CN107088585A - A kind of milling method of strip - Google Patents

A kind of milling method of strip Download PDF

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Publication number
CN107088585A
CN107088585A CN201710432903.0A CN201710432903A CN107088585A CN 107088585 A CN107088585 A CN 107088585A CN 201710432903 A CN201710432903 A CN 201710432903A CN 107088585 A CN107088585 A CN 107088585A
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CN
China
Prior art keywords
thickness
base
strip
value
milling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710432903.0A
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Chinese (zh)
Inventor
荣彦明
王建功
陈永平
崔秋艳
谭志福
王健
胡亮
张明生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shougang Jingtang United Iron and Steel Co Ltd
Original Assignee
Shougang Jingtang United Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shougang Jingtang United Iron and Steel Co Ltd filed Critical Shougang Jingtang United Iron and Steel Co Ltd
Priority to CN201710432903.0A priority Critical patent/CN107088585A/en
Publication of CN107088585A publication Critical patent/CN107088585A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16Control of thickness, width, diameter or other transverse dimensions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2261/00Product parameters
    • B21B2261/02Transverse dimensions
    • B21B2261/04Thickness, gauge

Abstract

The present invention discloses a kind of milling method of strip, and the milling method includes:The limit is born according to the rolling of the thickness of slab and roughing mills, the thickness value of the middle base is determined, the thickness for the strip that the thickness of the slab is rolled into as needed is determined;Judge the thickness value of the middle base whether in described workpiece thickness required value;If so, then carrying out roughing, flying shear and finish rolling to the slab according to the thickness value of the middle base, the strip is obtained.The limit is born by the rolling of thickness and roughing mills according to slab, determine the thickness value of the middle base, so that the thickness of the middle base is reduced as far as possible, and then the cutting head cutting tail weight of middle base is reduced, lumber recovery is improved, production cost is reduced, the thickness for improving the middle base of milling method rolling of the prior art is thicker, the weight of cutting head cutting tail is added, the lumber recovery of strip finished product is greatly reduced, the technical problem of production cost is added.

Description

A kind of milling method of strip
Technical field
The present invention relates to metallurgy industry technical field, more particularly to a kind of milling method of strip.
Background technology
In metallurgy industry, heating furnace, roughing are generally comprised in SPHC technique, flying shear, finish rolling, is batched, wherein, Mm finishing mill unit in finish-rolling process is the equipment of most critical, affects the various Con trolling index of finished product.
After heating of plate blank, slab rolling is turned into middle base by the roughing mills of roughing processing step, middle base passes through Middle base after flying shear, then, then is rolled into by the mm finishing mill unit of finish-rolling process step by the crop and back-end crop of flying shear technique The strip finished product thickness needed for user.
When using existing milling method rolling hot-rolling strip, because the thickness of middle base is thicker, adds crop and cuts The weight of tail, greatly reduces the lumber recovery of strip finished product, adds production cost, causes company's huge economic losses.
The content of the invention
The application provides a kind of milling method of strip, improves the middle base of milling method rolling of the prior art Thickness is thicker, adds the weight of cutting head cutting tail, greatly reduces the lumber recovery of strip finished product, adds the technology of production cost Problem.
The application provides a kind of milling method of strip, and the milling method includes:
The limit is born according to the rolling of the thickness of slab and roughing mills, the thickness value of the middle base, the plate is determined The thickness for the strip that the thickness of base is rolled as needed is determined;
Judge the thickness value of the middle base whether in described workpiece thickness required value;
If so, then carrying out roughing, flying shear and finish rolling to the slab according to the thickness value of the middle base, the band is obtained Steel.
Preferably, the thickness of the strip is usually 1.2mm~25.4mm.
Preferably, the workpiece thickness required value is 29mm~60mm.
Preferably, the milling method also includes:Improve the throwing steel speed in the finish-rolling process.
Preferably, the throwing steel speed is improved into 0~1m/s.
Preferably, if the thickness value of the middle base is less than described workpiece thickness required value, the milling method Also include:
Adjust the thickness value of the middle base;
Judge the thickness value of the middle base whether in described workpiece thickness required value again.
The application has the beneficial effect that:
The application bears the limit by the rolling of thickness and roughing mills according to slab, determines the thickness of the middle base Value, so that the thickness of the middle base is reduced as far as possible, and then reduces the cutting head cutting tail weight of middle base, is improved Lumber recovery, reduces production cost, and the thickness for improving the middle base of milling method rolling of the prior art is thicker, adds and cuts The weight of head back-end crop, greatly reduces the lumber recovery of strip finished product, adds the technical problem of production cost.
Further, after the thickness reduction of middle base, the rolling load reduction of the mm finishing mill unit of finish-rolling process is conducive to carrying High rolling stability.In addition, giving roughing mill by the deflection of slab is as much as possible, belt steel rolling temperature is high during roughing, bears Lotus is relatively low, reduces the power consumption of finishing mill, reduces production cost.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below In required for the accompanying drawing that uses be briefly described, it should be apparent that, drawings in the following description are only some of the present invention Embodiment.
Fig. 1-Fig. 2 is a kind of flow chart of the milling method of strip of the application better embodiment;
Fig. 3 be Fig. 1 in milling method in middle base structural representation.
Embodiment
The embodiment of the present application improves milling method rolling of the prior art by providing a kind of milling method of strip Middle base thickness it is thicker, add the weight of cutting head cutting tail, greatly reduce the lumber recovery of strip finished product, add production The technical problem of cost.
Technical scheme in the embodiment of the present application is in order to solve the above technical problems, general thought is as follows:
The application bears the limit by the rolling of thickness and roughing mills according to slab, determines the thickness of the middle base Value, so that the thickness of the middle base is reduced as far as possible, and then reduces the cutting head cutting tail weight of middle base, is improved Lumber recovery, reduces production cost, and the thickness for improving the middle base of milling method rolling of the prior art is thicker, adds and cuts The weight of head back-end crop, greatly reduces the lumber recovery of strip finished product, adds the technical problem of production cost.
Further, after the thickness reduction of middle base, the rolling load reduction of the mm finishing mill unit of finish-rolling process is conducive to carrying High rolling stability.In addition, giving roughing mill by the deflection of slab is as much as possible, belt steel rolling temperature is high during roughing, bears Lotus is relatively low, reduces the power consumption of finishing mill, reduces production cost.
In order to be better understood from above-mentioned technical proposal, below in conjunction with Figure of description and specific embodiment to upper Technical scheme is stated to be described in detail.
As depicted in figs. 1 and 2, in order to which the thickness for the middle base for improving milling method rolling of the prior art is thicker, increase Add the weight of cutting head cutting tail, greatly reduced the lumber recovery of strip finished product, add the technical problem of production cost, the application A kind of milling method of strip is provided.The milling method comprises the following steps:
Step 110;The limit is born according to the rolling of the thickness of slab and roughing mills, the thickness of the middle base is determined Value, the thickness for the strip that the thickness of the slab is made as needed is determined.The thickness of the strip be usually 1.2mm~ 25.4mm。
Step 120;Judge the thickness value of the middle base whether in described workpiece thickness required value.The centre Base thickness requirement value is 29mm~60mm.
Step 130;If so, then carrying out roughing, flying shear and finish rolling to the slab according to the thickness value of the middle base, obtain Obtain the strip.
Further, the throwing steel speed in the finish-rolling process is improved, to reach the purpose of reduction tail temperature.It is preferred that Ground, will throw steel speed and improves 0~1m/s.
In other embodiments, in addition it is also necessary to the thickness of the middle base is determined according to key points for operation, that is, operation is being met In the case of main points, workpiece thickness is reduced as far as possible.The key points for operation refer to formulate to meet the performance of strip Every technology main points.
If in addition, the thickness value of the middle base be less than described workpiece thickness required value, the milling method is also Including:
Step 140, the thickness value of the middle base is adjusted;Judge the thickness value of the middle base whether described again In workpiece thickness required value.
The application bears the limit by the rolling of thickness and roughing mills according to slab, determines the thickness of the middle base Value, so that the thickness of the middle base is reduced as far as possible, and then reduces the cutting head cutting tail weight of middle base, is improved Lumber recovery, reduces production cost, and the thickness for improving the middle base of milling method rolling of the prior art is thicker, adds and cuts The weight of head back-end crop, greatly reduces the lumber recovery of strip finished product, adds the technical problem of production cost.
Further, after the thickness reduction of middle base, the rolling load reduction of the mm finishing mill unit of finish-rolling process is conducive to carrying High rolling stability.In addition, giving roughing mill by the deflection of slab is as much as possible, belt steel rolling temperature is high during roughing, bears Lotus is relatively low, reduces the power consumption of finishing mill, reduces production cost.
Illustrated below by way of example:
Example 1:The milling method of the strip comprises the following steps:
Step S1:The strip steel specification is 2.85*1250mm, the thickness of slab is determined according to the specification of strip, according to plate The limit is born in the rolling of the thickness of base and smart roughing mills, and the thickness value for determining the SPHC centres base that weight is 25t is 32mm;
Step S2:The thickness value of the middle base is that 32mm is 29mm~60mm scopes in the workpiece thickness required value It is interior, in Two-stage control, workpiece thickness is revised as 32mm by 38mm (thickness of base in the middle of former).
Step S3:Roughing, flying shear and finish rolling are carried out to the slab according to the thickness value of the middle base, the band is obtained Steel, and the throwing steel speed in the finish-rolling process is improved, the throwing steel speed in finish-rolling process is improved into 0~1m/s, strip is reduced Afterbody temperature drop.
After the method described in embodiment 1, hot rolled thin strip is in the operation of rolling so that hot rolled strip lumber recovery improves near 0.1%.As shown in figure 3, circular is as follows:
1. and 2. region approximately regards two semicircles as, and its diameter r is the 1/4 of strip width, and region 3 can approximately regard one as Circular arc, height h is the average length 20cm of crop, according to Pythagorean theorem and trigonometric function it can be calculated that region 3. circular arc pair The central angle n answered is 70.98 °, and radius R is 107.65cm, and workpiece thickness variation delta h is 0.6cm, and slab initial weight is pressed 22 tons of calculating of the steel grade specification average weight.
The area S of region 1. and 2.1+S2=π r2=3066.41cm3
The area S of region 3.3=π R2(n/360)-b (R-20)/2=1696.36cm3
Weight loss Δ m=(S1+S2+S3) * Δs h* ρ=22.43Kg;
Lumber recovery loss=Δ m/M slab=0.102%
Example 2:The milling method of the strip comprises the following steps:
Step S1:The strip steel specification is 3.5*1800mm, the thickness of slab is determined according to the specification of strip, according to slab The rolling of thickness and roughing mills bear the limit, the thickness value for determining base in the middle of the H220YD is 31mm;
Step S2:The thickness value of the middle base is that 31mm is 29mm~60mm scopes in the workpiece thickness required value It is interior, in Two-stage control, workpiece thickness is revised as 31mm by 34mm (thickness of base in the middle of former).
Step S3:Roughing, flying shear and finish rolling are carried out to the slab according to the thickness value of the middle base, the band is obtained Steel, and the throwing steel speed in the finish-rolling process is improved, the throwing steel speed in finish-rolling process is improved into 0~1m/s, strip is reduced Afterbody temperature drop.
After the method described in example 2, according to the computational methods of example 1, slab initial weight is averagely weighed by the steel grade specification 23 tons of calculating of amount, hot rolled thin strip is in the operation of rolling, and hot rolled thin strip lumber recovery improves 0.090%.
Example 3:The milling method of the strip comprises the following steps:
Step S1:The strip steel specification is 2.0*1250mm, the thickness of slab is determined according to the specification of strip, according to slab The rolling of thickness and roughing mills bear the limit, the thickness value for determining base in the middle of 380CL that weight is 22t is 33mm;
Step S2:The thickness value of the middle base is that 33mm is 29mm~60mm scopes in the workpiece thickness required value It is interior, in Two-stage control, workpiece thickness is revised as 35mm by 35mm (thickness of base in the middle of former).
Step S3:Roughing, flying shear and finish rolling are carried out to the slab according to the thickness value of the middle base, the band is obtained Steel, and the throwing steel speed in the finish-rolling process is improved, the throwing steel speed in finish-rolling process is improved into 0~1m/s, strip is reduced Afterbody temperature drop.
After the method described in example 3, according to the computational methods of example 1, slab initial weight is averagely weighed by the steel grade specification 19 tons of calculating of amount, hot rolled thin strip is in the operation of rolling so that hot rolled thin strip lumber recovery improves 0.060%.
Technical scheme in above-mentioned the embodiment of the present application, at least has the following technical effect that or advantage:(1) heat is improved The lumber recovery of rolling thin strip.(2) stability of finish rolling region rolling is improved.(3) power consumption of finishing mill is reduced, production is reduced Cost.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to comprising including these changes and modification.

Claims (6)

1. a kind of milling method of strip, it is characterised in that the milling method includes:
The limit is born according to the rolling of the thickness of slab and roughing mills, the thickness value of the middle base is determined, the slab The thickness for the strip that thickness is rolled into as needed is determined;
Judge the thickness value of the middle base whether in described workpiece thickness required value;
If so, then carrying out roughing, flying shear and finish rolling to the slab according to the thickness value of the middle base, the strip is obtained.
2. milling method as claimed in claim 1, it is characterised in that the thickness of the strip is usually 1.2mm~25.4mm.
3. milling method as claimed in claim 1, it is characterised in that the workpiece thickness required value is 29mm~60mm.
4. milling method as claimed in claim 1, it is characterised in that the milling method also includes:Improve the finish rolling work Throwing steel speed in skill.
5. milling method as claimed in claim 1, it is characterised in that the throwing steel speed is improved into 0~1m/s.
6. milling method as claimed in claim 1, it is characterised in that if the thickness value of the middle base is less than described centre Base thickness requirement value, then, the milling method also includes:
Adjust the thickness value of the middle base;
Judge the thickness value of the middle base whether in described workpiece thickness required value again.
CN201710432903.0A 2017-06-09 2017-06-09 A kind of milling method of strip Pending CN107088585A (en)

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CN107755431A (en) * 2017-09-14 2018-03-06 首钢京唐钢铁联合有限责任公司 A kind of milling method of hot-rolling high-strength steel

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Publication number Priority date Publication date Assignee Title
CN107755431A (en) * 2017-09-14 2018-03-06 首钢京唐钢铁联合有限责任公司 A kind of milling method of hot-rolling high-strength steel

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