Dimensional X-ray Computed Tomography Conference 2016

Transcription

1 Dimensional X-ray Computed Tomography Conference th May 2016 Conference Chair: Michael McCarthy. 1 michael.mccarthy@npl.co.uk

2 Welcome and House keeping 1) Fire / emergency(1) 2) Toilet (1) / Smoking 3) Mobile phone~ Silent pls 4) Internet (2) 5) Lab tour ticket (30 Ticket available at lunch time~ See Abigail Stone) 6) Speaker s time. (PP!). 5 mins left 1 st warning, 2 mins left second warning, 18 mins time to stop ( 2 Mins ~ questions) Total 20 mins! 7) Think about technical questions to raise in the discussion session to be held at 3:55pm. 8) Questionnaire~ Happy sheet. 2 michael.mccarthy@npl.co.uk

3 Who is who? and thankyou Conference Chair: Michael McCarthy. Conference Co-Chair: Dr Wenjuan Sun. Session Chair~ Morning Session Chair: Mr Stephen Brown. Session Chair~ Afternoon Conference Coordinator: Event organising team: PowerPoint co-ordinator: Lab tours: Mrs Veronica Luttman. Mr Roger Hughes; Miss Hannah Carter; Miss Abigail Stone; Mrs Shelley Sharma. Mr Sean Woodward, Dr Martin Dury, Mr David Flack & Hannah Corcoran. All the presenters ~ 12 Invited speaker and 15 Poster Papers Exhibitors: Zeiss and Nikon. Delegates: Too many to list! A very good turnout. Thank you. 3 michael.mccarthy@npl.co.uk

4 If in doubt, please just ask! Michael McCarthy Stephen Brown Wenjuan Sun Sean Woodward (PowerPoint ) Abigail Stone Lab Tour Tickets Reception. Thirty available at lunch time for 4:30pm tours. XCT lab, Freeform Centre and Cartesian CMMs. 4 michael.mccarthy@npl.co.uk

5 P r o g r a m m e 09:30 Registration Session 1 09:45 Opening talk, Michael McCarthy, National Physical Laboratory 10:05 Paul Bills, University of Huddersfield 10:25 Andrew Lodge, Rolls-Royce 10:45 Coffee break 11:15 Robert Speller, University College London 11:35 Moataz Attallah, University of Birmingham 11:55 Ian Sinclair, University of Southampton 12:15 David Bate, Nikon Metrology Session 2 12:35 Lunch Break and poster presentations (issue lab tour tickets) Session 3 13:35 David Eatock, Airbus Group Innovations 13:55 Wenjuan Sun and Stephen Brown, National Physical Laboratory 14:15 Joseph Lifton, University of Southampton 14:35 Robert Atwood, Diamond Light Source 14:55 Coffee break 15:15 Jay Warnett, University of Warwick 15:35 Nick Brierley, Manufacturing Technology Centre 15:55 Discussion of future works and collaborations 16:25 Event close 16:30 Lab tour (optional) Session 4 Page 3 of Delegate pack 5 michael.mccarthy@npl.co.uk

6 Developments towards verifying the performance of dimensional XCT systems Michael McCarthy National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK 6 michael.mccarthy@npl.co.uk

7 National and International Standards BSI started in 1901 as a committee of engineers determined to standardise the number and types of steel sections! The International Organization for Standardisation (ISO) is a worldwide federation of national standards bodies from some 140 countries. The mission of ISO is to promote the development of standardisation and related activities in the world. ISO's work results in international agreements that are published as International Standards. 7 michael.mccarthy@npl.co.uk

8 Metre The NPL PI Metre copy 8 michael.mccarthy@npl.co.uk

9 Is an XCT system a CMM? No in the dimensional metrology world it s a coordinate measuring system

10 CMM geometric errors? A Cartesian CMM has twenty-one sources of kinematic error, machine related due to imperfect manufacturing or alignment during assembly. The straight-line motion of a moving component always involves six components of deviation from the nominal path: These are: a) one positional linear deviation (Xx), in the direction of motion(1) b) two linear deviations orthogonal (Xy,Xz) to the direction of motion (straightness) (2) c) three angular deviations (rigid body rotations - roll, pitch and yaw) (3). For one axis =6, Thus of three axis = 3 * 6= 18. Additionally~ three squareness errors between pairs of axes. Hence = twenty-one sources of kinematic error Ref: D.Flack NPL 10 michael.mccarthy@npl.co.uk

11 ISO 10360, Well~ Just what is it? ISO Series : Geometrical Product Specifications (GPS) a series of internationally agreed written standards (Parts 1-10 so far). It is a performance verification standard for coordinate measuring systems (machines). 11 michael.mccarthy@npl.co.uk

12 ISO for a user Demonstrating traceability to national standards. Estimating the accuracy of measurements made with CMMs is important for maintaining confidence and reliability in the measurements. The ISO series of standards detail acceptance / reverification tests to determine whether the CMM performs to the manufacturer s stated maximum permissible error (MPE) of length measurement. Ref: D.Flack NPL 12 michael.mccarthy@npl.co.uk

13 Maximum Permissible Error The term MPE, L (length) is the term most CMM users will be aware of~ The length measuring accuracy of their CMM. MPE, is usually stated in one of three forms: 13 michael.mccarthy@npl.co.uk

14 Consider Three ways of expressing MPE A B C. Ref: D.Flack NPL 14 michael.mccarthy@npl.co.uk

15 Geometrical Product Specifications (GPS) Acceptance and re-verification tests for CMM ISO : 2000 Part 1: Vocabulary. International standard ISO defines a coordinate measuring machine (CMM) as a measuring system with the means to move a probing system and with capability to determine coordinates on a workpiece surface. You may well ask What is a probe? what is a workpiece etc? 15 michael.mccarthy@npl.co.uk

16 Geometrical Product Specifications ISO : 2009 Part 2: CMMs used for measuring linear dimensions. 16

17 Geometrical Product Specifications ISO : 2000 Part 3: CMMs with the axis of a rotary table as the fourth axis. 17 michael.mccarthy@npl.co.uk

18 Geometrical Product Specifications ISO : 2000 Part 4: CMMs used is scanning measuring mode. 18

19 Geometrical Product Specifications ISO :2010 Part 5: CMMs using multiplestylus probing systems. 19

20 Geometrical Product Specifications ISO :2001 Part 6: Estimation of errors in computing Gaussian associated features. SOFTWARE Specifies a method for testing software used for computing associated features from coordinate measurements. The test is of the software alone and therefore independent of the coordinate measuring system. 20 michael.mccarthy@npl.co.uk

21 Geometrical Product Specifications ISO Part 7: CMMs equipped with opticalimaging probing systems. 21

22 Geometrical Product Specifications ISO/CD Part 8: CMMs with optical distance sensors. 22

23 Geometrical Product Specifications ISO/DIS Part 9: CMMs with multiple probing system. 23

24 ISO further parts under development Part 10 Under development~ Trackers Part 12 Under development~ AACMS 24

25 ISO Part XCT under development Part 11?? International Task Force ~ XCT 25 michael.mccarthy@npl.co.uk

26 Over view~expansion of ISO series and its application (Toshiyuki Takatsuji, Makoto Abe, Hiroyuki Fujimoto NMIJ ict Conference 2014) 26

27 ISO Part XCT (Initial staring point for a draft was based around German VDI/VDE 2630 Guide 2008) 27 michael.mccarthy@npl.co.uk

28 Some ~ Current ISO XCT 3D metrology verification Task Force members. 28 michael.mccarthy@npl.co.uk

29 ISO Part XCT Task Force Draft (leader is PTB) Current status 2016 of Draft. Interested to know more? Please ask me.. 29

30 A Revised Framework of XCT verification test at 2015 Concentrate initially on: Bi direction and Uni directional No-material influence test With-material influence test E-test Length Test (Distances, Diameters..) 30

31 Example test samples Material Influence Objects typically 30mm-100mm in size 31

32 Hole plate design Material influence 32

33 Step cylinder gauge used for assessing internal measurement capability of dimensional X-ray CT. (max dia 60mm) (Toshiyuki Takatsuji, Makoto Abe, Hiroyuki Fujimoto NMIJ ict Conference 2014) Scale max dia 75mm 33

34 Stepped Cylinder at NPL Scale max dia 75mm 34

35 Hole plate at NPL Scale 48 mm side wall 35

36 Concluding note. Verification of an XCT dimensional measuring system is far more complex than for any other Coordinate measuring system. X-ray source, Beam hardening, Mechanical geometry, Magnification, Detector response and Software reconstruction~ to name but a few. Other NPL papers presented today, will identify the research required to determine the error sources and their effect. and the need for a standard that can address these challenges. 36 michael.mccarthy@npl.co.uk