On the Manufacturing of a Gas Turbine Engine Part through Metal Spinning Process

EasyChair Preprint no. 14

Abstract

Metal spinning is one of the oldest sheet metal forming processes, which involves a simple tooling and a spinning lathe, whatever manual or computer numerical controlled. However, for its high flexibility and the possibility to produce thin wall sectioned near net shape parts in a very cheap way, sometimes with high complexity geometries, could be revived as an interesting alternative in many applications fields such as automotive and aerospace, whereas other sheet forming processes like deep drawing does not match costs requirements for little dimension production batches. In this work, the production of a flame tube head sector prototype using an AISI 304L stainless steel is proposed, in order to evaluate the process feasibility for the required part geometry. The prototype production was carried out using a two-stage semiautomatic spinning process, starting from a 1mm thick sheet. No preheating of the sheet was adopted to enhance its ductility. The process effects in terms of wall thickness reduction, and hence in cold working, were investigated. Using optical microscopy and Scanning Electron Microscopy (SEM) techniques, the microstructural behavior of the metal subjected to the forming process was investigated, while for an evaluation of the hardness variation Vickers micro-indentation tests were performed. The main result of the process, as observed from all the investigation techniques adopted, is the formation of strain induced martensite, due to the severe plastic deformation and cold reduction of the material, ranging in this case from 30% to 50%. In some areas of the part section, some rips indicating an excessive tensile stress were also detected.

Keyphrases: Metal Spinning, Sheet forming, Stainless steels, strain induced martensite

@Booklet{EasyChair:14,
  author = {Andrea El Hassanin and Antonello Astarita and Fabio Scherillo and Antonino Squillace and Carla Velotti and Aurelio Liguori},
  title = {On the Manufacturing of a Gas Turbine Engine Part through Metal Spinning Process},
  howpublished = {EasyChair Preprint no. 14},
  doi = {10.29007/sbcv},
  year = {EasyChair, 2018}}