Power Presses
Power Presses
A press is a machine with a stationary bed and a guided slide (or ram) that reciprocates toward and away from it.
Presses are stroke-controlled devices.
Presses can be:
Mechanical Power Presses
Mechanical - Energy is stored in flywheel
Fast Production Rates
Capacity to 6,000 tons
Mechanical Press
Parts
Press Capacity
Tonnage
Shut Height or Daylight
Physical Size
Stroke
Adjustment of Ram
Speed - SPM
See note on shut height.
Note
The distance from the top of the bolster to the bottom of the slide (SDAU) is sometimes called the “shut height” but “die height” is the better term.
Be sure you know what shut height they are referring to.
Drive Configurations
Direct Drive
Single Gear Reduction
Multiple Gear Reduction
Hydraulic Press
Controlled Stroke
Smooth operation
Full tonnage available at top of stroke
Easy to control
High Capacity
Can have 50,000+ tons
(236 locomotives, See:https://en.wikipedia.org/wiki/Heavy_Press_Program)
Hydraulic presses can reverse mid-stroke
Hydraulic Press
Air/Oil presses
Servo Electric Press
Press Styles Gap or C-Frame
Gap Frame Presses
OBI - Open-Back Inclinable
OBS - Open-Back Stationary
ABS - Adjustable Bed Stationary
Horn Press
Deflection
C-Frames will deflect.
The result is misalignment of punch and die.
How much they deflect is the question.
Press Styles (Straight Side Press)
Limits die accessibility.
Deflection is in the direction of punching.
Clutches & Brakes
Connect/disconnect the crank mechanism to/from the flywheel
Stop the motion
Double Action Presses
For deep drawing operations
Have separate slides for
Ancillary Press equipment
Straighteners
Apply alternating compressive and tensile stresses on the material to relieve the plastic deformation that was developed during coiling.
Press Feeding
Die sets may be designed to accept blanks or coil stock.
Uncoilers
Strip Feeder
Types include:
Air Slide Feeds
Hydraulic Slide Feeds
Motor-Driven Slide Feeds
Roll Feeds
Can be push feed
Or
Pull feed (for thin material)
Scrap Cutter/Chopper
Die Cushion or Pressure Pads
Can be used for blank holder pressure
Can be used for liftout or knockout purposes to remove stampings from the die.
Fourslide Press
Press Brake
Power Press Safety
Guarding
Operation
Danger in Setup
Lockout/Tagout
Eliminating Sources of Energy (Die Safety Blocks)