Pub Date : 2022-12-20DOI: 10.54684/ijmmt.2022.14.2.280
S. Sezek, M. Kizilelma, B. Aksakal
"The stent is manufactured by traditional machining methods. This study has been carried out to improve the mechanical properties of stents produced by removing swarf. Production methods have been examined and extruded to produce a seamless cylindrical section pipe. The Mg-Zn-XX alloy used in stent production was used in this study. Extrusion mold design is made to produce stent with Mg-Zn-XX alloy. These parameters are optimized because temperature and friction values from the Extrusion parameters affect the shaping parameters of the generated stent. During optimization, the Simufact finite elements program was used. The optimization has shown that the Mg-Zn-XX alloy has the best styling results of friction of 300 o C de Coulumb 0.4. "
“支架是通过传统的机械加工方法制造的。本研究旨在改善通过去除切屑生产的支架的机械性能。对生产方法进行了检查并挤压生产出无缝圆柱形管。本研究使用了支架生产中使用的Mg-Zn-XX合金。挤压模具设计用于生产Mg-Zn-XX-哦。这些参数是优化的，因为来自挤压参数的温度和摩擦值影响生成的支架的成形参数。在优化过程中，使用了Simufact有限元程序。优化结果表明，Mg-Zn-XX合金在300°C de Coulumb 0.4的摩擦下具有最佳的造型效果。“
{"title":"OPTIMIZATION TEMPERATURE AND FRICTION STENT PRODUCTION PROCESS BY EXTRUSION METHOD","authors":"S. Sezek, M. Kizilelma, B. Aksakal","doi":"10.54684/ijmmt.2022.14.2.280","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.2.280","url":null,"abstract":"\"The stent is manufactured by traditional machining methods. This study has been carried out to improve the mechanical properties of stents produced by removing swarf. Production methods have been examined and extruded to produce a seamless cylindrical section pipe. The Mg-Zn-XX alloy used in stent production was used in this study. Extrusion mold design is made to produce stent with Mg-Zn-XX alloy. These parameters are optimized because temperature and friction values from the Extrusion parameters affect the shaping parameters of the generated stent. During optimization, the Simufact finite elements program was used. The optimization has shown that the Mg-Zn-XX alloy has the best styling results of friction of 300 o C de Coulumb 0.4. \"","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46164053","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.245
I. Spiridon, D. Isopescu, D. Ungureanu, N. Taranu, Sergiu Alupoae, C. Sbîrlea
This paper presents the set-up needed for an experimental study regarding the in-plane shear behaviour of stone masonry panels, strengthened with a prototype hemp reinforced mortar. Seven stone masonry panels will be designed and manufactured for this purpose: one unreinforced, three plastered on both sides and three plastered on a single side. The aim of this experimental study is to evaluate the effectiveness of the prototype hemp reinforced mortar in enhancing the shear strength and the displacement capacity of the stone masonry walls. In addition, the design and the manufacturing stages of the prototype hemp reinforced mortar have been carefully described, thus allowing an easy application of this TRM system on a large scale. Crucial aspects regarding the shear behaviour of stone masonry unstrengthen/strengthened walls, such as the quantification of the ultimate forces and displacements, the description of the dominant failure modes, and the characterization of the stress-strain state may be analysed by performing the envisaged experimental study based on the proposed set up.
{"title":"SHEAR STRUCTURAL RESPONSE OF A PROTOTYPE STRENGTHENING SYSTEM DESIGNED FOR STONE MASONRY PANELS","authors":"I. Spiridon, D. Isopescu, D. Ungureanu, N. Taranu, Sergiu Alupoae, C. Sbîrlea","doi":"10.54684/ijmmt.2022.14.3.245","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.245","url":null,"abstract":"This paper presents the set-up needed for an experimental study regarding the in-plane shear behaviour of stone masonry panels, strengthened with a prototype hemp reinforced mortar. Seven stone masonry panels will be designed and manufactured for this purpose: one unreinforced, three plastered on both sides and three plastered on a single side. The aim of this experimental study is to evaluate the effectiveness of the prototype hemp reinforced mortar in enhancing the shear strength and the displacement capacity of the stone masonry walls. In addition, the design and the manufacturing stages of the prototype hemp reinforced mortar have been carefully described, thus allowing an easy application of this TRM system on a large scale. Crucial aspects regarding the shear behaviour of stone masonry unstrengthen/strengthened walls, such as the quantification of the ultimate forces and displacements, the description of the dominant failure modes, and the characterization of the stress-strain state may be analysed by performing the envisaged experimental study based on the proposed set up.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48816856","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.233
G. Raicu, A. Raicu
Cybersecurity is now the one of the highest important part of the Industry 4.0 and to all the design and manufacturing companies. This paper presents new cybersecurity strategies in Industry 4.0, where current vulnerabilities and exploitation processes, possible attack vectors, attack, compromise, and performance indicators should be considered. Also, cyber risk in product lifecycle management is a very important aspect. This revealed authentication issues, unsecured communications, default deployment issues, susceptibility to physical attacks. For example, a successful cyberattack could bring subtle changes to the control parameters of a robot or of a manufacturing process. This can further change the robot's operating mode in an almost undetectable way, but instead alters the efficiency and integrity of the final product. By monitoring these behaviours, cataloguing indicators, and inspecting potential risks, we can determine how an attacker gains access to the network and predict the intent they had. We need well-trained staff in any enterprise to drastically reduce the risk of cyberattacks. For this reason, appropriate measures must be taken to solve these problems, and one of these is cybersecurity education. It is necessary to implement appropriate policies and risk reduction plans in the product lifecycle management to prevent possible cyber-attacks.
{"title":"CYBERSECURITY STRATEGIES IN INDUSTRY 4.0","authors":"G. Raicu, A. Raicu","doi":"10.54684/ijmmt.2022.14.3.233","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.233","url":null,"abstract":"Cybersecurity is now the one of the highest important part of the Industry 4.0 and to all the design and manufacturing companies. This paper presents new cybersecurity strategies in Industry 4.0, where current vulnerabilities and exploitation processes, possible attack vectors, attack, compromise, and performance indicators should be considered. Also, cyber risk in product lifecycle management is a very important aspect. This revealed authentication issues, unsecured communications, default deployment issues, susceptibility to physical attacks. For example, a successful cyberattack could bring subtle changes to the control parameters of a robot or of a manufacturing process. This can further change the robot's operating mode in an almost undetectable way, but instead alters the efficiency and integrity of the final product. By monitoring these behaviours, cataloguing indicators, and inspecting potential risks, we can determine how an attacker gains access to the network and predict the intent they had. We need well-trained staff in any enterprise to drastically reduce the risk of cyberattacks. For this reason, appropriate measures must be taken to solve these problems, and one of these is cybersecurity education. It is necessary to implement appropriate policies and risk reduction plans in the product lifecycle management to prevent possible cyber-attacks.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49195158","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.146
Alina Marguță, D. Nedelcu, S. Mazurchevici
Thermal behavior in plastic materials has a strong influence on their performance. In the current research, scientists are using different equipment that highlights the calorimetric behavior of parts by the identification and localization of transitions and exothermic/endothermic reactions that take place during material heating. The paper aims to characterize from a thermal point of view a lignin-based polymer (Arboblend V2 Nature) coated with three distinct micro-ceramic powders: two based on chrome oxide - Cr2O3, Cr2O3 -xSiO2 -yTiO2 (commercial name Amdry 6420 and Metco 136F) and one based on zirconium oxide - ZrO2 18TiO2 10Y2O3 (commercially known as Metco 143). The samples to be covered were obtained by injection in the mold and the coating technique used was a thermal – APS (Atmospheric Plasma Spray). After thermal analysis, all three coated samples reviled thermal stability up to 230°C, the degradation of the lignin matrix taking place around 345°C. Thus, based on this important data the recommendation to be used in practical applications can be made. So, the Arbobelnd V2 Nature bio-polymer coated with ceramic micro-particles works in normal working parameters for temperatures not exceeding 200°C. The paper also highlights in the beginning part the systemic analysis of the coating process in order to underline the factors that significantly influence the output parameters as: structure, morphology, mechanical, tribological, and thermal behavior.
{"title":"THERMAL BEHAVIOR OF COATED BIO-POLYMERS","authors":"Alina Marguță, D. Nedelcu, S. Mazurchevici","doi":"10.54684/ijmmt.2022.14.3.146","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.146","url":null,"abstract":"Thermal behavior in plastic materials has a strong influence on their performance. In the current research, scientists are using different equipment that highlights the calorimetric behavior of parts by the identification and localization of transitions and exothermic/endothermic reactions that take place during material heating. The paper aims to characterize from a thermal point of view a lignin-based polymer (Arboblend V2 Nature) coated with three distinct micro-ceramic powders: two based on chrome oxide - Cr2O3, Cr2O3 -xSiO2 -yTiO2 (commercial name Amdry 6420 and Metco 136F) and one based on zirconium oxide - ZrO2 18TiO2 10Y2O3 (commercially known as Metco 143). The samples to be covered were obtained by injection in the mold and the coating technique used was a thermal – APS (Atmospheric Plasma Spray). After thermal analysis, all three coated samples reviled thermal stability up to 230°C, the degradation of the lignin matrix taking place around 345°C. Thus, based on this important data the recommendation to be used in practical applications can be made. So, the Arbobelnd V2 Nature bio-polymer coated with ceramic micro-particles works in normal working parameters for temperatures not exceeding 200°C. The paper also highlights in the beginning part the systemic analysis of the coating process in order to underline the factors that significantly influence the output parameters as: structure, morphology, mechanical, tribological, and thermal behavior.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45064354","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.152
F. Memet
R134a is a refrigerant met in several marine refrigeration applications, such as fishing vessels, passenger and cargo ships. In 2014, 26% of the international commercial fleet was using R134a. Although R134a shows a null Ozone Depletion Potential, it has a quite high Global Warming Potential (1300). R134a is a greenhouse gas and, even if it is present on newer ships, the future will be marked by its replacement with substitutes having low GWP. Still, because its GWP is less than 2500, R 134a will continue to be used. Due to the fact that vapour compression refrigeration systems are dominant on board the ships and knowing that these technologies are high energy consumers, analysing their performance in the contemporary energetic context, is imperious required. This paper presents a theoretical analysis of a single stage vapour compression cycle, working with R134a, based on the laws of thermodynamics. The analysis will reveal the influence of the evaporator temperature on the Coefficient of performance and on exergy efficiency, and also the influence of sub cooling on these two efficiency terms, on the refrigerant mass flow rate and compression rate. It was considered a variation of the evaporator temperature in the range (-40÷ -10)oC and of the sub cooling in the range (0÷10)oC. The increase of the evaporator temperature will contribute to a COP increment (50%) and an exergy efficiency decrease (34%). The sub cooling will lead to both COP and exergy efficiency increase (11%). Higher sub cooling degree will provide an increment in the refrigerant mass flow (18%) and a decrease of the compression rate (76%) meaning lower work consumption at the compressor.
{"title":"EFFECTS OF VAPORIZATION TEMPERATURE AND SUB COOLING VARIATION ON THE PERFORMANCE OF A VAPOUR COMPRESSION REFRIGERATION CYCLE WORKING WITH R134A, MET ON NEWER SHIPS","authors":"F. Memet","doi":"10.54684/ijmmt.2022.14.3.152","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.152","url":null,"abstract":"R134a is a refrigerant met in several marine refrigeration applications, such as fishing vessels, passenger and cargo ships. In 2014, 26% of the international commercial fleet was using R134a. Although R134a shows a null Ozone Depletion Potential, it has a quite high Global Warming Potential (1300). R134a is a greenhouse gas and, even if it is present on newer ships, the future will be marked by its replacement with substitutes having low GWP. Still, because its GWP is less than 2500, R 134a will continue to be used. Due to the fact that vapour compression refrigeration systems are dominant on board the ships and knowing that these technologies are high energy consumers, analysing their performance in the contemporary energetic context, is imperious required. This paper presents a theoretical analysis of a single stage vapour compression cycle, working with R134a, based on the laws of thermodynamics. The analysis will reveal the influence of the evaporator temperature on the Coefficient of performance and on exergy efficiency, and also the influence of sub cooling on these two efficiency terms, on the refrigerant mass flow rate and compression rate. It was considered a variation of the evaporator temperature in the range (-40÷ -10)oC and of the sub cooling in the range (0÷10)oC. The increase of the evaporator temperature will contribute to a COP increment (50%) and an exergy efficiency decrease (34%). The sub cooling will lead to both COP and exergy efficiency increase (11%). Higher sub cooling degree will provide an increment in the refrigerant mass flow (18%) and a decrease of the compression rate (76%) meaning lower work consumption at the compressor.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44807181","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.158
M. Mihălcică, Vasile Gheorghe Gliga, M. Câmpean, Nicolae Constantin Cretu, A. Nauncef, R. Steigmann
In this paper, the manufacturing technologies of violins, followed by a study on the psycho-acoustic evaluation of violins with different anatomic structure of wood are presented. The evaluation was performed by music experts (performers, teachers, students) based on music auditions of excerpts recorded on the violins studied. The musical performance was performed by the same violinist, under the same conditions. Respondents rated five acoustic criteria. The statistic results showed that age, experience, gender influence the acoustic perception and also that the geometric characteristics of the violins produce different acoustic impressions.
{"title":"PSYCHO-ACOUSTIC ASSESSMENT OF VIOLINS WITH DIFFERENT ANATOMICAL FEATURES OF WOOD","authors":"M. Mihălcică, Vasile Gheorghe Gliga, M. Câmpean, Nicolae Constantin Cretu, A. Nauncef, R. Steigmann","doi":"10.54684/ijmmt.2022.14.3.158","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.158","url":null,"abstract":"In this paper, the manufacturing technologies of violins, followed by a study on the psycho-acoustic evaluation of violins with different anatomic structure of wood are presented. The evaluation was performed by music experts (performers, teachers, students) based on music auditions of excerpts recorded on the violins studied. The musical performance was performed by the same violinist, under the same conditions. Respondents rated five acoustic criteria. The statistic results showed that age, experience, gender influence the acoustic perception and also that the geometric characteristics of the violins produce different acoustic impressions.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46525510","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.181
S. Păcuraru, L. Domnișoru, A. Bekhit
This study aims at predicting the hydrodynamic response of an offshore AHTS vessel in regular and irregular waves. The study focuses on predicting the six degrees of freedom responses for ship in the operation condition when ship speed is equal to zero, at various heading angles (0, 45, 90, 135, 180, 225, 270, and 315˚) and for several wave frequencies (0.02~2.0 rad/s). The numerical simulation is carried out using the 3D diffraction/radiation Hydrostar software that is based on potential theory to predict the wave-body interactions. All the hydrostatics, loading and sailing aspects are initially estimated, and then introduced as an input in the simulation process corresponding to the ship speed and heading directions. For the irregular sea simulations, the ITTC spectrum is used to describe the wave for a generic case study in the Black Sea in order to make the study feasible for offshore applications in operational conditions. Further investigations are made using the ISIS_CFD viscous flow solver of the FINETM/Marine software (only for regular waves) to compare the obtained results. The results are presented for the ship response with a considered accuracy based on the previous validations performed by the authors for similar ships.
{"title":"NUMERICAL SIMULATION FOR THE MOTION RESPONSE OF AN OFFSHORE AHTS SHIP IN REGULAR AND IRREGULAR WAVES","authors":"S. Păcuraru, L. Domnișoru, A. Bekhit","doi":"10.54684/ijmmt.2022.14.3.181","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.181","url":null,"abstract":"This study aims at predicting the hydrodynamic response of an offshore AHTS vessel in regular and irregular waves. The study focuses on predicting the six degrees of freedom responses for ship in the operation condition when ship speed is equal to zero, at various heading angles (0, 45, 90, 135, 180, 225, 270, and 315˚) and for several wave frequencies (0.02~2.0 rad/s). The numerical simulation is carried out using the 3D diffraction/radiation Hydrostar software that is based on potential theory to predict the wave-body interactions. All the hydrostatics, loading and sailing aspects are initially estimated, and then introduced as an input in the simulation process corresponding to the ship speed and heading directions. For the irregular sea simulations, the ITTC spectrum is used to describe the wave for a generic case study in the Black Sea in order to make the study feasible for offshore applications in operational conditions. Further investigations are made using the ISIS_CFD viscous flow solver of the FINETM/Marine software (only for regular waves) to compare the obtained results. The results are presented for the ship response with a considered accuracy based on the previous validations performed by the authors for similar ships.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47618463","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.70
C. Grigoras, V. Zichil, Cătălin Drob, V. Ciubotariu
: Constant industrial processes improvements represent a fundamental step in the evolution of efficient processing. Due to physical or financial limits, there is a limit to how the mechanical or electronic side can be optimised. A solution for improving industrial processes can come in the form of complex machine algorithms that analyse the process in real-time and decide, with each step, what is optimal. To put this statement into practise, we have designed and implemented a fully operational self-adaptive stretch forming process controlled with the help of a dedicated statistical analysis algorithm. The foundation of the algorithm lies in the deformation theory of metals. In its simplest form, it can be summarised that if a sheet of metal is stretched, its length will increase as the force acting upon it increases until the ultimate tensile strength limit is reached; after this limit, failure occurs. Therefore, the algorithm analyses the material strain controlling the bi-axial nature of the stretch forming process by constantly adjusting for axial force and die speed. It does this through complex computer-vision image analysis techniques for strain measurement and stretching pressure readings as input data. The readings are analysed using the ANOVA method, providing R-squared and p-values for stretching pressure and die speed. The decisions that the algorithm takes are based on the statistical analysis of its previous decision, aiming to improve the overall process R-squared. The overall results are validated by measuring the obtained stretched parts’ deviation to the die shape. Therefore, the measurements were taken using a GOM 3D measuring system. This paper aims to explain the methodology of the algorithm using how the measurements are taken, how the statical analysis generated decisions for controlling the industrial equipment, and to analyse the statistical data generated by the self-adaptive stretch forming algorithm for the experimental study by comparing the decision it takes for each for the 20 processed 1050 aluminium alloys blanks. The results indicate the ideal succession of decisions and which path should be taken to improve the decision-making for both elastic and plastic domains.
{"title":"ANALYSIS OF THE STATISTICAL DATA GENERATED BY AN ADAPTIVE STRETCH FORMING PROCESS","authors":"C. Grigoras, V. Zichil, Cătălin Drob, V. Ciubotariu","doi":"10.54684/ijmmt.2022.14.3.70","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.70","url":null,"abstract":": Constant industrial processes improvements represent a fundamental step in the evolution of efficient processing. Due to physical or financial limits, there is a limit to how the mechanical or electronic side can be optimised. A solution for improving industrial processes can come in the form of complex machine algorithms that analyse the process in real-time and decide, with each step, what is optimal. To put this statement into practise, we have designed and implemented a fully operational self-adaptive stretch forming process controlled with the help of a dedicated statistical analysis algorithm. The foundation of the algorithm lies in the deformation theory of metals. In its simplest form, it can be summarised that if a sheet of metal is stretched, its length will increase as the force acting upon it increases until the ultimate tensile strength limit is reached; after this limit, failure occurs. Therefore, the algorithm analyses the material strain controlling the bi-axial nature of the stretch forming process by constantly adjusting for axial force and die speed. It does this through complex computer-vision image analysis techniques for strain measurement and stretching pressure readings as input data. The readings are analysed using the ANOVA method, providing R-squared and p-values for stretching pressure and die speed. The decisions that the algorithm takes are based on the statistical analysis of its previous decision, aiming to improve the overall process R-squared. The overall results are validated by measuring the obtained stretched parts’ deviation to the die shape. Therefore, the measurements were taken using a GOM 3D measuring system. This paper aims to explain the methodology of the algorithm using how the measurements are taken, how the statical analysis generated decisions for controlling the industrial equipment, and to analyse the statistical data generated by the self-adaptive stretch forming algorithm for the experimental study by comparing the decision it takes for each for the 20 processed 1050 aluminium alloys blanks. The results indicate the ideal succession of decisions and which path should be taken to improve the decision-making for both elastic and plastic domains.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48657348","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.124
S. B. Almaliki
The productivity of manufacturing activities is highly dependent on the quality of the processing machines and the readiness of their parts at all work times. The cutting tools are among these crucial parts for many manufacturing processes and hence their outer surfaces need continuous maintenance processes such as thermal hardening and coating. The physical and thermal properties of these outer surfaces are mathematically and numerically analyzed by the application of Ohm`s and Kirchhoff`s laws during the thermal hardening process to determine the best operation schemes and governing variables that may produce the highest performance and improve the quality of these machines` moving parts. The improvement of this maintenance process via the inclusion of the Nano-materials into the coating surfaces of the understudy parts is one of the tentative outcomes of these analyses. The results reflect the high role of the usage of inline cooling systems for the removal of heat, and that the maximum temperature in the contact area of the deformation region and corresponding processing speed, have a high share in the decision of the exterior layer`s material for the hardening work tool to develop into the critical state of shift instability.
{"title":"MATHEMATICAL AND NUMERICAL SIMULATION OF THE THERMALLY HARDENED COATED MACHINE SURFACES","authors":"S. B. Almaliki","doi":"10.54684/ijmmt.2022.14.3.124","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.124","url":null,"abstract":"The productivity of manufacturing activities is highly dependent on the quality of the processing machines and the readiness of their parts at all work times. The cutting tools are among these crucial parts for many manufacturing processes and hence their outer surfaces need continuous maintenance processes such as thermal hardening and coating. The physical and thermal properties of these outer surfaces are mathematically and numerically analyzed by the application of Ohm`s and Kirchhoff`s laws during the thermal hardening process to determine the best operation schemes and governing variables that may produce the highest performance and improve the quality of these machines` moving parts. The improvement of this maintenance process via the inclusion of the Nano-materials into the coating surfaces of the understudy parts is one of the tentative outcomes of these analyses. The results reflect the high role of the usage of inline cooling systems for the removal of heat, and that the maximum temperature in the contact area of the deformation region and corresponding processing speed, have a high share in the decision of the exterior layer`s material for the hardening work tool to develop into the critical state of shift instability.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44061127","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 : 2022-12-20DOI: 10.54684/ijmmt.2022.14.3.56
C. Dumitrache, D. Deleanu
In this article we have designed the active parts of a centrifugal pump (volute casing and impeller) often used in the naval field, especially for ballasting installations of commercial shipping vessels. Data on dimensions, geometry and mode of operation were used from specialized technical documentation and the works of other authors. The design of the volute casing and impeller assembly was done with NX SIEMENS. The study of the fluid flow was done with ANSYS CFX by importing the whole, some conclusions were drawn regarding the fluid velocities and the pressure field. The influence of the cavitation phenomenon was taken into account by modelling this phenomenon, thus avoiding the appearance of the minimum negative pressures field. It is known what is the adverse influence of the cavitation phenomenon and what are the factors that can reduce the occurrence of this phenomenon.
{"title":"WATER CENTRIFUGAL PUMP, DESIGN AND FLUID FLOW ANALYSIS","authors":"C. Dumitrache, D. Deleanu","doi":"10.54684/ijmmt.2022.14.3.56","DOIUrl":"https://doi.org/10.54684/ijmmt.2022.14.3.56","url":null,"abstract":"In this article we have designed the active parts of a centrifugal pump (volute casing and impeller) often used in the naval field, especially for ballasting installations of commercial shipping vessels. Data on dimensions, geometry and mode of operation were used from specialized technical documentation and the works of other authors. The design of the volute casing and impeller assembly was done with NX SIEMENS. The study of the fluid flow was done with ANSYS CFX by importing the whole, some conclusions were drawn regarding the fluid velocities and the pressure field. The influence of the cavitation phenomenon was taken into account by modelling this phenomenon, thus avoiding the appearance of the minimum negative pressures field. It is known what is the adverse influence of the cavitation phenomenon and what are the factors that can reduce the occurrence of this phenomenon.","PeriodicalId":38009,"journal":{"name":"International Journal of Modern Manufacturing Technologies","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47461848","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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