| 摘要 |
The process of the invention is designed for producing wheel rims having a snap-in groove on one side of the rim, in which a blank having an inner coned part for forming the eventual wall of the snap-in groove in the completed wheel rim and with an outer cylindrical part joined up with the smaller end of the coned part is formed on a spinning lathe using spinning rollers by outwardly bending and flaring the outer cylindrical part. In the process the blank is slipped onto a mandril which has a coned outer face to be in line with the coned form of the blank, while the outer cylindrical part of the blank stationarily extends out beyond the end of the mandril. Then the blank is gripped with an outer chuck and then at least one spinning roller, conforming to the desired form to be produced, is moved axially up against the end of the blank overlapping the mandril so that, while causing axial upsetting of the blank, the outer cylindrical part is bent outwards against the outer chuck for forming the outer wall of the snap-in groove.
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