| 摘要 |
The process serves for the preparation of tubular copper or copper alloy chills or ingot moulds for use in continuous steel casting system, including a first stage comprising the formation of an inclined shoulder on one end of a tubular blank having a rectilinear axis, by cold plastic deformation; a second stage comprising shaping the said blank in such a way as to impart to it a curved form; a third stage comprising subsequently introducing into the interior of the blank a mandrel having external shape and dimensions equal to those of the chill which it is desired to obtained; a fourth stage comprising passing the blank through a die of a drawplate having dimensions such as to deform the material of the blank to cause the internal surface of the blank to adhere strictly to the external surface of the mandrel; a fifth stage performed when the blank has traversed the die, comprising exerting a substantially axial force on the mandrel in the opposite direction from that exerted in the preceding stage, while one end of the blank is engaged on abutment sectors disposed beneath the die.
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