All-purpose four-roll finished pass rolling method for steel rail
A finished pass, universal rolling technology, applied in the field of rail rolling, can solve the problems of large changes in rail height, insufficient bending control means in the final rolling pass, difficulty in ensuring shape and surface finish, etc., to ensure surface quality, Shape and surface finish assurance, effect of reduced dimensional variation in rail height
Active Publication Date: 2018-01-19
BAOTOU IRON & STEEL GRP
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Problems solved by technology
The height and dimension of the front end and tail end of the rail vary greatly, the top surface of the rail is filled freely, the shape and surface finish are difficult to guarantee, and the bending control means of the final rolling pass are insufficient
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[0022] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0023] Please refer to Figure 1 to Figure 5 , the present invention provides a method for all-purpose four-roll finished pass rolling rail, which comprises the following steps:
[0024] The rectangular steel billet is opened after rough rolling for several passes to form a universal rolling billet section 2-5 with the following dimensions: the width of the top of the rail head is T5, the width of the rail head is D5, the height of the rail head is B5, and the rail head The side height dimension is A5;
[0025] Through the universal rough rolling pass 2-4 and the rough rolling pass 2-3 reciprocating rolling for several passes: through the universal rough rolling pass 2-4, the height of the rail head is reduced to B4, and the width ...
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The invention discloses an all-purpose four-roll finished pass rolling method for a steel rail. The all-purpose four-roll finished pass rolling method comprises the following steps that multiple passes of blooming and rough rolling are conducted on a rectangular billet, and then blooming is conducted; rolling is repeated by multiple passes through the all-purpose pass roughing and edge pass roughing; the size is controlled precisely through the edge finishing; the roll seam control size is adjusted through the universal finished pass, and the roll seam of a head roll of the all-purpose finished pass steel rail is arranged in the circular-arc position of the rail head corner; due to the fact that direct compression in the direction of the last pass height is increased, the rail height sizechange of the front end and the tail end of the rolled steel rail piece is reduced, the top face of the steel rail is limited by a tool, the shape and surface finish are guaranteed, and last pass bending control is adjusted through the height-direction rolling reduction.
Description
technical field [0001] The invention relates to the technical field of rail rolling, in particular to an all-purpose four-roller finished pass rolling method for rails. Background technique [0002] At present, the finished pass adopts the three-roll universal mode. The rectangular steel billet forms a universal rolling billet section after several passes of billet opening and rough rolling, and rolls several passes in the universal rough rolling and rough rolling pass to control the shape and size of the section. , and then the finished rail is rolled out by finishing edge rolling and universal finished pass. The rail height at the front end and tail end of the rail varies greatly, the top surface of the rail is filled freely, the shape and surface finish are difficult to guarantee, and the bending control means of the final rolling pass are insufficient. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a m...
Claims
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IPC IPC(8): B21B1/085B21B37/58
Inventor 王永明
Owner BAOTOU IRON & STEEL GRP