METHOD OF PROCESSING FRICTION SURFACES OF PARTS FROM ARTIFICIALLY GROWN MONOCRYSTAL BASED ON ALPHA-AlO Russian patent published in 2016 - IPC B24B1/04 B28D5/00 

FIELD: technological processes.

SUBSTANCE: invention relates to abrasive processing of friction surfaces of sapphire parts of plunger pairs which are component parts, in particular, of pump and/or dosing devices, and can be used in pharmaceutical, food, chemical, perfume, cosmetic, machine building and other industries. Method involves use of pieces of workpieces made from an artificially grown crystal based on α-Al₂O₃ and mechanical treatment of surface of produced workpieces with a diamond tool in presence of cooling liquids with successive decrease in grain value of abrasive tool. Mechanical treatment includes consecutive steps, specifically: grinding surface of workpieces, medium grinding of surface to values of surface roughness R_z=10-20 mcm and at least one subsequent finishing treatment of surface of workpieces with ultrasonic vibrations with frequency of 21-23 kHz to surface roughness R_a=0.020-0.025 mcm.

EFFECT: reduced friction coefficient of friction surfaces of parts, labour intensity and time of fabrication with increased hardness and microhardness of their surface layer.

8 cl, 3 ex