发明名称 |
Metallic glass fastening screw |
摘要 |
A metallic glass fastening screw that is not susceptible to loosening, and is capable of implementing fastening with high strength and reliability. In processing a screw thread and a screw groove of a screw, amorphous bulk metallic glass is form-rolled at glass transition temperature or less of the bulk metallic glass serving as a member to be processed. The bulk metallic glass has a plastic strain property introduced by plastic working such as form rolling, to improve ductility. A relationship of d>0.022×D is set so that a depth from a bottom of the screw groove in the region where the plastic strain is introduced is d and an outside diameter of the screw is D, to relax stress concentration of tensile stress generated in a region at the bottom of the screw groove due to tension (axial force) applied to the screw in fastening. |
申请公布号 |
US9095890(B2) |
申请公布日期 |
2015.08.04 |
申请号 |
US201013574498 |
申请日期 |
2010.06.22 |
申请人 |
Maruemu Works Co., Ltd.;Tohoku University |
发明人 |
Yamanaka Shigeru;Chatani Masahiro;Saotome Yasunori;Amiya Kenji |
分类号 |
B21H3/02;A61L31/02;C22C45/10;F16B33/00;F16B33/02;C22C1/00;C22C45/00;B21H3/06;F16B35/04 |
主分类号 |
B21H3/02 |
代理机构 |
Oliff PLC |
代理人 |
Oliff PLC |
主权项 |
1. A metallic glass fastening screw comprising:
a thread; a groove; and a plastic strain region disposed near a surface of the screw and being formed through molding amorphous bulk metallic glass by form rolling at a glass transition temperature or less of the bulk metallic glass, wherein the screw satisfies a relationship of d>0.022×D where a depth from a bottom of the groove to the plastic strain region is d, and an outside diameter of the screw is D. |
地址 |
Osaka JP |