scholarly journals The Effect of Laser Parameters on Cutting Metallic Materials

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4596
Author(s):  
Seungik Son ◽  
Dongkyoung Lee

This experimental study investigated the effect of laser parameters on the machining of SS41 and SUS304. The metallic materials play an important role in engineering applications. They are widely used in high-tech industries such as aerospace, automotive, and architecture. Due to the development of technology and high-tech industrialization, the various processing technologies are being developed with the requirement of high precision. However, the conventional cutting process is difficult to meet high precision processing. Therefore, to achieve high precision processing of the SS41 and SUS304, laser manufacturing has been applied. The current study investigated the process quality of laser cutting for SS41 and SUS304, with the usage of a continuous wave CO2 laser cutting system. The experimental variables are set to the laser cutting speed, laser power, and different engineering materials. The results are significantly affected by the laser parameters. As the result, the process quality of the laser cutting has been observed by measuring the top and bottom kerf widths, as well as the size of the melting zone and Heat Affected Zone (HAZ) according to volume energy. In addition, the evaluation of the laser processing parameters is significantly important to achieve optimal cutting quality. Therefore, we observed the correlation between the laser parameters and cutting quality. These were evaluated by analysis of variance (ANOVA) and multiple regression analysis. The experimental results of kerf top, kerf bottom, melting width, and HAZ on the laser parameters are properly predicted by multiple regression. In addition, the effect of laser parameters on the materials is determinant by the percentage of contribution of ANOVA.

2020 ◽  
Author(s):  
Dongkyoung Lee

Abstract This experimental study investigated for the effect of laser parameters on machining of the SS41 and SUS304. These materials play an importance role in engineering aspect. They are widely used in high-tech industries such as aerospace, automotive, and semiconductor. Due to the development of technology and high-tech industrialization, the various processing technologies requiring high precision are being developed. However, the conventional cutting process is difficult to meet high precision processing. Therefore, to achieve high precision processing of the SS41 and SUS304, laser manufacturing has been applied. The experiment investigates the process quality of laser cutting for SS41 and SUS304, with the usage of a continuous wave CO2 laser cutting system. The experimental variables are set to the laser cutting speed, laser power, and different used materials. The results are significantly affected by the laser parameters. As the results, the process quality of the laser cutting has been observed by measuring the top and bottom kerf widths, as well as the size of the melting zone and HAZ according to Eline. In addition, the evaluation of the laser processing parameters is significantly important to achieve optimal cutting quality. Therefore, we observed the correlation between the laser parameters and cutting quality. These were evaluated by analysis of variance (ANOVA) and multiple regression analysis.


Internauka ◽  
2021 ◽  
Vol 182 (6) ◽  
Author(s):  
Viktor Anatolievich Shcheblanov ◽  
Andrey Andreevich Abramov ◽  
Vasily Sergeevich Shmelev

2015 ◽  
Vol 760 ◽  
pp. 475-481
Author(s):  
Cristina Biris ◽  
Octavian Bologa ◽  
Claudia Girjob ◽  
Sever Gabriel Racz

This paper presents the study of the influence of cutting parameters on surface quality in laser cutting of metallic materials. In this paper, it is shown which of the cutting parameters have the greatest influence on the quality of the processed surfaces by measuring various roughness parameters. After the experimental research was carried out a ranking of the factors of influence on the response functions was made, also graphs of dependency to various parameters of roughness were made.


Author(s):  
Lyubomir Lazov ◽  
Pavels Narica ◽  
Janis Valiniks ◽  
Antons Pacejs ◽  
Hristina Deneva ◽  
...  

By taking advantage of the best characteristics of wood, modern production methods can offer hard wearing and ecological solutions in industrial construction, house building, machinery construction, furniture manufacturing, transport and many other industries. Laser cutting process is an alternative choice to prepare the final shape of wood parts. Materials like wood have good laser light absorption of wavelength 10600 nm. In this paper a CO2 laser system with a maximum continuous-wave output power of 150 W is described and used in studying laser cutting process of wood materials. Cut depth is evaluated with variation of values of laser power and cutting speed. Additionally, optimal values of parameters for laser cutting of different wood plate thicknesses are determined and graphs are created showing the results.


Author(s):  
S-L Chen

The sheer number of non-linear interacting factors responsible for the performance of laser cutting makes it impractical, in general, to investigate all the factors by experimental method only. To understand further the essential phenomena of the oxidation reaction in reactive CO2 laser cutting, a mathematical model was created in this research to investigate the effects of cutting parameters on the cutting front edge dynamic behaviour. Understanding the effects of various parameters is important for improving the performance and quality of laser cutting. The reactive CO2 laser cutting of a thin metallic plate utilizing a continuous-wave laser beam having a Gaussian intensity distribution was considered in this study. Both the beam absorptivity and the heat generated at the cutting front edge during the reactive cutting process were considered in this research. The numerical results of this work can be used to predict or estimate the variations in the location, speed and acceleration of the cutting front edge, given various gas compositions, gas pressures, cutting speeds and beam absorptivities. An on-line monitoring system for laser cutting was built, and a series of experiments was performed to record the fluctuating frequency of the cutting front edge. The results confirm that our theoretical results were in accordance with the related experimental results.


2021 ◽  
Vol 3 (1) ◽  
pp. 1-7
Author(s):  
Leli Piska Yumame ◽  
Meinarni Asnawi ◽  
Rudiawie Larasati

This study aims to examine the effect of competence, independence, and experience on the auditquality of the inspectorate officials in Papua province. A common problem in this study is theexistence of audit findings that are not detected by the inspectorate apparatus as internal auditorsbut found by external auditors, the Supreme Audit Agency (BPK). Operationally, the researchvariables are elaborated into several indicators. The competency variables of the apparatus areelaborated into three indicators, namely mastery of accounting and auditing standards, insight intogovernment, and skills improvement programs. The variables of apparatus independence areelaborated into two indicators, namely personal disturbance and external interference. Theapparatus experience variable is elaborated into several indicators, namely: In terms of length ofwork as an auditor, and the number of audit tasks that have been carried out. The audit qualityvariable is elaborated into four indicators, namely: process quality, result quality, and follow-up onaudit results.The population of this study were officials from the Inspectorate of Jayapura City, Inspectorate, andPapua Province who also carried out regular inspections. Data were taken from questionnairesdistributed to respondents. The variables in this study are the independent variable (independent)competence (X1), independence (X2), and experience (X3), while the dependent variable(dependent) is the quality of the audit (Y). Data were analyzed using multiple linear regressionanalysis (multiple regression).The results showed that competence and experience had a positive and significant effect on auditquality, while the independence variable did not have a significant effect on audit quality. Thecoefficient of determination shows that together competence, independence, and experiencecontribute to the dependent variable (audit quality) by 55.1% while the remaining 44.9% isexplained by factors outside the model of this study.


2021 ◽  
pp. 7-20
Author(s):  
И.В. Каблашова ◽  
И.В. Логунова ◽  
К.С. Кривякин ◽  
В.Н. Родионова

Введение. В статье изложены результаты теоретического исследования научных подходов к разработке методологии управления качеством наукоемких процессов в условиях внедрения цифровых стандартов деятельности предприятия. Выявлено, что разработка и внедрение цифровых стандартов является современным решением, которое позволяет обеспечить полноценное использование информационных технологий при выработке и реализации стратегических и оперативных решений с целью постоянного улучшения качества процессов и совершенствования системы управления наукоемким предприятием. Данные изменения предопределяют необходимость переосмысления некоторых положений методологии управления качеством с учетом изменений в деятельности наукоемкого предприятия при внедрении цифровых стандартов. Данные и методы. Проведенные исследования показали, что система управления качеством процессов призвана обеспечивать сбалансированность всех этапов жизненного цикла разработки и реализации новой продукции с учетом требований к качеству входов и выходов, срокам осуществления и оптимальной загрузки всех компонентов производственной мощности наукоемкого предприятия. При исследовании использовались методы эмпирического и методологического анализа, статистические методы, данные научных и аналитических публикаций по рассматриваемой проблеме, ресурсы сети интернет. Полученные результаты. Проведен анализ методологии применения процессного подхода, рекомендованного международной системой менеджмента качества и стандартами ИСО. Обосновано, что в условиях внедрения цифровых стандартов должны быть построены интеграционные модели цепочек процессов, включающих операции, выполняемые структурными подразделениями, расположенными на разных уровнях организационной структуры управления наукоемким предприятием, сформированы новые условия осуществления взаимосвязанных процессов, что обусловливает необходимость разработки новых компетенций для персонала. Сделан вывод, что для эффективной реализации механизма управления качеством процессов необходимо четко идентифицировать ответственность персонала за качество каждого процесса, организовать постоянный мониторинг и диагностику текущих параметров процессов. Ответственность за организацию мониторинга следует идентифицировать линейным руководителям, а ответственность за своевременную корректировку процесса - на непосредственных исполнителей процессов. Предложен методический подход к обеспечению вовлеченности персонала в деятельность по проявлению цифровых инициатив для улучшения качества процессов, что позволит обеспечить повышение эффективности и производительности наукоемкого предприятия с учетом стратегических целей в области управления качеством. Заключение. Сформулированные решения по внедрению изменений в механизме управления качеством процессов при внедрении цифровых стандартов деятельности наукоемкого предприятия определяют необходимость разработки цифровой модели реализации процессов по этапам жизненного цикла создания новой продукции. При этом приоритетными вопросами являются изменение управления цепочками процессов и содержания трудовой деятельности персонала, что непосредственно влияет на эффективность работы наукоемкого предприятия. Introduction. The article presents the results of a theoretical study of scientific approaches to the development of a methodology for quality management of knowledge-intensive processes in the context of the introduction of digital standards of enterprise activity. It is revealed that the development and implementation of digital standards is a modern solution that allows for the full use of information technologies in the development and implementation of strategic and operational decisions in order to continuously improve the quality of processes and improve the management system of a knowledge-intensive enterprise. These changes determine the need to rethink some provisions of the quality management methodology, taking into account changes in the activities of a knowledge-intensive enterprise when implementing digital standards. Data and methods. The conducted research has shown that the process quality management system is designed to ensure a balance of all stages of the life cycle of the development and implementation of new products, taking into account the requirements for the quality of inputs and outputs, the timing of implementation and optimal utilization of all components of the production capacity of a high-tech enterprise. The research used methods of empirical and methodological analysis, statistical methods, data from scientific and analytical publications on the problem under consideration, and Internet resources. The results obtained. The methodology of the process approach application recommended by the international quality management system and ISO standards is analyzed. It is proved that in the conditions of digital standards implementation, integration models of process chains should be built, including operations performed by structural divisions located at different levels of the organizational structure of the management of a knowledge-intensive enterprise, new conditions for the implementation of interrelated processes should be formed, which makes it necessary to develop new competencies for personnel. It is concluded that for the effective implementation of the process quality management mechanism, it is necessary to clearly identify the responsibility of personnel for the quality of each process, to organize constant monitoring and diagnostics of the current process parameters. The responsibility for organizing monitoring should be identified to line managers, and the responsibility for timely process adjustments should be assigned to the direct executors of the processes. A methodological approach is proposed to ensure the involvement of personnel in the development of digital initiatives to improve the quality of processes, which will ensure an increase in the efficiency and productivity of a knowledge-intensive enterprise, taking into account the strategic goals in the field of quality management. Conclusion. The formulated decisions on the implementation of changes in the process quality management mechanism when implementing digital standards for the activities of a high-tech enterprise determine the need to develop a digital model for the implementation of processes at the stages of the life cycle of creating new products. At the same time, the priority issues are changing the management of the process chains and the content of the staff's work, which directly affects the efficiency of the knowledge-intensive enterprise.


2019 ◽  
Vol 5 (1) ◽  
pp. 18-30
Author(s):  
Sukma Perdana ◽  
Rosyid Arifin

The purpose of this study was to determine the effect of fairness and tax knowledge on compliance of individual taxpayers in Malang. The analytical method used in this study is multiple regression. Based on the results of the analysis found evidence that simultaneously or partially justice and tax knowledge affect the compliance of Individual Taxpayers in Malang. In order to improve taxpayer compliance, the KPP Pratama office in Malang provides taxation knowledge to the public through intensive, consistent and sustainable tax education. In addition, it is necessary to increase the quantity and quality of tax education counseling so that the public's tax knowledge increases and become more aware and compliant in carrying out their tax obligations. In addition, taxpayers to learn more and understand the regulations regarding taxation so that they can improve their compliance as taxpayers Keywords: Justice, tax knowledge and taxpayer compliance


AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025038
Author(s):  
Lang Bai ◽  
Gang Zheng ◽  
Bin Sun ◽  
Xiongxing Zhang ◽  
Qiming Sheng ◽  
...  

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