sheet metal bending
DESCRIPTION
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). . - PowerPoint PPT PresentationTRANSCRIPT
Sheet Metal Working
Apiwat Muttamara
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).
Stress Strain diagram
A
BC
Basic Sheet Forming Processes(from http://www.menet.umn.edu/~klamecki/Forming/mainforming.html)
Shearing
Bending
Drawing
Shearing of sheet metal between two cutting edges
Schematic of a Blanked Edge
Blanking & Punching(Piercing)
Shearing Operation Force Requirement
Die
SheetPunch T
D
Part or slug
F = 0.7 T L (UTS) T = Sheet ThicknessL = Total length ShearedUTS = Ultimate Tensile Strength of material
F = T L (Shear Strength)
MPa= ? 10.1 kg/cm2
Bending Force Requirement
PunchWorkpiece T
Die
L
Force
T = Sheet ThicknessW = Total Width Sheared
(into the page)L =Span lengthUTS = Ultimate Tensile Strength of material
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
)(2
UTSLWTF
Minimum Bend radius: R = T ((50/r) – 1)
r = tensile area reduction
in percent
Engineering Strain during Bending: e = 1/((2R/T) + 1)R = Bend radius
Bending of sheet metal;both compression and
tensile elongation