Machine Press

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press Introduction A press, or a machine press is a tool used to work metal (typically steel) by changing its shape and internal structure.

A forge reforms the workpiece into a Dimension 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 machine tool.

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 (machining) or embossing or forming. A punch press is used for forming holes.

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. 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 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 have a high hazardous level, so safety measures must always be taken. Injuries in a press may be permanent, since there are over 100s tons on top of a limb. Bimanual controls (both hands need to be on the buttons to make the press work) are a very good way to prevent accidents. Also light sensors that keep the machine from working if the operator is in range of the die (tool that goes inside the press to shape metal), or any limbs is in range.

Types of Presses

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. 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.

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