| 摘要 |
PURPOSE: A molding method for an injection pipe is provided to keep the hardness of a head portion similarly to a pipe portion after a cold-rolling press work by forming a slant face on an end of the pipe from the beginning. CONSTITUTION: An end of a pipe prepared with an injection route is cut by a lathe according to the shape of a head so that a slant face of the pipe is formed. After the pipe is fixed on a fixing stand, the end of the pipe is cold-rolling pressed by a press die having a protrusion on a mold portion. A head prepared with a recessed portion in a circular shape on the surface is made up. A narrow injection route of the head and a crack are ground by a reamer or a drill to equal a diameter to that of the injection route of an original pipe. Then, a completed product is obtained by performing a polishing process.
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