Development of a New Machining Tool for Bottom Forming in Deep Bore Holes

Deep hole drilling is a machining process for the production of cylindrical bore holes with a large length-to-diameter ratio. A special deep hole drilling process called chamber boring was developed for the production of contoured bore holes in axial direction [1]. For special applications not only the contouring in axial directions is required but also the contouring of the bore hole bottom. Therefore, a new chamber boring tooling system was developed in order to machine the bore hole wall as well as the bore hole bottom. Due to an exchangeable system of different tool sliders, even the surface finishing and treatment by roller burnishing becomes feasible. All processes, the STS (Single Tube System) deep hole drilling, the final machining and the roller burnishing can be executed on the same deep hole drilling machine with the same component set-up.