Abstract

Electrical discharge machines (EDM) have conventionally been used for cutting the nozzle blade holes in steam turbine diaphragm spacer rings due to high precision requirements. Problems associated with this method are slow cutting speed and a potential for fire resulting from the usage of oil. The abrasive water jet machine (AWJ) avoids these problems and makes it possible to cut three-dimensional curved work pieces in the horizontal position. This is performed by utilizing two heads with each head featuring simultaneous control in five axes. AWJ technology makes relatively high speed cutting possible while maintaining high precision requirements.

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