Abstract
This study was an attempt to study the wear calculation method for rotating shaft in the friction couple type in conditions of oiling in high dusty environment. The size and quantity of abrasive particles that go into the clearance between friction surfaces, definition of the pressure including the load in conjugate that is given by the cuff spring as the radial force, and the effected contact area including the micro hardness of the shaft surface (taking into account the influence of the finishing treatment as a diamond pressing) have been calculated by utilization of above mentioned method. Furthermore, the volume wear has been calculated by the energy of friction including both the factor of energy transition to heat and the latent melting heat of shaft material. In this study the experimental scheme for wear testing of steel shaft in the friction couple type shaft-cuff and the theoretical and experimental results have been given, Fig. 4. It has proved that this method permits to choose the effective materials for parts making and the use of effective finishing treatment. Morethan, it permits to choose optimum properties of the parts surface layer. This may be attained on the stage of designing- to prognosis shaft and couple friction conjugates wear. Therefore, this method provides a maximum wear resistance and the ability to calculate parts life before damage.
Highlights
In conditions of high dusty environment the majority of the friction assemblies in machines working with oil containing the abrasive particles go into the conjugate of friction couples
The method of generating wear resistant surfaces based on advantages of some events accompanying high temperature wear such as oxidation, debris generation and elemental transfer between the contacting surfaces[1,2,3,4,5,6,7]
It is obvious that approximately experimental and theoretical results are identical. This means that the suggested calculation method can be utilized in the wear calculation for such friction couples and in the calculation of the resource of friction assembles before their damage
Summary
In conditions of high dusty environment the majority of the friction assemblies in machines working with oil containing the abrasive particles go into the conjugate of friction couples. To calculate the abrasive wear it is necessary to know the sizes, quantity of particles being at the same time in the clearance between friction surfaces, definition of the pressure and effected area. The quantity of the abrasive particles passed through the clearance per revolution of the assembly can be defined as follows: na. K2 =0.75-0.95, is the factor that considers the quantity of particles in oil, hardness of which exceeds the hardness of the friction surfaces[18]. Depending on the normal load applied to one of the abrasive particles, depth of the abrasive particle, indentation on the shaft surface is defined by the equation:. The volume of the abrasive particle indentation on the shaft surface taking it as the spherical segment can be defined by the equation:. Radius of contact area (Fig. 2) can be defined by the equation:. The contact area in the elastic deformation is defined by the equation:
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