六、圆环类铸件的浇注系统圆环类铸件一般指的是高度小于直径的短筒或截面壁厚大于高度的扁环。这类铸件的技术条件要求不一,有的全部表面加工,有的部分表面加工,有的不允许有任何缺陷,有的次要表面许可有轻微缺陷。因此,选用浇注系统应以此为前提来考虑。 Sixth, the ring castings casting system Ring castings generally refers to the height of less than the diameter of the short tube or section wall thickness greater than the height of the flat ring. Such castings require different technical conditions, and some all the surface processing, and some part of the surface processing, and some do not allow any defects, and some secondary surface permits slight defects. Therefore, the choice of casting system should be based on this premise to consider.