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Straightening process with external cold water for working rolls of straightening machine

A technology of external cooling water and straightening machine, which is applied in the field of steel rolling, which can solve problems such as poor plate shape, surface flesh loss, peeling, and affect the surface quality of steel plates, so as to achieve the effect of ensuring surface quality, surface brightness and cleanliness

Active Publication Date: 2013-04-10
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After the steel plate is rolled, there is often a poor shape
For example, when the extension of the edge of the strip is greater than that of the middle, it will form side waves, and when the extension of the edge is smaller than that of the middle, it will form a middle wave, and even the phenomenon of upturning or buckling of the head and tail will seriously affect the appearance of the steel plate, so the correction Straightening is an essential process in the production of medium and thick plates. Straightening can cause longitudinal and transverse deformation of the steel plate at the same time, and eliminate wave edges, wave shapes, scoops and slight cambers on the plate surface, thereby fully improving the flatness of the steel plate. Straightness and material properties; at the same time, after the steel plate is rolled, secondary oxides will be formed on the surface of the steel plate. Due to the inhomogeneity of the surface temperature of the steel plate, the thickness of the oxide is not the same. The straight roller may press the oxide on the surface of the steel plate into the surface of the steel plate, forming pits, pits or indentations. The surface of the straightened steel plate is often not clean enough, and the surface of the steel plate has unevenness. Under contact, the hardness of the surface of the roll body decreases, and the surface appears to lose flesh, peel or pile up, resulting in unevenness or roll marks on the surface of the steel plate, which directly affects the surface quality of the steel plate

Method used

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  • Straightening process with external cold water for working rolls of straightening machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A straightening process for the cold water outside the work roll of the straightening machine. When the rolled piece enters the straightening machine for straightening, the two ends of the front end of the machine, the two ends of the rear end of the machine and the outer cold water on the operating side are in the open state. The cold water at the front and rear ends of the straightening machine can wash the surface of the steel plate, and the cold water at the operating side can wash the foreign matter on the straightening roller surface, so that the surface of the straightened steel plate is bright and clean without indentation The purpose is to ensure the surface quality of the steel plate.

[0026] In this embodiment, the continuous casting billet is selected. The actual size of the billet is 150×2480×4000mm, the thickness of the finished product is 11mm, and the final rolling temperature is 650-700°C.

[0027] When the rolled piece enters the straightening machine...

Embodiment 2

[0029] A straightening process for the cold water outside the work roll of the straightening machine. In the straightening process, before the rolled piece enters the straightening machine and after the straightening is completed, the two ends of the front end, the two ends of the rear end of the machine and the outer cold water on the operating side are in the In the open state, the temperature is too high due to the long-term contact between the straightening roller and the steel plate, which will cause the local hardness of the roller surface to decrease, pile up or lose meat, and cause unevenness or roll marks on the surface of the steel plate, ensuring the surface quality of the steel plate.

[0030] In this embodiment, the continuous casting billet is selected. The actual size of the billet is 250×2220×7200mm, the thickness of the finished product is 50mm, and the final rolling temperature is 900-950°C.

[0031] Before the rolled piece enters the straightening machine, th...

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Abstract

The invention relates to a straightening process with external cold water for working rolls of a straightening machine. External cold water jets are respectively mounted on the two front ends and two rear ends of the hot straightening machine, and adopt laminar flow side jet nozzles, the jet state is radial, and front external cold water and rear external cold water are used for washing off oxide produced by the secondary oxidation of an unstraightened steel plate; or external cold water jets are mounted on the operating side of the hot straightening machine, and adopt laminar flow side jet nozzles, the jet state is radial, and the external cold water of the operating side is used for washing off foreign matters on the straightening rolls; or external cold water jets are mounted on the two front ends, two rear ends and operating side of the hot straightening machine, and adopt laminar flow side jet nozzles, and the jet state is radial. The surface of the straightened steel plate is bright and clean, and does not have impressions, meanwhile, overhigh temperature as the result of the long-time contact between the straightening rolls and the steel plate, which can cause the hardness decrease and consequent pileup of local parts of the roll surface leading to the roughness of the surface of the steel plate, is prevented, and thereby the surface quality of the steel plate is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a straightening process for cooling water outside work rolls of a straightening machine, in particular to a straightening process for cooling water outside work rolls of a nine-roll hot straightening machine. Background technique [0002] After the steel plate is rolled, there is often a poor shape. For example, when the extension of the edge of the strip is greater than that of the middle, it will form side waves, and when the extension of the edge is smaller than that of the middle, it will form a middle wave, and even the phenomenon of upturning or buckling of the head and tail will seriously affect the appearance of the steel plate, so the correction Straightening is an essential process in the production of medium and thick plates. Straightening can cause longitudinal and transverse deformation of the steel plate at the same time, and eliminate wave edges, wave shapes, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D1/02B08B3/02B21D37/16
Inventor 江业泰周中喜齐亮林乐乐杨伟光王琦
Owner SGIS SONGSHAN CO LTD
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