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The quality of investment castings raw material will have a great effect on investment casting quality.It is uncertain that choosing super material will improve production costs of investment castings.
Common defects of investment castings include dross and inclusions, blowholes, shrinkage porosity, shrinkage cracks, cold shuts, hot cracking/hot tearing/hot shortness, miss runs,etc. Such defects will affect the surface roughness and also the strength of the castings. So, all foundries pay lots of costs and time to solve such investment casting defects.
Tongda precision casting focuses on the techniques of silica sol, water glass，shell mould and lost-foam castings. The materials we are dealing with are stainless steel, carbon steel, alloy steel, ductile iron, grey iron and so on. Our OEM products are widely used in the industries of Automobiles.G.E.T., Forklifts, Marines and Railways.
Cast iron is iron carbon alloy which carbon content is greater than 2%.Carbon exist in cast iron mostly as graphite morphology,sometimes as cementite.In addition to carbon,also contains 1%~3% of silicon in cast iron,and manganese,phosphorus,sulfur and other elements.
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.
