Pub Date : 2021-12-07DOI: 10.15588/1607-6885-2021-3-8
S. Dyadya, О. Kozlova, Yevhen Kushnir
Purpose. Investigate the mechanism of forming the profile of the machined surface when milling with a tool with a long overhang. Methodology. Experimental method was used with a special stand, which makes it possible to simulate an elastic system of a part with different dynamic properties, record oscillograms of oscillations of a part and a tool during the cutting process. Milling was performed with a milling cutter with cutting modes in which self-oscillations occur. To determine the patterns of movement of the part and the tool, the method of aligning the fragments of oscillograms was used. Results. The scheme of the formation of the profile of the machined surface under the conditions of milling with self-oscillations by a tool with a long overhang has been investigated. It was found that the free vibrations of the tool after the tooth leaves the cutting zone have a higher intensity than that of the part. This affects the position of the infeed point on the cutting surface. To determine the period and range of self-oscillations of the cutter and the part, the section of the oscillogram with self-oscillations was straightened using the Savitsky-Galei filter. Comparison with the cutting surface of the sections of the oscillogram of the part and the tool during milling showed an identical vibration mode of the cutter. Based on the results of experimental studies, the deviation from the line of elastic equilibrium of the first wave of self-oscillation of the cutter was determined and a graph of its change was plotted. The studies performed have confirmed the previously established effect of deviation from the elastic equilibrium position of the first self-oscillation wave during counter milling on the shaping of the treated surface. Originality. It has been established that the profile of the machined surface when milling with long overhang end mills is directly related to the deviation of the tool from the elastic equilibrium position during self-oscillation. Practical value. The obtained results show the effect of a tool with a long overhang on the formation of a machined surface during milling with self-oscillation.
{"title":"Investigation of the formation of a machined surface profile during end milling with a tool with a long overhang","authors":"S. Dyadya, О. Kozlova, Yevhen Kushnir","doi":"10.15588/1607-6885-2021-3-8","DOIUrl":"https://doi.org/10.15588/1607-6885-2021-3-8","url":null,"abstract":"Purpose. Investigate the mechanism of forming the profile of the machined surface when milling with a tool with a long overhang. \u0000Methodology. Experimental method was used with a special stand, which makes it possible to simulate an elastic system of a part with different dynamic properties, record oscillograms of oscillations of a part and a tool during the cutting process. Milling was performed with a milling cutter with cutting modes in which self-oscillations occur. To determine the patterns of movement of the part and the tool, the method of aligning the fragments of oscillograms was used. \u0000Results. The scheme of the formation of the profile of the machined surface under the conditions of milling with self-oscillations by a tool with a long overhang has been investigated. It was found that the free vibrations of the tool after the tooth leaves the cutting zone have a higher intensity than that of the part. This affects the position of the infeed point on the cutting surface. To determine the period and range of self-oscillations of the cutter and the part, the section of the oscillogram with self-oscillations was straightened using the Savitsky-Galei filter. Comparison with the cutting surface of the sections of the oscillogram of the part and the tool during milling showed an identical vibration mode of the cutter. Based on the results of experimental studies, the deviation from the line of elastic equilibrium of the first wave of self-oscillation of the cutter was determined and a graph of its change was plotted. The studies performed have confirmed the previously established effect of deviation from the elastic equilibrium position of the first self-oscillation wave during counter milling on the shaping of the treated surface. \u0000Originality. It has been established that the profile of the machined surface when milling with long overhang end mills is directly related to the deviation of the tool from the elastic equilibrium position during self-oscillation. \u0000Practical value. The obtained results show the effect of a tool with a long overhang on the formation of a machined surface during milling with self-oscillation.","PeriodicalId":423067,"journal":{"name":"Innovative Materials and Technologies in Metallurgy and Mechanical Engineering","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133535226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-07DOI: 10.15588/1607-6885-2021-3-14
V. Olshanetskii, О. Glotka
Dependence of properties of multicomponent nickel alloys on atomic-phase state
多组分镍合金性能与原子相态的关系
{"title":"Dependence of properties of multicomponent nickel alloys on atomic-phase state","authors":"V. Olshanetskii, О. Glotka","doi":"10.15588/1607-6885-2021-3-14","DOIUrl":"https://doi.org/10.15588/1607-6885-2021-3-14","url":null,"abstract":"Dependence of properties of multicomponent nickel alloys on atomic-phase state","PeriodicalId":423067,"journal":{"name":"Innovative Materials and Technologies in Metallurgy and Mechanical Engineering","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114329954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-07DOI: 10.15588/1607-6885-2021-3-5
О. Kachan, S. Ulanov
Purpose of work. Improving the quality of manufacturing of blanks of compressor blades from titanium alloys by precision stamping. Research methods and equipment. The research was carried out by precise stamping of blade blanks from the VT8 titanium alloy of the compressor of the D-436 aircraft engine at various temperatures of deformation. Precise stamping of parts was carried out in one tool stroke from a preliminary blank obtained by extrusion from a rod with a diameter of 30 mm. The research of the surface of the workpiece was carried out after processing by X-ray spectral analysis on a JSM6360LA scanning electron microscope. Microhardness was measured on a PMT-3 device at a load of 50 g. Investigations by precision stamping were also carried out on blades made of the OTCh-1 alloy of the input guide vane of the HPC of the D-136 helicopter engine and on the rotor blades of the compressor of the D-36 aircraft engine made of VT3-1 titanium alloy. The obtained results. It is shown that the conditions of deformation of a titanium alloy blade blank by precise stamping have a significant effect on the quality of its surface (macrostructure and microstructure). The deformation temperature of the metal affects the macrostructure and microstructure of the surface during precision stamping of blades from titanium alloys. Scientific novelty. It has been established that during precise stamping of blade blanks from titanium alloys, the deformation temperature has a significant effect on the quality of their surface. The values of the deformation temperature are determined, which provide a significant level of quality of the surface of the airfoil of the blades with precise stamping. Practical value. The results obtained made it possible to develop multi-pass stamping of blade blanks from titanium alloys, when fractional deformation in one pass is applied, not exceeding 30%. The heating temperature of the intermediate billet for deformation should be as close as possible to Тm within ± 10 °С.
{"title":"The influence of deformation conditions of titanium alloys on the surface quality of the feather of compressor blades","authors":"О. Kachan, S. Ulanov","doi":"10.15588/1607-6885-2021-3-5","DOIUrl":"https://doi.org/10.15588/1607-6885-2021-3-5","url":null,"abstract":"Purpose of work. Improving the quality of manufacturing of blanks of compressor blades from titanium alloys by precision stamping. \u0000Research methods and equipment. The research was carried out by precise stamping of blade blanks from the VT8 titanium alloy of the compressor of the D-436 aircraft engine at various temperatures of deformation. \u0000Precise stamping of parts was carried out in one tool stroke from a preliminary blank obtained by extrusion from a rod with a diameter of 30 mm. \u0000The research of the surface of the workpiece was carried out after processing by X-ray spectral analysis on a JSM6360LA scanning electron microscope. \u0000Microhardness was measured on a PMT-3 device at a load of 50 g. \u0000Investigations by precision stamping were also carried out on blades made of the OTCh-1 alloy of the input guide vane of the HPC of the D-136 helicopter engine and on the rotor blades of the compressor of the D-36 aircraft engine made of VT3-1 titanium alloy. \u0000The obtained results. It is shown that the conditions of deformation of a titanium alloy blade blank by precise stamping have a significant effect on the quality of its surface (macrostructure and microstructure). The deformation temperature of the metal affects the macrostructure and microstructure of the surface during precision stamping of blades from titanium alloys. \u0000Scientific novelty. It has been established that during precise stamping of blade blanks from titanium alloys, the deformation temperature has a significant effect on the quality of their surface. The values of the deformation temperature are determined, which provide a significant level of quality of the surface of the airfoil of the blades with precise stamping. \u0000Practical value. The results obtained made it possible to develop multi-pass stamping of blade blanks from titanium alloys, when fractional deformation in one pass is applied, not exceeding 30%. \u0000The heating temperature of the intermediate billet for deformation should be as close as possible to Тm within ± 10 °С.","PeriodicalId":423067,"journal":{"name":"Innovative Materials and Technologies in Metallurgy and Mechanical Engineering","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127893004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-07DOI: 10.15588/1607-6885-2021-3-11
V. Mazur, S. Pinchuk
On the prospects for the founding of the phenomenological theory of crystal growth during electrocrystallization
电结晶过程中晶体生长的现象学理论建立的展望
{"title":"On the prospects for the founding of the phenomenological theory of crystal growth during electrocrystallization","authors":"V. Mazur, S. Pinchuk","doi":"10.15588/1607-6885-2021-3-11","DOIUrl":"https://doi.org/10.15588/1607-6885-2021-3-11","url":null,"abstract":"On the prospects for the founding of the phenomenological theory of crystal growth during electrocrystallization","PeriodicalId":423067,"journal":{"name":"Innovative Materials and Technologies in Metallurgy and Mechanical Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134436201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-07DOI: 10.15588/1607-6885-2021-3-9
V. Dubrovin, M. Mogilnaya, Yu. V. Tverdokhleb
Purpose. Analyze the effectiveness of using wavelet analysis to assess the quality of metal surfaces. Develop information technology information technology to automate the process of assessing the quality of metal surfaces by wavelet analysis. Methodology. The main parameters for assessing the processing of metal surfaces are considered. A multilevel decomposition of the profile using wavelets was performed. Findings. The developed software allows to calculate parameters of an assesment of processing of metal surfaces that will help to minimize number of routine operations and difficult mathematical calculations, and also gives illustrative graphs of waviness and roughness. The advantage of this software product is that it is focused and developed specifically for the analysis of signals-profilograms of metal surfaces and is free. In further development, this software product can be used in the mechanical engineering industry (milling) and will help reduce the cost of software. Originality. The method of optimal decomposition of a complex signal is considered, using the criterion of minimizing the total entropy of wavelet coefficients of both its components in determining the optimal level of decomposition, reconstruction of the signal by approximating wavelet coefficients of the optimal signal. Convenient software has been developed. Practical value. The developed information technology of the software product for estimating the parameters of non-stationary signals can be used in the analysis and diagnosis of objects of different nature, in the mechanical engineering (milling) industry, in particular obtaining of waviness and roughness profiles.
{"title":"Information technology for quality assesment of the processing of metal surfaces by the method of wavelet analysis","authors":"V. Dubrovin, M. Mogilnaya, Yu. V. Tverdokhleb","doi":"10.15588/1607-6885-2021-3-9","DOIUrl":"https://doi.org/10.15588/1607-6885-2021-3-9","url":null,"abstract":"Purpose. Analyze the effectiveness of using wavelet analysis to assess the quality of metal surfaces. Develop information technology information technology to automate the process of assessing the quality of metal surfaces by wavelet analysis. \u0000Methodology. The main parameters for assessing the processing of metal surfaces are considered. A multilevel decomposition of the profile using wavelets was performed. \u0000Findings. The developed software allows to calculate parameters of an assesment of processing of metal surfaces that will help to minimize number of routine operations and difficult mathematical calculations, and also gives illustrative graphs of waviness and roughness. \u0000The advantage of this software product is that it is focused and developed specifically for the analysis of signals-profilograms of metal surfaces and is free. \u0000In further development, this software product can be used in the mechanical engineering industry (milling) and will help reduce the cost of software. \u0000Originality. The method of optimal decomposition of a complex signal is considered, using the criterion of minimizing the total entropy of wavelet coefficients of both its components in determining the optimal level of decomposition, reconstruction of the signal by approximating wavelet coefficients of the optimal signal. Convenient software has been developed. \u0000Practical value. The developed information technology of the software product for estimating the parameters of non-stationary signals can be used in the analysis and diagnosis of objects of different nature, in the mechanical engineering (milling) industry, in particular obtaining of waviness and roughness profiles. \u0000 ","PeriodicalId":423067,"journal":{"name":"Innovative Materials and Technologies in Metallurgy and Mechanical Engineering","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129037356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-14DOI: 10.15588/1607-6885-2021-2-1
V. Mazur, Yu. I. Bogomol, N. Upatov
Purpose. To investigate the laws of crystallization and formation of 3D morphology of ternary eutectics in system B4C-NbB2-SiC. Research methods. SEM (SE, BSE), РСМА (EDS, WDS), XRD. Results. The micro- and macro-morphology of eutectic colonies in alloys of the system NbB2-SiC-В4С formed during directional crystallization have been investigated. The obtained patterns are embodied in a 3D structural model of (B4C+NbB2+SiC) eutectic cell and from these result, a microscopic kinetics of crystallization of this cell was proposed. The continuity of eutectic phase dendrites from nucleation to the end of growth and inadequacy of ideas about eutectic as a mechanical mixture of small crystals of eutectic phases were shown. Scientific novelty. For the first time a 3D model of a three-phase 4-component eutectic cell of eutectic colony was built. For the first time the possibility of combined microscopic crystallization kinetics of a three-phase eutectics was revealed, including both paired cooperative microscopic kinetics of (SіC+ NbB2) growth and the kinetics of autonomous growth of the third eutectic phase B4C. Practical value. Revealing the pattern of micro and macrostructure formation of a three-phase eutectics, which was formed in the course of directional crystallization, opens up technological prospects for purposeful control of the structure and properties of eutectic alloy due to the change of micro and macro morphological constituents, including the method of modification.
目的。研究B4C-NbB2-SiC体系中三元共晶的结晶规律及三维形貌的形成。研究方法。Sem (se, bse)， РСМА (eds, wds)， xrd。结果。研究了NbB2-SiC-В4С体系合金定向结晶过程中共晶菌落的微观和宏观形貌。得到的模式体现在(B4C+NbB2+SiC)共晶细胞的三维结构模型中，并根据这些结果提出了该细胞结晶的微观动力学。指出了共晶枝晶从成核到生长结束的连续性，以及将共晶视为共晶小晶的机械混合物的观点的不充分。科学的新奇。首次建立了共晶集落三相四组分共晶胞体的三维模型。首次揭示了三相共晶组合微观结晶动力学的可能性，包括(s c + NbB2)生长的配对协同微观动力学和第三共晶相B4C的自主生长动力学。实用价值。揭示在定向结晶过程中形成的三相共晶的微观和宏观组织形成规律，为通过改变微观和宏观形态成分(包括改性方法)有目的地控制共晶合金的组织和性能开辟了技术前景。
{"title":"Unidirectional crystallization and 3D structure of ternary four-component eutectic of B4C-NbB2-SiC system","authors":"V. Mazur, Yu. I. Bogomol, N. Upatov","doi":"10.15588/1607-6885-2021-2-1","DOIUrl":"https://doi.org/10.15588/1607-6885-2021-2-1","url":null,"abstract":"Purpose. To investigate the laws of crystallization and formation of 3D morphology of ternary eutectics in system B4C-NbB2-SiC. \u0000Research methods. SEM (SE, BSE), РСМА (EDS, WDS), XRD. \u0000Results. The micro- and macro-morphology of eutectic colonies in alloys of the system NbB2-SiC-В4С formed during directional crystallization have been investigated. The obtained patterns are embodied in a 3D structural model of (B4C+NbB2+SiC) eutectic cell and from these result, a microscopic kinetics of crystallization of this cell was proposed. The continuity of eutectic phase dendrites from nucleation to the end of growth and inadequacy of ideas about eutectic as a mechanical mixture of small crystals of eutectic phases were shown. \u0000Scientific novelty. For the first time a 3D model of a three-phase 4-component eutectic cell of eutectic colony was built. For the first time the possibility of combined microscopic crystallization kinetics of a three-phase eutectics was revealed, including both paired cooperative microscopic kinetics of (SіC+ NbB2) growth and the kinetics of autonomous growth of the third eutectic phase B4C. \u0000Practical value. Revealing the pattern of micro and macrostructure formation of a three-phase eutectics, which was formed in the course of directional crystallization, opens up technological prospects for purposeful control of the structure and properties of eutectic alloy due to the change of micro and macro morphological constituents, including the method of modification.","PeriodicalId":423067,"journal":{"name":"Innovative Materials and Technologies in Metallurgy and Mechanical Engineering","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124052096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-14DOI: 10.15588/1607-6885-2021-2-3
O. Glotka, V. Olshanetskii
Purpose. The aim of the work is to obtain predictive regression models, with the help of which, it is possible to adequately calculate the mechanical properties of nickel-based superalloys of equiaxial crystallization, without carrying out preliminary experiments. Research methods. To find regularities and calculate the latest CALPHAD method was chosen, and modeling of thermodynamic processes of phase crystallization was performed. Results. As a result of experimental data processing, the ratio of alloying elements Kg¢ was proposed for the first time, which can be used to assess the mechanical properties, taking into account the complex effect of the main alloy components. The regularities of the influence of the composition on the properties of heat-resistant nickel alloys of equiaxial crystallization are established. The analysis of the received dependences in comparison with practical results is carried out. The relations well correlated with heat resistance, mismatch and strength of alloys are obtained. Scientific novelty. It is shown that for multicomponent nickel systems it is possible with a high probability to predict a mismatch, which significantly affects the strength characteristics of alloys of this class. The regularities of the influence of the chemical composition on the structure and properties of alloys are established. A promising and effective direction in solving the problem of predicting the main characteristics of heat-resistant materials based on nickel is shown Practical value. On the basis of an integrated approach for multicomponent heat-resistant nickel-based alloys, new regression models have been obtained that make it possible to adequately predict the properties of the chemical composition of the alloy, which made it possible to solve the problem of computational prediction of properties from the chemical composition of the alloy. This allows not only to design new nickel-based alloys, but also to optimize the composition of existing brands.
{"title":"Properties of nickel-based superalloys of equiaxial crystallization","authors":"O. Glotka, V. Olshanetskii","doi":"10.15588/1607-6885-2021-2-3","DOIUrl":"https://doi.org/10.15588/1607-6885-2021-2-3","url":null,"abstract":"Purpose. The aim of the work is to obtain predictive regression models, with the help of which, it is possible to adequately calculate the mechanical properties of nickel-based superalloys of equiaxial crystallization, without carrying out preliminary experiments. \u0000Research methods. To find regularities and calculate the latest CALPHAD method was chosen, and modeling of thermodynamic processes of phase crystallization was performed. \u0000Results. As a result of experimental data processing, the ratio of alloying elements Kg¢ was proposed for the first time, which can be used to assess the mechanical properties, taking into account the complex effect of the main alloy components. The regularities of the influence of the composition on the properties of heat-resistant nickel alloys of equiaxial crystallization are established. The analysis of the received dependences in comparison with practical results is carried out. The relations well correlated with heat resistance, mismatch and strength of alloys are obtained. \u0000Scientific novelty. It is shown that for multicomponent nickel systems it is possible with a high probability to predict a mismatch, which significantly affects the strength characteristics of alloys of this class. The regularities of the influence of the chemical composition on the structure and properties of alloys are established. A promising and effective direction in solving the problem of predicting the main characteristics of heat-resistant materials based on nickel is shown \u0000Practical value. On the basis of an integrated approach for multicomponent heat-resistant nickel-based alloys, new regression models have been obtained that make it possible to adequately predict the properties of the chemical composition of the alloy, which made it possible to solve the problem of computational prediction of properties from the chemical composition of the alloy. This allows not only to design new nickel-based alloys, but also to optimize the composition of existing brands.","PeriodicalId":423067,"journal":{"name":"Innovative Materials and Technologies in Metallurgy and Mechanical Engineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128174743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-14DOI: 10.15588/1607-6885-2021-2-2
V. Shalomeev, О. Lukianenko
Purpose. Study of the effect of alloying with aluminum on structure formation, mechanical properties and heat resistance of magnesium alloys Research methods. Methods of metallographic and micro X-ray spectral analysis. Determination of mechanical properties and heat resistance. Results. The regularities of the influence of alloying with aluminum on the formation of the hardening phase in magnesium alloys have been investigated. It is shown that an increase in the concentration of aluminum in magnesium alloy promotes refinement of the macro- and microstructure of the metal (reduces the grain size and the distance between the second-order dendritic axes) and also increases the amount of intermetallic phase. The positive effect of aluminum additives on the mechanical properties and heat resistance of cast metal has been established. The optimal level of alloying with aluminum (about 7,7 %) hes been determined, which ensures a sufficient level of mechanical properties and heat resistence. Scientific novelty. Based on the regression analysis of the experimental data, empirical equations were obtained that describe the dependences of the size of macro- and micrograins on the concentration of aluminum in magnesium alloys. It is shown that the optimal aluminum content in the magnesium alloy in the amount of ~ 7,7 % provides the best combination of mechanical properties (a sufficiently high strength and the highest plasticity) and heat resistance Practical value. It has been established that alloying magnesium alloys with aluminum is promising for improving the structure and increasing the mechanical properties and heat resistance of cast metal. This effect makes it possible to significantly expand the field of application of magnesium alloys in mechanical engineering and improve the performance of various equipment.
{"title":"The influence of aluminum on the formation of the hardening phase in magnesium alloys","authors":"V. Shalomeev, О. Lukianenko","doi":"10.15588/1607-6885-2021-2-2","DOIUrl":"https://doi.org/10.15588/1607-6885-2021-2-2","url":null,"abstract":"Purpose. Study of the effect of alloying with aluminum on structure formation, mechanical properties and heat resistance of magnesium alloys \u0000Research methods. Methods of metallographic and micro X-ray spectral analysis. Determination of mechanical properties and heat resistance. \u0000Results. The regularities of the influence of alloying with aluminum on the formation of the hardening phase in magnesium alloys have been investigated. It is shown that an increase in the concentration of aluminum in magnesium alloy promotes refinement of the macro- and microstructure of the metal (reduces the grain size and the distance between the second-order dendritic axes) and also increases the amount of intermetallic phase. The positive effect of aluminum additives on the mechanical properties and heat resistance of cast metal has been established. \u0000The optimal level of alloying with aluminum (about 7,7 %) hes been determined, which ensures a sufficient level of mechanical properties and heat resistence. \u0000Scientific novelty. Based on the regression analysis of the experimental data, empirical equations were obtained that describe the dependences of the size of macro- and micrograins on the concentration of aluminum in magnesium alloys. It is shown that the optimal aluminum content in the magnesium alloy in the amount of ~ 7,7 % provides the best combination of mechanical properties (a sufficiently high strength and the highest plasticity) and heat resistance \u0000Practical value. It has been established that alloying magnesium alloys with aluminum is promising for improving the structure and increasing the mechanical properties and heat resistance of cast metal. This effect makes it possible to significantly expand the field of application of magnesium alloys in mechanical engineering and improve the performance of various equipment.","PeriodicalId":423067,"journal":{"name":"Innovative Materials and Technologies in Metallurgy and Mechanical Engineering","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114866493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-14DOI: 10.15588/1607-6885-2021-2-6
V. Pleskach, V. Olshanetskii
Purpose. Optimization of the method of design and calculation of the composite matrices of molds for the manufacture of products from powder materials. Research methods. Analysis of stresses in the walls of solid and composite thick-walled cylinders and their existing calculations. Results. The peculiarities of stress formation in the wall of solid and composite thick-walled cylinders under the action of internal pressure are investigated. The possibility of applying the obtained results to determine the strength and stiffness of the wall of the mold for the manufacture of products from powder materials is analyzed. Limitations in ensuring the strength of the matrix by only increasing its thickness are determined. It is shown that the use of a matrix composed of an inner cylinder and an outer holder allows to use optimal stress redistribution in the walls of such matrix in order to reduce the size and, accordingly, save materials for its manufacture. The possibility of using various, better adapted materials for the manufacture of the inner wall of the matrix and permiting the reduction of the cost of manufacturing the mold are analyzed. The method of calculation of stresses in dangerous points of walls of a matrix at an estimation of their strength and stiffness is generalized. Formulas for determination of the guaranteed tension which will provide effective redistribution of stresses in walls of the composite matrix under the set operating conditions are given. Scientific novelty. Approaches to the analysis of stresses in the walls of composite matrices of molds under the influence of internal pressure are optimized and generalized . Mathematical dependences are given, which make it possible to determine the optimal dimensions of mold elements at action of pressing pressure. Practical value. The principles of design and methods of calculation of composite matrices of molds for the manufacture of products from powder materials are proposed.
{"title":"Optimization of structure matrix of mold forms","authors":"V. Pleskach, V. Olshanetskii","doi":"10.15588/1607-6885-2021-2-6","DOIUrl":"https://doi.org/10.15588/1607-6885-2021-2-6","url":null,"abstract":"Purpose. Optimization of the method of design and calculation of the composite matrices of molds for the manufacture of products from powder materials. \u0000Research methods. Analysis of stresses in the walls of solid and composite thick-walled cylinders and their existing calculations. \u0000Results. The peculiarities of stress formation in the wall of solid and composite thick-walled cylinders under the action of internal pressure are investigated. The possibility of applying the obtained results to determine the strength and stiffness of the wall of the mold for the manufacture of products from powder materials is analyzed. Limitations in ensuring the strength of the matrix by only increasing its thickness are determined. It is shown that the use of a matrix composed of an inner cylinder and an outer holder allows to use optimal stress redistribution in the walls of such matrix in order to reduce the size and, accordingly, save materials for its manufacture. The possibility of using various, better adapted materials for the manufacture of the inner wall of the matrix and permiting the reduction of the cost of manufacturing the mold are analyzed. \u0000The method of calculation of stresses in dangerous points of walls of a matrix at an estimation of their strength and stiffness is generalized. Formulas for determination of the guaranteed tension which will provide effective redistribution of stresses in walls of the composite matrix under the set operating conditions are given. \u0000Scientific novelty. Approaches to the analysis of stresses in the walls of composite matrices of molds under the influence of internal pressure are optimized and generalized . Mathematical dependences are given, which make it possible to determine the optimal dimensions of mold elements at action of pressing pressure. \u0000Practical value. The principles of design and methods of calculation of composite matrices of molds for the manufacture of products from powder materials are proposed. \u0000 ","PeriodicalId":423067,"journal":{"name":"Innovative Materials and Technologies in Metallurgy and Mechanical Engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122187218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-14DOI: 10.15588/1607-6885-2021-2-8
T. Tatarchuk, Yu. Kravchuk, V. Pelykh
Purpose. Analysis of methods of manufacturing centrifugal blades by 3D printing methods on the example of a modernized cooling system of the AI-450M engine of the Mi-2MSB helicopter. Research methods: calculation method of finite elements, analytical. Results. Studies have shown that the use of layer-by-layer printing technology of the centrifugal wheel of the cooling system provides the following opportunities and improvements: - reduce the percentage of rejection of finished products by 8–9 times; - reduce material consumption by 300–400 %; - increase the speed of production, experiments and testing the manufacture of working elements through the development of new technologies for rapid production (rapid fabrication); - easy printing of previously “impossible” geometry. The analysis of possible types of manufacturing of working centrifugal wheel and the calculated estimation of thermodynamic parameters in the course of step-by-step drawing of layers of metal is carried out. The problem of a large percentage of defects in the process of classical-mechanical milling of blades was solved by changing the type of production to additive one. Scientific novelty. In today's world, the spread of CAD / CAM / CAE / PLM technologies and the accumulation of a wide library of materials open up a large number of new and more efficient, in terms of economy and quality, methods of manufacturing components and units. Following the example of such giants in the production of aircraft engines as Rolls-Royce Motor, General Electric and Pratt & Whitney, it is clear that the use and development of the latest methods of three-dimensional printing is appropriate. Practical value. The obtained results are important in the further process of production and modernization ofMi-2 helicopter of all modifications with the latest engines, as well as for projects for the development of helicopter construction in Ukraine - МСБ-2 “Hope”, МСБ -6 “Otaman”, МСБ-8 and others. The ability to increase the efficiency of manufacturing the main working elements - blades allows you to reduce the cost of components, their further repair, operation. The most important factor is to increase reliability, as in the manufacture reduces the likelihood of defects, which will not be detected at the stages of intermediate and final control.
{"title":"Use of additive technologies in the manufacture of central impactors","authors":"T. Tatarchuk, Yu. Kravchuk, V. Pelykh","doi":"10.15588/1607-6885-2021-2-8","DOIUrl":"https://doi.org/10.15588/1607-6885-2021-2-8","url":null,"abstract":"Purpose. Analysis of methods of manufacturing centrifugal blades by 3D printing methods on the example of a modernized cooling system of the AI-450M engine of the Mi-2MSB helicopter. \u0000Research methods: calculation method of finite elements, analytical. \u0000Results. Studies have shown that the use of layer-by-layer printing technology of the centrifugal wheel of the cooling system provides the following opportunities and improvements: \u0000- reduce the percentage of rejection of finished products by 8–9 times; \u0000- reduce material consumption by 300–400 %; \u0000- increase the speed of production, experiments and testing the manufacture of working elements through the development of new technologies for rapid production (rapid fabrication); \u0000- easy printing of previously “impossible” geometry. \u0000The analysis of possible types of manufacturing of working centrifugal wheel and the calculated estimation of thermodynamic parameters in the course of step-by-step drawing of layers of metal is carried out. The problem of a large percentage of defects in the process of classical-mechanical milling of blades was solved by changing the type of production to additive one. \u0000Scientific novelty. In today's world, the spread of CAD / CAM / CAE / PLM technologies and the accumulation of a wide library of materials open up a large number of new and more efficient, in terms of economy and quality, methods of manufacturing components and units. Following the example of such giants in the production of aircraft engines as Rolls-Royce Motor, General Electric and Pratt & Whitney, it is clear that the use and development of the latest methods of three-dimensional printing is appropriate. \u0000Practical value. The obtained results are important in the further process of production and modernization ofMi-2 helicopter of all modifications with the latest engines, as well as for projects for the development of helicopter construction in Ukraine - МСБ-2 “Hope”, МСБ -6 “Otaman”, МСБ-8 and others. The ability to increase the efficiency of manufacturing the main working elements - blades allows you to reduce the cost of components, their further repair, operation. The most important factor is to increase reliability, as in the manufacture reduces the likelihood of defects, which will not be detected at the stages of intermediate and final control.","PeriodicalId":423067,"journal":{"name":"Innovative Materials and Technologies in Metallurgy and Mechanical Engineering","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115301420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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