Blisk

The word blisk is an English shorthand for " blade integrated disk", even " integrally bladed rotor" (IBR ), called the combination of the words Blade ( blade ), and disk ( disc ) is composed. It refers to a component that is used in engine and turbine. By replacing up to 120 individual blades per disc by a blisk eliminates the installation costs. Furthermore, this process is achieved by a significant weight saving, which is particularly important in the aviation field of great interest. Especially less stressed components can be replaced by bladed disks.

Only by computer-controlled cutting machines Blisks can be produced. Basis of a blisk is a forged disc, from whose outer contour by machining the blade profiles are developed. Another possible production method is the placement of the blade profiles by friction welding. The discs of the compressor side is usually made of titanium, whereas the turbine disks are made on the turbine side usually made of a surface- hardened steel / nickel alloy.

In contrast to the replacement of individual blades renewing a blisk is very complex and expensive. Therefore worn Blisks are increasingly being repaired with metal -applying methods such as the laser cladding. Another method of repairing the blisk is friction welding. Here a damaged or worn blade from the blisk is disconnected and replaced by friction welding with a new shovel.

In newer aircraft engines also Blisks come from composite materials used.