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Download Grind Hardening Process by Konstantinos Salonitis (auth.) PDF

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By Konstantinos Salonitis (auth.)

This ebook provides the grind-hardening approach and the most reviews released because it used to be brought in Nineteen Nineties. The modelling of some of the elements of the method, similar to the method forces, temperature profile built, hardness profiles, residual stresses and so on. are defined intimately. The ebook is of curiosity to the study group operating with mathematical modeling and optimization of producing processes.

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29) where de is the equivalent diameter and ae is the depth of cut. However, the ­geometric contact length is an underestimation of the real contact length. The shape of the contact area is deformed, due to the elastic and plastic behaviour of the wheel and the workpiece system. Experimentally, it has been shown that the actual contact length can be 50–200 % greater than the geometrical contact length [14, 15]. For the purposes of the present work though, the geometrical contact length will be used, since no analytical expressions of the actual contact length have been derived for the case of high material removal rate grinding processes such as the grind hardening.

8 Forces ratio dependence on depth of cut and workpiece speed (based on [2]) sliding is more dominant then μ will have more dominance grinding force ratio [8]. Therefore, for the case of grind hardening it is safe to assume that the force ratio equals the friction coefficient. Salonitis et al. [2] derived both theoretically and experimentally that force exerted due to chip forming and plowing is negligible (less than 3 % of the total forces) in comparison to the sliding force, supporting further the validity of the assumption to use the force ratio for assessing the friction coefficient.

The preference to corundum wheels is due to their lower heat conductivity, allowing thus for more heat to directed in the workpiece material. Most of the researchers are using fine-grained, resin-bonded corundum wheels of high bond hardness and closed structure. Salonitis et al. documented the effect of the corundum grinding wheel specifications (grain size, hardness and structure) on process forces [29] and hardness penetration depth [30]. Utilization of softer wheels was shown to result in reduced process forces since grain and bonding fracture occurs more easily, and consequently, fewer grains interact with the grinding wheel.

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