Leather punch

The hole iron ( iron rash, even punching iron ) is a hole tool. It is used as a cutting tool to separate out in accordance with the punch -shaped elements in the shearing process of a workpiece.

It is a short hollow cylinders - the so-called hole pipe - made ​​of hardened steel, which sent ground sharp at the bottom and top with a stem is ( the shaft ) provided. Punches put it out perpendicular to the workpiece and strikes with a hammer ( hand or mechanically ) on the shaft, so that the sharp edge of the hole iron can penetrate into the workpiece.

We distinguish:

• Round punch ( hole whistle narrow sense, because of the similarity to the tone generator pipe), cutting with cylindrical shank in one piece, in which the core hole of the round cutting in a side ejection port opens
• Henkellocheisen are hand tools with a conical punch head on two vehicles, caused by the two-sided recess
• Form Punches are punches with a special, non-circular geometry ( oval, rectangular, and many others. )
• Kappeisen called specifically in leather processing such form punch, with which one can produce slots with rounded ends, eg for fastening buckles in belts.

There are many variations of special tools and tool bits, depending on the material, as well as tools with central Auswerfstempel, which ejects the die-cut piece forwards.

Punch is used for punching leather, cardboard and paper, tarpaulins and mats of textile, rubber, plastics, and the like. In the timber industry to use the hole punch to separate out round pieces of thin wood flakes. Puncher ( Blechaushauer ) are used for burr-free punching holes in sheet metal such as aluminum, insulation tube, brass or soft steel. Furthermore, they are used for the production of seals, as a tool in an operation during riveting, and when stamping in such materials. Commercial Punches are usually conically ground on the outside. When punching seals made of paper or other hard materials, a burr is thereby raised edge of the hole; it, it is to use a cylindrical or tapered inner ground punch would be more favorable.