An intelligent continuous casting device and method for precipitation-strengthened alloy plate and strip

Abstract

The present invention discloses an intelligent continuous casting device and method for precipitation-strengthening alloy plates and strips. The initial information of the strengthening alloy plates and strips is first input into a PC system, and the metal raw materials are placed in the core melting cavity of the smelting system for smelting, and electromagnetic stirring is performed. After the heat preservation is completed, the melt is flowed into the hot-cold composite zone of the molding system through a guide pipe to obtain a solid-liquid mixture. In the hot-cold composite zone, the PC system controls the edge temperature of the solid-liquid mixture in the molding system to be not lower than the core temperature, and then the solid-liquid mixture flowing out of the hot-cold composite zone contacts with the ingot copper plate to solidify, and is pulled into the rapid solid solution zone of the molding system with the copper plate, and is subjected to electric pulse treatment or induction heating treatment in the rapid solid solution zone, and then pulled out of the molding system, and then quenched to obtain the strengthening alloy plates and strips. The present invention can realize automation throughout the process and improve the molding efficiency and quality of the material.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material forming, and in particular relates to an intelligent continuous casting device and method for precipitation-strengthened alloy plate and strip. Background Art

[0002] With the development of 5G communication technology, more and more industries are inseparable from the path of big data and intelligent manufacturing. However, the development of the industry is inseparable from materials. Industries such as industry, agriculture, military industry, semiconductors, metallurgy, aerospace, etc. are closely related to alloy materials. These industries have certain requirements for the hardness, strength, and plastic toughness of materials. However, there is an exclusive relationship between the hardness, strength and plastic toughness of materials. In the process of pursuing high-strength and high-hardness materials, the cracking of materials due to plastic toughness has become an important link restricting the development of the industry.

[0003] The slabs and strips produced by the traditional horizontal continuous casting process have surface defects such as orange peel, segregation nodules, and cracks. The surface of the slabs and strips must be milled before subsequent processing, which has a great impact on the yield rate. On the other hand, the microstructure of the slabs and strips is mainly composed of well-developed columnar crystals along the thickness direction, and there are many internal defects such as pores, looseness, and slag inclusions, and the density is low, which leads to difficulties in subsequent cold processing, low yield rate and poor product quality.

[0004] At present, the production method of precipitation-strengthened alloy strips at home and abroad generally adopts the "semi-continuous ingot casting-hot rolling-milling-cold rolling-solid solution-cold rolling-aging" process. The main process flow of this production method is as follows: large-sized alloy ingots are produced by vertical semi-continuous ingot casting, and then the alloy ingots are sent to a large-scale step-type high-temperature annealing furnace for heating, and then taken out of the furnace for hot rolling. The hot-rolled ingot is double-sided milling to remove surface defects, and then rough rolling is carried out; according to the different sizes and specifications of the strip products, at least 1-2 intermediate annealing and pickling processes are required during the rolling process, and the strip after rough rolling is successively subjected to solid solution / quenching, cold rolling and aging treatment. However, this process has a series of problems in the actual production process:

[0005] (1) During the semi-continuous casting process, some alloy elements are volatile and slag is serious, which makes it difficult to control the composition of the ingot, and there are many defects such as internal slag inclusions and pores, low density, and poor ingot quality;

[0006] (2) During the production process, large-sized ingots need to be reheated to a higher temperature for hot rolling, which requires large heating and hot rolling equipment, resulting in large production investment and high energy consumption;

[0007] (3) The strip after hot rolling needs to be milled, which increases the process and reduces the yield rate;

[0008] (4) Due to the poor quality of the ingot and the narrow temperature range suitable for hot working, problems such as strip cracking, surface peeling, large residual stress, poor dimensional accuracy, and difficulty in process control are prone to occur during hot rolling and cold rolling, resulting in poor product quality and low coil weight;

[0009] (5) The work hardening rate is high, and the number of processing passes, intermediate annealing and pickling is large, resulting in a long process flow, a large environmental load, and high production costs.

[0010] Under the requirements of the industry, not only higher requirements are placed on the organization and performance of metal sheets and strips, but more importantly, higher requirements are placed on metal sheet and strip processing equipment.

[0011] As a new process that can improve the structure and performance of materials quickly and effectively, the current main work focuses on high-energy electric pulse treatment of solid metals, which can control the microstructure and performance of materials;

[0012] Its working principle is to apply high-energy pulse current on both sides of the metal material, that is, the pulse power supply inputs the pulse current into the powered area of ​​the metal material moving between the two electrodes through two electrodes, and the pulse current produces a coupling effect of Joule heating effect and non-thermal effect in the powered area of ​​the metal material. The pulse current significantly promotes the atomic diffusion in the material and the strong interaction with defects (vacancies, dislocations, grain boundaries), and can improve the material's organizational structure by quickly inducing recovery, recrystallization, phase change and other behaviors, control the solidification organization of the metal material, refine the grains, improve the diffusion capacity of the elements, and promote the uniform distribution of the hard phase in the metal material; at the same time, because the high-energy electric pulse is transmitted by the pulse current between the two electrodes, it can only regulate the mechanical properties and processing properties of the material in the target area.

[0013] At present, there are many methods for metal sheet processing, but there are few related studies on combining the metal casting process with sheet forming. The patent application document with patent number CN1972764B discloses a non-continuous metal strip and sheet manufacturing process and equipment between continuous casting and rolling. The process is to first obtain a 30-300mm thick blank by casting, then heat it in an induction furnace, and then directly transport it to the rolling mill for rolling in a non-continuous manner. This process separates the casting process from the forming process, and the problem of poor surface quality is handled by processes such as intermediate milling, and the process is cumbersome; at the same time, a large amount of manpower is required to transport the ingot, and the degree of intelligence is low and the cost is high. The patent application document with patent number CN101966564A discloses a white copper pipe hot and cold combined casting mold horizontal continuous casting equipment and its process. The process combines the casting equipment with the forming equipment, uses the horizontal continuous casting equipment to obtain the metal solution, and uses the graphite mold and connecting rod to directly pull the pipe from the metal solution. The patent application document with patent number CN107716885B discloses a short-process production method for high-strength and high-conductivity copper alloy strips, which uses hot-cold combined casting horizontal continuous casting to prepare copper alloy slabs, and then cold rolling-solid solution-cold rolling-aging to produce high-strength and high-conductivity copper alloy strips. These processes require high melting temperatures during the smelting process, which leads to coarse grains. At the same time, the metal solution is poured into the insulation device by pouring, which has a low safety factor. During the plate and strip forming process, the temperature of the edge of the material is higher than that of the core, forming a meniscus-shaped temperature distribution from the liquid phase to the solid phase, which leads to uneven structure of the plate and strip, cracks, orange peel and other defects, which seriously affect the material performance and surface quality.

[0014] In order to solve the problems existing in the prior art, the present invention provides an intelligent continuous casting device and method for precipitation-strengthened alloy plates and strips, which can be fully automated without manual operation, thereby improving processing efficiency and reducing labor costs. It can prevent the formation of defects such as cracks and orange peel during the casting process, and can also regulate the microstructure and properties of the plates and strips through electric pulse treatment or induction heating after forming, thereby facilitating subsequent processing. Summary of the invention

[0015] In view of the shortcomings of the prior art, the first object of the present invention is to provide an intelligent continuous casting method for precipitation-strengthened alloy plates and strips. The method provided by the present invention is energy-saving, efficiency-enhancing, and low-carbon, and can avoid the phenomenon of poor material performance and surface quality due to coarse grains, uneven structure, cracks, orange peel and other defects in the casting process.

[0016] The second object of the present invention is to provide an intelligent continuous casting device for precipitation-strengthened alloy plates and strips.

[0017] To achieve the above object, the present invention adopts the following technical solution:

[0018] The invention discloses an intelligent continuous casting method for precipitation-strengthened alloy plates and strips. The method comprises the following steps: firstly inputting initial information of the strengthened alloy plates and strips into a PC system, placing a metal raw material in a core melting cavity in a smelting system, heating the metal raw material by means of instruction parameters issued by the PC system, and electromagnetically stirring the melt obtained in the core melting cavity when the insulation temperature is reached. After the insulation is completed, the melt is flowed into a hot-cold composite zone of a forming system through a guide pipe to obtain a solid-liquid mixture. The PC system is used to control the edge temperature of the solid-liquid mixture in the hot-cold composite zone to be not lower than the core temperature. Then, the solid-liquid mixture flowing out of the forming system contacts with a guide copper plate to solidify. The solid-liquid mixture is pulled into an online rapid solid solution system along with the guide copper plate. The online rapid solid solution system is subjected to electric pulse treatment or induction heating treatment. The PC system is used to control the curling speed of the copper plate pulled into the forming system to match the energy of the electric pulse treatment or induction heating treatment to obtain an alloy plate and strip without a strengthening phase. The alloy plate and strip are then pulled out of the forming system and subjected to quenching treatment to obtain the strengthened alloy plate and strip.

[0019] The processing method of the present invention adopts automatic control throughout the whole process, and the instruction parameters issued by the PC control system are used to control the process parameters and the process. In the present invention, the metal raw material is placed in the core melting cavity of the smelting system for smelting, and the melt is electromagnetically stirred during the heat preservation process to improve the composition and organizational uniformity of the material; the melt obtained after heat preservation is first sent to the hot-cold composite zone of the molding system, and gradually cooled to initially form a solid-liquid mixture with a temperature gradient, and in the cooling process, the edge temperature of the solid-liquid mixture is controlled not to be lower than the core temperature, forming a meniscus-shaped temperature distribution from the solid phase to the liquid phase, so that the solidified shell of the plate and strip material is thickened and it is beneficial for the melt to fill its edge, inhibiting casting defects such as edge cracking, and then the solid-liquid mixture is in contact with the cross section of the copper plate to solidify. Since the edge temperature of the solid-liquid mixture is not lower than the core temperature and has undergone a cooling process, Thus, a smooth transition is formed, so that the alloy plate and strip obtained by solidification of the melt and the ingot copper plate will not produce casting defects such as orange peel. Subsequently, the solidified alloy plate and strip are pulled out by a traction system, and electric pulse treatment or induction heating and quenching treatment are carried out in the rapid solid solution section. The casting speed of the alloy plate and strip is controlled by controlling the PC system to match the energy of the electric pulse treatment or induction heating treatment, so that the precipitated phase produced in the continuous casting process is fully dissolved back into the matrix to form a supersaturated solid solution, thereby improving the processing performance of the material. At the same time, the inventors found that in the hot and cold composite zone of the forming system, since it is necessary to control the edge temperature in the forming system to be not lower than the core temperature, it is necessary to heat the edge quickly and cool the core quickly. Such a temperature gradient makes the final strengthened alloy plate and strip columnar crystals along the continuous casting direction and an alloy structure in a solid solution state without precipitation of strengthening phases.

[0020] In a preferred embodiment, the alloy structure of the strengthened alloy plate and strip is a columnar crystal structure in a solid solution state without precipitation of a strengthening phase.

[0021] In a preferred embodiment, the alloy in the precipitation-strengthened alloy plate and strip is selected from a copper alloy, a titanium alloy, a magnesium alloy, an aluminum alloy, and an iron alloy.

[0022] According to a preferred embodiment, the initial information of the precipitation-strengthened alloy plate and strip includes the flow rate of protective gas, the type of metal raw materials, the quality of metal raw materials, the melting point and boiling point of metal raw materials, the heating rate during smelting, the holding temperature, the holding time, the flow rate of metal liquid, the temperature difference threshold between the edge and the core of the solid-liquid mixture in the forming system, the cooling water flow rate, the induction heating current, the induction heating voltage, the tension, and the curling speed.

[0023] In a preferred solution, the metal raw material is heated to a temperature of Ts+(30-50)°C to obtain a melt, and then kept warm at Ts+(10-50)°C. During the warming process, electromagnetic stirring is performed simultaneously.

[0024] Ts is the melting point of the metal raw material.

[0025] By subjecting the melt during the smelting process to electromagnetic stirring, the composition and structural uniformity of the material can be improved.

[0026] Preferably, the melt flows into the molding system through the flow guide tube at a flow rate of 0.1 to 10 L / min.

[0027] The preferred solution is to detect the temperature of the melt flowing into the molding system through the guide pipe and feed it back to the PC control system. When the edge temperature is lower than the core temperature, the PC control system issues a command to cool the core of the molding system and heat the edge, so that the edge temperature T 边部 Not lower than the core temperature T 心部 , and re-measure the temperature of the solid-liquid mixture flowing out of the molding system.

[0028] Further preferably, the overall temperature T of the solid-liquid mixture is between the solidus temperature and the liquidus temperature, and T=T 液相 -(0~30℃), while T 边部 -T 心部 <50°C, preferably 10°C.

[0029] In the present invention, T 边部 -T 心部 <50℃, preferably 10℃, which is the temperature difference threshold between the edge and the core of the solid-liquid mixture in the molding system set by the PC system, T 液相The temperature of the liquidus line is as follows. The inventors found that by controlling the solid-liquid mixture at the above temperature so that the solid-liquid mixture is in a semi-solidified state and controlling the edge temperature not lower than the core temperature, the performance of the alloy strip finally obtained is defect-free. If the edge temperature is too low, defects such as cracks and orange peel will appear; if the edge temperature is too high, the cooling speed will be too slow, which will waste energy and increase costs.

[0030] According to a preferred solution, the alloy plate and strip are pulled into the online rapid solid solution system along with the ingot copper plate through a curling mechanism, and the curling speed is controlled to be 0.01 to 1 m / min during the pulling process.

[0031] According to a preferred solution, the alloy plate and strip are pulled into an online rapid solid solution system along with the ingot copper plate, and are subjected to electric pulse treatment in the online rapid solid solution system. The curling speed of the copper plate pulled into the forming system is controlled by a PC system to match the energy of the electric pulse treatment.

[0032] In a preferred embodiment, the parameters of the electric pulse treatment are: pulse current frequency 10 to 2000 Hz, current density 10 4 ~10 6 A / cm 2 .

[0033] Through electric pulse treatment, the precipitated phase produced in the solidification process of the molten metal is dissolved back to obtain a solid solution columnar crystal structure, thereby improving the processing performance of the material.

[0034] Further preferably, when the winding speed during the pulling process is 0.01 to 0.1 m / min, the parameters of the electric pulse treatment are a pulse current frequency of 10 to 200 Hz and a current density of 10 4 ~8×10 4 A / cm 2 When the winding speed is 0.1-0.3 m / min during the pulling process, the parameters of the electric pulse treatment are pulse current frequency 200-800 Hz, current density 8×10 4 ~1.5×10 5 A / cm 2 When the winding speed is 0.3-0.8 m / min during the pulling process, the parameters of the electric pulse treatment are pulse current frequency 800-2000 Hz, current density 1.5×10 5 ~10 6 A / cm 2 .

[0035] By controlling the relationship between the parameters of the electric pulse treatment and the curling speed through the PC system, the corresponding relationship is as shown in the above preferred embodiment, and an alloy sheet without precipitation of strengthening phase can be obtained.

[0036] Preferably, the quenching medium used in the quenching treatment is selected from one of water, oil and salt.

[0037] In actual operation, water medium can be used for materials with low alloy content; however, oil and salt medium with lower cooling rate should be used for materials with high alloy content.

[0038] The present invention discloses an intelligent continuous casting device for precipitation-strengthened alloy plates and strips, comprising: a PC system, a smelting system, a molding system, an online rapid solid solution system,

[0039] The PC control system is used to receive electrical signals sent by other control systems, and send corresponding instructions to other systems according to the input initial information of the enhanced alloy strip;

[0040] The smelting system comprises a core melting chamber, an electromagnetic induction coil, a flow rate controller and a flow guide tube; the core melting chamber is used to melt metal raw materials to obtain a melt, the core melting chamber is connected to an external pulse power supply to provide a pulse current for the melt, the electromagnetic induction coil is used to provide electromagnetic stirring for the melt; the flow rate controller is used to control the melt in the core melting chamber to flow smoothly into the molding system through the flow guide tube,

[0041] The molding system consists of a hot and cold composite zone, a high-efficiency heat exchange crystallizer, an induction coil A, and an electric heating rod.

[0042] The online rapid solid solution system consists of a rapid solid solution zone, a pulse power supply, a graphite brush rod, an induction coil B, and a quenching device;

[0043] The hot-cold composite zone and the rapid solid solution zone are composed of upper and lower graphite half molds, wherein the hot-cold composite zone is the front section of the upper and lower graphite half molds, and the online solid solution zone is the rear section of the upper and lower graphite half molds, wherein the melt obtained in the central melting cavity first flows into the hot-cold composite zone of the molding system through the guide pipe, and solidifies in contact with the cross section of one end of the lead casting copper plate at the connection between the hot-cold composite zone and the rapid solid solution zone, and the other end of the lead casting copper plate is connected to the curling mechanism by a hinge, which is used to pull the solidified alloy plate strip into the rapid solid solution zone along with the lead casting copper plate;

[0044] The high-efficiency heat exchange crystallizer is arranged at the core of the hot-cold composite zone of the molding system to cool the melt flowing into the hot-cold composite zone. The induction coil A and the electric heating rod are arranged at the edge of the hot-cold composite zone of the molding system to heat the melt flowing into the hot-cold composite zone.

[0045] The graphite brush rod provides pulse current to the alloy plate and strip passing through the rapid solid solution zone by connecting the positive and negative electrodes of the pulse power supply. The induction coil B is located on both sides of the graphite brush rod and is used to heat treat the alloy plate and strip passing through the rapid solid solution zone. The quenching device is arranged outside the tail of the hot and cold composite zone and is used to quench the alloy plate and strip.

[0046] Preferably, the continuous casting device further comprises a monitoring system, wherein the monitoring system comprises two thermocouple temperature sensing devices for recording the temperature of various positions of the molding system in real time and feeding back the temperature to the PC system.

[0047] Further preferably, the two thermocouple temperature sensing devices of the monitoring system, one is placed at the junction of the molding system and the smelting system, and 3 or 5 thermocouple points are set, each point is equidistant from the edge to the core and distributed in parallel; the other is set at the outlet of the hot-cold composite zone of the molding system, the former is used to monitor the temperature of the melt flowing into the molding system, and the latter is used to monitor the temperature of the solid-liquid mixture in contact with the copper plate at the outlet of the hot-cold composite zone, and 3 or 5 thermocouple points are set, each point is equidistant from the edge to the core and distributed in parallel.

[0048] In a preferred embodiment, the continuous casting device further comprises a traction system, and the traction system comprises a motor, a curling mechanism, and a guide copper plate.

[0049] In actual operation, the speed of the motor is adjusted according to the instructions issued by the PC system to control the curling speed.

[0050] In a preferred embodiment, the core melting chamber is prepared by a "graphite-alumina-graphite" three-layer spliced ​​crucible composed of two semi-cylindrical graphite crucibles and an alumina interlayer through which a high-temperature adhesive passes, and the two semi-cylindrical graphite crucibles are connected to the positive and negative electrodes of an external pulse power supply through a top cover to provide a pulse current for the molten metal.

[0051] In a preferred solution, the flow rate controller is composed of two gears meshing with an alumina plate and is placed between the furnace base and the crucible. The flow rate of the melt is controlled by the teeth on the gears, so that the melt smoothly enters the guide tube at the bottom.

[0052] In a preferred solution, the guide tube is wrapped with an asbestos layer for heat preservation. In the present invention, wrapping the guide tube with an asbestos layer is equivalent to heat preservation of the melt in the guide tube, which is equivalent to directly setting up a heat preservation zone in the smelting equipment.

[0053] Preferably, the width of the high-efficiency heat exchange crystallizer is 20-30 mm smaller than the width of the hot-cold composite zone and is placed at the end 1 / 4 of the induction coil and / or the electric heating rod, and the length of the condensing crystallizer is less than the length of the hot-cold composite zone.

[0054] In a preferred embodiment, the induction coil A and / or the electric heating rod are arranged 20-30 mm from the periphery of the edge of the hot and cold compound section of the molding system.

[0055] In a preferred solution, the induction coil B is arranged 10-30 mm on both sides of the graphite brush rod.

[0056] In a preferred solution, the quenching device includes a liquid guide pipe, a distribution nozzle, and a control valve, and the distribution nozzle is a single-phase nozzle.

[0057] In the actual operation process, according to the instructions issued by the PC control system, the nozzle equipped with the corresponding quenching medium is automatically selected for quenching.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] 1) Compared with the traditional production process of precipitation-strengthened alloy strips ("semi-continuous ingot casting-hot rolling-milling-cold rolling-solid solution-cold rolling-aging" process), the present invention provides an intelligent continuous casting device for precipitation-strengthened alloy plates and strips, which combines the casting equipment with the online rapid solution treatment equipment, divides the smelting equipment into a smelting zone and a heat preservation zone, and uses a flow rate controller to control the flow rate of the metal liquid, uses a monitoring system to monitor the temperature field of the metal liquid flowing out of the guide tube in real time, and combines with a high-efficiency heat exchange crystallizer to regulate the temperature field entering the graphite mold to prevent cracking, orange peel and other phenomena in the plate and strip; at the same time, a PC control system is used to realize the integrated intelligent control of the solidification forming and online rapid solution treatment of the alloy plate and strip, thereby improving the production efficiency and reducing the production cost.

[0060] 2) In addition, the present invention also provides an intelligent continuous casting method for precipitation-strengthened alloy plates and strips. The processing method of the present invention adopts automatic control throughout the whole process, and the instruction parameters issued by the PC control system are used to control the process parameters and process. In the present invention, the metal raw material is placed in the core melting cavity of the smelting system for smelting, and the melt is subjected to electromagnetic stirring during the insulation process to improve the composition and uniformity of the material. The melt obtained after insulation is first sent to the hot and cold composite zone of the molding system to form a higher temperature gradient along the continuous casting direction, and the temperature is gradually reduced to initially form a solid-liquid mixture. The solid-liquid mixture is formed by contacting the cross section of the ingot copper plate with the solidified solid. Since the edge temperature of the solid-liquid mixture is not lower than the core temperature and a cooling process is performed, a smooth transition is formed, so that the alloy plate and strip obtained by contacting and solidifying the melt with the ingot copper plate does not produce casting defects such as cracks and orange peel. Subsequently, the alloy plate and strip with columnar crystal structure along the continuous casting direction is pulled out by the traction system, and electric pulse treatment or induction heating treatment is performed in the rapid solid solution zone. The electric pulse heat treatment / induction heating treatment is used to dissolve the precipitated phase generated in the continuous casting process back into the matrix, improve the processing performance of the material, and control the curling speed of the ingot copper plate pulled into the forming system by controlling the PC system, matching the energy of the electric pulse treatment or induction heating, so that the solidified alloy plate and strip does not form a strengthening phase, and obtains an alloy plate and strip with no strengthening phase at all. After quenching treatment, the cooling rate of the strip is accelerated, so that the strengthening phase cannot be precipitated. Compared with the existing precipitation-strengthened alloy plate and strip processing technology, this forming process can be fully automated, without the need for manual operation, thereby improving processing efficiency and reducing labor costs.

[0061] Instruction Manual

[0062] Figure 1 This is a schematic diagram of the structure of an intelligent precipitation-strengthening alloy plate and strip device of the present invention. 1 is a PC control system; 2 is a power supply system; 3 is a smelting system; 4 is a monitoring system; 5 is a forming system; 6 is a graphite brush rod; 7 is an online rapid solid solution system; 8 is a rack; and 9 is a traction system.

[0063] Figure 2 It is the distribution diagram of each point in the detection system and the distribution diagram of the induction coil in the online rapid solid solution system.

[0064] Figure 3 This is the metallographic structure diagram of the precipitation-strengthened alloy plate and strip prepared in Example 1.

[0065] Figure 4 This is a macro product picture of the precipitation-strengthened alloy plate and strip produced in Example 1.

[0066] Figure 5This is a macro product picture of the precipitation-strengthened alloy plate and strip prepared in Comparative Example 1.

[0067] Figure 6 This is a macro product picture of the precipitation-strengthened alloy plate and strip prepared in Comparative Example 2. DETAILED DESCRIPTION

[0068] The present invention is described in detail below with reference to the accompanying drawings.

[0069] like Figure 1 As shown, this is an intelligent continuous casting device for precipitation-strengthened alloy plates and strips according to this specific embodiment, which is mainly composed of a PC control system 1, a power supply system 2, a smelting system 3, a monitoring system 4, a forming system 5, a graphite brush rod 6, an online rapid solution system 7, a frame 8, a traction system 9 and other parts.

[0070] The power supply system includes a DC power supply, an AC power supply, a pulse power supply, a transformer, etc. The power supply system is used to supply power to the PC control system, the smelting system, the detection system, the molding system, the online rapid solid solution system, and the traction system, so that the instructions issued by the PC control system are transmitted to the corresponding components to control the smelting temperature (0-1600°C), the heating rate (10-100°C / min), and the heating and heat preservation time of the smelting system. The power supply system is provided with a pulse current frequency (10-8000Hz), a pulse width (10-30000μs), and a current density (10 3 ~10 6 A / cm 2 ), power-on time. According to the temperature information fed back by the detection system, the voltage, current, heating temperature, heating time, power and other signals at both ends of the detection area in the electrical processing system are controlled. According to the temperature information, the pulse voltage, pulse current, duty cycle, processing time of the processing area in the electrical processing system, as well as the traction force and traction speed in the traction system are controlled.

[0071] The smelting system comprises a core melting chamber, an electromagnetic induction coil, a flow rate controller and a flow guide tube; the core melting chamber is used to melt metal raw materials to obtain a melt, the core melting chamber is connected to an external pulse power supply to provide a pulse current for the melt, the electromagnetic induction coil is used to provide electromagnetic stirring for the melt; the flow rate controller is used to control the melt in the core melting chamber to flow smoothly into the molding system through the flow guide tube,

[0072] The core melting cavity is prepared by a high-temperature adhesive passing through two semi-cylindrical graphite crucibles and an alumina interlayer to form a "graphite-alumina-graphite" three-layer spliced ​​crucible, and the two semi-cylindrical graphite crucibles are connected to the positive and negative electrodes of an external pulse power supply through a top cover to provide a pulse current for the metal melt;

[0073] The flow rate controller is composed of two gears meshing with an alumina plate, and is placed between the furnace base and the crucible. The flow rate of the melt is controlled by the teeth on the gears, so that the melt smoothly enters the guide tube at the bottom;

[0074] The outside of the guide pipe is wrapped with an asbestos layer for heat insulation.

[0075] The molding system is composed of a hot and cold composite zone, a high-efficiency heat exchange crystallizer, an induction coil A, and an electric heating rod.

[0076] The online rapid solid solution system consists of a rapid solid solution zone, a pulse power supply, a graphite brush rod, an induction coil B, and a quenching device;

[0077] The hot-cold composite zone and the rapid solid solution zone are composed of upper and lower graphite half molds, wherein the hot-cold composite zone is the front section of the upper and lower graphite half molds, and the online solid solution zone is the rear section of the upper and lower graphite half molds, wherein the melt obtained in the central melting cavity first flows into the hot-cold composite zone of the molding system through a guide pipe, and solidifies by contacting the cross section of one end of the lead casting copper plate at the connection between the hot-cold composite zone and the rapid solid solution zone, and the other end of the lead casting copper plate is connected to the curling mechanism by a hinge, which is used to pull the solidified alloy plate strip into the rapid solid solution zone along with the lead casting copper plate for solid solution treatment, and finally pull out the rapid solid solution section for quenching treatment;

[0078] The high-efficiency heat exchange crystallizer is arranged at the core of the hot-cold composite zone of the molding system to cool the melt flowing into the hot-cold composite zone. The induction coil A and the electric heating rod are arranged at the edge of the hot-cold composite zone of the molding system to heat the melt flowing into the hot-cold composite zone.

[0079] The graphite brush rod provides pulse current to the alloy plate and strip passing through the rapid solid solution zone by connecting the positive and negative electrodes of the pulse power supply. The induction coil B is located on both sides of the graphite brush rod and is used to heat treat the alloy plate and strip passing through the rapid solid solution zone. The quenching device is arranged outside the tail of the hot and cold composite zone and is used to quench the alloy plate and strip.

[0080] The continuous casting device also includes a monitoring system, which includes two thermocouple temperature sensing devices for real-time recording the temperature of various positions of the molding system and feeding back to the PC system.

[0081] The monitoring system has two thermocouple temperature sensing devices, one is placed at the junction of the molding system and the smelting system, with 3 or 5 thermocouple points set, each point is equidistant and parallel from the edge to the core; the other is set at the outlet of the hot-cold composite zone of the molding system, the former is used to monitor the temperature of the melt flowing into the molding system, and the latter is used to monitor the temperature of the solid-liquid mixture in contact with the copper plate at the outlet of the hot-cold composite zone, with 3 or 5 thermocouple points set, each point is equidistant and parallel from the edge to the core.

[0082] The continuous casting device also includes a traction system, which includes a motor, a curling mechanism, and a guide copper plate.

[0083] The width of the high-efficiency heat exchange crystallizer is 20-30 mm smaller than that of the hot-cold composite zone and is placed at the end 1 / 4 of the induction coil and / or the electric heating rod. The length of the condensing crystallizer is smaller than that of the hot-cold composite zone.

[0084] The induction coil A and / or the electric heating rod are arranged at 20-30 mm from the periphery of the edge of the hot and cold compound section of the molding system.

[0085] The induction coil B is arranged 10-30 mm on both sides of the graphite brush rod.

[0086] The quenching device comprises a liquid guide pipe, a distribution nozzle, and a control valve, and the distribution nozzle is a single-phase nozzle.

[0087] The specific operation includes the following steps:

[0088] 1) Data entry. Before smelting, enter the smelting process information into the PC control system, including the protective gas flow rate, metal raw material type, raw material quality, corresponding melting point temperature, boiling point temperature, heating rate, insulation temperature, insulation time, metal liquid flow rate, edge and core temperature difference threshold, cooling water flow, induction heating current, and induction heating voltage.

[0089] 2) Pretreatment. Before heating, put the metal raw materials into the core melting cavity in order from high to low melting points, close the top cover of the core melting cavity, open the flow rate controller in the base about 1 / 4, and then introduce argon protective gas. The gas flow rate is 17L / min. After about 3 to 5 minutes, close the flow rate controller and continue to introduce argon protective gas to exhaust the air in the melting cavity.

[0090] 3) Smelting. According to the instruction parameters (holding temperature, holding time, induction coil current) issued by the PC control system, the smelting system starts to heat the core melting cavity. When the holding temperature is reached, the metal liquid in the core melting cavity is electromagnetically stirred.

[0091] 4) Casting and molding monitoring. According to the command parameters (casting speed, heating temperature, heating rate, and insulation temperature) issued by the PC control system, the inside of the guide tube is inductively heated to the insulation temperature, and at the same time, the flow rate controller introduces the metal liquid in the core molten cavity into the hot and cold composite zone of the molding system through the guide tube at a specified speed. The detection system is used to detect the temperature at different positions of the entrance of the hot and cold composite zone and feed it back to the PC control system. According to the threshold set by the PC control system, when the edge temperature is lower than the core temperature, the induction coil / electric heating rod at the edge is turned on to heat the edge, and the high-efficiency heat exchange crystallizer in the cooling system of the core cools the core until the threshold set by the PC control system is met. At the same time, a second retest is performed through the detection system at the back end of the high-efficiency heat exchange crystallizer for verification.

[0092] 5) Online rapid solid solution treatment. First, one end of a copper plate or copper strip is connected to the motor of the traction system through a hinge, and the other end is placed at the junction of the rapid solid solution zone and the hot-cold composite zone. When the molten metal passes through the hot-cold composite zone and contacts the copper plate or copper strip, it solidifies and adheres to the copper plate or copper strip. The motor drives the copper plate or copper strip to move to the rapid solid solution zone. At this time, according to the instruction parameters (induction current, heating time, pulse voltage, pulse current, duty cycle, traction speed) issued by the PC control system, the processing section is heated or treated with electric pulses to adjust the microstructure of the metal in the hot-cold composite zone; when the induction current is used for the heat treatment process, the PC control system is issued with instructions, and the heating speed, insulation temperature, and traction speed are adjusted according to the information fed back by the PC control system; when the pulse current is used for the heat treatment process, the PC control system is issued with instructions, and the pulse voltage, pulse current, duty cycle, and traction speed are adjusted according to the information fed back by the PC control system; finally, the metal plate and strip are pulled out of the rapid solid solution zone.

[0093] The present invention also provides an intelligent precipitation-strengthened alloy plate and strip continuous casting method developed using the above device, which is applicable to aluminum alloys, copper alloys, magnesium alloys, titanium alloys and other metals. It will be further described below in conjunction with the embodiments.

[0094] Example 1

[0095] An intelligent continuous casting method for precipitation-strengthened alloy plates and strips, taking Cu-Ni-Co-Si alloy as an example, comprises the following steps:

[0096] 1) Data entry. Before smelting, the smelting process information is entered into the PC control system, including the protective gas flow rate (15-20L / min), the type of metal raw materials (Cu, Ni, Co, Si), the raw material mass (Cu: 969g; Ni: 11g; Co: 14g; Si: 6g), the corresponding melting point temperature (Cu: 1083℃; Ni: 1453℃; Co: 1495℃; Si: 1410℃), the heating rate (30℃ / min), the edge and core temperature difference threshold (10℃), and the heating temperature, insulation temperature, insulation time, metal liquid flow rate, cooling water flow (600L / h), induction heating current, and pulse frequency are calculated through the model.

[0097] 2) Pretreatment. Before heating, put the metal raw materials into the core melting chamber in the order of Co, Ni, Si, and Cu, close the top cover of the core melting chamber, open the flow rate controller in the base about 1 / 4, and then introduce argon protective gas. The gas flow rate is 17L / min. After about 3 to 5 minutes, close the flow rate controller and continue to introduce argon protective gas to exhaust the air in the melting chamber.

[0098] 3) Smelting. According to the instruction parameters issued by the PC control system (heating temperature is 1250℃, holding temperature is 1250℃, holding time is 5min, magnetic field strength is 2000Gs), the smelting system starts to heat the core melting cavity. When the holding temperature is reached, the metal liquid in the core melting cavity is electromagnetically stirred.

[0099] 4) Casting and molding monitoring. According to the instruction parameters issued by the PC control system (heating rate 30℃ / min, insulation temperature 1250℃), the inside of the guide tube is inductively heated to the insulation temperature. At the same time, the flow rate controller introduces the metal liquid in the core melting cavity into the hot and cold composite zone of the molding system through the guide tube at a specified speed of 1L / min. The detection system is used to detect the temperature at different positions of the entrance of the hot and cold composite zone and feed it back to the PC control system. According to the threshold set by the PC control system, when the edge temperature is lower than the core temperature, the induction coil / electric heating rod at the edge is turned on to heat the edge, and the high-efficiency heat exchange crystallizer in the cooling system of the core cools the core until the threshold set by the PC control system is met. At the same time, the temperature of the obtained solid-liquid mixture is controlled to 1150℃, and the detection system at the back end of the high-efficiency heat exchange crystallizer is used for a second retest for verification.

[0100] 5) Online rapid solution treatment. First, one end of a copper plate or copper strip is connected to the motor of the traction system through a hinge, and the other end is placed at the junction of the rapid solution zone and the cooling system. When the molten metal passes through the hot-cold composite zone and contacts the ingot copper plate or copper strip, it solidifies and bonds with the ingot copper plate or copper strip. The motor is used to drive the copper plate or copper strip to move to the rapid solution zone. At this time, according to the command parameters issued by the PC control system, induction heating or electric pulse treatment is performed in the rapid solution zone to adjust the microstructure of the metal in the hot-cold composite zone; when the induction current is used for the heat treatment process, a command is issued to the PC control system, and the heating speed is adjusted to 60℃ / min, the insulation temperature is adjusted to 850℃, and the traction speed is adjusted to 0.05m / min according to the information fed back by the PC control system; when the pulse current is used for the heat treatment process, a command is issued to the PC control system, and the pulse voltage is adjusted to 10v and the pulse current density is adjusted to 5×10 4 A / cm 2 , pulling speed is 0.05m / min; finally, the metal plate and strip are pulled out of the rapid solid solution zone.

[0101] Figure 3 This is a metallographic structure diagram of the precipitation-strengthened alloy plate and strip prepared in Example 1. As can be seen from the figure, the obtained strengthened alloy plate and strip is a single-phase solid solution, without precipitation of strengthening phase, and has a columnar crystal morphology.

[0102] Figure 4 This is a macro product picture of the precipitation-strengthened alloy plate and strip obtained in Example 1. It can be seen from the picture that the obtained plate is smooth and has no defects.

[0103] Example 2

[0104] An intelligent continuous casting method for precipitation-strengthened alloy plates and strips, taking Cu-Ni-Co-Si alloy as an example, comprises the following steps:

[0105] 1) Data entry. Before smelting, the smelting process information is entered into the PC control system, including the protective gas flow rate (15-20L / min), the type of metal raw materials (Cu, Ni, Co, Si), the raw material mass (Cu: 969g; Ni: 11g; Co: 14g; Si: 6g), the corresponding melting point temperature (Cu: 1083℃; Ni: 1453℃; Co: 1495℃; Si: 1410℃), the heating rate (30℃ / min), the edge and core temperature difference threshold (10℃), and the heating temperature, insulation temperature, insulation time, metal liquid flow rate, cooling water flow (600L / h), induction heating current, and pulse frequency are calculated through the model.

[0106] 2) Pretreatment. Before heating, put the metal raw materials into the core melting chamber in the order of Co, Ni, Si, and Cu, close the top cover of the core melting chamber, open the flow rate controller in the base about 1 / 4, and then introduce argon protective gas. The gas flow rate is 17L / min. After about 3 to 5 minutes, close the flow rate controller and continue to introduce argon protective gas to exhaust the air in the melting chamber.

[0107] 3) Smelting. According to the instruction parameters issued by the PC control system (heating temperature is 1250℃, holding temperature is 1220℃, holding time is 5min, magnetic field strength is 3000Gs), the smelting system starts to heat the core melting cavity. When the holding temperature is reached, the metal liquid in the core melting cavity is electromagnetically stirred.

[0108] 4) Casting. According to the instruction parameters issued by the PC control system (heating rate 30℃ / min, insulation temperature 1220℃), the inside of the guide tube is inductively heated to the insulation temperature, and at the same time, the flow rate controller introduces the metal liquid in the core melting cavity into the hot and cold composite zone through the guide tube at a specified speed of 3L / min. The detection system is used to detect the temperature at different positions of the entrance of the hot and cold composite zone and feed it back to the PC control system. According to the threshold set by the PC control system, when the edge temperature is lower than the core temperature, the induction coil of the edge is turned on to heat the edge, and the high-efficiency heat exchange crystallizer in the cooling system of the core cools the core until the threshold set by the PC control system is met. At the same time, the temperature of the solid-liquid mixture is controlled to be 1150℃, and the detection system at the back end of the high-efficiency heat exchange crystallizer is used for a second retest for verification.

[0109] 5) Online rapid solution treatment. First, one end of a guide copper plate or copper strip is connected to the motor of the traction system through a hinge, and the other end is placed at the junction of the rapid solution zone and the hot-cold composite zone. When the molten metal passes through the hot-cold composite zone and contacts the guide copper plate or copper strip, it solidifies and bonds with the guide copper plate or copper strip. The motor is used to drive the copper plate or copper strip to move to the rapid solution zone. At this time, according to the command parameters issued by the PC control system, induction heating or electric pulse treatment is performed in the rapid solution zone to adjust the microstructure of the metal in the hot-cold composite zone; when the induction current is used for the heat treatment process, a command is issued to the PC control system, and the heating speed is adjusted to 60℃ / min, the insulation temperature is adjusted to 900℃, and the traction speed is adjusted to 0.1m / min according to the information fed back by the PC control system; when the pulse current is used for the heat treatment process, a command is issued to the PC control system, and the pulse voltage is adjusted to 12v and the pulse current density is adjusted to 1×10 5 A / cm 2 , pulling speed 0.1m / min; finally, the metal plate and strip are pulled out of the rapid solid solution zone. The strengthened alloy plate and strip obtained in this embodiment is a single-phase solid solution without precipitation of strengthening phase.

[0110] Example 3

[0111] An intelligent continuous casting method for precipitation-strengthened alloy plates and strips, taking Cu-Ni-Co-Si alloy as an example, comprises the following steps:

[0112] 1) Data entry. Before smelting, the smelting process information is entered into the PC control system, including the protective gas flow rate (15-20L / min), the type of metal raw materials (Cu, Ni, Co, Si), the raw material mass (Cu: 969g; Ni: 11g; Co: 14g; Si: 6g), the corresponding melting point temperature (Cu: 1083℃; Ni: 1453℃; Co: 1495℃; Si: 1410℃), the heating rate (30℃ / min), the edge and core temperature difference threshold (10℃), and the heating temperature, insulation temperature, insulation time, metal liquid flow rate, cooling water flow (600L / h), induction heating current, and pulse frequency are calculated through the model.

[0113] 2) Pretreatment. Before heating, put the metal raw materials into the core melting chamber in the order of Co, Ni, Si, and Cu, close the top cover of the core melting chamber, open the flow rate controller in the base about 1 / 4, and then introduce argon protective gas. The gas flow rate is 17L / min. After about 3 to 5 minutes, close the flow rate controller and continue to introduce argon protective gas to exhaust the air in the melting chamber.

[0114] 3) Smelting. According to the instruction parameters issued by the PC control system (heating temperature is 1220℃, holding temperature is 1220℃, holding time is 5min, magnetic field strength is 4000Gs), the smelting system starts to heat the core melting cavity. When the holding temperature is reached, the metal liquid in the core melting cavity is electromagnetically stirred.

[0115] 4) Casting. According to the instruction parameters issued by the PC control system (heating rate 30℃ / min, insulation temperature 1220℃), the inside of the guide tube is inductively heated to the insulation temperature, and at the same time, the flow rate controller introduces the metal liquid in the core melting cavity into the hot and cold composite zone through the guide tube at a specified speed of 5L / min. The detection system is used to detect the temperature at different positions of the entrance of the hot and cold composite zone and feed it back to the PC control system. According to the threshold set by the PC control system, when the edge temperature is lower than the core temperature, the induction coil / electric heating rod at the edge is turned on to heat the edge, and the high-efficiency heat exchange crystallizer in the core cooling system cools the core until the threshold set by the PC control system is met. At the same time, the temperature of the solid-liquid mixture is controlled to be 1150℃, and the detection system at the back end of the high-efficiency heat exchange crystallizer is used for a second retest for verification.

[0116] 5) Online rapid solid solution treatment. First, one end of a guide copper plate or copper strip is connected to the motor of the traction system through a hinge, and the other end is placed at the junction of the rapid solid solution zone and the hot-cold composite zone. When the molten metal passes through the hot-cold composite zone and contacts the guide copper plate or copper strip, it solidifies and adheres to the guide copper plate or copper strip. The motor is used to drive the guide copper plate or copper strip to move to the rapid solid solution zone. At this time, according to the command parameters issued by the PC control system, induction heating or electric pulse treatment is performed in the rapid solid solution to adjust the microstructure of the metal in the hot-cold composite section; when the induction current is used for the heat treatment process, a command is issued to the PC control system, and the heating speed is adjusted to 60℃ / min, the insulation temperature is adjusted to 850℃, and the traction speed is adjusted to 0.05m / min according to the information fed back by the PC control system; when the pulse current is used for the heat treatment process, a command is issued to the PC control system, and the pulse voltage is adjusted to 10v and the pulse current density is adjusted to 5×10 4 A / cm 2 , pulling speed 0.05m / min; finally, the metal plate and strip are pulled out of the rapid solid solution zone. The strengthened alloy plate and strip obtained in this embodiment is a single-phase solid solution without precipitation of strengthening phase.

[0117] Example 4

[0118] An intelligent continuous casting method for precipitation-strengthened alloy plates and strips, taking Fe-Cu-Zn-Mg alloy as an example, comprises the following steps:

[0119] 1) Data entry. Before smelting, the smelting process information is first entered into the PC control system, including the protective gas flow rate (15-20L / min), the type of metal raw materials (Fe, Cu, Zn, Mg), the corresponding melting point temperature (Cu: 1083℃; Fe: 1538℃; Zn: 419℃; Mg: 651℃), the heating rate (30℃ / min), the edge and core temperature difference threshold (10℃), and the heating temperature, insulation temperature, insulation time, metal liquid flow rate, cooling water flow (600L / h), induction heating current, and pulse frequency are calculated through the model.

[0120] 2) Pretreatment. Before heating, put the metal raw materials into the core melting chamber in the order of Fe, Cu, Zn, and Mg, close the top cover of the core melting chamber, open the flow rate controller in the base about 1 / 4, and then introduce argon protective gas. The gas flow rate is 17L / min. After about 3 to 5 minutes, close the flow rate controller and continue to introduce argon protective gas to exhaust the air in the melting chamber.

[0121] 3) Smelting. According to the instruction parameters issued by the PC control system (heating temperature is 1220℃, holding temperature is 1220℃, holding time is 5min, magnetic field strength is 4000Gs), the smelting system starts to heat the core melting cavity. When the holding temperature is reached, the metal liquid in the core melting cavity is electromagnetically stirred.

[0122] 4) Casting. According to the instruction parameters issued by the PC control system (heating rate 30℃ / min, insulation temperature 1520℃), the inside of the guide tube is inductively heated to the insulation temperature, and at the same time, the flow rate controller introduces the metal liquid in the core melting cavity into the hot and cold composite zone through the guide tube at a specified speed of 3L / min. The detection system is used to detect the temperature at different positions of the entrance of the hot and cold composite zone and feed it back to the PC control system. According to the threshold set by the PC control system, when the edge temperature is lower than the core temperature, the induction coil / electric heating rod at the edge is turned on to heat the edge, and the high-efficiency heat exchange crystallizer in the core cools the core until the threshold set by the PC control system is met. At the same time, the temperature of the solid-liquid mixture is controlled to be 1150℃, and a second retest is performed through the detection system at the back end of the high-efficiency heat exchange crystallizer for verification.

[0123] 5) Online rapid solution treatment. First, one end of a guide copper plate or copper strip is connected to the motor of the traction system through a hinge, and the other end is placed at the junction of the rapid solution zone and the hot-cold composite zone. When the molten metal passes through the hot-cold composite zone and contacts the copper plate or copper strip, it solidifies and bonds with the guide copper plate or copper strip. The motor is used to drive the guide copper plate or copper strip to move to the rapid solution zone. At this time, according to the command parameters issued by the PC control system, induction heating or electric pulse treatment is performed in the rapid solution zone to adjust the microstructure of the metal in the hot-cold composite zone; when the induction current is used for the heat treatment process, a command is issued to the PC control system, and the heating speed is adjusted to 60℃ / min, the insulation temperature is adjusted to 850℃, and the traction speed is adjusted to 0.05m / min according to the information fed back by the PC control system; when the pulse current is used for the heat treatment process, a command is issued to the PC control system, and the pulse voltage is adjusted to 10v and the pulse current density is adjusted to 5×10 4 A / cm 2 , pulling speed 0.05m / min; finally, the metal plate and strip are pulled out of the rapid solid solution zone. The strengthened alloy plate and strip obtained in this embodiment is a single-phase solid solution without precipitation of strengthening phase.

[0124] Comparative Example 1

[0125] The other conditions of this comparative example are the same as those of Example 1, except that the pulling speed during the online rapid solution treatment is adjusted to 2 m / min, and the steps are as follows:

[0126] 1) Data entry. Before smelting, the smelting process information is entered into the PC control system, including the protective gas flow rate (15-20L / min), the type of metal raw materials (Cu, Ni, Co, Si), the raw material mass (Cu: 969g; Ni: 11g; Co: 14g; Si: 6g), the corresponding melting point temperature (Cu: 1083℃; Ni: 1453℃; Co: 1495℃; Si: 1410℃), the heating rate (30℃ / min), the edge and core temperature difference threshold (10℃), and the heating temperature, insulation temperature, insulation time, metal liquid flow rate, cooling water flow (600L / h), induction heating current, and pulse frequency are calculated through the model.

[0127] 2) Pretreatment. Before heating, put the metal raw materials into the core melting chamber in the order of Co, Ni, Si, and Cu, close the top cover of the core melting chamber, open the flow rate controller in the base about 1 / 4, and then introduce argon protective gas. The gas flow rate is 17L / min. After about 3 to 5 minutes, close the flow rate controller and continue to introduce argon protective gas to exhaust the air in the melting chamber.

[0128] 3) Smelting. According to the instruction parameters issued by the PC control system (heating temperature is 1250℃, holding temperature is 1250℃, holding time is 5min, magnetic field strength is 2000Gs), the smelting system starts to heat the core melting cavity. When the holding temperature is reached, the metal liquid in the core melting cavity is electromagnetically stirred.

[0129] 4) Casting. According to the instruction parameters issued by the PC control system (heating rate 30℃ / min, insulation temperature 1250℃), the inside of the guide tube is induction heated to the insulation temperature, and at the same time, the flow rate controller introduces the metal liquid in the core molten cavity into the hot and cold composite zone through the guide tube at a specified speed of 1L / min. The detection system is used to detect the temperature at different positions of the entrance of the rapid solid solution zone and feed it back to the PC control system. According to the threshold set by the PC control system, when the edge temperature is lower than the core temperature, the induction coil / electric heating rod in the edge temperature control system is turned on to heat the edge, and the high-efficiency heat exchange crystallizer in the core cools the core until the threshold set by the PC control system is met. At the same time, a second retest is performed through the detection system at the back end of the high-efficiency heat exchange crystallizer for verification.

[0130] 5) Online rapid solution treatment. First, one end of a guide copper plate or copper strip is connected to the motor of the traction system through a hinge, and the other end is placed at the junction of the rapid solution zone and the hot-cold composite zone. When the molten metal passes through the hot-cold composite zone and contacts the guide copper plate or copper strip, it solidifies and bonds with the guide copper plate or copper strip. The motor is used to drive the copper plate or copper strip to move to the rapid solution zone. At this time, according to the command parameters issued by the PC control system, induction heating or electric pulse treatment is performed in the rapid solution zone to adjust the microstructure of the metal in the hot-cold composite zone; when the induction current is used for the heat treatment process, a command is issued to the PC control system, and the heating speed is adjusted to 60℃ / min, the insulation temperature is adjusted to 850℃, and the traction speed is adjusted to 2m / min according to the information fed back by the PC control system; when the pulse current is used for the heat treatment process, a command is issued to the PC control system, and the pulse voltage is adjusted to 10v and the pulse current density is adjusted to 5×10 4 A / cm 2 , pulling speed is 2m / min; finally, the metal plate and strip are pulled out of the rapid solid solution zone. Figure 5 This is a macro product picture of the precipitation-strengthened alloy plate and strip prepared in Comparative Example 1.

[0131] Comparative Example 2

[0132] The other conditions of this comparative example are the same as those of Example 1, except that the edge heating portion in the hot-cold composite zone is eliminated, and the steps are as follows:

[0133] 1) Data entry. Before smelting, the smelting process information is entered into the PC control system, including the protective gas flow rate (15-20L / min), the type of metal raw materials (Cu, Ni, Co, Si), the raw material mass (Cu: 969g; Ni: 11g; Co: 14g; Si: 6g), the corresponding melting point temperature (Cu: 1083℃; Ni: 1453℃; Co: 1495℃; Si: 1410℃), the heating rate (30℃ / min), the edge and core temperature difference threshold (10℃), and the heating temperature, insulation temperature, insulation time, metal liquid flow rate, cooling water flow (600L / h), induction heating current, and pulse frequency are calculated through the model.

[0134] 2) Pretreatment. Before heating, put the metal raw materials into the core melting chamber in the order of Co, Ni, Si, and Cu, close the top cover of the core melting chamber, open the flow rate controller in the base about 1 / 4, and then introduce argon protective gas. The gas flow rate is 17L / min. After about 3 to 5 minutes, close the flow rate controller and continue to introduce argon protective gas to exhaust the air in the melting chamber.

[0135] 3) Smelting. According to the instruction parameters issued by the PC control system (heating temperature is 1350℃, holding temperature is 1250℃, holding time is 5min, magnetic field strength is 2000Gs), the smelting system starts to heat the core melting cavity. When the holding temperature is reached, the metal liquid in the core melting cavity is electromagnetically stirred.

[0136] 4) Casting. According to the instruction parameters issued by the PC control system (heating rate 30℃ / min, insulation temperature 1250℃), the inside of the guide tube is induction heated to the insulation temperature, and at the same time, the flow rate controller introduces the metal liquid in the core molten cavity into the hot and cold composite zone through the guide tube at a specified speed of 1L / min.

[0137] 5) Rapid solution treatment. First, one end of a copper plate or copper strip is connected to the motor of the traction system through a hinge, and the other end is placed at the junction of the rapid solution zone and the hot-cold composite zone. When the molten metal passes through the hot-cold composite zone and contacts the copper plate or copper strip, it solidifies and adheres to the copper plate or copper strip. The motor is used to drive the copper plate or copper strip to move to the rapid solution zone. At this time, according to the command parameters issued by the PC control system, induction heating or electric pulse treatment is carried out in the rapid solution zone to adjust the microstructure of the metal in the hot-cold composite zone; when the induction current is used for the heat treatment process, a command is issued to the PC control system, and the heating speed is adjusted to 60℃ / min, the insulation temperature is adjusted to 850℃, and the traction speed is adjusted to 5m / min according to the information fed back by the PC control system; when the pulse current is used for the heat treatment process, a command is issued to the PC control system, and the pulse voltage is adjusted to 10v and the pulse current density is adjusted to 5×10 4 A / cm 2 , pulling speed is 2m / min; finally, the metal plate and strip are pulled out of the rapid solid solution zone. Figure 6 This is a macro product picture of the precipitation-strengthened alloy plate and strip prepared in Comparative Example 2.

Claims

1. An intelligent continuous casting method for precipitation-strengthened alloy plates and strips, characterized in that: First, the initial information of the strengthened alloy plate and strip is entered into the PC control system, and the metal raw material is placed in the core melting cavity of the smelting system. The metal raw material is heated according to the instruction parameters issued by the PC control system. When the insulation temperature is reached, the melt obtained in the core melting cavity is electromagnetically stirred. After the insulation is completed, the melt flows into the hot-cold composite zone of the forming system through a guide pipe to obtain a solid-liquid mixture. The PC control system controls the edge temperature of the solid-liquid mixture in the hot-cold composite zone to be not lower than the core temperature. Then, the solid-liquid mixture flowing out of the forming system contacts with the ingot copper plate to solidify, and is pulled into the online rapid solid solution system with the ingot copper plate. The online rapid solid solution system is subjected to electric pulse treatment or induction heating treatment, and the curling speed of the copper plate pulled into the forming system is controlled by the PC control system to match the energy of the electric pulse treatment or induction heating treatment to obtain an alloy plate and strip without a strengthening phase. Subsequently, the alloy plate and strip are pulled out of the forming system and subjected to quenching treatment to obtain a strengthened alloy plate and strip.

2. The intelligent continuous casting method of precipitation-strengthened alloy sheet and strip according to claim 1, characterized in that: The alloy structure of the reinforced alloy plate and strip is a solid solution columnar crystal structure without reinforcement phase precipitation; The alloy in the precipitation-strengthened alloy plate and strip is selected from a copper alloy, a titanium alloy, a magnesium alloy, an aluminum alloy, and an iron alloy; The initial information of the precipitation-strengthened alloy plate and strip includes the flow rate of protective gas, the type of metal raw materials, the quality of metal raw materials, the melting point temperature and boiling point temperature of metal raw materials, the heating rate during smelting, the holding temperature, the holding time, the flow rate of metal liquid, the temperature difference threshold between the edge and the core of the solid-liquid mixture in the forming system, the cooling water flow rate, the induction heating current, the induction heating voltage, the tension, and the curling speed.

3. The intelligent continuous casting method of precipitation-strengthened alloy sheet and strip according to claim 1, characterized in that: The metal raw material is heated to a temperature of Ts+(30~50)℃ to obtain a melt, and then kept warm at Ts+(10~50)℃. During the warming process, electromagnetic stirring is performed simultaneously; The melt flows into the molding system through the guide tube at a flow rate of 0.1-10 L / min.

4. The intelligent continuous casting method of precipitation-strengthened alloy sheet and strip according to claim 1, characterized in that: By detecting the temperature of the melt flowing into the molding system through the guide tube and feeding it back to the PC control system, when the edge temperature is lower than the core temperature, the PC control system issues a command to cool the core of the molding system and heat the edge, so that the edge temperature T 边部 Not lower than the core temperature T 心部 , and retest the temperature of the solid-liquid mixture flowing out of the molding system; The overall temperature T of the solid-liquid mixture is between the solidus temperature and the liquidus temperature, and the control T=T 液相 - (0~30℃); at the same time T 边部 -T 心部 <50℃.

5. The intelligent continuous casting method of precipitation-strengthened alloy sheet and strip according to claim 1, characterized in that: The alloy plate and strip are pulled into the online rapid solid solution system along with the ingot copper plate through the curling mechanism, and the curling speed is controlled to be 0.01~1m / min during the pulling process; The parameters of the electric pulse treatment are: pulse current frequency 10~2000 Hz, current density 10 4 ~10 6 A / cm 2 .

6. The intelligent continuous casting method of precipitation-strengthened alloy sheet and strip according to claim 5, characterized in that: When the curling speed during the pulling process is 0.01~0.1m / min, the parameters of the electric pulse treatment are pulse current frequency 10~200Hz, current density 10 4 ~8×10 4 A / cm 2 When the winding speed is 0.1-0.3 m / min during the pulling process, the parameters of the electric pulse treatment are pulse current frequency 200-800 Hz, current density 8×10 4 ~1.5×10 5 A / cm 2 When the winding speed during the pulling process is 0.3-0.8 m / min, the parameters of the electric pulse treatment are pulse current frequency 800-2000 Hz and current density 1.5×10 5 ~10 6 A / cm 2 .

7. An intelligent continuous casting device for precipitation-strengthened alloy plates and strips, characterized in that: Includes: PC control system, smelting system, molding system, online rapid solid solution system, The PC control system is used to receive electrical signals sent by other control systems, and send corresponding instructions to other systems according to the input initial information of the enhanced alloy strip; The smelting system comprises a core melting chamber, an electromagnetic induction coil, a flow rate controller and a flow guide tube; the core melting chamber is used to melt metal raw materials to obtain a melt, the core melting chamber is connected to an external pulse power supply to provide a pulse current for the melt, the electromagnetic induction coil is used to provide electromagnetic stirring for the melt; the flow rate controller is used to control the melt in the core melting chamber to flow smoothly into the molding system through the flow guide tube, The molding system consists of a hot and cold composite zone, a high-efficiency heat exchange crystallizer, an induction coil A, and an electric heating rod. The online rapid solid solution system consists of a rapid solid solution zone, a pulse power supply, a graphite brush rod, an induction coil B, and a quenching device; The hot-cold composite zone and the rapid solid solution zone are composed of upper and lower graphite half molds, wherein the hot-cold composite zone is the front section of the upper and lower graphite half molds, and the online solid solution zone is the rear section of the upper and lower graphite half molds, wherein the melt obtained in the central melting cavity first flows into the hot-cold composite zone of the molding system through the guide pipe, and solidifies in contact with the cross section of one end of the lead casting copper plate at the connection between the hot-cold composite zone and the rapid solid solution zone, and the other end of the lead casting copper plate is connected to the curling mechanism by a hinge, which is used to pull the solidified alloy plate strip into the rapid solid solution zone along with the lead casting copper plate; The high-efficiency heat exchange crystallizer is arranged at the core of the hot-cold composite zone of the molding system to cool the melt flowing into the hot-cold composite zone. The induction coil A and the electric heating rod are arranged at the edge of the hot-cold composite zone of the molding system to heat the melt flowing into the hot-cold composite zone. The graphite brush rod provides pulse current to the alloy plate and strip passing through the rapid solid solution zone by connecting the positive and negative electrodes of the pulse power supply. The induction coil B is located on both sides of the graphite brush rod and is used to heat treat the alloy plate and strip passing through the rapid solid solution zone. The quenching device is arranged outside the tail of the hot and cold composite zone and is used to quench the alloy plate and strip.

8. The intelligent continuous casting device for precipitation-strengthened alloy plates and strips according to claim 7, characterized in that: The continuous casting device also includes a monitoring system, which includes two thermocouple temperature sensing devices for real-time recording the temperature of various positions of the molding system and feeding back to the PC control system; The two thermocouple temperature sensing devices of the monitoring system, one is placed at the junction of the molding system and the smelting system, 3 or 5 thermocouple points are set, each point is equidistant from the edge to the core and distributed in parallel; the other is set at the outlet of the hot-cold composite zone of the molding system, the former is used to monitor the temperature of the melt flowing into the molding system, and the latter is used to monitor the temperature of the solid-liquid mixture in contact with the copper plate at the outlet of the hot-cold composite zone, 3 or 5 thermocouple points are set, each point is equidistant from the edge to the core and distributed in parallel; The continuous casting device also includes a traction system, which includes a motor, a curling mechanism, and a guide copper plate.

9. The intelligent continuous casting device for precipitation-strengthened alloy plates and strips according to claim 7, characterized in that: The core melting cavity is prepared by a high-temperature adhesive passing through two semi-cylindrical graphite crucibles and an alumina interlayer to form a "graphite-alumina-graphite" three-layer spliced ​​crucible, and the two semi-cylindrical graphite crucibles are connected to the positive and negative electrodes of an external pulse power supply through a top cover to provide a pulse current for the metal melt; The flow rate controller is composed of two gears meshing with an alumina plate, and is placed between the furnace base and the crucible. The flow rate of the melt is controlled by the teeth on the gears, so that the melt smoothly enters the guide tube at the bottom; The outside of the guide pipe is wrapped with an asbestos layer for heat insulation.

10. The intelligent continuous casting device for precipitation-strengthened alloy plates and strips according to claim 7, characterized in that: The width of the high-efficiency heat exchange crystallizer is 20-30 mm smaller than the width of the hot-cold composite zone, and is placed at the end 1 / 4 of the induction coil and / or the electric heating rod. The length of the high-efficiency heat exchange crystallizer is less than the length of the hot-cold composite zone; The induction coil A and / or the electric heating rod are arranged at 20-30 mm from the periphery of the edge of the hot and cold compound section of the molding system; The induction coil B is arranged on both sides of the graphite brush rod 10-30mm; The quenching device comprises a liquid guide pipe, a distribution nozzle, and a control valve, and the distribution nozzle is a single-phase nozzle.

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