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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

  • Bent HANSEN

Teamwork and Project Management in Today’s Business

  • Monica IZVERCIANU, Mihai LOBONŢIU, Moise ŢUŢUREA, Ioan ABRUDAN, Vladimir MĂRĂSCU-KLEIN

Sustainable Companies

  • Soeren H. Jensen

Lean Manufacturing Analysing Projects by Student Groups in Small and Medium Size Enterprise Companies

  • Miroslav R. RADOVANOVIC

Cutting Technique with a Future

  • Britta Løck Worm

Engineers in a Global World. An Experience Report about the Internationalisation of OUC with an Organisational and Strategic Perspective

  • Ioan CIOBANU

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

  • Cătălin GHEORGHE

Aspects of the Machine Tools Remanufacturing

  • Laura GHIŢELARU

The composites, materials of present and future

  • Aurel LUNGULEASA

Researches about the Straightening of Veneer Waves

  • Ulpia MOTOC

"Just in Time" Production

  • Sorin Ion MUNTEANU, Ioan CIOBANU, Aurel CRIŞAN

Computation of the Real Solidification Module of Parts Cast in Composite Moulds

  • George NICOLAE

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

  • Victoria TOMA

Industrial Maintenance

  • Mihaela URDEA

C++ Application Developed for the Database Processing of the Angular Contact Ball Bearing Double Row


Bent HANSEN

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


Monica IZVERCIANU, Mihai LOBONŢIU, Moise ŢUŢUREA, Ioan ABRUDAN, Vladimir MĂRĂSCU-KLEIN

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


Soeren H. Jensen

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


Miroslav R. RADOVANOVIC

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


Ioan CIOBANU

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


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

» 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


Aurel FRATU, Mariana FRATU

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


Laura GHIŢELARU

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


Aurel LUNGULEASA

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


Ulpia MOTOC

"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


Sorin Ion MUNTEANU, Ioan CIOBANU, Aurel CRIŞAN

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


George NICOLAE

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


Ioan PANTEA, Horia TÂRZIU

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


Victoria TOMA

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


Mihaela URDEA

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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