Burr (edge)

When deburring edges are removed. Burrs are sharp, resulting in a processing or manufacturing operation edges, fraying or fragmentation of a mostly metallic workpiece, of which severe injury may arise.

The term " deburring " is mainly used in the metalworking industry. In the woodworking industry is called the edge- breaking, mostly by means of sandpaper. When a defined chamfer is formed in the removal of the burr on the edge, it is called this bevel.

Creation of the ridge

For mechanical operations, such as milling or turning parts produced at a burr edges by material displacement.

In the processing of sheet metal burrs when punching, rarely also in laser cutting, especially when the focus of the laser beam is not true. Thicker sheets to be cut by the plasma or autogenous. This may lead to very strong ridge and slag formation.

Entgratungsmethoden

Burrs are removed by brushing, filing, Countersink, grinding, milling, grinding, thermal deburring ( eg thermal explosion Machining, TEM), electrochemical deburring, Hochdruckwasserstrahlentgraten, pressure flow (DFL ), hydroerosives loops ( HE- loops) or cutting.

It is also possible to immerse the workpiece in caustic or corrosive liquids or heat it in order to defuse the edges.

Small thick workpieces are often trimmed with the drum ( machine ), small thin sheets rather the so-called mass finishing process.

For larger sheets, there are run machines which run through the sheets under a grinding unit, which abrades the upstanding ridge. Since the plates are often distorted by the thermal cutting, it is especially important to work with a flexible sanding unit, the tolerances and the delay offsets. In general, the softer the grinding unit, the more grinding results in the edge region (where the burrs ) and the less on the surface.

Cross holes can be trimmed with the HSD method (High Speed ​​Deburring ).

Deburring plastics

Molded plastic parts often have a ridge. They are mostly cut with special knives, sometimes sanded. Since plastic parts when they are still slightly warm, noticeably softer than after curing, this is usually no problem. For plastics it is also an automated deburring with hot air. Here, the flash material is melted, the surface tension of the round material.