Performance Evaluation of Tools Made of Super Hard Material CBN during the Renovation of Components of Harvester Machinery

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An investigation was conducted to examine the influence of hard alloy turning tools and BN-based super hard materials on the performance characteristics during the finish turning of components with the deposition of Surfacing wire (Sw)- 40Cr8Si2 (HRC 50-58). Upon deposition, the surface undergoes a significant increase in hardness, resulting in a hard-faced item with a rough, uneven, and undulating surface. Consequently, a machining process is employed to provide a smooth finish and ensure the desired dimensions are maintained. The variables in question are as follows: transverse chip shrinkage ξ, frictional coefficient during modeling µ, vertical component of cutting force Pz (in Newtons), cutting temperature θ°С, machined area F (in square meters), cutting-tool life before reaching a specified blunting criterion Т (in minutes), maximum cutting length at the optimal wear of cutters L = T-V (in kilometers), and the relative flank wear of cutters at their specified resistance. The symbol "hoз" represents the ratio of hз to L, where hз is measured in micrometers (µm), and L is measured in kilometers (km). It is used to describe the roughness of a machined surface. The performance characteristics of turning cutters in this investigation were measured in terms of Ra (µm). The techniques of experimental optimization of surface roughness that have a significant influence on resurfaced hard turning are also investigated.