The press represents a precise type of machine tool essential
in the performance of industrial manufacturing processes. The presses deliver
energy through a force that acts on a distance or blow. An important
application is in the manufacture of metal forging. Press energy is used to
close the die, forging the inside. Pressing machine tools apply force / energy
to work differently from drop hammers (which deliver energy to work through a
collision), hammers are the other kind of machine tools used to forge metal
parts. The fall hammers are covered on the previous page. This page will cover
different types of pressing machines, their function and capabilities, although
it is located in the metal slab section, the slab is just one class of
manufacturing processes that use presses.
Pressing machines are also the main machine tool used in the
processes of metal extrusion and sheet metal fabrication. Hydraulic and
mechanical presses are used during sheet metal formation to the extent that
sheet metal processes, in general, are often referred to as press work. Presses
can be used in the manufacture of plastic parts. Machining operation such as broaching,
May also requisite presses.
Press machine tools vary in size and in the amount of force
they can produce. The energy of a press is often used to perform jobs that
require an enormous amount of force, such as a large amount of plastic
deformation of a considerable piece of metal. The method and nature by which a
press machine will deliver its energy will vary, depending on its type.
The machine presses shown here are vertical, which means
that the force vector is up and down in relation to gravity. In many cases,
these same types of machines are used horizontally, which means that the force
is delivered in a path perpendicular to the direction of the force of gravity.
If the force is exerted vertically, horizontally or at some intermediate angle,
the operating principles of each type of machine tool are the same.
Press machine tools are of two main types, Hydraulic Press Machine and Mechanical Press Machine. The selection
of a type of press machine depends on the factors of the manufacturing process.
The first consideration would be the basic type of process for which the press
tool will be used. For example, a metal forging press, an extrusion press, an
impact extrusion press or a sheet metal working press will have different
general requirements. The next very important factor in the selection of
machine presses for a manufacturing operation is the required pressing
capacity. The press capacity required is probably related to the size of the
work stock and the type of process. The length of the stroke on which the press
exerts force is another main factor when choosing a press machine tool, this
will also is related to the basic type of process being used. These initial
considerations should give an immediate idea of the general type of press requisite.
After this, all the specific factors of the manufacturing process must be
weighed to determine the best option for a pressing machine tool.
Hydraulic Press Machine
Hydraulic Press
Machine is a powerful class of machine tools. They acquire the energy they
deliver through hydraulic pressure. The fluid pressure, in a particular
chamber, can be increased or decreased by the use of pumps and valves.
Sometimes devices and systems can be used to intensify the capacity of pumps in
more substantial presses. These presses can operate at a long distance and at a
constant speed. Hydraulic Press Machine
is generally slower in relation to other types of pressing machines. This
implies a longer contact with the work; therefore, the cooling of the work can
be a problem when forming a part with hot hydraulic force. Hydraulic presses
are capable of being the most powerful kind of presses. Some can be as large as
buildings and can generate impressive pressure. The largest hydraulic presses
are capable of applying 75,000 tons (150,000,000 lbs) of force. The hydraulic
press shown is being used to make a metal forge. Extrusion is also a very prevalent
use for such a press, although extrusion is often performed horizontally.
The basic operating principles of the hydraulic press are
simple and depend on the differences in fluid pressure is follow by Hydraulic Press Machine Manufacturer. The fluid is pumped to the cylinder under
the piston; this increases the pressure of the fluid under the piston.
Simultaneously, the fluid is pumped out of the upper channel, which causes the
fluid pressure on the piston to decrease. A higher pressure of the fluid below
the piston than the fluid above causes the piston to rise. In the next step,
the fluid is pumped from under the piston, which causes the pressure under the
piston to decrease. Simultaneously, the fluid is pumped to the cylinder from
the top, which increases the pressure of the fluid above the piston. A higher
pressure of the fluid on the piston, than the fluid under it, moves the piston
down.
Mechanical Press Machine
Mechanical presses belong to a class of machine tools that
cover a wide range of different types of machines. Mainly the mechanical press transmute
the rotational force of an engine into a translation force vector that performs
the pressure action. Therefore, the energy in a mechanical press comes from the
engine. These types of presses are generally faster than hydraulic or screw
presses (in fact, the screw press can also be classified as a mechanical
press). Unlike some presses, in a mechanical press, the application of force
varies both in speed and in magnitude along the distance of the blow. When
performing a manufacturing operation with a mechanical press the precise range
of the stroke is essential.
Presses are designate based on the characteristics of the
manufacturing process. Machine tools of mechanical presses are commonly used in
the manufacture of metal forging and in sheet metal work. The desired force
application will determine the type of machine required. Extrusion will often
require a more consistent force over a longer distance. However, a mechanical
press can often be a good option for impact extrusion, since a rapid and
quickly repeatable application of force over a limited distance is what is
needed for that type of manufacturing process. The most powerful mechanical
presses in the modern manufacturing industry will have a pressing capacity of
approximately 12,000 tons (24,000,000 lbs).
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