| 摘要 |
A riser sleeve with a breaker core comprises a sectionally V-shaped riser sleeve having a bottom opening and a breaker core having a central opening and attached to the bottom of the riser sleeve. The inner diameter D3 of the central opening of the neck-down core is substantially the same as the inner diameter D2 of the bottom opening of the riser sleeve, and the outer diameter D5 of breaker core is substantially the same as or larger than the outer diameter D4 of the bottom of the riser sleeve. The riser sleeve with breaker core greatly reduces the amount of finishing that the cast product requires after casting.
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