Recent
15
|
Vol.
6 (2005), Nr. 3 (15) |
The 15th issue of RECENT journal was edited and
multiplied with support of:
-
Transilvania University of Brasov,
Romania
-
Romanian Association for Nonconventional Technologies
-
Brasov County Council (by Scientific Activities,
Education, Culture, Cults Committee), Romania
CONTENTS
Teamwork and Project Management in Today’s Business
- Monica IZVERCIANU, Mihai LOBONŢIU, Moise ŢUŢUREA, Ioan ABRUDAN,
Vladimir MĂRĂSCU-KLEIN
Sustainable Companies
Lean Manufacturing Analysing Projects
by Student Groups in Small and Medium Size Enterprise Companies
Cutting Technique with a Future
Engineers in a Global World. An
Experience Report about the Internationalisation of OUC with an
Organisational and Strategic Perspective
Researches Regarding the Influence of the
Feeders Construction on the Inclusions Retention Inside the Pouring
Gates
- Aurel CRIŞAN, Ioan CIOBANU, Sorin Ioan MUNTEANU
The
Application of Real Solidification Modules Method in the View to Assure
Uniform Solidification for Cast Wheels with Small Dimensions
- Aurel FRATU, Mariana FRATU
The Problem of Operational Space
Control for Redundant Robots
Aspects of the Machine Tools
Remanufacturing
The composites, materials of present and
future
Researches about the Straightening
of Veneer Waves
"Just in Time" Production
- Sorin Ion MUNTEANU, Ioan CIOBANU, Aurel CRIŞAN
Computation of the Real Solidification Module of Parts Cast in
Composite Moulds
Noise in TV Channel. Noise
Measuring at TV Receiver Entrance (5th Part)
- Ioan PANTEA, Horia TÂRZIU
The Study of the
Relative Speed for the Simulation of a Technological Process
Industrial Maintenance
C++ Application Developed for the Database Processing of the
Angular Contact Ball Bearing Double Row
TEAMWORK AND PROJECT MANAGEMENT IN TODAY’S BUSINESS
» Abstract. During the last decades
teamwork has become an important part of competitiveness in the
industrial business. Companies have seen the synergies and benefits in
cross-organisational teams utilising the different deep knowledge from
specialists. A severe demand for successful and global companies is to
be able to develop their products for the global market with a speed
giving them the competitive advantage – this requires efficient
international teamwork between different cultures. Engineers are some of
the employed just in the middle of this development and need these
qualifications from their education as a basis. These new engineers need
personal qualifications which are very much focussed on the team goal,
the peak capabilities of the other team members, assertive behaviour,
openness, respect to other people who ever they are, neglect the
personal stress factors and so on. These capabilities can be learned and
trained during their education in the universities. The institutions and
the professors have to take that into consideration as a substantial
part of their education programs.
» Keywords: teamwork, industrial
business, project management, education, personal qualification
SUSTAINABLE COMPANIES
» Abstract. A company, as a system,
submits to the sustainable development concept, because the sustainable
development satisfies the requirements according to continuous
functioning, of each existing system, on an undefined future and without
exhausting the main resources. From these points of views in sustainable
companies the technology has to become itself a resource pf specific
management, the management of technology.
» Keywords: sustainable companies,
resource management, technology management
LEAN MANUFACTURING ANALYSING PROJECTS BY
STUDENT GROUPS IN SMALL AND MEDIUM SIZE ENTERPRISE COMPANIES
»
Abstract. Companies working according to the LEAN concept achieve
remarkable improvements in efficiency. In Denmark larger companies
already have adopted the Lean Thinking to a certain extent. However, the
industrial structure in Denmark consists of many SME companies (Small
and Medium size Enterprise companies) and a small number of larger
companies. Many SME companies now wish to follow this track. For the
production engineer, it is a core competence to get the most value out
of the resources of the company and to make products most efficiently
through analysing. To fulfil this task, the production engineer must
combine knowledge about technology and logistics in order to maximize
value added according to the production and the production control. This
paper presents typical results achieved by adopting the Lean concept
compared to results and problems shown in these projects from very
different SME companies. The projects are performed by students in
groups of three to five, as part of their 4th semester of the B.ENG. in
Manufacturing and Management. Key words in the projects are: LEAN
Manufacturing (how to get started), Value Stream Mapping (current state-
and future state mapping) and LEAN Tools. The projects involve Plan of
Information to company and employees, Plan of Implementation and
Management Summary (Management Report). The Projects may also involve
related ideas such as Kanban, QRM (Quick Response Management), TPM
(Total Productive Maintenance), OEE (Overall Equipment Efficiency), TQM
(Total Quality Manufacturing), Lean Accounting and ABC (Activity Based
Costs).
»
Keywords: lean projects by students, value stream analysis, plan of
implementing, related ideas, report
CUTTING TECHNIQUE WITH A FUTURE
» Abstract. Plasma cutting is
advance thermal cutting method. It is a process where an open arc can be
constricted by passing through a small nozzle from the electrode to the
workpiece. Plasma is generated by exposing a gas stream to the electrons
from an electric arc. High velocity electrons generated by the arc
impact gas molecules, and ionize them. Plasma cutting utilizes
electrically conductive gas to transfer energy from an electrical power
source through a plasma cutting torch to the metal being cut. It does
not require a preheat cycle, cuts any metal that conducts electricity,
minimizes the heat affected zone, and yields a cut with a small kerf.
Cuts can be made from thick foil thickness up to 250 mm thick plate.
Today, it is used on nearly all types of conducting engineering metals,
such as: carbon steels, stainless steels, aluminium, copper, brass, cast
metals, and exotic alloys. Precise cut with square kerf, clean face and
dross free enables plasma cutting to be finish machining operation. The
basic plasma cutting system consists of a power supply, an arc starting
circuit and a torch. These system components provide the electrical
energy, ionization capability and process control that is necessary to
produce high quality, highly productive cuts on a variety of different
metals. The power supply is a constant current power source. The output
current (amperage) of the power supply determines the speed and cut
thickness capability of the system. The main function of the power
supply is to provide the correct energy to maintain the plasma arc after
ionization. The arc starting circuit is high frequency generator circuit
that produces an voltage of 5 000 to 10 000 volts at approximately 2
megahertz. This voltage is used to create a high intensity arc inside
the torch to ionize the gas, thereby producing the plasma. The torch
serves as the holder for the consumable nozzle and electrode, and
provides cooling (either gas or water) to these parts. The nozzle and
electrode constrict and maintain the plasma jet. The power source and
arc starter circuit are connected to the torch via interconnecting leads
and cables. These leads and cables supply the proper gas flow,
electrical current flow and high frequency to the torch to start and
maintain the process. The high investment costs is one limiting factor
for application of the plasma cutting machines. The trend today is
making plasma cutting process a realistic alternative to other cutting
methods.
» Keywords: technique, advance
technology, cutting, plasma cutting, characteristic
 Britta
Løck WORM
ENGINEERS IN A GLOBAL WORLD. AN
EXPERIENCE REPORT ABOUT THE INTERNATIONALISATION OF OUC WITH AN
ORGANISATIONAL AND STRATEGIC PERSPECTIVE
» Abstract. Globalisation influences
all perspectives of society today and thus also the engineering
education. Denmark, being a high-income country cannot compete on it’s
engineer’s technical excellence alone, as companies start to outsource
not only their production but also development, i.e. traditional
engineering tasks. Consequently graduates have to meet new demands in
order to stay valuable on the job market. Odense University College of
Engineering started at process to educate engineers with a broader set
of skills apart from the academic and technical ones and
internationalisation is one of the tools. This article will be
addressing internationalisation of engineering programmes on the basis
of the internationalisation process at Odense University College of
Engineering. The article will focus on first the development of
strategies and activities and then the organisational impact, problems
and challenges combined with executing the strategy. Finally, the
article will conclude on a number of important principles or pieces of
advice when internationalising an institution. Last but not least, we
will address some of the future challenges for the internationalisation
process at Odense University College of Engineering in particular and
higher education institutions in Denmark in general.
» Keywords: globalisation,
engineering education, strategies, organisational impact
RESEARCHES REGARDING THE INFLUENCE OF
THE FEEDERS CONSTRUCTION ON THE INCLUSIONS RETENTION INSIDE THE POURING
GATES
» Abstract. The paper presents the
results of an experi-mental study made by physical modeling. The study
refers to the influence of the feeders construction on the inclusions
retention inside the pouring gates. The objects of the study were the
pouring gates with four feeders on the runner, considering four types of
the construction of the feeder. It has been made determinations in the
condition of pouring starting (starting work condition) and in
stationary tap condition (permanent work condition-the pouring gate
filled by liquid).
» Keywords: casting, pouring gate,
inclusions, feeders
THE APPLICATION OF REAL SOLIDIFICATION
MODULES METHOD IN THE VIEW TO ASSURE UNIFORM SOLIDIFICATION FOR CAST
WHEELS WITH SMALL DIMENSIONS
» Abstract. In the paper there is
presented a study regarding the real solidification modules application
in the view of solidification analysis of wheel type castings. There are
calculated the partial solidification modules for the wheel components
and dead heads used in seven variants. It is highlighted that the
analysis of wheels solidification using ideal solidification modules (geometrical)
lead to errors. There is evidenced as constructive measure to obtain
uniform solidification of the wheel, the disk thickness diminish
comparing to rim or hub thickness.
» Keywords: casting, solidification
module
THE PROBLEM OF OPERATIONAL SPACE CONTROL
FOR REDUNDANT ROBOTS
» Abstract. Robots manipulator’s
motions are typically specified in the operational space – the robotic
task space – in the terms of the time history of the end-effector’s
position, velocities and acceleration. This approach is devoted to
control of rigid redundant robots manipulator in the operational space.
In this approach, we will analyze an important property of redundant
robots manipulator, namely redundancy.
» Keywords: redundancy, redundant
robot, control
Cătălin GHEORGHE
ASPECTS OF THE MACHINE TOOLS
REMANUFACTURING
» Abstract. The article presents a series
of aspects regarding the machine tools remanufacturing. Starting with
the options of the machine tools that has finished its life cycle is
presented the specific recovery terminology and under the simple
questions form is reasoned the machine tools remanufacturing importance
and necessity.
» Keywords: machine tools, remanufacturing,
life-cycle, environment
THE COMPOSITES, MATERIALS OF PRESENT AND
FUTURE
» Abstract. The rapid development of the
composites was generated by the necessity of finding new solutions in
different technical domains and has the purpose to improve and optimize.
Substituting the conventional classic metal structures, with the
composite structure there are many advantages due to high stiffness and
resistance. Joints of composites, bonded or bolted, began more and more
to replace the metal joints. Because of this, and many more reasons, the
design with composites became a very attractive subject for the
researchers, to discover new materials and to expand their utility in
the most diverse domains.
» Keywords: composites, bolted /bonded
joints, composites structures
RESEARCHES ABOUT THE STRAIGHTENING OF
VENEER WAVES
» Abstract. This article is about
environment protection in a cutting tools production system. It treats
problems about water, air and sol protection measures, sonorous and
thermo pollution and finally classify wastes in metallic wastes (metal
chips, ends and bar ends, pieces resulted from dissembles), nonmetallic
wastes (paper wastes, plastic wastes, glass wastes, blown lubricant, gum
elastic, bricks, abrasive blade, wood chips), asbestos, slime, residual
water, grinding compound and garbage.
» Keywords: veneer waves, installation for
straightening
"JUST IN TIME" PRODUCTION
» Abstract. There are two systems which
dominated the production within the company in the last decades. Two
elements characterize the respective concepts. One of them has the name
"Just in Time" being an extremely important factor is the assembly
industry where each product should be realized only in the demanded
quantity, at the demanded time, the stock being reduced to the minimum.
The second factor is destined to stimulate the active participation of
the employees to the production improvement and to the improvement of
the working conditions.
» Keywords: Just in Time, 5S, quality of
products, inventory, Kaizen
COMPUTATION OF THE REAL SOLIDIFICATION
MODULE OF PARTS CAST IN COMPOSITE MOULDS
» Abstract. The real solidification module
of castings is influenced by thermo-physical characteristics of the
moulds. In this paper there is established the equation to compute the
cooling coefficients which participate to real solidification module
computation in the case of casting surfaces that are in contact with
external coolers or heat insulation materials.
» Keywords: solidification module, castings
NOISE IN TELEVISION CHANNEL. NOISE
MEASURING IN THE TV RECEIVER (5th Part)
» Abstract. This article (and the following
ones) presents the experimental results regarding the measuring of the
signal report – the noise in the television receiver in different
conditions of reception. The experimental measurements were concentrated
for the determination and the establishing of the practical methodology
to determine the signal-noise report in different measure points of the
TV receiver. The measurements have been effected with a system of the
measuring machines that have aloud the establishing of the TV signal’s
level to the entrance of the TV receiver. And the making of measuring
with the help of the digital oscilloscope with his memory connected to
the computer by interface RS – 323. The processing of the measurement’s
results, stocked on the computer had aloud the establishing of
conclusions regarding the correlation between the TV image quality and
the signal-noise report, measured at the exit of the video demodulator
and at the exit of the video-frequency amplifier. The experimental
measurements have aloud the establishing of new methodologies of
measuring making in the TV receivers for establishing the performance
parameters of these, in the processing and remaking of the image
information.
» Keywords: TV channel noise, noise in
television, signal-noise ratio measuring, fluctuation noise in TV
THE STUDY OF THE RELATIVE SPEED FOR THE
SIMULATION OF A TECHNOLOGICAL PROCESS
» Abstract. The problem of calculating the
geometry of the knives used for toothing conical gears with curved teeth
is the following: knowing the generating curve of the plane wheel, it is
required to determine the profile of the chipping edge of the knife and
the profile of the abrasive tool used for relieving that will ensure a
minimal amount of errors on resharpening. The optimal shape of the
positioning surfaces of the knife, as a mathematical expression of the
conditions imposed upon the tool, is Archimedes’s helix. The profile of
the chipping edge in the calculus section is determined by intersecting
the knife’s reliving surface plane with the generating curve. The paper
determines the relative speed of the processing with the purpose of
using it on simulating the kinematics of the technology of processing
the profile of the knives used for toothing conical gears with curved
teeth.
» Keywords: normal line, tangent, relative
speed, chipping edge, toothing knife
INDUSTRIAL MAINTENANCE
» Abstract. This study has in view to
define the term of Maintenance by pointing out Preventive Maintenance,
to present the evolution of this concept, different types of maintaining
activities used within industrial companies during the times, on
world-wide level and in Romania, the TPM strategy, to harmonize
Maintenance with the Quality System Management, trends of development.
» Keywords: Maintenance, Preventive
Maintenance, Conditional Maintenance, Total Productive Maintenance (TPM),
5S
C++ APPLICATION DEVELOPED FOR THE
DATABASE PROCESSING OF THE ANGULAR CONTACT BALL BEARING DOUBLE ROW
» Abstract. The present paper is oriented
in the direction defined by the development of applicable software with
C++ language, to processing the database for the angular contact ball
bearing double row 32. The main objective of the project is creating a
database, necessary for the informatics approach of constructive and
technological design and manufacturing of the ball bearing and sketching
of them. The initial sketch, drawing in AutoCAD, named pattern sketch,
for the angular contact ball bearing double row, was associated to some
groups of ball bearing drawing. At the end, final drawings result, for
the given ball bearings.
» Keywords: angular contact ball bearing
double row, C++ language, databases, AutoCAD, Script files
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