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Novel method for controlling plate shape of heavy and medium plate mill

A technology for shape control and rolling mill, applied in the field of metallurgy, can solve the problems of economic loss of enterprises and the flatness of steel plates can not meet the product requirements, and achieve the effects of less manual intervention, improving regular benefits and saving production costs.

Inactive Publication Date: 2010-08-25
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the flatness of the steel plate does not meet the product requirements, and a straightening machine is required for back-leveling. If the back-leveling does not meet the requirements, it can only be replaced as a waste product, which brings huge economic losses to the enterprise.

Method used

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  • Novel method for controlling plate shape of heavy and medium plate mill
  • Novel method for controlling plate shape of heavy and medium plate mill
  • Novel method for controlling plate shape of heavy and medium plate mill

Examples

Experimental program
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Effect test

Embodiment 1

[0014] A novel shape control method for a medium and heavy plate rolling mill according to the present invention, that is, on the basis of the traditional rolling method, one pass is reduced as a smoothing pass, and the last pass of rolling is used as a method for reducing warping and knocking of the steel plate. For the wave-shaped smoothing pass, by changing the rolling procedure, the reduction rate of the rolling pass is increased, the speed of the smoothing pass is controlled at 2.0m / s, the roll gap is increased by 4mm on the basis of the thickness of the finished steel plate, and the rolling force is 400 Ton. Relevant parameters can be adjusted on the operation interface according to the shape of the strip and the rolling force of the last pass.

[0015] The rolling speed, starting rolling temperature, final rolling temperature, and pass reduction distribution of the present invention can be adjusted through a secondary computer, which is the same as the traditional rolli...

Embodiment 2

[0018] Yet another new shape control method for medium and heavy plate mills, that is, on the basis of the traditional rolling method, one pass is reduced as a smoothing pass, and the last pass of rolling is used as a method for reducing warping, knocking and wave shape of the steel plate Smooth pass, increase the reduction rate of rolling pass, control the pass speed at 1.0m / s, add 2mm to the thickness of the finished steel plate for the roll gap, and the rolling force at 500 tons.

[0019] By changing the rolling schedule, the reduction rate of the last pass of the traditional rolling method is changed to a smooth pass. The rolling speed, starting rolling temperature, final rolling temperature, and pass reduction rate distribution of the present invention can be passed through two stages. The computer makes adjustments, the same as the traditional rolling process.

Embodiment 3

[0021] Yet another new shape control method for medium and heavy plate mills, that is, on the basis of the traditional rolling method, one pass is reduced as a smoothing pass, and the last pass of rolling is used as a method for reducing warping, knocking and wave shape of the steel plate Smooth pass, increase the reduction rate of rolling pass, control the pass speed at 3.0m / s, add 5mm to the thickness of the finished steel plate for the roll gap, and the rolling force at 600 tons.

[0022] By changing the rolling schedule, the reduction rate of the last pass of the traditional rolling method is changed to a smooth pass. The rolling speed, starting rolling temperature, final rolling temperature, and pass reduction rate distribution of the present invention can be passed through two stages. The computer makes adjustments, the same as the traditional rolling process.

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Abstract

The invention discloses a novel method for controlling the plate shape of a heavy and medium plate mill. The last milling pass in the method is a planishing pass for reducing head warping, head knocking and wave shape of a steel plate; the speed of the planishing pass is controlled to be between 1.0 and 3.0 m / s; the roll gap is 1 to 5 mm larger than the thickness of a finished product; and the milling force is between 200 and 600 tons. The roll gap of the planishing pass can be adjusted according to the conditions of the plate shape and the milling force. The product produced by the method can avoid the defects of head warping, head knocking, tongue shape, wave shape and the like of the steel plate; the thickness of the steel plate meets the requirements of tolerance; and the method further improves mechanical properties of the steel plate, reduces alloy elements, saves production cost and improves economic benefit of enterprises.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a novel shape control method for a medium and thick plate rolling mill. Background technique [0002] At present, the world's medium and heavy plate rolling mills all adopt the rolling method of rolling with reduction in the final rolling pass. There is no smoothing pass, and the reduction rate of the final pass is 5-15%. Fig. 1 is a schematic rolling diagram of an existing medium and heavy plate rolling mill, wherein, 1 is a medium and heavy plate four-high rolling mill, 2 is a conveying roller table, and 3 is a steel plate. Due to the large number of rolling passes, the reduction ratio of a single pass is small, and the performance of the product cannot meet the requirements. Grade below) and thin-gauge products, the head and surface shape of the steel plate are poor, as shown in Figure 2-a to Figure 2-e, where a is the head tilting, b is the head knocking, c is the tongue shape of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/28
Inventor 唐运章
Owner NANJING IRON & STEEL CO LTD
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