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Machine press
 
 
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>press, or a machine press is a tool
Tool

A broad definition of a tool is an entity used to interface between two or more domains that facilitates more effective action of one domain upon the other....
 used to work metal
Metal

In chemistry, a metal is a chemical element whose atoms readily lose electrons to form positive ions , and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms....
 (typically steel
Steel

Steel is an alloy consisting mostly of iron, with a carbon content between 0.2% and 2.14% by weight , depending on grade. Carbon is the most cost-effective alloying material for iron, but various other alloying elements are used such as manganese, chromium, vanadium, and tungsten....
) by changing its shape and internal structure.

A forge press
Forge

A forge is the workplace of a smith or a blacksmith. A forge is sometimes referred to as a smithy.The basic smithy contains a forge, also known as a hearth, for heating metals....
 reforms the work piece into a three dimensional
Dimension

In mathematics, the dimension of a space is roughly defined as the minimum number of coordinates needed to specify every point within it. For example: a point on the unit circle in the plane can be specified by two Cartesian coordinates but one can make do with a single coordinate , so the circle is 1-dimensional even though it exists in...
 object—not only changing its visible shape but also the internal structure of the material. A stronger part results from this process than if the object was machined
Machine tool

A machine tool is a powered mechanical device, typically used to fabricate metal components of machines by machining, which is the selective removal of metal....
.

Bending is a typical operation performed and occurs by a machine pressing, or applying direct pressure, to the material and forcing it to change shape.






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Introduction

A press, or a machine press is a tool
Tool

A broad definition of a tool is an entity used to interface between two or more domains that facilitates more effective action of one domain upon the other....
 used to work metal
Metal

In chemistry, a metal is a chemical element whose atoms readily lose electrons to form positive ions , and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms....
 (typically steel
Steel

Steel is an alloy consisting mostly of iron, with a carbon content between 0.2% and 2.14% by weight , depending on grade. Carbon is the most cost-effective alloying material for iron, but various other alloying elements are used such as manganese, chromium, vanadium, and tungsten....
) by changing its shape and internal structure.

A forge press
Forge

A forge is the workplace of a smith or a blacksmith. A forge is sometimes referred to as a smithy.The basic smithy contains a forge, also known as a hearth, for heating metals....
 reforms the work piece into a three dimensional
Dimension

In mathematics, the dimension of a space is roughly defined as the minimum number of coordinates needed to specify every point within it. For example: a point on the unit circle in the plane can be specified by two Cartesian coordinates but one can make do with a single coordinate , so the circle is 1-dimensional even though it exists in...
 object—not only changing its visible shape but also the internal structure of the material. A stronger part results from this process than if the object was machined
Machine tool

A machine tool is a powered mechanical device, typically used to fabricate metal components of machines by machining, which is the selective removal of metal....
.

Bending is a typical operation performed and occurs by a machine pressing, or applying direct pressure, to the material and forcing it to change shape. A press brake is a typical machine for this operation.

An easy to understand type of machine press is a set of rollers. Metal is fed into the rollers, which are turning to pull the material through. The space between the rollers is smaller than the unfinished metal, and thus the metal is made thinner and/or wider.

Another kind of press is a set of plates with a relief, or depth-based design, in them. The metal is placed between the plates, and the plates are pressed up against each other, deforming the metal in the desired fashion. This may be coining
Coining (machining)

Coining is a form of precision stamping in which a workpiece is subjected to a sufficiently high stress to induce plastic flow on the surface of the material....
 or embossing or forming. A punch press
Punch press

A punch press is a type of machine press used for forming and cutting material. It can be small and manually operated and hold one simple Die set, or be very large, CNC operated, and hold a much larger and complex die set....
 is used for forming holes. Capping Presses form caps from rolls of aluminium
Aluminium

Aluminium or aluminum is a silvery white and ductile member of the boron group of chemical elements. It has the symbol Al; its atomic number is 13....
 foil at up to 660 per minute.

Progressive stamping
Progressive stamping

Progressive stamping is a metalworking method that can encompass punching, coining , bending and several other ways of modifying metal raw material, combined with an automatic feeding system....
 is a manufacturing method that can encompass punching, coining, bending and several ways of modifying the metal, combined with an automatic feeding system. The feeding system pushes a coil of metal through all of the stations of a progressive stamping die. Each station performs one or more operations until a finished part is made per the requirements on the print. The final operation is a cut-off operation, which separates the finished part from the carrying web. The carrying web, along with metal that is punched away in previous operations, is considered scrap metal.
Power Press Animation
A brake press
Brake press

A brake press is a Machine press used to bend, form or punch metal. It is a press that exerts a force on a set of dies. The force can be created by mechanical, hydraulic, electric or manual means....
 is a special type of machine press that bends sheet metal into shape. A good example of the type of work a brake press can do is the backplate of a computer case. Other examples include brackets, frame pieces and electronic enclosures just to name a few. Some press brakes have CNC controls and can form parts with accuracy to a fraction of a millimetre. These machines can be dangerous considering the knife-edge bending dies and forces in excess of However in the hands of a skilled operator the machine presents minimum hazard.

Machine presses are used extensively around the world for shaping all kinds of metals to a desired shape. A typical toaster (for bread) has a metal case that has been bent and pressed into shape by a machine press.

Machine presses can be hazardous, so safety measures must always be taken. Injuries in a press may be permanent, because of the large forces used. Bimanual controls (controls the use of which requires both hands to be on the buttons to operate) are a very good way to prevent accidents, as are light sensors that keep the machine from working if the operator is in range of the die.

Types of presses

  • Allsteel hydro-mechanical press
  • Pneumatic press
  • Knuckle-joint press
  • Hydraulic press
    Hydraulic press

    A hydraulic press is a hydraulics mechanism for applying a large lifting or compressive force. It is the hydraulic equivalent of a mechanical lever, and is also known as a Bramah press after the inventor, Joseph Bramah, of England....
  • Servo press
  • Fine blanking press
  • Forging press (Hammer press)
  • Screw press
    Screw press

    A screw press is a type of machine press in which the ram is driven up and down by a screw. The screw shaft can be driven by a handle, or a wheel....
     or fly press
  • Rack-and-pinion
    Rack and pinion

    A rack and pinion is a pair of gears which convert rotational motion into linear motion. The circular pinion engages teeth on a flat bar - the rack....
     press, for example, an arbor press
    Arbor press

    An arbor press is a smaller hand operated machine press. It is usually used to do smaller jobs, such as staking , riveting, installing and removing bearing and other press fit work....


History


Historically, metal was shaped by hand using a hammer
Hammer

A hammer is a tool meant to deliver an impact to an object. The most common uses are for driving Nail s, fitting parts, and breaking up objects....
. Later, larger hammers were constructed to press more metal at once, or to press thicker materials. Often a smith would employ a helper or apprentice to swing the sledgehammer
Sledgehammer

A sledgehammer is a tool consisting of a large, flat head attached to a lever . The head is typically made of metal. The sledgehammer can apply more impulse than other hammers, due to its large size....
 while the smith concentrated on positioning the workpiece. Adding windmill
Windmill

A windmill is a machine that is powered by the energy of the wind. It is designed to convert the energy of the wind into more useful forms using rotating blades or sails....
 or steam
Steam

In physical chemistry, and in engineering, steam refers to vaporized water. It is a pure, completely invisible gaseous phase . At standard temperature and pressure, pure steam occupies about 1,600 times the volume of an equal mass of liquid water....
 power yielded still larger hammers such as steam hammer
Steam hammer

A steam hammer is a power-driven hammer used to shape forgings. It consists of a hammer-like piston located within a cylinder. The hammer is raised by the pressure of steam injected into the lower part of a cylinder and falls down with a force by removing the steam....
s. Most modern machine presses use a combination of electric motors and hydraulics to achieve the necessary pressure. Along with the evolution of presses came the evolution of the dies
Die (manufacturing)

A die is a specialized tool used in manufacturing industries to cut, shape and form a wide variety of products and components. Like Molding and templates, dies are generally customized and uniquely matched to the product they are used to create....
 used within them.

Characteristics of 18 different types of presses


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Type of press
Open-back Gap Straight-side Arch Piller Solid Tie Rod Vertical Horizontal Inclinable Inclined Single Double Triple Crank Front-to-back crank Eccentric Toggle Screw Cam Rack and pinion Piston Over direct Geared, overdrive Under direct Geared, underdrive One-point Two-point Four-point Single Multiple Solid Open Adjustable
Bench
Open-back inclinable
Gap-frame
Adjustable-bed horn
End-wheel
Arch-frame
Straight-side
Reducing
Knuckle-lever
Toggle-draw
Cam-drawing
Two-point single-action
High-production
Dieing machine
Transfer
Flat-edge trimming
Hydraulic
Press brake