| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of treating a ring-like roughly shaped material comprising a treatment condition for suppressing or closing an inner air gap generated in a ring in hot ring rolling processing. <P>SOLUTION: In this method of manufacturing the ring-like roughly shaped material by hot ring rolling processing, when showing the constitution of the ring rolling in three dimensions comprising X-axis and Y-axis directions and a Z-axis direction, a main spindle 2 of a ring rolling machine is inclined at the same angle symmetrically with respect to the Y-axis to install pressurization parts 4 of two main rolls 3, 3 to abut on each other to form a V-shape having a fixed angle, and a steel material ring 12 is inserted to a caliber 8 between an outer peripheral face 5 of the pressurization part 4 and an outer peripheral face 7 of a mandrel 6. A value of f/V which is a ratio of peripheral speed V of the two main rolls 3, 3 with respect to reduction speed f of the mandrel 6 is controlled to be in a fixed range. By pressing force of the main rolls 3, 3 with respect to an outer face 9 and a lateral face 10 of the caliber 8 and reaction force of the outer peripheral face 7 of the mandrel 6 to an inner face 11 of the caliber 8, reduction of an outer peripheral face 13 of the steel material ring 12 is performed. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
