Pub Date : 2020-04-27DOI: 10.15587/1729-4061.2020.198962
A. Dudnikov, O. Gorbenko, A. Kelemesh, Olga Drozhchana
An analysis of the wear of machine parts has made it possible to establish characteristic requirements for the technological process of restoring worn surfaces. Experimental studies on hardening the working surfaces of plowshares have made it possible to determine processing parameters: oscillation frequency of the processing tool of 1,400 min -1 , the oscillation amplitude of 0.5 mm and processing time of 20 s. Studies of the influence of conventional and vibration working on strength characteristics were carried out first on models and then on actual parts. New shares served as models. Experimental studies of these shares provided the identity of the nature of the cutting element wear. The sameness of the model and the actual part deformation degree was provided by the same conditions of the passage of the hardening processes. The trustworthiness of the results of experimental studies was assessed in accordance with the law of theoretical distribution at a given value of confidence probability α=0.95. The studies have established that the share width of 116–117.5 mm which has a certain effect on the share efficiency corresponds to the highest probability of 0.39. It has been experimentally established that the degree of hardening of the shares made of L-53 steel and surfaced with sormite and vibration hardened is 1.85 times greater than in conventional processing. The studies have made it possible to determine the nature of change in the share shape and thickness of the cutting edge and choose a more efficient process of its restoration by vibration hardening. A method of recovering shares by welding strips of 45 steel with automatic hard surfacing and vibration hardening was proposed
通过对机械零件磨损的分析，可以确定修复磨损表面工艺过程的特性要求。通过对犁铧工作面硬化的实验研究，确定了加工参数:加工刀具振荡频率为1400 min -1，振荡幅度为0.5 mm，加工时间为20 s。首先在模型上进行了常规加工和振动加工对强度特性的影响研究，然后在实际零件上进行了研究。新股充当了模型。这些份额的实验研究提供了特性的切削元件磨损。通过硬化过程的相同条件，保证了模型与实际零件变形程度的一致性。在给定置信概率α=0.95时，根据理论分布规律对实验研究结果的可信度进行评估。研究表明，116-117.5 mm的份额宽度对份额效率有一定影响，对应的最高概率为0.39。经实验证实，用L-53钢表面加索麦粉和振动淬火后，钢坯的硬化程度是常规淬火的1.85倍。这些研究使确定刃口形状和厚度变化的性质成为可能，并选择一种更有效的振动硬化恢复过程。提出了一种45钢带钢自动堆焊和振动硬化的补钢方法
{"title":"Improving the Technological Process of Restoring the Tillage Machine Working Parts","authors":"A. Dudnikov, O. Gorbenko, A. Kelemesh, Olga Drozhchana","doi":"10.15587/1729-4061.2020.198962","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.198962","url":null,"abstract":"An analysis of the wear of machine parts has made it possible to establish characteristic requirements for the technological process of restoring worn surfaces. Experimental studies on hardening the working surfaces of plowshares have made it possible to determine processing parameters: oscillation frequency of the processing tool of 1,400 min -1 , the oscillation amplitude of 0.5 mm and processing time of 20 s. Studies of the influence of conventional and vibration working on strength characteristics were carried out first on models and then on actual parts. New shares served as models. Experimental studies of these shares provided the identity of the nature of the cutting element wear. The sameness of the model and the actual part deformation degree was provided by the same conditions of the passage of the hardening processes. The trustworthiness of the results of experimental studies was assessed in accordance with the law of theoretical distribution at a given value of confidence probability α=0.95. The studies have established that the share width of 116–117.5 mm which has a certain effect on the share efficiency corresponds to the highest probability of 0.39. It has been experimentally established that the degree of hardening of the shares made of L-53 steel and surfaced with sormite and vibration hardened is 1.85 times greater than in conventional processing. The studies have made it possible to determine the nature of change in the share shape and thickness of the cutting edge and choose a more efficient process of its restoration by vibration hardening. A method of recovering shares by welding strips of 45 steel with automatic hard surfacing and vibration hardening was proposed","PeriodicalId":412391,"journal":{"name":"ChemRN: Materials Processing (Topic)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125505302","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 : 2020-02-24DOI: 10.15587/1729-4061.2020.195050
Tetiana Nadryhailo, V. Vernyhora, A. Korobochka, A. Sasov
Thousands of tons of metal-containing sludge are produced every month at machine-building, especially bearing producing and metallurgy enterprises where is processed. In the production of bearings, up to 10.0 thousand tons of sludge containing up to 90 % of the metal fraction is produced annually. At present, the sludge is practically nonrecyclable and brought to landfills degrading the environment. To increase the uniformity of metal powder at the stage of sludge washing, it is necessary to separate the solid articles by their density. To solve this issue, a comprehensive system of environmentally friendly technology is used for reclaiming the grinding sludge where in the process of movement of the sludge particles in a flow of detergent solution, their washing and separation by density take place. The study of the trajectory of motion of solid sludge particles makes it possible to set the mode parameters of the gutter which provide effective separation of particles by density. This enables determining the height of separator installation in the solution flow and obtaining a larger percentage of homogeneous metal particles. The main parameters of the washing gutter which can ensure effective separation of metal and abrasive particles include length and width of the gutter, level of the solution flow, flow rate of the solution, flow rate of fluid through the sidewall of the gutter, flow rate of solution through nozzles, number of nozzles and distance between them. Based on theoretical studies and a mathematical model describing the motion of metallic and abrasive particles in a detergent solution, a program in the C++ language and in the C++ Builder 6 programming environment was developed. The developed program makes it possible to simulate trajectories of motion of metal and abrasive particles in the detergent solution flow in the gutter. In the mode of random particle parameters, diameter in a range of 18–500 μm for metal particles and in a range of 31–200 μm for abrasive particles is selected
{"title":"Modeling the Trajectory of Motion of Metallic and Abrasive Particles in a Washing Gutter","authors":"Tetiana Nadryhailo, V. Vernyhora, A. Korobochka, A. Sasov","doi":"10.15587/1729-4061.2020.195050","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.195050","url":null,"abstract":"Thousands of tons of metal-containing sludge are produced every month at machine-building, especially bearing producing and metallurgy enterprises where is processed. In the production of bearings, up to 10.0 thousand tons of sludge containing up to 90 % of the metal fraction is produced annually. At present, the sludge is practically nonrecyclable and brought to landfills degrading the environment. To increase the uniformity of metal powder at the stage of sludge washing, it is necessary to separate the solid articles by their density. To solve this issue, a comprehensive system of environmentally friendly technology is used for reclaiming the grinding sludge where in the process of movement of the sludge particles in a flow of detergent solution, their washing and separation by density take place. The study of the trajectory of motion of solid sludge particles makes it possible to set the mode parameters of the gutter which provide effective separation of particles by density. This enables determining the height of separator installation in the solution flow and obtaining a larger percentage of homogeneous metal particles. The main parameters of the washing gutter which can ensure effective separation of metal and abrasive particles include length and width of the gutter, level of the solution flow, flow rate of the solution, flow rate of fluid through the sidewall of the gutter, flow rate of solution through nozzles, number of nozzles and distance between them. Based on theoretical studies and a mathematical model describing the motion of metallic and abrasive particles in a detergent solution, a program in the C++ language and in the C++ Builder 6 programming environment was developed. The developed program makes it possible to simulate trajectories of motion of metal and abrasive particles in the detergent solution flow in the gutter. In the mode of random particle parameters, diameter in a range of 18–500 μm for metal particles and in a range of 31–200 μm for abrasive particles is selected","PeriodicalId":412391,"journal":{"name":"ChemRN: Materials Processing (Topic)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133874706","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}
A. Aubert, R. Madugundo, A. M. Schönhöbel, D. Salazar, J. Garitaonandia, J. Barandiarán, G. Hadjipanayis
Abstract The influence of quenching rate and nitrogenation in melt-spun Nd1.2Fe10.6Mo1.4 has been investigated in terms of microstructure, phase formation and magnetic properties. Increasing the quenching rate leads to smaller grain size. However, it also implies a change in the crystallized phase structure. We obtained a pure ThMn12 (1:12) structure at quenching rates up to 30 m/s, leading to an average grain size of 220 nm. Magnetic measurements of the as-spun ribbons revealed a reduction of the saturation magnetization for samples quenched above 30 m/s. This is attributed to the formation of a paramagnetic phase and/or magnetic phase with a Curie temperature (TC) close to room temperature which is confirmed by 57Fe Mossbauer spectroscopy. The analysis of the spectra rules out the presence of a ferromagnetic TbCu7 (1:7) phase, which is usually reported in such system. The ribbons were nitrogenated in order to form the harder magnetic phase Nd1.2Fe10.6Mo1.4Nx. The ribbon quenched at 30 m/s with the pure ThMn12 nitride structure is the optimum sample for getting hard magnetic properties, with a coercivity of 0.6 T, saturation magnetization of 1.15 T and Curie temperature of 350 °C. Finally, we show the good stability of the later phase structure at elevated temperatures (≤ TC), making this compound a good candidate for permanent magnet applications.
{"title":"Structural and Magnetic Properties of Nd-Fe-Mo-(N) Melt-Spun Ribbons with Thmn12 Structure","authors":"A. Aubert, R. Madugundo, A. M. Schönhöbel, D. Salazar, J. Garitaonandia, J. Barandiarán, G. Hadjipanayis","doi":"10.2139/ssrn.3532116","DOIUrl":"https://doi.org/10.2139/ssrn.3532116","url":null,"abstract":"Abstract The influence of quenching rate and nitrogenation in melt-spun Nd1.2Fe10.6Mo1.4 has been investigated in terms of microstructure, phase formation and magnetic properties. Increasing the quenching rate leads to smaller grain size. However, it also implies a change in the crystallized phase structure. We obtained a pure ThMn12 (1:12) structure at quenching rates up to 30 m/s, leading to an average grain size of 220 nm. Magnetic measurements of the as-spun ribbons revealed a reduction of the saturation magnetization for samples quenched above 30 m/s. This is attributed to the formation of a paramagnetic phase and/or magnetic phase with a Curie temperature (TC) close to room temperature which is confirmed by 57Fe Mossbauer spectroscopy. The analysis of the spectra rules out the presence of a ferromagnetic TbCu7 (1:7) phase, which is usually reported in such system. The ribbons were nitrogenated in order to form the harder magnetic phase Nd1.2Fe10.6Mo1.4Nx. The ribbon quenched at 30 m/s with the pure ThMn12 nitride structure is the optimum sample for getting hard magnetic properties, with a coercivity of 0.6 T, saturation magnetization of 1.15 T and Curie temperature of 350 °C. Finally, we show the good stability of the later phase structure at elevated temperatures (≤ TC), making this compound a good candidate for permanent magnet applications.","PeriodicalId":412391,"journal":{"name":"ChemRN: Materials Processing (Topic)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133590543","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}
In this study, the modeling of the cantilever pipe with MR damper to suppress the vibration caused by fluid flow is successfully modeled. The governing equation in this piping system is derived form the Newtonian approach. Similarly, the proposed model is checked with supplying the different velocity of water flowing pipe. As the axially flowing fluid velocity is increased, the transverse vibration on the tip end is also increased.
{"title":"A Study on Modeling of Cantilever Pipe with MR Damper to Suppress Fluid Induced Vibration","authors":"Thakur Dhakal, Sung-Chul Hong, Woo-Cheul Park","doi":"10.2139/ssrn.3504083","DOIUrl":"https://doi.org/10.2139/ssrn.3504083","url":null,"abstract":"In this study, the modeling of the cantilever pipe with MR damper to suppress the vibration caused by fluid flow is successfully modeled. The governing equation in this piping system is derived form the Newtonian approach. Similarly, the proposed model is checked with supplying the different velocity of water flowing pipe. As the axially flowing fluid velocity is increased, the transverse vibration on the tip end is also increased.","PeriodicalId":412391,"journal":{"name":"ChemRN: Materials Processing (Topic)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131616617","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 : 2019-08-28DOI: 10.21303/978-9949-7316-9-5
I. Nazarenko, L. Pelevin, Oleksandr Kostenyuk, O. Dedov, A. Fomin, M. Ruchynskyi, A. Sviderskyi, Y. Mishchuk, Volodymyr Slipetskyi
The monograph is devoted to the development of mechanical systems with dynamic effects on processing media. A new approach and methodology is proposed, taking into account the influence of energy fields of physical and me-chanical effects, the transformation and inversion of types of energy exposure. The model of dispersed media under consideration in the range of the process of destruction, grinding and compaction is considered. The revealed changes in the parameters of subsystems: working media, mechanical systems, the process-es of their interaction are studied based on the consideration of their stress-strain state. The analysis of combinations and their influence on the intensity of phy-sical and mechanical processes is carried out. The intensification of physical and mechanical processes, methods and means of their creation are achieved by the formulated idea: systematization and complexity of approaches through a joint consideration of the mutual influence of the internal properties of the subsys-tems made it possible to identify the general laws of their changes and take them into account in the work process. The movement of the working media during high-speed and impact destruction with differentiation of the working area is de-scribed. Structuring of the shock process, the formation of entropy destruction, the use of self-organization and the evolution of geometric shapes are evaluated. The process of grinding materials by a vibratory jaw crusher is investigated and methods for determining the effective parameters and their operation modes are proposed. The process of compaction of the processing medium in the field of vibrations in the device with spatial vibrations is described. The laws of change in the device movement, taking into account interaction with the processing medium are established. As a research result, new properties of the behavior of discrete-continuous systems under power load are disclosed. For the first time, stresses and strains are taken into account as working bodies and media for creating energy-saving vibration systems for compaction of building materials. The conducted scientific study makes it possible to obtain the laws of change in the state of dispersed media under the action of power loads by mechanical sys-tems. Minimization of energy costs and increase the efficiency of work processes is proposed when implementing various technological processes.
{"title":"Applied Problems of Motion of Mechanical Systems Under Action of Power Loads","authors":"I. Nazarenko, L. Pelevin, Oleksandr Kostenyuk, O. Dedov, A. Fomin, M. Ruchynskyi, A. Sviderskyi, Y. Mishchuk, Volodymyr Slipetskyi","doi":"10.21303/978-9949-7316-9-5","DOIUrl":"https://doi.org/10.21303/978-9949-7316-9-5","url":null,"abstract":"The monograph is devoted to the development of mechanical systems with dynamic effects on processing media. A new approach and methodology is proposed, taking into account the influence of energy fields of physical and me-chanical effects, the transformation and inversion of types of energy exposure. The model of dispersed media under consideration in the range of the process of destruction, grinding and compaction is considered. The revealed changes in the parameters of subsystems: working media, mechanical systems, the process-es of their interaction are studied based on the consideration of their stress-strain state. The analysis of combinations and their influence on the intensity of phy-sical and mechanical processes is carried out. The intensification of physical and mechanical processes, methods and means of their creation are achieved by the formulated idea: systematization and complexity of approaches through a joint consideration of the mutual influence of the internal properties of the subsys-tems made it possible to identify the general laws of their changes and take them into account in the work process. The movement of the working media during high-speed and impact destruction with differentiation of the working area is de-scribed. Structuring of the shock process, the formation of entropy destruction, the use of self-organization and the evolution of geometric shapes are evaluated. The process of grinding materials by a vibratory jaw crusher is investigated and methods for determining the effective parameters and their operation modes are proposed. The process of compaction of the processing medium in the field of vibrations in the device with spatial vibrations is described. The laws of change in the device movement, taking into account interaction with the processing medium are established. As a research result, new properties of the behavior of discrete-continuous systems under power load are disclosed. For the first time, stresses and strains are taken into account as working bodies and media for creating energy-saving vibration systems for compaction of building materials. The conducted scientific study makes it possible to obtain the laws of change in the state of dispersed media under the action of power loads by mechanical sys-tems. Minimization of energy costs and increase the efficiency of work processes is proposed when implementing various technological processes.","PeriodicalId":412391,"journal":{"name":"ChemRN: Materials Processing (Topic)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124458387","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}
The concept of Multi-Operational Mechanical Machine is mainly conceived for production based industries. Industries are basically meant for production of useful goods and services at low production cost. Today in this world every task have been made quicker and easier by making use of technology advancement but this advancement also demands huge investment and expenditure. Every industry tries to achieve high productivity maintaining the quality and standard of the product at low average cost. We have developed a conceptual model of a machine which would be capable of performing different operations simultaneously at high efficiency. The machine proposed in this project can perform tasks like drilling, cutting and grinding at one work station. It also reduces the cost of installing four different machines for performing each task and reduces the movement of work and operator. It will also improve efficiency and reduce cost of the product.
{"title":"Multi Operational Mechanical Machine","authors":"Rajendra Sharma","doi":"10.2139/ssrn.3398907","DOIUrl":"https://doi.org/10.2139/ssrn.3398907","url":null,"abstract":"The concept of Multi-Operational Mechanical Machine is mainly conceived for production based industries. Industries are basically meant for production of useful goods and services at low production cost. Today in this world every task have been made quicker and easier by making use of technology advancement but this advancement also demands huge investment and expenditure. Every industry tries to achieve high productivity maintaining the quality and standard of the product at low average cost. We have developed a conceptual model of a machine which would be capable of performing different operations simultaneously at high efficiency. The machine proposed in this project can perform tasks like drilling, cutting and grinding at one work station. It also reduces the cost of installing four different machines for performing each task and reduces the movement of work and operator. It will also improve efficiency and reduce cost of the product.","PeriodicalId":412391,"journal":{"name":"ChemRN: Materials Processing (Topic)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128904991","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}
The concept of pull production systems, such as kanban and CONWIP (Constant-Work-In-Progress), has been proposed for a long time. Although they have been implemented at some production systems with positive outcomes, some failure cases have also been reported. To find out the reason, a fundamental study of pull systems is conducted through queueing theory in this work. The theory of pull systems is developed from the perspective of information. The main advantage of kanban is to facilitate synchronization in an assembly line. However, consistent with prior observations, we find productivity improvement is achieved through variability reduction rather than kanban, and both kanban and CONWIP will reduce system capacity. To enjoy the benefit of kanban and avoid its shortcomings, a proactive pull system based on queue times is proposed. Numerical examples are given to illustrate the concepts. The implementation and benefit of proactive pull systems are explained through a case study in a semiconductor fab.
{"title":"Proactive Pull Systems with Applications","authors":"Kan Wu","doi":"10.2139/ssrn.3387962","DOIUrl":"https://doi.org/10.2139/ssrn.3387962","url":null,"abstract":"The concept of pull production systems, such as kanban and CONWIP (Constant-Work-In-Progress), has been proposed for a long time. Although they have been implemented at some production systems with positive outcomes, some failure cases have also been reported. To find out the reason, a fundamental study of pull systems is conducted through queueing theory in this work. The theory of pull systems is developed from the perspective of information. The main advantage of kanban is to facilitate synchronization in an assembly line. However, consistent with prior observations, we find productivity improvement is achieved through variability reduction rather than kanban, and both kanban and CONWIP will reduce system capacity. To enjoy the benefit of kanban and avoid its shortcomings, a proactive pull system based on queue times is proposed. Numerical examples are given to illustrate the concepts. The implementation and benefit of proactive pull systems are explained through a case study in a semiconductor fab.","PeriodicalId":412391,"journal":{"name":"ChemRN: Materials Processing (Topic)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123628479","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}
Present work deals with the removal of Zinc (Zn) from metal plating industry effluent (MPE) using peanut husk as a modified agricultural adsorbent (MAA). The adsorption of zinc from metal plating effluent has been investigated along with various adsorbent parameters. The MPE was investigated for various parameters like pH, adsorbent doze dose, contact time, initial zinc concentration and temperature. The maximum removal efficiency of zinc was found to be (75.85 %) at pH 3.5 and time 250 min). The sludge obtained after adsorption has been filtered followed by drying which can be used in a boiler furnace as a fuel.
{"title":"Expulsion of Zn from the Downstream of Metal Plating Effluent onto Modified Agricultural Adsorbent Prepared from Peanut Shell","authors":"D. Sharma, P. Chaudhari, Abhinesh Kumar Prajapati","doi":"10.2139/ssrn.3368077","DOIUrl":"https://doi.org/10.2139/ssrn.3368077","url":null,"abstract":"Present work deals with the removal of Zinc (Zn) from metal plating industry effluent (MPE) using peanut husk as a modified agricultural adsorbent (MAA). The adsorption of zinc from metal plating effluent has been investigated along with various adsorbent parameters. The MPE was investigated for various parameters like pH, adsorbent doze dose, contact time, initial zinc concentration and temperature. The maximum removal efficiency of zinc was found to be (75.85 %) at pH 3.5 and time 250 min). The sludge obtained after adsorption has been filtered followed by drying which can be used in a boiler furnace as a fuel.","PeriodicalId":412391,"journal":{"name":"ChemRN: Materials Processing (Topic)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126416646","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}
H. Parsamehr, Chun-Liang Yang, Wei-Ting Liu, Shi-Wei Chen, Shou-Yi Chang, Lih-Juann Chen, A. Tsai, C. Lai
Abstract Al-Cu-Fe based quasicrystal thin films exhibit unique surface and mechanical properties. To better understand the formation of the quasicrystal thin films, we observe direct growth of quasicrystals, prepared in a multilayer Al-Cu-Fe thin films with subsequent heat treatment, by in-situ synchrotron x-ray diffraction and in-situ transmission electron microscopy during heating and cooling. Using these two methods, we show that the ternary phase is more thermodynamically stable compared to the binary phases at temperature higher than 470 °C during the heating process, and quasicrystal formation occurs during the cooling process, specifically at 660 °C, after the sample has reached a liquid state. To distinguish quasicrystal from approximant crystals in the obtained thin film samples, we use high resolution x-ray diffraction to analyze the sample at room temperature. We reveal that the peak broadening increases monotonically along the twofold, threefold, and fivefold high-symmetry directions with the physical scattering vector but does not have systematic dependence on the phason momentum, which suggests that the thin film sample is indeed a quasicrystal instead of approximant crystals and it is almost free of phason strain. Our study provides a complete understanding of the growth mechanism for thin film Al-Cu-Fe quasicrystals, which is of particular importance for developing versatile applications of quasicrystal thin films.
{"title":"Direct Observation of Growth and Stability of Al-Cu-Fe Quasicrystal Thin Films","authors":"H. Parsamehr, Chun-Liang Yang, Wei-Ting Liu, Shi-Wei Chen, Shou-Yi Chang, Lih-Juann Chen, A. Tsai, C. Lai","doi":"10.2139/ssrn.3310173","DOIUrl":"https://doi.org/10.2139/ssrn.3310173","url":null,"abstract":"Abstract Al-Cu-Fe based quasicrystal thin films exhibit unique surface and mechanical properties. To better understand the formation of the quasicrystal thin films, we observe direct growth of quasicrystals, prepared in a multilayer Al-Cu-Fe thin films with subsequent heat treatment, by in-situ synchrotron x-ray diffraction and in-situ transmission electron microscopy during heating and cooling. Using these two methods, we show that the ternary phase is more thermodynamically stable compared to the binary phases at temperature higher than 470 °C during the heating process, and quasicrystal formation occurs during the cooling process, specifically at 660 °C, after the sample has reached a liquid state. To distinguish quasicrystal from approximant crystals in the obtained thin film samples, we use high resolution x-ray diffraction to analyze the sample at room temperature. We reveal that the peak broadening increases monotonically along the twofold, threefold, and fivefold high-symmetry directions with the physical scattering vector but does not have systematic dependence on the phason momentum, which suggests that the thin film sample is indeed a quasicrystal instead of approximant crystals and it is almost free of phason strain. Our study provides a complete understanding of the growth mechanism for thin film Al-Cu-Fe quasicrystals, which is of particular importance for developing versatile applications of quasicrystal thin films.","PeriodicalId":412391,"journal":{"name":"ChemRN: Materials Processing (Topic)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132993413","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}
Wear process takes predominant role in reducing the tool life during machining of steel. Tool wear is the progressive loss of material from the surface of the body of a tool. This occurs as a natural consequence when two surfaces with relative motion interact with each other. Challenges of wear mechanisms such as variation in chips, high pressure loads and spring back are responsible for tool wear. In addition the rate of tool wear depends on tool and work piece materials, tool shape, cutting fluids, process parameters (such as cutting speed, feed rate and depth of cut) and tool geometry and machine tool characteristics. The tool wear weight assesses real damage to the tool and is also based on blended wear of flank, crater, chip notching, primary and secondary grooving. This paper discusses the wear behavior of carbide tool utilizing response surface methodology. Machining tests were carried out by using EN-31 steel with tungsten carbide tools using soluble oil-water mixture lubricant under different machining variables. The study reveals that tool wear is mainly affected by cutting speed ,feed rate and tool nose radius whereas, depth of cut have negligible effect. However, response surface methodology combined with factorial design of experiments is a better alternative to the traditional one-variable- at –a-time approach for studying the effects of cutting variables on responses such as tool wear.
{"title":"Wear Behaviour of Carbide Tool During Machining of Steel","authors":"L. Abhang, M. Hameedullah","doi":"10.2139/ssrn.3332379","DOIUrl":"https://doi.org/10.2139/ssrn.3332379","url":null,"abstract":"Wear process takes predominant role in reducing the tool life during machining of steel. Tool wear is the progressive loss of material from the surface of the body of a tool. This occurs as a natural consequence when two surfaces with relative motion interact with each other. Challenges of wear mechanisms such as variation in chips, high pressure loads and spring back are responsible for tool wear. In addition the rate of tool wear depends on tool and work piece materials, tool shape, cutting fluids, process parameters (such as cutting speed, feed rate and depth of cut) and tool geometry and machine tool characteristics. The tool wear weight assesses real damage to the tool and is also based on blended wear of flank, crater, chip notching, primary and secondary grooving. This paper discusses the wear behavior of carbide tool utilizing response surface methodology. Machining tests were carried out by using EN-31 steel with tungsten carbide tools using soluble oil-water mixture lubricant under different machining variables. The study reveals that tool wear is mainly affected by cutting speed ,feed rate and tool nose radius whereas, depth of cut have negligible effect. However, response surface methodology combined with factorial design of experiments is a better alternative to the traditional one-variable- at –a-time approach for studying the effects of cutting variables on responses such as tool wear.","PeriodicalId":412391,"journal":{"name":"ChemRN: Materials Processing (Topic)","volume":"409 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124344439","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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