| 摘要 |
<p>A method is disclosed for producing bodies of revolution having at least one groove or the like which extends substantially in the peripheral direction thereof and whose width, measured in the axial direction of the bodies of revolution, decreases towards the floor of the groove. A blank is rotated about its longitudinal axis while a pressure which exceeds the yield point of the material of the blank is locally applied. In order to permit the groove or the like to be formed in the blank at minimum cost and in order to avoid excessive hardening of the material of the blank during the operation of shaping the same, the width of action of the pressure on the blank is reduced from a maximum width corresponding to the width of the groove to be produced at the peripheral surface of the blank, to the width of the floor of the groove to be produced, in accordance with the progressing depth of impression. The blank is rolled under pressure between ribs on a central roller and ribs and on a counterpressure surface formed in segments. The initial portion of each rib is axially wide but radially shallow and the radial height of the ribs increase while their width decreases.</p> |
