Calculation and Justification Parameters of Strengthening Technology to Produce Drill Rig Shaft Gear on the Basis of Mechanics of Technological Inheritance

摘要

Gear shafts of drill rigs in case of holes drilling in coal mines work in complex aperiodical loading conditions. One way to reduce metal consumption of gear shafts is to use the combined strengthening technology on the basis of plastic deformation of the surface (PDS) method. FEM modeling of plastic deformation of the surface process and calculations of stress and strain state were done. It is shown that due to combined strengthening the yield points, stress limit and fatigue limit increase; these factors allow performing stress and fatigue crack life calculations in case of gear shafts mass is decreasing on 10-10%. It is estimated that in case of metal consumption decrease not less than in 1,5-2 times the necessary factors of safety and fatigue crack life are provided.