Plastic working method and spinning machine used in the same
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United States of America Patent
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Feb 28, 2017
Grant Date -
Aug 27, 2015
app pub date -
May 8, 2015
filing date -
Nov 12, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A spinning machine includes: a main shaft which includes a chuck holding a cylindrical material having a bottom and a regulation member; a mandrel which is inserted inside from an opening side end portion of the material; and a press roller which presses the opening side end portion of the material. The spinning machine molds a circumferential groove portion on the opening side end portion so that an inner diameter of the opening side end portion of the material is smaller than an inner diameter of a body of the material by pushing a press roller while rotating the material around the axial center of the main shaft, and at least a portion of the inserted mandrel is formed so that a gap is provided between the portion and an inner circumferential surface after the opening side end portion of the material is plastically deformed.
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