Method for manufacturing split bearing ring

A method for manufacturing a split bearing ring, the split bearing ring comprising two or more split portions into which the split bearing ring is divided with respect to a circumferential direction,

• wherein surfaces of the split portions other than end faces of the spit portions with respect to the circumferential direction have hardness of HRC 59 or higher, the surfaces of the split portions other than the end faces with respect to the circumferential direction are quenched and tempered, and the surfaces of the split portions other than the end faces with respect to the circumferential direction have a prior austenite grain size of No. 6 or above according to JIS G0551, and
• wherein the method comprises:
• inserting a support jig into a radially inner side of a bearing ring;
• and
• splitting the bearing ring to form the split portions by applying a load to the bearing ring such that stress generated on one end side of the bearing ring with respect to an axial direction of the bearing ring is larger than stress generated on the other end side of the bearing ring with respect to the axial direction,
• wherein the load is applied to both axial sides of the bearing ring in a vertical direction with respect to the axial direction.