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Journal PROCEEDINGS IN MANUFACTURING SYSTEMS |
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ISSN 2343–7472 ISSN-L 2067-9238 |
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Journal PROCEEDINGS IN MANUFACTURING SYSTEMS □
Volume 21, Issue 2, 2026 Possibilities
for turning hyperboloidal surfaces · Mariana Cristiana IACOB, Diana POPESCU, · Ana Maria NICA, Irina COZMÎNCĂ, · Valentin CORZANU, Alina DUTA, Cristina TEISANU, Analysis of deformation and
springback behavior of a freeform surface in the automotive field · Daniela-Mariana ILIE, Constantin-Adrian
POPESCU, Emilia-Maria POPESCU, Costel Emil COTET, Design and development of an
autonomous mobile platform for optimizing logistics processes Alexandra-Anamaria SPIRIDON1,*l, Vlada ȚISARI2l, Roxana HOBJÂLĂ3l, Adriana MUNTEANU4l, Mariana CIORAP5l, Bruno RĂDULESCU6l, Laurențiu SLĂTINEANU7l 1) Master Student, Department of Digital Production Systems, “Gheorghe
Asachi” Technical University of Iasi, Romania 2) Master Student, Department of Machine Manufacturing Technology,
“Gheorghe Asachi” Technical University of Iasi, Romania 3) PhD Student, Department of Machine Manufacturing Technology,
“Gheorghe Asachi” Technical University of Iasi,
Romania 4) Prof., Department of Digital Production Systems, “Gheorghe Asachi”
Technical University of Iasi, Romania 5, 6) Lecturer, Department of Digital Production Systems, “Gheorghe Asachi”
Technical University of Iasi, Romania 7) Prof., Department of Machine Manufacturing Technology, “Gheorghe
Asachi” Technical University of Iasi, Romania https://doi.org/10.5281/zenodo.21861535 Abstract: In the
paper, the problem of obtaining a single-sheet hyperboloidal surface by
turning was addressed. Hyperboloidal surfaces are encountered, for example,
in industrial practice, in the case of rollers used for straightening
cylindrical bar-shaped workpieces, and workpieces from which the gear wheels
that are components of a hyperboloidal gear are to be obtained. At present,
it is possible to manufacture hyperboloidal surfaces on numerically
controlled machine tools, in which the cutting tools move along hyperbolas,
by using numerically programmed trajectories. The fact that single-sheet
hyperboloidal surfaces belong to the category of ruled surfaces also led to
the idea of using machining processes in which the tools move along
rectilinear trajectories, while the workpieces perform rotational movements.
In this way, processes for obtaining single-sheet hyperboloidal surfaces have
been developed by using wire electrical discharge machining or milling. In
the paper, the idea of obtaining hyperboloidal surfaces by turning, through
the use of a specialized device, is developed. The conditions under which
such a device can operate and the limits of its use have been highlighted. Keywords: single-sheet hyperboloidal surfaces,
turning machining, device adaptable to a universal lathe, functional angles,
limits of use.
Mariana Cristiana IACOB1,l, Diana POPESCU2, *l 1) Eng, PhD), Robotics and Production Systems, National University of
Science and Technology POLITEHNICA Bucharest, Romania 2) Prof., PhD, Robotics and Production Systems, National University of
Science and Technology POLITEHNICA Bucharest, Romania https://doi.org/10.5281/zenodo.21861921 Abstract: This paper investigated the
processing behavior of Filaflex Foamy, an expandable thermoplastic
polyurethane (TPU) filament with a thermally activated foaming agent, processed
by Material Extrusion (MEX) process. The study analyzed the influence of
extrusion temperature, flow rate factor and nozzle diameter on the
dimensional accuracy, apparent density and Shore A hardness of 3D-printed
cuboid samples. Filaflex Foamy was investigated in two experimental stages.
In the first stage, samples were printed with a 0.4 mm nozzle at extrusion
temperatures of 230 °C, 240 °C and 250 °C and flow rate factors of 0.8, 0.9
and 1.0. In the second stage, the influence of nozzle diameter was analyzed
at 240 °C using 0.4 mm, 0.6 mm and 0.8 mm nozzles. The results showed that
Shore A hardness was strongly associated with the apparent density and flow
rate factor, while the extrusion temperature had a secondary effect within
the investigated range. The dimensional deviation along the build direction
showed a dependence on both extrusion temperature and flow rate factor. At
low flow rate factors, the samples’ height remained below the nominal value,
and at a flow rate factor of 1.0, positive values were obtained, especially
at higher extrusion temperature. The nozzle diameter also influenced the
dimensional response, but the effect showed no clear trend. varioShore TPU
data were used as a reference. The comparison showed that the two expandable
TPU materials presented different density-hardness responses, with varioShore
TPU reaching higher Shore A hardness values at lower apparent density levels.
The results also indicated that expandable TPU filaments require
material-specific calibration as the processing window cannot be directly
transferred from one filament system to another. Key words: foaming agent filaments,
Filaflex Foamy, varioShore, apparent density, Shore A, extrusion temperature,
flow rate, nozzle diameter. Cutting
tool processing methods to improve dry and near-dry metalworking – a review
on machining performance Ana Maria NICA1,*,
Irina COZMÎNCĂ2l 1) Lecturer, PhD, Digital Production Systems Department, Faculty of
Machines Manufacturing and Industrial Management, „Gheorghe Asachi” Technical
University of Iasi, Romania 2)Assoc. Prof., PhD, Digital Production Systems Department, Faculty of
Machines Manufacturing and Industrial Management, „Gheorghe Asachi” Technical
University of Iasi, Romania https://doi.org/10.5281/zenodo.21873522 Abstract: Metal cutting is still one of the most commonly used machining method,
but it comes with some drawbacks such as the negative impact on the
environment by producing hazardous emissions into air, water and soil. The
studied literature has shown that the researchers’ efforts were directed towards finding
solutions to obtain a sustainable metal cutting process and their results are
considering reducing energy consumption and waste, increasing the amount of
reusable or recycling waste, limiting resource consumption and choosing alternative options for
lubricating and cooling the tool and part during the machining process. Among
these methods, dry and near-dry machining were found to be most
environmentally friendly solutions as there is no more or very little contamination with cutting fluids.
Nevertheless, these methods come with several disadvantages such as increased
heat generation and frictional forces, rapid tool wear and inefficient chips
removal but the researchers in this domain were investigating different methods and strategies to address these challenges, such as
new materials for cutting tools, coatings, surface texturing of cutting
tools, hybrid processes that combine dry machining with laser, ultrasonic,
vibrations etc. The current review focuses on the following developments in
cutting tool processing methods as a strategy to improve dry and near-dry
machining performance: cutting tools cryogenic treatment; coated cutting
tools; textured cutting tools and coated and textured cutting tools. For
these methods, based on the studie`d literature, some conclusions are
formulated on how they influence the cutting process in dry and near-dry
machining. Key words: sustainable production, dry and near-dry
machining, coated, textured, cryo-processed cutting tools, machining
performance. Analysis
of deformation and springback behavior of a freeform surface in the
automotive field Valentin CORZANU1,*l, Alina DUTA2l, Cristina TEISANU3l 1) Asistant Prof., PhD Student, Department of Engineering and Management
of Technological Systems, Faculty of Mechanics, University of Craiova, 200585
Craiova, Romania 2) Prof., PhD, Department of Engineering and Management of Technological
Systems, Faculty of Mechanics, University of Craiova, Romania 2) Assoc. Prof., PhD, Department of Engineering and Management of
Technological Systems, Faculty of Mechanics, University of Craiova, Romania https://doi.org/10.5281/zenodo.21873655 Abstract: The
paper presents a methodology for parametric modeling and numerical simulation
of a freeform surface using Autodesk Inventor and Altair Form software. The
surface geometry was generated based on the Witch of Agnesi curve defined on
an upper plane and two parallel lines defined on a lower plane, with the two
planes positioned parallel to each other. To evaluate the influence of
geometric parameters on the final shape and deformation behavior, four design
configurations were developed, corresponding to distances between the planes
of 20 mm, 30 mm, 40 mm, and 50 mm. The models created in Autodesk Inventor
were exported and utilized in Altair Form to design the tooling assembly (die
and punch) required for the sheet metal forming simulation. Crash-form
simulations were conducted to analyze the actual bending process and the
strain distribution within the blank. Subsequently, springback simulations
were performed to determine the elastic recovery of the sheet metal after
unloading and to evaluate the final geometric accuracy. The results highlight
the direct influence of the distance between the generating profiles on
surface curvature, stress distribution, and springback behavior. This study demonstrates
the importance of geometric parameterization and numerical simulation in
optimizing sheet metal forming processes for complex surfaces. Key words: Freeforms, Springback, Witch of Agnesi, Plastic Deformation, Aluminium. Design and development of an autonomous mobile
platform for optimizing logistics processes Daniela-Mariana ILIE1, Constantin-Adrian POPESCU2l, Emilia POPESCU3l, Costel Emil COTET4l 1) PhD Student, National University
of Science and Technology POLITEHNICA Bucharest, Romania 2) Lecturer, PhD, Robots and
Manufacturing Systems Department, National University of Science and
Technology POLITEHNICA Bucharest, Romania 3) Lecturer, PhD, Robots and
Manufacturing Systems Department, National University of Science and
Technology POLITEHNICA Bucharest, Romania 4) Prof., PhD, Robots and
Manufacturing Systems Department, National University of Science and
Technology POLITEHNICA Bucharest, Romania https://doi.org/10.5281/zenodo.22298807 Abstract: This article presents the design of an AMR
(autonomous mobile robot), as well as the main equipment and components
required for its construction and operation. The robotic platform developed is
intended for product transport and handling applications within logistics and
warehousing processes. In this context, the article presents the solutions
adopted for the mechanical structure, the locomotion system, and the lifting
mechanism, as well as the method for integrating the electrical and
electronic components. The article also highlights the sensor system used to
acquire the information necessary for the robot’s operation and the control
architecture based on ROS 2. The main structural and functional elements of
the platform are described, as well as the method of interconnection and
communication between them. Experimental evaluation across six scenarios
indicates an average reduction in energy consumption of 18.0% and in duration
of 12.5%, while the success rate increased from 87.3% to 96.5% compared to
classical A* planning. Keywords: AMR (autonomous mobile robots), energy planning, automation, logistics flow,
distribution warehouse, ROS 2, SLAM. Electronic mail: orgcom@icmas.eu
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