CN114669628A - Method for eliminating longitudinal indentation on new roll system of hot straightening machine - Google Patents
Method for eliminating longitudinal indentation on new roll system of hot straightening machine Download PDFInfo
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- CN114669628A CN114669628A CN202210527376.2A CN202210527376A CN114669628A CN 114669628 A CN114669628 A CN 114669628A CN 202210527376 A CN202210527376 A CN 202210527376A CN 114669628 A CN114669628 A CN 114669628A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000007373 indentation Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 229910000746 Structural steel Inorganic materials 0.000 claims description 12
- 238000005498 polishing Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 6
- 238000013000 roll bending Methods 0.000 claims description 6
- 238000013439 planning Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
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- 238000007726 management method Methods 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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Abstract
The invention discloses a method for eliminating longitudinal indentation on a new roll system of a hot straightener, which specifically comprises the following steps: grinding and changing the end face chamfer of the hot-straightening roller system supporting roller; step two: the rolling steel plate plan is specially arranged within at least 2 days after the new roller system is arranged on the machine, and a special straightening strategy is carried out based on the arrangement of the rolling steel plate plan, so that the hot straightening new roller system can quickly and efficiently obtain a stable running-in state, the surface quality of the steel plate is good, the 'hair' of the working roller surface of the hot straightening machine new roller system is eliminated, the manual grinding process is reduced, and the production efficiency of the thick plate is improved. By using the technical method, the longitudinal indentation generated on the new roll system of the thick plate hot straightener is solved, the hair of the hot straightener roll system can be effectively controlled, the longitudinal indentation caused on the upper surface of the steel plate is eliminated, the stable running state of equipment on the new roll system is ensured, and the requirement of a user on the surface quality of the steel plate can be met.
Description
Technical Field
The invention relates to a straightening control technology of a thick plate straightener, in particular to a longitudinal indentation control technology of a new roller system of the thick plate straightener.
Background
At present, the quality indexes of the medium plate product mainly comprise four aspects of size and shape precision, surface quality, mechanical property, plate shape and the like, and the surface quality and the plate shape are important components of the main quality indexes of the medium plate product. In order to ensure that the steel plate obtains good shape, the steel plate is often straightened by a hot straightening machine after rolling. For example, in a thick plate hot straightener of simacre, under normal conditions, the roll changing period of the hot straightener is 3 months, and after a new roll system is arranged on the straightener each time, the problem of running-in of the new roll system needs to be solved.
After a new roll of the hot straightener is arranged on the machine, the phenomenon of longitudinal indentation of the straightened steel plate often occurs in the production and operation of thick plates, a plurality of longitudinal indentations are easy to appear on the upper surface of the steel plate and are distributed in a thin line shape, and the contact end surface of a working roll and a supporting roll of the hot straightener is easy to scratch or hair. In production, the hot straightening roller system newly arranged on the machine is subjected to shutdown grinding for 2-3 times every day when the surface of a working roller of the hot straightening roller system is hairy in the first two weeks or even lasting to three weeks after the hot straightening roller system is arranged on the machine, wherein the time for grinding is 15-30 minutes each time, and even 2 hours in serious cases.
The length of the working roll surface of the upper roll system of the hot straightening machine is 4500mm, the length of the support roll surface is 435mm, the length of the support roll bearing seat is 278mm, the end part of each support roll is in line-to-surface contact with the working roll surface, stress concentration is easy to generate, the damage of the working roll surface is caused, and the position of the damage is symmetrical about the central line of the working roll, as shown in figure 1.
The position of the working roll indentation corresponds to the edge positions of a plurality of supporting rolls in the middle, taking the transmission side as an example, the positions close to 217.5mm, 495.5mm, 930.5mm and 1208.5mm away from the center deviation transmission test are more consistent with the hot straightening indentation of a thick plate, and the closer to the center of the working roll, the more easily the indentation is generated, and the more obvious the indentation is. Therefore, the longitudinal indentation of the hot straightener is matched with the surface damage of the working roll caused by the linear-surface contact of the supporting roll and the working roll.
The problem of running-in of the rear roller system on the hot straightening roller system always troubles the production of thick plates. This phenomenon has the following four adverse effects:
(1) the risk of surface quality of the batch of steel plates exists;
(2) the manual grinding amount of the subsequent process is greatly increased;
(3) the rolling is interrupted, the abnormal shutdown time is increased, and the rolling rhythm and hot charging and hot delivery are disturbed;
(4) the extra workload of the staff on duty is increased, which causes the increase of labor amplitude.
The existing common control method for longitudinal indentation on a hot straightening roller system is to artificially grind the hot straightening roller system and grind the upper surface of an indentation steel plate, so that the production can be maintained on site. The method in the prior art has a simple principle, and mainly solves the problem that after a new roll system of a hot straightening machine is operated, the roll surface of the hair of a working roll of the hot straightening machine and the indentation generated on the upper surface of a steel plate are manually grinded, and the management and control are carried out by sacrificing manpower and productivity and facing the batch quality risk cost. However, from the actual production and operation on site, the management and control method belongs to 'after-the-fact type' and 'passive type' management and control, and the manual grinding mode not only influences the surface quality of the steel plate, but also causes long-term damage to the service life of the roll system, increases the abrasion of the roll system, and increases the maintenance cost of the on-site production equipment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for eliminating longitudinal indentation on a new roll system of a hot straightening machine for thick plates. The method mainly solves the defects of the contact stress distribution of the hot-straightening roller system and the hair in the running-in process of the hot-straightening roller system in the existing control method after the longitudinal indentation is generated, adopts the thought of 'prior control', and realizes the elimination of the longitudinal indentation of the newly-installed hot-straightening roller system through planning selection and straightening strategy change, thereby obtaining good steel plate surface quality, reducing abnormal machine halt such as manual grinding and the like, and better meeting the use requirements of users.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for eliminating longitudinal press marks on a new roll system of a hot straightening machine comprises the following steps:
the method comprises the following steps: grinding and changing the end face chamfer of the hot-straightening roller system supporting roller; by changing the chamfer angle of the end face of the supporting roll, small acute angles generated after the chamfer angle of the online equipment can be eliminated, the stress concentration between the end face of the supporting roll and the roll surface of the working roll is reduced, and the arc contact is realized.
Step two: within at least 2 days after the new roll system is on the machine, the rolled steel plates are planned as follows:
(1) arranging ordinary structural steel in the front 20 blocks, wherein the width specification is 2200-2800 mm;
(2) 21-30 pieces of common structural steel with the width specification of 2500-3000 mm are arranged;
(3) 31-40 pieces of common structural steel with the width specification of 3000-3600 mm are arranged;
(4) after 40 steel varieties except the non-water-spraying plate with the finishing rolling temperature being more than or equal to 780 ℃, thin plates with the thickness being less than 8mm, TMCP plates and extra-thick plates are not eliminated; steel grades with high surface requirements are not arranged;
the straightening strategy based on the planning arrangement of the rolled steel plate is as follows:
(1) the first 20 blocks are completely emptied without straightening by thermal straightening, each block of steel is emptied for 3 times back and forth, and the surface of the thermal straightening roller is baked; promoting the surface of the hot straightening roller to blued, and forming a compact oxide film on the surface of the hot straightening roller system, thereby establishing a stable running-in stage.
(2) 21-50 straightening forces are manually intervened, the straightening forces are less than or equal to 80 tons, and transverse tilting and roll bending are forbidden;
(3) after 51 rollers go backwards until the new roller system is arranged on the machine within 1 day, adopting manual intervention straightening force, wherein the straightening force is less than or equal to 150 tons, and forbidding transverse tilting and roller bending;
(4) on the 2 nd day and the following days after the new roller system is arranged on the machine, light straightening or normal straightening is selected according to the straightening effect of the previous 1 day, and transverse tilting and roller bending can be selected.
Further, the first step specifically comprises: and according to the measured chamfer angle data of the end face of the supporting roller after the old roller system is abraded, polishing the chamfer angle of the end face of the supporting roller corresponding to the new roller system into the same or close chamfer angle.
Further, the first step specifically comprises: and chamfering and polishing the end face of the supporting roller of the hot straightening roller system to change R to 3 mm.
And further, only four end face chamfers close to the central line position of the roller system are ground.
And further, carrying out chamfering and polishing on the end face before assembling on the new roller system of the hot straightening machine.
The method is suitable for the hot straightening machine with the working roll surface length of 4500 mm.
The invention has the beneficial effects that: the method adopts the methods of changing the end face chamfer of the supporting roller, selecting the rolling schedule and changing the straightening strategy, so that the hot straightening new roller system can quickly and efficiently obtain a stable running-in state, the surface quality of the steel plate is good, the 'hair' of the working roller surface of the hot straightening machine new roller system is eliminated, the manual coping process is reduced, and the production efficiency of the thick plate is improved. By using the technical method, the longitudinal indentation generated on the new roll system of the thick plate hot straightener is solved, the hair of the hot straightener roll system can be effectively controlled, the longitudinal indentation caused on the upper surface of the steel plate is eliminated, the stable running state of equipment on the new roll system is ensured, and the requirement of a user on the surface quality of the steel plate can be met.
Drawings
FIG. 1 is a schematic view of a roll system of a hot straightener;
number designation in the figures: 1-center line, 2-end face chamfer angle of the supporting roller.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The quadruple straightening machine comprises the following main equipment parameters: 5 upper working rolls and 6 lower working rolls, wherein the roll diameter of the working rolls is 285mm, and the length of the working rolls is 4500 mm. The upper supporting rollers and the lower supporting rollers are both 30, and the diameter of each supporting roller is 300 mm. The maximum straightening force is 34000 KN. The width of the steel plate can be straightened within the range of 1200-4250 mm, the thickness of the steel plate can be straightened within the range of 5-120 mm, the straightening temperature can be 300-1050 ℃, and the straightening speed can be 0-2.5 m/s.
(1) Improvement of equipment structure
Backing roll terminal surface chamfer 2 becomes R by original R2.5 mm and is 3mm, finishes to carry out chamfer 2 manual work before the equipment and polishes, eliminates the little acute angle that produces behind the online equipment chamfer 2, realizes being the circular arc contact.
(2) Planning and arranging of rolled steel plates:
the first 20 blocks are arranged with common structural steel Q345B, width specification 2450 and 2650 mm;
(II) 21-30 blocks of ordinary structural steel Q345B with the width specification of 2550-2950 mm;
(III) 31-40 pieces of common structural steel Q345B are arranged, and the width specification is 3100-3400 mm;
and fourthly, arranging the rolling plan according to the specification normally after 40 blocks.
(3) Straightening strategy of thermal straightening machine
Firstly, the front 20 steel blocks are not straightened and are completely emptied, each steel block is emptied back and forth for 3 times, the hot straightening roller surface is baked, the roller gap height is 300mm, the straightening speed is 0.8m/s, the hot straightening roller surface is promoted to turn blue, and the thickness range is 40-60 mm;
secondly, 21-50 straightening forces are manually intervened, wherein the straightening forces are 40-80 tons, and transverse tilting and roll bending are forbidden;
thirdly, after 51 blocks go backward, adopting manual intervention straightening force until 1 day, wherein the straightening force is 100-150 tons, and forbidding transverse tilting and roll bending;
after day 2, straightening was performed normally, using a small amount of lateral tilting and bending rolls. The hot straightening roller system has normal surface and good steel plate surface quality, and manual shutdown polishing is not carried out.
Example two
The quadruple straightening machine comprises the following main equipment parameters: 5 upper working rolls and 6 lower working rolls, wherein the roll diameter of the working rolls is 285mm, and the length of the working rolls is 4500 mm. The number of the upper supporting rollers and the number of the lower supporting rollers are both 30, and the diameter of each supporting roller is 300 mm. The maximum straightening force is 34000 KN. The width of the steel plate can be straightened within the range of 1200-4250 mm, the thickness of the steel plate can be straightened within the range of 5-120 mm, the straightening temperature can be 300-1050 ℃, and the straightening speed can be 0-2.5 m/s.
(1) Improvement of equipment structure
Backing roll terminal surface chamfer 2 becomes R by original R2.5 mm and 3mm, finishes to carry out chamfer 2 manual work before the equipment and polishes, eliminates the little acute angle that produces behind the online equipment chamfer 2, realizes being the circular arc contact.
(2) Planning and arranging rolled steel plates:
the first 20 blocks are made of common structural steel BSM48C with the width specification of 2200 and 2450 mm;
(II) 21-30 blocks of ordinary structural steel Q235B with the width specification of 2525-2850 mm;
(III) arranging 30-40 pieces of common structural steel Q235B with the width specification of 3150-3500 mm;
and fourthly, arranging the rolling plan according to the specification normally after 40 blocks.
(3) Straightening strategy of thermal straightening machine
Firstly, the front 20 steel blocks are not straightened and are completely emptied, each steel block is emptied back and forth for 3 times, the hot straightening roller surface is baked, the roller gap height is 300mm, the straightening speed is 0.8m/s, the hot straightening roller surface is promoted to turn blue, and the thickness range is 25-50 mm;
secondly, 21-50 straightening forces are manually intervened, wherein the straightening forces are 30-70 tons, and transverse tilting and roll bending are forbidden;
thirdly, after 51 blocks go backward, adopting manual intervention straightening force until 1 day, wherein the straightening force is 80-130 tons, and forbidding transverse tilting and roll bending;
after day 1.5, straightening was performed normally, using a small amount of lateral tilting and bending rolls. The surface of the hot straightening roller system is normal, the surface quality of the steel plate is good, and manual shutdown grinding is not carried out.
The above description is only for the purpose of illustrating the technical solutions of the present invention, and those skilled in the art can make simple modifications or equivalent substitutions on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A method for eliminating longitudinal indentation on a new roll system of a hot straightening machine is characterized by comprising the following steps: the method specifically comprises the following steps:
the method comprises the following steps: grinding and changing the end face chamfer of the hot-straightening roller system supporting roller;
step two: within at least 2 days after the new roll system is operated, the rolled steel plates are planned as follows:
(1) arranging ordinary structural steel in the front 20 blocks, wherein the width specification is 2200-2800 mm;
(2) 21-30 pieces of ordinary structural steel with the width specification of 2500-3000 mm are arranged;
(3) 31-40 pieces of common structural steel with the width specification of 3000-3600 mm are arranged;
(4) after 40 steel varieties except the non-water-spraying plate with the finishing rolling temperature of more than or equal to 780 ℃, thin plates with the thickness of less than 8mm, TMCP plates and extra-thick plates are not excluded; steel grades with high surface requirements are not arranged;
the straightening strategy based on the planning arrangement of the rolled steel plate is as follows:
(1) the first 20 blocks are completely emptied without straightening by thermal straightening, each block of steel is emptied for 3 times back and forth, and the surface of the thermal straightening roller is baked;
(2) 21-50 straightening forces are manually intervened, the straightening forces are less than or equal to 80 tons, and transverse tilting and roll bending are forbidden;
(3) after 51 rollers go backwards until the new roller system is arranged on the machine within 1 day, adopting manual intervention straightening force, wherein the straightening force is less than or equal to 150 tons, and forbidding transverse tilting and roller bending;
(4) on the 2 nd day and the following days after the new roller system is arranged on the machine, light straightening or normal straightening is selected according to the straightening effect of the previous 1 day, and transverse tilting and roller bending can be selected.
2. The method for eliminating longitudinal indentation on a new roll system of a thermal straightener as claimed in claim 1, characterized in that: the first step is specifically as follows: and according to the measured chamfer angle data of the end face of the supporting roller after the old roller system is abraded, polishing the chamfer angle of the end face of the supporting roller corresponding to the new roller system into the same or close chamfer angle.
3. The method for eliminating longitudinal indentation on a new roll system of a thermal straightener as claimed in claim 1, wherein: the first step is specifically as follows: and chamfering and polishing the end face of the supporting roller of the hot straightening roller system to change R to 3 mm.
4. The method for eliminating longitudinal indentation on a new roll system of a thermal straightener as claimed in claim 3, characterized in that: only four end face chamfers close to the central line of the roller system are ground.
5. The method for eliminating longitudinal indentation on a new roll system of a hot straightener as claimed in claim 2, 3 or 4, characterized in that: and performing chamfering and polishing on the end face before assembling the new roller system of the hot straightening machine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210527376.2A CN114669628B (en) | 2022-05-16 | 2022-05-16 | Method for eliminating longitudinal indentation of new roller tying machine of thermal straightening machine |
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| CN202210527376.2A CN114669628B (en) | 2022-05-16 | 2022-05-16 | Method for eliminating longitudinal indentation of new roller tying machine of thermal straightening machine |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003039113A (en) * | 2001-07-24 | 2003-02-12 | Kobe Steel Ltd | Roller leveler |
| KR20120073531A (en) * | 2010-12-27 | 2012-07-05 | 주식회사 포스코 | Structure of back up roll of leveller |
| CN103394519A (en) * | 2013-07-10 | 2013-11-20 | 内蒙古包钢钢联股份有限公司 | Method for controlling shapes of thin steel plates |
| CN203695656U (en) * | 2013-12-23 | 2014-07-09 | 南阳汉冶特钢有限公司 | Improved straightener support roller |
| CN104148384A (en) * | 2014-08-21 | 2014-11-19 | 柳州钢铁股份有限公司 | Rolling technology method for ultra-thin ultra-wide steel plate |
-
2022
- 2022-05-16 CN CN202210527376.2A patent/CN114669628B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003039113A (en) * | 2001-07-24 | 2003-02-12 | Kobe Steel Ltd | Roller leveler |
| KR20120073531A (en) * | 2010-12-27 | 2012-07-05 | 주식회사 포스코 | Structure of back up roll of leveller |
| CN103394519A (en) * | 2013-07-10 | 2013-11-20 | 内蒙古包钢钢联股份有限公司 | Method for controlling shapes of thin steel plates |
| CN203695656U (en) * | 2013-12-23 | 2014-07-09 | 南阳汉冶特钢有限公司 | Improved straightener support roller |
| CN104148384A (en) * | 2014-08-21 | 2014-11-19 | 柳州钢铁股份有限公司 | Rolling technology method for ultra-thin ultra-wide steel plate |
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