A Mechanistic Cutting Dynamic Model Of Helix End Mill And Its Application For The Intelligent Cam
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A Mechanistic Cutting Dynamic Model Of Helix End Mill And Its Application For The Intelligent Cam
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Author : Kyungcheul Ko
language : en
Publisher:
Release Date : 1997
A Mechanistic Cutting Dynamic Model Of Helix End Mill And Its Application For The Intelligent Cam written by Kyungcheul Ko and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Machine-tools categories.
For mass production of uniform quality parts in modern industry, computer numeric control (CNC) machining is widely used. Generally, machining parameters in CNC machining are chosen from machining tables, skilled experience or empirical methods. One of evident phenomena in machining is that tool wear is unavoidable; hence, the best management of cutting tools in mass production is the minimization of tool wear during sequential machine processes. No systematic selection of cutting parameters in CNC machining can guarantee proper cutting state in complex milling. To provide cutting information in a wide cutting range, a mechanistic cutting dynamic model is essential for a strong foundation in advanced machining industry. Modern CAD/CAM systems are intended to support seamless manufacturing from conceptual design to machining. Benefits of CAD/CAM programs are automation of this sequence and reduction of machining programming time. Normally, conventional CAM systems use the cutting parameters converted values from the machining tables without consideration of diverse cutting conditions. Table driven selection of cutting parameters in conventional CAD/CAM can cause an overload on the cutting tool and result in inefficient machine and tool management. Adaptation of a mechanistic cutting model of the tool in a conventional CAD/CAM system is in high demand for complex cutting conditions involving different materials, tools, and cutting parameters. This feature can minimize the tool wear and breakage that results from incorrect selection of cutting parameters. In this dissertation, as a proper tool for a systematic framework for selection of cutting parameters in complex milling operations, a mechanistic cutting model for a wide cutting situations is developed. To verify this cutting dynamic model, a sequence of experiments are performed. When this advanced feature is added to conventional CAD/CAM systems, seamless machining with safe and efficient cutting parameters is possible. Based on a model developed in this thesis, a framework for selecting safe and efficient cutting parameters in various cutting situations is provided. Solid model based tool trajectory planning with consideration of the effect of the change of depth of cut is demonstrated. Finally, the efficiency of the unit machining process composed of tool trajectory and recommended parameters will be shown for elimination of redundant calculations for the same milling cutting conditions.
Development Of Virtual Cnc Machine Tools And Web Based Machining Process Simulation Mechanistic Cutting Force Models And Determination Of Specific Force Coefficients In Helical End Milling
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Author : Vinay Rao Talekar
language : en
Publisher:
Release Date : 2011
Development Of Virtual Cnc Machine Tools And Web Based Machining Process Simulation Mechanistic Cutting Force Models And Determination Of Specific Force Coefficients In Helical End Milling written by Vinay Rao Talekar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Titanium alloys categories.
"This thesis presents the results of the investigations of mechanistic modeling and simulation of cutting forces in high speed end milling of titanium alloy, Ti-6Al-4V, and the determination of specific cutting and edge force coefficients for carbide bull-nose helical end-mill. A generalized mathematical model representing the outer geometry of an end-mill and the cutter edge geometry is presented. Mechanistic cutting force models have been developed for a general helical end-mill and modeled specifically for a bullnose helical end-mill. A MATLAB code for the mechanistic cutting force models have been developed for the simulation of cutting force components in end milling and for the determination of specific cutting and edge force coefficients for any workpiece-tool material pair. Specific cutting and edge force coefficients are obtained for carbide bullnose helical end-mill - titanium alloy workpiece material pair at 10% radial immersion up-milling experiments. The effects of machining parameters: feed per tooth, helix angle, axial depth of cut, corner radius, number of cutter flutes, and spindle speed on cutting forces were investigated. End milling experiments were conducted on titanium alloy, Ti-6Al-4V, using a 0.5 inch (12.7 mm) diameter carbide bull-nose helical end-mill to verify the models. Predicted cutting force components (F[subscript x], F[subscript y], and F[subscript z]) obtained by the mechanistic cutting force models were compared with measured experimental values, and also with predicted and measured values from published literature. The results were in good agreement in both cases. This method for the determination of specific force coefficients and predicting cutting forces for titanium alloys can easily be extended to other metal alloys such as Hastelloy, Inconel, and niobium alloys"--Abstract, leaf iv.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 1998
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Dissertations, Academic categories.
Mechanistic Modeling Of Cutting Forces In Wavy Edge Bull Nose Helical End Milling Of Inconel 718 Under Different Cooling Lubrication Strategies
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Author : Abdulhakim Ali Sultan
language : en
Publisher:
Release Date : 2015
Mechanistic Modeling Of Cutting Forces In Wavy Edge Bull Nose Helical End Milling Of Inconel 718 Under Different Cooling Lubrication Strategies written by Abdulhakim Ali Sultan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
"This research presents the results of the development of a mechanistic cutting force prediction model for the wavy-edge bull-nose helical endmill (WEBNHE). The mechanistic model was developed to predict cutting force components and the resultant cutting force in high-speed end-milling of Inconel 718 under two cooling strategies: emulsion and Minimum Quantity Lubrication (MQL). The effects of the cooling strategies are incorporated into the mechanistic model through six cutting force coefficients (K[sub tc] ,K[sub rc] ,K[sub ac]), and edge force coefficients (K[sub te], K[sub re], K[sub ae]), which have been experimentally identified in a separate research. The mechanistic model was validated by conducting end-milling experiments on Inconel 718 using a WEBNHE of 1.25'' diameter under emulsion and MQL cooling strategies. In addition to cutting forces prediction, the mechanistic cutting force prediction model is used to investigate the effects of the cooling strategy, and the effects of the geometric parameters of the WEBNHE on the predicted cutting force components and the resultant cutting force. The geometric parameters investigated in this research were: wave magnitude, wave length, axial shift, and the helix angle. The cutting force components and the resultant cutting force predicted by this mechanistic cutting force model under the two cooling strategies were in good agreement with the experimental results. Additionally, the results show that an increase in the depth of cut under MQL generates less cutting force than the same increase under emulsion. Moreover, all predicted cutting force components increase when the magnitude of the WEBNHE increases, whereas they decrease when the wave length, axial shift, and the helix angle increase"--Abstract, page iv.
Milling Simulation
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Author : Weihong Zhang
language : en
Publisher: John Wiley & Sons
Release Date : 2016-06-15
Milling Simulation written by Weihong Zhang and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-06-15 with Mathematics categories.
Reliable scheduling in cutting conditions is very important in machining processes, and this requires thorough understanding of the physical behaviors of the machining process, which cannot be achieved without understanding the underlying mechanism of the processes. The book describes the mechanics and dynamics together with the clamping principles in milling processes, and can be used as a guideline for graduate students and research engineers who wish to be effective manufacture engineers and researchers. Many books have focused on common principles, which are suitable for general machining processes, e.g., milling, turning and drilling, etc. This book specifically aims at exploring the mechanics and dynamics of milling processes. Original theoretical derivations and new observations on static cutting force models, dynamic stability models and clamping principles associated with milling processes are classified and detailed. The book is indented as a text for graduate students and machining engineers who wish to intensively learn milling mechanism and machine tool vibration.
Cad Of Solid Carbide End Mills And Its Applications
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Author : Chun Du
language : en
Publisher:
Release Date : 2011
Cad Of Solid Carbide End Mills And Its Applications written by Chun Du and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Nowadays, carbide end mills are widely utilized in the aluminum, titanium and steel cutting industries, so the more and more high-precision requirements to design of cutters are provided by users. Meanwhile, in order to finish the simulation and analysis of cutting processing, it is also important to design more free-control geometry model, and then transit into the CAD/CAM systems. For this purpose, many research works have been successfully conducted on optimizing the geometry model of cutters to get more real and easy controlled geometry; however, another critical factor, there are still more space to optimize the geometry model of cutters. To finish this task, in this work, first, a method has been established and implemented in the MATLAB to convert mathematic model into a free-form geometry model. Then, an accurate calculation system of area moment inertial of cutter is built. Finally, a detailed discussion on the cutting force of end-mills is provided, based on cutting simulation software. The major contributions of this work include the free-form end-mill modeling, which can render the 3-D geometric model of an end-mill in CATIA system, and a type of calculation of cutter area moment of inertial. This work can be used, together with an existing cutting force calculation method, to accurately predict cutting force during milling in order to get better geometry model of cutter. Meanwhile, solid modelling of the helical cutting tool can be carried out with computer graphics programming. It can also provide more precise 3-D solid models of end-mills for machining simulation by using finite element software.
American Doctoral Dissertations
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Author :
language : en
Publisher:
Release Date : 1997
American Doctoral Dissertations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Dissertation abstracts categories.
Cad Cam Abstracts
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Author :
language : en
Publisher:
Release Date : 1992
Cad Cam Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with CAD/CAM systems categories.
Sculptured Surface Machining
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Author : Byoung K. Choi
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Sculptured Surface Machining written by Byoung K. Choi and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
This essential book documents the latest research progress and key issues affecting SSM software development. With a particular focus on the CAD/CAM environment, it provides a rich source of reference and covers a wide range of topics.
Manufacturing Automation
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Author : Yusuf Altintas
language : en
Publisher: Cambridge University Press
Release Date : 2012-01-16
Manufacturing Automation written by Yusuf Altintas and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-01-16 with Technology & Engineering categories.
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.