Features of machine cast
(1) Good wearing resistance and vibration resistance. Because graphite of cast iron is used to lubrication and oil storage, so it has good wearing resistance. Similarly, vibration resistance is better than steel.
(2) a good machine casting process performance. Due to the high carbon gray cast iron, close to the eutectic composition, the relatively low melting point, good fluidity, low shrinkage, and therefore suitable for casting complex structure or thin-walled castings. Further, since graphite is easy to form the cutting chip when breaking process, cutting of the gray cast iron is superior than steel.
Relationship between hardness and tensile strength: between hardness and tensile strength of gray cast iron, there is a certain correspondence, its formula is
1, when O≥196N/mm㎡,HB = RH (fly 00 +0 4380b) (B1)
2, when 0≥796N/mm㎡, HB = RH (44 + O 7240b) (B2) .
the value of the relative hardness (RH) mostly is decided by raw material ,melting process, the processing and the cooling speed of cast.
The use of resin sand casting machine
Resin sand is stiffness, Initial casting has high strength which use graphite cast iron expansion when sand casting solidification process, effectively eliminating shrinkage, shrinkage defects, to achieve gray iron, ductile iron less riser, non-riser casting.
Mold Casting processing use Polystyrene foam pattern to make Furosemide feeding Resin Sand mold. When the liquid metal poured into the mold, Foam Rapid gasity at a high temperature action of liquid metal,burn and disappear, the liquid metal replaced foam originally position, cooled and solidified into the same shape of real castings.
In contrast, LFC to produce single or small quantities of cars’ Covering parts Large molds like milling bed has a great advantage compared to traditional sand, which not only eliminates the cost of expensive wood type, and ease of operation, shortening the production cycle, improve production efficiency, high dimensional accuracy, small allowance, good surface quality and other advantages.