Browsing by Author "Stephenson, David J."

Browsing by Author "Stephenson, David J."

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  • The impact of tool performance on micromachining capability 
    Zdebski, Daniel (Cranfield University, 2012-06)
    Micro-milling represents a versatile and fast manufacturing process suitable for production of fully 3D micro-components. Such components are demanded for a vast number of industrial applications including safety systems, ...
  • Investigation into the grinding of titanium alloys 
    Wang, S. H. (Cranfield University, 2000-07)
    Titanium alloys are used extensively in the aerospace industry due to their high specific strength and excellent corrosion resistance. However, their poor thermal conductivity and high chemical reactivity with tool ...
  • Machining of Optical Surfaces in Brittle Materials using an Ultra-Precision Machine Tool 
    Shore, Paul (Cranfield University, 1995-03)
    Investigations of machining optical surfaces into brittle materials using an ultra precision machine tool are presented. The newly developed ultra precision NION machine is evaluated to gain a good appreciation of its ...
  • Machining surfaces of optical quality by hard turning 
    Knuefermann, Markus M. W. (Cranfield UniversitySchool of Industrial and Manufacturing Science, 2003-11)
    The main aim of this work was the machining by hard turning of surfaces with optical surface quality. A numerical target had been set as a surface roughness Ra = 10nm. It has been shown that achieving roughness of that ...
  • The Mechanism of Dross Formation on Aluminium and Aluminium Magnesium Alloys 
    Impey, S. A. (Cranfield University, 1989-12)
    Metal loss is an unavoidable consequence of the large scale melting of aluminium and its alloys. The objective of such processing must be to minimise losses, both from an economic viewpoint and to ensure optimum quality ...
  • Nano-level surface generation on H13 alloy steel by ultra-precision grinding with electrolytic in-process dressing 
    Javaid, N.; Stephenson, David J.; Vitanov, V. I. (2010-09-16)
    The aim of this work was to achieve the surface finish of 10nm on a 40mm diameter disc of chrome-molybdenum-vanadium alloyed steel (H13) by using precision grinding process with electrolytic in-process dressing. The ...
  • A new powder encapsulation method and its implications on densification by hot isostatic pressing 
    Downing, M. (Cranfield University, 1993-04)
    Hot isostatic pressing is now an accepted material processing technique for the consolidation of metal powders to near-net-shape components. This thesis examines the use of coatings as in-situ envelopes to overcome the ...
  • The performance of a porous ceramic hydrostatic journal bearing 
    Durazo-Cardenas, Isidro; Corbett, John; Stephenson, David J. (Professional Engineering Publishing, 2010)
    The performance of a porous-ceramic hydrostatic journal bearing manufactured by the starch consolidation (SC) technique has been examined using a highly instrumented test rig. The results have been compared with those ...
  • Permeability and dynamic elastic moduli of controlled porosity ultra-precision aerostatic structures 
    Durazo-Cardenas, Isidro; Corbett, John; Stephenson, David J. (Elsevier Science B.V., Amsterdam., 2014-03-03)
    Porous ceramic aerostatic bearings enable precise and smooth motion and improved stiffness compared with widely used orifice restrictor bearings. However, the processing techniques so far used are too complex or rely in ...
  • Powder co-injection moulding 
    Hanson, S. M. J. (Cranfield University, 2000-09)
    A novel powder processing technique has been developed by combining conventional powder injection moulding with polymer co-injection moulding, to permit the in-situ surface engineering of metal or ceramic components as ...
  • Precision Grinding for Rapid Manufacturing of Large Optics 
    Tonnellier, Xavier (Cranfield University, 2009-05)
    Large scale nuclear fusion and astronomy scientific programmes have increased the demand for large freeform mirrors and lenses. Thousands of one metre class, high quality aspherical optical components are required within ...
  • Predictive grinding process optimisation and monitoring 
    Leeson, David Christopher (2005-09-09)
    Grinding is one of the oldest and most important metal removal processes, and is capable of high dimensional and surface finish tolerances. It is a complex and expensive process; industry has much to gain by increasing ...
  • Processing and fluid flow characteristics of hot isostatically pressed porous alumina for aerostatic bearing applications 
    Kwan, Y. B. P (Cranfield University, 1996-12)
    Despite their well known superior load and stiffness characteristics, the wide-spread use of porous aerostatic bearings in preference to other bearing types has been hampered by difficulties in controlling the permeability ...
  • Reactive plasma spraying 
    Al-Sabouni, Omar (Cranfield University, 1999)
    Reactive Plasma Spraying (RPS) with a hydrocarbon gas has been studied as a method to improve the mechanical properties of a commercially available 80: 20 nickel-chromium alloy, and subsequently as a method to reduce ...
  • A study of the convection heat transfer coefficients of grinding fluids 
    Jin, T.; Stephenson, David J. (Technische Rundschau, Hallwag Publishers; 1999, 2008-05-09)
    By using hydrodynamic and thermal modelling, the variation of the convection heat transfer coefficient (CHTC) of the process fluids within the grinding zone has been investigated. Experimental measurements of CHTC for ...
  • A study of the wear process related to twin-screw extruders 
    Grigoroudis, K. (Cranfield University, 1996-07)
    Extruders are used in a wide range of process industries and high reliability is essential if cost effective manufacturing is to be maintained. A critical part of twin-screw extruders is the barrel that must withstand ...
  • Thermal and deformation analysis of joint interfaces in machine tools 
    Gashi, Bekim (2008-05)
    Machine tools are made up of many different parts connected together. In order to understand and create more accurate thermal and deformation numerical models the heat transfer characteristics of machine tool interfaces ...
  • Thermal characteristics of grinding fluids 
    Massam, Mark (Cranfield University, 2008)
    High Efficiency Deep Grinding (HEDG) combines high depths of cut, high grinding wheel speeds with high work piece feed rates to deliver a very high stock removal process that can produce components free of surface damage. ...