Diamond Turning Of Silicon Nitride

DOWNLOAD

Download Diamond Turning Of Silicon Nitride PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Diamond Turning Of Silicon Nitride book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page

Diamond Turning Of Silicon Nitride

DOWNLOAD
Author : Ronnie Rex Fesperman
language : en
Publisher:
Release Date : 2004

Diamond Turning Of Silicon Nitride written by Ronnie Rex Fesperman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

This thesis describes experimental work carried out to study the ability to ductile single point diamond turn both Ceradyne's Ceralloy 147-31N and Allied Signal's GS-44 silicon nitride (Si[subscript]3N[subscript]4) and the effect single point diamond turning has on the strength of GS-44 Si[subscript]3N[subscript]4. The Nanocut II nanometric cutting instrument was first employed to determine if the critical depth of cut, corresponding to a ductile to brittle transition, for 147-31N Si[subscript]3N[subscript]4 was within the nanometric regime. A Precitech Nanoform 350 diamond turning machine was then employed to determine the limits of ductile regime machining at larger depths of cut for 147-3 IN and GS-44 Si[subscript]3N[subscript]4 . An investigation into the ability to diamond turn Si[subscript]3N[subscript]4 with both single crystal and polycrystalline diamond tools was performed. 140 GS-44 rectangular flexural bar test specimens in four sample sets of 35 specimens each were prepared by diamond turning with polycrystalline diamond tools at depths of 250 nm, 500 nm, 5 [mu]m, and 10 [mu]m. Four-point flexure testing was performed on the diamond turned flexure bars as well as flexure bars prepared by grinding to assess the effect single point polycrystalline diamond turning has on the strength of GS-44 Si[subscript]3N[subscript]4 in comparison to grinding. Fractography was carried out to identify the origin of failure of each specimen and Weibull statistical analysis was used to characterize the strength distribution for each machining condition. Finally, the effect of negative rake angle and rate of tool wear of single crystal diamond tools was studied by diamond turning thin disks of GS-44 Si[subscript]3N[subscript]4.

Investigation Of Cutting Mechanics In Single Point Diamond Turning Of Silicon

DOWNLOAD
Author : Amir Mir
language : en
Publisher:
Release Date : 2016

Investigation Of Cutting Mechanics In Single Point Diamond Turning Of Silicon written by Amir Mir and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

As a kind of brittle material, silicon will undergo brittle fracture at atmospheric pressure in conventional scale machining. Studies in the last two decades on hard and brittle materials including silicon, germanium, silicon nitride and silicon carbide have demonstrated ductile regime machining using single point diamond turning (SPDT) process. The mirror-like surface finish can be achieved in SPDT provided appropriate tool geometry and cutting parameters including feed rate, depth of cut and cutting speed are adopted.The research work in this thesis is based on combined experimental and numerical smoothed particle hydrodynamics (SPH) studies to provide an inclusive understanding of SPDT of silicon. A global perspective of tool and workpiece condition using experimental studies along with localized chip formation and stress distribution analysis using distinctive SPH approach offer a comprehensive insight of cutting mechanics of silicon and diamond tool wear. In SPH modelling of SPDT of silicon, the distribution of von Mises and hydrostatic stress at incipient and steady-state was found to provide the conditions pertinent to material failure, phase transformation, and ductile mode machining. The pressure-sensitive Drucker Prager (DP) material constitutive model was adopted to predict the machining response behaviour of silicon during SPDT. Inverse parametric analysis based on indentation test was carried out to determine the unknown DP parameters of silicon by analysing the loading-unloading curve for different DP parameters. A very first experimental study was conducted to determine Johnson-Cook (J-C) model constants for silicon. High strain rate compression tests using split Hopkinson pressure bar (SHPB) test as well as quasi-static tests using Instron fatigue testing machine were conducted to determine J-C model constants.The capability of diamond tools to maintain expedient conditions for high-pressure phase transformation (HPPT) as a function of rake angle and tool wear were investigated experimentally as well as using SPH approach. The proportional relationship of cutting forces magnitude and tool wear was found to differ owing to wear contour with different rake angles that influence the distribution of stresses and uniform hydrostatic pressure under the tool cutting edge. A new quantitative evaluation parameter for the tool wear resistance performance based on the cutting distance was also proposed. It was also found that the machinability of silicon could be improved by adopting novel surface defect machining (SDM) method.The ductile to brittle transition (DBT) with the progressive tool wear was found to initiate with the formation of lateral cracks at low tool wear volume which transform into brittle pitting damage at higher tool edge degradation. A significant variation in resistance to shear deformation as well as position shift of the maximum stress values was observed with the progressive tool wear. The magnitude and distribution of hydrostatic stress were also found to change significantly along the cutting edge of the new and worn diamond tools.

Experimental And Numerical Analyses Of Ductile Regime Machining Of Silicon Nitride

DOWNLOAD
Author : Satya Kumar Ajjarapu
language : en
Publisher:
Release Date : 2004

Experimental And Numerical Analyses Of Ductile Regime Machining Of Silicon Nitride written by Satya Kumar Ajjarapu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

Developments in precision machining technology have shown that ductile regime machining of advanced ceramics such as Silicon Nitride (Si[subscript]3N[subscript]4) is possible under controlled cutting conditions. In the present work, the mechanics of ductile regime machining of silicon nitride at micron level depths was studied experimentally and numerically. Machining tests were carried out for depths of cut ranging from 250 nm to 10 [mu]m on Diamond Turning Machine (DTM). Force and surface roughness data collected from diamond turning of silicon nitride samples were presented. Chip morphology studies were also carried out using Scanning Electron Microscopy (SEM) for the machined samples. The mechanical behavior of silicon nitride is treated using the Drucker-Prager yield criterion and implemented in the commercial machining software AdvantEdge. Numerical simulations were conducted for depths of cut ranging from 1 [mu]m to 40 [mu]m and at rake angles from 0[superscript]o to -60[superscript]o. Pressure distribution at the tool and workpiece interface for different depths of cut and rake angles was studied. Experimental results were correlated with the numerical results for -5[superscript]o and -45[superscript]o rake angles.

Diamond Machining In 5 Wt Y0 O0 Sinter Hipped Silicon Nitride

DOWNLOAD
Author : M. A. Q. Kirwan
language : en
Publisher:
Release Date : 1992

Diamond Machining In 5 Wt Y0 O0 Sinter Hipped Silicon Nitride written by M. A. Q. Kirwan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Ceramics categories.

Surface Generation In Ultra Precision Diamond Turning

DOWNLOAD
Author : W. B. Lee
language : en
Publisher: John Wiley & Sons
Release Date : 2003-02-07

Surface Generation In Ultra Precision Diamond Turning written by W. B. Lee 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 2003-02-07 with Technology & Engineering categories.

An Engineering Research Series title. One of the remarkable achievements of modern manufacturing techniques is the ability to achieve nano-metre surface finishes. Ultraprecision machining based on single-point diamond turning (SPDT) is a very important technique in the manufacture of high-precision components where surface finish is critical. Complex optical surfaces, for example, can be produced without the need for post-machining polishing. This book focuses on the aspect of modelling nano-surface generation in ultra precision SPDT. Potential industrial applications in the prediction of surface quality, the process optimization, and precision mould manufacturing are also studies. The essential differences between single-point diamond turning and conventional machining are described. The history and technology of single-point diamond turning are presented and single chapters emphasize the related metrology and cutting mechanics. Important aspects of surface generation are also discussed. Features of the text are the sound approach, systematic mathematical modelling, and computer-aided simulation of surface generation in the development of surfaces exhibiting nano-surface qualities. TOPICS COVERED INCLUDE: Fundamentals of ultra-precision diamond turning technology Cutting mechanics and analysis of microcutting force variation Mechanisms of surface generation Characterization and modelling of nano-surface generation Computer-aided simulation of nano-surface generation Diamond turning of aspheric optics. Based upon the extensive experience of the authors Surface Generation in Ultra-precision Diamond Turning: Modelling and Practices will be of interest to engineers, scientists, and postgraduate students.

Diamond Machining In 5 Wt Y2o3 Sinter Hipped Silicon Nitride

DOWNLOAD
Author : M Kirwan
language : en
Publisher:
Release Date : 1992

Diamond Machining In 5 Wt Y2o3 Sinter Hipped Silicon Nitride written by M Kirwan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.

Diamond Machining In 5 Wt Y B2 So B3 S Sinter Hipped Silicon Nitride

DOWNLOAD
Author : M. A. Q. Kirwan
language : en
Publisher:
Release Date : 1992

Diamond Machining In 5 Wt Y B2 So B3 S Sinter Hipped Silicon Nitride written by M. A. Q. Kirwan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.

Effect Of Different Pretreatment Parameters On Silicon Nitride Substrate Surface Roughness Prior To Diamond Deposition

DOWNLOAD
Author : Idris Saaran
language : en
Publisher:
Release Date : 2010

Effect Of Different Pretreatment Parameters On Silicon Nitride Substrate Surface Roughness Prior To Diamond Deposition written by Idris Saaran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Chemical vapor deposition categories.

Diamond Turn Machining

DOWNLOAD
Author : R. Balasubramaniam
language : en
Publisher: CRC Press
Release Date : 2017-09-01

Diamond Turn Machining written by R. Balasubramaniam and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-09-01 with Technology & Engineering categories.

The goal of this book is to familiarize professionals, researchers, and students with the basics of the Diamond Turn Machining Technology and the various issues involved. The book provides a comprehensive knowledge about various aspects of the technology including the background, components of the machine, mechanism of material removal, application areas, relevant metrology, and advances taking place in this domain. Solved and unsolved examples are provided in each of the areas which will help the readers to practice and get familiarized with that particular area of the Diamond Turn Machining process.

Ductile Regime Diamond Turning Of Germanium And Silicon

DOWNLOAD
Author : Peter Newell Blake
language : en
Publisher:
Release Date : 1988

Ductile Regime Diamond Turning Of Germanium And Silicon written by Peter Newell Blake and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Diamond turning categories.