Physical model justification for retaining three-point drill bit bearing

Three-point drill bits for blasthole drilling have low wear resistance as practice shows. One of the causes is failure of retaining bearing as a result of damage of bearing track and trunnion under rather high contact and bending stresses. With the purpose of the design modification, the stress–strain analysis is implemented in CAD/CAE of АРМ WinMachine, including the total stress–strain analysis of the trunnion and the local stress–strain analyses (contacts of retaining bearing, friction bearings, etc.) The process of the stress–strain analysis involves: structure modeling, setting displacement limits, setting a material, setting of loads, computation and the results analysis. The formula of specific unit loads per drill bits is given. The calculated contact stresses in the retaining drill bit bearing are presented. With a view to proving the relevance of the simulation model, the physical model of the retaining bearing is constructed and manufactured subject to adhered similarity to a full-scale sample by the criterion of stress equality. The procedure is proposed to be used in the drill bit tool designing.

Simisinov D. I., Afanasiev A. I., Zakharov I. A. Physical model justification for retaining three-point drill bit bearing. MIAB. Mining Inf. Anal. Bull. 2021;(11-1):190—196. [In Russ]. DOI: 10.25018/0236_1493_2021_111_0_190.

The study was carried out in accordance with the state assignment of the Ministry of Education and Science of Russia to perform research for the Ural State Mining University on the topic No. 1021060707960-7-2.3.1.

Simisinov D. I.¹, Cand. Sci. (Eng.), Associate Professor at the Mining Equipment Operation Department, 7sinov@mail.ru
Afanasiev A. I.¹, Dr. Sci. (Eng.), Professor at the Engineering Mechanics Department, gmf. tm@m.ursmu.ru;
Zakharov I. A.¹, Master’s Student;
¹ Ural State Mining University, Yekaterinburg, Russia.

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