HOME| Casting Comparison Matrix
Permanent
Mold Casting
Or Gravity Die Casting utilizes metal molds,
usually iron or steel. The mold is preheated, assembled and molten aluminum is
introduced at the top of the mold. Steel cores, if used, are removed shortly
thereafter. Upon solidification, the mold is opened and the casting ejected.
The cycle repeated.
The process is not as quick or efficient as
die casting over large product runs but offers significant advantages over sand
casting in some situations. In limited production runs permanent mold casting
has the lowest total per piece cost of any casting process.
Reduced
Weight and Dimensions from
improved Mechanical Properties. A finer grain structure is achieved by rapid
solidification caused by using a steel die, which acts like a heat sink. This
characteristic allows for reduced section thickness and weight while
maintaining the required physical strengths.
Design
and Tolerance Control is achieved by casting using rigid
steel dies. Parts can be cast to size
with excellent dimensional repeatability.
Less
Machining and Second Operations is due to
tighter tolerances. This allows for holes and shapes to be cast ready for
tapping or reaming. Also insert casting is easily accommodated.
Improved
Surface Finish compared with a sand casting is again
due to the steel die providing a superior surface texture. This results in a
reduction in finishing operations or a more aesthetic appearance.