Hifeen for manufacturing various host plant facilities have begun to use aviation technology and requirements. Through the strict requirements of raw materials to machining and heat treatment, the semi axle is selected from high quality alloy steel, which not only meets the requirements of GB/T3077-1999, but also is more stringent for some elements in order to meet the manufacturing process requirements. The EF+LF+VD process uses advanced steelmaking raw materials, the harmful gas of steel control in N+H+O = 50ppm, H = 2PPM. Half shaft after forging, the grain size by GB/T6394-2002 detection, the average grain size of more than 6 level requirements. The macrostructure of forging press GB/T 1979-2001 testing requirements of ingot and center segregation is less than 2, generally less than or equal to 2 of any loose, general spot segregation and general edge segregation is not allowed. In the process, both ends of the spline are all up to 6 grade accuracy, and ultrasonic inspection is carried out several times. According to the GB/T6402-1991 standard, the quality requirement is not allowed to appear any defects.
