Desarrollo tecnológico para la fundición en troquel de las aleaciones de alumino Astm 355 Y ASTM 40E.

Abstract

The present investigation concerns the technological development for the Die Casting in Aluminum Alloys ASTM 355 (Al-Si) and ASTM 40E (Al-Zn). In order to obtain data related to the influence of chemical composition on the mechanical properties in alloys above, standard tests were performed Spectrometry, Hardness, Impact, Stress and Metallographic (index grain size and porosity) in 10 specimens of each alloy type. For the tensil test specimens with the shape and dimensions under ASTM E 8, was designed and built a metal mold (made of cast iron) through the process of Numerical Control machining. The cast bars were subjected to Precipitation Heat Treatment. The mechanical and metallurgical testing showed that of both types of alloys, reached their maximum strength for a setting time of 3 minutes into the metal mold. Additionally, ASTM 40E aluminum alloy (Al-Zn) requires no heat treatment it reaches maximum strength in terms of die cat metal, significantly exceeding the mechanical properties of bars cast in sand. The results indicate that aluminum alloy ASTM 355 (Al-Si) find applications in the production of dies for plastic injection, body pump, piston compressors, while the ASTM 40E aluminum alloy (Al-Zn) could be used mainly as a surface coating for corrosion protection of steel to make molds for plastic injection.