Patent ID: 8302275
Filing Date: 2012-11-06
Classification: H02K,Y10T

Abstract:
1. A method of manufacturing an iron core, said method comprising: a thickness measuring step of measuring a thickness of a strip as intermediate product of said iron core with a thickness measuring unit; a strip positioning step of positioning said strip in a widthwise direction thereof by using an inlet guide for mill rolls; a rolling-bending step of performing a rolling-bending process for curvature to said strip fed out of the inlet guide by using said mill rolls; a bending force applying step of, after said rolling-bending process, exerting a bending force for curvature of said strip on an outer edge of said strip with a restraint jig arranged in a direction of the curvature to said strip; a curvature measuring step of measuring the curvature of said strip passing through said restraint jig with a curvature measurement unit after said bending force applying step; an arithmetic operating step of performing an arithmetic operation with an arithmetic operation unit to obtain position control information to be supplied to said inlet guide, a mill roll unit, and said restraint jig, in accordance with changes of the measured thickness of said strip and the measured curvature of said strip, to hold the curvature of said strip uniform; and a position control step of controlling a position of said inlet guide in a direction parallel to axes of said mill rolls and a space between said mill rolls to adjust an amount of rolling-bending, and controlling a position of said restraint jig to adjust the bending force to the strip, based on the position control information of said arithmetic operation unit so as to hold the curvature of said strip uniform by said rolling-bending; step and said bending force applying step.