A punch press is a type of machine press used to cut holes in material. It can be small and manually operated and hold one simple die set, or be very large Can use This Machine operated, with a multi-station turret and hold a much larger and complex die set.
This Machine Punching is a metal forming process that uses of CAM Mechanism AND a punch press to force a tool, called a punch, through the workpiece to create a hole via shearing. The punch often passes through the work into a die. A scrap slug from the hole is deposited into the die in the process. Depending on the material being punched this slug may be recycled and reused or discarded. Punching is often the cheapest method for creating holes in sheet metal in medium to high production volumes. When a specially shaped punch is used to create multiple usable parts from a sheet of material the process is known as blanking. In forging applications the work is often punched while hot, and this is called hot punching.
PUNCHING AND SHEARING
Shearing is similar to the process by which you cut a sheet of paper using scissors. However, the machinery used is a little different. The image below shows two typical machines used to cut sheet metal – the first is a shearing machine which has a long blade to make straight line cuts; it is used to cut long sheets of metal into smaller sheets. This operation is similar to that of a paper-cutting machine: the metal sheet is held on top of a hardened die, and the shearing blade cuts downward, usually driven by an electrical or hydraulic punch. The second image is a sheet metal punching machine – the cutting tool is a punch, a piece of hard tool steel which is punched down on the sheet to cut a hole. The punch in the image is a turret punch – the turret is a rotating tool holder that can hold tens of different shapes and sizes of punching dies. Typical shapes are rectangular and circular. By punching in a series of steps, a long slot can be cutout. A typical punching operation is similar to that of a paper punch that you may have used to cut holes to hold paper in a 3-ring binder.
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