东莞市长安博扬金属材料有限公司

【李婷3】【-】【：】
Gray cast iron
Pearlite type gray cast iron can be used for pump casings, vessels, and towers that require high strength and certain corrosion resistance. , flanges, stuffing box bodies and glands, carbonization towers, nitrification towers, etc. can also be used to make machine tool beds, columns, cylinders, gears and parts that require surface quenching.
Gray cast iron
Material name: Gray iron
Brand:
Standard:
Type: Pearlite type gray cast iron
Density: about .3< br/> Chemical composition
Carbon: .~3
Silicon: .~
Manganese.~
Sulfur: .~
Phosphorus: .~. Gray cast iron
Properties
Mechanical properties
Tensile strength:
Hardness: (R) Sample size: Test rod diameter:
Other characteristics
Strength, wear resistance , heat resistance are good, vibration damping is good, casting performance is good, artificial aging treatment is required.
Scope of use
It can be used for pump casings, containers, towers, flanges, stuffing box bodies and glands, carbonization towers, nitrification towers, etc. that require high strength and certain corrosion resistance. It can also be used to make machine tools. Body, column, cylinder, gear and parts that need to be surface hardened.
Because of its small thermal deformation, it is often used in high temperature situations.
Heat treatment specifications and metallographic structure
Heat treatment specifications: (determined by the supplier, the following are the heat treatment specifications of a certain sample for reference) As-cast
Metallographic structure: flake graphite + pearlescent The body can be quenched, but gray cast iron (, etc.) are generally used in the annealed or normalized state without quenching treatment. If the hardness is required locally, high or medium frequency quenching can be performed.
Medium frequency quenching: the hardened layer is 3~mm, the hardness is high, and the deformation of the workpiece is small.
High-frequency quenching: quenching layer ~ mm, quenching temperature, surface hardness above the quenching temperature ~ degrees, surface hardness can reach.
Castings Resin sand castings are generally cast iron types and are suitable for manufacturing track plates, cylinder liners, pump bodies, valve bodies, gear boxes, gears, machine tool castings, machine tool beds, large castings, and cast iron platforms for steelmaking. Marking plates, levels, machine tool beds, columns, oil cylinders, and piston rings and pistons of gasoline (diesel) engines, etc.
Characteristics of commonly used grades
Grades, properties and uses of gray cast iron (B)
: Used to manufacture simple castings that only bear light loads, such as covers, covers, trays, oil pans, handpieces Wheels, hand frames, bottom plates, handles and steel ingot molds, blast furnace counterweights, steelmaking furnace weights, etc. in metallurgical equipment.
: Used to manufacture castings that bear moderate bending stress and have higher pressure between friction surfaces, such as machine tool worktables, slides, bases, automobile gearboxes, intake and exhaust pipes, pump bodies, valve bodies, valves Gai et al.
: Suitable for manufacturing track plates, cylinder liners, pump bodies, valve bodies, gear boxes, gears, marking plates, levels, machine tool beds, columns, oil cylinders and gasoline (diesel) engines for steelmaking. Piston rings, pistons, etc.
Suitable for manufacturing castings that can withstand high exaggerated stress and require high air tightness, such as heavy machine tool beds, gears, cams, large engine crankshaft cylinder blocks, high-pressure oil cylinders, rolling mill bases, etc.
Used in the manufacture of lathes, punches and other heavy machinery that are subject to greater stress, such as machine bases, rolling slides, rollers, coking columns, cylindrical mixer ring gears, supporting wheel seats, etc.
Brands of malleable iron , performance and use
Cast iron grades are used to manufacture pipe fittings, low-pressure valves, rear axle housings of automobiles and tractors, steering mechanisms, machine tool parts, etc.
Cast iron grades,,,: Castings that require higher strength and better wear resistance, such as gear boxes, camshafts, crankshafts, connecting rods, piston rings, etc.
Cast iron grades BBB, this is white Core malleable cast iron is limited to the manufacture of thin-walled castings and castings that do not require heat treatment after welding. Due to the complicated process, it is rarely used in machinery manufacturing.
Application of gray cast iron
Characteristics of resin sand castings
The resin sand mold has good stiffness and the sand mold has high strength in the early stage of pouring. This makes it possible to utilize the graphitization expansion during the solidification process of cast iron to effectively eliminate shrinkage. Holes and shrinkage porosity defects can be eliminated to achieve riser-less and riser-less casting of gray cast iron and ductile iron castings.
In the production of solid mold casting, polystyrene foam moldings are used, and miran resin self-hardening sand is used for modeling. When the molten metal is poured into the mold, the foam plastic shape quickly vaporizes under the action of the high diffusion and boundless molten metal, burns and disappears. The molten metal replaces the position originally occupied by the foam plastic, cools and solidifies into a solid material with the same shape as the model. type castings.
Relatively speaking, lost foam casting has great advantages over traditional sand molds for the production of single pieces or small batches of large molds such as automobile panels and machine tool beds. It not only saves the cost of expensive wooden molds, but also It is easy to operate, shortens the production cycle, improves production efficiency, and has the advantages of high dimensional accuracy, small machining allowance, and good surface quality.
Structural characteristics of large castings and machine tool castings
Although there are many types of machine tool castings, from the perspective of casting technology, they mainly have the following structural characteristics:
) Among machine tool castings The basic parts are all box-shaped structures, and many reinforcing ribs are added, making the casting structure shape more complex. When casting, more cores are needed, and core supports are often used to fix the cores. The gas generated by the cores is difficult to eliminate during casting, and defects such as pores and blisters are likely to occur.
) Some parts of the casting, such as guide rail surfaces, shaft holes and grooves (after increasing the machining allowance), are thicker. In addition to being prone to shrinkage holes and shrinkage porosity, the properties of cast iron also affect the wall thickness. It is relatively sensitive and can easily cause loose tissue, coarse graphite, low hardness, and non-wear resistance. When the thickness of these parts is too different from the surrounding connecting wall, defects such as cracks may easily occur. 3) Some castings that bear oil pressure and cutting fluid pressure are required to have high air tightness and no leakage is allowed.
) As cutting processing develops in the direction of automation, high speed, and powerful cutting, the emergence of CNC machine tools has caused some changes in the structure of machine tool castings and brought about some casting process problems. For example, due to the installation of CNC devices, there are many wires in the box casting, and holes need to be provided on the walls and ribs of the casting for wiring, and the locations of these holes are not necessarily at locations where it is easy to set up the core exhaust. In addition, because these holes weaken the strength and rigidity of the box, cracks are likely to occur on its edges, and ribs and convex edges are often required to strengthen the box, making the structure more complex. In addition, the pallet that receives the cutting will also increase, making the outline size of the casting larger.
The main defects and locations of large machine tool castings are prone to occur. On the basis of analyzing the causes of these defects, technicians try their best to design reasonable structures to avoid defects.
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