Punching or die cutting is a sheet metal forming method, which is always used if metal sheet or plate parts have to be made with recurring recesses, cutouts, louvres or Beads. If all the elements to be formed are the same, punching is superior to other cutting methods such as laser cutting in terms of production speed. This high speed results from the use of punching tools, which we have in stock in various shapes and sizes. We use these dies to punch the required elements out of the sheet metal.
Yet the secret does not only lie in the choice of die. Very large quantities of items can be produced because our punching machine is controlled by a computer. A CNC program, which is individually written for each product by our own CAD department, is copied onto the computer. So-called feeds are entered in this program. This means that the machine receives a command to move to a specific coordinate and to punch a required shape element out of the sheet or plate in this position.
If this has been done, the die moves automatically to the next coordinate. The time interval between two punching operations is so short that it can hardly be discerned by the human eye. Due to this extreme speed, large quantities of workpieces can be machined in a short time. Far less energy is also required for punching, as the material does not have to be melted. Die cutting is a purely mechanical process.
Fast machining times and reduced energy expenditure make die cutting a very efficient machining method.
The right tool
You need the right punching-tool to make openings in the desired dimensions. Punching tools consist of two parts. There is always a punching tool with a befitting die, perfectly fitting to each other in size and shape. Our punching machine is able to hold up to 17 different tools and can replace them automatically when needed.
In that way we can make elements in different shapes and sizes without stopping the machine.
Louvres, beads, recesses and openings – shaped elements in a jiffy!
Two tool parts are required for punching. These are called the punch and die. The punch has a positive form of the shaped element, the die the negative form. Rime has a large selection of different punch shapes and sizes. Tools that are circular, square or rectangular-shaped are most frequently used.
Our CNC machine can also work with multitools. The figures inserted above show the punch and die of a multifunctional tool. This tool has four different punch shapes, which can be changed automatically as and when required. Using these multitools increases the machining speed considerably, as there is no need whatsoever for retooling times.
The sheet metal part on the machine table is positioned between the two tools. The punch is positioned correctly and punches through the material powerfully. This process can be repeated as many times as necessary.
Advantages and disadvantages of punching
- It is a very fast and energy-saving process. There is no need for frequent machine retooling times, as our die cutting machine has a changer magazine. This means it can access four different tools fully automatically and produce diverse shapes.
- The only disadvantage is that not every shape can be punched. With punching we are tied to the punch shapes and tool sizes.
Nibbling is very similar to the punching process. The difference lies simply in the feed rate of the tool. The feed rate of the tool is smaller that the tool size. With overlapping punching processes it is possible to make louvres and beads in every demanded length. Every single punching process is leaving an imprint. The result of that is a a groove pattern at the edges. That pattern can be seen at the following pictures:
Nibbeln erweitert die Möglichkeiten des Stanzens ungemein, da Formelemente, die größer als das eigentliche Werkzeug sind, hergestellt werden können. Die Maschine kann außerdem ihre Werkzeuge beim Nachsetzen drehen, was die Formenvielfalt noch weiter erhöht.