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An experimental study on the examination of springback of sheet metals with several thicknesses and properties in bendin PowerPoint Presentation
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An experimental study on the examination of springback of sheet metals with several thicknesses and properties in bending dies. Zafer Tekiner Accepted 25 July 2003 Presented by Jared Moyer September 22, 2004. Bending Background. Used anciently-5000 BC Utensils and jewelry

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An experimental study on the examination of springback of sheet metals with several thicknesses and properties in bending dies

Zafer Tekiner

Accepted 25 July 2003

Presented by Jared Moyer

September 22, 2004

bending background

Bending Background

Used anciently-5000 BC

Utensils and jewelry

A common shaping process today

Seams, flanges

Automotive-car bodies

Aircraft fuselages

Beverage can

Metal desks

advantages
Advantages
  • Low cost
  • Good strength
  • Light weight
  • Formability characteristics
      • no necking or tearing
  • Versatile shapes
disadvantages
Disadvantages
  • Cracking
  • Springback
    • Sheets
    • Rod
    • Wire
    • bars

SB = (A’ – Ab’)/ Ab’

reducing springback
Reducing Springback
  • Over bending part
  • Elevated temperatures
  • Bottoming the punch
      • High-localized compressive stresses between the punch and die surface
  • Stretch bending
      • Part is in tension while being bent
purpose of paper
Purpose of Paper
  • Find a springback values
    • Bending die designers
    • Acceptable tolerances
  • Experimental methods
      • Time
      • Money
test set up
Test Set Up
  • Several materials: Steel, Copper, Brass, Aluminum, Galvanized and stainless steels
  • Dimensions: 25 mm x 50 mm
  • Different thicknesses: .5, .75 & 1.00 mm
  • Measured bending by optical profilometer (1 min)
  • Used four different methods
  • Results graphed by Microsoft Excel software
forces needed
Forces Needed
  • Force Equations
    • C = 1 + (4*T/W)
    • P*v = C (B*T^2*dd*b-/W) x 10
method 1
Method 1
  • Punch doesn’t touch die corners
  • Gap thickness between punch and die equaled to sheet metal thickness
  • Punched left for 20 sec.
  • Repeated each material and thickness
method 2
Method 2
  • Punch on the sheet metal
  • No maintaining load
method 3 and 4
Method 3 and 4
  • Method 3
    • No gap between punch and die
    • Load left for 20 sec
  • Method 4
    • No gap between punch and sheet metal
    • No holding load
  • Results
    • Too complicated
    • Crushing material
    • Depth of descending punch not considered
conclusions
Conclusions
  • Changed with material and die
  • Reduced by leaving loads
  • Developed equations help produce more precise results
my conclusions
My conclusions
  • Are the springback values valid with multiple bends?
  • Experiments have been preformed
  • Machinists use charts
references
References
  • Fundamentals of Modern Manufacturing, Mikell P. Groover
  • Manufacturing Engineering and Technology, Kalpakjan and Schmid