Modeling of “combined cutter - cone” connection in tricone drill bits

A theoretical analysis of the stiffness of the “cutter-cone” connection was performed. In the article the character and magnitude of the tension at the contact of "cutter-cone" are investigated. An analysis of the surface of the openings for carbide inserts revealed traces of plastic deformation and fretting wear.

Optimization of the structures by the static strength and the frequency characteristics

Problems of determination of optimal geometric and constructive parameters of long-length structures are presented. For example, a longitudinal profile of a complicated section is adopted, its components of the stress state and its own oscillation frequencies are determined. The choice of optimal profile parameters is made for the implementation of structures with minimum equivalent stresses, as well as for ensuring maximum dynamic stiffness.


For defense the constructions elements from corrosion on the Black Sea shelf are often used organic and inorganic coatings, and as well corrosion-resistant alloys, which makes it possible to use equipment in more aggressive environments, expanding the conditions for their applying. However, the protective properties of anti-corrosion coatings in media in the presence of hydrogen sulfide and the simultaneous action of mechanical stress is not sufficiently studied.

Математичне моделювання впливу зовнішнього середовища на напружено-деформівний стан деревини у процесі сушіння

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.

Improved calculation and strength of thermowells during operation

Accurate evaluation of possible safe operation of thermowells essentially depends on the accuracy of the maximum stresses in them during operation. These stresses are generally determined from simple engineering formulas for bulk of canonical shape, mostly cylindrical shells or beams for the relevant boundary conditions. Thus the general solution is obtained step by step. First the tangential stresses are obtained from relations for cylinder subjected to external pressure.

Evaluation of the permissible moment in a roller cone drill bit providing the prescribed reliability of work

After analyzing the nature of the damage of surfaces was discovered the traces of the compression effect which arise along the cutters axis when squeezing it into the rock of delve. There were also founded the traces of deformation from the action of bending to the cutter, depending on the orientation of its slip on the face. We noticed the rubbing, fretting-corrosion, damage the local areas of the apertures walls caused by scrolling the cutter around its axis in the aperture of cones crown.

Improving the Quality of the Technology of the Process When Preserving Tungsten Carbide Inset Cutter in the Cone

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.

Improvement Technology Manufacturing Drill Bits With False Rock Cutting Rigging During the Design Process of Pressing Carbide Inserts in Milling

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.

Designing New Product Line of Cutters for Development of Functional-oriented Technology of Their Manufacturing

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.