Inner surface regulation tool, plug, mandrel, hot rolling mill, press piercing machine, and drawing machine
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United States of America Patent
Stats
-
Nov 8, 2016
Grant Date -
Nov 5, 2015
app pub date -
Aug 22, 2013
filing date -
Aug 24, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An inner surface regulation tool includes a mandrel, a plug which is detachably connected to the mandrel, and a connection member which connects the plug and the mandrel by a magnetic force. One of the plug and the mandrel includes a column-shaped portion which extends in an axial direction of the one, and the other of the plug and the mandrel includes a joining hole which extends in an axial direction of the other and into which the column-shaped portion is inserted. In addition, the connection member is a permanent magnet which is attached to at least one of the column-shaped portion and the joining hole.
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