obtain the equipment for rolling rails of the present invention, the improvement is to use the rolls of the present invention as various types of rolling rails with a bottom width of less than 250mm manufactured by German SMS Siemag. The rail bottom vertical roll of the finishing mill of the universal rolling mill unit of the rail.

[0031]Use U75V material to roll steel rails; first, heat the rail blank to 1210°C for billet rolling, and the section shrinkage of billet rolling is 78.5%; use a universal reversible groove rolling mill to perform intermediate rolling at 1060°C, intermediate rolling The area shrinkage rate of the steel plate is 61.7%; use the above-mentioned improved universal pass finish rolling mill to carry out finish rolling at 950°C, and the area shrinkage rate of the finish rolling is 4.7%; after the rail is cooled for 3 hours, the rail temperature is lower than 60°C, and the roller Type straightening machi...

Embodiment 2

[0033] The rail is rolled according to the method of Example 1, the difference is that: the rail blank is heated to 1220°C for billet rolling, and the area shrinkage of billet rolling is 79.3%; The intermediate rolling is carried out, and the section reduction rate of the intermediate rolling is 62.5%; the finished rolling is carried out at 940°C using an improved universal pass finish rolling mill, and the section shrinkage rate of the finish rolling is 5.1%; after the rail is cooled for 2.5 hours, use a roller Type straightening machine for straightening, the straightening reduction is 37.5mm, wherein, the reduction of 2# roller, 4# roller, 6# roller and 8# roller are respectively 16mm, 14mm, 6mm, 1.5mm, with Obtain the steel rail that specification is 68kg / m. Among them, the chord height m of the arc shape A⌒A of the rail bottom vertical roll of the finishing mill is 1.69mm, and the chord height m of the arc shape C⌒C formed by the complete contact part 0 0.5mm.

Embodiment 3

[0035] The rail is rolled according to the method of Example 1, the difference is that: the rail blank is heated to 1230°C for billet rolling, and the area shrinkage of billet rolling is 80.6%; Carry out intermediate rolling, the area reduction rate of intermediate rolling is 62.4%; Use the improved universal pass finish rolling mill to carry out finish rolling at 920 ℃, the area reduction rate of finish rolling is 5.5%,; After the rail is cooled for 2.5 hours, use Roller straightening machine is straightened, and straightening reduction is 35mm, and wherein, the reduction of 2# roller, 4# roller, 6# roller and 8# roller is respectively 15mm, 13mm, 6mm, 1mm, to obtain The specification is 60kg / m rail. Among them, the chord height m of the arc shape A⌒A of the rail bottom vertical roll of the finishing mill is 1.39mm, and the chord height m of the arc shape C⌒C formed by the complete contact part 0 0.4mm.

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Abstract

The invention relates to a roller. The roller is a revolution body and at least one part of the two sides of a longitudinal section of the revolution body is a symmetrical protuberant arc. The center point of the protuberant arc coincides with center points of the two sides of the longitudinal section. The invention also provides a device for rolling steel rails. The device comprises a pair of horizontal rollers and a pair of vertical rollers. The pair of horizontal rollers are respectively used as rail webs of the two sides of the formed steel rail and the pair of vertical rollers are respectively used as a railhead and a rail base of the formed steel rail, wherein a vertical roller used for forming the rail base of the steel rail is the roller provided by the invention. The invention also provides a method for rolling the steel rails. The method comprises finish rolling of the steel rails, wherein the device for rolling the steel rails provided by the invention is used to finish roll the steel rails, so that the rail base of the steel rail has inwards-recessed parts recessed, thereby ensuring the shaping effects after straightening and effectively reducing the residual stress of the steel rails.

Description

technical field [0001] The invention relates to a roll, an apparatus for rolling a rail and a method of rolling a rail. Background technique [0002] The rail rolling process includes successively billet rolling, intermediate rolling and finish rolling on the heated rail and straightening after the rail is cooled. After straightening, the residual stress of the rail can be detected by non-destructive testing and other methods. Researches at home and abroad have shown that the size and distribution of rail residual stress will seriously affect the performance of rails. The smaller the residual stress of the rail, the more beneficial it is to the safety of the rail. Since the residual stress of the rail is formed during the rolling process of the rail, the usual method used in the prior art to control or reduce the residual stress of the rail is to reduce the bending degree of the rail before straightening and the straightening reduction. The purpose of reducing the curvatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B27/02B21B1/085
Inventor 郭华邓勇陶功明程强李叙生
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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