The foundry chooses cupola + induction melting furnace
Double melting with cupola and induction melting furnace melting iron has been arguing in the industry, both have their own advantages and disadvantages, but the fact is that in recent years, efficient, reliable, flexible operation of induction melting furnace equipment occupied The vast majority of the domestic market.
How to choose the right electric furnace in the engineering design, there are some problems that need attention in the design, this article will be discussed.
1Select cupola or induction melting furnace
When the cupola melts the molten iron, a series of redox reactions have a certain metallurgical process for the molten iron, and the molten iron of the electric furnace is only a melt remelting process, which determines the quality of the molten iron of the cupola in some respects than the electric furnace. Slightly better. In order to obtain high quality and stable molten iron by electric furnace, the quality of raw materials is good, but the one-time investment of electric furnace under the same conditions is only 1/2 1/3 of the cupola. If there are many varieties of castings and different materials, choose electric stove
Product flexibility will be high. Under normal circumstances, the electric furnace is often used when the productivity is below 10 t/h, and the cupola can be considered when the pressure is above 15 t/h. The electric furnace is a large power consumer, and the electricity consumption per ton of molten iron is about 600 kW·h. Therefore, when selecting the electric furnace, it is necessary to consider the local power supply conditions, often
The pull limit current will affect normal production.
2 induction melting furnace equipment composition
The electric furnace is mainly composed of two parts: mechanical equipment and electrical equipment, and is equipped with a special oil-immersed transformer. The mechanical equipment includes the furnace body, the tilting device and the water cooling system; the electrical equipment includes the intermediate frequency power supply, the compensation capacitor and the control protection system. The electric furnace is melted by the induction coil of the furnace to generate an alternating magnetic field, and an induced current is generated in the metal charge to make the iron material
The heat is melted and the temperature of the molten iron can reach 1550 °C. The water cooling system is the life guarantee for the reliable operation of the electric furnace. It plays the role of cooling and cooling the furnace body and the power supply cabinet. The furnace body and the power supply are provided with two sets of cooling systems, which are closed and cooled by water. The internal circulation system is closed and often uses distilled water;
The external circulation system generally uses demineralized water or tap water depending on the water quality of each place.
The power cabinet has two types: current feed parallel inverter mode and voltage feed series inverter mode. Due to different design lines, the rectification, smooth wave, inverter mode and load resonant circuit connection method are different.