By Robert Wilson
Contiuous casting of non-ferrous metals has been practiced for good over a hundred years. the method has many merits over static ingot and e-book mildew casting, an important being superior yield, decreased power intake and aid in manpower, with a consequent relief in expense. This e-book presents an account of the way non-stop casting has built and the way the method can be utilized inside an engineering atmosphere for casting quite a lot of copper-based alloys and valuable metals, together with gold and silver, and chosen nickel alloys.
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Additional info for A practical approach to continuous casting of copper-based alloys and precious metals
The die insert is fitted with the appropriate 'fiberfax' (alumina silicate) insulation washers on the shoulder to reduce the heat flow between graphite die head and copper cooler face. 9 SAFETY FROM LIQUID METAL RUNOUT In continuous casting in either horizontal or vertical mode there is always the danger of molten metal runout from the die exit face. 28 Continuous Casting With good engineering practice in equipment design and meticulous attention to operating procedure this should never occur; however, malfunction cannot be ruled out - therefore consideration of possible causes should be examined.
21 is machined and broached on the ID to give a 'mirror finish'. The OD die shank is machined slightly oversize to the cooler bore to allow final emery lap finish to size. The packers which make up the secondary cooler section are machined to give a tight fit with bore size matching the die insert. The cooler is heated with hot water prior to packer and die insert fitting to allow expansion and ease of fit. The packing spacers are fitted and positioned to the correct datum line, followed by the die, which should be a tight fit into hot copper cooler; this ensures an intimate graphite-copper contact.
The interfacial contact is good in this area. Another advantage is that the temperature difference is high between the two media and so the heat transfer rate is fairly high. Lower down the mould, at point B, as the temperature falls below the liquidus, solidification begins at the mould surface. ; particularly where the shell is thin and breaks every cycle. Due to the cyclic withdrawal the solidification front oscillates around a mean position moving up and down the hs interface. As the thin solidified skin breaks, and the gap is filled with liquid metal, this introduces a very high temperature gradient.