Etude de l'influence du mode de lubrification sur les performances d'usinage du composite a matrices d'aluminium.

摘要

The composite of aluminum alloys have exceptional properties which provide for them a wide industrial application. The GrA-Ni 10S.4GRTM is an aluminum matrix composite which contains two particles, SiC and graphite coated with a layer of nickel. Its production in particularly by machining is still problematic. The particles can raise problems of abrasive wear on the cutting tool, surface roughness, high cutting force, and subsurface damage. This research is concerned to elucidate the performance of machining of GrA-Ni 10S.4GRTM in different environments. We have planned a series of tests by a statistical method based on a descriptive approach. The milling performance of a piece of GrA-Ni 10S.4GRTM was evaluated by determining the influence of different type of lubrication on performance criteria: tool life, cutting force and surface roughness. Our results for the milling of a piece of GrA-Ni 10S.4GRTM have been confirmed: (1) The Wet and MQL machining compare to the dry machining increases the tool life and improves the surface roughness. In most cases, the MQL during machining can improve tool life and surface roughness more than the wet machining. (2) Improving the surface roughness under MQL is enough significant to be chosen in the cases where surface roughness has an important role. (3) Wet and MQL machining compare to the dry machining greatly increases the cutting force. (4) Optimizing the performance of the machining process is achieved by considering only two criteria: tool life and cutting force. (5) The most important criterion in the sense of reduced time and the cost of production during machining is tool life. (6) Performance of machining in sense of time and cost of production is dependent on the lubrication mode and will be increased significantly with the MQL machining.