Laser Modification of Metal Cutting Tool: Assessment of the Influence on Wear Resistance and Quality of the Processed Surface

2020 ◽  
Vol 836 ◽  
pp. 118-123
Author(s):  
S.K. Kargapol’tsev ◽  
V.I. Shastin ◽  
V.E. Gozbenko
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Experimental Studies ◽  
Machined Surface ◽  
Laser Modification ◽  
Metal Cutting Tool ◽  
The Impact

The paper reflects the relevance of hardening the working surfaces of the tool, where the surface layer plays a fundamental role. The main factors determining the wear resistance of the tool and their influence on the quality of the processed surface are analyzed. The purpose of the research is to study the effect of laser modification of tool alloys on wear resistance and on the roughness parameters of the machined surface. A small-sized drill bit (steel P6M5) and carbide inserts T15K6 are used as objects of research. The paper presents the results of experimental studies on the impact of laser radiation on the microstructure of materials, indices of wear resistance and quality parameters of the treated surface. It is established that there is a certain relationship between these indices. The modes of laser modification of the tool most acceptable for practical use are determined. Along with an increase in the wear resistance of a metal-cutting tool, a manifestation of the effect of an increase in surface roughness indices is found and experimentally confirmed. It is established that hardening of the surface layer is caused by structural and phase transformations with enhanced physical and mechanical properties, and the roughness indices depend on the degree of dispersion (amorphization) of the modified layer.

scholarly journals Processing of critical parts of marine vessels and structures by metal cutting tools

2021 ◽  
pp. 13-17
Author(s):  
Б.Я. Мокрицкий ◽  
В.М. Давыдов
Keyword(s):  
Service Life ◽  
Tool Life ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Software Environment ◽  
Machined Surface ◽  
Metal Cutting Tool ◽  
Marine Vessels

Актуальность. Изложены результаты совершенствования токарной обработки заготовок ответственных деталей морских судов, особенно подводных, и сооружений, подвергаемых в процессе эксплуатации агрессивному воздействию морской воды, например, валопроводов судов. Такие детали, как правило, выполняются из специализированных труднообрабатываемых нержавеющих сталей. Специфические свойства таких сталей создают серьёзные сложности при их обработке лезвийным металлорежущим инструментом. Например, период стойкости типового токарного резца отечественных или зарубежных изготовителей не превышает 40 минут. Это не приемлемо для сегодняшнего уровня высокопроизводительной обработки. Целью работы является повышение эффективности токарной обработки таких сталей. Решение этой задачи достигнуто за счёт разработки новых покрытий для таких режущих пластин. Методы исследования. Для разработки использовано имитационное моделирование как метод исследования. Оно выполнено в программной среде Deform. Она адаптирована под решаемую задачу. Результаты. Разработан металлорежущий инструмент с покрытиями, обеспечивающий повышение периода стойкости в 2 и более раз. Вывод. Поставленная цель достигнута. Обеспечено повышение периода стойкости металлорежущего инструмента в 2 и более раз без снижения производительности обработки и с повышением качества поверхности обработанной заготовки детали. The relevance of the research is due to the fact, that a number of parts of marine vessels and structures must be made of corrosion-resistant steels. These are specialized stainless steels. They have a lot of chrome and nickel. It makes difficult to process blanks of details by metal-cutting tools. Its durability period is insufficient. The aim of the research is to increase the efficiency of turning such steels. Efficiency here means an increasing of the service life of a metal-cutting tool without decreasing of the processing performance and the quality of the machined surface of the detail. The software environment Deform was used as a method of the simulation research. Initial and output criterias have been developed for it. For this purpose, the software environment is adapted to the solving problem. As input parameters, the architecture of the coating is set, when applied to the hard-alloy material, an increase of the tool life is expected. The following results were obtained. Coatings for turning tools, providing the increase of the tool life to 2 or more times, were designed. The output. The setted goal has been achieved. The service life of the metal-cutting tool is increased to 2 or more times without decreasing of the processing performance and with an increase of the surface quality of the processed details.

scholarly journals Selected Properties of the Surface Layer of C45 Steel Parts Subjected to Laser Cutting and Ball Burnishing

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3429 ◽  
Author(s):  
Agnieszka Skoczylas ◽  
Kazimierz Zaleski
Keyword(s):  
Surface Layer ◽  
Residual Stresses ◽  
Laser Cutting ◽  
Experimental Studies ◽  
Hardened Layer ◽  
Ball Burnishing ◽  
Absolute Value ◽  
The Impact ◽  
Compressive Residual Stresses

In this article, we report the results of experimental studies on the impact of ball burnishing parameters on the roughness, microstructure and microhardness of the surface layer of laser-cut C45 steel parts. We also analysed the distribution of residual stresses generated in the surface layer of these parts. Laser-cut parts often require finishing to improve the quality of their surface. The tests performed in this study were aimed at assessing whether ball burnishing could be used as a finishing operation for parts of this type. Ball burnishing tests were performed on an FV-580a vertical machining centre using a mechanically controlled burnishing tool. The following parameters were varied during the ball burnishing tests: burnishing force Fn, path interval fw and the diameter of the burnishing ball dn. Ball burnishing of laser-cut C45 steel parts reduced the surface roughness parameters Sa and Sz by up to 60% in relation to the values obtained after laser cutting. Finish machining also led to the reorganization of the geometric structure of the surface, resulting in an increase in the absolute value of skewness Ssk. This was accompanied by an increment in microhardness (maximum microhardness increment was ΔHV = 95 HV0.05, and the thickness of the hardened layer was gh = 40 µm) and formation of compressive residual stresses in the surface layer.

The use of assembled cutting tool with damping elements to reduce mechanical vibrations

2021 ◽  
Author(s):  
Keyword(s):  
High Speed ◽  
Metal Cutting ◽  
Cutting Tool ◽  
End Mill ◽  
Mechanical Vibrations ◽  
Machined Surface ◽  
High Speed Cutting ◽  
End Mills ◽  
Cutting Modes

Aspects of vibration reduction during machining on metal-cutting machines to improve the quality of machined surfaces at moderate and high-speed cutting modes are considered. End mills with damping elements made of different materials, which provide the control of tool rigidity, are developed. Keywords: vibrations, end mill, vibrations, machined surface, damping. [email protected]

Method of Evaluation of Quality of Metal-Cutting Tool

2013 ◽  
Vol 379 ◽  
pp. 49-55 ◽  
Author(s):  
M.S. Ostapenko ◽  
D.S. Vasilega
Keyword(s):  
Metal Cutting ◽  
Cutting Tool ◽  
Technical Performance ◽  
Metal Cutting Tool ◽  
Method Of Evaluation

The method of estimation of quality of metal-cutting tool is developed. They determined consumer requirements, factors of use conditions, technical performance. They showed, that the temperature of cutting is the factor which connects al important features. The model of quality of collapsible lathe tools is created on the basis of it.

scholarly journals Modeling of Non-Stationary Processes When Cutting Hard-to-Process Materials

2021 ◽  
Vol 248 ◽  
pp. 04018
Author(s):  
Sergey Grigoriev ◽  
Mars Migranov ◽  
Abdumalik Seitkulov
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Metal Cutting ◽  
Production Efficiency ◽  
Cutting Tool ◽  
Experimental Studies ◽  
Increase Production Efficiency ◽  
Longitudinal Length ◽  
Blade Cutting ◽  
Cutting Modes

In the conditions of high-speed processing of parts of complex configuration, with a large end and longitudinal length, from hard-to-work steels and alloys, it is difficult to ensure the wear resistance of the cutting tool in the aisles of one technological passage. To ensure the appropriate quality indicators of the surface layer, it is impossible to replace a worn-out cutting tool. In connection with the above, the problem of ensuring the operability (wear resistance) of the cutting tool is acute. The results of theoretical and experimental studies of contact phenomena in blade cutting based on the thermodynamics of non – equilibrium processes and from the standpoint of self-organization of the tribosystem are presented. the developed thermodynamic model of blade processing with variable cutting modes (non-stationary) allows to minimize the wear of the cutting tool and generally increase production efficiency by accelerating the drive of the main movement of the metal-cutting machine.

scholarly journals PROSPECTS FOR THE USE OF VIBRATION DURING CUTTING MATERIAL

2021 ◽  
pp. 100-110
Author(s):  
Oleg Omelyanov ◽  
Yurii Polievoda ◽  
Mykhailo Zamriі
Keyword(s):  
Metal Cutting ◽  
Cutting Tool ◽  
Research Work ◽  
Low Frequency ◽  
High Strength ◽  
Scientific Work ◽  
Cutting Zone ◽  
Metal Cutting Tool ◽  
Efficient Power

Vibration is considered one of the effective ways to sharpen billets from difficult materials. The rational purpose of cutting modes with such a process allows you to increase the resistance of the metal-cutting tool, contributes to the creation of conditions to ensure constant crushing of chips. When cutting materials on the lathes of a turning group with the imposition of oscillations to the cutting tool, processes occur in the cutting zone, which differ from the processes arising from sharpening without oscillations. The article discusses the possibilities of using vibration oscillations when cutting materials. Currently, new materials that have high strength characteristics, viscosity and plasticity are widely used in mechanical engineering, with an increase in the processability: cutting force increases and efficient power spent on cutting; The quality of surface roughness is worsen; the resistance of the cutting tool is reduced; The amount of heat formed in the cutting zone increases and the character of its distribution on the surfaces of the workpiece and the tool changes; the process of forming chips, its shrinkage and type; The intensity of the process of formation of outflow and its form. In this regard, the question arises about the search for rational processing methods, in particular, mechanical processing with cutting on lathes. In this scientific work, the use of low-frequency oscillations is substantiated, which is the complex vibrational effect on the cutting process with the enforcement of solid chips, removal from the top of the cutter and preventing its formation, while ensuring the presence of a given roughness of the treated surface and an increase in the cutter resistance period. Research work in this direction is relevant and requires further research.

Study on the Influence of Silicone-Based Magnetorheological Elastomer on Tool Vibration During Turning of Hardened SS410 Steel

2021 ◽  
pp. 1-18
Author(s):  
X. Ajay Vasanth ◽  
P. Sam Paul ◽  
G. Lawrance
Keyword(s):  
Metal Cutting ◽  
Cutting Tool ◽  
Iron Particles ◽  
Magnetorheological Elastomer ◽  
Tool Vibration ◽  
Significant Parameter ◽  
Force Increase ◽  
Metal Cutting Tool ◽  
Cutting Experiments

In metal cutting, tool vibration is a significant parameter, which results in high cutting force, increase in tool wear and poor surface quality of the finished product. To control tool vibration, an innovative and a robust damper was required. In this regard, a magnetorheological elastomer was fabricated, and the effect of parameters like the ratio of iron particles to elastomer; plunger shape and intensity of current were studied. Cutting experiments were conducted to arrive at an optimum set of parameters, which can suppress tool vibration during turning of hardened SS410 steel. From the experimental results, it was observed that the use of magnetorheological elastomer has reduced the tool vibration by 60% and also improved the cutting performance significantly.

INCREASING THE WEAR RESISTANCE OF THE CUTTING TOOL

2020 ◽  
pp. 5-12
Author(s):  
M.Sh. MIGRANOV ◽  
◽  
A.M. MIGRANOV ◽  
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Cutting Tool

Results of research of increase of wear resistance of the tool by geometrical adaptation of the form of the cutting wedge at machining by cutting and milling of various materials on machinability, are given. The possibility of increasing the wear resistance of the cutting tool by 75…90 % while ensuring and improving the quality of the treated surface layer is confirmed.

Dynamics of the processes in metal machining

1998 ◽  
Vol 2 ◽  
pp. 115-122
Author(s):  
Donatas Švitra ◽  
Jolanta Janutėnienė
Keyword(s):  
High Frequency ◽  
Machine Tools ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Low Frequency ◽  
Metal Cutting Machine ◽  
Cutting Machine ◽  
Metal Machining

In the practice of processing of metals by cutting it is necessary to overcome the vibration of the cutting tool, the processed detail and units of the machine tool. These vibrations in many cases are an obstacle to increase the productivity and quality of treatment of details on metal-cutting machine tools. Vibration at cutting of metals is a very diverse phenomenon due to both it’s nature and the form of oscillatory motion. The most general classification of vibrations at cutting is a division them into forced vibration and autovibrations. The most difficult to remove and poorly investigated are the autovibrations, i.e. vibrations arising at the absence of external periodic forces. The autovibrations, stipulated by the process of cutting on metalcutting machine are of two types: the low-frequency autovibrations and high-frequency autovibrations. When the low-frequency autovibration there appear, the cutting process ought to be terminated and the cause of the vibrations eliminated. Otherwise, there is a danger of a break of both machine and tool. In the case of high-frequency vibration the machine operates apparently quiently, but the processed surface feature small-sized roughness. The frequency of autovibrations can reach 5000 Hz and more.

scholarly journals Impact of eating disorders on paid or unpaid work participation and performance: a systematic review and meta-analysis protocol

2022 ◽  
Vol 10 (1) ◽  
Author(s):  
Fatima Safi ◽  
Anna M. Aniserowicz ◽  
Heather Colquhoun ◽  
Jill Stier ◽  
Behdin Nowrouzi-Kia
Keyword(s):  
Systematic Review ◽  
Eating Disorders ◽  
Meta Analysis ◽  
Experimental Studies ◽  
Work Participation ◽  
Unpaid Work ◽  
Cochrane Library ◽  
And Performance ◽  
The Impact

Abstract Background Eating disorders (ED) can reduce quality of life by limiting participation and performance in social and occupational roles, including paid or unpaid work. The association between ED pathologies and work participation and performance must be well understood to strengthen vocational rehabilitation programmes and prevent occupational disruptions in the ED population. The aims of this study are: (1) to examine the degree of association between ED pathologies and work participation and performance in 15-year-olds and older; (2) to highlight the specific ED symptoms that are most correlated with changes in work performance and participation; (3) to compile the most common metrics and assessments used to measure work participation and performance with ED. Methods Medline, Embase, CINAHL, Web of Science, PsycINFO, and Cochrane Library will be searched for observational and experimental studies that meet the following criteria: (1) a clinical sample of typical or atypical ED; (2) paid or unpaid employment or training; (3) an association between ED pathologies and work participation or performance. Unpublished data will also be examined. Title and abstract, and full-text screening will be conducted in duplicate. Risk of bias and quality of evidence assessments will be completed. A random-effect meta-analysis will be performed. Discussion This synthesis can clarify knowledge and gaps around the impact of ED on work functioning, thereby allowing better evaluation, improvements and development of current workplace assessments, interventions, and policies. Trial registration The registration number for this systematic review on PROSPERO is CRD42021255055.

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