# Impeller investment casting – sand casting to determine the shape, size and number of risers on the rim

(1) Impeller investment casting – Determination of specific shape and size of riser of wheel flange in sand casting

According to the specific shape of impeller investment casting sand casting rim, the standard waist round open riser is also selected.

M flange = 2.27 according to the data:

A = 110mm, B = 165mm, H = 138mm (150mm is the same as the height of hub riser of impeller investment casting sand casting).

Considering the width of the impeller investment casting sand casting rim, the height of the flange diameter is set to be 10mm, and the width of the contact with the impeller investment casting sand casting hub is the same as that of the hub, which is 40mm. The riser weight is 21kg when ε＝ At 6%, the maximum volume of castings that can be fed is VC = 3.0 × 103cm3。

(2) Calculation of feeding capacity of riser of impeller flange in investment casting sand casting

Half of the width of impeller investment casting sand casting rim and spoke (the outer part with a radius of 14.65cm) is fed by a riser set on the impeller investment casting sand casting rim. Impeller investment casting – sand casting rim part required feeding casting volume = (24.32-20.82) × three point one four × 13.8+(20.82-14.652) × three point one four × 3 =8.89 × 103cm3

Because 8.89 × 103cm3÷3.0 × 103cm3=2.96≈3

Therefore, three risers need to be set on the rim of impeller investment casting sand casting.

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