CN115404332A - Ultrathin high-strength plate strip steel heat treatment temperature supplementing device and method - Google Patents
Ultrathin high-strength plate strip steel heat treatment temperature supplementing device and method Download PDFInfo
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- CN115404332A CN115404332A CN202211141815.2A CN202211141815A CN115404332A CN 115404332 A CN115404332 A CN 115404332A CN 202211141815 A CN202211141815 A CN 202211141815A CN 115404332 A CN115404332 A CN 115404332A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 139
- 239000010959 steel Substances 0.000 title claims abstract description 139
- 238000010438 heat treatment Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 55
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 31
- 238000010791 quenching Methods 0.000 claims abstract description 58
- 230000000171 quenching effect Effects 0.000 claims abstract description 58
- 238000005485 electric heating Methods 0.000 claims abstract description 31
- 238000009413 insulation Methods 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 239000002893 slag Substances 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 241000270295 Serpentes Species 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- -1 iron-chromium-aluminum Chemical compound 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 10
- 229910000734 martensite Inorganic materials 0.000 abstract description 9
- 230000009466 transformation Effects 0.000 abstract description 7
- 238000001556 precipitation Methods 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 5
- 238000005496 tempering Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000006032 tissue transformation Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Crystallography & Structural Chemistry (AREA)
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention belongs to the technical field of steel heat treatment, and provides a temperature supplementing device and a temperature supplementing method for heat treatment of ultrathin high-strength plate strip steel. The temperature compensating device consists of a heat insulation shell, a transmission system and a temperature compensating system, the temperature compensating method consists of a temperature control method and a speed control method, a control unit formulates temperature compensating procedures and controls an electric heating belt to heat and a transmission motor to rotate, so that the automatic temperature compensation after the strip steel is taken out of the heat treatment furnace is realized, and the process requirements of the cold starting temperature before quenching, the air cooling temperature reduction of the strip steel and the like are met. The invention effectively avoids the unfavorable structure transformation such as non-martensite phase transformation, coarse crystal grains, carbide precipitation and the like before the quenching of the plate strip steel, improves the quenching plate shape, the residual stress after the quenching, the performance uniformity and the toughness performance of the ultra-thin high-strength plate strip steel, and improves the heat treatment quality of the plate strip steel.
Description
Technical Field
The invention relates to the technical field of steel heat treatment, in particular to a temperature supplementing device and a temperature supplementing method for heat treatment of ultrathin high-strength plate strip steel.
Background
Quenching and tempering heat treatment is a key process for improving the toughness and the special service performance of the extremely-thin high-strength plate strip steel. After the plate and strip steel is rolled and formed, the crystal grains of the plate and strip steel are refined and the carbide distribution is homogenized through austenitizing and heating (normalizing), then martensite or lower bainite tissue is obtained through quenching at the speed higher than the critical cooling speed so as to improve the toughness and the special service performance, finally the quenched tissue is transformed into a stable tempered tissue through tempering, the internal stress of the plate and strip steel is eliminated, and the corresponding tissue transformation and toughness matching are ensured. The plate strip steel quenching and tempering heat treatment (normalizing, quenching and tempering) process realizes different process paths through a complex heating-cooling system, fully exerts comprehensive strengthening and toughening mechanisms of fine grains, phase change, precipitation, solid solution, element diffusion and the like, improves the strength of the plate strip steel by times, improves the toughness, stress distribution and performance uniformity, meets the regulation and control requirements of different tissues of fine grains, dispersion precipitation, gradient structures, composite phase change and the like, and endows the material with new service performance.
With the reduction of the thickness of the plate strip steel (for example, the thickness is 1-4 mm) and the improvement of the strength grade (for example, the yield strength is more than 1000 MPa), the heat treatment sensitivity is obviously increased, the problems of large residual stress, large heat treatment distortion, substandard toughness, poor surface quality and the like are easy to occur, the heat treatment yield and the production efficiency are influenced, even the plate strip steel of certain specifications and certain varieties cannot be subjected to quenching and tempering heat treatment production, and the research, development and application of the ultra-thin high-strength plate strip steel are limited. Production practices show that the transfer time (air cooling time) from the time when the plate strip steel is discharged from the normalizing furnace to the time when the plate strip steel enters the quenching equipment and the temperature before the plate strip steel is quenched directly determine the structure and the performance of the plate strip steel after quenching, and under the condition of the technical level of the existing equipment, the transfer time and the temperature before the plate strip steel is quenched are in an inverse proportion relation. When the thickness of the plate strip steel is reduced to 1-4 mm, the temperature of the plate strip steel is rapidly reduced in the transfer time, even the temperature before quenching is lower than the austenite decomposition temperature (Ar 1) or the ferrite precipitation starting temperature (Ar 3), non-martensite structures such as proeutectoid ferrite, pearlite and the like are generated, and the structures are left until the quenching is finished, so that the toughness of the plate strip steel is obviously reduced, and the problems of stress concentration, uneven tissue distribution and the like are generated.
In order to avoid the non-martensitic structure in the heat treatment of the plate strip, the following three methods are generally used. (1) The moving speed of the plate strip steel is improved to shorten the transfer time: because the speed of the plate and strip steel out of the normalizing furnace is determined by the quenching process speed, and the quenching process speed is determined by multiple factors such as the critical cooling speed of the plate and strip steel, the capacity of a quenching device, the shape of a quenching plate and the like, the problems of unqualified shape of the quenching plate, large residual stress and the like can be generated by increasing the moving speed of the plate and strip steel, so the implementation of the method is difficult; (2) shorten normalizing furnace and guenching unit interval and then reduce the air cooling distance: a discharging furnace door, a temperature detection and plate strip steel tracking device, a quenching machine water retaining device, a purging device and the like are arranged in the distance, the space distance is very narrow, and the reduction of the distance can aggravate the roasting of the quenching device by the normalizing furnace, so the implementation of the method is difficult; (3) improving the temperature of the plate strip steel before quenching: by designing the temperature compensation device and developing the temperature compensation method, the plate strip steels with different thicknesses and steel grades are compensated to a certain temperature after being taken out of the normalizing furnace, the non-martensite phase transformation before quenching is prevented, and the method is not influenced by the process and the position of the device and has feasibility.
The invention aims to improve the temperature of the ultra-thin high-strength plate strip steel before quenching, shorten the air cooling time, prevent the occurrence of unfavorable structure transformation such as non-martensite phase transformation, coarse crystal grains, carbide precipitation and the like before quenching, improve the quenching shape, the performance uniformity and the toughness of the ultra-thin high-strength plate strip steel and improve the quenching quality by researching and developing a plate strip steel temperature compensation device and a temperature compensation method after a normalizing furnace and before a quenching device.
In the existing patent, chinese patent application (publication No. CN 212800440U) discloses a temperature compensation mechanism for heating the surface of a metal product requiring secondary quenching. The mechanism carries out temperature compensation aiming at metal parts, and temperature compensation objects, mechanism forms and realization functions are greatly different from those of the mechanism.
The Chinese patent application (publication number CN 106643135A) discloses a temperature compensation system for a rolling piece rolling process, which is used for compensating the temperature of rolling pieces and improving the temperature uniformity of the whole plate when long rolling pieces are produced in batches. The system is arranged near the rolling mill, and the realization function and the mechanism form are greatly different from the invention.
Chinese patent application (publication No. CN 112170506A) discloses a temperature compensation method and device for a magnesium alloy plate strip conveying roller way, wherein the temperature difference between the upper surface and the lower surface of a plate strip is adjusted through the conveying roller way, so that the uniform thickness-direction temperature distribution is realized. The implementation objects, the temperature supplementing mode and the temperature supplementing aim of the device and the method are greatly different from those of the invention.
Disclosure of Invention
The invention aims to provide a heat treatment temperature supplementing device and a temperature supplementing method for ultrathin high-strength strip steel, aiming at the technical bottleneck problems that the existing ultrathin high-strength strip steel is produced with non-martensite structure, large residual stress and poor structure uniformity in the quenching process due to rapid temperature drop and low quenching and cooling temperature after being taken out of a heat treatment furnace, so that the quenching heat treatment production with high flatness and low residual stress of the strip steel can be realized, and the heat treatment requirements of the strip steel on the structural performance, the toughness and the like are met.
The technical scheme of the invention is as follows:
a heat treatment temperature compensating device for ultrathin high-strength plate strip steel is arranged between a roller hearth type heat treatment furnace 6 and a roller type quenching machine 7 and mainly comprises a heat insulation shell 3, a transmission system 4 and a temperature compensating system 5;
the heat insulation shell 3 comprises a steel outer shell 8, a heat insulation layer 9, a high temperature resistant soft curtain 10 and a slag discharge connecting rod 11; the steel shell 8 is a cuboid and is positioned on the outer layer of the temperature compensating device 1, and a heat insulation layer 9 is laid on the inner side of the steel shell 8; of the four side surfaces of the steel shell 8, the side surface facing the roller-hearth heat treatment furnace 6 is provided with a feed inlet 12, and the side surface facing the roller quenching machine (7) is provided with a discharge outlet 13; the lower ends of the other two side surfaces are provided with supports 20, the heat insulation shell 3 is arranged on a roller way beam 21 of the roller quenching machine 7 through the supports 20, one side surface of the two side surfaces is provided with a roller way round hole 17, the other side surface is provided with a roller way round hole 17 and an electric heating belt round hole 18, and the electric heating belt round hole 18 is positioned above the roller way round hole 17; the top end of the steel shell 8 is provided with a thermocouple round hole 19 penetrating through the heat insulation layer 9; the bottom end of the steel shell 8 is provided with a detachable slag discharge cover 14; the end part of the slag discharging cover 14 is provided with a connecting shaft 15, the connecting shaft 15 is connected with one end of a slag discharging connecting rod 11, and the other end of the slag discharging connecting rod 11 is fixed on a fixing mechanism 16 at the bottom end of the steel shell 8 through another rotating shaft 15; a high-temperature-resistant soft curtain 10 is arranged on the outer side of the side wall of the steel shell 8 at the discharge port 13 side;
the transmission system 4 comprises a roller way 22, a transmission motor 23 and a rotary encoder 24; the roller way 22 penetrates through the steel shell 8 through a roller way round hole 17, two ends of the roller way 22 are arranged on a roller way beam 21 of the roller quenching machine 7, and one end of the roller way beam is sequentially connected with a transmission motor 23 and a rotary encoder 24; the rotary encoder 24 is connected with the control unit 27 for speed feedback; the control unit 27 is connected with the transmission motor 23 for speed control;
the temperature supplementing system 5 comprises an electric heating belt 25 and a thermocouple 26; the electric heating belt 25 is arranged at the inner side of the heat insulation layer 9 above the side where the feed inlet 12 and the discharge outlet 13 are positioned in a snake shape; one end of the thermocouple 26 is inserted into the steel shell 8 through the thermocouple round hole 19, and the other end is connected with the control unit 27 for temperature feedback; the end of the electric heating belt 25 is connected to a control unit 27 through the electric heating belt round hole 18, and the control unit 27 controls the temperature of the electric heating belt 25.
The feed inlet 12 and the discharge outlet 13 are horizontally and concentrically arranged; two circular holes 18 are arranged on the electric heating belt.
The steel shell 8 and the roller way 22 are both made of heat-resistant steel; the heat insulation layer 9 is made of ceramic fiber; the electric heating belt 25 is made of high-temperature iron, chromium and aluminum, and the heating temperature range is 700-980 ℃.
The wall thickness of the steel shell 8 is 5mm; the wall thickness of the heat insulation layer 9 is 80mm; the length of the feed inlet 12 and the discharge outlet 13 is 2200mm, and the height is 100mm; the length of the slag discharge cover 14 is 400mm, and the width thereof is 200mm; the diameter of the roller way round hole 17 is 150mm, and the center of the roller way round hole is 225mm away from the outer wall of the bottom of the steel shell 8; the diameter of the circular hole 18 of the electric heating belt is 34mm, and the center of the circular hole is 515mm away from the outer wall of the bottom of the steel shell 8; the diameter of the thermocouple round hole 19 is 12mm; the roller track 22 has a diameter of 146mm.
The power of the transmission motor 23 is 2.2kW; the linear speed range of the roller way 22 is 2 to 60m/min; after the strip steel 2 is heated, the strip steel is taken out of the roller hearth type heat treatment furnace 6 and is carried and transported to the roller type quenching machine 7 by the roller way 22.
A heat treatment temperature compensation method for ultrathin high-strength plate strip steel mainly comprises a temperature control method 28 and a speed control method 29; before the plate and strip steel 2 is heated and ready to be discharged out of the roller hearth type heat treatment furnace 6, the temperature of the temperature compensating device 1 is controlled by a temperature control method 28 to meet the cooling temperature before the plate and strip steel 2 is quenched, and the linear speed of a roller way is controlled by a speed control method 29 to meet the air cooling temperature drop requirement of the plate and strip steel 2; when the strip steel 2 is discharged from the roller hearth type heat treatment furnace 6 and enters the roller type quenching machine 7, the linear speed of the roller way of the roller hearth type heat treatment furnace 6, the linear speed of the roller way of the temperature compensating device 1 and the linear speed of the roller way of the roller type quenching machine 7 are consistent.
The temperature control method 28 specifically includes that the thermocouple 26 measures the temperature compensation temperature of the temperature compensation device 1 and feeds the temperature compensation temperature back to the control unit 27, and the control unit 27 controls the output current of the electric heating tape 25 in a PID closed-loop control mode, so as to control the temperature compensation temperature inside the temperature compensation device 1; when the thickness of the plate and strip steel is E [1,2] mm, the temperature compensation temperature = the tapping temperature of the plate and strip steel +20 ℃; the temperature compensation temperature = the tapping temperature of the plate and strip steel +15 ℃ when the thickness of the plate and strip steel is E (2, 3) ] mm, the temperature compensation temperature = the tapping temperature of the plate and strip steel +10 ℃ when the thickness of the plate and strip steel is E (3, 4) ] mm, and the temperature compensation temperature control precision is not more than 5 ℃.
The speed control method 29 specifically comprises the steps that the roller bed linear speed of the temperature compensating device 1 is measured and calculated by the rotary encoder 24 and fed back to the control unit 27, the control unit 27 controls the rotating speed of the transmission motor 23 in a PID closed-loop control mode, so that the roller bed linear speed is controlled, and the control precision of the roller bed linear speed is not more than 0.1m/min; the linear speed of the roller path of the plate strip steel 2 is calculated according to the following formula, wherein H is the thickness of the plate strip steel in mm, and V is the linear speed of the roller path in m/min;
the invention has the beneficial effects that:
the ultra-thin high-strength plate strip steel heat treatment temperature supplementing device and the temperature supplementing method effectively reduce the air cooling temperature drop of the plate strip steel after the plate strip steel is discharged from the roller hearth type heat treatment furnace, improve the quenching and cooling temperature of the plate strip steel, avoid unfavorable tissue transformation such as non-martensite phase transformation, coarse crystal grains, carbide precipitation and the like before the plate strip steel is quenched, improve the quenching plate shape, residual stress after quenching, performance uniformity and toughness of the ultra-thin high-strength plate strip steel, and improve the quenching quality. The implementation effect shows that the temperature compensation temperature before quenching of the plate strip steel is above 870 ℃, the temperature compensation and control precision is +/-5 ℃, and the continuous and stable heat treatment production of the extremely-thin high-strength plate strip steel is realized.
Drawings
FIG. 1 is a schematic diagram of a temperature compensation device and a temperature compensation method for heat treatment of ultra-thin high-strength plate strip steel in the invention;
FIG. 2 is a sectional view of the temperature compensating device for heat treatment of ultra-thin high-strength plate strip steel in the present invention;
FIG. 3 is a structural diagram of the heat insulation shell and the electric heating belt of the ultra-thin high-strength plate strip steel heat treatment temperature-compensating device in the invention.
In the figure, 1 a temperature compensation device; 2, plate band steel; 3, a heat insulation shell; 4, a transmission system; 5, a temperature supplementing system; 6 roller hearth heat treatment furnace; 7 a roll quenching machine; 8 steel shell; 9 a heat insulation layer; 10 high temperature resistant soft curtain; 11 a deslagging connecting rod; 12 feeding ports; 13, discharging a material outlet; 14, a slag discharge cover; 15 a rotating shaft; 16 a fixing mechanism; 17, roller bed circular holes; 18 circular holes of electric heating bands; 19 thermocouple circular holes; 20, a support; 21 roller bed beam; 22 roller bed; 23 driving the motor; 24 a rotary encoder; 25 electric heating bands; 26 a thermocouple; 27 a control unit; 28 temperature control method; 29 speed control method.
Detailed Description
The specific implementation of the temperature compensation device and the temperature compensation method for heat treatment of the ultra-thin high-strength plate strip steel is described by taking the continuous quenching of the high-strength plate strip steel with the thickness of 2mm and the width of 2000mm as an example and combining the attached drawings 1-3. The temperature compensating device 1 is arranged between the roller hearth type heat treatment furnace 6 and the roller type quenching machine 7 and is arranged on a roller way beam 21 of the roller type quenching machine 7 through a support 20, and a roller way round hole 17, an electric heating belt round hole 18 and a thermocouple round hole 19 are respectively designed on a heat insulation shell 3 of the temperature compensating device 1 and are used for installing a roller way 22, an electric heating belt 25 incoming and outgoing line and a thermocouple 26. Before the strip steel 2 is discharged from the roller hearth type heat treatment furnace 6, a control unit 27 of the temperature compensation device 1 is started, the target heating temperature of the temperature compensation device 1 is calculated to be 920 ℃ according to a temperature control method 28, and the linear velocity of a roller way is calculated to be 6.4m/min according to a velocity control method 29; the control unit 27 controls the electric heating tape 25 of the temperature compensation system 5 to pass through current in a PID control mode, so that the requirement of 920 +/-5 ℃ temperature in the temperature compensation device 1 is met, the temperature in the temperature compensation device 1 is fed back in real time through the thermocouple 26, and the temperature is controlled in a closed loop mode; the control unit 27 controls the rotating speed of the transmission motor 23 of the transmission system 4 in a PID control mode, meets the requirement of the linear speed of the roller way of 6.4 +/-0.1 m/min, feeds back the linear speed of the roller way in real time through the rotary encoder 24, and participates in speed closed-loop control; after the preparation, the strip steel 2 is taken out of the roller hearth type heat treatment furnace 6, enters a feed inlet 12 of the steel shell 8 and the heat-insulating layer 9 facing one side of the roller hearth type heat treatment furnace 6 at the speed of 6.4m/min, is subjected to temperature compensation heating by an electric heating belt 25, is carried and transported by the strip steel 2 in the temperature compensation device 1 by a roller way 22, is taken out of the temperature compensation device 1 from a discharge outlet 13 of the steel shell 8 and the heat-insulating layer 9 facing one side of the roller type quenching machine 7 at the speed of 6.4m/min, and is taken into the roller type quenching machine 7 by a high temperature resistant soft curtain 10 to complete quenching.
After the strip steel 2 of this embodiment completely exits the temperature compensation device 1, if the next strip steel has the same specification as the strip steel 2 of this embodiment, the control parameters of the temperature compensation device 1 are not changed, and if the specification of the next strip steel is changed, the target heating temperature and the roller linear speed are recalculated according to the temperature control method 28 and the speed control method 29, and the control unit 27 controls the electric heating belt 25 and the transmission motor 23 to respectively adjust the heating temperature and the roller linear speed of the temperature compensation device 1.
When a large amount of iron oxide scales of the plate strip steel 2 are accumulated in the temperature compensation device 1 after long-term production, the slag discharging cover 14 at the lower part of the temperature compensation device 1 is opened under the non-production state, the slag discharging cover 14 is connected to the fixing mechanism 16 through the rotating shaft 15 and the slag discharging connecting rod 11, and the slag discharging cover 14 is covered again after the iron oxide scales in the temperature compensation device 1 are removed.
Thus, the ultra-thin high-strength plate strip steel heat treatment temperature supplementing device and the temperature supplementing method are implemented.
The result of the process, compared with the process adopting the temperature supplementing device and the temperature supplementing method, is that the quenching start-cooling temperature of the plate strip steel is obviously improved, the non-martensite phase transformation is avoided, and the flatness of the quenched plate shape of the plate strip steel is obviously improved, as shown in the following table.
Claims (8)
1. A heat treatment temperature compensating device for ultrathin high-strength plate strip steel is characterized in that the temperature compensating device (1) is arranged between a roller hearth type heat treatment furnace (6) and a roller quenching machine (7) and mainly comprises a heat insulation shell (3), a transmission system (4) and a temperature compensating system (5);
the heat insulation shell (3) comprises a steel shell (8), a heat insulation layer (9), a high-temperature-resistant soft curtain (10) and a slag discharge connecting rod (11); the steel shell (8) is a cuboid and is positioned at the outer layer of the temperature compensating device (1), and a heat insulation layer (9) is laid on the inner side of the steel shell (8); in the four side surfaces of the steel shell (8), a feed inlet (12) is arranged on the side surface facing the roller-hearth heat treatment furnace (6), and a discharge outlet (13) is arranged on the side surface facing the roller-type quenching machine (7); the lower ends of the other two side surfaces are provided with supports (20), the heat insulation shell (3) is arranged on a roller way beam (21) of the roller quenching machine (7) through the supports (20), one of the two side surfaces is provided with a roller way round hole (17), the other side surface is provided with a roller way round hole (17) and an electric heating belt round hole (18), and the electric heating belt round hole (18) is positioned above the roller way round hole (17); the top end of the steel shell (8) is provided with a thermocouple round hole (19) penetrating through the heat insulation layer (9); the bottom end of the steel shell (8) is provided with a detachable slag discharging cover (14); a connecting shaft (15) is arranged at the end part of the slag discharging cover (14), the connecting shaft (15) is connected with one end of a slag discharging connecting rod (11), and the other end of the slag discharging connecting rod (11) is fixed on a fixing mechanism (16) at the bottom end of the steel shell (8) through another rotating shaft (15); a high-temperature resistant soft curtain (10) is arranged on the outer side of the side wall of the steel shell (8) at the discharge hole (13) side;
the transmission system (4) comprises a roller way (22), a transmission motor (23) and a rotary encoder (24); the roller way (22) penetrates through the steel shell (8) through a roller way round hole (17), two ends of the roller way (22) are arranged on a roller way beam (21) of the roller quenching machine (7), and one end of the roller way beam is sequentially connected with a transmission motor (23) and a rotary encoder (24); the rotary encoder (24) is connected with the control unit (27) for speed feedback; the control unit (27) is connected with the transmission motor (23) for speed control;
the temperature supplementing system (5) comprises an electric heating belt (25) and a thermocouple (26); the electric heating belt (25) is arranged at the inner side of the heat insulation layer (9) above the side where the feed inlet (12) and the discharge outlet (13) are located in a snake shape; one end of the thermocouple (26) is inserted into the steel shell (8) through the thermocouple round hole (19), and the other end of the thermocouple is connected with the control unit (27) for temperature feedback; the end part of the electric heating belt (25) is connected to a control unit (27) through an electric heating belt round hole (18), and the control unit (27) controls the temperature of the electric heating belt (25).
2. The extremely-thin high-strength plate strip steel heat treatment temperature supplementing device according to claim 1, wherein the feed inlet (12) and the discharge outlet (13) are horizontally concentrically arranged; two circular holes (18) of the electric heating belt are arranged.
3. The extremely thin high-strength plate strip steel heat treatment temperature supplementing device according to claim 1 or 2, wherein the steel shell (8) and the roller way (22) are both made of heat-resistant steel; the heat insulation layer (9) is made of ceramic fiber; the electric heating belt (25) is made of high-temperature iron-chromium-aluminum, and the heating temperature range is 700-980 ℃.
4. The extremely thin high-strength plate strip steel heat treatment temperature supplementing device according to claim 3, wherein the wall thickness of the steel shell (8) is 5mm; the wall thickness of the heat insulation layer (9) is 80mm; the length of the feed inlet (12) and the discharge outlet (13) is 2200mm, and the height of the feed inlet and the discharge outlet is 100mm; the length of the slag discharge cover (14) is 400mm, and the width of the slag discharge cover is 200mm; the diameter of the roller way round hole (17) is 150mm, and the center of the roller way round hole is 225mm away from the outer wall of the bottom of the steel shell (8); the diameter of the circular hole (18) of the electric heating belt is 34mm, and the center of the circular hole is 515mm away from the outer wall of the bottom of the steel shell (8); the diameter of the thermocouple round hole (19) is 12mm; the diameter of the roller way (22) is 146mm.
5. The ultra-thin high-strength plate strip steel heat treatment temperature supplementing device according to claim 3, wherein the power of the transmission motor (23) is 2.2kW; the linear speed range of the roller way (22) is 2-60 m/min; after the plate strip steel (2) is heated, the plate strip steel is taken out of the roller hearth type heat treatment furnace (6) and then is carried and transported to a roller type quenching machine (7) by a roller way (22).
6. A method for compensating temperature of ultra-thin high-strength plate strip steel by heat treatment is characterized in that the method for compensating temperature mainly comprises a temperature control method (28) and a speed control method (29); before the plate-strip steel (2) is heated and ready to be discharged out of the roller hearth type heat treatment furnace (6), the temperature of the temperature compensating device (1) is controlled by a temperature control method (28) to meet the cooling temperature before the plate-strip steel (2) is quenched, the linear speed of a roller way is controlled by a speed control method (29) to meet the air cooling temperature drop requirement of the plate-strip steel (2); when the plate strip steel (2) is taken out of the roller hearth type heat treatment furnace (6) and enters the roller type quenching machine (7), the roller way linear speed of the roller hearth type heat treatment furnace (6), the roller way linear speed of the temperature compensating device (1) and the roller way linear speed of the roller type quenching machine (7) are consistent.
7. The extremely-thin high-strength plate strip steel heat treatment temperature supplementing method according to claim 6, wherein the temperature control method (28) is specifically that the thermocouple (26) measures the temperature supplementing temperature of the temperature supplementing device (1) and feeds the temperature supplementing temperature back to the control unit (27), and the control unit (27) controls the output current of the electric heating belt (25) in a PID closed-loop control mode so as to control the temperature supplementing temperature inside the temperature supplementing device (1); when the thickness of the plate and strip steel is E [1,2] mm, the temperature compensation temperature = the tapping temperature of the plate and strip steel +20 ℃; the temperature compensation temperature = the tapping temperature of the plate and strip steel +15 ℃ when the thickness of the plate and strip steel is E (2, 3) ] mm, the temperature compensation temperature = the tapping temperature of the plate and strip steel +10 ℃ when the thickness of the plate and strip steel is E (3, 4) ] mm, and the temperature compensation temperature control precision is not more than 5 ℃.
8. The extremely-thin high-strength plate strip steel heat treatment temperature supplementing method according to claim 6, wherein the speed control method (29) is specifically that the roller way linear speed of the temperature supplementing device (1) is measured and calculated by a rotary encoder (24) and fed back to a control unit (27), the control unit (27) controls the rotating speed of a transmission motor (23) in a PID closed-loop control mode so as to control the roller way linear speed, and the control precision of the roller way linear speed is not more than 0.1m/min; the linear speed of the roller way of the plate strip steel (2) is calculated according to the following formula, wherein H is the thickness of the plate strip steel in unit mm, and V is the linear speed of the roller way in unit m/min;
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