Die Casting Blog for Cast-Parts Aluminum Die Cast Parts and Zinc Die Cast Parts manufacturing and cast parts production

Importance of Draft Angle in Die Casting Product Design. Die casting, in a nut shell, is a process that involves injecting molten metal into mold cavity at high velocity and high pressure. The metal will take the shape of its mold and then ejected when it’s cooled. One of the factors that sets die casting process like the zinc die casting process apart from other metal casting process is its ability to produce high detailed metal parts with high level of accuracy, repeatedly, in relatively short amount of time hence, it is an industry suited for mass production of metal parts.

One of the key factors that affect the final quality of the produced die casting parts is the design of the mold cavity that is used during the process. It is a tricky job to design molds for die casting parts, especially when they have specific mechanical and aesthetical requirements.

One of the most important and basic requirements of any mold design is the consideration of the draft angle. What is die casting draft angle and why is it important?

Draft angle, in a simple sense, is a slope incorporated on each walls of the die casting mold. Die casting parts will easily stick inside the die casting die or die casting mold if the draft angle incorporated on its side walls was not enough.

Die casting method involves high pressure injection process in which the pressure forces the molten metal on the surface wall of the mold. It creates an intimate contact between the cavities of the mold and the molten metal hence, making it difficult for the metal cast part, when cooled, to eject from the mold.

In the end, no matter how exquisite and well detailed a die casting mold is, if it is not properly incorporated with the proper degree of draft angle, the final product may not most likely be as what the customer has asked for.

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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