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Sheet Metal Bending

Sheet Metal Bending. Historical Note;. Sheet metal stamping was developed as a mass production technology for the production of bicycles around the 1890’s. This technology played an important role in making the system of interchangeable parts economical (perhaps for the first time). .

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Sheet Metal Bending

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  1. Sheet Metal Bending

  2. Historical Note; Sheet metal stamping was developed as a mass production technology for the production of bicycles around the 1890’s. This technology played an important role in making the system of interchangeable parts economical (perhaps for the first time).

  3. Stress Strain diagram – materials selection

  4. Basic Sheet Forming Processes(from http://www.menet.umn.edu/~klamecki/Forming/mainforming.html) Shearing Drawing Bending

  5. Shear and corner press

  6. Sheet T Punch D Die Part or slug Shearing Operation Force Requirement F = 0.7 T L (UTS) T = Sheet Thickness L = Total length Sheared UTS = Ultimate Tensile Strength of material

  7. Shearing of sheet metal between two cutting edges

  8. Schematic of a Blanked Edge

  9. Workpiece Die Bending Force Requirement Force Punch T = Sheet Thickness W = Total Width Sheared (into the page) L =Span length UTS = Ultimate Tensile Strength of material T L Engineering Strain during Bending: e = 1/((2R/T) + 1) R = Bend radius Minimum Bend radius: R = T ((50/r) – 1) r = tensile area reduction in percent

  10. Bending of sheet metal;both compression andtensile elongation

  11. Springback • Over-bend • Bottom • Stretch

  12. Pure Bending tension compression Bending & Stretching

  13. Springback

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