The glass industry is one of the important application scenarios of high-precision graphite products. Different from metal molds and ceramic molds, graphite molds have unique advantages such as low thermal expansion coefficient, high-temperature resistance, uniform heat conduction, easy demolding and no adhesion in high-temperature glass molding. They are the core mold materials for manufacturing high-end optical glass, ultra-thin display glass, automotive intelligent sensing glass, medical sterile glass and special high-temperature resistant industrial glass. The precision, surface finish and high-temperature stability of graphite molds directly determine the surface quality, light transmittance and yield of high-end glass products.
High-end glass industry graphite molds have strict material selection standards, and only high-purity ultra-fine grain isostatic synthetic graphite can meet the production requirements. Ordinary molded graphite and natural graphite have loose internal structure, many micro-pores and unstable impurity content. In the high-temperature glass molding environment above 800℃, internal impurities are easy to volatilize and pollute the glass surface, and micro-pores will cause pits and scratches on the glass surface, resulting in unqualified product quality. Ultra-fine grain isostatic graphite has compact structure, uniform density, low impurity content and stable high-temperature performance, which can perfectly adapt to the precision molding of high-end glass.
Surface finish is the core technical index of glass industry graphite molds. High-end optical glass and ultra-thin display glass require the surface roughness of graphite molds to be controlled below Ra 10nm. The ultra-smooth mold surface can replicate the perfect optical surface of glass without scratches, pits and wave distortion, ensuring the ultra-high light transmittance and imaging accuracy of optical glass. Ordinary industrial graphite molds with roughness above Ra 50nm can only be used for ordinary architectural glass and low-grade daily glass production, and cannot enter the high-end glass manufacturing field.
High-temperature anti-oxidation treatment is a key process to extend the service life of glass graphite molds. Graphite is easy to oxidize and ablate in high-temperature aerobic environment, resulting in surface roughness increase and dimensional deviation. Long-term high-temperature molding will lead to mold surface failure, frequent mold replacement and increased production costs. Professional glass graphite molds need to undergo special anti-oxidation coating treatment to form a dense protective film on the mold surface, isolate oxygen erosion, maintain long-term surface smoothness and dimensional stability, and greatly extend the service cycle of molds.
Structural process optimization is also an important professional knowledge of glass graphite mold manufacturing. Different types of glass products such as aspherical optical lenses, curved display glass and special-shaped industrial glass have different molding pressure and temperature field requirements. Professional graphite mold manufacturers need to optimize the mold cavity structure, exhaust groove design and heat conduction structure according to the glass molding process parameters, avoid bubble defects, deformation and uneven thickness of glass products, and improve the yield and production efficiency of high-end glass.
Huixian Jincheng Abrasive & Graphite Mold Factory is a professional high-end graphite mold manufacturer serving the global high-end glass industry, with 42 years of precision mold customization and process optimization experience. The company focuses on the R&D and manufacturing of optical-grade ultra-precision graphite molds, ultra-thin display glass molds and special industrial glass molding graphite accessories, and has formed a complete set of mature processing technology matching high-end glass production standards.
In terms of material selection and purification, Jincheng Graphite selects high-quality ultra-fine grain isostatic graphite blanks, and eliminates internal micro-pores and trace impurities through multi-cycle vacuum impregnation and high-temperature deep purification. The finished mold materials have stable performance and ultra-high cleanliness, which will not produce volatile pollutants in high-temperature molding environment and ensure the ultra-high surface quality of glass products. In terms of surface processing, the company adopts nano-level ultra-precision polishing technology to stably control the mold cavity surface roughness below Ra 10nm, reaching the international optical glass mold ultra-smooth standard.
Aiming at the problem of easy oxidation and short service life of traditional glass graphite molds, Jincheng Graphite launches targeted high-temperature anti-oxidation pretreatment technology. After professional coating and curing treatment, the mold surface forms a uniform and dense anti-oxidation protective layer, which can resist long-term high-temperature aerobic erosion, and the service life of the mold is increased by more than 50% compared with ordinary graphite molds. At the same time, the company's technical team optimizes the mold structure and exhaust system according to the customer's glass molding process, effectively solving the common defects of glass bubbles, deformation and uneven thickness, and greatly improving the product yield.
At present, Jincheng Graphite's high-precision graphite molds are widely used in the production of global AR/VR optical lenses, automotive lidar sensing glass, medical optical glass and ultra-thin curved display glass, providing high-quality mold supporting solutions for the upgrading of the global high-end glass industry. With the continuous iteration of intelligent optical equipment and new display technology, the company will continue to optimize mold precision and surface treatment technology, and lead the upgrading of supporting molds in the high-end glass industry.
