Overall dimension of Puma main cover 182mm × 130mm × It is 63.5mm, 5.4kg, QT500-7, hb170-241. Dimensions of v348 differential case φ 200mm × 115mm, mass 5.3kg, material grade qt550-6, body hardness hb197-255, casting shape and testing parts are shown in Fig. 1 and Fig. 2.
The process capability CPK of Puma main cover and v348 differential case are 0.51 and 0.74 respectively. The hardness distribution is shown in Fig. 3 and Fig. 4.