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Concept
Machine press
Résumé
A forming press, commonly shortened to press, is a machine tool that changes the shape of a work-piece by the application of pressure. The operator of a forming press is known as a press-tool setter, often shortened to tool-setter.
Presses can be classified according to
their mechanism: hydraulic, mechanical, pneumatic;
their function: forging presses, stamping presses, press brakes, punch press, etc.
their structure, e.g. Knuckle-joint press, screw press, Expeller press
their controllability: conventional vs. servo-presses
Typically consisting of a simple rectangular frame, often fabricated from C-channel or tubing, containing a bottle jack or hydraulic cylinder to apply pressure via a ram to a work-piece. Often used for general-purpose forming work in the auto mechanic shop, machine shop, garage or basement shops, etc. Typical shop presses are capable of applying between 1 and 30 tons pressure, depending on size and construction. Lighter-duty versions are often called arbor presses.
A shop press is commonly used to press interference fit parts together, such as gears onto shafts or bearings into housings.
A press brake is a special type of machine press that bends sheet metal into shape. A good example of the type of work a press brake can do is the back-plate of a computer case. Other examples include brackets, frame pieces and electronic enclosures. Some press brakes have CNC controls and can form parts with accuracy to a fraction of a millimeter. Bending forces can range up to 3,000 tons.
A punch press is used to form holes.
A screw press is also known as a fly press.
A stamping press is a machine press used to shape or cut metal by deforming it with a die. It generally consists of a press frame, a bolster plate, and a ram.
Capping presses form caps from rolls of aluminium foil at up to 660 per minute.
A servomechanism press, also known as a servo press or an 'electro-press, is a press driven by an AC servo motor. The torque produced is converted to a linear force via a ball screw.
Source officielle
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