5 results about "Electromagnetic casting" patented technology

The solidification weld line is a comprehensive manifestation of the casting and rolling process. Addressing the "Ɔ"-shaped phenomenon of the solidification weld line in traditional casting and rolling processes, which leads to edge cracking and low yield in conventional cast and rolled sheets, this invention discloses a special electromagnetic casting roll for magnesium alloy casting and rolling. The roll includes a roll core, a roll sleeve, and end caps. A coil is uniformly wound between each water channel on the roll core, and a coil is uniformly wound inside the roll sleeve. The end caps are made of composite ceramic material, and an insulating gasket is placed between the end caps and the coils to ensure good insulation. A pre-reserved groove on the end caps is used to adjust the energization of the coils on the roll core. The annular coil is connected to a brush to ensure smooth external power supply to the roll core and roll sleeve. The end caps are used to fix the roll core and roll sleeve. This invention can directionally and quantitatively improve the morphology of the solidification weld line and control the temperature of the casting and rolling zone by adjusting the parameters of the pulse current and the casting and rolling process parameters. This effectively reduces segregation, refines grains, and homogenizes the microstructure in cast and rolled strips, thereby improving the yield and product performance of magnesium alloy cast and rolled strips.

This invention discloses a method for preparing high-strength, high-toughness, ultra-thin aluminum foil for power batteries using cast-rolled 8006 alloy, belonging to the field of aluminum alloy material technology. The method uses 20%–30% by mass of remelted aluminum ingots and 70%–80% by mass of 8021 alloy cast-rolled coil scrap as raw materials. Ceramic aluminum seed crystals are added, and the alloy composition is adjusted to Si 0.2%–0.3%, Fe 1.2%–1.4%, Cu 0.05%–0.07%, Mn 0.3%–0.5%, Mg≤0.02%, Zn≤0.05%, Ti 0.01%–0.02%, with the balance being Al. After melting, adding aluminum-titanium-carbon and aluminum-titanium-boron grain refiners, degassing, two-stage filtration, and tubular filtration, the aluminum foil is cast using an electromagnetic casting crystallizer, followed by high-temperature recrystallization annealing, cold rolling, longitudinal shearing, foil rolling, inspection, and packaging to obtain the finished aluminum foil. The aluminum foil prepared by this invention has a thickness of 0.008 mm, a tensile strength ≥310 MPa, a yield strength ≥280 MPa, and an elongation ≥4.0%, and has the advantages of high strength, high elongation, low pinhole rate, and low oil content.

The application provides a method for preparing CuMn alloy by aluminum thermal reduction-electromagnetic casting, and belongs to the field of copper alloy preparation. The method comprises the following steps: preparing raw materials CuO, MnO2 powder, Al powder, CaO and KClO3, and adding CaO for slagging and 0-5% KClO3 as a heating agent when the raw materials are proportioned according to the mass of the required CuMn alloy; adding the mixture into a reaction furnace in batches to obtain WCu alloy melt and Al2O3-CaO reduction smelting slag; preparing calcium aluminate cement clinker from the obtained Al2O3-CaO smelting slag; and obtaining homogeneous CuMn alloy ingot after high-temperature mutual-solubility CuMn alloy melt is stirred in an electromagnetic field and cooled and solidified. The application utilizes the heat released by the reaction and does not need additional heat supply, and the preparation is carried out in a non-vacuum environment without a high vacuum degree. The electromagnetic stirring makes B single elements uniformly and dispersedly distributed in the Cu matrix, and water cooling and solidification effectively solves the segregation problem. The calcium aluminate slag generated by the application can be used to prepare calcium aluminate cement clinker, and the clean production of CuMn alloy is realized.

The invention discloses in-situ synthesis MgO / graphene synergistically enhanced Mg-Zn eutectic brazing filler metal applied to magnesium alloy brazing and a preparation method of the in-situ synthesis MgO / graphene synergistically enhanced Mg-Zn eutectic brazing filler metal, and relates to Mg-Zn eutectic brazing filler metal applied to magnesium alloy brazing and a preparation method of the Mg-Zn eutectic brazing filler metal. The problems that in the preparation process of existing brazing filler metal, the reaction efficiency of gas and melt is low, reinforcement phase distribution is uneven, and pores and shrinkage porosity are prone to being generated when cast ingots are solidified are solved. According to the method, CO2 gas is accurately introduced into magnesium melt through the gas-liquid synergistic honeycomb type distribution head under the action of an ultrasonic-mechanical stirring composite energy field, so that a gas-liquid reaction interface is remarkably enlarged, and uniform dispersion and distribution of MgO and graphene in an Mg-Zn eutectic matrix are realized; and air holes in a cast ingot are effectively eliminated by introducing an electromagnetic casting technology in the casting stage, the obtained brazing filler metal has a dispersion strengthening effect, the strength of a brazed joint is remarkably improved, and the preparation method is controllable in process and has wide application prospects in precise connection of magnesium alloy structural parts.

The invention relates to the technical field of sea rescue, in particular to a double-positioning search and rescue unmanned ship integrating electromagnetic net ring retracting and releasing and telescopic harrow supporting. A main propulsion propeller is arranged in front of the bottom of a double-buoy ship body, and an underwater positioning robot frame is arranged behind the bottom of the double-buoy ship body; an underwater positioning robot is arranged in the underwater positioning robot frame; a fire rescue device for falling into water is arranged at the upper part of the double-buoy ship body; an electromagnetic swim ring retracting and releasing device is further arranged at the front end of the upper part of the double-buoy ship body and is positioned at the upper part of the fire rescue device for falling into water; a communication and positioning device is arranged at the rear part of the upper end of the electromagnetic swimming ring folding and unfolding device, a wind driven generator and a solar panel are arranged in the middle, and an electromagnetic casting device is arranged at the front part; a telescopic supporting rake is assembled at the front end of the double-buoy ship body and located in the middle of the front portion of the electromagnetic swim ring retracting and releasing device and the fire rescue device for falling into water.