한국주조공학회

In this paper, the casting design of the integrated twin-scroll turbine housing with ex exhaust manifold using stainless steel is investigated. Due to the complexity in its geometry and the poor castability of stainless s steel, it is more crucial to set up the appropriate casting design to avoid casting defects. Gas porosity and shrinkage formation with the changes of gating systems (one- /two-side), riser conditions and pouring temperatures are examined via casting s simulation and virtual castings. Simulation results show that two-side gating system produced better quality casting than that of one-side gating system, minimizing the gas content of the castings and it is also verified by X side gating system, minimizing the gas content of the castings and it is also verified by X-ray analysis for the virtual castings. For the changes o of riser conditions and pouring temperatures in the two-side gating system, it is found that the change of the height of two risers p plays an important role in obtaining the best quality by reducing shrinkage defects.

Twin-scroll turbine housing, Stainless steel, Casting simulation, Gas porosity, Shrinkage, X-ray analysis, Riser, Pouring temperature