Finite Element Analysis of Thermal State and Deflected Mode During Titanium Alloys Machining

Stupnytskyy, Vadym; Hrytsay, Ihor; She, Xianning

doi:10.1007/978-3-030-68014-5_61

Cited by 3 publications

(10 citation statements)

References 8 publications

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“…Analysis of the use of these models allows us to conclude that the most effective method for formalizing the rheological properties of titanium alloys is the Johnson-Cook phenomenological model [2] because this model takes into account both kinematic hardening and the adiabatic thermodynamic shear of titanium alloy as a dependence of the cutting temperature and effective stress. And it is these indicators that are most significant in forming the rheological machining pattern of titanium alloys [6]. In addition, this model assumes that the strength is isotropic and dominantly depends on the average stress, in contrast to machining, for example, chromium-nickel alloys, where hardness and brittleness parameters play a significant role in the machined material fracture.…”

Section: Methodology Of Simulation Modeling Of Titanium Alloy Cutting...mentioning

confidence: 99%

Specificity of the stress-strain and thermodynamic state simulation of the titanium alloy workpiece in the cutting zone

Stupnytskyy

She

Stupnytska

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Titanium alloys have specific mechanical and physical-chemical properties that significantly reduce their machinability. Providing high productivity and accuracy has a great sense at the stage of technological preparation of machine-building production, taking into account the high cost of products from titanium alloys, as well as the need to provide increased operational properties. Simulation of machining processes of titanium alloys has many differences from the simulation of cutting of medium-carbon steels. This article focuses on recommendations for selecting an effective cutting model, describing the specific rheological properties of titanium alloys, optimizing solver selection, and cutting fracture criteria. The stages of adiabatic shear are described. The use of these recommendations contributes to the development of a more adequate model of machining titanium alloys and the choice of optimal cutting parameters to ensure a given quality of the machined surface layer of the workpiece.

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Section: Methodology Of Simulation Modeling Of Titanium Alloy Cutting...mentioning

confidence: 99%

Specificity of the stress-strain and thermodynamic state simulation of the titanium alloy workpiece in the cutting zone

Stupnytskyy

She

Stupnytska

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In this case, high-frequency oscillations of the longitudinal and transverse components of the cutting force are produced asynchronously, which causes high-frequency oscillations in the tool and workpiece (Fig. 3) [9]. This diagram shows the results of adiabatic shear zone emergence: at a certain moment of the study (simulation) (stage 1), the transverse cutting force has a maximum value.…”

Section: Literature Reviewmentioning

confidence: 97%

“…A characteristic feature in the machining of titanium alloys is the high tendency of the elastic technological system MFTW to intense oscillations. This is explained primarily by the large values of high-frequency oscillations of the radial, longitudinal and transverse components of the cutting force [5]. This is a consequence of the fact that the high plasticity of titanium alloys contributes to the emergence of a specific effect of forming the serrated shape of the chips (Fig.…”

Section: Literature Reviewmentioning

confidence: 99%

“…2. The control of dynamic cutting processes is of particular importance, because, firstly, it has a significant influence on the formation of roughness and waviness of the surface layer just for titanium alloys; secondly, the low cutting speed caused by dynamic instability leads to a decrease in machining productivity; thirdly, the formation of cyclic loads leads to the appearance of local residual stress and strain zones, which have an extremely negative effect on the fatigue strength of the product [9].…”

Section: Literature Reviewmentioning

confidence: 99%

“…In addition to the rigidity parameters and damping properties of the MFTW system elements, the particular forming pattern due to the high plasticity of the machined material layer also influences the occurrence of vibrations. This is expressed in the high-frequency change of longitudinal and transverse cutting forces and, as a consequence, the formation of a toothed (serrated) chip shape [3,4,5]. The disturbing forces, depending on the physical nature of the vibration excitation mechanism acting on the elastic MFTW system, can create both forced and self-oscillations.…”

Section: Introductionmentioning

confidence: 99%

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Special features of the dynamic cutting process analysis in the machining of titanium alloys

She

Yevtushenko

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The achievement of high accuracy parameters and the surface layer quality of the machined surface greatly depends on the dynamic stability of the system “Machine-Fixture-Tool-Workpiece”. It is especially important for machining titanium alloys because intensive tool vibrations are generated due to the adiabatic shear phenomenon. The causes and consequences of such effects are described in the article. The paper also describes a specific method for studying the dynamic state of the cutting system of titanium alloys, based on the system integration of the classical method of the analytical description of the vibration processes arising when machining and the method of rheological simulation of the cutting process. Two important problems are proposed to be solved for the effective analysis of the system modeling results: first, it is the filtering of the noise signal with preservation of the limiting values of modeling results and maximum sensitivity using the Savitsky-Golay mathematical apparatus; second, the problem of approximation and interpolation of the filtered function of cutting parameters by Fourier transform in time.

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Archive of Mechanical Engineering

Stupnytskyy,

Xianning,

Novitskyi

et al. 2022

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Titanium alloys are difficult-to-machine materials due to their complex mechanical and thermophysical properties. An essential factor in ensuring the quality of the machined surface is the analysis and recommendation of vibration processes accompanying cutting. The analytical description of these processes for machining titanium alloys is very complicated due to the complex adiabatic shear phenomena and the specific thermodynamic state of the chip-forming zone. Simulation modeling chip formation rheology in Computer-Aided Forming systems is a practical method for studying these phenomena. However, dynamic research of the cutting process using such techniques is limited because the initial state of the workpiece and tool is a priori assumed to be "rigid", and the damping properties of the fixture and machine elements are not taken into account at all. Therefore, combining the results of analytical modeling of the cutting process dynamics with the results of simulation modeling was the basis for the proposed research methodology. Such symbiosis of different techniques will consider both mechanical and thermodynamic aspects of machining (specific dynamics of cutting forces) and actual conditions of stiffness and damping properties of the "Machine-Fixture-Tool-Workpiece" system.

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Finite Element Analysis of Thermal State and Deflected Mode During Titanium Alloys Machining

Cited by 3 publications

References 8 publications

Specificity of the stress-strain and thermodynamic state simulation of the titanium alloy workpiece in the cutting zone

Specificity of the stress-strain and thermodynamic state simulation of the titanium alloy workpiece in the cutting zone

Special features of the dynamic cutting process analysis in the machining of titanium alloys

Archive of Mechanical Engineering

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