Iterative Upgrades in High-End Hot-Work Mold Materials and Surface Treatment Pro
Die-casting molds are subjected to long-term erosion by high-temperature molten metal and alternating thermal cycles. Thermal fatigue cracking, molten aluminum sticking, and cavity erosion wear are the core pain points restricting mold life. Faced with continuously growing market demand for large, thin-walled, complex die-castings, the industry continues to optimize mold steel smelting, heat treatment processes, and surface strengthening technologies to improve mold reliability and service life in shots.
At the base material level, high-purity hot-work mold steels are being more widely applied. Smelting processes such as electroslag remelting reduce internal impurities and segregation in the material, improve steel toughness and thermal fatigue resistance, and lower the probability of early cracking in large molds during long-term production. For different die-casting conditions of aluminum and magnesium alloys, the industry has begun to implement differentiated steel selection schemes, matching corresponding grades of mold steel and heat treatment parameters according to casting material, die-casting tonnage, and production pace, thereby avoiding premature failure caused by improper material selection.
Surface treatment technology has become a key link in improving mold performance. Processes such as multi-component composite PVD coatings and deep nitriding treatment are continuously iterated and optimized, forming a high-performance protective layer on the cavity working surface. This enhances the mold surface's resistance to high-temperature erosion, sticking, and wear, reduces casting scuffing and surface defects, and simultaneously reduces the frequency of mold polishing and repair. For large integrated die-casting molds, it is also necessary to balance coating adhesion and deformation control to avoid cavity dimensional deviation caused by the coating process.
The coordinated upgrading of materials and processes can effectively extend the service life of die-casting molds and reduce mold replacement costs and downtime for customers. For mass-produced parts such as new energy structural components and energy storage housings, improved mold life can directly improve casting consistency, providing strong support for cost reduction and efficiency improvement in downstream industries.
