Development trend of casting alloy smelting in China

Develop large-scale cupola of more than 5t / h and adopt external hot air supply and water-cooled cupola without furnace lining for continuous operation according to the needs; carry out cupola induction furnace dual melting process; Advanced desulfurization and filtration technology of molten iron is widely used (development of new low cost foam ceramic filters have a fever of low sintering temperature and short sintering time), new foam ceramic filters suitable for various active alloys, stable physical properties of high temperature, special shaped foam ceramic filters suitable for special casting processes such as investment casting and metal mold casting, in-depth study of filtration and purification mechanism of foam ceramic filters and effects on metal solidification process. Mechanism and system study the application technology of foam ceramic filter, including selection of aperture and thickness, placement and gating system design, pouring temperature and speed and control of metal hydraulic head, etc., carry out series and standardization work of foam ceramic filter), equipped with direct reading spectrometer, carbon equivalent fast detector, quantitative metallographic analyzer and spheroidizing rate detector. The application of microcomputer technology in the thermal analysis of cast iron melt. The technology of cupola dehumidification and air supply should be popularized and cupola waste gas should be used to eliminate environmental pollution and improve the quality of molten iron.

Induction furnace has the advantages of flexibility, energy saving and high efficiency. The adoption of induction furnace will be the development direction of cast iron smelting technology in the future. Develop new alloy inoculation technology (such as late inoculation), popularize alloy cored wire technology, improve the success rate of spheroidizing treatment, reduce the scrap rate of castings and improve the comprehensive properties of castings.

The refining technologies such as argon stirring, calcium injection purification, AOD and VOD are used to improve the purity, uniformity and grain refinement of molten steel, reduce the amount of alloy added, improve the strength and toughness of castings, reduce the weight of castings and reduce the scrap rate.

In the production of aluminum alloy castings, the technologies of refining, modification, grain refinement and rapid detection in front of furnace, which are pollution-free, efficient and easy to operate, are mainly solved. For different grades and different purposes of alloys, the optimization of processing parameters of solution and aging is studied by using computer numerical simulation technology, so as to develop the potential of materials and improve the performance of materials. Introduce and digest advanced refining technologies such as rid and fi to improve the smelting level of aluminum alloy.

Further study the smelting process of magnesium alloy, strengthen the commercialization of pollution-free and efficient solvent for smelting magnesium alloy, strengthen the development of casting, recovery and remelting technology of high-purity casting magnesium alloy materials, magnesium rare earth heat-resistant casting magnesium alloy materials and magnesium matrix composite materials, and further strengthen the research and development of magnesium alloy casting and squeeze casting technology, To adapt to the rapid development of China’s automobile industry.

Improve titanium alloy smelting equipment, solve the existing problems of mold materials, The effects of mold heating mode and preheating temperature on the quality of castings, the volatilization behavior of alloy elements and their effects on alloy composition, the effects of impurity elements on the quality of titanium castings, the optimization of melting process parameters for different alloys under different conditions, the research of investment casting materials and processes for titanium alloys, hot isostatic pressing and welding repair of castings were carried out Process research.