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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 12, Issue 3, 2017
· Andrei Dragos
BORS, Gheorghe BRABIE, Bogdan CHIRITA, Experimental research concerning the bending of AZ31 magnesium alloy sheets · Anişoara
CORĂBIERU, Ştefan VELICU, Petrică CORĂBIERU, Dan Dragoş
VASILESCU, Ionel PĂUNESCU, Research on the structure of metal parts manufactured by the innovative procedure of combined processing operations The relevance of fixed costs in the diagnosis of operating risk to SME’s · Daniela
CIOBOATĂ, George CONSTANTIN, Aurel ABĂLARU, Dănuţ
STANCIU, Cristian LOGOFATU, Ionuţ GHIONEA, Method and system for measurement of railway wheels rolling surface in re-shaping process · Mihai-Alin
STAMATE, Adrian-Florin NICOLESCU, Cristina PUPAZĂ, Mathematical model of a multi-rotor drone prototype and calculation algorithm for motor selection · Andrei
Mario IVAN, Radu Constantin PARPALĂ, Laurențiu POPA, Cezara COMAN, Evaluation of articulated arm robot accuracy using a laser interferometer · Radu
ConstantinPARPALĂ, Laurențiu Cicerone POPA, Andrei Mario IVAN, Designing
an Internet of Things (IoT) ready device for machine tool monitorizing
1) PhD Student, Departament of Industrial Engineering, Vasile Alecsandri
University of Bacau, Romania 2) Prof., PhD, Departament of Industrial Engineering, Vasile
Alecsandri University of Bacau, Romania 3) Prof., PhD, Departament of Industrial Engineering, Vasile Alecsandri University of
Bacau, Romania Key words: springback angle, bending angle, springback radius, forming
speed, blankholder force. Research
on the structure of metal parts manufactured by the innovative procedure of
combined processing operations Anişoara Corăbieru 1, Ştefan Velicu 2,
Petrică Corăbieru 3, Dan Dragoş Vasilescu 3,
Ionel PĂunescu 2 1) Lecturer,
Technical University Gheorghe Asachi of Iasi, Romania 2) Prof., PhD, University
"Politehnica" of Bucharest, Romania 3) Scientific Researcher II, PhD, SC Procomimpex SRL
Iasi, Romania Abstract: The analysis
of the structure of metal parts made by the innovative technological
procedure of combined processing operations requires the investigation of
parts by electronic and optical microscopy and micro-hardness determinations.
In most investigations, the structural analysis reveals a homogeneous,
finished, predominantly martensitic structure with micro-alloying elements
finely dispersed in the form of complex carbides. The agglomerations of
chemical elements such as Si, Mn and C in the form of strips and strings are
rare and they are completely missing in the form of mesh. The optimization
measures aim to reduce and eliminate the agglomerations because these ones
create inhomogeneities that lead to variations of the properties during
utilization conditions. Optimization deals especially with the values of the
main technological parameters for the technological phase of liquid form
micro-alloying and for the technological phase of induction heat treatment.
The optimization measures that are required and the conclusions that are
drawn support the viability of the innovative technological procedure of
combined heat treatment. Key words: structure,
combined heat treatment, agglomerations. The relevance of fixed costs in the diagnosis of
operating risk to SME’S Nicolae BOIAN * PhD, Associate Professor,
Department of Engineering and Management in Food and Tourism, University
“Transilvania”, Brasov, Romania Abstract: Due to their weak capitalization and low negotiation power on the
market, small and medium-size enterprises (SME) have a high vulnerability
to changes in the environment they
operate. These vulnerabilities
can significantly increase the operational risk of the business, going as far
as compromising it. Particularly in areas of activity where technical capital
is a business force, the level of fixed costs can be the main factor of
operational risk. In view of this, the present paper aims to develop a simple
and effective instrument for assessing operating risk to SME’s based on
variation of some main indicators such as total sales, prices, fixed costs,
variable costs. The proposed risk evaluation model, use two aggregate
indicators: degree operating leverage (DOL) and business security interval
(IS), calculated as an expression of enterprise’s economic
performance, market position and level of capitalization (investment).
Following the trend of these indicators is evaluated the trend of the
operational risk of the business. The method proposed for evaluation of
operating risk includes the main steps that are required to be followed under
scientific control. These are presented in a decisional logic structure, in
order to optimize the management decision in terms of minimizing the risk of the
business which is objectively assessed through calculation. This way
increases significant the applicative character of the method. The paper includes a
case study to illustrate how to apply the method to a SME’s type company. Key words: operating risk, fixed costs, variable cost margin, security interval,
investments. Method
and system for measurement of railway wheels rolling surface in re-shaping
process Daniela CIOBOATĂ1,*, George CONSTANTIN 2, Aurel ABĂLARU1, Dănuţ
STANCIU1, Cristian LOGOFATU1, Ionuţ
GHIONEA3 1) PhD, Eng., Senior
researcher, National Institute of
Research and Development in Mechatronics and Measurement Technique,
Bucharest, Romania 2) PhD,
Prof., Machines and Manufacturing Systems Department, University
"Politehnica" of Bucharest, Bucharest,
Romania 3) PhD., Lecturer, Department of Machine
Manufacturing Technology, University “Politehnica” of Bucharest, Bucharest,
Romania Abstract: Train
wheel Key words: wheel
set; railway
wheel profile measurement; railway wheel wear; numerical model; in-workshop
inspection, railway wheel reshaping. Mathematical model of a multi-rotor drone prototype
and calculation algorithm for motor selection Mihai-Alin STAMATE1*, Adrian-Florin NICOLESCU2,
Cristina PUPAZĂ2 1) PhD Student, Eng., Machines and Manufacturing Systems
Department, University "Politehnica" of Bucharest, Romania 2) Prof., PhD, Machines and Manufacturing Systems
Department, University "Politehnica" of Bucharest, Romania Abstract: This
paper presents the theoretical stages for developing the mathematical model
of a multirotor drone used for security applications and applicative works
for development of the calculation algorithm necessary to determine the best
choice of brushless motors which will equip the drone, based on the payload
mounted onboard the drone and the specific mission that the drone is going to
perform. First part of the paper presents the kinematics and dynamics
modeling of the drone operation principles. It includes coordinates systems
description, matrix description of roll-pitch - yaw individual and global
rotation motions, as well as appropriate forces and torques acting on the
drone system. Second part of the paper presents full calculation algorithm
for motor selection, the procedure followed up to verify the resulted
configuration for hexacopter's driving system as well as the virtual 3D
prototype of the hexacopter achieved using SOLIDWORKS CAD software. Final
aspects including electronic wiring and constructive - functional aspects
related to hexacopter's on the board electronics are included too. Key words: calculation algorithm, hexarotor
drone, drone prototype, brushless motor, motor selection. Evaluation of articulated arm robot accuracy using a
laser interferometer Andrei Mario IVAN1,*, Radu Constantin
PARPALĂ2, Laurențiu POPA3, Cezara COMAN4 1) Lecturer, PhD, Machines and Manufacturing Systems
Department, University "Politehnica" of Bucharest, Romania 2) Lecturer, PhD, Machines and Manufacturing Systems
Department, University "Politehnica" of Bucharest, Romania 3) Lecturer, PhD, Machines and Manufacturing Systems
Department, University "Politehnica" of Bucharest, Romania 4) Lecturer, PhD, Machines and Manufacturing Systems
Department, University "Politehnica" of Bucharest, Romania Abstract: This article presents the
first stage of the work performed by the authors regarding robot accuracy
evaluation. This stage focuses on measuring the variations in robot's
accuracy values during a linear movement of the tool along a direction
parallel to the Y axis of the base frame. The experimental procedures were
conducted using a Kawasaki FS 10 E articulated arm robot with six degrees of
freedom and the measurements were done using a Renishaw ML10 laser
interferometer. The accuracy values at various points on the trajectory were
recorded using different movement speeds, in order to evaluate the influence
of trajectory speed on the accuracy levels and the speed levels at which the
robot can be programmed for precise tasks. Furthermore, the measurements were
conducted for both the programmed path along the Y axis of the base frame and
for the reversed trajectory. For results analysis, a comparison with previous
experimental procedures regarding robot volumetric precision was made,
including a study of precision levels across the robot's workspac, which was
considered as a basis for these measurements. Future research directions
include analyzing the accuracy levels of the robot along the X axis of the
base frame and evaluating the repeatability of the arm, with the final goal
being to apply a calibration procedure based on the experimental results in
order to improve the overall volumetric precision of the robot. Key words: industrial robot, laser
interferometer, accuracy, volumetric precision, linear trajectory. Designing an Internet of Things (IoT) ready device
for machine tool monitorizing Radu Constantin
PARPALĂ1,*, Laurențiu Cicerone POPA2, Andrei
Mario IVAN3 1) Lecturer, PhD, Machines and Production System
Department, University Politehnica from Bucharest, Romania 2) Lecturer, PhD, Machines and Production System
Department, University Politehnica from Bucharest, Romania 3) Lecturer, PhD, Machines and Production System
Department, University Politehnica from Bucharest, Romania Abstract: Nowadays more and more
companies are using active monitoring systems for predictive maintenance of
the manufacturing systems. With Industry 4.0 revolution almost all modern production
systems are able to monitor the production systems and to send data values to
monitoring platform. The main issue appears when using older machines that
lack the basic communication capabilities, in this case sometimes
supplementary equipment are needed to connect the required machine. The IoT
platforms represents an alternative to the classical monitoring platforms as
usually integrates tools and utilities needed to facilitate some common
actions like sending emails and SMS alerts. This paper presents research
results regarding an IoT ready device for industrial environment capable of
connecting machines and production equipment through the internet to a smart
process monitoring platform based on IoT. Key words: Internet
of Things (IoT), monitoring platform, industrial communications, Industry
4.0. Electronic mail: orgcom@icmas.eu |
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