Special Issue on Active and Passive Vibration Damping in Machine Tools

2018 ◽  
Vol 12 (5) ◽  
pp. 621-621
Author(s):  
Michael F. Zaeh
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Low Cost ◽  
Stable State ◽  
Depth Of Cut ◽  
Special Issue ◽  
Passive Damping ◽  
Illustrated Manuscripts ◽  
Chatter Vibrations

Automation of machine tools has made them more productive, thereby providing an advantage for sustainability and the welfare of mankind. However, in many cases, the successful automation of machine tools requires the avoidance of self-excited chatter vibrations, resulting in a reliable stable state for cutting. Machine tool operators tend to use the machines close to their power thresholds, thereby unknowingly driving them toward the limits of their stability. Much progress has been made in the last few decades concerning the understanding and prediction of such vibrations, and this has led to improvements such as higher cutting rates and chip thicknesses. Several countermeasures such as active and passive damping are available for avoiding chatter vibrations in machine tools. However, their industrial use is not common yet. In fact, the industry is somewhat unfamiliar with many of these countermeasures. The hesitant attitude of the machine tool builders to apply such countermeasures is a result of several factors: active and passive damping devices are additional system components that require design, tuning, and maintenance. Furthermore, they are associated with a risk of failure, resulting in additional down times of the machines. Additionally, if a machine requires such devices to achieve the desired specifications, the customer’s opinion regarding it can be negatively affected. This situation is challenging for machine tool builders, users, and academia as well. Therefore, we decided to dedicate a special issue of IJAT to this topic. This special issue focuses on both active and passive damping measures, particularly the measures that are systematically designed and deliberately implemented to increase the chatter-free depth of cut in machine tools. The papers in this issue identify successful applications or at least a vision for them. Additionally, models demonstrating the effects of the chosen active or passive damping systems are presented. Some of these models can also be used to systematically select the parameters of the system. Some of the systems can be easily applied as low-cost patch-up solutions to improve the behaviors of the machines already in use. I hope that this special issue delivers a valuable overview of the existing approaches to introduce additional damping in machine tools. I would like to sincerely thank all the authors for their dedication and the well written and illustrated manuscripts. I would also like to thank the reviewers for their efforts to ensure the quality of this issue. Finally, I am very thankful to IJAT for their immense cooperation and support. I wish you all the best and hope that you can benefit from the content of this special issue.

scholarly journals Internet of Things (IoT) Operating Systems Management: Opportunities, Challenges, and Solution

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1793 ◽  
Author(s):  
Yousaf Bin Zikria ◽  
Sung Won Kim ◽  
Oliver Hahm ◽  
Muhammad Khalil Afzal ◽  
Mohammed Y. Aalsalem
Keyword(s):  
Internet Of Things ◽  
Low Cost ◽  
Future Research ◽  
Technological Innovations ◽  
Special Issue ◽  
Research Directions ◽  
Key Factor ◽  
Future Research Directions ◽  
Standard Set

Internet of Things (IoT) is rapidly growing and contributing drastically to improve the quality of life. Immense technological innovations and growth is a key factor in IoT advancements. Readily available low cost IoT hardware is essential for continuous adaptation of IoT. Advancements in IoT Operating System (OS) to support these newly developed IoT hardware along with the recent standards and techniques for all the communication layers are the way forward. The variety of IoT OS availability demands to support interoperability that requires to follow standard set of rules for development and protocol functionalities to support heterogeneous deployment scenarios. IoT requires to be intelligent to self-adapt according to the network conditions. In this paper, we present brief overview of different IoT OSs, supported hardware, and future research directions. Therein, we provide overview of the accepted papers in our Special Issue on IoT OS management: opportunities, challenges, and solution. Finally, we conclude the manuscript.

Simulation-Based Dimensioning of the Required Actuator Force for Active Vibration Control

2018 ◽  
Vol 12 (5) ◽  
pp. 658-668 ◽  
Author(s):  
Robin Kleinwort ◽  
◽  
Philipp Weishaupt ◽  
Michael F. Zaeh
Keyword(s):  
Machine Tool ◽  
Vibration Control ◽  
Machine Tools ◽  
Active Vibration Control ◽  
Depth Of Cut ◽  
Force Model ◽  
Machining Processes ◽  
Simulation Based ◽  
Active Vibration ◽  
The Right

The material removal rates of machine tools are often limited by chatter, which is caused by the machine’s most flexible structural modes. Active vibration control systems mitigate chatter vibrations and increase the chatter-free depth of cut. The systems can be used for already-in-use machine tools in particular as a retrofit solution. Unfortunately, no dimensioning techniques exist to help in finding the right actuator size required for a specific machine tool. This publication presents a simulation-based dimensioning methodology that determines, based on a stability analysis, the required actuator force and bandwidth. First, the critical machining processes, based on machine tool specific parameters, are identified. Then, the required actuator force and bandwidth are determined with the help of a coupled simulation model that consists of a cutting force model, the machine’s structural dynamics, and a model of the active vibration control system.

scholarly journals Special Issue on Green Manufacturing and Supply Chain

2012 ◽  
Vol 6 (3) ◽  
pp. 251-251
Author(s):  
Masaru Nakano ◽  
Nobuhiro Sugimura
Keyword(s):  
Supply Chain ◽  
Machine Tool ◽  
Supply Chains ◽  
Environmental Sustainability ◽  
Machine Tools ◽  
Success Factors ◽  
Green Manufacturing ◽  
Tool Geometry ◽  
Sustainable Supply Chain ◽  
Special Issue

With machine tools evolving with the hardware and control whose dramatic advances are expanding the field, requirements for performance have grown tougher. These have made it more complicated to design, produce, and maintain machine tool systems. This has also ensured that performance evaluation and prediction technology play an increasingly important and active role in these areas. Green manufacturing technology (GM) and green supply chain management (GrSCM) are becoming increasingly important as awareness of global warming, energy security, pollution, metal shortages, etc., grow. Although sustainability has economic and social dimensions, the objective of GMand GrSCM is to enhance environmental sustainability. IJAT published a special issue on Design and Manufacturing Toward Sustainability in January 2009. Global manufacturing networks and eco-city projects are increasingly widespread. This special issue therefore includes GrSCM, and eco-business issues, together with GM and green-product design. The focus here is on opening a scientific discussion on these topics through considering which challenges should be addressed. This special issue covers the following proposals: 1. Key success factors and eco-business methodology 2. Efficient scheduling algorithms for production, logistics, and projects as economic improvement becomes more environmentally friendly 3. Simulation for analyzing supply chain robustness 4. Surveys summarizing conventional studies related to green supply chains Since the proposed topics in this special issue are somewhat limited, we encourage you to new promising topics. Most conventional GrSCM and sustainable supply-chain studies, for example, cover only concepts and surveys. Efficient algorithms for logistics in factories or supply chains are not new to the academic field. We encourage young researchers to move away from already mined areas to more challenging subjects. Another example is the socio-technical approach which needs various research fields such as economics, business, policy, and life-cycle assessment because stakeholders include governments, people and enterprises. We would like to express our sincere appreciation to the authors for their submissions and to the reviewers for their invaluable efforts. Without these, this special issue could not have been published. This special issue on machine tool evaluation should prove especially interesting to researchers and engineers engaged in the enhancement of accuracy, efficiency, and versatility in machine tool systems, including the important disciplines of tooling and cutting tools. The topics that are covered in this special issue include – but are not limited to – the metrology of machine tools, the identification of kinematic errors through machine tool geometry, the evaluation of thermal deformation, the dynamic analysis of machine tools, the evaluation of spindle stiffness, and cutting-edge monitoring technology. All of these provide advanced knowledge concerning that state-of-the-art of technology required to ensure that machine tool design continues to remain innovative. I would like to close here by expressing my sincere appreciation to all those who have worked to make this issue interesting and informative. My special thanks go to the authors of the featured articles and to the reviewers whose invaluable efforts have made this publication possible.

scholarly journals Special Issue on the Latest Machine Tool Technologies and Manufacturing Processes

2019 ◽  
Vol 13 (5) ◽  
pp. 573-573 ◽  
Author(s):  
Yohichi Nakao ◽  
Hayato Yoshioka
Keyword(s):  
Internet Of Things ◽  
Machine Tool ◽  
Machine Tools ◽  
Manufacturing Systems ◽  
Tool Path ◽  
Industrie 4.0 ◽  
Smart Manufacturing ◽  
Manufacturing Processes ◽  
Special Issue ◽  
Excellent Research

With the 2011 launch of Industrie 4.0, a German project aiming to promote the computerization of manufacturing, the integration of physical or actual manufacturing systems with cyber-physical systems (CPS) using various technologies, such as the Internet of things (IoT), industrial Internet of things (IIOT), and artificial intelligence, is considered to be more important than ever before. One of the goals of the Industrie 4.0 is to realize smart factories or smart manufacturing using advanced digital technologies. However, the core component in the manufacturing systems is still machine tools. This special issue, composed of eleven excellent research papers, focuses on the latest research advances in machine tools and manufacturing processes. It covers various topics, including machine tool control, tool path generation for multi-axis machining, and machine tool components. Furthermore, this special issue includes innovative machining technologies, including not only cutting and grinding processes but also the EDM process and burnishing process connected effectively with force control techniques. All the research contributions were presented at IMEC2018, a joint event with JIMTOF2018, held in Tokyo, Japan in 2018. The editors would like to sincerely thank the authors for their dedication and for their well written and illustrated manuscripts. We are also profoundly grateful for the efforts of all the reviewers who ensured their quality. Finally, we sincerely hope that studies on machine tools and related manufacturing technologies will further contribute to the development of our global society.

scholarly journals An approach of developing low cost ARM based CNC systems by controlling CAN drives

2018 ◽  
Vol 224 ◽  
pp. 01020 ◽  
Author(s):  
Georgi M. Martinov ◽  
Akram Al Khoury ◽  
Ahed Issa
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
Low Cost ◽  
Cnc Machine Tools ◽  
Application Layer ◽  
Cnc Machine ◽  
Servo Drive ◽  
Wide Range ◽  
Quality Of Products

Nowadays, there is a big demand on using small sized CNC machine tools, which have low price tag, wide range of implementations, low manufacturing costs and can be used for educational purposes. These machines can achieve casual manufacturing routines, like milling and drilling in applications, where there is no need for high speed performances and super quality of products. In this work, we proposed a model of CNC for these machines and analysed its components and efficiency. The model consists of three main layers: CNC system (application layer), ARM based microcomputer as CAN master and controller (connecting layer) and Servo-Drive Step Motors (actuating layer).

Automatische HiLS-Generierung für komplexe Maschinen*/Automated creation of HiLS of complex machine tools

2016 ◽  
Vol 106 (07-08) ◽  
pp. 501-505
Author(s):  
S. Scheifele ◽  
A. Prof. Verl
Keyword(s):  
Machine Tool ◽  
Control Systems ◽  
Software Quality ◽  
Machine Tools ◽  
Hardware In The Loop ◽  
Automated Generation ◽  
Quality Of Control

Die Hardware-in-the-Loop-Simulation (HiLS) von Maschinen und Anlagen wird eingesetzt, um die Zeiten zur Herstellung einer Maschine zu verkürzen und die Softwarequalität der Steuerung zu erhöhen. Inzwischen spielt sie auch bei der Projektierung und der Konzeptüberprüfung eine immer größere Rolle. Der Fachbeitrag zeigt auf, mit welchen Methoden der Modellierung wiederverwendbare Modelle geschaffen und so automatisch HiLS generiert werden können.   The hardware-in-the-loop simulation (HiLS) of machinery and equipment is used to reduce the time needed for producing a machine tool and to enhance the software quality of control systems. Today HiLS also plays an important role for commissioning machine tools and for the concept verification. This paper points out which methods can be used for the modeling of reusable models and, thus, how an automated generation of a HiLS can be realized.

Mini Special Issue on Machining Control and Process Monitoring

2014 ◽  
Vol 8 (6) ◽  
pp. 791-791
Author(s):  
Tojiro Aoyama
Keyword(s):  
Machine Tool ◽  
Process Monitoring ◽  
Machine Tools ◽  
Cutting Tools ◽  
Machining Process ◽  
Machining Accuracy ◽  
Special Issue ◽  
Practical Proposal ◽  
Machining Control ◽  
Novel Approaches

Control and process monitoring are key technologies supporting high machining accuracy and efficiency. This special issue features six papers taking novel approaches to controlling machine and cutting tools and monitoring the machining process. The motion control of machine tools and cutting tools are introduced. A new challenge for monitoring the machining process by referring to NC control servo signals implements a practical proposal. The precise identification of friction at driving elements of machine tool components is an important factor in improving machine tool control motion accuracy. I would like to express my sincere appreciation to the authors and reviewers whose invaluable efforts have helped make the publication of this manuscript possible.

Methods to Design the Adjustment of Parameters for Thermal Machine-Tool Models

2014 ◽  
Vol 1018 ◽  
pp. 403-410 ◽  
Author(s):  
Bernd Kauschinger ◽  
Steffen Schroeder
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Low Cost ◽  
Measurement Equipment ◽  
Planning Stage ◽  
Thermal Models ◽  
Adjustment Procedure ◽  
Model Adjustment ◽  
High Degree ◽  
Adjustment Of Parameters

Thermal models of machine tools contain parameters whose values have a high degree of uncertainty and which can limit the accuracy of the model beyond applicability. Thus, the parameters have to be adjusted by means of measurements. At present, substantial time, effort, and expensive measurement equipment are required for adjustment, as well as in-depth expertise. For these reasons, we have studied the development of methods providing rapid, comprehensive, and low-cost adjustment. This objective can especially be achieved by methods that support the planning stage of the model-adjustment procedure. The paper demonstrates this based on methods for model and behaviour visualisation.

scholarly journals Spindle Error Movements and Their Measurement

2021 ◽  
Vol 11 (10) ◽  
pp. 4571
Author(s):  
Jarosław Chrzanowski ◽  
Tadeusz Sałaciński ◽  
Paweł Skiba
Keyword(s):  
Machine Tool ◽  
Research Methods ◽  
Machine Tools ◽  
Research Work ◽  
Current State ◽  
Cutting Machine ◽  
The Impact

The spindle of a machine tool is an important component of the machine. Its condition affects not only operation of the machine tool but also, above all, the quality of the workpiece. This paper explains the terminology and describes the research methods used to measure the spindle error movements of cutting machine tools. This article explains the impact of spindle motion inaccuracies on the quality of workpieces, quotes the requirements of European and American standards, and describes the current state and directions of development of the presented methods. Our own research work in this field is also presented.

Improvements to Linear and Nonlinear Models of Machine Key Components

Impact ◽  
2021 ◽  
Vol 2021 (1) ◽  
pp. 15-17
Author(s):  
Yum Ji Chan
Keyword(s):  
Machine Tool ◽  
Virtual Machine ◽  
Structural Dynamics ◽  
Machine Tools ◽  
Dynamic Behaviour ◽  
Nonlinear Models ◽  
Wear And Tear ◽  
Linear And Nonlinear ◽  
Do So

Precision machinery has come a long way over the years. Factories that once relied on manpower now use machines, and this development has brought with it innumerable benefits including improvements to accuracy, repeatability, productivity and efficiency. Naturally, though, machines are imperfect in that precision of a batch of machines vary slightly. On top of that, machines experience wear and tear or even break-downs. These unpredictable events can be costly to manufacturers. This is why research to better understand factors that affect a machine's precision is important. This knowledge can be used to reduce the issues that occur with machine tools and thereby maximise the efficiency and quality of production. This is the goal of Dr Yum-Ji Chan, Department of Mechanical Engineering, National Chung Hsing University, Taiwan. His research on vibration engineering, structural dynamics and the dynamics of rotors is seeking to better understand machine tools and, in doing so, improve their performance. He believes more research is required to understand the behaviour of specific components in machine tools, and he is seeking to fill this gap in knowledge. This involves understanding the vibration phenomena that occur in components in machine tools and, to do so, Chan and his team are producing accurate dynamic behaviour in machine tool models. This will, in turn, enable researchers to develop virtual machine tools that can monitor the condition of machines.

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