รายละเอียดเอกสาร

This specification deals with the acceptance specifications for the ultrasonic examination of forged steel crankshafts. This practice is applicable to both solid (slab) forged and continuous grain flow crankshafts. Specimens shall be divided into three volumetric zones, namely: the major critical sections (Zone 1), which includes the heavily loaded areas of the crankpins, webs, and main bearings; the minor critical sections (Zone 2), which includes the balance of the surface areas of the main bearing and crankpin journals and adjacent fillets, flanges, and gear fit areas; and Zone 3, which includes the balance of the crankshaft, and the remaining sections of the webs. The crankshafts shall be examined after heat treatment, but before machining geometric features such as chamfers and oil holes. Acceptance zones and criteria for both types of crankshafts are discussed briefly.