Abstract
The results of experimental studies to determine the influence of the technological parameters of laser processing of 3Kh3M3F die steel on the service life of the working tool of a hot-stamping machine designed for hot stamping of rolling bearing rings are presented. Development of a mathematical model of the tool's resistance to laser radiation parameters was carried out by the method of mathematical planning of the experiment using a full factorial experiment. Durability of the die tool N (in thousand forgings) was chosen as an optimization criterion, while dimensionless (generalized) parameters of the speed V* and power P* of laser processing, as well as the overlap coefficient of laser tracks S* were proposed to use as factors. The obtained mathematical model of the resistance of laser-hardened die tools for hot deformation is used for the development and optimization of laser quenching modes without melting the surface of the ejectors in order to increase their thermal fatigue strength. Due to the fact that dimensionless factors containing the thermophysical characteristics of the die tool material are used in the planning of the experiment, the developed mathematical model can be used to assess the operational resistance of other heat-resistant tool steels of the martensite class.
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