tension

During and after the technological operation of pressing these factors significantly determine the residual stress states of tungsten carbide inserts, as well as in the areas near the holes of the cones’ crowns of the cone. The stressed state of the inserts and the magnitude of the stress concentration determine their fatigue strength of them and the durability of the inserted carbide rock-blasting equipment of the cones in the area where the inserts the cone.

In this article patterns of development of tension-deformed state of canillary–porous materials with variable heat-mechanic characteristics in the process of drying, depending on the characteristics of the environment, were resulted. The influence of the parameters of drying agent on the dynamics of stress in the wood was investigated on the basis of numerical experiment.

Determined that modern technology to ensure normal distribution sizes of holes in the roller cone bit for installation cutter pick under the false standard size of 14 mm create favorable conditions for selective grouping groups the size of holes and plug tungsten carbide inset cutter. In article proposed a method to establish rational parameters tensions in the design of connections “cone — tungsten carbide inset cutter” nine selective groups. This approach enables to provide constant average value of tension at 0.103 mm.

This work is devoted to questions of technological cyclic durability maintenance, of the material for parts working under cyclic loading conditions, by lathe processing optimization. The analysis of the impact of the surface layer quality on fatigue characteristics is described for parts operating under cyclic loads. Survey of methods for evaluating cyclic durability is completed, which showed lack of information about the mathematical relation between the cyclic durability of the part’s material and technological conditions of its production.

Favorable conditions are created under false carbide teeth for grouping selective groups of dimensions of holes and teeth if the conditions existing technology to ensure normal distribution of sizes of holes in the crown cutters. The proposed method allows to determine the optimal parameters tensions in the design of connection “tooth-rolling cutter” in selective groups.

The aim of research is the improvement in quality indicators embedded rock cutting equipment of cutter drill bits. Research carried out as in a real production drilling bits and during modeling in CAD-system, integrated use of experimental laboratory, bench and field operational tests.