| 摘要 |
The method for manufacturing needle case by vertical centrifugal casting, puts a ring (5') on the floor of a mold (1), fixes the ring (5') with a circular plate (7), a bolt (8) and a nut (9), inserts a plastic packing (10) between the ring (5') and the circular plate (7), pours melting metal, rotates the mold (1) by a motor (2) and forms the needle case (14) with a projecting ring (5).
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