Metal deforming – By use of tool acting during relative rotation between tool... – With modification or control of temperature of work – tool or...
Patent
1998-11-17
2000-06-20
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
With modification or control of temperature of work, tool or...
2989332, 72 84, B21H 504
Patent
active
060763876
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method of and tool system for ring rolling or roll forming teeth of bevel gears.
BACKGROUND OF THE INVENTION
The standard method of ring rolling teeth of bevel gears with hypoid toothings normally starts with a pretreated blank whose shape outside the region to be deformed by profiled tools already corresponds to the desired finished shape. Prior to the rolling the region to be deformed is heated and then the profiled tool together with at least one synchronously rotating clamping device are positioned to form a closed cavity around the heated region to be deformed of the workpiece. The deformation takes place between two rotating tools and the angled upper tool is advanced along its symmetry line during the rolling.
The tool system for carrying out this method comprises two rotating tools that are inclined relative to each according to the shapes of the bevel gears to be produced. The upper profiled tool is advanced axially in a direction along its symmetry line and the region of the workpiece to be shaped during the rolling process is held in a closed cavity that is formed by the upper profiled tool and at least one synchronously rotating clamping device.
German 3,526,796 describes a method wherein workpieces are produced by advancing the upper tool in the direction of the fixed angle set in the machine of the hole upper tool. Naturally there is no means for adjusting the angle of inclination. The radial limits of the material flow are defined by fixedly connected clamping elements. Synchronization of the tools' rotations is ensured by toothed synchronizers near the tools, the gears being adjusted under load according to the roller advance, a process that obviously is subject to considerable wear.
German 2,611,568 furthermore shows a method of making annular workpieces with highly profiled sections and a roller tool to carry out the method, where two relatively adjustable rollers set at a fixed angle to each other and of which at least one is driven to produce the negative of the profile to be rolled. The angle is fixed by the machine and naturally there is no system for adjusting the angle of inclination. With this so-called axial die rolling there is above all no production of a tangential profiling on the back side of the workpiece and there is naturally no profiling corresponding to the tools as well as clamping device and kinematic coupling of the tools.
German 1,812,423 also describes a machine for rolling or roll-hobbing teeth in bevel gears where the toothed roller tool is fixed on a steppedly advanced spindle that works together with a spindle carrying the workpiece blank and in which one of the spindles is pivoted on a link whose axis is perpendicular to a plane that extends through the spindle axes.
OBJECTS OF THE INVENTION
It is an object of the invention to produce a method of this type and an apparatus for carrying out this method where the plastic deformation of the profile to be produced, in particular in the edges or corners of the teeth, is improved and the cycling time is reduced.
SUMMARY OF THE INVENTION
This object is attained according to the invention in a method of ring rolling teeth of bevel gears in a closed die formed between upper and lower clamping elements wherein the 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 work piece and deformation takes place between the rotating tools, and the angled upper tool is advanced along its symmetry line into the work piece as the workpiece is deformed. In accordance with the invention the upper clamping element is axiall
REFERENCES:
patent: 1377177 (1921-05-01), Anderson
patent: 1817035 (1931-08-01), Hughes
Sczesny Werner
Siewert Frank
Dubno Herbert
Larson Lowell A.
WDB Ringwalztechnik GmbH
Wilford Andrew
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