- TITLE:
SEARCH OF METHODS OF CLAMPING OF THIN WALLED CYLINDRYCAL DETAILS WITH THE USE OF GENETIC-MORPHOLOGICAL APPROACH
- AUTHOR(S):
Ibrahim Farhan Salman Alrefo, Yurii Kuznetsov
- ABSTRACT:
The article introduces a generalized classification of thin-walled cylindrical details and a new
approach of genetic morphological synthesis of methods of their clamping based on the latest
advances in various areas of science and technology. The article shows that structural solutions of
thin-walled cylindrical details used in machine tools, machines, apparatuses and other technological
equipment can be classified not only by the ratio of length to outer diameter and end face and by the
presence of an end face, but by the availability of outer and inner projections as well. Such a
diversity of shapes of various thin-walled cylindrical details influences the choice of the method of
clamping them within processing quality assurance.
The article gives examples of various methods of axial, radial, tangential clamps, where they are
described as genetic codes and structural formulae using them as elementary material medium of
hereditary information in mental experiments of a material point. It is noted that the suggested
generic-morphological approach with universal genetic synthesis operators can be one of
prerequisites of employing the artificial intelligence for anticipation and synthesis of clamping
mechanisms and machine tooling in various fields of mechanical assembly manufacturing.
- PAGES:
4-
- TITLE:
INTELLIGENT TRANSPORT SUBSYSTEM FOR ESTIMATING THE TRAFFIC DENSITY AND ITS COMPOSITION BASED ON ARTIFICIAL NEURAL NETWORKS AND PARALLEL COMPUTING
- AUTHOR(S):
I. Yeuseyenka, I. Melnikau
- ABSTRACT:
The article describes the intelligent transport systems trends and identifies their perspective
directions. Special attention is paid to the function principle of the intelligent traffic density
estimation and vehicle classification subsystem. A new approach for improving the speed of this
subsystem by the instrumentality of the GPUs (Graphics Processing Unit) and parallel computing is
suggested. Different transport detectors were analyzed to select the most useful one for further use in
the subsystem. The intelligent subsystem has been developed to estimate the traffic density and its
composition in order to integrate it with conventional video surveillance systems used for violations
video recording.
- PAGES:
3-
- TITLE:
METHODS OF INTENSIFICATION OF TRANSMISSION PHENOMENA IN THE CHEMICAL TECHNOLOGICAL PROCESS OF PRODUCING HYDROGEN AND OXYGEN
- AUTHOR(S):
I. Nochnichenko, O. Jakhno
- ABSTRACT:
The article discusses the technological process of electrolysis from the point of view of the
transfer phenomenon and the position of physical chemistry. It is shown that taking into account the
transport phenomena and associated processes depends on the state of the medium and is determined
by the functions of the transport coefficients: (momentum, mass, heat). Physicochemical processes in
a mechatronic electrolyze have been experimentally investigated, mechanisms of intensification have
been proposed, and the regularities of transfer processes have been studied. The influence of
ultrasonic cavitation, vibration on the electrolysis process, the was investigated, and the
dependences of the potential of the electrolyzer required for the splitting of water on the temperature
with intensification modules were obtained.
- PAGES:
2-
- TITLE:
NEW LOOK TO CREATION OF VISES FOR OBJECTS OF DIFFICULT FORM WITH THE USE OF MORPHOLOGICAL APPROACH AND THEORY OF FRACTALS
- AUTHOR(S):
Y. Kuznietsov, G. Xingmin
- ABSTRACT:
The paper proposes morphological formulas of universal vise from morphological set containing
alternatives of new features of state, type of performance and mobility of clamping elements as well
as prerequisites for using of the fractal theory to model the clamping process of complex shapes
- TITLE:
EFFECT OF HEAT-TREATMENT TEMPERATURE ON THE MECHANICAL AND MICROSTRUCTURAL PROPERTIES OF AISI 4140 STEEL
- AUTHOR(S):
G. İrsel, B. Nur Guzey, B. Kara
- ABSTRACT:
Heat treatment is a metallurgical process for removing residual stresses in metals, improving
their mechanical properties, reducing surface hardness, and preventing the formation of brittle
fractures or cracks. The tempering (age hardening) process, which is a type of heat treatment in
tempered steels, affects the mechanical and microstructural properties of the steel more than the
other steel types. In this study, the base material test specimens with 13 HRC hardness and 12.5 mm
diameter were heat-treated and tempered, and the effect of the heat treatment process on the
mechanical and microstructural properties was investigated. AISI 4140 tempered steel was tempered
at 600°C for 3 hours after 3 hours of heat treatment at 880°C, 850°C and 820°C and cooled in oil.
While the base material has a tensile strength of 654.16 ± 12 MPa, the maximum tensile strengths
were determined as 1022.44 ± 10 MPa, 1006.24 ± 9 MPa and 987.454 ± 11 MPa, respectively, after
heat treatment at 880°C, 850°C and 820°C. The strength of the material increased by 56.29% by
applying heat treatment at 880°C temperature. This increase in strength is associated with the
transformation of the existing microstructure from ferritic to martensitic structure. The needle-like
structure in the martensitic structure increased and lath martensite structure was formed with the
combination of grain boundaries with increasing heat treatment temperature. Strength and hardness
increased while the heat treatment temperature is increasing. It was observed that ductility
decreased. Hereby, the temperature parameter in the heat treatment process is effective on the
strength and the heat treatment has high advantages in terms of material saving in machine designs.
- DOI:
https://doi.org/10.62853/BSUC2659
- PAGES:
51-56
- HOW TO CITE THIS ARTICLE:
İrsel G., Nur Guzey B., Kara B. Effect of heat-treatment temperature on the mechanical and microstructural properties of AISI 4140 steel. Journal of the Technical University of Gabrovo 65 (2022) 51-56
