A. E. Tsibulko, E. A. Romanenko (PJSC «NKZM», Kramatorsk, Ukraine)

Strength conditions in bending and torsion according to the known theories of the limiting state

The presented conditions for the calculation of structural elements for bending and torsion according to the known theories of the limiting state are presented.

Keywords: bending; torsion; shear; theory of strength; main, equivalent, normal, tangent stresses.

Y. K. Filippov, S. А. Egorov, M. I. Mishin (Moscow Polytechnic University, Moscow); A. S. Aralov (AVK «Domodedovo», Domodedovo)

Relationship between hardness and stress intensity during cold forging

The study is the establishment of a relationship between the hardness of the deformed metal and the intensity of stresses during plastic deformation. Dependence is determined between the hardness and the magnitude of the deformation and stress state for steel 10 GOST 10702–86.
Keywords: deformation; stress; micro hardness; calibration graphs of hardness versus strain and stress.

T. S. Ivleva, D. R. Salikhyanov, S. V. Myl’nikov, S. K. Grekhov

Analysis and reduction of wall thickness variation during closed-die forging of small-radius elbows from corrosion-resistant steel 08KH18N10T

This research work is devoted to the study and solution of the problem of reducing the wall thickness variations of small-radius elbows. Wall thickness variation of elbows is the result of inhomogeneous stress-strain state over the cross section of the workpiece during its hot closed-die forging. In order to solve the problem of reducing the wall thickness variation of the elbows, finite element modeling package Q-Form was used. With the use of Q-Form package, possible technical solutions of the problem were tested and compared with each other by the example of closed-die forging of small-radius elbow Ø76 mm from 08Kh18N10T stainless steel. The simulation results were compared with the results of closed-die forging under production environment.
Keywords: small-radius elbows; bending; hot closed-die forging; corrosion-resistant steel.

A. G. Korchunov, E. S. Reshetnikova, E. A. Svistunova, I. A. Savelieva (Magnitogorsk State Technical University, Magnitogorsk)

Methods for predicting the resource of profiling rolls for the production of high-strength reinforcement, which based on computer modeling

An algorithm for predicting the life of the profiling roll for applying a periodic profile to calibrated steel has been developed. With the help of the DEFORM software and computer complex, bases were formed and calculations of the process of applying a three-way periodic profile by the finite element method were performed. The stress state at the contact areas of the tool and the workpiece is determined. The state of the tool is analyzed to determine the influence of stresses in the contact interaction of the workpiece and the streams of the profiling roll. Calculations of the average life of the profiling roll are performed on the basis of the theory of forecasting the reliability of technical objects by the criteria of kinetic strength.

Keywords: high-strength reinforcement; profiling roll (roller); computer modeling; tool stress state; tool reliability prediction method; average life.

I. A. Burlakov (Production complex «Salut» JSC «ODK», Moscow), P. A. Petrov, Bach Vu Chong (Moscow Polytechnic University, Moscow)

Construction of the yield curve of fine-grained technical titanium VT1-0

This article describes the sequence of processing of experimental data obtained during mechanical testing of VT1-0 titanium using the QForm VX computer program, starting with primary processing of the experimental results and ending with the determination of unknown coefficients of the selected model of deformation resistance.
Keywords: technical titanium VT1-0; inversion analysis; computer modelling; loading diagram; yield curves; mechanical tests; strain resistance model.

A. V. Koshelev, (PJSC Arzamas Scientific-Production Enterprise «Temp-Avia», Arzamas); N. P. Yampurin, A. V. Platonov, M. V. Koshechkina, M. A. Kumaneev, K. A. Shchegletov (Arzamas Polytechnic Institute, a branch of the Nizhny Novgorod State Technical University named after R. E. Alekseev, Arzamas)

Methodology for modeling the frequency oscillations of bearing assemblies using the Solid Works Simulation software package

The development of a methodology for modeling the strength parameters of bearing assemblies used in rotary and rotating devices is an urgent task, which is solved in the article. The concept of the recommended technique is based on replacing the real rolling bearing model with a virtual simulator. To conduct research under the influence of vibration and shock on the test object, the connector-spring tool of the Solid Works Simulation software package is used. Using the developed technique allows to reduce the preparation time for the production of products that use the considered combination of elements.
Keywords: dynamics of the bearing assembly; resonance of the bearing support; rolling bearing; modeling of frequency oscillations; imitation of joints; radial stiffness of the joint.

I. Z. Sungatov (Almetyevsk branch of Kazan National Research Technical University named after A.N.Tupolev, Almetyevsk)

Development of a design and technological model of a spherical mill with helical chip grooves for CAD systems

The profile features of a mechanical CAD system usually have complex shapes due to the guide curve, which is of the free-form type. However, this type of free-form guide curve makes it difficult to represent the corresponding shape of the object in other CAD systems during considering the interaction between dissimilar CAD systems.
Keywords: special disk tool; helical groove profile; cad; cam; mathcad.