Method for controlling even deformation of edge portion in medium-thick board rolling

A technology of uniform deformation and control method, applied in the direction of metal rolling stand, metal rolling mill stand, etc., can solve problems such as unsatisfactory effect

Inactive Publication Date: 2012-07-04
QINHUANGDAO SHOUQIN METAL MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional control method is to optimize the edge shape by improving the quality of steel fired in the heating furnace or the distribution of rolling passes, but the effect is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、17

[0008] Embodiment 1, 17.5mm hydropower steel (Q460C)

[0009] Billet size: 250*2000*3750mm

[0010] Steel plate size: 25*2630*28000mm

[0011] There are 3 passes in the widening stage. SKI coefficient setting of the first 2 passes and the speed ratio of the upper and lower rolls:

[0012] Widening pass

Embodiment 2、17

[0013] Embodiment 2, 17.5mm pipeline steel (X70)

[0014] Billet size: 250*2000*3000mm

[0015] Steel plate size: 17.5*3177*26500mm

[0016] There are 4 passes in the widening stage. SKI coefficient setting of the first 2 passes and the speed ratio of the upper and lower rolls:

[0017] Widening pass

[0018] Through this SKI coefficient control method, the uniformity of deformation at the edge of the steel plate is greatly improved. The average shear amount is reduced by 20mm, and the grinding rate of defects such as edge longitudinal cracks is greatly reduced.

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Abstract

A method for controlling even deformation of an edge portion in medium-thick board rolling belongs to the technical field of medium-thick board rolling. The technical parameters are that the effective using range of roller diameter of a working roller of a roughing mill is 1020-1120mm, and the roller distribution rule is that diameter of an upper working roller is (0-6)mm larger than that of a lower working roller; and parameters in a widening stage of the roughing mill are that largest rolling force is 8500KN, largest torque is 3200KNm, largest pressing down quantity is 40mm, steel biting speed is (1-2)m/s, and rolling speed is (2.5-4.5)m/s. At conditions of the device and set parameters, widening generally requires 3-6 times according to size of the widening ratio; SKI parameter is set to be +8 in first widening, and the rolling speed is linear speed; and range of a second time is set to be +5-+8. The method has the advantages of reducing uneven upper wide and lower narrow deformation of the edge portion of a steel plate, achieving good control on the shape of the edge portion of the steel plate, accordingly being capable of controlling cutting deformation of the steel plate and improving yield of the steel plate.

Description

technical field [0001] The invention belongs to the technical field of medium and thick plate rolling, and in particular provides a method for controlling the uniform deformation of the rolling edge of the medium and heavy plate. Background technique [0002] At present, due to many influencing factors in the rolling process of medium and heavy plates, it is difficult to control the uniformity of deformation at the edge of the steel plate. After the edge of the steel plate is rolled into a wedge shape, it is easy to cause insufficient trimming and narrow rolling. If the amount of billet feeding is increased, the steel plate yield will be reduced, which will virtually increase the production cost of medium and thick plates. The traditional control method is to optimize the edge shape by improving the quality of steel fired in the heating furnace or the distribution of rolling passes, but the effect is not ideal. Contents of the invention [0003] The object of the present ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/22
Inventor 郭伟田士平董占斌张跃飞何元春沈开照
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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