Machines. Technologies. Materials.
Vol. 9 (2015), Issue 1

Table of Contents

  • INFLUENCE OF NITROGEN ADDITION ON PHYSICAL-CHEMICAL PROPERTIES AND CORROSION RESISTANCE OF STAINLESS STEELS

    pg(s) 3-6

    Researched were the physico-chemical properties, hardening and corrosion resistance of Cr18Ni10N type austenitic chromium- nickel stainless steels of different purity by the impurities and with different nitrogen content: from impurity level to 0.220%. It is demonstrated that nitrogen alloying is beneficial both for hardening and improvement of corrosion resistance of steel under conditions when nitrogen has the form of solid solution. Addition of 0.186-0.220% of nitrogen doesn’t reduce intercrystalline corrosion in standard environment of 0.5M H2SO4 + 0.01M KSCN and improves resistance to general and pitting corrosion in chloride-containing environments.

    Pure nitric steel shows higher resistance to intercrystalline, general and pitting corrosion in chloride solutions than normal purity steel.

  • POLYMERIC COMPOSITES OF CONSTRUCTIONAL APPLICATION BASED ON THERMOSETTING MATRIX AND CHEMICAL FIBERS

    pg(s) 7-9

    The polymeric composites on the basis of a thermosetting matrix, chaotically reinforced chemical fibers with a broad band and high level of operating performances have been developed. The optimum geometrical parameters of a fibrous filler, degree of filling of a matrix at a different dispersibility of a filler ensuring high technological effectiveness and degree of strengthening have been defined. The thermodynamic conditions of obtaining strong adhesive connection of a matrix with a filler have been explored during receiving polymeric composites.

  • LASER MATERIALS PROCESSING SYSTEM.

    pg(s) 13-15

    In this paper are given results of investigations of characteristics of radiation of the compact fiber laser. It is established that at work in pulse and in pulse periodic modes the fiber laser generates enough stably radiation with length of a wave 1,083 microns with peak power to 1,5 ÷ 2 kW. The area of stable generation of radiation is limited to a pumping current 8A. There are shown possibilities of treatment of materials by radiation of the investigated laser.

  • ADJUSTING THE SALES PROCESS TO THE PERSONALITY OF THE BUYER (RESEARCH THE AUSTRIAN INVESTMENT GOODS INDUSTRY)

    pg(s) 16-21

    The sales process in the investment goods industry is sophisticated and long-lasting when compared to commodity products.
    Sometimes it takes years to close the business. Therefore it is of enormous importance for both parties – the buyer and the seller – that this process is as efficient as possible. Commitment, trust and cooperation are key elements in developing enduring and successful relationships between sellers and buyers in a b2b setting. Commitment and trust can only be developed when individuals understand each other and the expectations of each other (pervin, cervone and john 2000, p.526). Understanding does not just mean that it is based on business information, e.g. Technical specifications; it is extremely important to understand the buyer as a whole person – the personality of the person. People are different and people behave differently; therefore based on an individual’s personality, he or she will have different expectations and also expect different things depending on how he or she is treated.
    The motivation to explore this topic is derived from the tremendous influence that the buyer’s personality can have on the sales process and outcome. Adapting to personal needs, preferences, thinking and decision-making styles shows the buyer that the seller understands him or her, which consequently establishes a strong relationship.

  • SUPERFINISHING FLAT AND CYLINDRICAL SURFACES OF GEAR PUMP PINIONS

    pg(s) 22-24

    The quality of the flat and cylindrical surfaces of the gear pump pinions is a restrictive condition for a suitable work. The required quality of these surfaces is very high, R = 0,04 – 0,08 µm. As well, there are restrictive conditions input for the form and positioning a deviations. So far, the manufacturing of these surfaces used to be achieved by grinding and no one could guarantee that the surface roughness was in accordance with the technical documentation. The presented constructive solution allows obtaining a good quality of the flat and cylindrical surfaces. It uses a superfinishing attachment that can be mounted on the engine lathe.

  • EXPERT SYSTEMS USED THROUGHOUT THE TRAINING OF MASTER ENGINEERS IN THE FIELD OF INDUSTRIAL ENGINEERING

    pg(s) 25-28

    The article offers an approach for training of students from qualification degree ‘Master’ in the specialty of ‘Industrial engineering’. It represents analyses of suitable expert systems which are used throughout the process of computer-based designing and diagnostics of mechanical products. We have created a scheme of an expert system for gear transmission designing as well as algorithms based on rules of production for the purpose of investigation of stress concentrators and change of the geometry of segments from a gear or a shaft. We have also rationalized the usage of appropriate methods for engineering analysis and the usage of software products for simulation modeling and investigation of designed objects’ behavior through the use of a Frequency Analysis. The latter also includes searching for collisions that take place during the generation of the designed objects’ assembled unit. The results are useful for the purpose of acquisition of skills and knowledge in the field of expert systems application; they would help in the process of searching for creative solutions within the stages of computer-based designing of technical objects, and in the process of diagnostics of their exploitation.

  • CORROSION PROPERTIES OF Ti-6Al-4V ALLOY WITH NITRIDE AND OXYNITRIDE COATINGS IN PHYSIOLOGICAL SOLUTIONS

    pg(s) 29-31

    In this work, the corrosion resistance of Ti-6Al-4V alloy with nitride and oxynitride coatings was investigated in isotonic 0.9% NaCl solution and Ringer’s solution at temperatures of 36оС and 40оС, which simulates the transition from normal to inflammatory condition of the human body. It was determined that the change of temperature of both physiological solutions does not decrease the protective function of nitride coating on Ti-6Al-4V alloy. It was shown that the corrosion properties of oxynitride coating are deteriorated by increasing the temperature up to 40oС, especially in 0.9% NaCl solution.

  • PLASMA TECHNOLOGIES FOR OBTAINMENT OF COMPOSITE MATERIALS DISPERSION HARDENED BY NANOSTRUCTURED PARTICLES

    pg(s) 32-35

    Prospects for creation of plasma electric discharge technology for production of dispersion-hardened by nanoparticles composite materials are considered. Physical modelling of plasma formations distribution in discharge camera is performed. The regularities of the electric discharge processing parameters influence on dispersity, phase composition and electrical resistivity of obtained powders are studied. The regime for spark plasma sintering of processes powders is theoretically and experimentally justified.

  • ANALYSIS OF STRESS-STRAIN STATE OF ECCENTRIC ONE-WAY CLUTCHES BY THE FINITE ELEMENT METHOD

    pg(s) 36-38

    Outer shell is important structural element of one-way clutch and its stress-strain state was not researched enough before.
    Stresses and strains distribution in the eccentric one-way clutch outer shell is researched using computer simulation and finite-elements method calculation. Effect areas and change character of stresses and strains in the non-friction eccentric one-way clutch outer shell are determined.

  • STRUCTURE AND CHARACTERISTICS COATINGS OBTAINED AFTER COMPLEX SATURATION BORON AND SILICON ON CARBON STEEL

    pg(s) 39-41

    The results of research coatings coatings obtained after complex saturation boron and silicon in the powder environment on steel 45. Determine the thickness and microhardness of the resulting coatings, their phase and chemical composition. It has been established that the coatings obtained after complex saturation boron and silicon more plastic and have a 1.8 times higher fracture toughness (K1c) and 1.5 times higher than the wear resistance as compared with coatings obtained by borating.

  • EFFECT OF STEP THERMOMECHANICAL TREATMENT ON ELECTRICAL PROPERTIES OF AL 6101

    pg(s) 42-43

    This work is focused on investigation of different thermomechanical treatment (TMT) regimes influencing mechanical and electrical properties of Al-Mg-Si alloy. Three TMT regimes were chosen, which differ in the number of treatment steps. Grain size, microhardness, electrical conductivity were measured. It was revealed that dividing TMT into 2 stages favorably affects formation of mechanical and electrical properties in Al6101.

  • EXPERIMENTAL RESEARCH STUDY ON THE USE OF A RESISTIVE TENSOMETRIC SENSOR

    pg(s) 44-47

    The paper presents a method using the electric tensometry. The electric tensometry is a method for measuring the deformations by using some transducers. These transducers turn the variation of a mechanical size into variations of an electric size. The principle of functioning of the resistance tensometric transducer is the modification of the electric resistance depending on the variation of the specific deformation.

  • DUAL FLOW HYDROMECHANICAL PLANETARY GEAR WITH

    pg(s) 48-51

    The automatical variability option of changing the angular velocity is a perspective tendency for coordination of the characteristics of the engine with the working machine. That gives the ability to enhance the productivity of the machine, to simplify their controls and to increase their efficiency factor. All of that led to the creation of many methods and ways of lightly regulation of angular velocity and to a wide variety of constructions and many more. The main disadvantage of the mentioned mechanisms, and other similar mechanisms also, having the continuously variable gear ratio option is that the pump as an element of all of them appears to be only a consumer of power in all duty. The consumed power by the pump turns into heat and heats the oil which makes it necessary for it to be in greater amounts. This lowers the efficiency factor and field of application of mentioned mechanisms and more. For removing this disadvantage a solution is proposed with the realization of a hydromechanical gear with hydrovolume regulating contour.