FIELD: mechanical engineering; metallurgy; agricultural production.
SUBSTANCE: invention relates in particular to a method for increasing the reliability of cast iron anchor openers of stubble seeders using heat treatment. The method includes smelting, alloying and modifying cast iron, producing 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 2.4-2.6, Mn 0.7-0.8, Ni 2.7-2.8, Mo 1.6-1.7, Cr 0.7- 0.8, Cu 0.6-0.7, Mg 0.09-0.1, 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 at a temperature of 20°C, and heat treatment is carried out by four cycles of immersion and removal of the cutting part of the anchor opener, while in the first cycle the cutting part is immersed in water and held for 1.8 seconds, then removed and kept in air for 2.9 seconds, in the second cycle it is immersed in water and kept for 1.7 seconds, then removed and kept in air for 3.9 seconds, in the third cycle immersed in water and kept for 1.7 seconds, then removed and kept in air for 8.8 seconds, in the fourth cycle immersed in water and held for 1.0 seconds, then removed and kept in air until completely cooled, and in the first cycle the cutting part is immersed in water with a plane from the upper frontal corner of the first thickening from above to the perpendicular to the middle of the distance from the bottom of the second thickening from above to the lower occipital angle relative to the established state, and in the second and subsequent cycles, the cutting part is immersed in water with a plane from the upper frontal angle of the first thickening from above to the lower occipital angle relative to the established state.
EFFECT: increased reliability of anchor coulters of stubble seeders due to the zonal distribution of metallographic structures across functional zones.
1 cl, 2 ex, 1 tbl, 2 dwg
