Mold

As a core process tool in modern industrial production, molds are a critical enabler for achieving large-scale, standardized manufacturing. By shaping raw materials such as metals, plastics, and rubber into components that meet design specifications, molds are widely used across numerous sectors, including automotive manufacturing, electronics and electrical appliances, medical devices, and aerospace. The precision of mold design directly impacts the quality of the finished product, while the level of mold manufacturing determines production efficiency and cost‑control capabilities; hence, molds are often referred to as the “mother of industry.” Structurally, a mold typically consists of two main parts—the moving half and the fixed half—positioned and opened/closed with precise alignment provided by guide posts and bushings. Key components include the cavity, the core, the gating system, the cooling system, and the ejector mechanism. The surface roughness of both the cavity and the core must be kept below Ra 0.8 μm to ensure a smooth product finish; the design of cooling channels must balance cooling efficiency with uniform temperature distribution, thereby influencing the molding cycle; and the layout of the ejector system should guarantee even stress distribution during demolding, preventing deformation or damage. Mold manufacturing involves multidisciplinary technologies, spanning mechanical machining, heat treatment, electrical discharge machining, CNC programming, and more. High‑precision equipment, such as five‑axis machining centers and wire EDM machines, enables cavity tolerances as tight as ±0.005 mm. Heat‑treatment processes—including quenching and tempering—can raise the hardness of mold steels to HRC 50–55 while maintaining excellent toughness. Surface‑treatment techniques like nitriding or PVD coating further enhance wear resistance and corrosion resistance. With the advancement of smart manufacturing, the mold industry is progressively adopting digital design, 3D printing, and intelligent inspection technologies, driving a transformation from traditional to precision manufacturing. Depending on the material and process involved, molds can be categorized into metal die‑casting molds, plastic injection molds, rubber vulcanization molds, powder metallurgy molds, and others. Among these, plastic injection molds account for over 60% of applications, making them the most widely used type. The automotive sector exhibits particularly strong demand, with each vehicle requiring approximately 1,500 sets of molds covering interior and exterior trim, engine components, chassis systems, and more. Meanwhile, the electronics and electrical appliance industries have a robust need for miniature, high‑precision molds; for instance, the dimensional accuracy of cavities in smartphone connector molds must be maintained within ±0.002 mm. The mold industry is characterized by the typical “three highs”: high technological content, high added value, and high industrial linkage. A high‑quality mold can endure more than 500,000 cycles, with its value often exceeding that of the final product by several orders of magnitude. The global mold market has surpassed US$120 billion, with China—its largest producer—accounting for roughly 30% of the market share; however, the country remains reliant on imports for high‑end molds. As China advances its “Made in China 2025” strategy, the mold industry is evolving toward greater precision, intelligence, and sustainability, providing crucial support for the transformation and upgrading of the broader manufacturing sector.