2 Presses & Eqipments

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Chapter 3

Presses and Equipmentfor Sheet Metal dies


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Power Press Types

Presses are classified by

Type of frame

Source of powerMethod of actuation of slidesNumber of slides

IncorporatedIntended use


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Open Back Inclined Press

Classified by Frame


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Single action

straight sideeccentric shaft

mechanical

press.

Classified by rame


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Basic Types of Mechanical Press !ri"esGear driven presses transmit the energy of the

flywheel through a single or double reduction gear.

The single reduction gear drive is suited for heavier

blanking operations or shallow drawing. The

double-gear drive is used on large, heavy presses

where it is necessary to move large amounts of

mass at slower speeds. The double reductiongreatly reduces the strokes per minute without

reducing the flywheel speed. Next Fig. shows the

basic types of mechanical drives.


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Classification by

Source of power

Basic Types of Mechanical Press Drives

Nongeared

Single geared

Single reduction gear

Double reduction gear drive


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#ydraulic Press

Hydraulic presses have a large cylinder and piston,

coupled to a hydraulic pump. The piston and press ramare one unit. The tonnage capacity depends upon the

cross-sectional area of the piston (or pistons and the

pressure developed by the pump. The cylinder is double

acting in order to move the ram in either direction. The

advantage of a hydraulic press is that it can e!ert its full

tonnage at any position of the ram stro"e. #n addition, the

stro"e can be varied to any length $ithin the limits of the

hydraulic-cylinder travel. The speed and pressure are also

constant throughout the entire stro"e. Ne!t %ig. sho$s a

typical hydraulically driven press.


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Typical double

actionhydraulic press

with a

Die cushion

#ydraulic Press


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$eneral Press Information

Press tonna%e

Stroke

Shut hei%ht

!ie space


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Material #andlin% Equipment

Material Handling Euipment

Strip!straightening de"ices

Strip Feeding Euipment

Slide Feeder


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#npowered plaincoil!winding reel


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Motor dri"encoil!winding reel


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Power operated coil cradle with straighteningrolls and a loop control arm$ supplying coil

stoc% to a double roll feed in a gap frame press


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& combination straightening machine

and coil cradle

!rinciple of straightening devices


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& Single 'oll

Feed

Mounted on

()* Press


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Combination Feeding and Straightening machine


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Slide or Hitch Feeding Mechanism

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Stac%ing Mechanism

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stac%ing Chute

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