Defining functionality is another core mechanism of mold making. The mold parting line is not a process defect, but rather a physical record of the material phase transformation process. The microscopic gap formed when the two mold halves close actually constitutes the cutting-off boundary of the material flow front. Metal die-casting molds, through surface nitriding treatment to form a hard layer, not only improve wear resistance but, more importantly, provide a non-wetting interface for the molten metal, ensuring complete separation of material boundaries during demolding. Silicone molds utilize elastic deformation to release the undercut structure, demonstrating the complementarity of rigid and elastic boundaries in molding.
The balance between molding efficiency and precision is achieved through the mold's temperature modulation system. High-gloss molds employ variable temperature technology, maintaining high temperatures during the filling stage to reduce flow marks and rapidly cooling during the cooling stage to shorten the cycle time. This dynamic temperature control not only improves surface quality but also affects the product's mechanical properties by altering crystallinity. The flow channel arrangement of multi-cavity molds is optimized through fluid simulation to ensure that each cavity is filled at the same pressure simultaneously, enabling the performance consistency of batch products to reach the material property limits.