Why Draft Angle in Die Casting is a must. In the process of die casting, having the right draft angle incorporated in die casting molds is a very important thing. It is one of the factors that will affect the total quality of the die casting parts produced.
What is Die Casting Draft angle?
Did you ever notice that the sides of a cupcake pan are sloped in a certain angle towards the center of the pan? If you inspect the pan, the sides are not straight but rather slanted at a certain degree. With that as an example, draft angle in general sense, is an angle integrated into the wall of a mold, making the opening of the cavity a tad wider than its base.
Die Casting draft angle is the angle that is incorporated into the walls of the die casting mold allowing the die casting part to be easily ejected from the mold.
Is draft angle in die casting tooling really necessary?
The rationalization behind the need for draft angels on die casting molds lies from the very nature of the die casting process – injection molding process -and also, the inevitable issue of mold shrinkage.
Die casting manufacturing process for metal parts is done by forcing the molten metal into a mold cavity. These mold cavities are made with hardened tools that have been machined to the net shape of the die casting parts.
The injection of the molten metal into the mold cavities is a high-pressure process. The high pressure forces the molten metal into intimate contact with the walls inside of the mold cavities. The high-pressure packing of the surface of the mold’s cavities makes it hard to get the die casting part out of the mold. In short, the ejection process will be compromised.
With the above explanation, it is clear that draft angle is indeed a must.
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