CN115505724A - Control method for removing bottom depression of steel billet in heating furnace - Google Patents
Control method for removing bottom depression of steel billet in heating furnace Download PDFInfo
- Publication number
- CN115505724A CN115505724A CN202211142472.1A CN202211142472A CN115505724A CN 115505724 A CN115505724 A CN 115505724A CN 202211142472 A CN202211142472 A CN 202211142472A CN 115505724 A CN115505724 A CN 115505724A
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- movable beam
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 66
- 239000010959 steel Substances 0.000 title claims abstract description 66
- 238000010438 heat treatment Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000001174 ascending effect Effects 0.000 claims description 20
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Tunnel Furnaces (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The invention provides a control method for removing the bottom depression of a steel billet in a heating furnace, which not only improves the moving speed of the steel billet in the heating furnace, but also reduces the impact of a movable beam and a fixed beam on the steel billet and avoids the generation of pits on the surface of the steel billet; in conclusion, the invention improves the working efficiency of the heating furnace and improves the heating quality of the billet steel.
Description
Technical Field
The invention relates to the technical field of heating furnaces, in particular to a control method for removing bottom depression of a steel billet in a heating furnace.
Background
The heating furnace generally drives the billet to move through a walking beam. The walking beam comprises a fixed beam and a movable beam, and the lifting height of the fixed beam relative to the upper end surface of the movable beam is plus or minus 100mm when the fixed beam runs.
Because the internal temperature of the heating furnace is overhigh, if the speed of the movable beam is overhigh in the rising process, large impact can be caused on the bottom surface of the steel billet, and the bottom surface of the steel billet can be formed; in the descending process, if the speed is too high, the impact of the billet on the fixed beam is also large, and the pit defect is formed on the bottom surface of the billet by the reaction force of the fixed beam. Therefore, scabs are formed on the surface of a finished product after the billet is rolled, and the quality of the finished product is influenced.
However, if the running speed of the movable beam is too slow, the production efficiency of the product is affected.
Therefore, how to improve the production efficiency of the billet without generating pit defects becomes a problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In order to solve the technical problem in the background technology, the invention discloses a control method for removing the bottom depression of a steel billet in a heating furnace.
The invention provides a control method for removing bottom depression of a steel billet in a heating furnace, which comprises the following steps:
s1, setting the lowest position of a movable beam to be 0 at a position 100mm below the upper end surface of a fixed beam, and setting the highest position of the movable beam to be 200mm;
s2, setting the ascending distance of the movable beam to be 0-L1, setting the L1 to be 70-88 mm, and setting the speed to be 16.4-17.3 mm/S; in the process, the movable beam does not contact the steel billet, so that the movable beam quickly rises to improve the efficiency;
if the heating time of the billet is below 300 minutes, executing the step S3a, and then executing the step S5; the reason is as follows: the hardness of the steel billet is higher; if the heating time of the billet is more than 300 minutes, sequentially executing the steps S3b and S4b, and then executing the step S5; the reason is as follows: the hardness of such billets is relatively low; the arrangement is used for avoiding the generation of a pit on the surface of the steel billet due to the generation of overlarge impact between the movable beam and the steel billet;
s3a, setting the ascending distance of the movable beam to be L1-170 mm and the speed to be 13.6-14.5 mm/S;
s3b, setting the ascending distance of the movable beam to be L1-115 mm and setting the speed to be 10.9-12.7 mm/S;
s4b, setting the ascending distance of the movable beam to be 115-170 mm and the speed to be 13.6-15.5 mm/S;
s5, setting the rising distance of the movable beam to be 170-200 mm and the speed to be 12.7mm/S; at this stage, the oil cylinder decelerates to avoid collision between the piston and the cylinder body;
s6, moving the movable beam forwards;
s7, setting the descending distance of the movable beam to be 200-L2, setting the L2 to be 125-109 mm, and setting the speed to be 16.7-18 mm/S; in the process, the steel billet is positioned on the movable beam and does not contact the fixed beam, so that the steel billet can be quickly lowered to improve the efficiency;
s8, setting the descending distance of the movable beam to be L2-L3, setting the L3 to be 80-82 mm, and setting the speed to be 12.7-15.5 mm/S; in the process, the movable beam continuously descends, the steel billet is placed on the fixed beam, the speed is reduced, and the condition that the steel billet generates a pit due to overlarge impact between the steel billet and the fixed beam is avoided;
s9, setting the descending distance of the movable beam to be L3-20 mm and the speed to be 17.3mm/S; in the process, the movable beam is quickly descended after being separated from the steel billet, so that the efficiency is improved;
s10, setting the descending distance of the movable beam to be 20 mm-0 and setting the speed to be 12.7mm/S; in the process, the oil cylinder decelerates to avoid collision between the piston and the cylinder body;
and S11, retreating and resetting the movable beam.
Under the action of the steps, the moving speed of the steel billet in the heating furnace is improved, the impact of the movable beam and the fixed beam on the steel billet is reduced, and pits are prevented from being generated on the surface of the steel billet; in conclusion, the invention improves the working efficiency of the heating furnace and improves the heating quality of the billet steel.
Detailed Description
The walking beam structure in the heating furnace in this embodiment is as follows: the width of the movable beam is 60mm. The movable beam is driven to lift through the first oil cylinder and is driven to move horizontally through the second oil cylinder, and advancing and retreating are achieved. The stroke of the first oil cylinder is 1100mm, and the running direction of a piston rod of the first oil cylinder forms an included angle with the translation direction of the movable beam, so that the lifting height of the movable beam is 200mm. The lowest part of the movable beam is arranged at a position 100mm below the upper end surface of the fixed beam and is set as 0, and the highest part of the movable beam is set as 200mm. The extension and retraction speeds of the piston rods in the first oil cylinder and the second oil cylinder are controlled by proportional valves.
The first embodiment is as follows:
the invention discloses a control method for removing bottom depression of a steel billet in a heating furnace, wherein the steel is bearing steel SUJ2, the heating temperature is 1210-1250 ℃, and the heating time is 327 minutes; the method comprises the following steps:
s1, the extension stroke of a first oil cylinder is 0-485 mm, and the speed of the first oil cylinder is 92mm/S, so that the ascending distance of a movable beam is 0-88 mm, and the speed is 16.7mm/S; in the process, the movable beam does not contact the steel billet, so that the movable beam quickly rises to improve the efficiency;
s2, the extension stroke of the first oil cylinder is 485-635 mm, and the speed of the first oil cylinder is set to 70mm/S, so that the ascending distance of the movable beam is 88-115 mm, and the speed is set to 12.7mm/S; the heating temperature of the steel billet is high, the hardness of the steel billet is low, and the arrangement avoids the generation of overlarge impact between the movable beam and the steel billet to cause the generation of pits on the surface of the steel billet;
s3, setting the extending stroke of the first oil cylinder to be 635-935 mm and the speed to be 85mm/S, so that the ascending distance of the movable beam is 115-170 mm, and the speed is 15.5mm/S; at this stage, the steel billet is already positioned on the movable beam and quickly rises, so that the efficiency can be improved;
s4, the extension stroke of the first oil cylinder is 935-1100 mm, and the speed is set to be 70mm/S, so that the ascending distance of the movable beam is 170-200 mm, and the speed is set to be 12.7mm/S; at this stage, the oil cylinder decelerates to avoid collision between the piston and the cylinder body;
s5, the second oil cylinder drives the first oil cylinder and the movable beam to integrally move forwards;
s6, setting the retraction stroke of the first oil cylinder to be 1100-600 mm and the speed to be 93mm/S, so that the descending distance of the movable beam is 200-109 mm and the speed is 16.9mm/S; in the process, the steel billet is positioned on the movable beam and does not contact the fixed beam, so that the steel billet can be quickly lowered to improve the efficiency;
s7, setting the retraction stroke of the first oil cylinder to be 600-450 mm and the speed to be 82mm/S, so that the descending distance of the movable beam is 109-82 mm and the speed is 14.9mm/S; in the process, the movable beam continuously descends, and the steel billet is placed on the fixed beam, so that the speed is reduced, and the condition that the steel billet generates a pit due to overlarge impact between the steel billet and the fixed beam is avoided;
s8, setting the retraction stroke of the first oil cylinder to be 450-110 mm and the speed to be 95mm/S, so that the descending distance of the movable beam is 82-20 mm and the speed is 17.3mm/S; in the process, the movable beam is quickly descended after being separated from the steel billet so as to improve the efficiency;
s9, setting the retraction stroke of the first oil cylinder to be 110 mm-0 and the speed to be 70mm/S, so that the descending distance of the movable beam is 20 mm-0 and the speed is 12.7mm/S; in the process, the oil cylinder decelerates to avoid collision between the piston and the cylinder body;
and S10, retreating and resetting the movable beam.
Under the action of the steps, the moving speed of the steel billet in the heating furnace is improved, the impact of the movable beam and the fixed beam on the steel billet is reduced, and pits are prevented from being generated on the surface of the steel billet; in conclusion, the invention improves the working efficiency of the heating furnace and improves the heating quality of the billet steel.
Example two:
compared with the first embodiment, the differences are as follows:
the steel grade is bearing steel GCr15, the heating temperature is 1210-1250 ℃, and the heating time is 362 minutes;
s1, the extension stroke of a first oil cylinder is 0-385 mm, and the speed of the first oil cylinder is set to be 90mm/S, so that the ascending distance of a movable beam is 0-70 mm, and the speed is 16.4mm/S;
s2, setting the extension stroke of the first oil cylinder to 385-635 mm and the speed of the first oil cylinder to be 60mm/S, so that the ascending distance of the movable beam is 70-115 mm and the speed is 10.9mm/S;
s3, setting the extension stroke of the first oil cylinder to be 635-935 mm and the speed to be 75mm/S, so that the ascending distance of the movable beam is 115-170 mm and the speed is 13.6mm/S;
s6, setting the retracting stroke of the first oil cylinder to be 1100-687 mm and the speed to be 92mm/S, so that the descending distance of the movable beam is 200-125 mm and the speed is 16.7mm/S;
s7, setting the retracting stroke of the first oil cylinder to be 687-440 mm, setting the speed of the first oil cylinder to be 70mm/S, and accordingly setting the descending distance of the movable beam to be 125-80 mm and the speed to be 12.7mm/S;
s8, setting the retracting stroke of the first oil cylinder to be 440-110 mm and the speed to be 95mm/S, so that the descending distance of the movable beam is 80-20 mm and the speed is 17.3mm/S;
example three:
the invention also discloses a control method for removing the bottom depression of the steel billet in the heating furnace, wherein the steel grade is alloy steel SA-210C, the heating temperature is 1080-1230 ℃, and the heating time is 141 minutes; the method comprises the following steps:
s1, the extension stroke of a first oil cylinder is 0-485 mm, and the speed of the first oil cylinder is set to be 95mm/S, so that the ascending distance of a movable beam is 0-88 mm, and the speed is 17.3mm/S; in the process, the movable beam does not contact the steel billet, so that the movable beam quickly rises to improve the efficiency;
s2, the extension stroke of the first oil cylinder is 485-935 mm, and the speed is set to be 80mm/S, so that the ascending distance of the movable beam is 88-170 mm, and the speed is set to be 14.5mm/S; by the arrangement, the phenomenon that a pit is generated on the surface of the steel billet due to overlarge impact between the movable beam and the steel billet is avoided; the billet steel has lower heating temperature, higher hardness and stronger impact resistance;
s3, the extending stroke of the first oil cylinder is 935-1100 mm, and the speed is set to be 70mm/S, so that the ascending distance of the movable beam is 170-200 mm, and the speed is set to be 12.7mm/S; at this stage, the oil cylinder decelerates to avoid collision between the piston and the cylinder body;
s4, the second oil cylinder drives the first oil cylinder and the movable beam to integrally move forwards;
s5, setting the retraction stroke of the first oil cylinder to be 1100-650 mm and the speed to be 99mm/S, so that the descending distance of the movable beam is 200-118 mm and the speed is 18mm/S; in the process, the steel billet is positioned on the movable beam and does not contact the fixed beam, so that the steel billet can be quickly lowered to improve the efficiency;
s6, setting the retraction stroke of the first oil cylinder to be 650-440 mm and the speed to be 70mm/S, so that the descending distance of the movable beam is 118-80 mm and the speed is 12.7mm/S; in the process, the movable beam continuously descends, and the steel billet is placed on the fixed beam, so that the speed is reduced, and the condition that the steel billet generates a pit due to overlarge impact between the steel billet and the fixed beam is avoided;
s7, setting the retracting stroke of the first oil cylinder to be 440-110 mm, and setting the speed to be 95mm/S, so that the descending distance of the movable beam is 80-20 mm, and the speed is 17.3mm/S; in the process, the movable beam is quickly descended after being separated from the steel billet so as to improve the efficiency;
s9, setting the retraction stroke of the first oil cylinder to be 110 mm-0 and the speed to be 70mm/S, so that the descending distance of the movable beam is 20 mm-0 and the speed is 12.7mm/S; in the process, the oil cylinder decelerates to avoid collision between the piston and the cylinder body;
and S10, retreating and resetting the movable beam.
Under the action of the steps, the moving speed of the steel billet in the heating furnace is improved, the impact of the movable beam and the fixed beam on the steel billet is reduced, and pits are prevented from being generated on the surface of the steel billet; in conclusion, the invention improves the working efficiency of the heating furnace and improves the heating quality of the billet steel.
Example four:
compared with the three phases of the embodiment, the differences are as follows:
the steel grade is alloy steel 20MnCr5H, the temperature is 1150-1230 ℃, and the heating time is 141 minutes;
s6, setting the retraction stroke of the first oil cylinder to be 650-440 mm and the speed to be 82mm/S, so that the descending distance of the movable beam is 118-80 mm and the speed is 14.9mm/S;
example five:
compared with the three phases of the embodiment, the differences are as follows:
the steel grade is spring steel 60Si2Mn, the temperature is 1150-1200 ℃, and the heating time is 152 minutes;
s2, the extension stroke of the first oil cylinder is 485-935 mm, and the speed is set to be 75mm/S, so that the ascending distance of the movable beam is 88-170 mm, and the speed is set to be 13.6mm/S;
s5, setting the retraction stroke of the first oil cylinder to be 1100-650 mm and the speed to be 93mm/S, so that the descending distance of the movable beam is 200-118 mm and the speed is 16.9mm/S;
s6, setting the retracting stroke of the first oil cylinder to be 650-440 mm, and setting the speed to be 85mm/S, so that the descending distance of the movable beam is 118-80 mm, and the speed is 15.5mm/S;
in light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (1)
1. A control method for removing bottom depression of a steel billet in a heating furnace is characterized by comprising the following steps:
s1, setting the lowest position of a movable beam to be 0 at a position 100mm below the upper end surface of a fixed beam, and setting the highest position of the movable beam to be 200mm;
s2, setting the ascending distance of the movable beam to be 0-L1, setting the L1 to be 70-88 mm, and setting the speed to be 16.4-17.3 mm/S;
if the heating time of the billet is below 300 minutes, executing the step S3a, and then executing the step S5; if the heating time of the billet is more than 300 minutes, sequentially executing the steps S3b and S4b, and then executing the step S5;
s3a, setting the ascending distance of the movable beam to be L1-170 mm and the speed to be 13.6-14.5 mm/S;
s3b, setting the ascending distance of the movable beam to be L1-115 mm and setting the speed to be 10.9-12.7 mm/S;
s4b, setting the ascending distance of the movable beam to be 115-170 mm and the speed to be 13.6-15.5 mm/S;
s5, setting the ascending distance of the movable beam to be 170-200 mm and the speed to be 12.7mm/S;
s6, moving the movable beam forwards;
s7, setting the descending distance of the movable beam to be 200-L2, the L2 to be 125-109 mm and the speed to be 16.7-18 mm/S;
s8, setting the descending distance of the movable beam to be L2-L3, setting the L3 to be 80-82 mm, and setting the speed to be 12.7-15.5 mm/S;
s9, setting the descending distance of the movable beam to be L3-20 mm and the speed to be 17.3mm/S;
s10, setting the descending distance of the movable beam to be 20 mm-0 and setting the speed to be 12.7mm/S;
and S11, retreating and resetting the movable beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211142472.1A CN115505724A (en) | 2022-09-20 | 2022-09-20 | Control method for removing bottom depression of steel billet in heating furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211142472.1A CN115505724A (en) | 2022-09-20 | 2022-09-20 | Control method for removing bottom depression of steel billet in heating furnace |
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| CN115505724A true CN115505724A (en) | 2022-12-23 |
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| CN202211142472.1A Pending CN115505724A (en) | 2022-09-20 | 2022-09-20 | Control method for removing bottom depression of steel billet in heating furnace |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1979364A (en) * | 2005-12-06 | 2007-06-13 | 邹高能 | Precision digital step controller |
| JP2007191750A (en) * | 2006-01-18 | 2007-08-02 | Daido Steel Co Ltd | Steel slab heating method in walking beam heating furnace |
| CN101369154A (en) * | 2008-05-17 | 2009-02-18 | 马鞍山钢铁股份有限公司 | Walking beam parallel movement control method |
| CN104181852A (en) * | 2014-08-22 | 2014-12-03 | 重庆钢铁集团电子有限责任公司 | Automatic steel loading control method of heat accumulating type stepping heating furnace |
| CN104178622A (en) * | 2014-08-22 | 2014-12-03 | 重庆钢铁集团电子有限责任公司 | Walking beam control method of regenerative stepping reheating furnace |
| CN112322887A (en) * | 2020-10-26 | 2021-02-05 | 北京首钢股份有限公司 | Positive circulation control method and device for heating furnace walking beam |
-
2022
- 2022-09-20 CN CN202211142472.1A patent/CN115505724A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1979364A (en) * | 2005-12-06 | 2007-06-13 | 邹高能 | Precision digital step controller |
| JP2007191750A (en) * | 2006-01-18 | 2007-08-02 | Daido Steel Co Ltd | Steel slab heating method in walking beam heating furnace |
| CN101369154A (en) * | 2008-05-17 | 2009-02-18 | 马鞍山钢铁股份有限公司 | Walking beam parallel movement control method |
| CN104181852A (en) * | 2014-08-22 | 2014-12-03 | 重庆钢铁集团电子有限责任公司 | Automatic steel loading control method of heat accumulating type stepping heating furnace |
| CN104178622A (en) * | 2014-08-22 | 2014-12-03 | 重庆钢铁集团电子有限责任公司 | Walking beam control method of regenerative stepping reheating furnace |
| CN112322887A (en) * | 2020-10-26 | 2021-02-05 | 北京首钢股份有限公司 | Positive circulation control method and device for heating furnace walking beam |
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