SERVICES
PUNCH PRESSING
GENERAL INFORMATION ABOUT PUNCH PRESSES
Punch Press machines are a very widely used machine in the sheet metal processing industry,
where thin sheets can be cut quickly, economically, precisely and, unlike other cutting machines, punch presses can also form sheet metal.
The punch press machines, which have existed since the early times when cutting technologies were developed,
are in 3 groups as mechanical, hydraulic and servo driven.
Mechanical punch presses are the oldest type and their working principle is similar to eccentric presses.Their cutting costs are low,
they have a long life, but the position control of the ram is not possible unlike other types.
Hydraulic punch presses are the most common ones. The hydraulic system provides the punching force,
the position control of the ram is possible. They are quieter and more capable than mechanical systems,
but the maintenance costs are high and the probability of failure is higher due to the complexity of the system.
Servo driven systems are the latest technology. It is designed to eliminate the problems of mechanical and hydraulic machines.
The punching force is provided by one or more servomotors. The position control of the hammer can be done very precisely.
Compared to the other two systems, the stroke hit rates are much higher, since there is no heating problem,
this high speed can be used almost throughout the working period.
The movement of the sheet metal is done by connecting the sheet metal to the clamps. The motion of clamps are done by using ball screws and it is very quick and precise in both axes.
The tables, which sheet metal moves on top of, can be brushed or with steel balls, brushed plates are preferred for thin sheets and steel ball tables are preferred for thick sheets.
The workpiece size is limited in width, since it can reposition in length,
it can be larger than the length that the machine processes in one cycle.
CALCULATION OF PUNCHING FORCE
The punching force is related to the thickness of the sheet metal, the type of material,
and the dimensions of the punch tool. In addition, how sharp the dies are also important here, blunt dies will increase the calculated force.
F ( ton )=L∗τ∗t /1000
L: Total perimeter of the material being punched away(mm)
τ: Material Multiplier, 40 for steel, 25 for aluminum, 60 for stainless steel
t: thickness (mm)
WHEN SHOULD PUNCH PRESS BE PREFERRED?
Since the punch presses can cut with reasonable operating costs,
they are used in cutting processes where the cost is important.They are preferred
in special forming processes due to their ability to form unlike other cutting machines.
Punch presses have an important place in the air-conditioning, electrical panel manufacturing and
cabinet manufacturing where thin sheets are used.
