Investigation of the Process of Deep Drilling of Stainless Steel

Purpose of research. Experimental assessment of the effect of deep drilling modes for high-alloy steel on the components of cutting forces. Making holes in a solid material with a hole depth equal to or greater than ten hole diameters refers to deep drilling operations. For drilling, special tools are used – drills for deep drilling - ejector, cannon, gun drills. Universal or special equipment is applied, the tooling includes travelling or fixed rests, guide bushes. To achieve this goal, it is necessary to choose equipment: type of tool for deep drilling, type of setting; create a model of the forces acting on the cutting part of the tool during deep drilling; evaluate the degree of influence of processing modes on cutting forces.

Methods. The research is based on the cutting theory provisions, mechanical engineering technology, experiment planning and regression analysis.

Results. Based on the provisions of mechanical engineering technology, the setting up for deep drilling with a rotating workpiece and a non-rotating drill, which is imparted only by the axial feed, was developed. A cutting tool for performing a deep drilling operation is defined – a gun drill. A pattern was created for such a processing scheme and experimental cutting forces were calculated. According to the results of the calculations, it is determined that the greatest influence on the components of the cutting force in a given range of cutting modes is exerted by the axial feed rate of the tool.

Conclusion. The cutting forces that occur during deep drilling reach significant values. The polynomial equations obtained as a result of the study allow us to assess the degree of influence of processing modes on cutting forces, calculate cutting forces for further calculation for the sag of the stem of a gun drill.

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