L- 11 Fixturing

L- 11 Fixturing - Deforms workpiece Stress and strain

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Fixturing ME1800
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Objectives Introduce fixturing tools available in the WPI labs Introduce the influence of fixturing on the finished geometry of manufactured parts Introduce how fixturing will influence surface quality of manufactured parts
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fixturing can influence value and cost in manufacturing Just because you can draw it does not mean you can cut it Just because the cutter can create the shape does not mean you can fixture it Fixturing needs to be designed
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Applications Forging (heading) Heat treating Coating Assembly Soldering Welding Cleaning Polishing Grinding Machining
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Fixturing research (machining) Prof. Rong, WPI Adaptive fixturing for families of similar parts
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Kinematics Position and orientation – location 3-2-1 3 points for a plane – primary location 2 points for a line on the plane – secondary location 1 point for position on the line – tertiary location
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Kinetic Force and deformation Hold part to resist machining forces
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Unformatted text preview: Deforms workpiece Stress and strain http://www.mse.cornell.edu/courses/engri111/modulus.htm stress strain Elastic modulus Vice fixture machine a pocket N w o w 1 Frictional force F=N W 1 = W o + W o (N/AE) A Stress = = N/A Friction coefficients http://www.roymech.co.uk/Useful_Tables/Tribology/co_of_frict.htm material1 material2 static dynamic Aluminum Aluminum 1.05-1.35 1.4 Aluminum mild steel 0.61 0.47 Cantilever Beam deflection Deflection y max = FL 3 /(3EI) http://physics.uwstout.edu/statstr/Statics/Beams/bdsnp412b.htm Area moment of inertia (I) Rectangle I=(1/12) bh 3 Circle I=r 4 /4 http://www.roymech.co.uk/Useful_Tables/Form/M_of_Inertia_2.html Elastic modulus steel Elastic modulus aluminum E=30,000,000 psi E=10,000,000 psi F F b h r L Final diameter at far end D e = 2(r- doc + y max ) = 2(r - doc + 4FL 3 /(3E r 4 ) Walker Magnetics, Worcester, MA http://www.walkermagnet.com/mag/index.html Magnetic chucks...
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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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L- 11 Fixturing - Deforms workpiece Stress and strain

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