Invention Grant
- Patent Title: Die for press forming of glass and manufacturing method thereof
- Patent Title (中): 玻璃冲压成型用模具及其制造方法
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Application No.: US11573501Application Date: 2006-05-11
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Publication No.: US08206518B2Publication Date: 2012-06-26
- Inventor: Jun Masuda
- Applicant: Jun Masuda
- Applicant Address: JP Tokyo
- Assignee: Toshiba Kakai Kabushiki Kaisha
- Current Assignee: Toshiba Kakai Kabushiki Kaisha
- Current Assignee Address: JP Tokyo
- Agency: DLA Piper LLP (US)
- Priority: JP2005-185052 20050624
- International Application: PCT/JP2006/309478 WO 20060511
- International Announcement: WO2006/137225 WO 20061228
- Main IPC: C21D1/00
- IPC: C21D1/00 ; C22C38/18

Abstract:
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 Ni3P. 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.
Public/Granted literature
- US20090178737A1 DIE FOR PRESS FORMING OF GLASS AND MANUFACTURING METHOD THEREOF Public/Granted day:2009-07-16
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