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Gray cast iron is a kind of cast iron. Carbon is present in cast iron as flake graphite. The fracture is gray. Good casting, cutting performance, good wear resistance. Used for manufacturing frame, box, etc. The graphite of gray cast iron is flake, the effective bearing area is relatively small, and the graphite tip is easy to produce stress concentration, so the strength, plasticity and toughness of gray cast iron are lower than other cast iron. But it has excellent vibration damping, low notch sensitivity and high wear resistance.
Lost Foam casting is, in terms of casting processes, a relatively recent innovation that exhibits characteristics of both Investment casting and Sand Casting. It is a form of evaporative pattern casting where the pattern is of foam rather than wax. The foam pattern is covered in refractory material, as in investment casting, but the ‘shell’ is then surrounded by compacted un-bonded sand to give it strength. When molten metal is poured into the shell the foam pattern vaporises on contact. The result is a process that delivers the quality and accuracy of investment casting with the lower costs and greater flexibility of sand casting.
Surface roughness refers to the roughness of the processed surface with small spacing and small peaks and valleys. The distance (wave distance) between two wave peaks or two wave troughs is very small (less than 1mm), which belongs to the microscopic geometric shape error. The smaller the surface roughness, the smoother the surface. Surface roughness is generally formed by the processing method used and other factors, such as the friction between the tool and the surface of the part during the machining process, the plastic deformation of the surface metal during chip separation, and the high frequency vibration of the process system. Due to the different processing methods and workpiece materials, the depth, density, shape and texture of the traces left on the processed surface are different. .
Aluminum die casting is a kind of pressure casting parts, is to use the installed pressure casting mold casting machine die casting machine, the heat of liquid poured into the aluminum or aluminum alloy die-casting machine into the mouth of the die casting machine die casting, casting the shape and dimensions of the mould limit of aluminium or aluminium alloy parts, such parts are often called aluminum die casting.
Steel casting refers to the parts formed after the steel is melted and poured into a specific casting mold and cooled and solidified. Steel castings usually refer to carbon steel and low alloy steel castings, which have high strength, high toughness and good weldability. Such as heat resistance, pressure resistance, corrosion resistance, low temperature resistance and wear resistance, there are casting special steel.
Surface roughness refers to the small spacing and the unevenness of small peaks and valleys on the machined surface. Surface roughness is generally formed by the machining method and other factors, such as the friction between the tool and the surface of the part during machining, the plastic deformation of the surface metal during chip separation, and the high frequency vibration in the process system. Due to the different processing methods and workpiece materials, the depth, density, shape and texture of the traces left on the processed surface are different. Surface roughness is closely related to the mating properties, wear resistance, fatigue strength, contact stiffness, vibration and noise of mechanical parts, and has an important influence on the service life and reliability of mechanical products. Generally, Ra is used for labeling.
