Casting Process Improvement of Spherical Bush Body to Overcome Defect of Gas and Shrinkage Porous
Aimend at the problem that water cooling channel sand core in heavy sectioned spherical bush was almost encircled by molten iron,resin sand with good collapsibility was used to facilitate the clean-up.The sufficient sized big riser was used for exhausting nitrogen gas at the spherical bush top and feeding.However,due to difficulty to determine the size of riser,particularly the size of riser neck,and control pouring temperature,the shrinkage porous often appeared at the root of riser on casting which leads to repair or casting scraped.Aimed at this problem some technical measures were taken such as changing the original bottom filling to ladder filling,and using the outer and inner profiled chill irons at the bottom of riser,and other process improvements.These defects were well resolved.