Machine tool bed casting standard: GB9439 -- 88

Features of machine tool bed casting:

(1) good wear resistance and shock elimination. Because the graphite in cast iron is good for lubrication and oil storage, so the wear resistance is good. Similarly, due to the existence of graphite, gray cast iron is better at damping than steel.

(2) good process performance. Due to its high carbon content and nearly eutectic composition, grey cast iron has a low melting point, good fluidity and small shrinkage, so it is suitable for casting complex or thin-walled castings. In addition, gray cast iron is more machinable than steel because graphite makes it easy to form chips when cutting. Machine tool bed casting

The resin sand mold has good rigidity and high strength in the early stage of casting, so it is possible to take advantage of graphitization expansion in the solidification process of cast iron, effectively eliminate shrinkage cavity and porosity defects, and realize less riser and no riser casting of gray cast iron and nodular cast iron. In the production of solid mold casting, the styrofoam pattern of polystyrene is applied to furabu resin self-hardening sand molding. When the liquid metal is poured into the casting mold, the foam pattern is rapidly vaporized and burned away under the action of high temperature liquid metal. The liquid metal replaces the original position occupied by the foam, and then cools and solidifies into solid castings with the same shape and shape.