CN101811141A

CN101811141A - Novel method for controlling plate shape of heavy and medium plate mill

Info

Publication number: CN101811141A
Application number: CN 201010151038
Authority: CN
Inventors: 唐运章
Original assignee: Nanjing Iron and Steel Co Ltd
Current assignee: Nanjing Iron and Steel Co Ltd
Priority date: 2010-04-15
Filing date: 2010-04-15
Publication date: 2010-08-25

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

A kind of novel board-shape control method of heavy and medium plate mill

Technical field

The invention belongs to field of metallurgy, specifically a kind of novel board-shape control method of heavy and medium plate mill.

Background technology

At present, the milling method that world's heavy and medium plate mill all adopts the last pass band to depress does not have planishing pass, and the final pass reduction ratio is at 5-15%.Fig. 1 is the existing rolling sketch of heavy and medium plate mill, wherein, the 1st, cut deal four-high mill, the 2nd, rollgang, the 3rd, steel plate.Because rolling pass is more, the single pass reduction ratio is less, and the performance of product does not reach requirement, simultaneously because final pass has the reduction ratio of 5-15%, when rolling high-strength degree level (as: below the X70 rank) and thin slab product, steel plate head, surface configuration are relatively poor, and to Fig. 2-e, wherein a is the head nose as Fig. 2-a, b is that head is kowtowed, c is the head ligulate, and d is a wave in the surface, and e is the Surface Edge wave.In this case, the steel plate glacing flatness does not reach product requirement, and it is strong to need straightener to return, and returns to rectify undesirablely can only change waste product into, brings enormous economic loss to enterprise.

Summary of the invention

Low in order to overcome the single pass reduction ratio that exists in the prior art, unstable properties, the steel plate head nose, kowtow, the plate shape problem of ligulate, steel plate limit wave, middle wave, the novel board-shape control method that the purpose of this invention is to provide a kind of heavy and medium plate mill, last passage is the rolling of formation plate shape in this novel board-shape control method, this method skill realizes simple, automaticity is higher, manual intervention is few, dimensional accuracy is high, and stable performance, plate shape are good, have improved frequent benefit.

The objective of the invention is to be achieved through the following technical solutions:

A kind of novel board-shape control method of heavy and medium plate mill, it is characterized in that: rolling last passage is for reducing the steel plate nose, kowtowing and the planishing pass of shape wave in this method, this planishing pass speed is controlled at 1.0-3.0m/s, and roll gap is than the big 1-5mm of finished product thickness, and roll-force is at the 200-600 ton.

Among the present invention, according to rolling procedure, distribute the reduction ratio of preceding each rolling pass of planishing pass, increase percentage pass reduction, crystal grain thinning in the operation of rolling improves mechanical performance.

The present invention can adjust the roll gap of planishing pass according to the plate shape that goes out milling train and the size of roll-force.By the speed control of planishing pass, satisfy the required finishing temperature of technology.

The present invention reduces a time as planishing pass on the basis of traditional milling method, improve the rolling pass reduction ratio, and planishing pass speed is controlled at 1.0-3.0m/s, and roll gap adds 1-5mm basically at finished product thickness, and roll-force is at the 200-600 ton.

Compared with prior art, the present invention under the situation of the dimensional tolerance that guarantees product, improves the product mechanicalness by the control to rolling pass, percentage pass reduction, mill speed, reduces the alloying element consumption, saves production cost, and improves plate shape.Automated procedures height of the present invention, manual intervention is few, the dimensional accuracy height, stable performance has improved frequent benefit.

Description of drawings

Fig. 1 is the existing rolling sketch of heavy and medium plate mill;

Fig. 2-a is traditional milling method steel plate head to Fig. 2-e, surface configuration;

Fig. 3-A and Fig. 3-B are milling method steel plate head of the present invention, surface configuration;

The specific embodiment

Embodiment 1

A kind of novel board-shape control method of heavy and medium plate mill of the present invention, promptly on the basis of traditional milling method, reduce a time as planishing pass, with last rolling passage as reducing the steel plate nose, kowtowing and the planishing pass of shape wave, by changing rolling procedure, improve the rolling pass reduction ratio, planishing pass speed is controlled at 2.0m/s, roll gap adds 4mm on finished steel plate thickness basis, roll-force is at 400 tons.Relevant parameter can be adjusted on operation interface according to plate shape and last passage roll-force.

Mill speed of the present invention, start rolling temperature, finishing temperature, percentage pass reduction distribute and can adjust by second computer, and be identical with traditional rolling mill practice.

Good by the finished product steel-plate shape that the present invention obtains, Fig. 3-A and Fig. 3-B are milling method steel plate head of the present invention, surface configuration, and wherein A is that nose shape is straight, and B is that plate shape surface is straight, and the product recovery rate is higher.

Embodiment 2

The novel board-shape control method of another heavy and medium plate mill, promptly on the basis of traditional milling method, reduce a time as planishing pass, with last rolling passage as reducing the steel plate nose, kowtowing and the planishing pass of shape wave, improve the rolling pass reduction ratio, planishing pass speed is controlled at 1.0m/s, and roll gap adds 2mm on finished steel plate thickness basis, and roll-force is at 500 tons.

By changing rolling procedure, with last percentage pass reduction of traditional milling method in advance, change planishing pass into, mill speed of the present invention, start rolling temperature, finishing temperature, percentage pass reduction distribute and can adjust by second computer, and be identical with traditional rolling mill practice.

Embodiment 3

The novel board-shape control method of another heavy and medium plate mill, promptly on the basis of traditional milling method, reduce a time as planishing pass, with last rolling passage as reducing the steel plate nose, kowtowing and the planishing pass of shape wave, improve the rolling pass reduction ratio, planishing pass speed is controlled at 3.0m/s, and roll gap adds 5mm on finished steel plate thickness basis, and roll-force is at 600 tons.

Claims

1. the novel board-shape control method of a heavy and medium plate mill, it is characterized in that: rolling last passage is for reducing the steel plate nose, kowtowing and the planishing pass of shape wave in this method, this planishing pass speed is controlled at 1.0-3.0m/s, roll gap is than the big 1-5mm of finished product thickness, and roll-force is at the 200-600 ton.

2. the novel board-shape control method of a kind of heavy and medium plate mill according to claim 1, it is characterized in that: according to rolling procedure, distribute the reduction ratio of preceding each rolling pass of planishing pass, increase percentage pass reduction, crystal grain thinning in the operation of rolling improves mechanical performance.

3. the novel board-shape control method of a kind of heavy and medium plate mill according to claim 1 is characterized in that: according to the plate shape that goes out milling train and the size of roll-force, adjust the roll gap of planishing pass.

4. the novel board-shape control method of a kind of heavy and medium plate mill according to claim 1 is characterized in that: by the speed control of planishing pass, satisfy the required finishing temperature of technology.