671 results about "Electromagnetic stirring" patented technology

The invention relates to the technical field of steel structure welding assembly, and discloses a dynamic cooperative control steel structure welding assembly production line and an operation method thereof, which are used for automatic welding and deformation correction of H-shaped steel components. The production line comprises a feeding area, an assembling area, a welding station and a correction detection area. Global cooperative control is achieved through a distributed supporting system, a multi-dimensional sensor monitoring system and a cooperative robot system. The distributed supporting system is composed of dynamic roller bed units, the supporting height is adjusted in real time through a pressure sensor array and a micro hydraulic actuator, and workpiece droop is counteracted. The multi-dimensional sensor monitoring system collects temperature, strain and morphology data in real time; the welding robot and the correction robot synchronously apply electromagnetic stirring to optimize a welding seam during welding, and ultrasonic peening and laser heating are combined to reduce residual stress during correction. The industrial control computer dynamically adjusts welding parameters, supporting force and a correction strategy through sensor data, and high-precision straightness and low-residual-stress control is achieved.

The invention provides a high-homogenization medium-low carbon alloy steel large-section rectangular blank and a preparation method, and belongs to the field of special steel continuous casting. The medium-low carbon alloy steel comprises, by mass, 0.2%-0.45% of C, 0.5%-1.1% of Cr and Mn in alloy, 0.01%-0.1% of Ti in alloy, and the section of the medium-low carbon alloy steel is 320-390 mm * 385-510 mm. The electromagnetic stirring mode that the stirring frequency determined by the maximum electromagnetic stirring force is matched with weak crystallizer electromagnetic stirring and strong solidification tail end electromagnetic stirring is adopted, the strong secondary cooling specific water flow is combined, and the position of a solidification tail end electromagnetic stirrer is the position where the center solid fraction is 0.1-0.2. The press-down position is 0.25-0.85, the press-down amount is 5-12 mm, the press-down position is 0.9-1, and the press-down amount is 5-6 mm. According to the method, the component uniformity of the section of the casting blank can be remarkably improved, and macroscopic frame segregation is improved.

According to the technical scheme, the efficient hot-dip galvanizing method based on the zinc liquid purification technology comprises the following steps of incoming material inspection, degreasing, acid pickling, rinsing, plating assisting, drying, hot-dip galvanizing, zinc draining and cooling, and the hot-dip galvanizing process is dynamically matched with electromagnetic stirring strength through gradual temperature control; based on a temperature-iron content response curve, parameters of all procedures are accurately controlled, temperature dynamic adjustment is achieved, collaborative optimization of the zinc liquid purification and slag salvaging process is achieved, and the method has the advantages that zinc slag is reduced, the coating uniformity is improved, and energy consumption is reduced.

The invention belongs to the technical field of non-quenched and tempered steel, and relates to non-quenched and tempered steel for a 12.9-grade wind power bolt and a production method of the non-quenched and tempered steel. According to the method, the component design of steel is optimized, and the steel comprises 0.20%-0.25% of C, 1.30%-1.50% of Si, 1.90%-2.20% of Mn and 0.0090%-0.0150% of N; the key process control comprises the following steps: (1) LF refining nitrogen alloying; (2) continuous casting weak cooling and electromagnetic stirring; (3) carrying out controlled rolling at 1200 + / -15 DEG C, heating at 780-830 DEG C, and (4) quickly cooling after rolling, feeding on a cooling bed at the temperature of 580 + / -30 DEG C, and tempering at the medium temperature of 400 + / -20 DEG C; the obtained non-quenched and tempered steel directly meets the performance requirements of 12.9-grade bolts: Rm is larger than or equal to 1200 MPa,-40 DEG C KV2 is larger than or equal to 30 J, the yield ratio RP0.2 / Rm is larger than or equal to 0.9, a traditional quenching and tempering heat treatment procedure is omitted, and the non-quenched and tempered steel is suitable for manufacturing the high-strength wind power bolts with the diameter being 30-70 mm.

The invention provides a light high-strength high-temperature-resistant high-entropy alloy as well as a preparation method and application thereof, and relates to the technical field of high-temperature alloys. The light-weight high-strength high-temperature-resistant high-entropy alloy is composed of seven elements of Al, Cr, Mo, Nb, Ni, Ti and V. The chemical components are AlaCrbMocNbdNieTifVg, 10 < = a < = 15, 10 < = b < = 20, 5 < = c < = 10, 10 < = d < = 20, 5 < = e < = 10, 5 < = f < = 10, 30 < = g < = 40, and a + b + c + d + e + f + g = 10. The light high-strength high-temperature-resistant high-entropy alloy is prepared through raw material weighing, grinding and ultrasonic cleaning in the raw materials, vacuum degree in smelting and casting, argon adjustment, multiple times of smelting and electromagnetic stirring and solution treatment. The light high-strength high-temperature-resistant high-entropy alloy has excellent compressive strength, yield strength and hardness at room temperature and high temperature; the preparation method is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

The utility model discloses an argon bottom blowing device for improving the purity of molten steel. The argon bottom blowing device comprises a tundish, a water gap is formed in one side of the bottom face of the tundish, an electromagnetic stirrer is arranged on the outer side of the water gap, an air brick is arranged above the water gap in the tundish, and an argon conveying pipe is arranged at the bottom of the air brick. The gas permeable brick is arranged above the water gap, argon is blown into molten steel, the argon directly acts on molten steel flow, a gas curtain wall is formed around the water gap, floating and removal of inclusions are promoted, the purity of the molten steel is improved, the gas permeable brick is used in cooperation with the electromagnetic stirrer, the molten steel can be effectively stirred, a stirring blind area is eliminated, and the service life of the molten steel is prolonged. And the heat transmission of the molten steel in the tundish is more uniform. And moreover, the uniform molten steel flowing is beneficial to keeping the water gap unobstructed, and the water gap is prevented from being blocked by inclusions or cold steel in the molten steel.

The utility model discloses a roller type electromagnetic stirring device with a braking function, the roller type electromagnetic stirring device comprises a traveling wave roller, a braking roller and connecting seats, the two ends of the braking roller are respectively connected with the first end of the traveling wave roller through the connecting seats, the traveling wave roller comprises a main shaft, a traveling wave coil and a roller sleeve, the traveling wave coil is wound on the main shaft, and the roller sleeve is sleeved on the main shaft. The traveling wave coil generates a traveling wave magnetic field after being electrified; the brake roller comprises an outer cylinder, an iron core, an arc-shaped coaming and end covers, two ends of the arc-shaped coaming are hermetically connected with the end covers to form a hollow cylinder, the iron core is fixedly mounted in the hollow cylinder and is perpendicular to the outer cylinder, the cross section of the iron core is waist-shaped, a brake coil is wound on the iron core, and the brake coil generates a brake magnetic field perpendicular to the traveling wave magnetic field after being electrified. The traveling wave rollers generate transverse thrust to stir an unsolidified liquid core in a casting blank, the braking rollers generate longitudinal braking force to buffer overlapped impact of molten steel circulation formed by the transverse thrust of the traveling wave rollers on the two sides, sufficient mixing of molten steel and floating of inclusions are promoted, and slag entrapment is prevented.

The invention relates to a current control method for a continuous casting blank stirrer, and the method comprises the steps: setting control parameters of a variable-frequency controller in an electromagnetic stirrer, enabling an actual current to rise to a target current value, controlling the current to be increased to a current oscillation upper limit value at a certain rate, and then enabling the current to be reduced to a current oscillation lower limit value at a certain rate, and the circulation is repeated, so that the continuous casting electromagnetic stirring current is changed in a periodic sinusoidal waveform. The electromagnetic stirring current is controlled to change in a periodic sinusoidal waveform, so that the carbon segregation of the casting blank is improved, the carbon segregation range of the casting blank is reduced, the internal components of the casting blank are more uniform, and the performance of the casting blank is improved.

The invention provides a method for improving homogenization of a bearing steel casting blank, belongs to the technical field of steel smelting processes, and solves the technical problems that in the continuous casting process of bearing steel, large-size compounds are easily formed due to high carbon and high chromium content, and micro segregation regulation and control of the bearing steel are difficult to solve by traditional electromagnetic stirring and soft reduction process parameters. According to the method for improving the homogenization of the bearing steel casting blank through soft reduction and tail end electromagnetic stirring coupling, a bearing steel continuous casting solidification mathematical model is established and corrected, and pouring condition technological parameters are input to provide basic data and boundary conditions for establishing the bearing steel continuous casting solidification heat transfer mathematical model; the method is applied to soft reduction process parameter design and is matched with adjustment of the tail end electromagnetic stirring position, the soft reduction technology and tail end electromagnetic stirring are coupled to be implemented, the solid fraction coupling rule between soft reduction and tail end electromagnetic stirring is determined, the homogeneity of a casting blank is jointly improved from the two dimensions of solidification structure and solute distribution, and center segregation is improved; and the structure uniformity is improved.

The invention provides a magnesium-lithium alloy and a semi-solid thixotropic die-casting preparation method of the magnesium-lithium alloy. The magnesium-lithium alloy comprises the following components in percentage by mass: 5-14% of Li, 2-9% of Al, 1-3% of Zn, 1-5% of Ca, 0.3-3% of RE and the balance of Mg. The semi-solid thixotropic die-casting preparation method of the magnesium-lithium alloy comprises the steps that S1, burdening and drying are conducted according to the preset mass percent, vacuum melting is conducted in the protective gas atmosphere, and molten metal is obtained and cast into a magnesium-lithium alloy cast ingot; performing extrusion deformation on the magnesium-lithium alloy ingot, and cutting to prepare millimeter-scale long rod-shaped magnesium-lithium alloy particles; s2, the magnesium-lithium alloy particles obtained in the S1 are heated to the solidus temperature Ts or above, electromagnetic stirring is conducted, and semi-solid slurry is prepared; and S3, the semi-solid slurry is injected into a die-casting die, a die cavity is filled with the slurry by applying pressure, die opening and part taking are conducted after pressure maintaining, and the ultra-light high-strength semi-solid thixotropic die-casting magnesium-lithium alloy casting is obtained.

The invention discloses a dynamic control method and system for electromagnetic stirring of a crystallizer, and belongs to the technical field of metallurgical automation. The method aims at solving the problems that in the prior art, electromagnetic stirring parameters are fixed and cannot adapt to dynamically-changing continuous casting working conditions, so that low-speed stirring is insufficient, high-speed stirring is too strong, energy consumption is high, and casting blank quality is not stable. The method comprises the steps that actual process parameters such as the slab width, the casting speed and the water gap immersion depth in the continuous casting process are obtained in real time; on the basis of the parameters, addressing is carried out in a preset database in which the mapping relation between the process parameter combination and the current value is stored; according to the addressing result, a target electromagnetic stirring current value accurately matched with the current working condition is determined; and finally, controlling the current output of the electromagnetic stirring device based on the target value. By dynamically adjusting the stirring strength, intelligent adaptation to different working conditions is achieved, the casting blank quality and the production stability are remarkably improved, and energy consumption is effectively reduced.

The invention belongs to the technical field of integrated die casting, and relates to an integrated die casting forming method and system based on multi-magnetic-field coupling. The method comprises the steps that S1, metal raw materials are subjected to smelting, degassing modification and deslagging standing, and a metal melt is obtained; s2, in the inert gas environment, electromagnetic stirring is conducted on the metal melt; s3, the mold is subjected to mold heating, heat preservation and pressure maintaining, vacuumizing and release agent spraying; s4, the metal melt is pressed into a mold cavity for mold filling and solidification, a coupling magnetic field is applied to the metal melt, and an integrated die casting is obtained; wherein the coupling magnetic field covers a mold cavity and is used for improving the flowability of a metal melt during mold filling, inhibiting turbulent flow and refining the structure of the metal melt after solidification; the coupling magnetic field comprises a direct-current magnetic field and a pulsed magnetic field, the direct-current magnetic field penetrates through the metal melt from bottom to top, and the pulsed magnetic field penetrates through the metal melt from the side of the mold cavity. By means of the method, the high-quality integrated die casting can be manufactured.

The invention provides a method for preparing a copper ingot through waste copper refining, and belongs to the field of waste copper refining. The method comprises the following steps: sorting, crushing and drying a waste copper raw material to obtain a pretreated copper material; feeding the pretreated copper material into a cored power frequency induction furnace for melting; after the pretreated copper material is completely molten, adding a slag removing agent into the melt, then lowering the voltage, and salvaging slag after heat preservation; a magnetic refining agent is added into the melt obtained after slag fishing, stirring is carried out to adsorb impurity elements in the melt, then heat preservation and standing are carried out, and the magnetic refining agent is recycled; the refined melt is subjected to electromagnetic stirring and ultrasonic wave cooperative treatment, so that hydrogen and oxygen gas is deeply removed, and components are homogenized; and a slag conglomeration agent is added into the purified melt, stirring is conducted, slag is fished out after heat preservation, and casting is conducted to form an ingot. Therefore, deep and efficient removal of various types and trace harmful impurities (especially As, Pb, Sb and the like) in the waste copper is synergistically realized, and the metallurgical quality of final copper ingots is synchronously improved.

The invention provides a round billet continuous casting machine and multi-stage multi-mode electromagnetic stirring device matching method, and belongs to the technical field of metallurgy continuous casting, and the method comprises the steps that an electromagnetic stirrer in a crystallizer area applies a rotating magnetic field in the initial solidification stage, and the forming quality of an initial solidification shell is optimized; an electromagnetic stirrer in the secondary cooling area utilizes a traveling wave magnetic field to continuously regulate and control the solidification process of the core part of the casting blank; the feeding effect of a final solidification section is remarkably improved through the action of a high-intensity magnetic field by an electromagnetic stirrer in a solidification tail end area, and multiple matching modes are produced to be matched with existing continuous casting processes of different steel grades according to the characteristics of the steel grades, the throwing direction of each area and the type of the electromagnetic stirrer. And then through linkage of the multi-stage multi-mode electromagnetic stirring device and cooperative control over continuous casting process parameters, the equiaxed crystal area of the casting blank is enlarged, segregation is reduced, the internal quality of the casting blank is improved, and the density, uniformity and mechanical performance of the casting blank are improved.

The invention relates to an automatic control method for electromagnetic stirring parameters of a slab continuous casting crystallizer, which comprises the following steps of: 1, selecting a proper water gap immersion depth according to the condition of a continuous casting production field, 2, networking to obtain technological parameters such as a casting blank section, a casting speed, the water gap immersion depth and an argon blowing flow, and 3, automatically controlling and calculating the electromagnetic stirring parameters. The method comprises the following steps: step 1, calculating the most preferential stirring parameter under the current working condition through table look-up and interpolation calculation, step 4, outputting an electromagnetic stirring current parameter, step 5, executing the output electromagnetic stirring parameter, step 6, tracking the quality of a continuous casting slab product, repeating the steps 1-6 at regular time, and repeating the steps 2-6 under the condition that the step 1 is not changed. According to the scheme, casting blank surface defects are effectively removed, and the product quality is improved. After the optimized method is adopted, the occurrence rate of longitudinal cracks on the surface of the steel grade is reduced to 1.96% from 4.73%, and the defect rate of the steel grade is reduced to 3.93% from 8.41%.

The invention discloses a zirconium alloy fuel rod end plug composite welding method and a zirconium alloy fuel rod, and belongs to the field of welding. The zirconium alloy fuel rod end plug composite welding method comprises the following steps that a zirconium alloy end plug and a zirconium alloy fuel rod cladding are spliced together and fixed, and an inert gas environment is provided after vacuumizing; firstly, a zirconium alloy end plug and a zirconium alloy fuel rod cladding are subjected to TIG welding, and meanwhile ultrasonic stirring and electromagnetic stirring are provided; then, TIG welding is conducted on an inflation hole of the zirconium alloy end plug, and ultrasonic stirring and electromagnetic stirring are provided at the same time; and after welding is completed, a welding area is subjected to polishing and quality detection. According to the method, air holes in the zirconium alloy welding area can be effectively eliminated, uniform distribution of structures and components is promoted, and the welding quality and the corrosion resistance of the welding area are improved.

The invention belongs to the field of ferrous metallurgy, and particularly relates to a method for improving the quality of a continuous casting billet through ultrasonic waves. According to the method, a multi-directional focused ultrasonic field and solidification front edge dynamic regulation and control combined mode is adopted, and electromagnetic stirring phase difference control and cooperative control of a secondary cooling section (fan-shaped section) auxiliary ultrasonic vibrator are combined at the same time. Wherein the composite action mode of the longitudinal standing wave field and the transverse traveling wave field of the multidirectional focused ultrasonic wave field and the solidification front edge dynamic regulation and control mode act on the casting blank, so that the equiaxed crystal rate can be remarkably increased, and the combination of ultrasonic waves and electromagnetic stirring is beneficial to reducing the segregation degree of the casting blank; and the addition of nano aluminum oxide and magnesium oxide mixed particles in the casting powder is beneficial to improving sound wave conduction so as to reduce subcutaneous bubbles. The isometric crystal rate of the finally obtained continuous casting billet is increased to 30%-55%; the center segregation index of the finally obtained continuous casting billet is reduced to 1.05 or below; and the number of subcutaneous bubbles per square meter is less than 0.5.

The invention discloses a molten steel segregation prediction method and related equipment, and relates to the technical field of continuous casting, and the method comprises the following steps: obtaining process parameter data of electromagnetic stirring in a continuous casting process and corresponding molten steel segregation data; preprocessing the process parameter data and the molten steel segregation data to obtain a training data set for model training and a test data set for model verification; adopting a grey wolf algorithm to optimize hyper-parameters of the random forest model to obtain an optimized random forest model; training the optimized random forest model by using the training data set, and verifying the prediction performance of the optimized random forest model through the test data set; on the basis of the trained and verified optimized random forest model, real-time process parameter data are input, and a prediction result of the molten steel segregation degree is output; and optimizing and adjusting process parameter data of electromagnetic stirring according to the prediction result.

An electromagnetic stirring low-pressure casting pouring system (100) comprises a flask, a sprue (110), a runner (130), a mold cavity (150) and a riser (170) being formed in a core inside the flask, wherein the runner is arranged at a top end of the sprue and is in communication with the sprue, the runner is in communication with the mold cavity, the riser is in communication with the mold cavity, overflow ladles (190) are arranged on two sides of or around the sprue, and top ends of the overflow ladles are in communication with the top of the sprue and are located below the runner, such that molten metal in the sprue overflows to the overflow ladles during pouring, and sequentially flows to the runner, the mold cavity and the riser after the overflow ladles are filled. Also provided is electromagnetic stirring low-pressure casting pouring equipment comprising the pouring system. By means of the present electromagnetic stirring low-pressure casting pouring system, the additionally designed overflow ladles enable the collection of the initial molten metal, which contains a number of impurities, and provide effective filtration of the impurity-laden molten metal, thereby further ensuring the quality and properties of the casting.

An electromagnetic flow control method for reducing inclusions in a small-size cast billet. During continuous casting of the small-size cast billet, an electromagnetic stirring device having a Z-direction electromagnetic force is provided at a mold (3) and is capable of controlling the flow of molten steel in the mold, and carrying out Z-direction acceleration on a peripheral region of the molten steel while promoting circumferential rotational stirring of the molten steel in the mold. The method can reduce the impingement depth of the molten steel from a submerged entry nozzle in the mold, thereby having positive effects on promoting the flotation of the inclusions and improving the quality of the cast billet.

The utility model belongs to the field of structure and function integrated magnesium-based materials, and particularly relates to a short-process casting device, an aluminum-containing magnesium-based material and a casting method and application of the aluminum-containing magnesium-based material. According to the device, firstly, a SiC / Al pre-dispersion bar is prepared, then magnesium liquid pouring, pre-dispersion extrusion material melting and external field auxiliary layer-by-layer rapid solidification integrated treatment is carried out, under the ultrasonic cavitation effect, the electromagnetic stirring effect and the effect of a water cooling mold, Al and SiC are rapidly and evenly distributed, meanwhile, dispersed SiC particles rapidly enter a pasty area, and finally, the Al and the SiC particles are evenly dispersed. The method realizes layer-by-layer rapid solidification, effectively solves the problems of agglomeration caused by lack of external field assistance in the solidification process in the prior art and agglomeration of particles pushed to the grain boundary by matrix grains due to slow solidification speed, and in order to prevent melt oxidation, protective gas is distributed in the water cooling mold, and gas protection is performed on the surface of the melt in the whole process.

The invention discloses a production method for improving cleanliness of a wear-resistant steel casting blank, and relates to the technical field of metal material smelting and continuous casting. The method comprises the following steps: optimizing electric arc furnace smelting, and reducing the oxygen content of molten steel by adopting a specific deoxidation system; a double-slag method is adopted in the LF refining stage, the size of inclusions is reduced through Ca treatment and rare earth denaturation, and the plasticity of the inclusions is improved; the vacuum degree and the degassing time are controlled in the RH degassing process, and the gas content in the molten steel is further reduced; and finally, an optimized protective casting process is adopted in the continuous casting process, a flow field is optimized in combination with electromagnetic stirring (EMS), and formation of secondary inclusions is reduced. By means of the method, the total amount of inclusions of the wear-resistant steel casting blank can be reduced by 30%-50%, the oxygen content is reduced to 0.0010% or below, the cleanliness of the casting blank is remarkably improved, and the comprehensive performance of the wear-resistant steel is improved. The method is stable in process and suitable for industrial production.

A method for efficiently recovering an iron-containing phase in steel slag belongs to the technical field of metallurgical solid waste resource utilization, and comprises the following steps: mixing the steel slag and a modifier, adding the mixture into a crucible, heating, and melting under the action of a protective atmosphere to obtain molten steel slag; the temperature of a furnace body is controlled, an electromagnetic stirring device is started, oxygen is injected into the molten steel slag, when the viscosity is remarkably reduced, oxygen injection is maintained, heat preservation is continued after the temperature of the furnace body is reduced, and ferromagnetic ore phase grains gradually grow up; when the viscosity change curve is no longer obviously reduced and tends to be stable, CO2 is used as a carrier, high-temperature water vapor is blown into the molten slag, and solid oxidized steel slag is obtained after the temperature of the steel slag is reduced to room temperature; the solid oxidized steel slag is subjected to crushing and magnetic separation to obtain a strongly magnetic spinel ore phase and other weakly magnetic silicate ore phases. The method has the advantages of simple control method, simultaneous regulation and control of size and distribution, low energy consumption, no pollution and the like, can effectively treat the steel slag on a large scale, and is beneficial to industrial production.

The invention relates to a calculation method for predicting the solidification process of a continuous casting billet, and belongs to the technical field of continuous casting methods in the metallurgical industry. According to the technical scheme, a solidification process prediction model is established to predict changes of the temperature and the solid fraction in the casting blank solidification process; the influence of segregation on the solidification process is considered in model building, the concentration of C changes along with the thickness change of a blank shell, the initial value of a casting blank component is a tundish sampling detection value, and the end point value is a casting blank center point detection value; performing casting blank external correction, measuring the surface temperature of the casting blank, and correcting the solidification process prediction model through comparison between the temperature measurement value of the same position and calculation; multi-point correction is conducted in the casting blank, the final stirring strength is increased to enable a white bright band to appear on the cross section of the casting blank, the final stirring position and the distance from the white bright band to the edge are measured, large-rolling-reduction internal crack position measurement is conducted, and the solidification process prediction model is corrected according to the measurement result. The method has the beneficial effects that reasonable optimization of secondary cooling water distribution, tail end electromagnetic stirring and soft reduction process parameters can be accurately guided, and the internal quality of steel is improved.

The invention relates to an arc-shaped continuous casting space-time electromagnetic stirring device and method.The electromagnetic stirring device comprises a foot roller, a secondary cooling area, a solidification tail end and a plurality of electromagnetic stirring assemblies; the electromagnetic stirring assembly comprises a coil, an axial magnet yoke and a radial magnet yoke; the axial magnet yoke is fixedly mounted on the back of the radial magnet yoke, so that the electromagnetic stirring assemblies mounted in the secondary cooling area are connected in series; alternating current is applied to each coil, induced magnetic lines of force flow through the radial magnet yokes and the axial magnet yokes, a superimposed magnetic field moving in the radial direction and the axial direction is generated, the superimposed magnetic field interacts with the induced current to form spirally upward electromagnetic force, and molten metal is driven to move spirally. A flow field and a temperature field in a casting blank are improved, a stirring area is enlarged, and center porosity, shrinkage cavities and segregation are reduced. Compared with the prior art, the device has the advantages of integration of multiple functions, enlargement of a stirring area, flexible and adjustable parameters, defect control, high universality and the like.

The invention belongs to the technical field of chemical production, and particularly relates to extraction equipment and method for hydrogen peroxide production, the extraction equipment comprises an extraction container, inverted motors are symmetrically arranged on the two sides of the outer surface of the extraction container through sleeve shells, and the outer surfaces of the inverted motors are fixedly connected with side suspension frames; the extraction container comprises a containing cylinder; the torsion base is arranged at the bottom of the inner wall of the accommodating cylinder; the stirring component is arranged at the axis of the top of the torsion base. According to the device, the torsion base at the bottom of the containing cylinder can be improved to replace an electromagnetic stirrer to stir a solution from inside to outside, the rotating chassis and the packaging shell synchronously rotate, so that the packaging shell cannot abrade the rotating chassis during rotation, the side edge of the rotating chassis can be separated from the inner wall of the containing cylinder, and the rotating chassis is prevented from being abraded during rotation. Therefore, even if the rotating chassis is abraded with the inner wall of the accommodating cylinder, the separated impurities cannot enter the solution at the upper part, so that the problem that the solution is polluted is solved.

The invention discloses a magnetic field intensity adjustable melt stirring system and a control method, and relates to the technical field of metallurgical casting, the magnetic field intensity adjustable melt stirring system comprises a crystallizer having an inner wall and an outer wall, a cooling cavity being formed between the inner wall and the outer wall; the shielding cover is fixedly arranged outside the crystallizer in a sleeving mode, and the magnetic field coil single-layer units are arranged on the inner wall of the shielding cover. The magnetic field intensity adjusting unit is electrically connected with each magnetic field coil single-layer unit and is used for dynamically adjusting the amplitude, the frequency and the waveform of the input current; the solidification interface detection module is arranged on the side wall of the crystallizer and used for detecting the melt solidification interface position in real time; the control module is in signal connection with the solidification interface detection module and the magnetic field intensity adjusting unit. The gradient magnetic field is accurately matched with the melt solidification process, dendritic crystal crushing is accurately strengthened, a traditional rotating assembly is replaced, energy loss generated by bearing friction, mechanical damping, mechanical vibration and the like is eliminated, the mechanical structure is simplified, the electromagnetic efficiency is improved, invalid power supply is avoided, and energy consumption is reduced.

The invention discloses a large-section vertical continuous casting cleanliness control method, which comprises the following control processes: 1) adopting a large-section vertical continuous casting machine, and ensuring that the floating time of inclusions in the solidification process of molten steel is 70-82 minutes; (2) when the first ladle of continuous casting is started and the tundish molten steel is in the range of 5-27 tons, slag absorbing agents are added into an impact area and a casting area at the same time; 100-300 kg of a slag absorbing agent is added into the impact area, and 300-500 kg of a slag absorbing agent is added into the casting area; (3) a modulating wave crystallizer electromagnetic stirring technology is adopted, the electromagnetic stirring current parameter ranges from 150 A to 600 A, and the frequency ranges from 1.0 HZ to 1.5 HZ; and 4) adopting a four-hole SEN immersion depth of 90-130mm. According to the method, secondary oxidation of molten steel in a continuous casting starting process can be effectively reduced, adhesion and aggregation of inclusions at a casting blank dendritic crystal solidification front edge are reduced, the inclusions are dispersed and distributed in the steel grade, and the final grades of the inclusions are as follows: the fineness A is less than or equal to 1.0 grade, the thickness A is less than or equal to 0.5 grade, the fineness B is less than or equal to 1.0 grade, the thickness B is less than or equal to 0.5 grade, the fineness C is less than or equal to 0.5 grade, the thickness C is less than or equal to 0.5 grade, the fineness D is less than or equal to 1.0 grade, and the thickness D is less than or equal to 0.5 grade.

The invention discloses a high-strength and high-conductivity nickel-loaded reduced graphene oxide reinforced copper-based composite material and a preparation method thereof, and belongs to the technical field of metal-based composite materials. The method comprises the following steps: firstly, preparing nickel-loaded reduced graphene oxide powder, then atomizing the nickel-loaded reduced graphene oxide powder, adding the atomized nickel-loaded reduced graphene oxide powder into a copper melt, and applying a synergistic effect of an alternating magnetic field and a direct-current electric field to realize enhanced phase directional alignment and interface strengthening; and finally, through homogenizing annealing, circular machining of'multi-pass cold drawing deformation and intermediate annealing ', rotary swaging and low-temperature aging treatment, the composite material which is uniform in structure and tight in interface bonding is obtained. The material has high strength and high conductivity, the tensile strength of the material is not lower than 700 MPa, the conductivity of the material is not lower than 80% IACS, and the material is suitable for high-requirement electrical materials and electronic interconnection and aerospace conductor components.

The invention relates to the technical field of steel production, in particular to a production process of 40CrH steel smelted by an electric furnace and used for automobile steering knuckles, and the steel comprises the following chemical components in percentage by weight: 0.385%-0.410% of C, 0.20%-0.32% of Si, 0.73%-0.77% of Mn, less than or equal to 0.022% of P, less than or equal to 0.020% of S, 1.02%-1.06% of Cr, 0.020%-0.040% of Alt, less than or equal to 0.04% of Mo, less than or equal to 0.0004% of B, less than or equal to 0.08% of Cu and the balance of Fe and impurities. The production process route comprises ecological electric furnace smelting, LF refining, RH vacuum degassing, continuous casting, heating and rolling. According to the method, the finished steel has narrow hardenability and good comprehensive performance by accurately controlling the chemical components of the steel and combining the technological means of electric furnace end point control, crystallizer and solidification end electromagnetic stirring, rolling temperature optimization and the like.