FIELD: mechanical engineering; metallurgy; agricultural production.
SUBSTANCE: invention relates to a method for improving the wear resistance of cast-iron working bodies of soil-cultivating implements using heat treatment. The method includes smelting, alloying and modifying cast iron, obtaining a casting in a sand, metal or ceramic mould, removing the casting from the mould at a given temperature, moving it into a liquid bath with a given temperature, characterized in that the casting is made from cast iron having the following chemical composition, %: C 3.1-3.2, Si 2.3-2.5, Mn 0.4-0.5, Ni 2.3-2.4, Mo 1.3-1.4, Mg 0.05- 0.06, S≤0.08, P≤0.08, Fe - the rest, removed from the mould at a temperature of 950-1020°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, while on the first cycle the cutting part is immersed in water and held for 3 s, then removed and kept in air for 2 s, on the second cycle it is immersed in water and held for 2 s, then removed and held in air for 3 s, in the third cycle immersed in water and held for 2 s, then removed and held in air for 4.5 s, in the fourth cycle immersed in water and held for 2 s, then removed and held in air for 10 s, on the fifth cycle they are immersed in water and kept for 1 s, then they are removed and kept in air until completely cooled, and on the first cycle the cutting part is immersed in water by 50%, and on the second and subsequent cycles the cutting part is immersed into the water by 100%, while the values of the minimum section of the working body are in the range of 20-25 mm.
EFFECT: increase in the wear resistance of the working bodies of tillage tools due to the zonal distribution of metallographic structures in functional zones in accordance with the type of prevailing loads.
1 cl, 1 ex, 1 tbl, 1 dwg
