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US09446445B2 Method for manufacturing hollow shafts 有权
空心轴制造方法

Method for manufacturing hollow shafts
Abstract:
The present invention describes a method of manufacturing a near-net shaped hollow shaft useful for high power applications such as gearboxes for wind energy industry. The method involves providing a concast bloom (of a round or rectangular or of any polygonal cross section) or an as-cast round ingot from which a hollow perform is prepared using hollow die punching, followed by process of heat treatment, proof-machining and stress relieving.
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