Why is it important to check on draft angles?

- Sep 14, 2017-

What is a Die Casting Draft Angle and Why is it Important? Hundred million tons of metal products, precision metals and metal parts are produced each year. The aluminum die casting industries contribute a massive volume of these metals through the application of advanced technologies and methodologies. This includes giving importance to applying the right Die Casting Draft Angle in producing optimum quality and high volume metals parts.

Draft Angle is an important requirement in the die casting process. It is described as an angle or amount of slope that is incorporated into a wall of a die casting mold making the opening of the die cavity wider than its base. It is also known as the draft.

Die casting molds with surfaces perpendicular to the direction of ejection can damage the product and the mold. The metal formed will stick to the mold and an ejection by force and pressure causing an immeasurable damage. Additional cost will be incurred to produce another mold if it is reusable. Hence, a small angle must be applied I all surfaces.

During the cooling process, the castings will shrink towards the core at an acceptable rate. This is the reason why drafts are higher on the inner surfaces of the die. To avoid high pressure in castings, the inside corners must be protected with fillets.

The die cast Draft Angle requirement varies with the specific surface, the depth of the surface and the kind of alloy used in casting. To facilitate the ejection of die castings, the surfaces of the angle must be specified.

Because of the importance of Draft Angles in in aluminum die casting, Die Casting Manufacturing Companies employ specialists to give due consideration to such dimensional factors.