METHOD OF INCREASING WEAR RESISTANCE OF CUTTING PLATES FROM OXIDE-CARBIDE CERAMICS DURING MILLING Russian patent published in 2020 - IPC B23C3/00 

FIELD: machine building.

SUBSTANCE: invention relates to machine building, particularly, to metal cutting, and can be used in making cutting tools from oxide-carbide ceramics. Method includes, after grinding operation, a pulse laser modification of contact sections of ceramic plates with formation of strengthening chamfer with length of 0.3–0.35 mm, angle of 20…22° and edges rounding to radius of 0.09 mm at radiation intensity of 36.7 J/cm², pulse repetition frequency 70 kHz, pitch between pulses 20–30 mcm and number of passes 300. After pulse laser modification on surface of ceramic plates by method of plasma-chemical gas-phase deposition diamond-like coating with thickness of 2.5–3 mcm is applied in plasma of glow discharge by starting chemical reaction and discharge destruction of gas mixture of acetylene C₂H₂ with volume fraction of 90 %, argon Ar with volume fraction of 8 % and tetramethylsilane Si(CH₃)₄ with volume fraction of 2 %.

EFFECT: improving properties of surface layer of oxide-carbide ceramics, providing high wear resistance and minimizing cases of brittle fracture of cutting part of ceramic plates during milling of hardened steels and heat-resistant alloys at increased feeds.

1 cl, 6 dwg, 1 tbl