Papers by Keyword: Low Rigidity Parts

Abstract: The present work aims to optimize the processing parameters to minimize the geometric deviations of thin-walled parts machined from 6061-T651 aluminum alloy by high-speed milling (HSM). The experimental tests were carried based on a factorial design of experiments, which included as input factors axial cutting depth, cutting speed, and feed per tooth, resulting in shape deviations but also roughness and hardness of machined surfaces. After machining, the residual stresses were determined to establish, if possible, a cause-effect relationship between parts deviations and the magnitude of stresses involved. The experimental tests allowed us to obtain the optimum machining parameters under maximum productivity conditions that ensure the required geometric precision of parts.

Abstract: In this paper, a 3D dynamic model for the prediction of the stability lobes of high speed milling is presented, considering the combined flexibility of both tool and workpiece. The main aim is to avoid chatter vibrations on the finish milling of aeronautical parts, which include thin walls and thin floors. In this way the use of complex fixtures is eliminated. Hence, an accurate selection of both axial depth of cut and spindle speed can be accomplished. The model has been validated by means of a test device that simulates the behaviour of a thin floor.