发明名称 |
MOLD AND METHOD FOR FORMING THROUGH HOLE |
摘要 |
PROBLEM TO BE SOLVED: To provide a forming technique which enables elimination of a burr on the occasion of forming a through hole. SOLUTION: A gap is provided beforehand between the butting faces of the first and second mold members, allowing for a difference between the amount of thermal expansion of the first and second mold members and that of the rod-like core material at normal temperatures, in a state wherein the fore end face of a rod-like core material fitted to a first mold member is brought into contact with the bottom part of a molding material filling recess of a second mold member. In this constitution, the gap becomes zero due to the amount of thermal expansion at a raised temperature and thus the first and second butting faces are brought into contact with each other. COPYRIGHT: (C)2005,JPO&NCIPI
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申请公布号 |
JP2004358895(A) |
申请公布日期 |
2004.12.24 |
申请号 |
JP20030162274 |
申请日期 |
2003.06.06 |
申请人 |
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO LTD |
发明人 |
GOTO YASUHIRO;SAKAGAMI KEIJI |
分类号 |
B29C33/42;B29C45/26;(IPC1-7):B29C33/42 |
主分类号 |
B29C33/42 |
代理机构 |
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代理人 |
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地址 |
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