FIELD: machine engineering, namely articles strengthening processes, mainly at induction hardening of products such as shafts, axles with complex configuration of strengthened portions in places of opening of grooves, flats, splines and so on.
SUBSTANCE: in order to improve fatigue strength of article subjecting it (before surface hardening) to induction heating of non-uniformly heated zones (mutually joined zones of article) and then soaking article. Induction heating of non-uniformly heated zones may be realized simultaneously or continuously- successively. Induction heating of non-uniformly heated zones is realized, preferably in temperature range Aci - AC3.
EFFECT: improved fatigue strength of articles.
3 cl, 2 dwg, 1 tbl
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