| Summary: | Background. Knives made of difficult-to-cut steels are used in a wide range of
general and special engineering products. They are subject to high demands on the geometric
accuracy of surfaces and the characteristics of the physical and mechanical properties of
the surface layer. This makes it difficult to assign the parameters of their thermomechanical
processing. The purpose of the work is to develop mathematical models and study the process
of formation of residual stresses when grinding knives from difficult-to-cut steels. Materials
and methods. Theoretical experimental methods are used to study the stress state of
plates made of difficult-to-cut steels, including analytical methods for solving problems of
thermoelasticity. Results. Mathematical models of the process of formation of residual
stresses in workpieces from difficult-to-cut steels that have undergone grinding have been
developed. The main schemes for the formation of residual stresses, implemented at different
grinding temperature ranges, are considered. The main calculated dependences for the
experimental determination of residual stresses are presented. Conclusions When grinding
knives made of difficult-to-cut steels, under the action of high temperatures, residual stresses
arise in the surface layers of the workpiece, leading to warping. The models presented in
the work make it possible to estimate both the magnitude of residual stresses and the magnitude
of warping, which, ultimately, allows us to assign rational parameters for thermomechanical
processing of knives.
|
|---|