Contents |
Introduction
A press, or a machine press is a tool used to work metal (typically steel) by changing its shape and internal structure. A goldsmith is a Metalworker who specializes in working with Gold and other Precious metals usually in modern times to make Jewelry. A broader 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 The M acro E xpansion T emplate A ttribute L anguage complements TAL, providing macros which allow the reuse of code across Steel is an Alloy consisting mostly of Iron, with a Carbon content between 0
A forge press reforms the workpiece into a three dimensional object—not only changing its visible shape but also the internal structure of the material. A forge is the workplace of a smith or a Blacksmith. A forge is sometimes referred to as a smithy. In mathematics the dimension of a Space is roughly defined as the minimum number of Coordinates needed to specify every point within it A stronger part results from this process than if the object was machined. 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 or embossing or forming. 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 A punch press is used for forming holes. A punch press is a type of Machine press used for forming and cutting material
Progressive stamping is a manufacturing method that can encompass punching, coining, bending and several ways of modifying the metal, combined with an automatic feeding system. Progressive stamping is a Metalworking method that can encompass Punching, coining, bending and several other ways of modifying Metal raw 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 cutoff 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.
A brake press is a special type of machine press that bends sheetmetal into shape. A brake press is a press used to bend form or punch metal It is a press that exerts a force on a set of dies
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 millimeter. These machines can be dangerous considering the knife-edge bending dies and powerful 100+ ton bending force. 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, since there can be over 100 tons of pressure coming down on a limb caught in the machine. 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
- Mechanical press
- Pneumatic press
- Knuckle-joint press
- Hydraulic press
- Servo press
- Fine blanking press
- Forging press (Hammers)
History
Machine presses started as a hand-held hammer banging away at a piece of metal to shape it to the desired form. A hydraulic press is a hydraulic mechanism for applying a large lifting or compressive force Forging is the term for shaping metal by using localized compressive forces A hammer is a tool meant to deliver an impact to an object The most common uses are for driving nails fitting parts and breaking up objects A hammer is a tool meant to deliver an impact to an object The most common uses are for driving nails fitting parts and breaking up objects Later, larger hammers were constructed to press more metal at once, or to press thicker materials. Adding wind or steam power allowed for stronger presses. Most modern machine presses use a combination of electric motors and hydraulics to achieve the necessary pressure. For the mechanical technology see Hydraulic machinery and Hydraulic cylinder Hydraulics is a topic of science and Engineering
Characteristics of 18 different types of presses
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Characteristics of 18 types of presses
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| Type of press |
Type of frame
|
Position
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Action
|
Method of actuation
|
Type of drive
|
Suspension
|
Ram
|
Bed
|
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of frame
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| 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 |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Open-back inclinable |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Gap-frame |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Adjustable-bed horn |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| End-wheel |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Arch-frame |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Straight-side |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Reducing |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Knuckle-lever |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Toggle-draw |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Cam-drawing |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Two-point single-action |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
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| High-production |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Dieing machine |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
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| Transfer |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Flat-edge trimming |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Hydraulic |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
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| Press brake |
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
|
X
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