When there is not enough structural slope of the axle housing itself, enough draft angle of the axle housing should be given in the design of the axle housing or casting process to ensure the smooth mold lifting. It is usually formed by increasing the wall thickness of the axle housing, increasing or decreasing the wall thickness of the axle housing. The draft angle shall not exceed the wall thickness tolerance requirements of the axle housing.
According to the height of the stiffener of the axle housing is 18 mm, the draft angle of sand casting is required. Select a draft angle of 3 ° for the axle housing.
Through the analysis of the original design structure process of the axle housing, it is clear that the casting and analysis surface of the axle housing are horizontal, the pouring temperature is 1580 ℃, the dimensional tolerance of the axle housing is ct12, and the linear shrinkage of the axle housing is 2%. The inner cavity size of the core head is taken as follows: the length of the left core head is 50 mm, the length of the right core head is 50 mm, and the slope of the left and right core head is 3 degrees; the length of the upper core head is 50 mm in the vertical direction, and the length of the lower core head is 30 mm; the slope of the lower core head is 1 ° and the slope of the upper core head is 4 °.