Numerical Simulation And Die Design For The Back Screw Semi-Solid Forming

The fish torpedo screw is an important part of fish torpedo drive system. Ithas a very complex shape. The mechanical performance and the shape precisionof the blades will affect the fish torpedo's performance directly. So it has a highrequest of the blades mechanical performance and geometry shape, it is hard tomanufacture. The traditional way to manufacture the screw blades is machiningthat has high material waste and low production efficiency. How to manufacturethe screw blades in a high efficiency and economical way is a matter to solveimperatively.An investigation of the screw blades forming process had been down in thisarticle. Investigated the shape parameters of the screw blades and established theequation of the circular cylindrical coordinates conversion. Base on the analysisof the initial data, use the Pro/E software established the geometry model of theback screw. The numerical simulation of the back screw forming process wasinvestigated, using the DEFORM-3D software, obtained the parameters that theworkpiece temperature, die temperature and die velocity effect on the parametersthat the distribution of the temperature, effective stress, effective strain, flowvelocity and forming load. Discovered the flow rule of the semi-solid material inthe back screw die, and applied the rule to guide the manufacture and the diedesign. In this article a die of the back screw has been designed dependent on theresult of the numerical simulation and the manufacture experiment of the forwardscrew.The screw forming process was investigated in this article that providedtheory basis and technics parameters for the manufacture, and provided aneffective way to manufacture the screw efficiently and economically. The way ofthe back screw die design will provide a reference to the same accessory.