CN117418098A - Ultrathin strip heat treatment method for preventing workpiece from bending and sagging - Google Patents
Ultrathin strip heat treatment method for preventing workpiece from bending and sagging Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 88
- 238000010438 heat treatment Methods 0.000 title claims abstract description 75
- 238000005452 bending Methods 0.000 title claims abstract description 22
- 238000007665 sagging Methods 0.000 title claims abstract description 22
- 238000000137 annealing Methods 0.000 claims abstract description 65
- 238000004804 winding Methods 0.000 claims description 53
- 229910000831 Steel Inorganic materials 0.000 claims description 43
- 239000010959 steel Substances 0.000 claims description 43
- 230000001360 synchronised effect Effects 0.000 claims description 23
- 238000005259 measurement Methods 0.000 claims description 6
- 230000014509 gene expression Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 description 16
- 239000002184 metal Substances 0.000 description 16
- 230000001276 controlling effect Effects 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 10
- 238000001816 cooling Methods 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 230000026676 system process Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- 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
- C21D1/26—Methods of annealing
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/68—Furnace coilers; Hot coilers
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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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- 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)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a heat treatment method of an ultrathin strip for preventing a workpiece from bending and sagging, which is characterized by comprising the following steps of: 1) An inner circulation conveyor belt is additionally arranged in the continuous heating annealing furnace, is positioned at the process section position of the continuous heating annealing furnace and runs synchronously with a main conveying structure in the continuous heating annealing furnace; 2) Placing an ultrathin strip workpiece on an inner circulating conveyor belt, and enabling the ultrathin strip workpiece to run along with the inner circulating conveyor belt, so that the ultrathin strip workpiece passes through a continuous annealing furnace process section under a tension-free or micro-tension state; 3) The ultrathin strip workpiece is protected from being in a flat and intact state when passing through the continuous annealing furnace process section by utilizing the process section of the continuous annealing furnace under the state of no tension or micro tension, and the ultrathin strip workpiece is prevented from bending and sagging, so that the ultrathin strip heat treatment is completed. Has outstanding substantive characteristics and remarkable technical progress of preventing the workpiece from bending and sagging, preventing the surface of the workpiece from wearing and the like.
Description
Technical Field
The invention relates to a heat treatment method for an ultrathin strip for preventing a workpiece from bending and sagging, which is suitable for continuous bright annealing heat treatment of an ultrathin metal strip. Belongs to the technical field of manufacturing mechanical equipment for heat treatment.
Background
The ultrathin metal strip generally refers to a metal strip with the thickness less than or equal to 0.3mm, and the product can be used in industries such as aerospace heat insulation layers, electronic precision elements, automobile three-way catalysis, lithium battery electrodes and the like and has wide market application. The ultrathin metal belt has the characteristics of high technical requirements, high added value and the like.
The working principle of the steel strip heat treatment method in the prior art is as follows: the tension formed by the winding mechanism and the unwinding mechanism is utilized to drive the steel belt to pass through the process section of the furnace body so as to realize continuous heating annealing, namely, the steel belt passes through the winding and unwinding mechanism and the tension mechanism to form the tension of the steel belt, so that the steel belt passes through the middle of the furnace in a suspending way, and the annealing process is realized. This requires that a high tension is provided to allow the steel strip (workpiece) to pass smoothly through the annealing furnace process section, if the tension is insufficient, the steel strip (workpiece) will sag to cause damage to the steel strip (workpiece), if the tension is sufficient and the thickness of the steel strip is insufficient, the steel strip (workpiece) will be broken, especially if the thickness of the steel strip is insufficient, the steel strip is easy to bend and even be broken when heated under tension, so that the method of heat treatment by using a continuous annealing furnace in the prior art is only suitable for steel strips with a thickness of more than 1 mm.
For example: chinese patent publication discloses: the invention relates to a method for improving intergranular corrosion of an aluminum alloy sheet, and the application number is 2021116558319, and the method is a method for improving intergranular corrosion of a 5083H116 sheet, and mainly adopts an air cushion type continuous heat treatment furnace to carry out heat treatment on an aluminum alloy strip. The method mainly aims at the problem of unqualified intergranular corrosion in the stabilizing treatment process of the box-type furnace, although the air cushion type continuous heat treatment furnace is adopted to realize continuous heat treatment of the strip, the strip is heated and cooled uniformly in the furnace through rapid temperature rise and fall in the whole stabilizing heat treatment process, the suspension of the strip is realized through the air cushion pressure, and finally, the 5083H116 qualified product with good performances is prepared and obtained, so that the problems of unstable intergranular corrosion, poor surface quality, low production efficiency and high comprehensive cost are solved; however, the speed difference between the traction assembly and the feeding assembly is regulated by the tension regulating assembly, so that the invention is only suitable for steel belts with the thickness of more than 1mm and is not suitable for metal belts with the thickness of less than or equal to 0.3 mm. The invention is named as a method and equipment for controlling deformation of sheet stock by continuous heat treatment, and the application number is 2006101246979, wherein the sheet stock is heated at high temperature and then conveyed to a sheet stock continuous heat treatment deformation controlling equipment in a cooling tank by a conveying equipment, and quenching is completed and sheet stock deformation is controlled under the clamping transmission of the sheet stock continuous heat treatment deformation controlling equipment. The continuous sheet heat treatment deformation controlling equipment comprises a frame, wherein an upper chain transmission device and a lower chain transmission device are arranged on the frame, and a contact surface is arranged between a chain of the upper chain transmission device and a chain of the lower chain transmission device to form a transmission control deformation surface for clamping and restraining the sheet. The method is also only suitable for steel belts with the thickness of more than 1mm, and is not suitable for metal belts with the thickness of less than or equal to 0.3 mm.
For the metal belt (steel belt) with the thickness less than or equal to 0.3mm, because the ultra-thin metal belt has low strength, the ultra-thin metal belt is very easy to break when heated under the tension condition of the prior art, so tension cannot be established on a workpiece, and the workpiece sags at the bottom of a furnace when heated under the tension condition, so that the surface of the product is worn and disqualified. Therefore, the prior art is used for continuously heating and annealing a metal strip (steel strip) with the thickness less than or equal to 0.3mm by using a heat treatment method of a continuous annealing furnace, and the following problems exist: (1) Is easy to bend and even break when heated under tension. (2) When heated in the absence of tension, sags to the bottom of the furnace, causing product surface wear and failure.
Disclosure of Invention
The invention aims to solve the problems that a workpiece is easy to bend or sag at the bottom of a furnace and the surface of a product is worn out when a metal belt (steel belt) with the thickness less than or equal to 0.3mm is continuously heated and annealed by using a heat treatment method of a continuous annealing furnace in the prior art, and provides an ultrathin strip heat treatment method for preventing the workpiece from bending, breaking and sagging. Has outstanding substantive characteristics and remarkable technical progress of preventing the workpiece from bending and sagging, preventing the surface of the workpiece from wearing and the like.
The aim of the invention can be achieved by adopting the following technical scheme:
the heat treatment method for the ultrathin strip for preventing the workpiece from bending and sagging is characterized by comprising the following steps of:
1) An inner circulation conveyor belt is additionally arranged in the continuous heating annealing furnace, is positioned at the process section position of the continuous heating annealing furnace and runs synchronously with a main conveying structure in the continuous heating annealing furnace;
2) Placing an ultrathin strip workpiece on an inner circulating conveyor belt, and enabling the ultrathin strip workpiece to run along with the inner circulating conveyor belt, so that the ultrathin strip workpiece passes through a continuous annealing furnace process section under a tension-free or micro-tension state;
3) The ultrathin strip workpiece is protected from being in a flat and intact state when passing through the continuous annealing furnace process section by utilizing the process section of the continuous annealing furnace under the state of no tension or micro tension, and the ultrathin strip workpiece is prevented from bending and sagging, so that the ultrathin strip heat treatment is completed.
The invention is suitable for metal strips of stainless steel, copper, aluminum, nickel and the like, and the specification of the metal strips is 0.008-0.015mm in thickness and 150-280mm in width.
The aim of the invention can also be achieved by adopting the following technical scheme:
further, the inner circulating conveyor belt is directly arranged on the circulating conveyor belt of the main conveying structure and is in close contact with the circulating conveyor belt of the main conveying belt structure, so that the inner circulating conveyor belt moves in a circulating manner along with the main conveying structure in a process section of the continuous annealing furnace synchronously, and a synchronous conveying workpiece structure is formed.
Further, the internal circulation conveyor belt is connected with an independent driving mechanism, and the driving mechanism is synchronous with the main conveying structure to drive the internal circulation conveyor belt to run synchronously with the main conveying structure, so that the internal circulation conveyor belt moves synchronously in the process section of the continuous annealing furnace along with the main conveying structure in a circulating way, and a synchronous workpiece conveying structure is formed.
Further, in order to realize synchronous operation of the internal circulation conveyor belt and the main conveyor structure, the main conveyor structure or the main conveyor structure and the independent driving mechanism are controlled by a servo motor control structure, so that the operation speed V of the circulation conveyor belt is controlled Inner part Rotational linear velocity V with tension roller in continuous heating annealing furnace Sheet of paper And keep the same.
Further, in the running process of the continuous heating annealing furnace, the workpiece is conveyed from the unreeling mechanism to the reeling mechanism, so that the reeling diameter of the unreeling mechanism is continuously reduced, the reeling diameter of the reeling mechanism is continuously increased, the tension of the circulating conveying steel belt of the main conveying structure is controlled to be constant, the moment of the reeling mechanism is continuously changed, and the output moment of the driving motor is controlled in the process to keep the tension of the circulating conveying steel belt of the main conveying structure constant, so that synchronous control is realized.
Further, synchronous control is realized through the roll diameter measurement and tension control of the rolling mechanism, and the specific method is as follows:
1) Winding roller of servo motor output power driving winding mechanism, and rotating speed N of winding roller Collecting and recovering And moment M Collecting and recovering The sensor is fed back to a control mechanism for controlling the servo motor, and a sensor is also arranged in the tension roller of the winding mechanism to measure the rotation speed N of the tension roller Sheet of paper And measuring tension F of tension roller Sheet of paper ；
2) Linear velocity V of the tension roller Sheet of paper Tension roller speed N =pi × Sheet of paper * Diameter D of tension roller Sheet of paper The linear velocity V of the wind-up roller Collecting and recovering Wind-up roll speed N =pi × Collecting and recovering * Wind-up roll diameter D Collecting and recovering ；
3) The speed of the circulating conveying steel belt passing through each wind-up roller and the tension roller of the main conveying structure is uniformThus, measured in real time: belt speed V of endless conveyor belt of main conveyor structure Band = V Tension = V Collecting and recovering *N Sheet of paper *D Sheet of paper ＝N Collecting and recovering *D Collecting and recovering Winding diameter D of winding mechanism Collecting and recovering ＝N Sheet of paper *D Sheet of paper /N Collecting and recovering Winding moment M Collecting and recovering ＝F Sheet of paper *D Collecting and recovering /2＝F Sheet of paper *N Sheet of paper *D Sheet of paper /N Collecting and recovering /2；
4) And (3) measuring relevant parameters and expressions of the wind-up roller and the tension roller by the method in the 1) to the 3), obtaining tension control quantity and winding diameter size variation quantity, realizing constant tension control, obtaining the belt speed of the circulating conveying steel belt, further obtaining the belt speed of the inner circulating conveying belt, and realizing synchronous control.
The measuring and controlling method of the unreeling mechanism is the same as that of the reeling mechanism.
Further, the control method for tension constant is as follows: speed V of endless conveyor belt of main conveyor structure Belt with a belt body (M/S), line speed V of tension roller Sheet of paper (M/S), rotational speed N of tension roller Sheet of paper (R/S), diameter D of tension roller Sheet of paper (M) tension of tension roller F Sheet of paper (N) winding moment M Collecting and recovering (NM), winding speed V Collecting and recovering (M/S) rotational speed N of wind-up roll Collecting and recovering (M/S), diameter of winding (winding diameter) D Collecting and recovering (M)＝N Sheet of paper *D Sheet of paper /N Collecting and recovering 。
The invention has the following outstanding substantive features and remarkable progress:
1. in the invention, the internal circulation conveyor belt is additionally arranged in the continuous heating annealing furnace, and is positioned at the process section position of the continuous heating annealing furnace and synchronously operates with the main conveying structure in the continuous heating annealing furnace; placing an ultrathin strip workpiece on an inner circulating conveyor belt, and enabling the ultrathin strip workpiece to run along with the inner circulating conveyor belt, so that the ultrathin strip workpiece passes through a continuous annealing furnace process section under a tension-free or micro-tension state; the ultrathin strip workpiece is protected from being in a flat and intact state when passing through the continuous annealing furnace process section by utilizing the process section of the continuous annealing furnace under the state of no tension or micro tension, and the ultrathin strip workpiece is prevented from bending and sagging, so that the ultrathin strip heat treatment is completed. Therefore, the problems that the workpiece is easy to bend or sag at the bottom of the furnace and the surface of the product is worn in the prior art can be solved, and the method has the outstanding substantive characteristics and obvious technical progress of preventing the workpiece from bending and sagging, preventing the surface of the workpiece from being worn and the like.
2. The invention realizes synchronous control through the rolling diameter measurement and tension control of the rolling mechanism, thus having the outstanding substantive characteristics and obvious technical progress of simple and accurate control method, preventing the workpiece from bending and being broken, preventing the workpiece from sagging at the bottom of the furnace, preventing the surface of the workpiece from wearing, preventing the surface of the workpiece from generating roll marks and indentations, having no noise, saving energy sources and the like.
3. The invention can correct the deviation of the workpiece (thin belt) before entering the winding tension control unit, ensures accurate winding tension control and tidier and stronger workpiece (thin belt) after winding, and has the characteristics of accurate product winding control, good product winding quality, high efficiency and the like.
Detailed Description
Specific example 1:
the heat treatment method for the ultrathin strip for preventing the workpiece from bending and sagging is characterized by comprising the following steps of:
1) An inner circulation conveyor belt is additionally arranged in the continuous heating annealing furnace, is positioned at the process section position of the continuous heating annealing furnace and runs synchronously with a main conveying structure in the continuous heating annealing furnace;
2) Placing an ultrathin strip workpiece on an inner circulating conveyor belt, and enabling the ultrathin strip workpiece to run along with the inner circulating conveyor belt, so that the ultrathin strip workpiece passes through a continuous annealing furnace process section under a tension-free or micro-tension state;
3) The ultrathin strip workpiece is protected from being in a flat and intact state when passing through the continuous annealing furnace process section by utilizing the process section of the continuous annealing furnace under the state of no tension or micro tension, and the ultrathin strip workpiece is prevented from bending and sagging, so that the ultrathin strip heat treatment is completed.
The embodiment is suitable for metal strips of stainless steel, copper, aluminum, nickel and the like, and the specification of the metal strips is 0.008-0.015mm in thickness and 150-280mm in width.
In this embodiment:
further, the inner circulating conveyor belt is directly arranged on the circulating conveyor belt of the main conveying structure and is in close contact with the circulating conveyor belt of the main conveying belt structure, so that the inner circulating conveyor belt moves in a circulating manner along with the main conveying structure in a process section of the continuous annealing furnace synchronously, and a synchronous conveying workpiece structure is formed.
Further, the internal circulation conveyor belt is connected with an independent driving mechanism, and the driving mechanism is synchronous with the main conveying structure to drive the internal circulation conveyor belt to run synchronously with the main conveying structure, so that the internal circulation conveyor belt moves synchronously in the process section of the continuous annealing furnace along with the main conveying structure in a circulating way, and a synchronous workpiece conveying structure is formed.
Further, in order to realize synchronous operation of the internal circulation conveyor belt and the main conveying structure, the main conveying structure or the main conveying structure and the independent driving mechanism are controlled by a servo motor control structure, so that the operation speed V of the circulation conveyor belt is consistent with the rotation linear speed V of the tension roller in the continuous heating annealing furnace.
Further, in the running process of the continuous heating annealing furnace, the workpiece is conveyed from the unreeling mechanism to the reeling mechanism, so that the reeling diameter of the unreeling mechanism is continuously reduced, the reeling diameter of the reeling mechanism is continuously increased, the tension of the circulating conveying steel belt of the main conveying structure is controlled to be constant, the moment of the reeling mechanism is continuously changed, and the output moment of the driving motor is controlled in the process to keep the tension of the circulating conveying steel belt of the main conveying structure constant, so that synchronous control is realized.
Further, synchronous control is realized through the roll diameter measurement and tension control of the rolling mechanism, and the specific method is as follows:
1) Winding roller of servo motor output power driving winding mechanism, and rotating speed N of winding roller Collecting and recovering And moment M Collecting and recovering The sensor is fed back to a control mechanism for controlling the servo motor, and a sensor is also arranged in the tension roller of the winding mechanism to measure the rotation speed N of the tension roller Sheet of paper And measuring tension F of tension roller Sheet of paper ；
2) Linear velocity V of the tension roller Sheet of paper Tension roller speed N =pi × Sheet of paper * Diameter D of tension roller Sheet of paper The linear velocity V of the wind-up roller Collecting and recovering Wind-up roll speed N =pi × Collecting and recovering * Wind-up roll diameter D Collecting and recovering ；
3) The speed of the circulating conveying steel belt of the main conveying structure passing through each wind-up roller and tension roller is uniform, so that the real-time measurement is carried out: belt speed V of endless conveyor belt of main conveyor structure Belt with a belt body ＝V Sheet of paper ＝V Collecting and recovering *N Sheet of paper *D Sheet of paper ＝N Collecting and recovering *D Collecting and recovering Winding diameter D of winding mechanism Collecting and recovering ＝N Sheet of paper *D Sheet of paper /N Collecting and recovering Winding moment M Collecting and recovering ＝F Sheet of paper *D Collecting and recovering /2＝F Sheet of paper *N Sheet of paper *D Sheet of paper /N Collecting and recovering /2；
4) And (3) measuring relevant parameters and expressions of the wind-up roller and the tension roller by the method in the 1) to the 3), obtaining tension control quantity and winding diameter size variation quantity, realizing constant tension control, obtaining the belt speed of the circulating conveying steel belt, further obtaining the belt speed of the internal circulating conveying belt, and realizing synchronous control.
The measuring and controlling method of the unreeling mechanism is the same as that of the reeling mechanism.
Further, the control method for tension constant is as follows: speed V of endless conveyor belt of main conveyor structure Belt with a belt body (M/S), line speed V of tension roller Sheet of paper (M/S), rotational speed N of tension roller Sheet of paper (R/S), diameter D of tension roller Sheet of paper (M) tension of tension roller F Sheet of paper (N) winding moment M Collecting and recovering (NM), winding speed V Collecting and recovering (M/S) rotational speed N of wind-up roll Collecting and recovering (M/S), diameter of winding (winding diameter) D Collecting and recovering (M)＝N Sheet of paper *D Sheet of paper /N Collecting and recovering 。
The product strip is stored in a roll shape, and the strip winding and unwinding mechanism formed by an unreeling unit, an unreeling tension control unit and a winding tension control unit is used for completing an annealing heat treatment process through the furnace body heating system and the cooling system.
According to the embodiment, when the ultrathin strip passes through the continuous heating annealing furnace, the transmission mechanism drives the inner circulation conveying steel strip to synchronously pass through the heating system and the cooling system and continuously circulate, so that the inner circulation conveying steel strip is supported and synchronously passes through the process section of the continuous heating annealing furnace with a workpiece to form a micro-tension workpiece conveying and supporting structure, the ultrathin strip synchronously runs on the inner circulation conveying steel strip, the problem that the steel strip cannot establish large tension is solved, and the annealing quality of the ultrathin strip is ensured. Solves the technical problem of continuous bright annealing heat treatment of the ultrathin metal strip.
The working principle of the present embodiment in practical application is described in detail below:
the unreeling mechanism conveys the ultrathin strip (workpiece) to a feed port of the continuous heating annealing furnace, then synchronously conveys the ultrathin strip (workpiece) into the continuous heating annealing furnace through an internal circulation conveying steel belt, synchronously conveys the ultrathin strip (workpiece) into a heating system in a process section of the continuous heating annealing furnace, heats the ultrathin strip (workpiece) and then cools the ultrathin strip (workpiece) through a cooling system, and synchronously conveys the ultrathin strip (workpiece) to a discharge port through the internal circulation conveying steel belt, so that a heat treatment process of the ultrathin strip (workpiece) is completed; the heat-treated workpiece section enters a winding mechanism at the outlet end of the continuous heating annealing furnace, and the winding mechanism synchronously winds the workpiece into coiled materials; the internal circulation conveying steel belt is in the continuous operation process, so that workpieces are continuously and synchronously conveyed into the process section through the internal circulation conveying steel belt for heat treatment; thereby completing the heat treatment process of the ultrathin strip (workpiece). In the whole heat treatment process, the control system completes the following control process:
1) Main drive control
Setting the running speeds of an annealing furnace unit (comprising a feeding mechanism, a heating system, a cooling system and a discharging mechanism), a workpiece (strip) winding unit and a workpiece (strip) unwinding unit, and controlling the running speeds of the annealing furnace unit, the workpiece (strip) winding unit and the workpiece (strip) unwinding unit to be constant; the uncoiling tension of the uncoiling unit, the coiling tension of the coiling unit and the tension of the transmission mechanism in the process section are controlled to be constant, and the micro tension of the internal circulation transmission steel belt is controlled to be constant by controlling the tension of the transmission mechanism in the process section to be constant; and measuring the winding diameter of the work piece for unreeling and reeling and calculating the winding diameter through sensors arranged in the unreeling mechanism and the reeling mechanism.
2) Production process control
In the heat treatment process, the annealing furnace unit (comprising a feeding mechanism, a heating system, a cooling system and a discharging mechanism), the winding mechanism and the unreeling mechanism are controlled to be interlocked, inching and linkage according to the conventional heat treatment flow, and the running speed of the annealing furnace unit (comprising the feeding mechanism, the heating system, the cooling system and the discharging mechanism), the winding mechanism, the unreeling mechanism and the micro-tension of the steel belt are controlled to be controlled.
3) Auxiliary system process control
The whole heat treatment process is monitored, and the system has real-time display and automatic interlocking functions such as system faults and alarming, so as to meet the safety requirements of various functions and electrical systems and mechanical equipment required by the conventional heat treatment process work of an annealing furnace unit (comprising a feeding mechanism, a heating system, a cooling system and a discharging mechanism), a winding mechanism and an unwinding mechanism. In order to meet the requirements of each unit operation and the safety of the electrical system and mechanical equipment, all auxiliary systems have an automatic linkage function. The system fault, alarm and other real display are also provided.
4) Controlling the synchronous constant of the running speed of the internal circulation conveying steel belt and the workpiece
The speed control of the internal circulation conveying steel belt is extremely important in the whole unit control, and whether the internal circulation conveying steel belt is stable or not can directly influence the product quality. The speed control mainly includes: speed stabilizing control, acceleration and deceleration control and tension control.
In the operation process of the embodiment, the workpiece (ultrathin belt) is conveyed from unreeling to reeling, the reeling diameter of the unreeling is continuously reduced, the reeling diameter of the reeling is continuously increased, when the tension (pull force) of the workpiece (ultrathin belt) is constant, the moment of the reeling roller is also continuously changed, and the output moment of the motor is required to be continuously controlled in the process to keep the tension constant. The auxiliary system process control unit monitors the whole heat treatment flow, has real display and automatic interlocking functions of system faults, alarms and the like, and meets the safety requirements of an annealing furnace unit, a workpiece (strip) winding unit, a workpiece (strip) unreeling unit and electric systems and mechanical equipment.
Claims (6)
1. The heat treatment method for the ultrathin strip for preventing the workpiece from bending and sagging is characterized by comprising the following steps of:
1) An inner circulation conveyor belt is additionally arranged in the continuous heating annealing furnace, is positioned at the process section position of the continuous heating annealing furnace and runs synchronously with a main conveying structure in the continuous heating annealing furnace;
2) Placing an ultrathin strip workpiece on an inner circulating conveyor belt, and enabling the ultrathin strip workpiece to run along with the inner circulating conveyor belt, so that the ultrathin strip workpiece passes through a continuous annealing furnace process section under a tension-free or micro-tension state;
3) The ultrathin strip workpiece is protected from being in a flat and intact state when passing through the continuous annealing furnace process section by utilizing the process section of the continuous annealing furnace under the state of no tension or micro tension, and the ultrathin strip workpiece is prevented from bending and sagging, so that the ultrathin strip heat treatment is completed.
2. The method for heat treating an ultrathin strip to prevent bending and sagging of a workpiece according to claim 1, wherein: the inner circulation conveyor belt is directly arranged on the circulation conveyor belt of the main conveyor structure and is in close contact with the circulation conveyor belt of the main conveyor belt structure, so that the inner circulation conveyor belt moves in a circulating manner along with the main conveyor structure in a process section of the continuous annealing furnace synchronously, and a synchronous conveying workpiece structure is formed.
3. The method for heat treating an ultrathin strip to prevent bending and sagging of a workpiece according to claim 1, wherein: the internal circulation conveyor belt is connected with an independent driving mechanism, and the driving mechanism is synchronous with the main conveying structure to drive the internal circulation conveyor belt to run synchronously with the main conveying structure, so that the internal circulation conveyor belt moves synchronously along with the main conveying structure in a circulating manner in a process section of the continuous annealing furnace to form a synchronous conveying workpiece structure.
4. A method of heat treating an ultrathin strip to prevent bending and sagging of a workpiece according to claim 2 or 3, wherein: in order to realize synchronous operation of the internal circulation conveyor belt and the main conveying structure, the main conveying structure or the main conveying structure and the independent driving mechanism are controlled by a servo motor control structure, so that the operation speed V of the circulation conveyor belt Inner part Rotational linear velocity V with tension roller in continuous heating annealing furnace Sheet of paper And keep the same.
5. The method for heat treating an ultrathin strip for preventing bending and sagging of a workpiece according to claim 4, wherein: in the running process of the continuous heating annealing furnace, the workpiece is conveyed from the unreeling mechanism to the reeling mechanism, so that the reeling diameter of the unreeling mechanism is continuously reduced, the reeling diameter of the reeling mechanism is continuously increased, the tension of the circulating conveying steel belt of the main conveying structure is controlled to be constant, the moment of the reeling mechanism is continuously changed, and the output moment of the driving motor is controlled in the process to keep the tension of the circulating conveying steel belt of the main conveying structure constant, so that synchronous control is realized.
6. The method for heat treating an ultrathin strip for preventing bending and sagging of a workpiece according to claim 4, wherein: synchronous control is realized through the measurement of the winding diameter and the tension control of the winding mechanism, and the specific method is as follows:
1) Winding roller of servo motor output power driving winding mechanism, and rotating speed N of winding roller Collecting and recovering And moment M Collecting and recovering The sensor is fed back to a control mechanism for controlling the servo motor, and a sensor is also arranged in the tension roller of the winding mechanism to measure the rotation speed N of the tension roller Sheet of paper And measuring tension F of tension roller Sheet of paper ；
2) Linear velocity V of the tension roller Sheet of paper Tension roller rotation =pi ×Speed N Sheet of paper * Diameter D of tension roller Sheet of paper The linear velocity V of the wind-up roller Collecting and recovering Wind-up roll speed N =pi × Collecting and recovering * Wind-up roll diameter D Collecting and recovering ；
3) The speed of the circulating conveying steel belt of the main conveying structure passing through each wind-up roller and tension roller is uniform, so that the real-time measurement is carried out: belt speed V of endless conveyor belt of main conveyor structure Band = V Tension = V Collecting and recovering *N Sheet of paper *D Sheet of paper ＝N Collecting and recovering *D Collecting and recovering Winding diameter D of winding mechanism Collecting and recovering ＝N Sheet of paper *D Sheet of paper /N Collecting and recovering Winding moment M Collecting and recovering ＝F Sheet of paper *D Collecting and recovering /2＝F Sheet of paper *N Sheet of paper *D Sheet of paper /N Collecting and recovering /2；
4) And (3) measuring relevant parameters and expressions of the wind-up roller and the tension roller by the method in the 1) to the 3), obtaining tension control quantity and winding diameter size variation quantity, realizing constant tension control, obtaining the belt speed of the circulating conveying steel belt, further obtaining the belt speed of the inner circulating conveying belt, and realizing synchronous control.
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| CN202311339504.1A CN117418098A (en) | 2023-10-17 | 2023-10-17 | Ultrathin strip heat treatment method for preventing workpiece from bending and sagging |
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