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RISS 인기검색어
- 검색키워드
- 저자 : Michael Storchak (검색결과 2 건)
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Refinement of temperature determination in cutting zones
Michael Storchak,Valerii Kushner,Hans-Christian Möhring,Thomas Stehle 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.8
A methodology for temperatures calculating in different cutting zones is proposed, taking the peculiarities of heat distribution for moving sources into account. For this, the correlation was established between the heat flow densities and temperatures in the chip forming area, in the stagnation zone as well as in the zone of plastic contact between the chip and the tool. The method for temperature calculation was based on the joint solution of the heat conduction equation and the constitutive equation of the machined material. A significant simplification of the temperature calculation was achieved without sacrificing accuracy by considering the features of the heat propagation from fast-moving sources. Taking into account material softening, the temperature and heat flow density distributions along the tool rake and clearance faces and in the stagnation zone were numerically calculated. The developed models were confirmed by experiment. The comparison showed good agreement between theoretical and experimental results.
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Mechanical properties of subsurface layers in the machining of the titanium alloy Ti10V2Fe3Al
Michael Storchak,Islam Zakiev,Luca Träris 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.1
We experimentally analyzed the forming of micromechanical properties in subsurface layers of machined workpieces depending on cutting parameters such as cutting speed, feed, axial depth of cut and radial depth of cut of milling cutters. Springback development was examined in orthogonal cutting. The micromechanical properties in subsurface layers were measured with nanoscratch tests depending on the cutting parameters. When measuring the value of springback in the orthogonal cutting of the titanium alloy Ti-1023 with varying cutting parameters and geometries of the tool wedge, it was detected that the elastoplastic springback value increased with rising cutting speed and axial depth of cut. Springback decreased with increasing tool orthogonal rake angle. Raising the feed and the radial depth of cut of the milling cutter led to a proportional increase in the tangential force component of the resistance to movements of the indenter in the material’s subsurface layers in nanoscratch tests. Moreover, increasing the feed of the milling cutter led to a proportional increase in the amplitudes of the five lower frequencies of the tangential force’s signal. This characterizes a growing scattering of the strength properties of larger fragments in subsurface layers of the milled material.
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