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589 results about "Electromagnetic stirring" patented technology

Electromagnetic current coupling field assisted hybrid melting-brazing method for laser-TIG arc and equipment

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.
Owner:CHONGQING UNIV

Ti-based powder preparing device and Ti-based powder preparing method

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.
Owner:FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI

Quick changeable temperature small-sized constant temperature sample pool

InactiveCN101281121APrecise and fast temperature controlMeet the requirements of constant temperatureMaterial analysis by optical meansWater/sand/air bathsTemperature controlMetallic materials
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.
Owner:SHANGHAI JIAO TONG UNIV

Continuous casting bloom soft press technology based on tail end electromagnetic stirring

ActiveCN103121092AReduce dependenceThe effect of electromagnetic stirring is greatThermodynamicsHeat transmission
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.
Owner:UNIV OF SCI & TECH BEIJING

Electroslag smelting casting device with additional electromagnetic stirring and method

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.
Owner:NORTHEASTERN UNIV

Preparation process of nano powder modified and reinforced die steels

InactiveCN101880746ASolve the problem of reunionGood dispersionProcess equipmentIron powder
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.
Owner:江苏新亚特钢锻造有限公司

Dynamic control method for slab continuous casting electromagnetic stirrer

InactiveCN102554172AMeet the requirements of segregationImprove internal qualityThermodynamicsEngineering
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.
Owner:ANGANG STEEL CO LTD

Method for improving central carbon segregation of tire cord steel

InactiveCN101775461AImprove segregationMeet the requirements of segregationMaterials scienceHot rolled
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.
Owner:NANJING IRON & STEEL CO LTD

Method and device for removing heavy metals in industrial sewage by electromagnetic stirring paddle

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.
Owner:TONGJI UNIV

Method and device for performing electric magnetization resistance welding-braze welding compounding on dissimilar materials

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.
Owner:CHONGQING UNIV

Continuous casting method for improving central shrinkage cavity of small high-carbon steel square billet

ActiveCN103506586AConducive to cost controlSimplified means of operationElectromagnetic stirringSteel square
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.
Owner:ANGANG STEEL CO LTD

Apparatus for and method of producing on-demand semi-solid material for castings

InactiveUS6845809B1Produced in advanceMetal foundingMolten stateRobotic arm
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.
Owner:HANJOO METAL

Slab continuous casting crystallizer flow field control method

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.
Owner:BAOSHAN IRON & STEEL CO LTD

Method for directional solidification extraction of ultra-high-purity aluminum under electromagnetic agitation

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.
Owner:JIANGSU UNIV

Dynamic control method and device for electromagnetic stirring position at solidification end in continuous casting of steel

ActiveCN104690242AQuality improvementGive full play to the effect of electromagnetic stirring at the endElectromagnetic stirringTracking model
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.
Owner:NORTHEASTERN UNIV

Manufacturing method for round billets with overlarge cross sections

ActiveCN104525880AWith processing conditionsConditions for useMetallurgyStrain rate
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.
Owner:SHANDONG IRON & STEEL CO LTD
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