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Recent 13

Vol. 6 (2005), Nr. 1 (13)

Numărul 13 al Revistei RECENT a fost:

  • realizat în colaborare cu Asociaţia Română de Tehnologii Neconvenţionale

  • editat şi multiplicat cu sprijinul:

- Universităţii "Transilvania" din Braşov

- Consiliului Judeţean Braşov (prin Comisia de Cultură, Învăţământ, Cercetare, Culte şi Muzeul Judeţean de Istorie Braşov)


CONTENTS

  • Vasile BEJAN

ACFT criteria analysis method, used to establish quality/price ratio of industrial products

  • Romeo CIOARĂ

About the calculus of block brakes used on power presses

  • Ioan CIOBANU

Theoretic study of the influence casting temperature on the casting fluidity of the irons

  • Adriana FOTA

Balanced automation in flexible manufacturing systems

  • Virgil GEAMĂN, Iulian Ioan ZAHARIA, Florin Victor STROE

Effect of foaming metals configuration on expansion for aluminium powders

  • Catalin GHEORGHE

Model for the environment functions used in the machine tools building field

  • Virgil GRECU

The analysis of the influence on the main technical indicators of the resistance structure and of the materials used in window construction

  • Mihai IONESCU

The logical sequence modules (LMS)

  • Aurel LUNGULEASA

Simple tighten devices for wood gluing achievement

  • Ionel MARTINESCU

Systems with parallel structure k of n elements

  • Ioan MILOŞAN

Researches about the behavior to the low temperatures of an alloyed cast iron

  • Sorin Ioan MUNTEANU, Ioan CIOBANU, Aurel CRIŞAN

The use of the real solidification module as an indicator for castings macro-solidification analysis

  • Mircea NEAGOE, Theodor POROJAN, Vladimir MĂRĂSCU-KLEIN

WBT WORLD – a Leonardo da Dinci pilot project for web-based trainers

  • George NICOLAE

Noise in TV channel. Noise measuring at TV receiver entrance (3rd Part)

  • Maria PANTELIMON, Ioan GIACOMELLI
Study about the heat and thermochemical treatments in controlled atmosphere
  • Tudor PĂUNESCU

GLSCENE-OPENGL – Effective tools for industrial robots simulation


Vasile BEJAN

ACFT CRITERIA ANALYSIS METHOD, USED TO ESTABLISH QUALITY/PRICE RATIO OF INDUSTRIAL PRODUCTS

» Abstract. Is important to establish a characteristic that correctly describe the ratio between quality and price of industrial products. ACFT method, promoted by the author, is allowing that. The paper underline the particularities in application of this method at evaluate the quality/price ratio for different industrial products.

» Keywords: quality/price ratio, ACFT method, industrial products


Romeo CIOARĂ

ABOUT THE CALCULUS OF BLOCK BRAKES USED ON POWER PRESSES

» Abstract. For the power presses, the brakes are assemblies with an important purpose in the well functioning of these machines. It is amenable the importance for the accurate calculus of these assemblies. The paper presents the specific expressions established for the calculus of block brakes used on power presses and underlines the possibility of using a generalized equation applicable for the calculus of any friction clutch or brake that belongs to a power press. It also presents the stages that must be followed in order to adjust the calculus of a block brake.

» Keywords: block brake, calculus, power press


Ioan CIOBANU

THEORETIC STUDY OF THE INFLUENCE CASTING TEMPERATURE ON THE CASTING FLUIDITY OF THE IRONS

» Abstract. The paper presents a mathematic model for calculating of casting fluidity for the liquid alloys. There are given some application examples for the mathematic modelling of the study for the influence of casting temperature on the casting fluidity in the case of white eutectics irons.

» Keywords: casting, casting fluidity, grey cast iron


Adriana FOTA

BALANCED AUTOMATION IN FLEXIBLE MANUFACTURING SYSTEMS

» Abstract. Partly due to the introduction of computers and intelligent machines in modern manufacturing, the role of the operator has changed with time. More and more of the work tasks have been automated, reducing the need for human interactions. One reason for this is the decrease in the relative cost of computers and machinery compared to the cost of having operators. Even though this statement may be true in industrialized countries it is not evident that it is valid in developing countries. However, a statement that is valid for both industrialized countries and developing countries is to obtain balanced automation systems. The way of reaching this goal, however, might be different depending on the place of the manufacturing installation. Aspects, such as time, money, safety, flexibility and quality, govern the steps to take in order to reach a balanced automation system. In this paper there are defined six steps of automation that identify areas of work activities in a modern manufacturing system that might be performed by either an automatic system or a human.

» Keywords: balanced automation systems, flexible manufacturing systems, quality control


Virgil GEAMĂN, Iulian Ioan ZAHARIA, Florin Victor STROE

EFFECT OF FOAMING METALS CONFIGURATION ON EXPANSION FOR ALUMINIUM POWDERS

» Abstract. Foamed metals are attractive engineering materials offering, in particular, the benefit of a high energy absorbing capacity. The powder metallurgy route is an attractive method for making Al foam components as it offers the possibilities of near net shaping. Producing foam products from powders involves mixing and compacting metal powder with a gas-producing foaming agent such as TiH2. The resulting precursor is then heated above the decomposition temperature of the foaming agent and the melting point of the metal powder. This causes the molten compact to expand, resulting in a highly porous material with closed cells.

» Keywords: foamed metals, powder metallurgy


Cătalin GHEORGHE

MODEL FOR THE ENVIRONMENT FUNCTIONS USED IN THE MACHINE TOOLS BUILDING FIELD

» Abstract. The economic theory presents different instruments and their combinations for the environment functions using. The article proposes a new instrument, under the environment cost form, included in the manufacture cost with application on the machine tools building field.

» Keywords: instrument, environment, model, economy, machine tool


Virgil GRECU

THE ANALYSIS OF THE INFLUENCE ON THE MAIN TECHNICAL INDICATORS F THE RESISTANCE STRUCTURE AND OF THE MATERIALS USED IN WINDOW CONSTRUCTION

» Abstract. The work is part of a study referring to the way the main materials used in window construction influence the main technical and qualitative indicators. Therefore, several aspects are analyzed, regarding the influence of the materials used for the resistance structures and of the window-glasses on the thermal transfer, on the specific infiltration and on the acoustic isolation. The materials composing the window structures exert different kinds of influence on the indicators. The share of the influence varies according to the role the materials play in the window structure, on the properties of the materials and on their position.

» Keywords: materials, windows, influence, technical indicators


Mihai IONESCU

THE LOGICAL SEQUENCE MODULES (LMS)

» Abstract. In the present paper the author wants to determine the performances of the SLM, which is the base in the sequential pneumatic commands. To achieve this goal he uses optical sensors, made by the author, which are connected to a computer that, using appropriate software, measures the response times. These times are compared to those obtained by simulation of a pneumatic circuit with an electronic circuit, using SPICE program.

» Keywords: logical sequence module, sensors


Aurel LUNGULEASA

SIMPLE TIGHTEN DEVICES FOR WOOD GLUING ACHIEVEMENT

» Abstract. This work-paper has as reason the knowledge of some simple tighten devices for realizing the gluing of two or more wooden pieces, and so the methodology of calculate for tighten devices used in industry. Also, it put in evidence the calculation and relationship of screw or wedge machinery for some simple devices used in wood industry.

» Keywords: screw device, tighten device with wedge, tighten force, tighten machinery


Ionel MARTINESCU

SYSTEMS WITH PARALLEL STRUCTURE k OF n ELEMENTS

» Abstract. The systems with parallel structure k of n elements are systems with active partial redundancy, on which k elements authorize the functions of the assembly. The paper presents the determination of some reliability parameters and their variation – the reliability and the mean time – depending on the number of elements which form the system.

» Keywords: system, reliability, mean time, redundancy


Ioan MILOŞAN

RESEARCHES ABOUT THE BEHAVIOR TO THE LOW TEMPERATURES OF AN ALLOYED CAST IRON

» Abstract. The paper presents an application of classical isothermal heat treatment over the structure and properties of Ni-Cu low-alloy S.G. cast iron type A.D.I. It is pointed out the influence of low temperature (- 50 °C) over the structure and the KC properties of the studied cast iron.

» Keywords: cast iron, mechanical properties, heat treatment


Sorin Ioan MUNTEANU, Ioan CIOBANU, Aurel CRIŞAN

THE USE OF THE REAL SOLIDIFICATION MODULE AS AN INDICATOR FOR CASTINGS MACRO-SOLIDIFICATION ANALYSIS

» Abstract. The authors propose a new concept to characterize the castings from the solidification view point that is named the real solidification module. It is shown that the solidification module, so that is calculated till now (the rapport between the casting volume and its contact aria with mould and cores) and called by the authors the ideal solidification module, isn’t always correlated with the solidification time of castings. For this reason there is proposed a new equation to calculate the solidification module. This attends to the real solidification conditions of castings inside the mould.

» Keywords: solidification module, shape factor, casting


Mircea NEAGOE, Theodor POROJAN, Vladimir MĂRĂSCU-KLEIN

WBT WORLD – A LEONARDO DA DINCI PILOT PROJECT FOR WEB-BASED TRAINERS

» Abstract. The project WBT WORLD RO/02/B/F/PP 141053, entitled “Building a Web-Based Trainers’ Wide Open Resource for Learning and Development”, is a pilot project founded by European Commission, Education and Culture Directorate, through the Romanian Leonardo da Vinci Agency. WBT WORLD is an 18 months project and it was started on 1 August 2004, under the coordination of Transilvania University of Brasov. The project WBT WORLD is addressing to the people who design and deliver web-based courses. The growing need for this kind of courses leads to the initiation and development of a new profession: Web-Based Trainers (WBT).

» Keywords: Web-based Trainers, on-line courses, Leonardo da Vinci pilot project


George NICOLAE

NOISE IN TV CHANNEL. NOISE MEASURING AT TV RECEIVER ENTRANCE (3rd PART)

» Abstract. This paper presents the experimentally results of noise measuring at TV receiver input. Aiming for establishing the influence of the noise on the TV image quality recomposed inside the TV receiver at the end of the transmission channel in different conditions and for a relatively long period of time, the following acquisition system was used: a noise analyzer, a high resolution I/O card and a computer for the process flow control and information processing. The measurements campaign was focused on measuring the noise level at the input of the television receiver and processing the data for identifying the character of the noise that predominantly affects image quality. The data acquisition system was used to measure various parameters of fluctuation noise at TV receiver entrance. These parameters are important in understanding the noise influence on the quality of received images. The experimentally measurements were concentrated onto determining the characteristics of the noise in UHF frequency band TV channels.

» Keywords: radio communications measuring system noise, noise in TV channel, fluctuation noise


Maria PANTELIMON, Ioan GIACOMELLI

STUDY ABOUT THE HEAT AND THERMOCHEMICAL TREATMENTS IN CONTROLLED ATMOSPHERE

» Abstract. The purpose of this paper is to create an image on carburization process performances, achieved in different working fields, equipments and new processes, developed to increasing the needs for productivity of varied treated pieces, to reduce the environmental pollution and the production costs.

» Keywords: controlled – atmosphere, vacuum carburization and plasma carburization


Tudor PĂUNESCU

GLSCENE-OPENGL – EFFECTIVE TOOLS FOR INDUSTRIAL ROBOTS SIMULATION

» Abstract. This paper analyzes the most popular simulation tools for industrial robots. Is presented fully functional 3D simulation software applied on a specific manipulator model RV-M1 (Movemaster EX), manufactured by Mitsubishi, for offline and teach-in programming. Implementation language is Delphi & GLScene (OpenGL). This simulation package increases the robot engineering productivity in the development process; moreover it could be used as a virtual training manipulator.

» Keywords: 3D simulation package, industrial robot, GLScene, OpenGL


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