L03Notes

L03Notes - Lecture 3 Product Quality Dimensional and...

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Unformatted text preview: Lecture 3: Product Quality, Dimensional and Surface Metrology Objective • Understand issues relating to product quality • Understand basic concepts in surface metrology • Understand challenges presented by measurement uncertainty Methods • Discussion of quality control and process control • Review of surface metrology history techniques and parameters • Discussion of uncertainty, tolerancing and an in class experiment Reference Material Metrology and Properties of Engineering Surfaces • Mainsah, E.; Greenwood, J.A.; Chetwynd, D.G. Metrology and Properties of Engineering Surfaces. Springer - Verlag. • Online version available at: • http://www.knovel.com/knovel2/Toc.jsp?BookID=1066&VerticalID=0 Some web sites • http://www.me.wpi.edu/Research/SurfMet/terms.html • http://www.me.wpi.edu/Research/SurfMet/ • http://www.digitalsurf.fr/en/index.html • http://www.truegage.com/index.php • http://www.predev.com/smg/index.html • http://www.physics.nist.gov/cuu/Uncertainty/index.html Lecture Notes Product quality, dimensional and surface metrology Objectives Methods Discussion of quality control and process control Understand issues relating to product quality Discussion of uncertainty, tolerancing and an in class experiment Understand challenges presented by measurement uncertainty Review of surface metrology history techniques and parameters Understand basic concepts in surface metrology What is product quality? (How can we measure it?) • Quality?- – Conformance with specifications. – Customer Satisfaction • Metrology? – Final Inspection – In-process inspection – Customer Returns! • Cost??? Lecture Notes Product quality Properties 1. Electrical 2. Chemical 3. Physical 4. (Microstructure) 5. Mechanical • Hardness • Ductility • Dimensions • Surface Finish Quality inspection VS Process control • Quality Inspection keeps you form shipping bad parts. • Process control keeps you from making bad parts. Lecture Notes Lecture Notes objective • Learn basics of Surface Metrology • Learn basics of measurement Rationale- People pay for what they can measure - Much of the value in manufacturing is based on holding dimensions and surface finish to tolerance On the print 0.8 Ra, arithmetic average Optional additional information λ c = 0.25 Rz (DIN) 2.4 Grind Surface Metrology Objectives add value – reduce waste - science • Differentiate surfaces, by their textures, that are processed and that perform differently • Discover correlations between surface textures and functions – Understand the influence of processes on surface textures – Understand the influence of surface textures on performance • Depends on: – appropriate quantitative measurement and appropriate quantitative measurement and characterization of the texture characterization of the texture Lecture Notes Measurement system Surface (or replica) Measurement device Characterization Analysis (software)...
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This note was uploaded on 04/29/2008 for the course ME 1800 taught by Professor Brown during the Winter '08 term at WPI.

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L03Notes - Lecture 3 Product Quality Dimensional and...

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