CN114669628B - Method for eliminating longitudinal indentation of new roller tying machine of thermal straightening machine - Google Patents
Method for eliminating longitudinal indentation of new roller tying machine of thermal straightening machine Download PDFInfo
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- CN114669628B CN114669628B CN202210527376.2A CN202210527376A CN114669628B CN 114669628 B CN114669628 B CN 114669628B CN 202210527376 A CN202210527376 A CN 202210527376A CN 114669628 B CN114669628 B CN 114669628B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000007373 indentation Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 238000005498 polishing Methods 0.000 claims abstract description 17
- 229910000746 Structural steel Inorganic materials 0.000 claims description 12
- 238000005452 bending Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 4
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000005096 rolling process Methods 0.000 abstract description 8
- 206010020112 Hirsutism Diseases 0.000 abstract description 5
- 230000001154 acute effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 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
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
Classifications
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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 of a new roller system upper machine of a thermal straightener, which specifically comprises the following steps: polishing and changing the end face chamfer of the supporting roller of the hot straightening roller system; step two: the rolling steel plate is specially planned after the new roll system is put on the machine for at least 2 days, and a special straightening strategy is carried out based on the planning of the rolling steel plate, so that the hot straightening new roll system can quickly and efficiently obtain a stable running-in state, the surface quality of the steel plate is good, the hairiness of the roll surface of a working roll of the new roll system of the hot straightening machine is eliminated, the manual polishing working procedure is reduced, and the production efficiency of thick plates is improved. By using the technical method, the longitudinal indentation generated by the new roller system of the thick plate hot straightening machine is solved, the hairiness of the hot straightening new roller system can be effectively controlled, the longitudinal indentation brought by the surface on the steel plate is eliminated, the stable running state of equipment after the new roller system is installed 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 technology for controlling longitudinal indentation of a new roller system of the thick plate straightener.
Background
The quality indexes of the current medium plate product mainly comprise four aspects of size and shape precision, surface quality, mechanical property and plate shape, wherein 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 sheet has a good shape, the steel sheet often needs to be straightened by a hot straightener after rolling. For example, a thick plate hot straightening machine of Simak normally has a roll changing period of 3 months, and the problem that a new roll system is worn in needs to be faced after the new roll system is put on the machine every time.
After a new roller of the hot straightening machine is tied on the machine, the phenomenon that a straightened steel plate has longitudinal indentation frequently occurs in the production operation of a thick plate, a plurality of longitudinal indentations are easy to appear on the upper surface of the steel plate and are distributed in a fine line shape, and the contact end surface of a working roller and a supporting roller of the hot straightening machine is easy to scratch or generate hairiness. In the production process, the hot leveling roller system which is newly put on the machine is required to be stopped and polished for 2-3 times every day because the working roller surface of the hot leveling roller system is roughened in the first two weeks after the machine is put on the machine and even lasts for three weeks, and the polishing time is even 2 hours when the stopping and polishing time is up to 15-30 minutes each time and the polishing time is severe.
The length of the working roll surface in the upper roll system of the hot straightening machine is 4500mm, the length of the supporting roll surface is 435mm, the length of the supporting roll bearing seat is 278mm, the end parts of each supporting roll are in line-surface contact with the working roll surface, stress concentration is easy to occur, the working roll surface is damaged, and the damaged part is symmetrical about the center line of the working roll, as shown in figure 1.
The positions of the working roll marks correspond to the edge positions of the middle supporting rolls, the transmission side is taken as an example, the positions which are 217.5mm, 495.5mm, 930.5mm and 1208.5mm away from the center deviation transmission are more consistent with the hot-straightening marks of the thick plate, and the more the working roll marks are close to the center, the more easily the marks are generated, and the more obvious the marks are. Therefore, the longitudinal indentation of the thermal straightener is matched with the damage of the working roll surface caused by the line-surface contact of the supporting roll and the working roll.
The problem of running in the hot leveling roll system after the hot leveling roll system is put on the machine has been plagued the production of thick plates. This phenomenon has four adverse effects that constitute:
(1) The surface quality risk of batch 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, the rolling rhythm and hot charging and hot feeding are disturbed;
(4) And extra workload of the staff is increased, so that the labor amplitude is increased.
The conventional common longitudinal indentation control method for the hot straightening new roller system machine is to grind the hot straightening machine roller system manually, grind the upper surface of an indentation steel plate so as to maintain production on site, and the control mode often causes the interruption of thick plate production and brings adverse effects to the production exertion and the stable and smooth operation on site. The principle of the prior art method is simpler, and mainly solves the problems that after a new roll system of a thermal straightener is put on the machine, the roll surface of a working roll of the thermal straightener is subjected to 'roughening' and the indentation generated on a steel plate are manually polished, and management and control are carried out by sacrificing manpower and productivity and facing batch quality risk cost. However, from the aspect of actual production operation on site, the control mode belongs to "post-hoc" and "passive" control, and the mode of manual grinding has an influence on the surface quality of the steel plate, and the damage of the service life of the roller system is long-term, so that the roller system is worn, and the maintenance cost of the on-site production equipment is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for eliminating longitudinal indentation of a new roller system upper machine of a hot straightening machine for a thick plate. The method mainly solves the defects of contact stress distribution of the hot straightening roller system and control method after longitudinal indentation is generated in the running-in process of the hot straightening roller system, adopts the thought of 'pre-control', realizes elimination of the longitudinal indentation of the hot straightening roller system of a new machine by planning, arranging and selecting and straightening strategy change, obtains good surface quality of a steel plate, reduces abnormal shutdown such as manual polishing and the like, and better meets the use requirements of users.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for eliminating longitudinal indentation of a new roller system upper machine of a thermal straightener comprises the following steps:
step one: polishing and changing the end face chamfer of the supporting roller of the hot straightening roller system; by changing the chamfering of the end face of the support roller, the small acute angle generated after chamfering of the online equipment can be eliminated, the stress concentration between the end face of the support roller and the roller face of the working roller is reduced, and the arc contact is realized.
Step two: the rolled steel sheet was planned as follows at least 2 days after the new roll system was put on machine:
(1) The front 20 blocks are provided with common structural steel with the width specification of 2200-2800 mm;
(2) 21-30 blocks of common structural steel with the width specification of 2500-3000 mm are arranged;
(3) 31-40 blocks of common structural steel with the width specification of 3000-3600 mm;
(4) After 40 pieces of steel, a variety of steel, a thin plate with the thickness of less than 8mm, a TMCP plate and a special thick plate are not arranged except for a non-water spraying plate with the finishing temperature of more than or equal to 780 ℃; not arranging steel grades with high surface requirements;
the straightening strategy based on the planning of the rolled steel plate is as follows:
(1) The front 20 pieces are not straightened by hot straightening, all the pieces are emptied, each piece of steel is emptied back and forth for 3 times, and the hot straightening roll surface is baked; the surface of the hot straightening roller is promoted to turn blue, so that a compact oxide film is formed on the surface of the hot straightening roller system, and a stable running-in stage is established.
(2) 21-50 blocks, adopting manual intervention straightening force, wherein the straightening force is less than or equal to 80 tons, and disabling transverse tilting and bending rollers;
(3) 51 blocks are backwards, and until a new roller is tied on the machine for 1 day, manual intervention straightening force is adopted, the straightening force is less than or equal to 150 tons, and transverse tilting and roller bending are forbidden;
(4) The new roll is tied on the machine for 2 days and several days later, light straightening or normal straightening is selected according to the straightening condition effect of the previous 1 day, and transverse tilting and bending rolls can be selected.
Further, the first step specifically comprises: and polishing the chamfer angles of the new roller system corresponding to the end surfaces of the supporting rollers into the same or similar chamfer angles according to the measured chamfer angle data of the end surfaces of the supporting rollers after the old roller system is worn.
Further, the first step specifically comprises: and (3) chamfering and polishing the end face of the supporting roller of the hot straightening roller system to R=3mm.
Further, only four end chamfers near the center line of the roller train are ground.
Further, the end face chamfer polishing is carried out before the new roller system of the thermal straightener is assembled.
The method is suitable for the hot straightener with the length of 4500mm of the roll surface of the working roll.
The beneficial effects of the invention are as follows: the invention adopts the methods of changing the chamfering angle of the end surface of the supporting roller, arranging and 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 a steel plate is good, the hairiness of the roller surface of a new roller system working roller of a hot straightening machine is eliminated, the manual polishing working procedure is reduced, and the production efficiency of thick plates is improved. By using the technical method, the longitudinal indentation generated by the new roller system of the thick plate hot straightening machine is solved, the hairiness of the hot straightening new roller system can be effectively controlled, the longitudinal indentation brought by the surface on the steel plate is eliminated, the stable running state of equipment after the new roller system is installed 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 train construction of a thermal straightener;
reference numerals in the figures: 1-center line and 2-support roller end face chamfering.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The four-fold straightening machine has the following main equipment parameters: 5 upper working rolls, 6 lower working rolls and 285mm working roll diameter, and the length of the working rolls is 4500mm. The number of the upper supporting rollers and the number of the lower supporting rollers are 30, and the diameter of the supporting rollers is 300mm. Maximum straightening force 34000KN. The width of the straightening steel plate can be 1200 to 4250mm, the thickness can be 5 to 120mm, the straightening temperature can be 300 to 1050 ℃, and the straightening speed can be 0 to 2.5m/s.
(1) Improvement of equipment structure
The end face chamfering 2 of the supporting roller is changed from original R=2.5mm to R=3mm, and chamfering 2 is manually polished before assembly is completed, so that small acute angles generated after the chamfering 2 of the online equipment are eliminated, and arc contact is realized.
(2) Planning of rolled steel plates:
first 20 blocks of common structural steel Q345B with the width specification of 2450-2650mm;
21-30 blocks of common structural steel Q345B with the width specification of 2550-2950 mm;
31-40 blocks of common structural steel Q345B with the width specification of 3100-3400 mm;
and (IV) after 40 blocks, normally arranging a rolling plan according to the specification.
(3) Straightening strategy of hot straightener
The first 20 blocks are not straightened and all are emptied, each steel is emptied back and forth for 3 times, the hot straightening roll surface is baked, the roll gap height is 300mm, the straightening speed is 0.8m/s, the hot straightening roll surface is enabled to turn blue, and the thickness range is 40-60 mm;
21-50 blocks, adopting manual intervention straightening force, wherein the straightening force is 40-80 tons, and disabling the transverse tilting and bending roller;
thirdly, 51 blocks are backwards carried out until 1 day, manual intervention straightening force is adopted, the straightening force is 100-150 tons, and transverse tilting and roller bending are forbidden;
after day 2, straightening was normal, with a small use 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 no manual shutdown polishing is performed.
Example two
The four-fold straightening machine has the following main equipment parameters: 5 upper working rolls, 6 lower working rolls and 285mm working roll diameter, and the length of the working rolls is 4500mm. The number of the upper supporting rollers and the number of the lower supporting rollers are 30, and the diameter of the supporting rollers is 300mm. Maximum straightening force 34000KN. The width of the straightening steel plate can be 1200 to 4250mm, the thickness can be 5 to 120mm, the straightening temperature can be 300 to 1050 ℃, and the straightening speed can be 0 to 2.5m/s.
(1) Improvement of equipment structure
The end face chamfering 2 of the supporting roller is changed from original R=2.5mm to R=3mm, and chamfering 2 is manually polished before assembly is completed, so that small acute angles generated after the chamfering 2 of the online equipment are eliminated, and arc contact is realized.
(2) Planning of rolled steel plates:
firstly, arranging a common structural steel BSM48C with a width specification of 2200-2450mm in the front 20 blocks;
21-30 common structural steel Q235B with width specification 2525-2850 mm;
30-40 blocks of common structural steel Q235B with the width specification of 3150-3500 mm;
and (IV) after 40 blocks, normally arranging a rolling plan according to the specification.
(3) Straightening strategy of hot straightener
The first 20 blocks are not straightened and all are emptied, each steel is emptied back and forth for 3 times, the hot straightening roll surface is baked, the roll gap height is 300mm, the straightening speed is 0.8m/s, the hot straightening roll surface is enabled to turn blue, and the thickness range is 25-50 mm;
21-50 blocks, adopting manual intervention straightening force, wherein the straightening force is 30-70 tons, and disabling the transverse tilting and bending roller;
thirdly, 51 blocks are backwards carried out until 1 day, manual intervention straightening force is adopted, the straightening force is 80-130 tons, and transverse tilting and roller bending are forbidden;
after day 1.5, straightening was normal, with a small use 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 no manual shutdown polishing is performed.
The foregoing is merely illustrative of the present invention, and simple modifications and equivalents may be made thereto by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (5)
1. A method for eliminating longitudinal indentation of a new roller system upper machine of a thermal straightener is characterized by comprising the following steps: the method specifically comprises the following steps:
step one: polishing and changing the end face chamfer of the supporting roller of the hot straightening roller system;
step two: the rolled steel sheet was planned as follows at least 2 days after the new roll system was put on machine:
(1) The front 20 blocks are provided with common structural steel with the width specification of 2200-2800 mm;
(2) 21-30 blocks of common structural steel with the width specification of 2500-3000 mm are arranged;
(3) 31-40 blocks of common structural steel with the width specification of 3000-3600 mm;
(4) After 40 pieces of steel, a variety of steel, a thin plate with the thickness of less than 8mm, a TMCP plate and a special thick plate are not arranged except for a non-water spraying plate with the finishing temperature of more than or equal to 780 ℃; not arranging steel grades with high surface requirements;
the straightening strategy based on the planning of the rolled steel plate is as follows:
(1) The front 20 pieces are not straightened by hot straightening, all the pieces are emptied, each piece of steel is emptied back and forth for 3 times, and the hot straightening roll surface is baked;
(2) 21-50 blocks, adopting manual intervention straightening force, wherein the straightening force is less than or equal to 80 tons, and disabling transverse tilting and bending rollers;
(3) 51 blocks are backwards, and until a new roller is tied on the machine for 1 day, manual intervention straightening force is adopted, the straightening force is less than or equal to 150 tons, and transverse tilting and roller bending are forbidden;
(4) The new roll is tied on the machine for 2 days and several days later, light straightening or normal straightening is selected according to the straightening condition effect of the previous 1 day, and transverse tilting and bending rolls can be selected.
2. The method for eliminating longitudinal impression of new roll-set machine of thermal straightener according to claim 1, characterized in that: the first step is specifically as follows: and polishing the chamfer angles of the new roller system corresponding to the end surfaces of the supporting rollers into the same or similar chamfer angles according to the measured chamfer angle data of the end surfaces of the supporting rollers after the old roller system is worn.
3. The method for eliminating longitudinal impression of new roll-set machine of thermal straightener according to claim 1, characterized in that: the first step is specifically as follows: and (3) chamfering and polishing the end face of the supporting roller of the hot straightening roller system to R=3mm.
4. A method for eliminating longitudinal impression of new roll-set machine of thermal straightener according to claim 3, characterized in that: only four end chamfers near the center line of the roller system are polished.
5. The method for eliminating longitudinal impression of new roll-set machine of thermal straightener according to claim 2,3 or 4, characterized in that: and polishing the end face chamfer before the new roller of the thermal straightener is assembled.
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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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| CN114669628B true CN114669628B (en) | 2023-11-24 |
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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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