Section Bending with Kinematic Shaping
- Prof. Dr.-Ing. Dr.h.c. M. Geiger
- Prof. Dr.-Ing. M.Kleiner, Dortumnd
In the framework of this Dr.-Thesis a new section bending technique has been developed. For shaping the sections they are pressed into an elastic polyurethane pad by the vertical movement of a roller. The sections are bent flexibly through defined relative movements between the roller and the pad. This kinematic shaping makes the technology especially suited for the small to medium lot size production of bent sections with curvatures that vary along the length of the section. The basic research carried out within this thesis shows a strong relationship between the local curvature and the actual penetration depth, the section?s cross section shape and material properties, the actual section?s shape in the area with contact between section and pad, and the actual position on the pad. Only the knowledge about the real position of the strain free fibre in the section enables a good assignment of tool and section coordinates, which is necessary for bending operations with high accuracy. For the calculation of the required tool movements the finite element method as well as neural networks can be used alternatively. Both methods have been realized, implemented in the planning system and experimentally verified. Taking the production of a space frame made of bent extruded sections as an example it was demonstrated, how a new bending task can be successfully carried out in a short time period by using the new technique and the developed process planning system.