lecture3 - http/ocw.mit.edu MIT OpenCourseWare 2.830J...

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MIT OpenCourseWare ____________ http://ocw.mit.edu 2.830J / 6.780J / ESD.63J Control of Manufacturing Processes (SMA 6303) Spring 2008 For information about citing these materials or our Terms of Use, visit: ________________ http://ocw.mit.edu/terms .
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Control of Manufacturing Processes Control of Manufacturing Processes Subject 2.830/6.780 Spring 2008 Lecture #3 “Process Variation – Physical Causes and Interpreting Data” February 12, 2008 Subject 2.830/6.780 Spring 2008 Lecture #3 “Process Variation – Physical Causes and Interpreting Data” February 12, 2008
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2.830J/6.780J Lecture #3 © David E. Hardt 2 M anufacturing Agenda • Process Definitions – Geometry Change Causality • Taxonomy for Control – Classification of Change Methods • “Mechanical” Examples – Turning – Bending – Molding • Origins of Variation – States and Properties
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2.830J/6.780J Lecture #3 © David E. Hardt 3 M anufacturing Process Model for Control Equipment Material E ( t ) “controls” Geometry & Properties Y = Φ ( α ) process parameters What are the α s? Process Y Process Outputs
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2.830J/6.780J Lecture #3 © David E. Hardt 4 M anufacturing Back to the Process: What Causes the Output Change? • A Directed Energy Exchange with the Equipment Equipment Material E ( t ) Geometry & Properties E ( t ) mechanical electrical thermal chemical
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2.830J/6.780J Lecture #3 © David E. Hardt 5 M anufacturing Modes of Geometry Change? Removal of Material • Plastic Deformation of Material Addition of Material Formation of Material from a Gas or Liquid • Any others???
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2.830J/6.780J Lecture #3 © David E. Hardt 6 M anufacturing – location of max. shear stress in turning location of max. shear stress in turning What Controls the Geometry Change? Location and Intensity of Energy Exchange Location and Intensity of Energy Exchange Examples Examples :
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2.830J/6.780J Lecture #3 © David E. Hardt 7 M anufacturing What Controls the Geometry Change? Location and Intensity of Energy Exchange Location and Intensity of Energy Exchange • Examples Examples : – heat transfer at the mold surface in injection molding heat transfer at the mold surface in injection molding
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2.830J/6.780J Lecture #3 © David E. Hardt 8 M anufacturing – location of laser beam in laser cutting Location and Intensity of Energy Exchange Location and Intensity of Energy Exchange Examples Examples : Control of Geometry Change?
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2.830J/6.780J Lecture #3 © David E. Hardt 9 M anufacturing – reaction rate reaction rate - time product on substrate surface in LPCVD time product on substrate surface in LPCVD Location and Intensity of Energy Exchange Location and Intensity of Energy Exchange Control of Geometry Change?
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2.830J/6.780J Lecture #3 © David E. Hardt 10 M anufacturing Control of Geometry Change? Location and Intensity of Energy Exchange Location and Intensity of Energy Exchange displacement field in sheet forming :
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2.830J/6.780J Lecture #3 © David E. Hardt 11 M anufacturing Two Extremes of Interactions Area of E(t) << Total Area: Serial Process Area of E(t) ~ Total Area: Parallel Process v(t) y(t) K(s)
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2.830J/6.780J Lecture #3 © David E. Hardt
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lecture3 - http/ocw.mit.edu MIT OpenCourseWare 2.830J...

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