Inner surface regulation tool, plug, mandrel, hot rolling mill, press piercing machine, and drawing machine
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsKouji Yamane, Kazuhiro Shimoda, Tomio Yamakawa, Yuji Inoue
Life of this patent
Estimating the term…
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.
Claims9
An inner surface regulation tool, comprising:
- 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,
- wherein 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, and
- wherein the connection member is a permanent magnet which is attached to at least one of the column-shaped portion and the joining hole, and
- wherein the connection member is fitted to a groove which is formed on at least one of an outer circumferential surface of the column-shaped portion or an inner circumferential surface of the joining hole so that a gap is generated between a surface of the connection member and an opening surface of the groove, or the connection member is fitted to a mounting hole which is formed on at least one of a rear end surface of the column-shaped portion or a bottom surface of the joining hole so that a gap is generated between a surface of the connection member and an opening surface of the mounting hole.
A plug which is detachably connected to a mandrel, comprising:
- a column-shaped portion or a joining hole which extends in an axial direction of the plug;
- and
- a connection member which connects the mandrel and the plug by a magnetic force,
- wherein the connection member is a permanent magnet which is attached to the column-shaped portion or the joining hole, and
- wherein the connection member is fitted to a groove which is formed on at least one of an outer circumferential surface of the column-shaped portion or an inner circumferential surface of the joining hole so that a gap is generated between a surface of the connection member and an opening surface of the groove, or the connection member is fitted to a mounting hole which is formed on at least one of a rear end surface of the column-shaped portion or a bottom surface of the joining hole so that a gap is generated between a surface of the connection member and an opening surface of the mounting hole.
A mandrel which is detachably connected to a plug, comprising:
- a column-shaped portion or a joining hole which extends in an axial direction of the mandrel;
- and
- a connection member which connects the mandrel and the plug by a magnetic force,
- wherein the connection member is a permanent magnet which is attached to the column-shaped portion or the joining hole, and
- wherein the connection member is fitted to a groove which is formed on at least one of an outer circumferential surface of the column-shaped portion or an inner circumferential surface of the joining hole so that a gap is generated between a surface of the connection member and an opening surface of the groove, or the connection member is fitted to a mounting hole which is formed on at least one of a rear end surface of the column-shaped portion or a bottom surface of the joining hole so that a gap is generated between a surface of the connection member and an opening surface of the mounting hole.
Dependencies are inferred from the claim text.