Vol 8, No 1-2 (2014)

The article is devoted to the 75 anniversary of the department “Technology of constructional materials” of UMech. Stages of foundation, formation and current indicators of work of the department are presented in the article.

In the article the problem of choice of rational part blanks at early stages of the design of technological processes is considered by the author. The reasoning of the objective criteria for selection of a rational blank from several alternative variants is given. The technique allowing to perform a selection of rational blank with high accuracy is developed. The conclusion according to the results of research is made.

The article proposes a method of magnetic separation to remove impurities, susceptible to magnetically deposition, from fluids.

The article suggests a method of express-diagnostics of the roughness of the surface layer of machine parts and shows its efficiency. The authors developed a graphical probabilistic model, providing high quality of diagnosis with small number of statistical data. Express diagnostics performs determination of the quality of surface layer on basis of profilogram classification. The diagnostic process is running as the comparison of profilograms with prepared models of different classes of roughness using statistical sampling. Program realization of the model is developed, specialists were trained and experimentally investigated the accuracy of the diagnostics.

The article presents the results of laboratory tests of dispersed-filled composites. Tests on friction and wear were performed using “disk - pad” and “rotating bushing on disk” schemes. There is high compatibility of materials in friction pairs of composite material and steel and their advantages over a pair of bronze and steel in terms of wear and maximum working load, and also stability of the coefficient of friction in operation mode, and also stability of the latter as the load increases. It is shown that the increase in size and volume content of particles in the matrix reduces wear of parts of composite material, however, this increases the wear paired counterface and friction coefficient.

The article considers the reinforcing elements from matrices of aluminum alloys. It presents data on the production technology of gradient-reinforced products. The technology of reinforcement and properties of castings with given content of ceramic filler is considered.

The article considers the issues of forming of box-shaped parts with a hole in the bottom by flanging drawing, having character and high potential of use in industrial enterprises.

The article shows the results of research of tempering time influence on went castings made of silumin casting with crystallization under pressure, their structure and mechanical properties.

The paper considers approaches to modeling of technological processes and devices for cutting-deforming machining of non-rigid shafts with additional contours of links.

In this paper the analysis of the modern physical and chemical methods of glass processing by concentrated streams of energy is performed. Hydroabrasive and diamond ultrasonic treatment are considered. The schemes of hydroabrasive and diamond ultrasonic processing are shown. The comparison of hydroabrasive treatment with other methods of glass treatment is carried out.

The article considers the principles of selection of cutting technological mediums for metal cutting. Rational use of effective cutting fluid is an important factor in improving of productivity and quality of metal working. Effect of cutting fluid depends on the rational choice of the specific conditions of the cutting, the predominant type of tool wear and tool and base material. In PJSC RPA “CNIITMASH” a complex of works on testing of a wide range of cutting fluids was carried out and recommendations for their use were developed

The article considers the problem of ensuring the quality of fuel injectors for gas-turbine engines at assembly time. The way of increasing the effectiveness of the implementation of the assembly process is discussed.

The article proposes a design of combined instruments with changeable polyhedral plates for processing of stepped bores. The new design of a stepped drill enables the installation of cutting plates to any angle is suggested.

The article describes the possibilities of improving the technology of manufacture of modified globoidal gears with localized contact patch. A technology of modified globoid gear, localization of a contact patch, and design of the cutting tool for cutting of globoidal worms and gears are developed.

In PJSC RPA “CNIITMASH” the authors together with JSC “ZiO - Podolsk” conducted a series of research work on the influence of technology of hole processing in reservoirs of steam generators and chambers of modules on the status of a surface layer and operational properties of products. Recommendations on processing of deep holes and fixing of tubes in the heat-exchange equipment for nuclear power units are developed.

The author proposes a problem of the influence of a type of multiproduct machinery production on the performance of technological and production processes. The analysis of the structure of the formula on determination of duration of the working cycle allowing to take into account technological and organizational characteristics, type of production is carried out.

The paper substantiates the necessity of application of artificial intelligence methods in technological design. The methods of synthesis of technological part’s model are considered. The information needed for subsequent technological design is defined. The methods of automated building process for technological part’s model based on a drawing and three-dimensional model are chosen.

The article considers the main aspects of the application of statistical methods for strategic management processes in modern industry, as well as the stages of the introduction of such systems on the basis of modern measuring tools and software.

The article considers modern worm milling cutters features - design characteristics, used materials and wear-resistant coatings. The influence of different structural parameters on the performance and durability of cutters was valued.

The article describes the factors, which influence the accuracy of toothed gear. It is shown that significant influence on accuracy have the following factors: accuracy of manufacturing and assembling of all the transmission elements. The example of the calculation of the technological dimensional chains for cylindrical toothed gears is given.

The article considers the relevance of the dynamometers use by machine-building enterprises and educational institutions for the determination of the cutting forces during machining. There are mentioned technical and operational requirements of the modern measurement dynamometer systems. The characteristics of the dynamometer Dyna-Z for measuring the tangential component of the cutting force during turning were shown. There is also mentioned the experimental data for definition the increase of cutting force Pz, caused by the deterioration of the tool during long operations.

The problems arising when machining workpieces made of tough materials are considered in article. There is proposed to use the parameters of surface roughness, which have a significant impact on the operational properties of machines parts for the evaluation of the quality of the surface layer. The methods of calculation of these parameters when machining are shown. There are presented the methods of selecting the optimal cutting modes in turning, allowing to reduce the cost of processing and to ensure the required parameters of surface quality.

The article presents the results of the influence of temperature and deformation during snap temper of structural steel 38ХН3МФА. It is shown that 300°С and 500°С deformation temperatures of 300 and 500° significantly increases the durability characteristics, but decreases the flexibility. The subsequent after deformation snap temper at a temperature 560°С has a positive effect on the mechanical properties complex.

The article shows the results of studying the interrelation of intensity of mating machine parts wear rate with the quality parameters of the surface layer provided by selection of the appropriate technological conditions when machining

The article describes the concept, objectives and tasks of integrated logistics support services for aviation gas turbine engines and gas-pumping installations. Analysis of different approaches to the creation of the system of after-sales service of the CCD was made. The results of the analysis of economic efficiency of after-sales service after the product production are shown.

There was developed a technology to enhance the resilience of large dies and punches. Maximum contact load on the exhaust side of the punch die was measured. The experimental research of non-abrasive finishing antifriction coatings wear resistance was carried out taking into account the influence of lubricants.

The article proposes the technology to increase the tool life by applying ecological technological environment. The results of studies show the effect of green technological environment on wear resistance of the cutting tool.