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    • 42. 发明公开
    • METAL MOLD FOR GLASS SHAPING AND PROCESS FOR PRODUCING THE SAME
    • METALLFORM ZUM FORMEN VON GLAS U​​ND HERSTELLUNGSVERFAHRENDAFÜR
    • EP1894895A1
    • 2008-03-05
    • EP06746287.9
    • 2006-05-11
    • Toshiba Kikai Kabushiki Kaisha
    • MASUDA, Jun, c/o Toshiba Kikai Kabushiki
    • C03B11/00C23C18/32
    • C03B11/086C03B2215/11C03B2215/16C23C18/1692C23C18/32C23C26/00
    • The present invention is directed to provide a method for manufacturing a die for press forming of glass in which cracks are not easily caused in a surface covering layer. A surface covering layer made of an amorphous Ni-P alloy is formed on the surface of a base material made of a steel having a martensitic structure or made of steel in which ε-carbide is dispersed in low carbon martensite matrix. Then, the base material and the surface covering layer are heated to change the base material into a troostitic structure or a sorbitic structure and change the surface covering layer into a eutectic structure of Ni and Ni 3 P. Preferably, the base material contains 0.3 wt% or more and 2.7 wt% or less of carbon and 13 wt% or less of chromium, and the heat treatment is carried out at 270°C or more.
    • 本发明旨在提供一种在表面覆盖层中不容易引起裂纹的玻璃的压制成形用模具的制造方法。 在具有马氏体结构的钢或由碳化物分散在低碳马氏体基体中的钢制成的基材的表面上形成由非晶质Ni-P合金构成的表面被覆层。 然后,对基材和表面被覆层进行加热,将基材改性成为耐火组织结构或山梨糖体结构,将表面被覆层变为Ni,Ni 3 P的共晶组织。优选的是,基材含有0.3重量% %以上且2.7重量%以下的碳和13重量%以下的铬,并且在270℃以上进行热处理。