FIELD: mechanical engineering; metallurgy; agricultural production.
SUBSTANCE: invention relates to a method for increasing the reliability of cast iron anchor openers of stubble seeders using heat treatment. A method for producing anchor coulters for stubble seeders with a zonal distribution of metallographic structures, including smelting, alloying and modifying cast iron, obtaining a sand casting, removing the casting from the mould at a given temperature, moving it into a liquid bath at a given temperature, while casting from cast iron containing, wt.%: C 3.2-3.3, Si 1.8-2.0, Mn 0.9-1.0, Ni 2.8-3.0, Mo 1.6-1.7, Cr 0.9- 1.1, Cu 1.0-1.2, Mg 0.12-0.14, Co 0.1-0.15, Ti 0.04-0.06, Ba 08, S≤0.08, R≤0.950, Fe - the rest, removed from the mould at a temperature of 2-1020°C and transferred to a bath of water with a temperature of 20°C, moreover, heat treatment is carried out by five cycles of immersion and extraction of the cutting part of the working body, and in the first cycle the cutting part is immersed in water and held for 3.1 seconds, then removed and kept in air for 2.0 seconds, in the second cycle it is immersed in water and held for 4.1 seconds, then removed and held in air for 1.6 seconds, in the third cycle immersed in water and held for 9.2 seconds, then removed and held in air for 1.0 seconds, in the fourth cycle immersed in water and held for 2.0 seconds, then removed and held in air for 13.0 seconds, in the fifth cycle immersed in water and held for 1.0 seconds, then removed and held in air until completely cooled, and in the first cycle the cutting part is immersed in water by 55%, in the second cycle the cutting part is immersed in water by 80%, and in the third and subsequent cycles the cutting part is immersed in water by 100%, while the values of the minimum section of the working body are in the range of 30-33 mm.
EFFECT: zonal distribution of metallographic structures across the functional zones of the anchor coulters of stubble seeders in accordance with the type of prevailing loads due to thermal cyclic hardening.
1 cl, 2 dwg, 1 tbl
