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Author: Theodore R. Comstock Publisher: ISBN: Category : Machine-tools Languages : en Pages : 172
Book Description
This project is engaged in a program of research which is directed at the study of the mechanism of forced vibrations in machine tool-metal cutting systems. Analytical methods, test and specification techniques have been developed that should significantly aid machine tool manufacturers in the design of essentially vibration-free machine tools for given cutting operations. The types of disturbances which cause forced vibrations in machine tools are described and categorized. The detrimental effects upon performances, which these disturbances have during cutting operations, are discussed. An attempt is made to show that the problem of forced vibrations in metal cutting systems can be generalized and simplified to a very large extent. The analytical methods to be used in this general approach are developed, and the experimental results obtained therefrom are discussed. In order to accomplish the objectives of this program the study of the mechanism of forced vibrations was divided into two main areas. The first of these areas is concerned with the effects of forced vibration due to variations in cutting depth and disturbances from internal and external forces. The remaining phase of this program is concerned with the effects of forced vibration caused by the transmission of forces through the foundation. (Author).
Author: Theodore R. Comstock Publisher: ISBN: Category : Machine-tools Languages : en Pages : 172
Book Description
This project is engaged in a program of research which is directed at the study of the mechanism of forced vibrations in machine tool-metal cutting systems. Analytical methods, test and specification techniques have been developed that should significantly aid machine tool manufacturers in the design of essentially vibration-free machine tools for given cutting operations. The types of disturbances which cause forced vibrations in machine tools are described and categorized. The detrimental effects upon performances, which these disturbances have during cutting operations, are discussed. An attempt is made to show that the problem of forced vibrations in metal cutting systems can be generalized and simplified to a very large extent. The analytical methods to be used in this general approach are developed, and the experimental results obtained therefrom are discussed. In order to accomplish the objectives of this program the study of the mechanism of forced vibrations was divided into two main areas. The first of these areas is concerned with the effects of forced vibration due to variations in cutting depth and disturbances from internal and external forces. The remaining phase of this program is concerned with the effects of forced vibration caused by the transmission of forces through the foundation. (Author).
Author: Yusuf Altintas Publisher: Cambridge University Press ISBN: 1139504630 Category : Technology & Engineering Languages : en Pages : 381
Book Description
Metal cutting is widely used in producing manufactured products. The technology has advanced considerably along with new materials, computers and sensors. This new edition considers the scientific principles of metal cutting and their practical application to manufacturing problems. It begins with metal cutting mechanics, principles of vibration and experimental modal analysis applied to solving shop floor problems. There is in-depth coverage of chatter vibrations, a problem experienced daily by manufacturing engineers. Programming, design and automation of CNC (computer numerical control) machine tools, NC (numerical control) programming and CAD/CAM technology are discussed. The text also covers the selection of drive actuators, feedback sensors, modelling and control of feed drives, the design of real time trajectory generation and interpolation algorithms and CNC-oriented error analysis in detail. Each chapter includes examples drawn from industry, design projects and homework problems. This is ideal for advanced undergraduate and graduate students and also practising engineers.
Author: Air Force Materials Laboratory (U.S.) Publisher: ISBN: Category : Materials Languages : en Pages : 270
Book Description
Technical reports published by the Air Force Materials Laboratory during the period 1 January 1967-31 December 1967 are abstracted herein and indexed by branches of the laboratory, technical subject matter, investigator, project monitor and contractor. Reports on research conducted by the Air Force Materials Laboratory personnel as well as that conducted on contract are included.
Author: Alfred Otto Schmidt Publisher: ISBN: Category : Machine-tools Languages : en Pages : 126
Book Description
An investigation of the internal and external sources of vibration in machining operations which impair the performance quality of conventional machine tools was conducted. Particular attention was give to the surface finish of workpieces and the deflection of specific machine tool components. A literature survey on machine tool vibrations was abstrated. All experimental work was carried out under such operating conditions as can be found in an average precision machine shop. The measuring instruments used were standard items except in the case of a special surface analyzer. Sources of mechanical vibrations in machine tools can be determined satisfactorily with limited instrumentation but a thorough understanding of machine tool functions and metal cutting technology is necessary. Forced and self-excited vibrations can occur simultaneously with both having a detrimental effect upon surface finish and dimensions. (Author).
Author: C. Steve Suh Publisher: John Wiley & Sons ISBN: 1118402782 Category : Technology & Engineering Languages : en Pages : 295
Book Description
Presents new developments on machine tool vibration control based on discontinuous dynamical systems Machining instability is a topical area, and there are a wide range of publications that cover the topic. However, many of these previous studies have started by assuming that the behavior of the system can be linearised. Meanwhile, there are many recent advances in the fields of signal processing, nonlinear dynamics, and nonlinear control, all of which are relevant to the machining stability problem. This book establishes the fundamentals of cutting mechanics and machine tool dynamics in the simultaneous time-frequency domain. The new nonlinear control theory developed by the authors that facilitates simultaneous control of vibration amplitude in the time-domain and spectral response in the frequency-domain provides the foundation for the development of a controller architecture universally viable for the control of dynamic instability including bifurcation and chaos. Once parameters underlying the coupling, interaction, and evolution of different cutting states and between the tool and workpiece are established, they can then be incorporated into the architecture to create a control methodology that mitigate machining instability and enable robust, chatter-free machine tool design applicable in particular to high speed micro- and nano-machining. Presents new developments on machine tool vibration control based on discontinuous dynamical systems Provides a clear and concise approach to the understanding and control of machine tool and workpiece vibrations from an alternative view, contributing to an in-depth understanding of cutting dynamics and robust control of machining instability Equips the reader with the knowledge to understand the dynamics of cutting and operation of machine-tool systems in different conditions as well as the concept of cutting instability control Includes data examples in MATLAB coding
Author: Herwart Opitz Publisher: ISBN: Category : Languages : en Pages : 69
Book Description
The report contains a program of research which is directed at the problem of determining the dynamic stability of machine tool-metal cutting systems. Such a study will provide machine tool manufacturers with the necessary analytical methods tests and specification techniques to determine a vibration free cutting for machine tools. The special advantage of the system analysis by means of stochastic signals is the natural kind of stressing during the record of signals for the dynamic compliance test. (Author).
Author: Theodore R. Comstock
Author: Theodore R. Comstock
Author: University of Cincinnati. Department of Mechanical Engineering
Author: 
Author: Gerald W. Long
Author: Defense Documentation Center (U.S.)
Author: Yusuf Altintas
Author: Air Force Materials Laboratory (U.S.)
Author: Alfred Otto Schmidt
Author: C. Steve Suh
Author: Herwart Opitz