Development of an aluminum semi-solid extrusion process
AbstractSemi-solid extrusion process is a new forming process that is quite promising because the process requires lower forming pressure than conventional solid extrusion. In addition, semi-solid extrusion does not require large machines, which results in lower production costs. The aim of this article is to study the feasibility of an aluminum semi-solid extrusion process. The semi-solid technique selected for usage in this study was the Gas Induced Semi-Solid (GISS) process. The laboratory extrusion system was developed in this work. In the experiments, nitrogen gas was injected into aluminum melt for about 5 seconds. After that, the obtained semi-solid slurry was poured into the shot sleeve. The plunger then pushed the slurry through the extrusion die at different speeds of 2, 4, and 6 centimeters per second. In this study, the effect of holding time of the slurry in the shot sleeve was investigated. The results show that the plunger speed and holding time parameters affected the final extruded parts.
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