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 publication mildew casting, an important being more suitable yield, lowered power intake and relief in manpower, with a consequent aid in expense. This ebook presents an account of ways non-stop casting has constructed and the way the method can be utilized inside of an engineering atmosphere for casting quite a lot of copper-based alloys and necessary metals, together with gold and silver, and chosen nickel alloys.
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Extra resources for A practical approach to continuous casting of copper-based alloys and precious metals
The graphite die can be either single channel with top plate cover or twin channel. The twin channel is generally used for heavy section as the design gives more rigidity. It is recommended that high-quality graphite with maximum thermal conductivity is used in the fabrication of these dies. Precise machining and polishing of the casting die surfaces are essential and intimate contact between graphite and plate cooler is necessary to maximise heat transfer. 35-mm-thick 'grafoil' is interleaved between the copper cooler surface and the graphite die.
The top section (A-B), with the heat transfer coefficient between the liquid metal and the graphite mould, is denoted by hI. 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.
2 CAST SURFACE FINISH - DETERIORATION WITH TIME Surface finish on rod, strip or tube will deteriorate with time. On starting a casting run, once the correct conditions of pulse length and casting speed have stabilised, an optimum surface finish will be achieved and should be maintained over a prolonged casting period. 23 depicting conditions within the ~ T STEADY STATE CONDITIONS UNINTERUPTED CASTING PERIODIC Fig. 23 Conditions within solidification zone of die. 31 INTERUPTED CASTING Continuous casting of Copper-Based Alloys and Precious Metals solidification zone of the die, certain criteria have to be met to give a satisfactory product.
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