Reading Assignment
Outline
Related Videos
- Automotive stamping line(video)
- Progressive die design (video)
- Transfer Press (video)
- Punch Press (video)
- SME – Sheet metal stamping presses and dies (video)
- Link motion press (video)
A common product produced by power presses is a progressive die stamping.
Two main types of presses
Gap-Frame or “C-Frame” Press
- OBI – Open-back inclinable
- OBS – Open-back stationary
Straight-Side Press
- Typically used for higher production volumes with higher precision required.
Mechanical Vs. Hydraulic
Mechanical
- Capacities to 6,000 tons
- Force varies throughout the stroke
- Limited/difficult overload protection
Hydraulic
- 50,000 + ton capacities
- Large force available at the top of the stroke
- Overload protection
How much is 50,000 tons?
GE AC6000 locomotice212.5 Tons (236 of these)
The Loewy 50,000 ton press during construction. One of eighteen columnar plates (circa 1954).
Rated capacity of a mechanical press is available only near the bottom of the stroke.
Double Action press concept (video)
Blankholder slide – on the outside
Draw slide – on the inside
Die Cushions (video)
Other Press Types
Hydraulic Forming
STAMPING PRESSES INTRODUCTION
Parts formed from sheet metal
MECHANICAL PRESSES INTRODUCTION
Gap-frame presses
Open back inclinable gap-frame
Open back stationary gap-frame
Straightside presses
Crown
Columns
Gibs
Bed
Bolster
Components of mechanical press
Flywheel
Gears
Clutch
Crankshaft
Pitman
Connection
Slide/Ram
Counterbalance
Brake
Direct drive
Single gear reduction
Eccentric gear presses
Double gear reduction
Clutch & brakes
Force capacity
High speed presses
HYDRAULIC PRESSES INTRODUCTION
Advantages of hydraulic presses
Press selection
PRESS CONTROLS INTRODUCTION
Types & uses of controls
PRESS FEEDING INTRODUCTION
Sheet metal blank feeding methods
Coil stock feeding methods
Coil line components
Uncoiler reel
Stock straightener/leveler
Scrap chopper
