| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a rolling bearing cage with a specified wall thickness from a steel plate with a thicker plate thickness than the specified wall thickness. SOLUTION: A punched plate 21 of 2.9 mm in plate thickness discharged in a process of manufacturing a large-sized tapered roller bearing cage 10 is used as a blank, and the plate thickness is thinned by an ironing-spinning method to manufacture a tapered roller bearing cage 20 of 2.0 mm in wall thickness smaller than the tapered roller bearing cage 10. In this case, a wall thickness decrease rate ηis 31.0%. |
