How to Create Molds for Compression Molding?

Depending on the material or charge you will be compression molding, you have several options for creating molds. The key is that your molds need to be able to withstand the compression molding process, so if you are using heat, you will need to create molds that can handle dramatic temperature changes. Molds will also need to be able to withstand the amount of pressure applied during compression.

Die casting is one of the most popular ways to create molds for compression molding as well as other methods of manufacturing. Die casting remains a top choice because it delivers durable metal parts at a more affordable cost than alternative manufacturing methods. It should be noted that the dies for die casting are often made using CNC machining, and these two manufacturing methods often go hand-in-hand.

CNC machining is an optimal choice for more detailed compression molds. The computerized component of CNC machining gives engineers more control over design; however, it can be expensive for creating tooling. Some manufacturers will use a combination of die casting, followed by CNC machining to produce molds that are more cost-effective.

Tooling for compression molding can also be made using 3D printing. If you are prototyping smaller parts, 3D printing may be the cheapest and fastest method for creating molds. Multiple iterations can be made quickly with CAD software, reprinted, and then tested. 3D printing is most commonly used for compression molds intended for heatless applications.