Commercial production stage. (1) electromagnetic hydrodynamic casting method, i.e. Electromagnetic stirring method; (2) strain melting method; (3) mechanical agitation method; ④ chemical grain refinement method; (5) thermomechanical treatment; ⑥ Osprey method. 2.1 Electromagnetic Stirring Method the first semi-solid processing ingot blank produced by electromagnetic stirring method was produced by American Alumax Engineering Metals Technology Company (AEMP), which cast round ingots that met the requirements in 1978. At present, Mt.Holly Aluminum Factory and Intalco Aluminum Factory of Alumax Aluminum Co., Ltd. In the United States can produce MHDC round ingots with diameters of 75mm (3 ") and 150mm (6") by vertical casting and transverse casting methods for semi-solid forming processing plants all over the world. It is a schematic diagram of electromagnetic stirring casting method. The electromagnetic field generated copper fitting Manufacturers by the electromagnetic induction coil strongly stirs the solidified aluminum melt and knocks off the "branches" and "forks" of the crystalline dendritic crystals to form a spherical equiaxed grain structure.

The grain size can be controlled by controlling the technological parameters such as electromagnetic field strength, electromagnetic coil height, casting speed, cooling intensity, etc. * Yin Fei, School of Materials Science and Engineering, Shanghai Jiaotong University, Research Status of Semi-Solid Cast Aluminum Alloy Material at 1954 (200030) Huashan Road, Shanghai, Electromagnetic Rheological Casting Machine with External Rotor. Split plate 2. Crystallizer 3. Aluminum melt 4. Solidified aluminum melt 5. Semi-solid aluminum ingot 6. Casting machine ingot base 7. Cooling water 8. Rotor electromagnet permanent magnet rotor rheological casting machine can not only cast round ingots, but also flat ingots, square ingots, hollow ingots, etc. In addition,

It also has the following advantages: the rotor has simple structure and small volume, can be installed on the existing continuous or semi-continuous casting machine, and the reconstruction workload is very small; The rotor inductor can be designed and manufactured quite high, for example, up to 700mm, and the stirring time is prolonged, thus further improving the casting structure. The average power consumption per ton of ingot is 2kW, because the magnetic field is generated by permanent magnets, there is no loss of effective work and ineffective work, the power factor is very close to 1, and the equipment cost is extremely low. Rheological casting ingot blank has fine grains, uniform structure, almost no porosity and micropores, and high mechanical properties. It creates a prerequisite for high quality, high yield and high reproducibility of semi-solid castings. The grain size of electromagnetic stirring casting ingot can generally reach 60, which is fine spherical equiaxed grain suitable for semi-solid casting.

The grain size of conventional semi-continuous water-cooled ingots is generally 100 ~ 400, which is coarse columnar dendrite. 2.2 Strain melting electromagnetic stirring rheological casting can only cast ingots with larger diameters to form heavier parts with more than several hundred grams, that is, diameters & lt; 40mm round rods cannot be commercially produced by casting. Semi-solid casting of parts weighing tens of grams must use semi-solid blanks with small diameters. At present, in industrial production, This kind of blank is produced by strain melting method. 3. The technological process of this method is to apply <a href="https://www.bronzecast.net/product/other-brass-bronze-castings-series/">bronze casting</a> considerable cold deformation to the hot extruded or hot rolled bar with larger diameter, then heat it to a certain temperature between the solid phase line and the liquid phase line, i.e. A solid-liquid state, keep it warm for a certain period of time, and after solidification, a non-dendritic semi-solid structure can be formed. The obtain fineness