OPERATIONAL EVALUATION OF CYCLIC DURABILITY OF HARDENED PARTS OF MACHINES
Abstract
Operational experience and analysis of the destruction of surface hardened parts of machines shows that one of the main directions of preventing the destruction of structural elements is their design and manufacturing with the corresponding values of bearing capacity. This can be achieved by improving the calculation methods for strength and durability. If the constructor in the strength calculations can apply the recommended analytical methods for determining the endurance end of the surface-hardened parts of machines, then in his lifetime calculations he faces difficulties due to the lack of data on the location of the inclination of the section of the fatigue curve. The construction of the fatigue curves for each particular case experimentally by the classical method is cumbersome and costly, and most often it is impossible and unacceptable.
Features of the assessment of the cyclic durability of machine parts are considered. The possibility of differentiating the effect of hardening to determine the cyclic durability of reinforced parts is shown. A graphoanalytical method for determining the cyclic durability is proposed, which allows, at the design stage and the development stage of the prototype machine, to significantly shorten the time to perform calculations of the load-bearing capacity of reinforced parts at stresses variable in time.
It has been shown that the accelerated method for determining the cyclic durability of surface hardened parts of machines allows optimizing the choice of methods and modes of hardening of the surface layer using the coefficient of technological reinforcement KV and estimating the cyclic durability of reinforced parts at this stage, significantly reducing the time costs for carrying out engineering calculations of the bearing strength of the reinforced ones.
Accelerated method for determining the cyclic durability of surface-hardened machine parts makes it possible to reasonably choose constructional material, optimize the choice of method and mode of hardening the surface layer of the part to achieve the required cyclic durability.
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