CN112380634A - Method for improving effective working layer of finish rolling working roll suitable for hot-rolled old rolling mill - Google Patents
Method for improving effective working layer of finish rolling working roll suitable for hot-rolled old rolling mill Download PDFInfo
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- CN112380634A CN112380634A CN201910688526.6A CN201910688526A CN112380634A CN 112380634 A CN112380634 A CN 112380634A CN 201910688526 A CN201910688526 A CN 201910688526A CN 112380634 A CN112380634 A CN 112380634A
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- roll
- working
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- effective
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- 238000005096 rolling process Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 238000005098 hot rolling Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/02—Roll dimensions
- B21B2267/06—Roll diameter
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a method for improving an effective working layer of a finish rolling working roll, which is suitable for a hot-rolled old rolling mill and belongs to the technical field of rolling mills; the invention comprises the following steps: determining the diameter of a supporting roll for rolling steel; step two: determining the variation amplitude of the steel rolling allowable condition; step three: determining the effective working layer of the working roll and the center distance of the working roll during roll changing; step four: the proportion of the supporting rollers meeting the requirement of a larger working roller range; step five: solving the increment of the effective working layer in the step four; step five: setting the diameter increment of the working roll; step six: determining and calculating the diameter increment of the working roll; the diameter of the working roll which meets the requirements of the steel rolling condition and the roll changing condition at the same time is calculated to obtain the working roll which is most matched with the supporting roll, thereby reducing the roll consumption of the old rolling mill.
Description
Technical Field
The invention relates to a method for improving an effective working layer of a finish rolling working roll, which is suitable for a hot-rolled old rolling mill and belongs to the technical field of rolling mills.
Background
Due to the improvement of the manufacturing level of the rolling mill and the manufacturing level of the roller, the effective working layer of the roller of the new-generation rolling mill is obviously improved, if the effective working layer of the front working roller reaches 100mm during finish rolling, the effective working layer of the rear working roller reaches 90 mm.
The front section working roll of the general old rolling mill is about 80mm and the rear section working roll is about 60mm, which are obviously improved. The factors of the working layer cause a 20% increase in the consumption of the working rolls compared to the new rolling mill.
In the prior art, a device or a method for optimizing the working rolls of the old rolling mill is lacked, and a method for effectively reducing the high roll consumption of the old rolling mill is not available.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method for reducing the consumption of the rolls of the old rolling mill aiming at the high consumption of the working rolls of the old rolling mill.
The technical scheme adopted by the invention is as follows: a method for improving an effective working layer of a finish rolling working roll suitable for a hot-rolling old rolling mill is characterized by comprising the following steps:
the method comprises the following steps: determining the maximum diameter D2 and the minimum diameter D1 of the diameter D of the supporting roll for rolling steel; the maximum diameter d2 and the minimum diameter d1 of the diameter d of the working roll and a steel rolling allowance condition B;
the steel rolling permission condition B is as follows: b = D/2+ D,
the maximum range max = D2/2+ D2 of the steel rolling allowable condition B,
the minimum range min = D1/2+ D1 of the steel rolling allowable condition B;
step two: determining the variation amplitude of the steel rolling allowable condition B as L, wherein the variation amplitude is L which is the effective diameter of the working roll plus half of the effective diameter of the supporting roll,
L=（D2-D1）/2+（d2-d1）；
step three: determining an effective working layer X of the working roll, a center distance Y of the working roll during roll changing, presetting an increment of the center distance during roll changing as Y, and presetting an increment of the effective working layer as X;
when the center distance increases by the same amount as the effective working layer, i.e., x = y;
the steel rolling condition Dx needs to satisfy: dx/2+ D2+ x is not less than D2/2+ D2, Dx is not less than D2-2x, and the roller changing condition Dy needs to satisfy: dy/2+ (D2 + x)/2 is not less than D2/2+ D2/2-x, and Dy is not less than D2-3x,
when steel rolling condition Dx and roll changing condition Dy are simultaneously met, the diameter D of the supporting roll needs to meet the following requirements: d is less than or equal to D2-3 x;
step four: the proportion of the supporting rollers meeting the requirement of a larger working roller range needs to be larger than or equal to the proportion of a larger working roller, otherwise, a small supporting roller is lacked, so the increment x of the effective working layer needs to meet the following requirements:
x/（x+d2-d1）≤（D2-3x-D1）/（D2-D1）；
step five: when the increment x of the effective working layer is just satisfied, namely x/(x + D2-D1) = (D2-3 x-D1)/(D2-D1), solving the increment x of the effective working layer in the step four,
solving the following steps: x is the number of2 +（d2-d1）x-（d2-d1）（D2-D1）=0；
Step five: setting the diameter increment of the working roll as a, wherein a = kx, and k is an effective coefficient;
step six: the work roll diameter increase a is determined and calculated.
The further improvement of the scheme is that in an ideal state, k is 1; when the working roll is in a real environment, the k value is 0.3-0.9.
The invention has the beneficial effects that: the diameter of the working roll which meets the requirements of the steel rolling condition and the roll changing condition at the same time is calculated to obtain the working roll which is most matched with the supporting roll, thereby reducing the roll consumption of the old rolling mill.
Detailed Description
Through the description of the embodiments, the detailed implementation of the present invention, such as the mutual positions and connection relationships between the related parts, the functions and operating principles of the parts, the operation and using method, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the concept and technical solution of the present invention.
Examples
The 1422 production line finishing mill group of Shanghai Meishan Steel products Co., Ltd is an old mill, the rear section mill is an old mill with the model number of F4-6, the maximum diameter of a supporting roll of F4-6 is 1380, the minimum diameter of the supporting roll is 1260, the maximum diameter of a working roll is 710, and the minimum diameter of the working roll is 645.
According to the method for improving the effective working layer of the finish rolling working roll, which is suitable for the hot-rolling old rolling mill, the method comprises the following steps:
the method comprises the following steps: determining the diameter D of a supporting roll for rolled steel, the maximum diameters 1380 and 710 and the minimum diameters 1260 and 645 of the diameter D of a working roll and a rolled steel allowable condition B;
the steel rolling allowable condition B is as follows: b = D/2+ D;
it can be known that the maximum range max =1380/2+710=1400 of the allowable steel rolling condition B, and the minimum range min =1260/2+645=1275 of the allowable steel rolling condition B;
step two: determining the variation amplitude of the steel rolling allowable condition B as L, wherein the variation amplitude is L which is the effective diameter of the working roll plus half of the effective diameter of the supporting roll:
L=（D2-D1）/2+（d2-d1）=125；
step three: determining an effective working layer X of a working roller, a center distance Y of the working roller during roller changing, wherein the increment of the center distance during roller changing is preset to be Y, and the increment of the effective working layer is X; when the increase of the center distance is the same as the increase of the effective working layer, namely x = y;
the steel rolling condition Dx needs to satisfy: dx/2+ D2+ x is less than or equal to D2/2+ D2 to obtain Dx is less than or equal to D2-2x, namely Dx is less than or equal to 1380-2 x;
the roller changing condition Dy needs to meet the following requirements: dy/2+ (D2 + x)/2 is not less than D2/2+ D2/2-x, and the obtained Dy is not less than D2-3x, namely the Dy is not more than 1380-3 x;
when satisfying steel rolling condition Dx and roll change condition Dy simultaneously, backing roll diameter D needs to satisfy: d is less than or equal to 1380-3 x;
step four: the proportion of the backing roll that satisfies the requirement of great working roll scope needs more than or equal to, the proportion of great working roll, otherwise can lack little backing roll, so effective working layer's increase x needs to satisfy: x/(x + 65) is less than or equal to (120-3 x)/(120);
step five: when the increment x of the effective working layer is just met, namely the increment x of the effective working layer in the step four is solved,
solving the following steps: x is the number of2+ (D2-D1) X- (D2-D1) (D2-D1) =0, solve for X = 28.3;
step five: the diameter increment of the working roll is set as a, wherein a = kx, k is an effective coefficient, and the effective coefficient is taken as 0.707 according to the friction force of the production line;
step six: the work roll diameter increase a =0.707 × 28.3=20 was determined and calculated.
So the work roll diameter is increased by 20, the work roll pedestal split stub is increased by 20, the work roll flat head fixture on the roll change is increased by 20, and the maximum work diameter of the back end mill F4-6 of the 1422 line is increased from 65 to 85.
The present invention is not limited to the above embodiments, and any technical solutions formed by equivalent substitutions fall within the scope of the present invention.
Claims (2)
1. A method for improving an effective working layer of a finish rolling working roll suitable for a hot-rolling old rolling mill is characterized by comprising the following steps:
the method comprises the following steps: determining the maximum diameter D2 and the minimum diameter D1 of the diameter D of the supporting roll for rolling steel; the maximum diameter d2 and the minimum diameter d1 of the diameter d of the working roll and a steel rolling allowance condition B;
the steel rolling permission condition B is as follows: b = D/2+ D,
the maximum range max = D2/2+ D2 of the steel rolling allowable condition B,
the minimum range min = D1/2+ D1 of the steel rolling allowable condition B;
step two: determining the variation amplitude of the steel rolling allowable condition B as L,
the range of variation is L which is the effective diameter of the working roll plus half of the effective diameter of the supporting roll,
L=（D2-D1）/2+（d2-d1）；
step three: determining an effective working layer X of the working roll, a center distance Y of the working roll during roll changing, presetting an increment of the center distance during roll changing as Y, and presetting an increment of the effective working layer as X;
when the center distance increases by the same amount as the effective working layer, i.e., x = y;
the steel rolling condition Dx needs to satisfy: dx/2+ D2+ x is less than or equal to D2/2+ D2 to obtain Dx is less than or equal to D2-2x,
the roller changing condition Dy needs to meet the following requirements: dy/2+ (D2 + x)/2 is not less than D2/2+ D2/2-x, and Dy is not less than D2-3x,
when steel rolling condition Dx and roll changing condition Dy are simultaneously met, the diameter D of the supporting roll needs to meet the following requirements:
D≤D2-3x；
step four: the proportion of the supporting rollers meeting the requirement of a larger working roller range needs to be larger than or equal to the proportion of a larger working roller, otherwise, a small supporting roller is lacked, so the increment x of the effective working layer needs to meet the following requirements:
x/（x+d2-d1）≤（D2-3x-D1）/（D2-D1）；
step five: when the increment x of the effective working layer is just satisfied, namely x/(x + D2-D1) = (D2-3 x-D1)/(D2-D1), solving the increment x of the effective working layer in the step four,
solving the following steps: x is the number of2 +（d2-d1）x-（d2-d1）（D2-D1）=0；
Step five: setting the diameter increment of the working roll as a, wherein a = kx, and k is an effective coefficient;
step six: the work roll diameter increase a is determined and calculated.
2. The method of claim 1 for increasing the effective working layer of a finishing work roll in a hot finishing mill, wherein the method comprises the steps of: in an ideal state, k takes the value of 1; when the working roll is in a real environment, the k value is 0.3-0.9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910688526.6A CN112380634B (en) | 2019-07-29 | 2019-07-29 | Method for improving effective working layer of finish rolling working roll suitable for hot rolling old rolling mill |
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| CN201910688526.6A CN112380634B (en) | 2019-07-29 | 2019-07-29 | Method for improving effective working layer of finish rolling working roll suitable for hot rolling old rolling mill |
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| CN112380634B CN112380634B (en) | 2024-03-01 |
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| US20110113848A1 (en) * | 2009-11-16 | 2011-05-19 | Quad Engineering Inc. | Methods for reducing ridge buckles and annealing stickers in cold rolled strip and ridge-flattening skin pass mill |
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| CN103056391A (en) * | 2011-10-19 | 2013-04-24 | 上海宝钢工业检测公司 | Remanufacturing method of scrap finish rolling high speed steel working roll |
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| CN108144971A (en) * | 2016-12-05 | 2018-06-12 | 上海梅山钢铁股份有限公司 | It is suitable for roll profile optimization method of the six roller tandem mills with the prevention of quick-fried roller for target |
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