| 摘要 |
A screw is joined to the dummy bar used for starting the casting process. A metal plate is placed between the screw and the dummy bar and is provided with a joint which is previously stuck on the edge of the metal plate. The metal plate with the joint is then pressed onto the head of the dummy bar in such a way that when it is inserted into the mould the joint flattens itself against the inner walls of the mould. A support collar of appropriate length is fitted between the screw and the metal plate and the edge of the dummy bar may also be provided with a chamfered edge.
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