METHOD FOR HARDENING OF INTERNAL SURFACES OF PART CHANNELS Russian patent published in 2023 - IPC B23H5/06 B23H9/00 

FIELD: material processing.

SUBSTANCE: invention relates to the field of finishing and hardening treatment and can be used for finishing and hardening with conductive granules of the internal surfaces of channels, for example, narrow blade channels of variable cross-section in turbine wheels with an external beltline, having unstable initial microgeometry and physico-mechanical properties of the surface layer of the material unevenly distributed along the channel profile. The method includes pulse-shock vibration extrusion of the channels of the part with conductive granules in the container body when the container vibrates and a positive voltage is applied to the part and a negative voltage is applied to the conductive granules. Hardening is carried out at a constant mode at a vibration frequency of the container of 30 Hz for periods of no more than 5 minutes with an interval of no more than 50 seconds, during which low-conducting industrial water is constantly and cyclically fed into the container, and the vibration frequency of the container is decreased to 20 Hz.

EFFECT: uniform degree of cold work and elimination of microdefects is ensured throughout the treated surface.

1 cl, 1 dwg, 1 ex