Turbo-blowers inside the impeller and the blowers Shrouded Case paired parts of the system"s performance is one of the factors that determine parts. Shrouded Case for reducing thermal deformation of the optimal shape design and operating conditions, and a variety of blowers deflection Shape Analysis of Shrouded Case material was performed. Deflection reduction and optimal annealing conditions for improved workability and plastic strain and the A356, A390 aging time, the mechanical properties, formability evaluation found the optimal process conditions