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Ningbo is a casting production base for various castings(investment casting,sand casting,aluminum die casting,ect) in China.Some foundries are very busy on production,but some are just with little business.So to be a good business foundry is very important.We,Tongda foundry,mainly focused on manufacturing investment castings.By our many years' efforts,we have been a top foundry and are still improving ourselves to be better. Today we would like to talk about how to be a top investment casting foundry according to our experience:
Investment castings with internal defects,which are assembled in the equipments,will bring unpredictable hazard to production.It will not only shorten the service life,but also causing accidents.
Investment casting gating system design is different from ordinary sand casting, because it is not only guide the liquid metal into the cavity of the channel, but also act as the bearing function on the wax module and shell and the channel guiding pattern material in and out of the cavity.So it is extremely important to design investment casting gating system.If the design is not reasonable, it will not only affect the quality of module assembly and demoulding, and will directly affect the quality of cast iron castings, to cause the casting defects such as shrinkage cavity, porosity, slag inclusion,cracks,ect.
Both cast iron and cast steel are the important materials used for castings in china. But the castablility of cast iron is better than cast steel.There're some reasons which cause the difference.
Normally,our customers pay more attention to whether we could make investment castings they need.In fact,even the best casting foundry could also make out unqualified products.So we also need to do quality control of investment castings to serve our customer better.
Die casting process is the use of machine, mold and alloy and other three elements, the pressure, speed and time unified process. Used for metal hot working, the existence of pressure is the main characteristics of die casting process different from other casting methods. Pressure casting is a fast developing special casting method with less cutting in modern metal processing technology. It is the process of filling casting mold with molten metal under high pressure and high speed, and forming casting by crystallization and solidification under high pressure. High pressure and high speed are the main characteristics of pressure casting. The commonly used pressure is tens of mpa, the filling speed (gate speed) is about 16 ~ 80 m/s, the metal liquid filling mold cavity time is very short, about 0.01 ~ 0.2 seconds.
