Concern for reliability prompted the manufacturer of a reversible fan used on engines for off-highway equipment to convert to a forged fan hub.The previous hub (not a forging) performed according to design specifications,but part discontinuities or undetected internal flows could have caused it to shatter were it struck by a foreign object during its 180 rpm rotation.At no increase in overall cost, the forged fan hub provides an extraor dinary degree of safety due to its structural integrity.

非公路设备回转的风扇的制造厂家改用了锻造毂。非锻造毂虽然按照设计要求生产，但是零件的内部组织的不连续性或未知的内部流线，在180rpm的转速下，会被外来物体撞击而裂碎。在不增加总体成本的情况下，锻造毂由于它内部组织结构完整致密，使其具备了超好的安全性。