The Design of new underrollers

The dimensions of the rollers are calculated using the Stribeck roller press curve. Be sure to read and follow our separate calculation brochure. For the manufacture of rollers, it makes no difference to the price whether the bore has a small or large internal diameter. We therefore recommend a small bore with a steel bush with a narrow wall thickness.

GESADUR^® WN has a specific gravity of 1.4 g/cm³, compared to 7.8 g/cm³ for steel. This provides a weight saving. The lower price for a smaller steel bush also contributes to the cost savings.
We recommend normalized steel for the steel bush. Cast iron is also used, but this can shrink over time and an interference fit is no longer guaranteed.

To achieve the best concentricity, proceed as follows: finish the steel bush with 20 mm extra length (see Diagramm 01 ). When the steel bush has been pressed in and pinned using the three adapter sleeves, the roller is mounted onto the extra length from outside using the lathe.

The external and internal diameters can be turned in this way in a single mounting process. The extra length is turned off in a separate process; maximum precision of concentricity is 0.01 mm. We recommend that the external diameter (upper or running surface) be turned using a natural diamond, since natural diamonds produce the best accuracy and running surfaces.
Normal carbide tools could wear during fine processing work, causing the roller to be slightly conical.