Integrated molding method for the front fork of a bicycle
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United States of America Patent
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-
Apr 18, 2000
Grant Date -
N/A
app pub date -
May 22, 1998
filing date -
May 22, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An integrate forming method for a front aluminum alloy fork of a bicycle, wherein, an aluminum alloy found round pipe having two elliptical pipe holes therein is selected as a blank and is formed an embryonic form of a pipe casting of the pipe head of the front fork by a milling process, then die cores are placed in the pipe casting then by using a sequential novel process including diameter reducing and tapering of the pipe head, a first stage forming, tapering of the branch pipes, a second stage forming, and bending forging etc., the front aluminum alloy fork can be integrately formed, in this way, the pipe head and the two branch pipes having extremely large variation of shape can be integrately formed, and the disadvantage of stress concentration in the conventional connecting and fixing technique can be gotten rid of, and good appearance as well as strength of the front fork can be improved by such a process.
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