461 results about "Electromagnetic stirring" patented technology

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 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.

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 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.

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 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 utility model provides an aluminum alloy semi-continuous casting device which comprises a launder, a graphite ring, a crystallizer, an electromagnetic stirring unit, an ultrasonic vibration unit and a dummy bar head. The tail end of the launder is communicated with a cavity of the crystallizer so as to lead in aluminum alloy melt, and the graphite ring is arranged on the inner wall of a first water tank of the crystallizer; the dummy bar head is arranged below the graphite ring and moves up and down in the direction of the center axis of the crystallizer. The ultrasonic vibration unit extends into the cavity of the crystallizer to act on the aluminum alloy melt; the electromagnetic stirring unit comprises a plurality of electromagnetic generators and a plurality of second water tanks, the cross sections of the electromagnetic generators are annular, and each electromagnetic generator is arranged in the corresponding second water tank; a second water tank is arranged on the peripheral side of the first water tank of the crystallizer, and a plurality of second water tanks are sequentially arranged below the first water tank of the crystallizer. The action range of an external field in the aluminum alloy melt can be expanded to the maximum extent, the heat transfer efficiency is improved, and the probability of generation of hot cracks is reduced.

The invention relates to the technical field of secondary metal smelting, in particular to a metal smelting regeneration uniformity improving method and system based on electromagnetic stirring, and the method comprises the steps that temperature, density and flow field data in the smelting process are collected, a finite element is used for analyzing a multi-physical field coupling model, and a non-uniform area in a furnace is recognized; formulating a zone heating strategy, and adjusting the heating power and time sequence of each zone to realize uniform distribution of a temperature field; by adjusting electromagnetic stirring parameters, molten metal is driven to circularly flow, and density layering is eliminated; nozzles are uniformly arranged at the bottom of the smelting furnace for pulse injection of inert gas to homogenize smelted metal at the bottom of the smelting furnace; and by applying mechanical vibration, migration of impurities and bubbles is promoted, the metal mixing uniformity is further improved, and the quality of the regenerated metal is remarkably improved.

The invention discloses a rolling manufacturing method of low-decarburization medium-chromium round steel for a caterpillar track link and a product of the rolling manufacturing method, and belongs to the technical field of alloy steel rolling. The method comprises the following steps: smelting molten steel, wherein the molten steel comprises the following components in percentage by mass: 0.28-0.34% of C, 0.15-0.35% of Si, 0.50-0.85% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.80-1.10% of Cr, less than or equal to 0.30% of Ni, 0.10-0.30% of Mo, less than or equal to 0.30% of Cu, 0.010-0.060% of Al and the balance of Fe and impurities; lF refining, RH vacuum degassing (the time is longer than or equal to 20 min, and the hydrogen content is smaller than or equal to 1.5 ppm), electromagnetic stirring continuous casting (the superheat degree is 15-25 DEG C), slow cooling (longer than or equal to 12 h), segmented heating (the total time is shorter than or equal to 200 min, and the residual oxygen content is lt, 3%), multi-stage high-pressure water descaling (the pressure before finish rolling is 30-35 MPa) and hot continuous rolling (the compression ratio is larger than or equal to 6) are conducted. The total decarburized layer depth of the obtained round steel is smaller than or equal to 0.30 mm, and the round steel has high hardenability, excellent mechanical property and low surface defect rate and is suitable for heavy-load components such as a hydraulic excavator caterpillar track link.

The invention discloses a continuous casting production method of a medium carbon steel large round billet, which is characterized in that electromagnetic stirring is carried out in the following three solidification stages in the continuous casting process of the large round billet: (1) electromagnetic stirring is carried out at the middle lower part of a crystallizer, and the value range of magnetic field intensity distribution along the center line of the crystallizer is 0-10mT; (2) electromagnetic stirring is conducted at the position where the solidification rate of the casting blank ranges from 65% to 75%, and the value range of magnetic field intensity distribution ranges from 7 mT to 16 mT; and (3) electromagnetic stirring is conducted at the position where the solidification rate of the casting blank is 85%-90%, and the value range of magnetic field intensity distribution is 10-25 mT. The method acts on the casting blank in the appropriate solidification process, appropriate electromagnetic stirring force is applied, and macrosegregation of the large round blank is improved; the electromagnetic field is used for acting on three casting blanks in different solidification stages, on one hand, the flow field in the crystallizer can be improved, and the impact depth is reduced; and on the other hand, electromagnetic stirring is used in a casting flow area to reduce positive segregation of a CET area, the grain size of an equiaxed crystal area is refined, then the macrosegregation degree of a casting blank is reduced, and the carbon range is reduced.

The invention discloses a preparation method of a novel low-alloy steel solid welding wire. The preparation method comprises the following steps of S1, raw material smelting, S2, a hot working stage, S3, a cold working stage, S4, surface treatment and S5, quality detection. During raw material selection, C-Mn-Si is adopted as a basic alloy, the content of C is 0.06-0.12%, the content of Mn is 1.2-1.6%, then a Ti-B microalloy is added, the hardenability is improved, the O / N content is limited at the same time, then a two-stage refining process combining vacuum induction melting and electroslag remelting is adopted, the melting temperature, time and refining slag system components are regulated and controlled, and the hardness of the alloy is improved. The method comprises the following steps: preparing a copper plating solution through equipment, deeply removing harmful impurities such as S and P, promoting floating and size refinement of inclusions by applying an electromagnetic stirring technology, remarkably improving the purity of a metal matrix, thereby improving the purity of raw material smelting, proportioning the copper plating solution through the equipment, setting the parameters of the copper plating equipment to be 10-15A / dm in current density and 2-3mu m in plating thickness, and carrying out a copper plating process on a welding wire.

The invention discloses a method for efficiently removing iron from a regenerated Al-Si alloy, which is characterized in that by controlling the content of Si, the mass percent of the Si is in a range of 10.0-12.6%, the heat preservation temperature of iron removal is reduced, the sedimentation efficiency of an iron-rich phase is improved, the mass ratio of (Mn + Cr) / Fe is controlled to be 0.5-1.0, the proportion of components and the sedimentation temperature are optimized, and the iron removal efficiency is improved. And the iron removal efficiency and the production efficiency are further improved. Besides, secondary aluminum with high Fe content is added through a step-by-step method, an electromagnetic stirring system is combined, melting of the secondary aluminum with high content is effectively accelerated, the production efficiency is improved, the Al-Sr-RE composite alterant with a specific proportion is added, sedimentation of an iron-rich phase can be further accelerated, the iron removal rate and the production efficiency are improved, and a subsequent refining agent with a specific proportion is combined, so that the iron removal efficiency is improved. And castings or regenerated aluminum alloy ingots with few impurities and excellent mechanical properties are obtained, the balance of the iron removal rate and the production efficiency is achieved on the whole, and the comprehensive performance of the regenerated aluminum alloy is remarkably improved.

The multi-mode electromagnetic stirring device comprises a traveling wave magnetic field generator set, a rotating magnetic field generator and a shell assembly, and the traveling wave magnetic field generator set and the rotating magnetic field generator are arranged in the shell assembly in the axial direction. A multi-mode electromagnetic stirring device is arranged outside liquid metal needing to be stirred, alternating current in a certain form is supplied to a traveling wave magnetic field generator set in the multi-mode electromagnetic stirring device through an external power source, a traveling wave magnetic field can be formed in the multi-mode electromagnetic stirring device, and therefore axial force is generated on the liquid metal; alternating current in a certain form is supplied to a rotating magnetic field generator in the multi-mode electromagnetic stirring device, and a rotating magnetic field can be formed in the multi-mode electromagnetic stirring device, so that rotating force is generated on liquid metal; the traveling wave magnetic field generator group and the rotating magnetic field generator are respectively supplied with alternating current in a certain form through an external power supply, and a traveling wave magnetic field and a rotating magnetic field can be simultaneously generated in the multi-mode electromagnetic stirring device, so that spiral stirring force is generated on liquid metal.

The invention discloses a method for controlling longitudinal cracks of a bearing steel casting blank with a 150-square section, and belongs to the technical field of continuous casting of ferrous metallurgy. Five core processes are used for collaborative optimization: 1) the degree of superheat of molten steel is controlled to be 25-45 DEG C, and manual and continuous temperature measurement is adopted to ensure temperature accuracy; (2) full-process protective casting is carried out, the insertion depth of a submersed nozzle ranges from 110 mm to 125 mm, and the centering deviation is smaller than or equal to 1 mm; (3) crystallizer electromagnetic stirring (M-EMS) takes the magnetic induction intensity larger than or equal to 1000 Gs as the standard, the current is set to be 380-450 A, the frequency is set to be 5-7 Hz, and the forward and reverse rotation period is set; 4, vibration parameters are set according to the pulling speed, and the cooling water amount is synchronously controlled, 5, a composite flow field is formed through a water gap of four water outlet holes with the downward inclination angle of 45 degrees from the outer wall to the inner wall, and the longitudinal crack occurrence rate is reduced to 0.5%-1% from 8%-10%. The casting blank surface quality and component uniformity are both considered, and the method is suitable for large-scale industrial production of the high-carbon bearing steel.

The invention discloses a method for controlling the internal quality of a spring steel casting blank. In the continuous casting process, the pulling speed is controlled to be 0.45-0.55 m / min, the specific water flow is 0.09-0.13 / kg, the superheat degree of a tundish is controlled to be 18-25 DEG C through induction heating of the tundish, the total rolling reduction of a pressing device is controlled to be 25-35 mm, and 2-6 pulling-straightening rollers are put. According to the method, the tundish is heated through induction, and the internal quality of the spring steel is improved through combination of crystallizer electromagnetic stirring and tail end electromagnetic stirring processes and a light and heavy pressing process; according to the spring steel casting blank manufactured through the method, the center porosity is greatly improved, the center porosity is smaller than or equal to 0.5 level, the center shrinkage cavity is smaller than or equal to 0.5 level, the center crack is smaller than or equal to 0.5 level, and the number of inclusions is smaller than or equal to 218 / 100 mm < 2 > (larger than or equal to 6 micrometers).

This invention discloses a method for preparing a large round billet for continuous casting of forged cold-rolled roll sleeves, comprising: controlling the composition system, wherein the chemical composition of the raw material steel is: C: 0.65-0.75%, Si: 0.25-0.40%, Mn: 0.35-0.50%, P≤0.020%, S≤0.020%, Cr: 1.90-2.10%, Ni: 0.30-0.45%, Mo: 0.20-0.40%, V: 0.05-0.10%; and controlling the continuous casting process parameters, wherein the superheat is controlled within a certain range. The casting temperature is maintained between 15 and 35°C, the casting speed is kept stable at 0.24 ± 0.01 m / min, the crystallizer water flow is controlled at 3700 L / min, and the secondary cooling water flow in the crystallizer is controlled at 0.12 L / Kg. During continuous casting, a 200 A / 2.5 HZ electromagnetic stirring of the casting flow and a 500 A / 1.2 HZ strong end electromagnetic stirring are used. The heat treatment process parameters for the continuously cast round billets are controlled as follows: red-charging annealing of the continuously cast round billets, furnace charging temperature ≥ 400°C, heating rate ≤ 100°C / h, holding at 730°C for ≥ 15 h, furnace cooling to 400°C, and air cooling upon exiting the furnace. This invention ensures the hardness and wear resistance of the cold-rolled roll sleeves while improving toughness and machinability, avoiding surface cracking and internal cracking of the roll sleeves during the casting and forging processes, ultimately achieving high-efficiency production and long service life of the roll sleeves.

The invention discloses a production process of high-efficiency low-inclusion large-specification steel for a wind power main shaft bearing ring, and belongs to the technical field of steel for wind power bearings. According to the process, a CaO-SiO-AlO-MgO quaternary refining slag system is adopted, so that the inclusion adsorption efficiency and the slag system stability are improved; a crystallizer, a secondary cooling zone and tail end three-stage electromagnetic stirring are adopted, and the casting blank with the ultra-large specification of phi 800-1200 mm is adapted; eAF-CONARC short-process smelting is integrated, and energy consumption and residual element fluctuation are reduced; and a segmented slow cooling process is adopted, and hydrogen diffusion and stress release are enhanced. The casting blank produced through the method is compact in macrostructure (the center porosity is smaller than or equal to 1.0 grade), the non-metallic inclusion grade is smaller than or equal to 0.5 grade, the molten steel O is smaller than or equal to 0.0007%, the H is smaller than or equal to 0.00005%, the smelting period is shortened by 16.7%, the energy consumption per ton of steel is reduced by 13.3%, and the mechanical property and the hardening layer depth after hardening and tempering meet the requirements of the ultra-large-specification wind power main shaft bearing ring.

The invention provides an aluminum alloy low segregation melt treatment method, and relates to the technical field of material segregation processes. The method comprises the following steps: S1, raw material acceptance and pretreatment, and then raw material smelting and degassing; s2, adding a composite refiner; s3, carrying out electromagnetic stirring and ultrasonic cooperative treatment; s4, carrying out stepped solidification; s5, detecting the quality of the cast ingot, and shunting unqualified products; s6, performing ultrasonic-assisted hot working; s7, electromagnetic-ultrasonic synergistic heat treatment; and S8, post-treatment and finished product quality inspection. Wherein in the step S3, an electromagnetic field applying device is arranged on the periphery of the smelting furnace to carry out electromagnetic stirring on the melt, a plurality of ultrasonic transducers are arranged in the circumferential direction of the smelting furnace or a plurality of probes with the ultrasonic transducers are prepared, and ultrasonic waves are applied to the melt. Refiner adding, electromagnetic stirring and ultrasonic treatment are integrated in the melt stage, nucleation strengthening, melt homogenization and dendritic crystal pre-crushing are synchronously completed through control of a directional ultrasonic field and a graded magnetic field, the process efficiency is improved, and the segregation control effect is remarkable.

The invention discloses a preparation method of a multistage refined hypereutectic Al-Si alloy, and relates to the technical field of preparation of aluminum-silicon alloy materials. The preparation method specifically comprises the following steps that hypereutectic Al-Si alloy and two rare earth elements are evenly mixed, a mixed material is obtained, the mixed material is subjected to electromagnetic induction heating melting in an inert atmosphere, and a melt is formed; the melt is rapidly cooled to the cooling end point, and solid-liquid coexistence two phases with refined primary Si grains are obtained; the solid-liquid coexisting two phases are subjected to electromagnetic stirring, and alloy liquid with primary Si grains further refined is obtained; and the alloy liquid is placed in a cooling agent to be cooled, and the hypereutectic Al-Si alloy obtained after primary Si crystal grain three-stage refining is obtained. Through the three-stage synergistic effect of providing a nucleation core through rare earth synergism, crushing grains through electromagnetic stirring and inhibiting growth through rapid cooling, the refining effect is far better than the simple superposition of the grain refining effects of three processes, and the method has the characteristics of remarkable grain refining and short process.

The application provides a sampling device for tumor cell thoracoabdominal membrane metastasis detection, which comprises a liquid storage container, a sampling assembly, a sampling assembly and an electromagnetic stirring assembly. The electromagnetic stirring assembly comprises an electromagnetic stirrer arranged on the outer wall of the bottom of the liquid storage container and a magnetic core arranged on the inner wall of the bottom of the liquid storage container. When the electromagnetic stirring assembly works, the magnetic field force generated thereby can drive the sample liquid in the liquid storage container to be uniformly stirred. The sampling assembly and the sampling assembly are each provided with a control system (i.e. a flow controller and an electromagnetic valve). When the preset capacity is reached, the flow controller can control the electromagnetic valve to be automatically closed. The sample liquid is fully and uniformly stirred by the electromagnetic stirrer, and is accurately divided into multiple sampling tubes, so that the accuracy of the tumor cell thoracoabdominal membrane metastasis detection result and the processing efficiency are improved.

The invention provides an ultrahigh-strength 92-grade tire cord steel segregation and net carbon control method which comprises the following steps: (1) continuous casting cooling: molten steel meeting the chemical component requirements of 92-grade tire cord steel is continuously cast into a continuous casting billet, the continuous casting billet is cooled by adopting an aerial fog weak cooling process method, and the secondary cooling specific water flow is 0.20-0.40 L / kg; (2) electromagnetic stirring: adopting crystallizer electromagnetic stirring with high electromagnetic intensity and tail end electromagnetic stirring on the section of the continuous casting billet; (3) continuous casting pulling speed: casting a continuous casting blank at a low pulling speed; (4) continuous casting light and heavy reduction: carrying out large reduction and multi-rack continuous reduction on the section of the continuous casting billet; and (5) heating the continuous casting billet: increasing the heating temperature of the continuous casting billet to 1200 DEG C or above, and prolonging the heating time of the continuous casting billet to 180 minutes or above. The segregation index is reduced to 1.06 from the original 1.20, the qualified rate of wire rod net carbon is increased to 99% or above from the original 95%, and the wire breakage rate of customer processing is reduced to 2.5 times / ton from the original 4.5 times / ton.

The application discloses a kind of based on molten pool state feedback's titanium alloy laser welding pore control method and system, by design adjustable electromagnetic stirring power and frequency electromagnetic generating module connection magnetic field exerting component, establish the matching process parameter library of electromagnetic stirring and laser welding, cooperative adjustment infrared blue light composite laser welding process parameter, including infrared laser power, blue light laser power, welding speed and defocusing amount.Again using high-speed camera device carries infrared thermal imaging monitoring molten pool state, simultaneously construct real-time monitoring and feedback control system, to realize titanium alloy welding overall closed-loop control.Adopt the method of the application can realize the stirring of molten pool in laser welding process, make pore effectively escape, avoid the pore defect caused by gas not in time to escape under the condition that laser welding cooling speed is faster.Titanium alloy laser welding pore rate is reduced to 2% and below, compared with traditional laser welding method reduces more than 80%, significantly improves welding quality stability.