DRAGON INNOVATION, INC. !
DESIGN FOR MANUFACTURING !
COURSE 8: PART 2 - STAMPING !!!!!!!
SCOTT N. MILLER | CEO | @DRAGONINNOVATE | WWW.DRAGONINNOVATION.COM
•Overview •Process •Part Design •Materials
AGENDA
Stamping Overview
Typical Stamped Parts
• Brackets
• Deep Draw Containers
• Fittings
Stamping Advantages
• Suitable for high volume production • Short cycle times • Cost effective components
• Feature integration • High precision • Can create large components
Stamping Disadvantages
• Tooling is expensive with a long lead-time • Difficult to make changes or prototype • Limited to metals • Limited by ductility of the material • Stamped edge rough finish
Stamping Process
Stamping Process
• Processes: - Stretch - Compress - Form - Bend - Cut - Pierce
• Features: - Lance - Depression - Flange - Hem - Emboss
Punching Example
Stamping Action
https://www.youtube.com/watch?v=2ph3AOxvcR4
Progressive Die Stamping
https://www.youtube.com/watch?v=tISCf9WmRzw
Deep Draw
https://www.youtube.com/watch?v=n0s_UEwC43U
Stamping Part Design
Design Guidelines
• Use parallel edges if possible. • Avoid narrow sections and small holes (weak tool).
– Hole diameter >20% stock thickness. For SS, use 2x. – Notches and tabs: W > 1.5T, L < 5T
• Thickness between 0.1 mm - 16 mm • Use planes, cylinders or cones in bend area. • General rule: Inside bend radius equal to material
thickness. For 6061, use 6x material thickness. • Parts will lengthen during bending due to plastic
deformation. Look up “K” factor for more info.
Edge Distortion
Flanges
• Min width > 2.5T + R
2.5T + R
Edge Holes
• Distance between hole and edge > 2T
If < 2T
Displacement
Cut Slot, or Add Arch
Bend Relief
• Steel: A366 • Stainless: 304 & 316 • Aluminum: 3003-H14 & 5052-H32
Common Materials