Patent ID: 6076387
Filing Date: 2000-06-20
Classification: B21H,B21J,B21K,Y10T

Abstract:
In a method of ring rolling teeth of bevel gears in a closed die formed between upper and lower clamping elements whereinthe starting workpiece is a pretreated blank whose shape outside a region to be deformed by upper and lower profiled tools already corresponds generally to a desired finished shape;prior to rolling the region to be deformed is heated;the upper profiled tool together with the upper synchronously rotating clamping element form a closed cavity around the heated region to be deformed of the workpiece with the upper tool angled relative to the workpiece;the tools and elements are rotated while engaging the workpiece and deformation takes place between the rotating tools; andthe angled upper tool is advanced along its symmetry line into the workpiece as the workpiece is deformed, the improvement comprising the step whereinthe upper clamping element is axially retracted opposite to the upper tool and away from the workpiece during the rolling process along the symmetry line of the upper profiled tool as the workpiece is deformed.