Актуальные проблемы современной науки: тезисы докладов XLІІІ Международной научно-практической конференции (Харьков – Вена – Берлин – Астана, 29 августа 2019)
Section: Technical sciences
Fialko Nataliia
Doctor of Technical Sciences, Professor,
Corresponding Member of NAS of Ukraine,
Honored Worker of Science and Technology of Ukraine,
Department Head
Institute of Engineering Thermophysics of
National Academy of Sciences of Ukraine
Kyiv, Ukraine
Prokopov Viktor
Doctor of Technical Sciences, Professor, Leading Researcher
Institute of Engineering Thermophysics of
National Academy of Sciences of Ukraine
Kyiv, Ukraine
Sherenkovskiy Julii
Candidate of Technical Sciences (PhD),
Senior Scientific Researcher, Leading Researcher
Institute of Engineering Thermophysics of
National Academy of Sciences of Ukraine
Kyiv, Ukraine
Yurchuk Volodymir
Candidate of Technical Sciences (PhD),
Institute of Engineering Thermophysics of
National Academy of Sciences of Ukraine
Kyiv, Ukraine
Kutnyak Olha
Researcher
Institute of Engineering Thermophysics of
National Academy of Sciences of Ukraine
Kyiv, Ukraine
DETERMINING THE THRESHOLD PERMISSIBLE VALUES OF TECHNOLOGICAL PARAMETERS AT LASER HARDENING BASED ON THE METHOD OF POLYARGUMENT SYSTEMS
An important condition in the implementation of laser hardening technology for a cutting tool is the exclusion of a number of negative, unfavorable situations from the process. One of them takes place during the melting of the zone adjacent to the processed surface and located at some distance from the cutting edge. For this negative situation, it is necessary to determine the conditions for the beginning of melting of the zone and establish the boundary values of the corresponding technological parameters of the process.
The present work is concerned with finding the indicated threshold parameter values for the case of laser hardening of a cutting tool, which is a wedge-shaped body. In order to avoid fusion of the zone adjacent to the work surface and located at some distance from the cutting edge, the dependences of threshold values of the laser beam velocity on the distance between the cutting edge and the center of the beam are obtained.
To solve this problem, the method of polyargument systems was used as applied to the volumetric quasistationary heat transfer problem for a wedge-shaped body in the presence of a laser heating source moving at a constant speed. The main provisions of the construction of these methods are given [1-5].
The paper reveals the features of the behavior of the boundary values of the parameters in this physical situation. The monotonously decreasing character of the dependence of the dimensionless threshold velocity on the distance between the cutting edge of the tool and the center of the beam is established. The analysis performed of this negative situation with various values of the angle of sharpening of the tool.
The obtained threshold values of the parameters should be taken into account when choosing the technological modes of laser hardening of the cutting tool.
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