Friction drilling

Drilling a drilling fluid of metalworking which holes formed without cutting by plasticization of the material.

Principle

The aim is to plasticize the material to be processed. This is achieved by the axial force and high speed, creating friction. This friction causes a local heat of about 600 ° C and in conjunction with a high surface pressure, the plasticization of the material is achieved.

Process flow

In the first step the rotating Fließbohrwerkzeug is hired on the material to be machined and pressure generated by the friction effort required. The material heats up and the flow drill the hole formed by the resulting plasticization of the material.

Tools

Flowdrill there are basically two different types. The standard type leaves when drilling a bead on the surface of the material, which has arisen from the displacement of the material in the plasticized state. The flat - type removes the bead by cutting and leaves a flat surface. Flowdrill need a collet chuck for inclusion in an appropriate machine. This collet chucks have spoke ventilation to dissipate the high heat, which can damage the machine under certain circumstances.

Pros and Cons

The advantage, or rather the real meaning of the floating drilling results from the resulting bead on the inside of the hole. One thus has enough material available to cut a larger bearing thread into a thin sheet. For example, a conventional drill bores a clean hole in a one millimeter thick plate. You can not cut a resilient M6 threaded into this hole, as only a supporting thread would come about. By the bead, but is formed when flow drilling, wearing multiple threads and the thread is resilient.

The disadvantages include the high cost, high heat, and there are also special machines with high torque is required.

• Cutting tool