What is Gravity Die Casting
The ‘gravity’ part of the name refers to the fact that molten metal is poured from a vertical position into a metallic tool. The process differs from pressure die casting because there’s no additional force applied, and can also use both metal and sand cores, called semi-permanent mould casting.
Advantages of this method include lower levels of trapped gas within the mould, which leads to high integrity casts with good surface finish. Pouring the metal through this process also prevents the possibility of the metal folding over itself when it’s introduced to a mould too quickly.
This method is best suited for larger, thicker parts than pressure die casting, but it can produce great levels of detail. And by using sand cores, you can achieve more complex designs and have more flexibility during the process.
When heat treatment is necessary, gravity die casting has the advantage. This process also offers exceptional tolerances and surface finish. Gravity die casting tooling is much more simple in construction and has a significantly lower cost, which is suited to lower volumes, where designs may still be subjected to review.
Parts are low cost as well, although not as low as the ones in pressure die casting processes.