Research On Liquid Forging Technology Of Al Alloys End Cover Of Special Vehicle

In this paper, an end cover of special vehicle with material2024aluminumalloy was studied. The influence of pouring temperature and mold temperature ontemperature field was found by simulating, and the location of shrinkage,shrinkagecavity were predicted. To get the best microstructure and mechanical properties,different process parameters were changed during the experiment.ProCAST software was used to simulate the solidify process on temperaturefield. The variation of the solidify process on temperature field was as follows: thedistribution of temperature is inhomogeneous in the workpiece. The whole processshowed that the liquid metal solidify into inside layer by layer. Temperature of theflange fell the fastest,and the bottom of the workpiece was the slowest. Whenpouring temperature was720℃~730℃, the probability of shrinkages weredecreased. When pouring temperature is730℃, hardly any shrinkages appeared inthe workpiece. the corner of the workpiece is likely to appear shrinkage and thermalcracking and other defects.Through analysis of the experiment, we can know that, when pouringtemperature is720℃~730℃and mold temperature is200℃~300℃,or pressure islager than56MPa, hardly any shrinkages appeared in the workpiece.This experiment results indicate that when pouring temperature is730℃, moldtemperature is200℃,and pressure is64MPa, the grain size of the workpiece wasvery thin, the grain shape and distribution were well-proportioned. The mechanicalproperties reached the peak value. In this condition, the distribution and the size ofthe metallographic structure of grain got well-proportioned as the increase of feedshrinkage. When feed shrinkage is4mm, the tensile strength of flange was394.3MPa,while the bottom408.4. The metallographic structure and mechanicalproperties of flange and bottom got homogeneity by complex loading.