SPATIAL STRESS-STRAIN STATE OF BORING BAR FRONT-END STRUCTURE OF HEAVY-DUTY HORIZONTAL BORING LATHE

SHERBAKOV Sergei S., D. Sc. in Phys. and Math., Assoc. Prof., Professor of the Department of Theoretical and Applied Mechanics, Belarusian State University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

SHI Wu, Assoc. Prof., Associate Professor of the School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin, China, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

JUNPENG Shao, Prof., Dean of the School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin, China, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

NASAN Aleh A., Junior Researcher, Belarusian State University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

Mechanical and mathematical models describing the spatial stress-strain state and frictional contacts between elastic elements of the boring bar front-end structure of heavy-duty horizontal boring lathe were developed. All the calculations were performed using the finite element simulation package ANSYS Workbench Mechanical. Static formulation of the problem with the account of gravitational force and non-linear behavior of the materials in the vicinity of the cutting surface of the cutter was considered. Four different statements of the problem were analyzed. They illustrate the effect of the bolted connections pretension clamping the cutter on the stress-strain state of the system. The effect of front-end structure’s loading on the boring bar during cutting was investigated. The effect of the boring bar bending on front-end structure was analyzed. The carried out analysis showed that the components of the stress-strain state of the studied systems have similar distributions, regardless to the bending of the boring bar due to the force of gravity. Bending of the boring bar has significant influence only on the displacements. Stress concentrators were present in many regions of the studied system. This complicated the analysis of complex distributions of stresses and strains fields. Obtained results demonstrate the need of movement from the local characteristics of damageability (stress tensor components) to the integral ones – dangerous volumes.

tribo-fatigue, multi-element system, stress-strain state, finite element modeling, heavy-duty boring lathe, boring bar, front-end structure

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