Precautions for precision castings

Update:13 Apr 2019
Summary:

Precision casting is a casting process with little or n […]

Precision casting is a casting process with little or no cutting and is an excellent process technology in the foundry industry. Its application is very wide, not only suitable for casting of various types and various alloys, but also the casting dimensional accuracy and surface quality are higher than other casting methods, and even other casting methods are difficult to cast, high temperature, and not easy to cast. The processed castings can be cast by precision casting. So what do you need to pay attention to for precision casting?
 
1. In order to prevent the white hole from being produced during precision casting, in addition to the measures taken in the process, the wall thickness must not be too thin (some materials indicate that when the wall thickness is 15mm or more, the corners of the cast metal castings must be used.) Rounded corners.
 
2. Due to the metal type and the core non-consistency, in order to facilitate the removal of the casting and the extraction type, the casting inclination of the precision casting casting should be larger than that of the sand casting, and should generally be 30%-50% larger.
 
3. The thickness of the inner wall and inner rib of the precision casting casting should generally be 0.6-0.7 of the thickness of the connected outer wall. Otherwise, due to the slow cooling of the inner wall (rib), cracks may occur at the intersection of the inner and outer walls when the casting shrinks.
 
4. Due to the fast heat dissipation of the metal type, the minimum wall thickness of precision casting should be larger than that of the sand casting casting, and the minimum wall thickness of various casting alloys and castings of different sizes.