Industrial safety in the foundry production is determined by the imperfection of the technological regimes and the cleanliness of the working area in various foundry sections. The state of the working area in the foundry shops is largely determined by the number of sources of harmful substances emission from production equipment and the state of air purification facilities. Contaminants enter the human body mainly through the respiratory system. In this article, based on the information, X-ray phase analysis data on the elemental composition of dust are presented, the experimental data are visualized. The authors in the process of research with application of X-ray phase analysis used «DRON 04» X-ray diffractometer, «Radian DR-02»X-ray diffractometer, «Bruker S8 Tiger» wavelength dispersive X-ray fluorescence spectrometer. Information on the dispersion and elemental composition is presented. X-ray phase analysis showed a more accurate percentage of the elements in the sample. The results of the analysis show that dispersed dust less than 10 microns is present in foundries, while 78% of iron (Fe) is present in the shot blasting area.
The article presents the results of the study on obtaining high-quality bronze castings used in the mechanisms of agricultural machinery. A sprue cup has been designed to ensure the streamline mode of cavity filling, which results in slag shot flotation in the upper (ingot top) part of the chill mould.
The article presents the results of studies concerning the process of friction of elastomeric material (rubber) with steel surfaces with different finishes when using ferrofluids as a lubricant for a magnetic field. Method of mathematical planning for experiments was used to reduce the number of tests in the process of conducting experiments. The use of methods for optimal experiment planning made it possible to minimize the number of measurements to build adequate models and to achieve a significant reduction in time and material costs in order to study the friction of an elastomeric material with metal. In the course of the research, the influence of such factors as the magnitude of magnetic induction in the working gap, sliding speed of the counter elements, and contact force, on the friction process in integrated ferrofluid seals with an elastomeric working element was determined.
The article provides definitions of the reference axis and plane for forming in automatic forming and punching lines. Specific recommendations are given on the choice of the position of the reference axis and forming plane depending on the configuration of the manufactured parts of roll-formed sections.
The article analyzes the shortcomings of stepper motors and the vibrations that arise during their operation. The most effective measure to reduce resonance is the use of microstep mode, reducing the vibration of the stepper motor and increasing the smoothness of the transmission. Microstep mode helps to achieve such results. More short-time acceleration-deceleration forces influence the motor shaft, and the shaft performs steps of smaller amplitude. Inertial phenomena appear weaker as a result [1, 2].
A model of a digital device for shearography (speckle pattern shearing interferometry) is presented. It will allow increasing the speed of non-destructive testing in real time (with the frequency of video registration). The device allows exploring large areas with the preservation of the same spatial resolution for a single pass. The use of specialized lenses (universal design allows the use of a wide range of lenses) in the device will also solve research problems that require high accuracy and resolution. The advantage of the developed device is the possibility of flexible adaptation of the optical scheme and software to the needs of a particular customer, which is impossible with the purchase of a ready-made complex from foreign manufacturers.
The study, which is given in the article, is devoted to the selection of an electric motor for drive in hydraulic press with a nominal power of 5MN. The article presents the main characteristics, description of the press operation using the means of mechanization of the pressure treatment process. When using the Deform-3D software, the process of stamping the ZIL 130 cardan shafts was simulated. On the basis of the presented hydraulic scheme of the press, its topological model was formed with the PA-9 software package. The deformation force obtained in the course of the simulation results of the punching process was used in the topological model of the press. The operating sequence of the end switches and hydraulic distributors during the process of punching is presented with the help of a cycle scheme in a form of a table.
Powder and mesh porous materials obtained by sintering are described with a consideration of their main characteristics. Significant positive aspects of the use of various porous structures in various designs of heat exchangers with porous filler are indicated. It also indicates obvious difficulties in organizing the flow of coolant through the porous structure. A brief analysis of all sorts of diverse changes in the physical, structural and geometric characteristics of porous materials and designs of heat exchangers is given. The article may be useful for postgraduate students for choosing the direction of thesis research and writing review chapters.
The article shows the relevance of equipping university laboratories with modern measuring instruments. The standard for equipping technical universities with the entire arsenal of measuring instruments, vibrometers, portable instruments, analyzers, multichannel units, sets of sensors for measurement, common software, display stands, a set of methodological and laboratory materials is becoming necessary in modern conditions of a rapidly evolving technogenic situation. The emergence of such complexes allows the use of diverse, but unified in its methodological basis, approaches that allow more active use of new capabilities of measurement technologies.
