Intelligent Control Of Casting Solidification Process Based On Temperature Control Technology

ZL205A alloy is a self-developed high strength casting alloy in China.It is a typical Al-Cu alloy with high strength,good toughness,good processing performance and excellent corrosion resistance.At present,ZL205 A is widely used in aerospace field.Taking ZL205 A alloy sand mold as the research material,gravity casting as the casting method,by adopting the combination of experiment and numerical modeling method,studied the casting solidification process and the subsequent cooling process temperature control on the rule of casting shrinkage and deformation.Based on temperature control technology,the basic idea of synergistic control of shrinkage and deformation of castings is established and the corresponding control technology is developed.As for castings,carried on the research of temperature control to shrinkage and deformation control,the research shows that: under the condition of sand mold casting,the mould is preheated by heating rod,when heating bar is 350 degrees heating 25 min,casting surface in 700 degrees of pouring is in good condition,which show that in sand mold casting using heating rod heating mold temperature gradient is feasible.Adopt the method of temperature control intervention in advance,by controlling casting temperature gradient is studied to control the shrinkage of casting,studies have shown that under the condition of this research,control of mould temperature gradient,the greater the casting shrinkage tendency is smaller,when mould temperature gradient control under 5.85 ℃ / cm,no shrinkage defects of castings can be obtained.Research suggests that the control of mold temperature can effectively control the deformation of the casting under the condition of this experiment,the temperature control adopts the one side heating control,one side cooling control and compound control,the results showed that the test piece generate tilt to heating cooling side,according to the axis of the test piece as a benchmark,oblique Angle is 1.483 ° and 1.511 ° and 1.725 ° respectively,under compound control,the tilt increased.On this basis,we carry out the comprehensive control technology based on the temperature shrinkage and deformation research,namely above the solidustemperature carry on the preheating temperature gradient control in order to eliminate shrinkage defects of castings,under the solidus temperature the casting temperature is controlled so that the casting temperature is even and the deformation caused by temperature difference is eliminated to the maximum extent,at the same time,the use of mould temperature control to achieve low temperature annealing of castings,further to eliminate the residual stress of castings.Under the conditions of this experiment,the temperature control technology for the comprehensive control of casting was obtained through the optimization of numerical simulation.,namely initial temperature gradient is 5.33 ℃ / cm,after solidification,casting temperature control at 300 ℃ respectively holding 600 s,and200℃ holding 600 s,The experimental results show that there is no shrinkage in casting and casting angle reduce to 0.6 °.Using the temperature control technology of research and development,on the ring castings application verification,based on the numerical simulation technology,The results show that the shrinkage of casting smaller than traditional control technology,and the deformation of castings reduce 5.557 mm.