Research On ZL104 Organization And Performance Of Full Mold Casting

As a new casting technology,the full mold casting technology was invented in the United States in 1956.In the beginning,the full mold casting technology was used for the production of works of art.But now,it has been used widely for the production of aluminum alloy and cast iron castings.At present,the resin sand full mold casting is one of the main production methods used for aluminum alloy castings.Aluminum alloy castings by any full mold casting are easy to have foundry defects,which are mainly attributed to higher pouring temperature than one for traditional casting method,and to the trapped-gas and the oxidation of aluminum alloy molten metal.At the same time,the defects such as coarse grains,shrinkage cavity and shrinkage porosity et al.often occur in the castings because the heat coefficient of the resin sand is lower and the mold cooling speed is slower.Therefore,the mechanical properties of castings reduce rapidly.Furthermore the development of aluminum alloy by full mold casting production is restricted for the above reasons.In this paper,taking the ZL104 alloy as a research object,the mold filling capacity of molten aluminum alloy and properties of casting under the different process conditions of full mold casting were researched.Also,the influences of the pouring temperature,mechanical vibration,the negative pressure on the microstructure and mechanical properties of ZL104 alloy have been investigated.Based on the above studies,a feasible technological solution which can reduce casting defects and improve the performance of aluminum alloy castings was tried to be found.Through the compound experimental researches by single factor and multi-factor,the variation of the mold-filling capacity of molten the ZL104 aluminum alloy,the mechanical properties and the casting microstructure along with the pouring temperature,mechanical vibration,the negative pressure were given.The results of the study shows that the main factors influenced the mold filling capacity,mechanical properties and microstructure of the ZL104 castings are successively the mechanical vibration,the pouring temperature,and the degree of negative pressure.The results show that when the mechanical vibration frequency is 40Hz-50 Hz,not only the mold filling capacity and the properties of aluminum alloy casting can be improved significantly,but also the pouring temperature can be reduced thereby some of the casting defects can be avoided as higher pouring temperature.And when the degree of negative pressure is in the 0.03MPa-0.04 MPa,the mold filling capacity of molten aluminum alloy and properties of the casting may be improved to a certain degree.