| 摘要 |
A split die for the production of a rotor equipped with blades, which rotor has a bladed part with a central shaft and blades projecting radially from the latter and has a shaft or hub part not equipped with blades, is divided radially into a number of die segments which can be moved radially inwards to form a die cavity and radially outwards to open the die. Each die segment is divided in a plane perpendicular to the centre line of the die into a first part, shaped to correspond to the bladed part of the rotor, and a second part, shaped to correspond to the hub part of the rotor, these parts being held in sliding contact with one another. Immediately after the solidification of a metal melt in a region of the die cavity corresponding to the bladed part of the rotor, only the first part of each die segment is initially moved radially outwards, the purpose of this step being to reduce as far as possible the wear on this part, which is the most important part of the die, due to prolonged contact with the hot metal in the die cavity. The second part of each individual die segment is moved radially outwards only after the solidification of the metal melt in the remaining region of the die cavity corresponding to the hub part of the rotor.
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