|
With the development of modern industry , and toughening lightweight parts manufacturing has increasingly become an urgent requirement and development direction . The high - strength aluminum alloy has a low density , high strength, thermal processing performance , can effectively meet this requirement . Squeeze casting is a forming adapt to a wide range of quality , high production efficiency of new forming process . High Strength aluminum alloy squeeze casting process organic combination of great importance for both academia and industry . The research , design a carrying hook parts to direct red head squeeze casting mold . Its exact size , reasonable structure , running smoothly and efficiently , and to complete the squeeze casting process for different materials under different process conditions to obtain a high quality carrying hook parts . This paper studies the ZAlCu5Mn material formability direct punch squeeze casting process conditions . Metallographic analysis of the microstructure and mechanical properties of test castings obtained by repeatedly pouring test optimized squeeze casting process parameters : extrusion pressure 60MPa, mold temperature of 250 to 300 ° C , the liquid alloy pouring temperature of 710 ~ 720 ℃, to punch Paul pressure time 15 to 20S . In this condition , able to obtain a smooth surface, and outline the exact size , internal organization of dense , fine grain size , the No Shrinkage organizations such defects castings . Tensile strength reached 293.75MPa by T4 heat treatment after casting , and elongation of 8.25% . Compared to gravity metal conditions , 45.2% and 6.96 times respectively . And superior to the resin sand and wet sand conditions the performance of the casting ( T4 under the conditions of tensile strength and elongation were 276.69MPa, 4.69% and 281.94,6.68 %) . The subject also direct extrusion of deformed aluminum alloy casting technology exploration and research . Their mechanical properties and microstructure analysis found that the presence of oxide inclusions seriously affect the forming quality is the most important factor . Finally, for each of the six experiment squeeze casting defects include Shrinkage cracks, blisters, slag , cold traps , sticky mold strain , analyze their characteristics , formation mechanism , influencing factors , and preventive measures and solutions .
|