Assessing the Impact Strength of Blade Edges of Forestry Machinery Operating Components

This paper discusses how to assess the impact strength of the blade edges of forestry machinery operating components. The impact of the material under processing is the main factor contributing to the destruction of cutting edges. In soil-cutting, multiple percussive impacts on the blade edge result in the accumulation of volumetric damage, which makes the soil-cutting components blunt and less efficient. We have used an impact tester to carry out impact strength tests of blade edges by means of which we obtained data on how the hole depth would alter depending on the number of strokes in a semilog coordinate system; the depth alteration conformed to the linear law, and the depth would no longer alter past 500 strokes. The blade edge was destroyed mainly due to the plastic displacement of metal toward the base layer. The accuracy of this method for determining the strength parameters of blade edges was assessed by means of a set of statistical data on the depth of 30 holes on steel blades with a miter angle of 40° that had been heat-strengthened to 5558-HRCЭ.