Basic principles of hard nickel castings and quick firing at low temperature

- Mar 25, 2019-

Basic principles of hard nickel castings and quick firing at low temperature

 

Nickel-hard castings are made with reasonable process design, and the inner runner is set in the position of the machine tool casting relative to the thin wall, which is more and more dispersed in several hours.So that the first into the thick wall of the metal liquid take the lead in solidification, thin wall after solidification, so that the basic equilibrium everywhere solidification.For machine tool castings with uniform wall thickness, multiple internal gates and air holes are used.Multiple internal runner, dispersion and uniform distribution, so that the overall heat balance.The air hole is thin and many, namely the exhaust gas is unobstructed also plays the heat dissipation function.

 

The nickel-hard castings are rapidly fired at low temperatures and operated with an open casting system, which allows the liquid metal to fill the mold quickly, smoothly and evenly, depending on the part.The strength of the machine tool mold of ductile iron is large, its surface hardness is 90, and the rigidity of the sand box is large, which is good for eliminating shrinkage and porosity.

 

When the risers are needed for hard nickel castings, when the hot risers are first moved and leave the hot joints, the tilting and alloying of the castings will benefit.Eliminating shrinkage defects of machine tool castings is a complicated process.In accordance with the basic principle of "heat balance", scientific analysis should be made on the spoiled casting, reasonable process plan should be made, suitable molding materials should be selected, tooling should be correctly operated and standardized.Then any machine tool casting shrinkage defects can be solved.www.wuxiorient.com