Introduction
At first glance, the difference between Die Casting Molds and injection molds seems to be just the materials involved—one uses alloys while the other uses plastics. However, there are more distinctions, as detailed below:
1. Injection Pressure: Die casting molds require higher injection pressure, which places higher demands on the mold plates. The plates need to be relatively thicker to prevent deformation.
2. Gating System: The gating system in die casting molds differs from that in injection molds. Due to the need to decompose high pressure with a runner cone, the design is more complex.
3. Mold Core Treatment: Mold cores in die casting molds do not require quenching, as the high temperature in the mold cavity during die casting effectively acts as a quenching process. In contrast, injection molds typically require quenching treatment.
4. Cavity Surface Treatment: Die casting molds generally undergo nitriding treatment inside the cavity to prevent alloy adhesion to the mold surface.
5. Corrosion Resistance: Die casting molds are more prone to corrosion and are typically treated with a blue finish to improve resistance.
6. Exhaust System: In injection molds, air is typically expelled through ejector pins or parting surfaces. However, die casting molds require dedicated exhaust vents.
7. Material Flow: The alloy in die casting molds has better fluidity compared to plastic in injection molds. This demands higher precision in the fitting of parting surfaces, as high-temperature and high-pressure alloy material leaking from the parting line can be very dangerous.
8. Thermal Expansion: Die casting molds need larger gaps in moving parts compared to injection molds. The high temperatures during die casting cause thermal expansion, and insufficient clearance can result in the mold seizing up.
After reading this, you should have a clearer understanding of the differences between die casting molds and injection molds. For a zinc or aluminum part, explore BOYI’s die casting mold design and manufacturing and share your project requirements using the quotation guide below.
What to Send for a Die Casting Mold Quote
Send your part drawings, intended zinc or aluminum alloy, expected production volume, critical dimensions and surface finish requirements. If you have an existing mold, include the available tooling information and explain what you need to change.
Request a Die Casting Mold Quote