The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Christian Brecher - One of the best experts on this subject based on the ideXlab platform.
-
Materials in Machine Tool structures
CIRP Annals - Manufacturing Technology, 2015Co-Authors: Hans Christian Möhring, Jürgen Fleischer, Christian Brecher, Eberhard Abele, Friedrich BleicherAbstract:A broad variety of materials can be found in modern Machine Tool structures ranging from steel and cast iron to fiber reinforced composite materials. In addition, material combinations and hybrid structures are available. Furthermore, innovative intelligent and smart materials which incorporate sensor and actuator functionality enable the realization of function integrated structures. Consequently, material design and application discloses manifold degrees of freedom regarding a sophisticated layout and optimization of Machine frames and components. This keynote paper presents the current state-of-the-art with respect to materials applied in Machine Tool structures and reviews the correspondent scientific literature. Thus, it gives an overview and insight regarding material selection and exploitation for high performance, high precision and high efficiency Machine Tools.
-
Machine Tool feed drives
CIRP Annals - Manufacturing Technology, 2011Co-Authors: Yusuf Altintas, L Uriarte, Christian Brecher, Alexander Verl, Gunter PritschowAbstract:This paper reviews the design and control of feed drive systems used in Machine Tools. Machine Tool guides designed using friction, rolling element, hydrostatic and magnetic levitation principles are reviewed. Mechanical drives based on ball-screw and linear motors are presented along with their compliance models. The electrical motors and sensors used in powering and measuring the motion are discussed. The control of both rigid and flexible drive systems is presented along with active damping strategies. Virtual modeling of feed drives is discussed. The paper presents the engineering principles and current challenges in the design, analysis and control of feed drives. ?? 2011 CIRP.
-
Machine Tool spindle units
CIRP Annals - Manufacturing Technology, 2010Co-Authors: Eberhard Abele, Yusuf Altintas, Christian BrecherAbstract:This paper presents the state-of-the-art in Machine Tool main spindle units with focus on motorized spindle units for high speed and high performance cutting. Detailed information is given about the main components of spindle units regarding historical development, recent challenges and future trends. An overview of recent research projects in spindle development is given. Advanced methods of modeling the thermal and dynamical behavior of spindle units are shown in overview with specific results. Furthermore concepts for sensor and actuator integration are presented which all focus on increasing productivity and reliability. ?? 2010 CIRP.
-
Interaction of manufacturing process and Machine Tool
CIRP Annals - Manufacturing Technology, 2009Co-Authors: Christian Brecher, Monika Esser, Stephanie WittAbstract:Analysing the Machine Tool and the machining process individually is necessary in order to tackle the challenges that both have to offer. Nevertheless, to fully understand the manufacturing system, e.g. vibrations, deflections or thermal deformations, the interactions between the manufacturing process and the Machine Tool also have to be analysed. In cutting, grinding and forming there are important effects that can only be explained through these interaction phenomena. This paper presents the current state of research in process-Machine interactions for a wide variety of manufacturing processes. It is based on the findings of the CIRP research group "Process Machine Interaction (PMI)" and on the international publications in this field. Cutting with defined and undefined cutting edges as well as sheet and bulk metal forming are the key processes. The emphasis is on understanding, modelling and simulating all modes of interaction. Additional needs of research in process-Machine interaction are identified for future projects. © 2009 CIRP.
-
Virtual Machine Tool
CIRP Annals - Manufacturing Technology, 2005Co-Authors: Yusuf Altintas, Christian Brecher, Marcus Weck, Stephanie WittAbstract:This paper presents current state of Virtual Machine Tool Technology and related ongoing research challenges. The structural analysis of Machine Tools using Finite Element models and their experimental calibration techniques are presented. The kinematic analysis and optimisation of Machine Tool elements are discussed with sample examples. The interaction between the control of the feed drives, cutting conditions and Machine Tool structure is presented. Multi-body dynamic models of the Machine, which allow integrated simulation of Machine kinematics, structural dynamics and control techniques, are discussed. The interaction between the Machine Tool, controller and cutting process disturbances are discussed with sample examples. The simulation of machining operation and its impact on the dynamics of the Machine Tool and CNC are elaborated. The paper presents both the summary of current and past research, as well as research challenges in order to realise a fully digitised model of the Machine Tool.
Yusuf Altintas - One of the best experts on this subject based on the ideXlab platform.
-
manufacturing automation Machine Tool vibrations
2012Co-Authors: Yusuf AltintasAbstract:INTRODUCTION Machine Tools experience both forced and self-excited vibrations during machining operations. The cutting forces can be periodic, as in the case of milling. The nonsymmetric teeth in drilling, unbalance, or shaft runout in turning and boring can also produce periodically varying cutting forces. In all cases, the cutting forces can be periodic at tooth- or spindle-passing frequencies, which may have strong harmonics up to four to five times the tooth- or spindlepassing frequencies. If any of the harmonics coincide with one of the natural frequencies of the Machine and/or workpiece structure, the system exhibits forced vibrations. The forced vibrations can simply be solved by applying the predicted cutting or disturbance forces on the transfer function of the structure by the use of the solution of ordinary differential equations in the time domain. However, self-excited, chatter vibrations are the most detrimental for the safety and quality of the machining operations, which are covered in this chapter. Machine Tool chatter vibrations result from a self-excitation mechanism in the generation of chip thickness duringmachining operations. One of the structural modes of the Machine Tool–workpiece system is initially excited by cutting forces. A wavy surface finish left during the previous revolution in turning, or by a previous tooth in milling, is removed during the succeeding revolution or tooth period, which also leaves a wavy surface owing to structural vibrations [112].
-
Machine Tool feed drives
CIRP Annals - Manufacturing Technology, 2011Co-Authors: Yusuf Altintas, L Uriarte, Christian Brecher, Alexander Verl, Gunter PritschowAbstract:This paper reviews the design and control of feed drive systems used in Machine Tools. Machine Tool guides designed using friction, rolling element, hydrostatic and magnetic levitation principles are reviewed. Mechanical drives based on ball-screw and linear motors are presented along with their compliance models. The electrical motors and sensors used in powering and measuring the motion are discussed. The control of both rigid and flexible drive systems is presented along with active damping strategies. Virtual modeling of feed drives is discussed. The paper presents the engineering principles and current challenges in the design, analysis and control of feed drives. ?? 2011 CIRP.
-
Machine Tool spindle units
CIRP Annals - Manufacturing Technology, 2010Co-Authors: Eberhard Abele, Yusuf Altintas, Christian BrecherAbstract:This paper presents the state-of-the-art in Machine Tool main spindle units with focus on motorized spindle units for high speed and high performance cutting. Detailed information is given about the main components of spindle units regarding historical development, recent challenges and future trends. An overview of recent research projects in spindle development is given. Advanced methods of modeling the thermal and dynamical behavior of spindle units are shown in overview with specific results. Furthermore concepts for sensor and actuator integration are presented which all focus on increasing productivity and reliability. ?? 2010 CIRP.
-
Virtual Machine Tool
CIRP Annals - Manufacturing Technology, 2005Co-Authors: Yusuf Altintas, Christian Brecher, Marcus Weck, Stephanie WittAbstract:This paper presents current state of Virtual Machine Tool Technology and related ongoing research challenges. The structural analysis of Machine Tools using Finite Element models and their experimental calibration techniques are presented. The kinematic analysis and optimisation of Machine Tool elements are discussed with sample examples. The interaction between the control of the feed drives, cutting conditions and Machine Tool structure is presented. Multi-body dynamic models of the Machine, which allow integrated simulation of Machine kinematics, structural dynamics and control techniques, are discussed. The interaction between the Machine Tool, controller and cutting process disturbances are discussed with sample examples. The simulation of machining operation and its impact on the dynamics of the Machine Tool and CNC are elaborated. The paper presents both the summary of current and past research, as well as research challenges in order to realise a fully digitised model of the Machine Tool.
Stephanie Witt - One of the best experts on this subject based on the ideXlab platform.
-
Interaction of manufacturing process and Machine Tool
CIRP Annals - Manufacturing Technology, 2009Co-Authors: Christian Brecher, Monika Esser, Stephanie WittAbstract:Analysing the Machine Tool and the machining process individually is necessary in order to tackle the challenges that both have to offer. Nevertheless, to fully understand the manufacturing system, e.g. vibrations, deflections or thermal deformations, the interactions between the manufacturing process and the Machine Tool also have to be analysed. In cutting, grinding and forming there are important effects that can only be explained through these interaction phenomena. This paper presents the current state of research in process-Machine interactions for a wide variety of manufacturing processes. It is based on the findings of the CIRP research group "Process Machine Interaction (PMI)" and on the international publications in this field. Cutting with defined and undefined cutting edges as well as sheet and bulk metal forming are the key processes. The emphasis is on understanding, modelling and simulating all modes of interaction. Additional needs of research in process-Machine interaction are identified for future projects. © 2009 CIRP.
-
Virtual Machine Tool
CIRP Annals - Manufacturing Technology, 2005Co-Authors: Yusuf Altintas, Christian Brecher, Marcus Weck, Stephanie WittAbstract:This paper presents current state of Virtual Machine Tool Technology and related ongoing research challenges. The structural analysis of Machine Tools using Finite Element models and their experimental calibration techniques are presented. The kinematic analysis and optimisation of Machine Tool elements are discussed with sample examples. The interaction between the control of the feed drives, cutting conditions and Machine Tool structure is presented. Multi-body dynamic models of the Machine, which allow integrated simulation of Machine kinematics, structural dynamics and control techniques, are discussed. The interaction between the Machine Tool, controller and cutting process disturbances are discussed with sample examples. The simulation of machining operation and its impact on the dynamics of the Machine Tool and CNC are elaborated. The paper presents both the summary of current and past research, as well as research challenges in order to realise a fully digitised model of the Machine Tool.
Jianzhong Fu - One of the best experts on this subject based on the ideXlab platform.
-
modeling and application of virtual Machine Tool
International Conference on Artificial Reality and Telexistence, 2006Co-Authors: Jianzhong FuAbstract:The recent years of the 21th Century are associated with the advent of virtual reality technologies for modern industry and manufacturing engineering. Virtual Machine Tool Technology is given to design, test, control and Machine parts in a virtual reality environment. This paper presents the methods to model and simulate the virtual Machine Tools in response to change in the machining requirements. Specifically, a set of module combination rules and a modeling method of the structure of Machine Tools using connectivity graph are developed. By this way virtual Machine Tool is implemented. The developed virtual Machine Tool can be efficiently used for industry training and Machine leaning and operating.
Gunter Pritschow - One of the best experts on this subject based on the ideXlab platform.
-
Machine Tool feed drives
CIRP Annals - Manufacturing Technology, 2011Co-Authors: Yusuf Altintas, L Uriarte, Christian Brecher, Alexander Verl, Gunter PritschowAbstract:This paper reviews the design and control of feed drive systems used in Machine Tools. Machine Tool guides designed using friction, rolling element, hydrostatic and magnetic levitation principles are reviewed. Mechanical drives based on ball-screw and linear motors are presented along with their compliance models. The electrical motors and sensors used in powering and measuring the motion are discussed. The control of both rigid and flexible drive systems is presented along with active damping strategies. Virtual modeling of feed drives is discussed. The paper presents the engineering principles and current challenges in the design, analysis and control of feed drives. ?? 2011 CIRP.
