Material Selection For a Material Selection For a Camming HeadCamming Head
Project ParticipantsProject Participants
Scott EatonScott Eaton
Diane MaguireDiane Maguire
Don Bragg Don Bragg
Eric NewbergEric Newberg
Dan BrooksDan Brooks
Jared RecordJared Record
Peter GilbertPeter Gilbert
Jeremy Ouellette Jeremy Ouellette
Camming Head ObjectiveCamming Head Objective
Fill width of crackFill width of crack Prevent slippage Prevent slippage
of device when of device when loadedloaded
Hold Fixed Under Hold Fixed Under falling situation falling situation Dynamic Load of Dynamic Load of 13KN13KN
Camming Head FunctionCamming Head Function Maximize Frictional Forces Maximize Frictional Forces
By Optimizing Head ShapeBy Optimizing Head Shape Maximize Working Surface Maximize Working Surface
AreaArea Maximize grip of Head to Maximize grip of Head to
RockRock
Constraints For Material Constraints For Material SelectionSelection
High Fracture High Fracture toughnesstoughness
High Strength to High Strength to weight ratioweight ratio
DuctileDuctile FormableFormable ManeuverableManeuverable
Aluminum 6061-T6Aluminum 6061-T6
6000’s Main Components of 6000’s Main Components of Magnesium and SiliconMagnesium and Silicon
T6 Temper Designation That T6 Temper Designation That Solution Is Heat Treated and Solution Is Heat Treated and Artificially AgedArtificially Aged
Heat TreatmentHeat Treatment
Magnesium and Magnesium and Silicon are Silicon are dissolved forming dissolved forming a “Solid-Solution” a “Solid-Solution”
Elements fuse to Elements fuse to become an alloy.become an alloy.
Artificial AgingArtificial Aging
Strengthening Strengthening Mechanism Mechanism Equivalent to Equivalent to Precipitation Precipitation HardeningHardening
Precipitate Will Precipitate Will form around grain form around grain structure leading structure leading to fewer slip to fewer slip planesplanes
Resulting Aluminum AlloyResulting Aluminum Alloy
Fracture ToughFracture Tough Strong and lightStrong and light DuctileDuctile FormableFormable
Alternative 7075-T6Alternative 7075-T6
Lower Fracture Lower Fracture ToughnessToughness
Higher Strength Higher Strength Weight RatioWeight Ratio
Harder Surface-Harder Surface-Less WearLess Wear
Why 6061-T6 AluminumWhy 6061-T6 Aluminum
Softness Softness Advisable Advisable
Experimentally Experimentally better against better against slippage slippage
More Ductile less More Ductile less chance of blowoutchance of blowout
ReferencesReferences http://Web.mit.edu/custer/www/ rocking/cams/cam.htmlhttp://Web.mit.edu/custer/www/ rocking/cams/cam.html http://www.matweb.comhttp://www.matweb.com http://elvis.engr.wisc.edu/uer/uer96/ author2/content.htmlhttp://elvis.engr.wisc.edu/uer/uer96/ author2/content.html Van Vlack, Lawrence H., Van Vlack, Lawrence H., Elements of Materials Science Elements of Materials Science
and Engineeringand Engineering, fourth edition, Addison-Wesley , fourth edition, Addison-Wesley Publishing, 1980.Publishing, 1980.
Flinn, Richard A. and Trojan, Paul K., Flinn, Richard A. and Trojan, Paul K., Engineering Engineering Materials and Their ApplicationsMaterials and Their Applications, Houghton Mifflin, Boston, , Houghton Mifflin, Boston, 1975.1975.
DeGarmo, E. Paul, Black, J. Temple and Kohser, Ronald A., DeGarmo, E. Paul, Black, J. Temple and Kohser, Ronald A., Materials and Processes in ManufacturingMaterials and Processes in Manufacturing, Macmillian , Macmillian Publishing, 1988.Publishing, 1988.