hp graphite electrode for foundry
MF smelting hp graphite electrode for foundry furnace construction method and service life influencing factors
Intermediate frequency heating furnace is a kind of electric induction heating equipment, which is widely used in foundry industry, forging industry, heat treatment industry, petroleum machinery industry, mining and coal mining machinery industry, steel pipe industry, anti-seepage steel industry, machinery industry, hot processing industry, metallurgy Industry, automobile and auto parts, construction machinery and other industries due to its advantages such as automation, fast heating speed, good oxidation and decarbonization, etc.
Due to a series of factors such as long furnace building time, non-reuse of furnace lining materials, and tight production tasks, users hope to use more furnaces. Sometimes one furnace with multiple furnaces may cause molten iron to leak into the furnace lining, and even endanger the safety of equipment and personnel.
Almost every time the furnace is built, the operating time will be different. For the same team, the same material, and the same process, there may be dozens of furnace differences. Therefore, it is necessary to construct the lining of each furnace, to judge the use status of the lining, and to extend the service life of the lining as reasonably as possible.
Next, we will explain the construction of the smelting furnace, mainly introducing the types of lining materials, the ramming method of the lining, the example diagram of the furnace, the reasons that affect the service life of the lining, and the methods and means to extend the service life of the lining.
Types of charge for intermediate frequency smelting furnace
The name of the intermediate frequency furnace lining material is different from the industrial furnace lining material, such as intermediate frequency furnace dry vibrating material, intermediate frequency furnace dry ramming material, intermediate frequency furnace ramming material, etc.
Due to the wide range of smelting material industries and varieties of intermediate frequency smelting furnaces, they are used for smelting gray cast iron, ductile iron and cast iron alloys, smelting carbon steel, alloy steel, high manganese steel, tool steel, heat-resistant steel, stainless steel, smelting aluminum and its alloys, For smelting copper alloys such as copper, brass, cupronickel and bronze, the corresponding intermediate frequency furnace materials are different.
According to the acidity and alkalinity of the charge, it can be divided into three types: neutral, alkaline and acidic.
The acid charge is made of high-purity quartz and fused quartz as the main raw materials, and the composite additive is the sintering agent;
The neutral intermediate frequency charge is made of alumina and high-aluminum materials, and composite additives are used as sintering agents;
The basic intermediate frequency charge uses high-purity corundum, high-purity fused magnesia and high-purity spinel as the main raw materials, and composite additives as sintering agents.
Intermediate Frequency Melting Furnace Beating Method
There are two construction methods for intermediate frequency smelting furnace, dry method and wet method, both of which can be used for different lining materials. We usually use a combination of wet and dry methods to vibrate the core furnace, while the coreless furnace uses the wet method.
The method of mixing water, water glass and other binders in the lining material is the wet firing method. The advantages and disadvantages of wet furnace hitting are obvious. We need to judge based on the actual situation to reduce dust and form a good furnace lining. The structural density of the ramming furnace lining is lower than that of the dry building furnace, and long-term drying is required. During the drying process, it will also cause inter-turn ignition of the sensor and short-circuit to the ground. The ramming of large and medium-sized smelting furnaces should be avoided as much as possible.
Dry furnace building is mainly used for crucible smelting. Due to the increase of fine powder, the increase of density and the reduction of furnace lining cracks, the fire resistance of the material can be maximized, and the safety and reliability of the furnace lining can be improved.
Steel tapping process of intermediate frequency melting furnace
The crucible should be selected according to the requirements of use. When the mold crucible is used many times, the coreless furnace with the lining crucible should be taken out after the furnace is heated. If you need to avoid impurities, hp graphite electrode for foundry, corundum crucible and other common hollow crucibles during use, we will take hp graphite electrode for foundry as an example.
Core smelting furnace preparation materials
The hp graphite electrode for foundry is easier than the coreless crucible. After all, the hp graphite electrode for foundry will be monitored according to the thickness after oxidation and combustion, and the service life will be known. There is no need to worry about whether there are gaps in the charge and air cracks.
The materials we need to prepare are: glass fiber cloth, induction furnace lining refractories, water glass, smelting furnace, hp graphite electrode for foundry. Tools need to prepare ramming sticks, mixing buckets, molds, scissors, etc.