发明名称 |
Schraube mit mehreren Gewindesteigungen, Verfahren und Vorrichtung zum Herstellen einer Schraube mit mehreren Gewindesteigungen |
摘要 |
To present a method of manufacturing a multipitch screw easily by using flat dies suited to mass production. A flat die 4 includes linear ordinary screw threads 40 a, and multipitch screw threads 40 b consecutive to the ordinary screw threads 40 a, slightly shorter in height than the ordinary screw threads 40 a, with both side walls formed alternately and consecutively, alternating between a section departing from the central line 40 c of screw threads and an approaching section along a central line 40 c, and symmetrically to the central line 40 c of screw threads. After forming the tacks of a constant lead angle screw on the outer circumference of a shaft-like blank piece by the ordinary screw threads 40 a, tracks of a multipitch screw are formed by the multipitch screw threads 40 b, and therefore the tracks of a multipitch screw varying in the force applied at the time of rolling can be formed easily. |
申请公布号 |
DE112005002820(T5) |
申请公布日期 |
2007.10.04 |
申请号 |
DE20051102820T |
申请日期 |
2005.11.07 |
申请人 |
NAGOYA INDUSTRIAL SCIENCE RESEARCH INSTITUTE, NAGOYA |
发明人 |
FUJI, HIROSHI;SASE, NAOKI;KATAYAMA, KENICHI;MORIGUCHI, YOSHINORI |
分类号 |
B21H3/06;F16B39/30 |
主分类号 |
B21H3/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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