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Multi-line segmentation controlled rolling and controlled cooling process production line

A technology of controlled rolling and controlled cooling, production line, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of non-compliance with poor hardness, potential safety hazards, affecting production efficiency, etc., to reduce alloy content and reduce production. Cost and effect of reducing accident rate

Pending Publication Date: 2022-05-13
山西建龙实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the domestic bar rolling line generally adopts the "6+6+6" rolling mill arrangement of 18 stands. When producing 400E ribbed steel bars, effective temperature-controlled rolling cannot be carried out for multi-line cutting. Only relying on After rolling, it penetrates water strongly, and the surface layer forms a closed-loop hard shell formed by tempered martensite and bainite. The strength of the steel bar is significantly improved through phase transformation strengthening, but the welding performance and shape of the steel bar are sacrificed. It does not meet the requirements of the new national standard for hot-rolled steel bars on the structure and hardness of steel bars, and cannot achieve the purpose of removing V or effectively reducing Mn and other alloys. The traditional slit finishing pass system cannot reduce alloy costs. The uneven deformation of the cutting head leads to line difference and "blackhead" after cooling, which enters the finishing mill and produces piled steel, which seriously affects production efficiency and has potential safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0035] Embodiment 2, for the ribbed steel bar specifications of Φ12mm four-cutting and Φ16mm three-cutting, the hot billet is first rolled six passes in the rough rolling unit (Φ600×6) 1, and passed through No. 1 flying shear 11 After cutting the head (tail), it enters the middle rolling unit 2 (Φ450×6) and rolls five passes, cuts off the head (tail) by the No. 2 flying shear 12, and continues to enter the pre-finishing 6) Middle rolling for three passes, after being cut by the No. 3 flying shear machine 13, it enters the pre-finishing rolling unit No. The rolls of the pass type complete three or four split rolling, and a pre-water cooling device 4 is arranged after the pre-finishing rolling group 3, which is used to control the temperature of the rolled piece entering the finishing rolling group 5, and is cut by No. 4 flying shear machine 14 or After crushing, it is rolled for two passes in the finishing rolling unit 5 (Φ400×2), and the rolled piece can be rolled into the fin...

Embodiment 3

[0036] Embodiment 3, for the ribbed steel bar specification of 5 splits of Φ12mm, 4 splits of Φ14mm and three splits of Φ18mm, the hot billet is first rolled six passes in the rough rolling unit 1 (Φ600×6). After the No. 1 flying shear machine 11 cuts the head (tail), it enters the middle rolling unit 2 (Φ450×6) for rolling for three passes, and the No. 2 flying shear machine 12 cuts off the head (tail), and continues to enter the pre-finishing rolling Three-pass rolling in unit 1 31 (Φ350×6), after being cut by No. 3 flying shear 13, it enters pre-finishing rolling unit 2 32 (Φ350×6) for three-pass rolling, and splits the rolling section Three, four or five split rolling is completed by the rolls corresponding to the split rolling pass. After the pre-finishing rolling group 3, a pre-water cooling device 4 is arranged to control the temperature at which the rolled piece enters the finishing rolling group 5. After four After No. 14 flying shears are cut or crushed, two passes a...

Embodiment 4

[0037] Embodiment four, for the ribbed steel bar specification is two splits of Φ22mm and Φ25mm, the hot billet is first rolled six passes in the rough rolling unit 1 (Φ600×6), and cuts the head (tail) through No. 1 flying shear machine 11 ), enter the middle rolling unit 2 (Φ450×6) and roll for two passes, cut off the head (tail) by the No. Three passes, after the No. 3 flying shear machine 13 cuts the head, it enters the pre-finishing rolling unit No. 2 32 (Φ350×6) and rolls for three passes. The split rolling section passes through the rolls corresponding to the split rolling pass After the two split rolling is completed, a pre-water cooling device 4 is arranged after the pre-finishing rolling unit 3 to control the temperature at which the rolled piece enters the finishing rolling unit 5. After being cut or broken by the No. Two passes are rolled in the unit 5 (Φ400×2), and the rolled piece can be rolled into the final cross-sectional size of the finished product after pass...

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Abstract

The invention relates to a multi-line segmentation controlled rolling and controlled cooling process production line which comprises a roughing mill unit, an intermediate mill unit, a pre-finishing mill unit, a pre-water cooling device, a finishing mill unit and a post-rolling water cooling device which are sequentially arranged in the running direction of a rolled piece, and a first flying shear is arranged between the roughing mill unit and the intermediate mill unit; a second flying shear is arranged between the intermediate rolling unit and the pre-finishing mill unit, the pre-finishing mill unit comprises a first pre-finishing mill unit and a second pre-finishing mill unit, a third flying shear is arranged between the first pre-finishing mill unit and the second pre-finishing mill unit, a fourth flying shear is arranged at an inlet of the pre-finishing mill unit, and a multiple-length segmented flying shear is arranged behind the after-rolling water cooling device. A cooling bed, a cold shearing machine and a collecting device are sequentially arranged behind the multiple-length segmented flying shear; the method has the advantages that the alloy content is reduced, energy is saved, the production cost is reduced, meanwhile, the quality of the multi-wire cutting bar is improved, and the efficiency of a multi-wire cutting bar production line is greatly improved.

Description

technical field [0001] The invention relates to the technical field of steel rolling technology, in particular to a multi-line cutting, controlled rolling and controlled cooling process production line. Background technique [0002] At present, the domestic bar rolling line generally adopts the "6+6+6" rolling mill arrangement of 18 stands. When producing 400E ribbed steel bars, effective temperature-controlled rolling cannot be carried out for multi-line cutting. Only relying on After rolling, the water is penetrated strongly, and a closed-loop hard shell formed by tempered martensite and bainite is formed on the surface layer. The strength of the steel bar is significantly improved through phase transformation strengthening, but the welding performance and shape of the steel bar are sacrificed. It does not meet the requirements of the new national standard for hot-rolled steel bars on the structure and hardness of steel bars, and cannot achieve the purpose of removing V or...

Claims

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Application Information

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IPC IPC(8): B21B1/16B21B15/00B21B45/02
CPCB21B1/16B21B15/0007B21B45/0224
Inventor 刘嘎徐晓林
Owner 山西建龙实业有限公司