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.