Mold development, or mold making, is the process of transforming a product design into a physical production tool. The entire process is interconnected and can be broadly divided into the following stages:
Product Analysis and Design Confirmation
This is the starting point for all work. The mold manufacturer needs to communicate thoroughly with the client to fully understand the product's functions, appearance requirements, materials used (such as PP, ABS, PS, etc.), and expected production volume. The key is to conduct a manufacturability analysis of the product, such as checking for undercuts that make demolding difficult, whether the wall thickness is uniform, and whether reinforcing ribs are needed to prevent deformation. The goal of this stage is to ensure that the product design itself is suitable for efficient production through mold making, avoiding carrying design defects into later stages and causing huge modification costs.
Mold Design
After confirming the product's 3D data, the mold designer begins their work. This is not just about replicating the product shape, but about conceiving how to "disassemble" the product so that it can be smoothly formed and removed from the steel. The main tasks include:
Parting Surface Design
Determining where the mold separates is the core concept of the mold, directly affecting the product's appearance (whether there will be molding lines) and the ease of demolding.
Cavity and Core Design: These form the outer shape and internal cavity of the product.
Gating System Design: This design determines the channels (runners, gates) through which molten plastic flows into the cavity. Its quality directly impacts the filling quality, appearance, and production efficiency.
Cooling System Design: This design incorporates water channels within the mold platen for rapid cooling of the plastic, shortening the molding cycle. This is crucial for production efficiency.
Ejection System Design: This plan outlines how the cooled product will be smoothly ejected from the mold.
Ventilation System Design: This system removes air from the cavity during plastic filling, preventing scorching or material shortage defects in the product.
After mold design is completed, mold flow analysis is typically performed. Computer simulations of the plastic's filling, holding, and cooling processes within the mold are used to predict and optimize for potential defects.
