Glass Mould is the main manufacturing equipment of glasswork, classified into two kinds, bottle glass mould and vessel glass mould. During the operation, the intra-cavity of mould determines the surface quality and production efficiency of glassworks. Therefore, high requirements are set on the accuracy and finishing of cavity. Due to the frequent contact with 700 ℃~ 1100 ℃ melting glass, glass mould is in face of oxygenization and thermal fatigue, etc. Meanwhile, the contact with glassworks aggravates problems of wear. Thus, mould materials are required to have excellent performance in thermal-resistance, wear resistance, corrosion resistance, as well as oxidation and growth and thermal resistance. Among them, the oxidation resistance is the most important index. In addition, mould material should also be compact, easy-processing, and in possession of small thermal expansion coefficient.
Thermal expansion coefficient is a physical quantity to reflect thermal-transfer capability of the materials. While in use of glass mould, melt glass is dripped down into mould intra-cavity with a temperature of 1100 ℃ and took out with 780 ℃. For this reason, the temperature of mould should cool down to under 780 ℃ as soon as possible to improve the production efficiency.
Common materials used to make glass mould are heat-resistant cast iron, stainless steel and thermal-resistant alloy steel.
