WEISSER whirling for highly productive turn-milling of cylindrical roller bearing cages and shaft-hub connections. Based on counter-spindle kinematics, special shapes, such as rectangular pocket windows, can be incorporated into workpieces with this procedure, which has been further developed by WEISSER.
Compared to the milling of bearing cages, which are typically made of brass, shorter cycle times and tribological matched contours with greater precision can be achieved for cylindrical roller bearings.
The shape of the cage bars is controllable by the whirling method, which allows perfect osculation of the rolling elements to the cage. The rolling elements do not need be mounted and fixed in a time-consuming way, but can be clipped into the cage by simple snap-in assembly.
Whirling or impact/turn-milled brass or steel cages are perfect for heavy-duty bearings and therefore are particularly useful in:
- Planetary gearboxes and heavy-duty wind-power planetary gears
- Railway axles and construction equipment, such as cranes or excavators vehicles
This method is not only useful for incorporating radial pockets in cage rings, but also for generating, for example, the following geometries:
- Positive fitting shaft hub profiles (spur gearing)
- Coupling profiles (positive fitting), such as claw and tooth clutches
- Cycloid pockets and recesses for weight reduction
The WEISSER whirling method offers these unique user benefits:
- High efficiency due to the substitution of time-consuming and expensive manufacturing processes, such as milling, drilling and broaching or boring and punching
- Improved contact conditions between roller and cage bar with the new concave pocket-window geometry
- Ideal lubricant film formation in the rolling region with less wear
- Self-retaining function of the rolling elements due to concave ridge forms: Facilitated assembly due to snap-in assembly of the rollers without a separate device or caulking to prevent falling out
The method also allows efficient machining of stable full-mould cage forms so that they can be used instead of sheet-metal cages. This results in
- Greater solidity and durability in spite of a reduced overall mass, thereby reducing inertia forces in operation
- Increase of the static as well as dynamic load rating and service life due to the machining options for solid components
- Counter-spindle principle
- Substitution of milling processes
- New, concave pocket window geometry