Gravity die casting replys on gravity other than high pressure to pour aluminum or zinc alloys which makes more simple for cast products. Here are some of its advantages:
- Parts are taken from mold directly, excellent dimensional accuracy.
- Compared with sand casting, the surface finish of gravity die cast parts is better.
- Mechanical properties, especially tensile strength, are superior to those made in sand casting.
- The wall thickness of parts can be bigger than those made by pressure die casting.
- Sand core parts could be allowed to creat hollow sections of the parts.
- The tooling cost is much lower than pressure die casting.
- Due to fewer production steps and a simpler apparatus, gravity die casting allows for shorter production times and quicker turnaround.
- Less defects are found by gravity die casting than sand casting.
Of course, gravity die casting is not omnipotent, there are also some disadvantages as follows:
- The tooling costs are higher than sand casting
- The thinnest possible wall is between 3 mm and 5 mm thick
- Not all the metals could be made in gravity die casting, for precision stainless steel parts, investment casting is preferred.
Overall, gravity die casting is cost effective and offers a host of advantages over other techniques. It is a good casting method for its excellent mechanical properties, tight tolerances and quick production capabilities.