The Increase of the Strength of the Tooth - Rolling Cutter Joint

There have been investigated the strength of the tooth-rolling cutter joining which greatly affects the durability of the drilling bit. The increase of interference during the compression results to the increase of the stress concentration in the tight coupling tooth rolling cutter body. It has been shown that for the assembly with the maximal interference the contact pressure exceed the permissible, which is unacceptable. To avoid this the selective assembly of the tooth-rolling cutter body press-joint is proposed. The usage of the selective assembly allows to have more homogeneous joints. The reduction of difference between maximal and minimal values increases the homogeneity, and therefore, the quality of the joint.