Parameters of Dimension Chains of Roller Cone Drill Bits
D. I. Simisinov1, L. V. Gorodilov2, A. D. Simisinov1
1Ural State Mining University, Yekaterinburg, Russia
2Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Roller cutter drilling tool, roller cone drill bit, dimension chain, manufacture error, error calculation procedure
Abstract
The authors have revealed and compared the internal and external parameters that form a multi-element loop system (dimension chain) of a roller cone drill bit. The article presents procedures for the probability calculation of a dimension chain of the tool dimeter, calculation of the tool diameter error because of the rotation of the cone drill bit on the bit leg, and for the calculation of eccentricity error of gage cones relative to the axis of the fitting thread for three- and four-cone drill bits. It is recommended to revise the values of dimensional tolerance for roller cone drill bits and to amend related normative and technical documentation.
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