Machine press
Machine tool that changes work-piece shape by pressure.
Qasinka · CC0
A machine press, also known as a forming 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 by mechanism (hydraulic, mechanical, pneumatic), function (forging, stamping, press brake, punch press), structure (knuckle-joint, screw, expeller), or controllability (conventional vs. servo-presses).
Historically, metal was shaped by hand using a hammer, with larger hammers later constructed to press more metal or thicker materials. A smith would often employ a helper to swing the hammer while focusing on positioning the work-piece. Drop hammers and trip hammers used a mechanism to lift the hammer, which then fell by gravity. In the mid-19th century, manual and rotary-cam hammers began to be replaced by the steam hammer, first described in 1784 by James Watt but not built until 1840 by James Nasmyth. By the late 19th century, steam hammers had grown greatly in size; an enhancement in 1891 allowed a steam hammer to deliver a 125-ton blow. Most modern machine presses typically use a combination of electric motors and hydraulics to achieve necessary pressure.
A common type is the shop press, 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. Used for general-purpose forming in auto mechanic shops, machine shops, or garages, typical shop presses apply between 1 and 30 tons. Lighter-duty versions are called arbor presses. Shop presses are commonly used to press interference fit parts together, such as gears onto shafts or bearings into housings. Other presses include the press brake, which bends sheet metal into shapes like brackets or electronic enclosures, with some having CNC controls for accuracy to a fraction of a millimeter and bending forces up to 3,000 tons. A punch press forms holes, a screw press is also known as a fly press, and a stamping press shapes or cuts metal by deforming it with a die. Capping presses form caps from rolls of aluminium foil at up to 660 per minute. A servo-press, driven by an AC servo motor, converts torque to linear force via a ball screw, with pressure and position controlled through a load cell and encoder; its main advantage is low energy consumption, only 1
- field
- Metalworking and manufacturing
- known_for
- Shaping metal and other materials through applied pressure
- types
- Hydraulic, mechanical, pneumatic; forging, stamping, press brake, punch press; knuckle-joint, screw, expeller; conventional, servo-press
Lore & Background
Machine presses, also known as forming presses, are machine tools that apply pressure to change the shape of a workpiece. Their appearance varies widely by type. A common shop press features a simple rectangular frame, often built from C-channel or tubing, housing a bottle jack or hydraulic cylinder that drives a ram to apply pressure. These are typically used for general forming in auto shops or garages and can exert between 1 and 30 tons. Lighter versions are called arbor presses. A press brake is a specialized press for bending sheet metal, often with CNC controls for high precision, and can apply forces up to 3,000 tons. Other types include punch presses for forming holes, stamping presses for shaping or cutting metal with a die, and screw presses (also known as fly presses). Capping presses form caps from aluminum foil at high speeds. The range of presses is classified by mechanism (hydraulic, mechanical, pneumatic), function (forging, stamping, bending), structure (knuckle-joint, screw, expeller), and controllability (conventional vs. servo-presses). Servo-presses, driven by an AC servo motor and ball screw, use a load cell and encoder for precise pressure and position control, consuming only 10-20% of the energy of other presses. Press frames are commonly gap-frame (C-frame) or straight-side. A C-frame allows access to the die area on three sides, while a straight-side press has vertical columns to eliminate angular deflection. The OBI (open back inclinable) press pivots its frame for easier part discharge. Safety features include bi-manual controls requiring both hands and light curtains that stop operation if an operator is near the die.
Reader's Guide
Machine presses are fundamental to modern manufacturing, enabling the mass production of shaped metal parts ranging from automotive components to electronic enclosures. Their significance lies in their ability to apply controlled force to deform materials with precision and repeatability. The development of servo-presses, which use an AC servo motor and ball screw, has reduced energy consumption to only 10–20% of other press machines. Press brakes can bend sheet metal with accuracy to a fraction of a millimeter, while stamping presses shape or cut metal using dies. Safety measures such as bi-manual controls and light curtains are essential to prevent accidents. The evolution from manual hammers to steam hammers and then to electric and hydraulic systems reflects the ongoing drive for greater force, efficiency, and control in industrial forming processes.
Did You Know?
- A shop press is commonly used to press interference fit parts together, such as gears onto shafts or bearings into housings.
- A servo press can reduce energy consumption by 30–50% or more compared to conventional presses.
- A press brake can form parts with accuracy to a fraction of a millimeter and bending forces exceeding 2,000 tons, with some industrial models reaching 3,000 tons or more.
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Frequently Asked Questions
What is a machine press?
A machine press, sometimes called a forming press, is a machine tool that reshapes a work-piece by applying force through pressure. It sits at the heart of metalworking and manufacturing operations where material must be deformed rather than cut away.
What types of machine presses exist?
Presses are sorted by power source (hydraulic, mechanical, or pneumatic), by task (forging, stamping, press brake, or punch press), by structural frame (knuckle-joint, screw, or expeller), and by control style (conventional versus servo-driven).
Who operates a machine press?
The person responsible for setting up and running a forming press is known as a press-tool setter, a title that most shops shorten to simply 'tool-setter.'
How does a machine press differ from a cutting machine tool?
Instead of removing chips like a lathe or milling machine, a press deforms the work-piece by forcing it against dies or through a forming mechanism. The applied pressure reshapes the material into the target geometry without necessarily removing any stock.
What makes a servo-press different from a conventional press?
Conventional presses follow a fixed mechanical or hydraulic cycle, whereas servo-presses use electric servo motors to precisely govern force, speed, and position at every point in the stroke. This gives the operator much finer, programmable control over the forming action.
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