Question

Why do we use angled drafts in casting

Answer 1

Casting is defined as, an object or machinery which is made by pouring liquid or molten hot metal into a container, so that when it cools down, it hardens and takes the required shape.

Angled Draft is generally applied in Die Casting process and it plays a major role /aspect of die casting.

What is Angled Draft?

It s defined as an angle or slope that is incorporated into wall of casting mold surface making the opening of cast wider than its base.

Why use Angled Daft?

1. Die casting models with surfaces of mold perpendicular to the direction of ejection can damage the product or mold or Both, so we use angled draft.

2. The metal formed will stick to mold and an ejection by force or pressure can cause an immeasurable damage if draft is missing.

3. During the cooling phase, casting will shrink towards the core region at higher Rate, so we use angle/drafts of higher value on inner side. This helps in easier or smooth ejection of die casting.

4. Angled draft also helps in reducing overall cooling time by decreasing or eliminating the need for unconventional ejection set ups.

5. We know that every thermoplastic shrink while they cool down, which creates a massive amount of surface tension, thus preventing the part from releasing cleanly during ejection. This tension creates small scratches in polished surface. So to avoid this, we incorporate angled draft.