Field of Research
Gear Quality and Material Properties


Gear Quality and Material Properties

The functionality and capability of a component are defined by it’s characteristics. Macroscopic properties of the component as well as microscopic properties of the component topography are just as significant as the mechanical properties of the surface zone concerning the hardness, ductility and residual stress of the material. This applies especially for the contact zones of the tooth flanks under rolling stress and the area of the gear base under bending stress.
Selective dimensioning of the component for a specific application builds the basics of accomplishing the purpose of the component, with regards to the load carrying capacity and operative behaviour. It is to be ensured that the geometry and surface condition of the component comply with the required tolerances, so that the operative demands on the component are satisfied. Furthermore, mainly responsible for the durability of a component is (beneath a microstructure which is homogeneous and consists only of error-free material) a sufficient material quality at the heavily used peripheral zones of the tooth flanks. This leads to an ever increasing usage of additional tests to measure residual stress, material hardness, as well as use of X-ray diffraction analysis.
For the verification of the component geometry and topography it is possible to specify the gearing quality, the surface structure and the surface roughness. To analyse the quality of the material there are several methods available besides the classical analysis methods for measurement of hardness, metallography, light and scanning electron microscopy and surface zone analysis by X-ray diffraction as well as micro magnetic measurement of the Barkhausen Noise Analysis (BNA) and the natal etching procedure to detect grinding burn.



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