CN103480648A

CN103480648A - Novel PVPC (plan view pattern control) rolling process for surface plates

Info

Publication number: CN103480648A
Application number: CN201310427240.5A
Authority: CN
Inventors: 孙玮; 王杰; 陈磊; 刘朋; 宋婷婷; 陈天学; 赵婷婷
Original assignee: Jinan Iron and Steel Group Co Ltd
Current assignee: Jinan Iron and Steel Group Co Ltd
Priority date: 2013-09-18
Filing date: 2013-09-18
Publication date: 2014-01-01

Abstract

The invention discloses a novel PVPC (plan view pattern control) rolling process for surface plates. The rolling process comprises two transverse rolling passes for broadening the surface plates and eight longitudinal rolling passes for extending the surface plates. The broadened ratio of each surface plate is smaller than 1.4 after the surface plate is rolled. The rolling process particularly includes steps that the average reduction ratio of the two transverse rolling passes is higher than 10%, and 'dog bones' with ends extending obliquely and upwardly can be formed by the two transverse rolling passes; steel is turned; the maximum reduction ratio of the eight longitudinal rolling passes is 23%, and the maximum pressure is applied to the last longitudinal rolling pass. The novel PVPC rolling process has the advantages that shortcomings of slow production rhythm and unnoticeable improvement on poor plate shapes of head and tail 'tongues' of steel plates of the traditional longitudinal-transverse-longitudinal dog bone rolling process can be overcome; the dog bones are formed at the heads and the tails of the steel plates by the transverse rolling passes, and poor shapes of the heads and the tails of the steel plates are compensated in longitudinal rolling stages after the steel is turned; the shapes of 'tongues' of the heads and the tails of steel plates with the broadened ratios lower than 1.4 can be effectively improved, the rolling rhythm can be accelerated, accordingly, the production cost of steel per ton can be lowered, and an excellent effect can be realized.

Description

A kind of novel PVPC surface plate rolling mill practice

Technical field

The present invention relates to metallurgical technical field of steel rolling, especially relate to a kind of novel PVPC surface plate rolling mill practice.

Background technology

The PVPC technology is that the steel plate flat shape by rolling is ended is predicted, by reverse minimizing or compensate the corresponding plate volume of bad shape, thereby the generation that prevents bad shape is to reach the purpose of steel plate planar rectangular.The PVPC rolling is that HGC band steel is depressed in the operation of rolling, at the dog of the formation end to end bone of steel plate, and compensation steel plate head, afterbody " tongue " and cydariform transversely, obtain the template of rectangle, cut damage to reduce steel plate in finishing, improve lumber recovery, reduce production costs.

While in practical application, with vertical-horizontal-vertical PVPC technology of tradition, carrying out template control, for broadening than be greater than 1.4 steel plate width control comparatively desirable, but according to the law of minimum resistance of rolling principle, when the broadening ratio is less than 1.4, along with broadening, than less, the size of " tongue " is just larger.Vertical-horizontal-vertical PVPC of tradition is for broadening than the steel plate that is less than 1.4, and " tongue " control is very undesirable end to end for it, even, with not open the PVPC difference little, has had a strong impact on product line lumber recovery index.And due to secondary turn the rolling pass of steel band more, turn comparatively difficulty of steel, the defect yielded poorly of unit hour, increased the ton steel production cost that produces line.Therefore, how the rolling broadening than being less than 1.4 steel plate template, how to improve yield of steel plate and do not increase again a ton steel energy resource consumption and just seem particularly important.

Summary of the invention

The object of the present invention is to provide a kind of PVPC surface plate rolling mill practice with horizontal-vertical indulge-horizontal stroke-axial rolling technology processed of dogbone rolling method replacement tradition, this kind of rolling mill practice is particularly suitable for broadening than the rolling that is less than 1.4 surface plate, the technical scheme adopted is: a kind of novel PVPC surface plate rolling mill practice, it is characterized in that: described rolling mill practice consists of the transverse rolling passage that completes broadening and the axial rolling passage that completes extension, after rolling completes, the broadening ratio is less than 1.4, and the rolling mill practice step is as follows:

1) the transverse rolling passage is two passages, and the average reduction ratio of transverse rolling passage is more than 10%, and two passages are used to form " the dog bone " that end is expanded obliquely upward;

2) turn steel;

3) axial rolling passage is 8 passages, and axial rolling passage maximum depression rate is 23%, last passage pressure maximum.

Technical characterictic of the present invention also has: the transverse rolling passage target average thickness of broadening is:, wherein:

H is for turning steel thickness, i.e. broadening phase targets average thickness;

L and H are respectively the length of slab and wide;

β f and β b mean respectively the broadening ratio in extension stage and broadening stage;

The super wide amount of the edge rolling that △ bf is the extension stage.

Technical characterictic of the present invention also has: the natural broadening amount that the transverse rolling passage target width of broadening is the extension stage and the length sum in broadening stage.

Beneficial effect of the present invention is: on the basis that the objective of the invention is repeatedly to debug in the PVPC system, adopt horizontal-vertical dogbone rolling method replace tradition vertical-horizontal stroke-axial rolling system, this novel process method has overcome traditional handicraft vertical-horizontal-vertical dogbone rolling method rhythm of production is slow, steel plate end to end " tongue " bad template improve unconspicuous shortcoming.The transverse rolling passage is at steel plate head urogenesis dog bone, turns after steel in axial rolling stage compensation bad shape end to end.Can effectively improve " tongue " end to end shape of broadening ratio<1.4 steel plate, thereby improve a rolling rhythm reduction ton steel production cost simultaneously, obtain good effect.

The accompanying drawing explanation

Accompanying drawing 1 is " tongue " schematic diagram existed in vertical-horizontal-vertical technique midplane plate of tradition, and accompanying drawing 2 is process flow diagrams of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing, the present invention will be described.At first to roughing mill HGC displacement transducer DS and the OS side speed of response is inconsistent is debugged and solved the problems such as balanced hydraulic station system pressure is unstable, realize that HGC band steel is depressed to guarantee that horizontal-vertical PVPC rolling realizes smoothly.

Horizontal-vertical PVPC only need once turn steel, and the whole operation of rolling is divided into broadening and extends two stages.The target average thickness in broadening stage is to be meaned by correlation function:

(in formula, H, for turning steel thickness, is broadening phase targets average thickness; L and H are respectively the length of slab and wide; β f and β b mean respectively the broadening ratio in extension stage and broadening stage; The super wide amount of the edge rolling that △ bf is the extension stage.) the target width natural broadening amount that is the extension stage and the length sum in broadening stage.Determine passage inlet thickness, maximum reduction etc. according to initial sotck thinkness and termination target thickness.Broadening ratio<1.4 o'clock generally, going out according to MAS rolling therory system-computed that roughing mill horizontal stroke-axial rolling rules processed are divided into is ten passages, the transverse rolling stage divides and comprises that two passages are for broadening.The average percentage pass reduction of transverse rolling is more than 10%, and the power of depressing turns front more than 1.7 times of roll-force of steel first for indulge-horizontal stroke-axial rolling system of tradition.Two passages are used to form " dog bone ", according to measuring thickness device, slab thickness are monitored in real time, and the observing system feedback is calculated required " dog bone " degree of depth.Innovate the rolling strategy modification adjustment option that sets out " dog bone " degree of depth and manually offset data is adjusted on the system-computed basis in roughing mill L2 Wincc interface, make the rolling broadening obtain effectively compensating end to end than little steel plate simultaneously.After turning steel, the axial rolling extension stage is divided into eight passages, and in eight passages, the maximum depression rate is 23%, and maximum depression power appears at the 8th passage, and mean orbit speed is 2.36m/s.After finishing, ten passage rollings reach final target thickness.

PVPC horizontal stroke of the present invention-axial rolling making sheet type control technology is because minimizing turns the steel number of times, reduce rolling pass and " dog bone " degree of depth is carried out to manual compensation, effectively overcome conventional P VPC to indulge-horizontal stroke-little broadening of stringer board type control technology is slower than Plate Production rhythm, and template is controlled undesirable defect end to end.Since application, improved the template control ability of Heavy Plate Production, novel PVPC plane template control technology can improve yield of steel plate more than 0.25%, apply PVPC horizontal stroke-vertical rolling mode obviously improves, for cut deal enterprise, reduces production costs and play very key effect compared to indulge-horizontal stroke-axial rolling rhythm processed of PVPC simultaneously.

Claims

1. a novel PVPC surface plate rolling mill practice is characterized in that: described rolling mill practice consists of the transverse rolling passage that completes broadening and the axial rolling passage that completes extension, and after rolling completes, the broadening ratio is less than 1.4, and the rolling mill practice step is as follows:

2) turn steel;

2. according to novel PVPC surface plate rolling mill practice claimed in claim 1, it is characterized in that: the transverse rolling passage target average thickness of broadening is:, wherein:

L and H are respectively the length of slab and wide;

The super wide amount of the edge rolling that △ bf is the extension stage.

3. according to novel PVPC surface plate rolling mill practice claimed in claim 2, it is characterized in that: the natural broadening amount that the transverse rolling passage target width of broadening is the extension stage and the length sum in broadening stage.