589 results about "Electromagnetic stirring" patented technology

The invention discloses an electromagnetic current coupling field assisted hybrid melting-brazing method for a laser-TIG arc and equipment. In addition to the use of the welding zone, an alternating magnetic field is added to control properties of plasma formed through ionization of laser, arc and a raw material metal, thereby improving the laser utilization rate. Under the electric field assisted comprehensive effect, the weld melting depth is increased, and the assistant effect on the melting bath of the liquid-state brazing filler metal for laser-arc melting-brazing is realized through electromagnetic stirring and excitation and enhancement, thereby promoting the orderly flow of the liquid-state brazing filler metal and the rupture, wetting, spreading and proliferation of the liquid-state brazing filler metal on the surface of the high metal material, improving the full mixing of the liquid-state brazing filler metal and the base metal formed by melting the low-melting-point metal material, improving the uniformity of the components of the brazed weld, stabilizing the welding process, reducing welding defects, increasing the welding speed, improving the weld formation, optimizing the structure and performance of the brazed weld, and improving the quality of the brazed joint. Moreover, the equipment has the advantages of simple structure, flexible application, low cost, good effect and easy realization.

The present invention relates to one kind of composite electromagnetic field build-up welding method, apparatus and expanded application, and is composite electromagnetic field controlled gas protected build-up welding method. The welding apparatus is provided with exciting power source, exciting device, auxiliary electric field device and water cooling system. The exciting device has electromagnetic stirring exciting coil and electromagnetic heat treatment exciting coil; and the auxiliary electric field device includes one pair of movable electrodes. Through electromagnetic stirring, electromagnetic heat treatment and the compound effect of auxiliary electric field and the welding torch, the present invention realizes the build-up welding of alloy material in high efficiency, high quality and low cost.

The invention discloses a process and equipment for preparing a nanoparticle-reinforced metal matrix composite material. The process comprises the following steps of: mixing reinforcing nanoparticles with matrix metals and a grain growth inhibitor in a stirring ball mill together, and then loading the mixture into a steel pipe; casting the mixture together with the matrix metals in a water cooling crystallizer or casting and forming the mixture together with a molten metal in a casting mould; and performing quick solidification and crystallization after electromagnetic stirring and ultrasonic vibration to ensure that the two phase materials achieve complete metallurgical bonding, wherein because of the electromagnetic stirring and the ultrasonic vibration, the two phase materials are mixed more uniformly, and all properties of the composite material can be further improved. by using the process and the equipment, a production process is simple, the cost is low, the efficiency is high, the product performance is high, the process is easy to control, the external dimensions of products are not limited by the process, and large-sized nanoparticle-reinforced metal matrix composite materials can be manufactured.

The invention discloses a preparation method of a graphene-reinforced copper-based composite and belongs to the field of preparation of high-strength and high-conductivity composites. The method comprises steps as follows: graphene, nano copper powder and cobalt powder in the required mass ratio are mixed in absolute ethyl alcohol, the mixture is physically dispersed under electromagnetic stirring, and then physically dispersed mixed slurry is added to a ball milling tank for mechanical ball milling; after evenly mixed slurry is centrifugally dried, obtained mixed powder is annealed and then subjected to hot-pressing SPS (spark plasma sintering) forming; an obtained block blank is annealed and then subjected to hot extrusion, and the graphene-reinforced copper-based composite is obtained. The graphene-reinforced copper-based composite prepared through the method has the good mechanical property, uniform structure and good heat and electricity conductivity.

The invention relates to a preparation method of a disulfide dot/nanosheet compound DNA electrochemical probe. The method concretely comprises the following steps: 1, carrying out ultrasonic peeling on transition metal disulfide powder, carrying out high-temperature electromagnetic stirring to prepare a transition metal disulfide quantum dot/nanosheet compound, and carrying out ultrasonic treatment on the compound in a thionine and ionic liquid dispersion liquid to prepare a thionine functionalized compound; 2, dispersing the compound prepared in step 1 in an organic solvent to prepare a suspension, dispensing the suspension on an electrode, and drying to obtain a compound modified electrode; and 3, carrying out electrochemical test on a three-electrode system formed by the electrode produced in step 2 in a buffer solution, injecting different concentrations of a DNA solution, testing, recording the change of the electrochemical signal of the electrode, and constructing a DNA electrochemical probe system. The probe has the advantages of high sensitivity, good stability, wide linear range and low detection limit, can be used in detection of DNA in serum, and has wide application prospect in biological analysis and clinic diagnosis fields.

The invention discloses a Ti-based powder preparing device and a Ti-based powder preparing method. The device comprises a vacuum chamber, a magnetic suspension melting furnace, an atomization power processing chamber and a screening system. During working, when the magnetic suspension melting furnace is energized with high frequency alternating current, a high frequency alternating magnetic field can be produced in space around a coil, and the high frequency alternating magnetic field causes induction vortex in furnace charge. The induction vortex and the external alternating magnetic field interact with each other to produce suspension force for the furnace charge, and the suspension force is balanced with the dead weight of the furnace charge so as to enable the furnace charge to suspend; meanwhile, a vortex circuit generates a great deal of heat to melt the furnace charge, and the molten mass is subjected to deslagging, degassing and purification under the fierce function of electromagnetic stirring. The purified molten mass can fall into a gas atomization chamber by virtue of controlling the magnetic field; under the functions of a supersonic speed high-pressure argon atomizer and a cooling device, the molten mass is atomized into spherical Ti-based powder with high degree of sphericity, oxygen content of less than 1800 ppm and nitrogen content of less than 300 ppm.

The invention relates to a quick variable temperature miniature thermostatic sample cell, which is made of metallic material, an opening is formed in the center of the metallic material and is used as a sample cavity, a light through hole is formed on a metallic shell along the center of the sample cavity, a transparent material is embedded in the light through hole, a Peltier temperature control element is glued on the non-light surface of the metallic material, a groove is arranged on the bottom of the metallic shell for laying aside a temperature sensor, the coat of the metal shell has a heat insulation outer frame, the center of a base connected with the bottom of the heat insulation outer frame is provided with a miniature motor, a small magnet is arranged at the edge of the leaf of a spiral leaf on the shaft of the motor, a stirring magneton is laid aside at the bottom in the sample cavity, the inner wall of the sample cavity and the outer faces of the sensor and the stirring magneton is carried on chemical inertia processing. The invention replaces the water heat conduction with the metal, and changes the system temperature with a thermo-element; the sensor directly observes the temperature of the sample, the heat conduction is speeded up by a miniature electromagnetic stirring system has accelerated; the invention is characterized in having small volume, accurate the temperature measurement, quick variable temperature, and good stability, etc, being able to be placed in analytical instrument such as spectrophotometer, etc., and realizing the quick variable temperature and the accurate thermostatic control of the temperature of the sample.

The invention discloses a method and a device for preparing a crack-free cladding layer through ultrasonic vibration-assisted laser cladding. Ultrasonic vibration aging is directly introduced into a molten pool micro-area, a direct cavitation effect, a mechanical effect and a heat effect of an ultrasonic wave are utilized for promoting the uniformity of a cladding layer stress field and the refining of grain tissues, and the generation of cracks is inhibited from the root; the ultrasonic wave can be directly acted on a molten pool, a promoting effect on temperature and stress distribution uniformity is higher than an overall vibration effect of a workpiece far away from the molten pool, and the three effects of the ultrasonic wave have a better stirring effect than that of an electromagnetic stirring elimination method, so that the new method has essential difference relative to previous methods, and has better superiority. By repeated experiments, an effect of refining the grain tissues can be achieved so as to prepare the crack-free cladding layer with a favorable surface appearance.

Vertical electromagnetic stirring is used to produce low shear, stress, turbulent and chaotic mixing of a liquid material or suspension in a container regardless of the volume or container geometry. Movement of a magnetic stir bar is controlled by multiple magnetic fields. The magnetic fields are produced by a series of sequentially or non-sequentially activated inductor coils which produce asymmetrical stirring dynamics and random motions of the stir bar, causing the liquid material to be gently and effectively mixed throughout the container. Moving the stir bar in random and irregular patterns during the stirring operation creates turbulent and chaotic mixing dynamics. The stir bars used for supporting vertical magnetic stirring are specifically designed to optimize the effectivity of the mixing process by maximizing the length of the stir bar to quickly and gently mix the materials.

The invention provides a continuous casting bloom soft press technology based on tail end electromagnetic stirring and belongs to the field of metal casting. The continuous casting bloom soft press technology based on the tail end electromagnetic stirring is characterized in that after a tail end electromagnetic stirring device is arranged on a second cooling area, a previous air cooling area is straightened. The thickness of a liquid core controlling the position of the stirring device occupies 30% to 55% of the thickness of a casting blank through a solidification heat transmission mathematical model. Stirring current of the tail end electromagnetic stirring device is 350A to 750A and stirring frequency is 3Hz to 8Hz. When soft press and straightening are conducted simultaneously, complete solidification of liquid phase among columnar crystals is guaranteed and meanwhile total press amount of a press intersection is controlled to be 10mm to 25mm, liquid steel superheat degree of a tundish is 20 DEG C to 30DEG C, dragging speed of a continuous casting machine is 0.35m/min to 0.75m/min, and therefore internal quality of a continuous casting bloom is remarkably improved and high quality rolled metal is guaranteed. Continuous casting bloom bearing steel manufactured through the technology is continuously manufactured for over 10 boilers, occurrence of internal cracks is avoided, a central organization is dense and even, the rate that a center contracting hole <=1.0 reaches 97.54%, center C segregation is controlled to be under 1.06 and thus the internal quality of the bearing steel is remarkably improved.

The invention discloses a continuous casting process for high-class high-quality chain steel. According to the continuous casting process, a method of process control is adopted, a large billet caster is adopted for continuous casting, the portion from a large ladle to a tundish and the portion from the tundish to a crystallizer are poured in a protecting mode, argon gas is filled in the tundish before pouring, the portion from the steel ladle to the tundish is poured in a protecting mode through a long nozzle argon seal, the portion from the tundish to the crystallizer is poured in a protecting mode through a high-quality whole internally-installed submerged nozzle, a high-quality current stabilizer is adopted in the tundish impact area, a covering agent is used in molten steel in the tundish, the temperature of the tundish is measured continuously, automatic water distribution is carried out in the crystallizer and for secondary cooling, and the crystallizer is stirred in an electromagnetic mode and pressed dynamically and slightly. According to the continuous casting process, the internal and external quality of a casting blank is good, no connection blanks and slag pits exist in the surface, and performance of cogging rolled steel meets requirements of users.

The invention discloses a preparation method of nitrogen-doped reducing graphene oxide aerogel. The method takes common natural graphite powder as a carbon source and comprises the steps of preparing graphite oxide, and performing ultrasonic stripping in deionized water to obtain graphene oxide hydrosol; adding a hexamethylenetetramine crystal into the graphene oxide hydrosol to form mixed liquid; heating the mixed liquid to 70-90 DEG C for 2-4 hours under an electromagnetic stirring condition in a fume cupboard to obtain the mixed liquid of nitrogen-doped reducing graphene oxide aerogel; standing the obtained mixed liquid of nitrogen-doped reducing graphene oxide aerogel for several hours; washing the mixed liquid of hydrogel by use of deionized water for several times; then performing freeze drying or supercritical drying to obtain foamed nitrogen-doped reducing graphene oxide aerogel. By adopting the method disclosed by the invention, the prepared aerogel has a relatively large specific surface area as well as a three-dimensional structure; with an excellent adsorption property, the aerogel can become an ideal water quality purifier, a catalyst carrier and an efficient composite material.

The invention relates to an electroslag casting device additionally provided with electromagnetic stirring and a method thereof. The electroslag casting device belongs to the technical field of special steel electroslag metallurgy and comprises a crystallizer, a crystallizer water jacket and an electromagnetic stirrer; an annular magnet is sleeved on the outer wall of the crystallizer and positioned at the middle-upper part of the crystallizer, a loop is wound on an iron core of the annular magnet, an electromagnetic stirrer water jacket is arranged at the periphery of the annular electromagnet, and the electromagnetic stirrer water jacket is communicated with the crystallizer water jacket; a melting consumable electrode forms molten steel drops which then enter a slag layer; the molten steel drops fall down in a spiral line way in the slag layer under the action of the rotary electromagnetic field and then enter a steel ingot liquid tank; the steel ingot liquid tank raises continuously and also enters into an effective magnetic field action region of the electromagnetic stirrer; and meanwhile, electric current in the molten steel is acted with the rotary magnetic field to produce the electromagnetic force which then drives the molten steel to rotate. The invention has simple equipment, and has the obvious functions of improving the surface quality, the subsurface quality and the solidifying tissue of a casting blank and the isometric crystal ratio, and lightening the internal defects, such as the center segregation, the center looseness, and the like.

The invention discloses 35MnB steel which comprises the following components in percentage by weight: 0.33-0.36 percent of C, 0.20-0.30 percent of Si, 1.20-1.40 percent of Mn, not more than 0.30 percent of Cr, not more than 0.025 percent of S, not more than 0.025 percent of P, not more than 0.20 percent of Ni, not more than 0.20 percent of Cu, 0.015-0.035 percent of Ti, 0.005-0.0030 percent of B, 0.015-0.035 percent of Al, not more than 20*10<-6> percent of [O] and not more than 35*10<-6> percent of [N], wherein the components are smelted in a rotary furnace, subsequently smelted in an LF ladle furnace, then subjected to RH vacuum degassing and finally cast continuously to obtain an ingot blank. The energy consumption cost for producing the type of steel is lowered fundamentally; loss of an element B of the 35MnB steel is reduced; the yield of ferroboron during a steel smelting process is increased; the stability of hardenability of the 35MnB steel can be improved; in addition, by adopting low superheat degree, electromagnetic stirring and a constant-temperature and constant-speed casting process, segregation of the elements such as C and Mn is alleviated, the components are more uniform and the fluctuation of the hardenability is alleviated.

The invention relates to a technical device for preparing nano powder modified and reinforced die steels. The preparation process comprises the following steps: pre-dispersing and mixing pretreated nano reinforced particles together with pre-dispersed iron powder in a stirring-type ball mill, preparing into dispersed prefabricated blocks, adding in steel ladle, dispersing the nanoparticles in a die steel matrix by a block dispersion method, enabling the nano particles to evenly disperse in the die steel matrix and metal wear resistant material matrix by utilizing an electromagnetic stirrer, and moulding by a casting method. The invention adopts nano particle modification process to improve the wettability of the nanoparticles and matrixes, obtain the die steels with evenly distributed nanoparticles by secondary dispersion and an electromagnetic stirring technology and enable the steels to be modified and reinforced. By adding nanoparticles with different materials, the modified die steel can have different properties so as to satisfy different requirements of service conditions; and by adjusting the addition amount of the nanoparticles and the volume fraction thereof, on the premise of ensuring the material impact roughness, the larger the nanoparticle volume fraction is, the higher the material wear resistance is. The nano powder modified and reinforced die steel in the invention has excellent mechanical performance, simple production process and low manufacture cost.

The invention provides a dynamic control method for a slab continuous casting electromagnetic stirrer, which includes: acquiring and processing field production process data by the aid of a primary continuous casting computer and a secondary continuous casting computer to obtain related numerical values of non-solidification rate of molten steel in a casting blank, mushy zone width and the like; substituting selected, set and measured data into a magnetic induction density B calculation formula to obtain corresponding frequency values or current density values; and adjusting and controlling the electromagnetic stirrer in real time according to the values. The dynamic control method can be used for continuously calculating the related data of the non-solidification rate of the casting blank, the mushy zone width and the like according to change of field process conditions, automatically adjusting electromagnetic stirring current and frequency, enabling electromagnetic stirring effects to be more stable, and meeting the requirements of various steel types on segregation, so that the casting blank has no defects of cracks, needle holes, bubbles, scab, inclusion and the like, the isometric crystal rate of the casting blank reaches 55%, and central segregation degree is blow C1.0.

The invention discloses a method for improving the central carbon segregation in tire cord steel. The method produces 80 grade tire cord steel by adopting technical processes of electric furnace primary melting, refining, bloom concasting, billet rolling and rolled steel wire rolling by the billet, adopts control measures on each process, ensures strong stirring in argon blowing on the steel ladle bottom in a tapping process and a carbureting process after tapping; and the carburetion is controlled to be between 0.4 and 0.6 percent. Strong stirring is turned to be soft stirring after 10 minutes, until refining accepts the steel ladle. Alloying and carburetion are performed in sequence in LF refining, before aim carbon is adjusted, the temperature is ensured to be higher than 1,525 DEG C. In the method, the superheat degree of continuous casting is at 15 to 35 DEG C, full protection casting is adopted, a crystallizer is used for electromagnetic stirring, and the concasting bloom adopts soft press, so that the central carbon segregation of the tire cord steel is greatly improved, the hot-rolled rolled steel wire segregation of a tire cord steel finished product is not higher than 0.5 grade, and the control requirement of a tire cord steel user on the central carbon segregation can be met.

The invention provides a full-automatic luminescent immunoassay system based on a micronano-magnetic bead electromagnetic transfer technique. The system includes a computer and a detection box. The detection box is a sealable lightproof box, and comprises a first motor, a second motor, a membrane rupture device, an electromagnetic stirring rod, a Teflon coating or a disposable plastic jacket, immunomagnetic beads, a sample pool, a temperature control device, a photoelectric conversion device, a bottom reading light path, a waste consumable material recovery area or ultrasonic cleaning equipment, a reagent bin consumable material and a consumable material adapter, a guide rail and an electromagnet. The system provided by the invention is based on a magnetic bead transfer method, simplifies the detection steps, integrates the detection module, avoids a complex liquid path system, saves the detection time while realizing full automation and miniaturization of the immunodetection system, and also lowers the system cost at the same time.

The invention relates to a method and device for removing heavy metals in industrial sewage by an electromagnetic stirring paddle. The method comprises the steps that the industrial sewage after the pretreatment is fully mixed with nano zero-valent iron, a part of the heavy metals in the industrial sewage is reduced by n ZVI, a part of the heavy metals is absorbed on the surface of the n ZVI, after a reaction, clean water and n ZVI are separated through an electromagnetic stirring paddle device, the n ZVI containing the heavy metals is absorbed by a magnetic field acting force sent by the electromagnetic stirring paddle after energized, so that the n ZVI can be fixed on the electromagnetic stirring paddle to be effectively separated. The change for physicochemical property of the industrial sewage during the removing process or after the removing can be reduced through physical separation. According to the invention, the operation is simple, the effect is remarkable, the heavy metals such as zinc, copper, nickel, cadmium, lead and the like which exist in sewage can be removed once, and then the heavy metals absorbing on the n ZVI are recycled and separated through the electromagnetic stirring paddle. The n ZVI technology which is utilized to treat the sewage polluted by the heavy metals has the characteristics of low cost, high treating efficiency and the like; and the electromagnetic stirring paddle device is used to recycle resources, so that the secondary pollution is prevented.

The invention discloses an electromagnetic excited TIG arc melting-brazing hybrid welding method and equipment. In addition to the use of the welding zone, an alternating magnetic field is added to control properties of a welding arc, and the assistant effect on the melting bath of the liquid-state brazing filler metal for arc melting-brazing is realized through electromagnetic stirring and excitation and enhancement, thereby promoting the orderly flow of the liquid-state brazing filler metal and the rupture, wetting, spreading and proliferation of the liquid-state brazing filler metal on the surface of the high metal material, improving the full mixing of the liquid-state brazing filler metal and the base metal formed by melting the low-melting-point metal material, improving the uniformity of the components of the brazed weld, reducing welding defects, increasing the welding speed, improving the weld formation, optimizing the structure and performance of the brazed weld, and improving the quality of the brazed joint. Moreover, the equipment has the advantages of simple structure, flexible application, low cost, good effect and easy realization.

The invention discloses a method and a device for performing electric magnetization resistance welding-braze welding compounding on dissimilar materials by assistance of an applied magnetic field. In the process of performing resistance welding-braze welding on the dissimilar metal material, a liquid solder is subjected to auxiliary electromagnetic stirring and ordered control, and the molten liquid solder is subjected to the reinforced booster action of electromagnetic stirring and electric magnetization by using an external applied alternating magnetic field which is generated by a magnet exciting coil in a welding area so as to promote directional flow of the liquid solder, and rupture of membranes, wetting, spreading and diffusion of the liquid solder on the surface of the metal material with a higher melting point, promote the liquid solder and a base metal which is molten by the metal material with a lower melting point to be mixed fully, promote interdiffusion of elements and compositions between the solder and the base metal and alloying between the two, improve uniformity of compositions of a soldered seam, reduce the weld defects, optimize the texture and the performance of the soldered seam, and improve the resistance soldered joint; and the device has the advantages of simple structure, flexible application, lower cost, good effect, and easy implementation.

The invention discloses a continuous casting method for improving a central shrinkage cavity of a small high-carbon steel square billet. According to the continuous casting method for improving the central shrinkage cavity of the small high-carbon steel square billet, the degree of superheat, the amount of blown argon of a submersed nozzle and full-protection casting are controlled, the cooling specific water flow for secondary cooling and casting speed are adjusted, and soft reduction of the final stage of electromagnetic stirring and solidification of each crystallizer is carried out. The specific technological parameters are that the amount of blown argon of the submersed nozzle is controlled to be 15-20L/min under the condition that the full-protection casting is adopted, the average casting speed of a casting blank corresponding to each crystallizer is 2.6-3.0m/min, the cooling specific water flow of cooling water in the secondary cooling section of each crystallizer is 0.8-1.2L/kg, and aerosol cooling is carried out; casting with the low degree of superheat is adopted in the whole process, the degree of superheat is 20-40 DEC C, and soft reduction of the final stage of the crystallizer electromagnetic stirring under the condition of 460-480 A and 5-7Hz and solidification under the 0.4-4.5m condition is adopted. The continuous casting method for improving the central shrinkage cavity of the small high-carbon steel square billet has the advantages that the flow of the inlet gas and the specific water flow can be accurately controlled, cost is reduced, and products meeting all specifications are produced through adjustment of all parameters.

A method of producing on-demand, semi-solid material for a casting process includes the steps of first heating a metal alloy until it reaches a molten state and maintaining that molten state within a desired temperature range. The next step is to ladle out a portion of the molten alloy and transfer it into a processing vessel. In one arrangement the vessel is configured with its own cooling arrangement so as to begin the solidification process for the molten alloy. In another embodiment, a thermal jacket is used to facilitate the cooling of the vessel and accordingly the cooling of the molten alloy. The next step is to apply an electromagnetic field to the molten alloy in order to create a stirring action which results in a desired flow pattern of the molten alloy within the vessel. The electromagnetic stirring begins as soon as the molten alloy is placed in the vessel and continues while the cooling continues in order to create a slurry billet of the desired metallurgical composition. The final step is to discharge the slurry billet from the vessel directly into a shot sleeve of a casting machine. The apparatus related to the described method includes a vessel which is constructed and arranged for receipt of the molten alloy. A robotic arm is provided in one embodiment for moving the vessel into a stator and then from the stator to the discharge location. In another embodiment, pneumatic cylinders are used in cooperation with structural linkages to effect movement of the vessel first into the stator and then from the stator to the discharge location. Suitable cooling arrangements for the vessel include cooling lines within the vessel, the passage of cooling air between the stator and the vessel, and the use of a thermal jacket.

The invention discloses a method for producing high-purity upward oxygen-free copper rods, which comprises the following steps: uniformly adding copper plates into a melting furnace in batches during melting of copper materials; adopting a Cu-RE intermediate alloy rod to continuously add single rare earth element or mischmetal element, realizing electromagnetic stirring in the melting furnace through induction heating coils, and making the rare earth element uniformly distributed in molten copper; and arranging a ceramic filtration baffle plate on the front of a sluice between the melting furnace and a heat-insulating furnace, making the ceramic filtration baffle plate completely cover the sluice, preventing rare earth oxide from being rolled into upward oxygen-free copper rods, and obtaining the high-purity upward oxygen-free copper rods. The method has the advantages of simple production technique, stable production process, less residual oxide inclusion formed by the rare earth element, good purification effect of the copper materials, and good product quality.

The invention discloses a slab continuous casting crystallizer flow field control method. The slab continuous casting crystallizer flow field control method comprises the following steps that electromagnetic stirring devices and electromagnetic braking devices are used for controlling a slab continuous casting crystallizer flow field, the electromagnetic stirring devices are configured at the upper parts of the two sides of a crystallizer wide surface, the electromagnetic braking devices are configured at the lower parts of the two sides of the crystallizer wide surface, and the electromagnetic stirring devices at the upper parts and the electromagnetic braking devices at the lower parts are mutually independent; the electromagnetic stirring devices at the upper parts are installed betweena space above the upper edge of the outlet of a water gap, and a meniscus surface, and the electromagnetic braking devices at the lower parts adopt regional braking, are located at the positions, below the outlet of the water gap, of the two sides of the outlet of the water gap, and act on an area, where water gap outflow streams flow through, between the water gap and a crystallizer narrow surface; and the electromagnetic stirring devices at the upper parts and the electromagnetic braking devices at the lower parts are correspondingly powered through two sets of power supplies, and correspondingly and independently control the current intensity. The electromagnetic stirring devices at the upper parts adopt a traveling wave magnetic field mode, and correspondingly drive liquid steel to make relative horizontal motion in magnetic fields on the two sides of the crystallizer wide surface.

The invention relates to a martensitic stainless steel rectangular billet continuous casting method, which includes the following successive steps of: I. in a refining furnace, conducting adjustment with high carbon ferromanganese or high carbon ferrochrome, and controlling the content of [S] at less than or equal to 0.005% and the content of [N] at less than or equal to 0.018% in steel before continuous casting; II. controlling the superheat at 20-40DEG C, keeping an immersion nozzle insertion depth at 100-130mm, controlling a pulling speed at 0.75-1.15m/min, and maintaining a secondary cooling specific water flowrate at 0.29-0.32L/Kg; III. using M+F-EMS combined electromagnetic stirring, controlling the frequency at 3-5Hz and the M-EMS current intensity at 400-550A, and keeping the current intensity of F-EMS respectively at: 300-400A for 1Cr13, 450-550A for 2Cr13, 500-600A for 3Cr13, and 550-650A for 4Cr13; IV. maintaining the alkalinity of crystallizer protection slag at 0.90-1.05, the melting point at 1110-1130DEG C, and the viscosity at 0.1-0.13Pa.s (1300DEG C); and V. carrying out casting to obtain a continuous casting billet. The rectangular continuous casting billet casted by the method provided in the invention has no surface crack, and has surface dents less than 1.0mm.

The invention belongs to the technical field of corrosion and prevention, and in particular relates to a casting method of an aluminum alloy sacrificial anode. The casting method comprises the following steps: adding basic electrolytic molten aluminum to a resistance furnace; then adding a zinc ingot to obtain molten aluminum alloy; performing jet refining on the molten aluminum alloy by adopting an argon located refining agent; charging argon to refined aluminum alloy melt to degas; drossing oxidizing scum on the surface of the aluminum alloy melt through a drossing tool; adding a low melting point metallic element to drossed aluminum alloy melt; electromagnetically agitating the melt after pressing the low melting point metal; carrying out ceramic filtering; pouring and casting the aluminum alloy melt to a preheated iron anode mould at an even casting speed under the temperature of 700 to 740 DEG C until the mould is full of the aluminum alloy melt; and moving the aluminum alloy melt out of the mould after cooling, solidifying and molding, so as to obtain the aluminum alloy sacrificial anode. The casting method has the characteristics of being short in smelting time, small in loss of iron scale, high in degassing and purifying performances, and low in smelting cost.

The invention relates to metal purification, and particularly relates to a method for directional solidification extraction of ultra-high-purity aluminum under electromagnetic agitation. The method comprises the following steps: cleaning and baking the surface of to-be-purified refined aluminum, and then loading the to-be-purified refined aluminum into a totally closed furnace jacket with a high-purity graphite crucible to form a furnace pipe; arranging the furnace pipe into an electromagnetic agitation heating furnace; firstly, vacuumizing the furnace pipe by using a vacuum pump, and introducing argon into a standard atmospheric pressure value; heating the furnace pipe, and simultaneously moving an electromagnetic stirring device to the lower part of the furnace body; stirring molten aluminum which is firstly molten until the original aluminum is completely molten by matching with a heating system; pulling out the furnace pipe from an electromagnetic stirring furnace by using a lifting device at a constant speed, simultaneously moving the electromagnetic stirring device to the front edge of a solid-liquid interface of the molten aluminum; carrying out axial flow agitation on the molten aluminum at the front edge of the solid-liquid surface, and simultaneously cooling the furnace pipe part which is pulled out of the furnace body by using a cooling device arranged at the position of a fire hole; stopping crystallizing after 4-5 hours, wherein 2-3cm part of the upper end of the product aluminum ingot is cut off, the lower end is cut off by being15-20% of the original weight, and the remaining part is over 5N of product.

The invention discloses a dynamic control method and device for an electromagnetic stirring position at a solidification end in continuous casting of steel, and belongs to the field of iron and steel metallurgy continuous casting production control. A continuous casting dynamic tracking model is established by adopting a double linked list comprising continuous casting tracking units, continuous casting process parameters are acquired in real time, and solidification information of a continuous casting billet is calculated. By comparing a current electromagnetic stirring position with an optimal electromagnetic stirring position, the displacement required by a solidification-end electromagnetic stirrer is calculated in real time and the solidification-end electromagnetic stirrer is guaranteed to be always in an optimal stirring position of the cast steel. The device comprises an arc-shaped guide rail, a slide mechanism, a drive mechanism and a controller, wherein the solidification-end electromagnetic stirrer is fixedly mounted on the slide mechanism; the slide mechanism is positioned on the arc-shaped guide rail; one end of the drive mechanism is connected with the slide mechanism, and the other end of the drive mechanism is connected with the controller. The dynamic control method and device better solve a difficult problem of incapability of adjusting a conventional solidification-end electromagnetic stirrer in real time along with a continuous casting process, and are good in field implementation effect.

The invention belongs to the field of metallurgy, and particularly relates to a manufacturing method for round billets with overlarge cross sections. The manufacturing method includes the steps of 1 pouring, wherein molten steel is poured into a pouring basket from a steel ladle; 2 crystallization, wherein the molten steel in the pouring basket is poured into a crystallizer to obtain casting billets which are not completely solidified, the properties of mould fluxes of the crystallizer are as follows: alkalinity is 0.2-0.5, melting temperature is 980-1130 DEG C, and the viscosity under 1300 DEG C is 12-18 Pa. s, and mould electromagnetic stirring is set as follows: current is 400-500A, and frequency is 3.0-4.0 Hz; 3 billet withdrawal, wherein the billet withdrawal speed is 0.08-0.13m/min; 4 secondary cooling, wherein an upper secondary cooling area adopts full-water strong cooling, a lower secondary cooling area adopts air-water atomization weak cooling, the composite spray water rate is 0.25-0.35L/kg steel; 5 continuous straightening of the casting billets obtained after secondary cooling, wherein the strain rate of straightening is controlled to be from 0.08% to 0.13%. By means of the manufacturing method, the batch production of the round billets with the diameter of 900mm or above is realized based on a full-arc type alloy steel continuous casting machine with the radius of the arc being 16.5m, and additionally, the round billets are good in surface and internal quality.