1 Casting structure and process design (1) If the cross-section difference of the casting is too large, the thicker cross-section will cool slowly and cause the coarse grains there. Metals, such as gray cast iron, which are very sensitive to cross-sectional changes, are more likely to produce such defects. An effective way to prevent such defects is to avoid excessive...

Castings are metal moldings obtained by various casting methods, that is, the smelted liquid metal is poured into a pre-prepared mold by pouring, injection, suction or other casting methods, and after cooling, it is polished and other subsequent processing methods. The resulting object has a certain shape, size and performance. According to data from the American Foundry Association: In 2019, the global...

Electric furnace is a heating furnace that converts the electric energy in the furnace into heat to heat the workpiece. Compared with fuel furnaces, the advantages of electric furnaces are: the atmosphere in the furnace is easy to control, and can even be vacuumed; the material is heated quickly, the heating temperature is high, and the temperature is easy to control ....

The spheroidization level of domestic ordinary spheroidal graphite cast iron castings is required to reach level 4 or above, (that is, the spheroidization rate is 70%), the spheroidization rate achieved by the general foundry is about 85%. In recent years, with the development of nodular cast iron production, especially in industries with high requirements for wind power casting...

In order to eliminate the residual stress of the casting, stabilize its geometric size, reduce or eliminate the distortion produced after cutting, it is necessary to perform stress relief annealing on the casting.    The determination of stress relief annealing temperature must consider the chemical composition of cast iron. When the temperature of ordinary gray cast iron exceeds...

One. Casting method: green sand casting, manual modeling. Two. The formula of modeling materials: 1. Back sand: new sand 5%, old sand 94%, bentonite 1%. 2. Surface sand: new sand 40.4%, old sand 50%, bentonite 4.5%, coal powder 4%, heavy oil 1%, sodium carbonate 0.1%. 3. Core sand: 52% new sand, 40% old sand, 6% clay, 2%...

Magnesium, rare earth and calcium all have the effect of spheroidizing graphite in cast iron. In terms of comprehensive evaluation of their effects, magnesium is the first. However, under the condition that magnesium is used as the main spheroidizing element, if appropriate rare earths are used, it can complement each other and achieve better spheroidizing...

Nodular cast iron is obtained by spheroidization and inoculation treatment to obtain nodular graphite, which reduces the fracture effect of graphite on the matrix, effectively improves the mechanical properties of cast iron, and obtains higher plasticity, toughness and strength. Nodular cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive properties...

1. Common problems of pouring machine 1. Don't understand what is the best pouring? This leads to incorrect evaluation and selection of pouring equipment. 2. Using a vertical parting boxless molding line, but wrongly choose a pouring machine that needs to stop production or low efficiency to replenish molten iron. 3. The vertical...

Furan resin sand is generally used as the molding material for large-scale ductile iron castings produced in my country. It is produced in a single piece, with a large pouring weight and a complex structure. The quality and performance requirements of the castings are very high. Some casting defects, especially shrinkage defects, often appear in the smelting process. It will cause the casting to be scrapped...

1. Introduction The chemical composition of molten iron is the same, and the smelting process is different, and the properties of cast iron obtained vary greatly. Induction electric furnace smelting of molten iron can effectively control the temperature of molten iron, accurately adjust the chemical composition, reduce element burning loss, and have low sulfur and phosphorus...

Pearlitic ductile iron is ductile iron in which pearlite accounts for more than 80% of the matrix structure. The three grades of ductile iron, QT600-2, QT700-2, and QT800-2 in China's national standards, belong to this type. This type of ductile cast iron is usually obtained by normalizing, and it can also be obtained by adding alloying elements and cooperating with technological measures....