Material Selection For a Camming Head

1
Material Selection For a Camming Head

• Project Participants
• Scott Eaton
• Diane Maguire
• Don Bragg
• Eric Newberg
• Dan Brooks
• Jared Record
• Peter Gilbert
• Jeremy Ouellette

2
Camming Head Objective

• Fill width of crack
• Prevent slippage of device when loaded
• Hold Fixed Under falling situation Dynamic Load
  of 13KN

3
Camming Head Function

• Maximize Frictional Forces By Optimizing Head
  Shape
• Maximize Working Surface Area
• Maximize grip of Head to Rock

4
Constraints For Material Selection

• High Fracture toughness
• High Strength to weight ratio
• Ductile
• Formable
• Maneuverable

5
Aluminum 6061-T6

• 6000s Main Components of Magnesium and
  Silicon
• T6 Temper Designation That Solution Is
  Heat Treated and Artificially Aged

6
Heat Treatment

• Magnesium and Silicon are dissolved forming a
  Solid-Solution
• Elements fuse to become an alloy.

7
Artificial Aging

• Strengthening Mechanism Equivalent to
  Precipitation Hardening
• Precipitate Will form around grain structure
  leading to fewer slip planes

8
Resulting Aluminum Alloy

• Fracture Tough
• Strong and light
• Ductile
• Formable

9
Alternative 7075-T6

• Lower Fracture Toughness
• Higher Strength Weight Ratio
• Harder Surface-Less Wear

10
Why 6061-T6 Aluminum

• Softness Advisable
• Experimentally better against slippage
• More Ductile less chance of blowout

11
References

• http//Web.mit.edu/custer/www/ rocking/cams/cam.ht
  ml
• http//www.matweb.com
• http//elvis.engr.wisc.edu/uer/uer96/
  author2/content.html
• Van Vlack, Lawrence H., Elements of Materials
  Science and Engineering, fourth edition,
  Addison-Wesley Publishing, 1980.
• Flinn, Richard A. and Trojan, Paul K.,
  Engineering Materials and Their Applications,
  Houghton Mifflin, Boston, 1975.
• DeGarmo, E. Paul, Black, J. Temple and Kohser,
  Ronald A., Materials and Processes in
  Manufacturing, Macmillian Publishing, 1988.