Table of Contents

  • METHODOLOGICAL ASPECTS OF A SUSTAINABLE DEVELOPMENT TRAINING IN THE HIGHER EDUCATION IN BULGARIA

    pg(s) 10-12

    Learning different aspects of the international quality standards turned into an urgent necessity in the students’ training, which gives them a possibility quickly to adapt to the practice during their professional realization as specialists. Generally, the preparation of the students of quality management in our country is well accepted in the different educational institutions and is conformable to their specific features. As a disadvantage it may be shown the fact, that the students’ training is limited only to the knowledge for quality management receiving. It may achieve a wider range, including a preparation for environment standards (ISO 14000), for safety (ISO 18000) and for quality, which basic principles further the management of this combination and, in the long run, for one sustainable development.

    The purpose of the present article is to be worked-out and presented the basic methodological aspects for sustainable development training in the higher education, which will give an opportunity to the students to receive wider knowledge in this field.

    With the help of the basic methodological aspects, has been worked-out a concrete model syllabus for sustainable development training of the students from the higher technical schools in our country.

  • INFLUENCE OF PARAMETERS BY ELECTRONIC RAY ON PROPERTIES OF SUPERFICIAL LAYERS OF OPTICAL ELEMENTS OF EXACT INSTRUMENT-MAKING

    pg(s) 13-15

    In the article are presented the results of researches of action of electronic ray on optical elements. The analysis of surfaces of elements before and after a beam-processing the method of atomic-force microscopy shows that in first case the height of microburries makes 50…60 nm, and in second case goes down to the level of 0,5…1 nm. Influence of parameters of electronic ray is set on the height of microburries: the increase of closeness of thermal influence of ray in 6 times results in diminishing of height of microburries in 3…4 time, diminishing of rate of movement of ray in 5 times results in diminishing of height of microburries in 5…6 times. It is shown that by optimization of the modes of beam-processing of elements it is possible substantially to improve (to 50…60%) properties of its superficial layers and basic operating descriptions of devices. Thus probability of destruction of elements and death devices in the conditions of intensive external thermal influences, devices can undergo that at their storage, portage and application, diminishes in 1,5…2 time.

  • A NEW APPROACH TO AUTOMATED DESIGN OF A MINIMUM MASS CARDAN COUPLING

    pg(s) 16-19

    While designing a Cardan coupling it is necessary to assess the assembly-ability of its components as well as to ensure that they do not interfere with each other during normal operation. In practice, this is done by use of prebuilt sample models, where everything is checked by experimenting. The authors share herewith their idea for developing a new approach to designing Cardan couplings, where all operations are performed in an automated way as early as the design stage.

  • STUDIES AND RESEARCH ON THE DESIGN AND CONSTRUCTION OF A MACHINE FOR TENDERIZE MEAT WITH THE PNEUMATIC ACTION AND AUTOMATION MODULES

    pg(s) 20-24

    The mechanical tenderization , during meat processing, can be the advantageous solution for rapid maturation of the product. This method represents the possibility to modulate the working process on optimal variants of applying the impact force, the pressing time and the relaxation time of the product.

    In this paper there is presented an experimental model of machine of our own conception for the optimization of the tenderization process of the meat.

    The paper, presents the adequate system of pneumatic action and the automation elements of the working parameters which were made as our own conception for construction of a machine for meat tenderization. Within the elaborated pneumatic scheme of driving there are identified the elements that can be electrically driven and the basis established scheme includes the programmable controller of the process.

  • THE DEPENDENCE OF THE PHYSICAL AND MECHANICAL

    pg(s) 25-27

    The results of studies of the influence of the type of machining and tool material to the structural state of the surface layer and the fatigue strength of ХВСГsteel during machining are shown. Processing with the composite-10 tool in a surface layer for α – and γ – phases is accompanied only by compressing residual pressure while abrasive processing promotes occurrence of stretching pressure of an I-type. Increasing of cutting speed of the composite-10 tool from 50 to 200 m/min does not lead to significant changes in fatigue strength.

  • INTRODUCTION OF AN INNOVATIVE TECHNOLOGICAL PROCESS IN THE GEAR GRINDING WORKSHOP AT ZMM NOVA ZAGORA

    pg(s) 28-31

    The article studies the prerequisites for the introduction of process innovations at ZMM Nova Zagora JSC. The main principles of an original approach for decreasing the degree of discrete manufacturing by introducing an innovative technological process for mechanical machining of tooth gears are expounded. The results of its introduction in the gear grinding workshop are presented.

  • EMERGENCY BRAKING OF FAST RUNNING LOADING / UNLOADING HOISTS

    pg(s) 3-6

    Cranes integrated in the logistic chain are vital elements to ensure safety and economic efficiency of transport. So safety is an essential factor for service of cranes in nuclear plants or metallurgical plants. For service of ship-to-shore-cranes the economic efficiency is an additional dominating aspect. A main assembly of every crane is the hoist. Following is shown, which internal forces occur in the components of a hoist with safety brake and are to be considered while dimensioning. In addition a concept for the design and the control of the braking system is shown in order to reduce the internal forces in hoist components of the rotational part of the drivetrain as couplings and gearing.

  • DEVELOPMENT OF A CANTILEVER PLATE’S MODEL AS A COMPONENT OF THE METHOD OF LOCAL APPROXIMATIONS

    pg(s) 32-35

    The paper contains a numerical-analytical solution for deflections and force factors in a cantilever plate of infinite length due to a concentrated load, which is obtained using modern data about optimal quadrature integration. The aspect of optimality is the main feature that distinguished the present solution. The formulas provide high accuracy, which is examined through comparison of the results with the finite elements method and another numerical-analytical solution. The paper also contains formulas for deflections for different laws of load distribution and ideas for their application.

  • BASIC FINANCIAL CALCULATIONS USING INFORMATION SYSTEMS FOR SOLVING BUSINESS TASKS

    pg(s) 36-39

    A detailed study of the financial concepts fundamentals certainly is to give some idea on the concepts of finance. The investment world can be confusing for the investors. The investors need to go through some finance theories which will help them to understand the market behavior in a better way. There are a number of factors that influence the functioning of the investment market. The individual investor’s choice of investment may vary from one person to another. While some investors go for investing in the risky securities, some investors tend to play safe in the market by investing in the less risky environment.

    The finance theory concept including studying the various ways by which businesses and individuals raise money, as well as how money are allocated to projects while considering the associated with them risk factors.

  • METHOD OF INTENSITY ASSESSMENT OF POWER LINES SWINGING

    pg(s) 40-41

    On the basis of long-term statistics data of wires swinging accumulated by energy systems of Kazakhstan the swinging intensity linear regressional dependence has been elucidated as a function of wind speed and its direction to the power line, as well as the length of a span and the number of half-waves in the span. Lower and upper limits of regression equations parameters has been estimated.

  • APPLICATION OF CAD / CAM SYSTEM FOR FINDING INTERSECTION OF GEOMETRIC OBJECTS IN THE LEARNING PROCESS

    pg(s) 42-44

    This work is predstaveno decision of task of finding the intersection of geometric objects with the use of CAD / CAM systems in particular graphical programming environment Autocad .. The problem is solved by the method of auxiliary secant planes. Based on the studies and analyzes on resolving this type of geometric tasks is summarized methodology for finding the intersection between the two geometric objects. The process of the graphic finding the intersection by using the CAD / CAM system is illustrated step by step on the basis of the methodology.

  • THE PROCESSING OF ELECTROCHEMICAL COATINGS THROUGH SURFACE PLASTIC DEFORMATION (SPD)

    pg(s) 45-50

    Because of the surface oxide film’s presence, a negative electric potential and formation of the disadvantageous residual strains under the galvanic film’s putting on soft metals and alloys, there are the coming of considerable technological complications. This is obstructive to the good interaction between the films and main metal. In this case it is expedient the technological combination the galvanic film of the surface with surface plastic deformation. In this case, the surface plastic deformation is realized by the tools with radial feed of the deforming elements.

  • PREPARATION OF MULTI-COMPONENT POWDER OF ANY HIGH SOLIDS PROCESS

    pg(s) 7-9

    The possibility of obtaining ultra-disperse powders by high speed way with a particle size that does not exceed the declared value. The research of the mechanical method of obtaining ultra-disperse powders. Dispersion of obtained powder was defined for various materials. The dependence of the dispersion of the obtained powder was indentified from the choice of abrasive tools on Bakelite and metal bonds.