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Applied Science in the Casting of Metals by K. Strauss

By K. Strauss

Utilized technological know-how within the Casting of Metals makes a speciality of metallurgical operations.
The e-book first discusses the manufacture of iron and metal. issues comprise remedy of liquid iron and metal; therapy of molten iron among blast furnace and steelworks; and remedy of liquid metal. The textual content takes a glance at casting pit perform, together with ingot feeding, scorching topping of alloy steels, equipment of utilizing hot-tops, and hot-topping tools.
The choice specializes in spray metal making and non-stop casting of metal. the method occupied with spray metal making; the elemental ideas of casting of metal; and metallurgical features are mentioned. The textual content describes the therapy of forged iron; therapy of non-ferrous heavy metals; remedy of aluminum and magnesium alloys; and remedy of molding sand from molds and cores.
The ebook explains the feeding of metal castings. issues comprise improvement of exothermic feeding; mechanisms of alumino-thermic reactions; functions of exothermics to metal castings; and floor additions.
The textual content is a necessary resource of knowledge for readers attracted to metallurgical operations.

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Superimposed exothermic head. FIG. 24. The wedging action of corner pieces. H O T - T O P P I N G METHODS AND THEIR D E V E L O P M E N T 51 3. Super-insulating Hot-tops, Multiple-piece Such assemblies comprise relatively thin tiles made with the correct curvature of the back faces to fit the camber of the mould or retaining head box. These are held in position by either wedging action, or nailing, or clipping to the supporting metal. Wedging is best done by making an eight-piece assembly where correctly curved tiles are located centrally on the mould faces and shaped corner pieces are driven in to lock the whole head into a secure unit.

When the insulator's temperature has been raised to that of the adjacent plate highly insulating properties ensure that further heat loss is very slow. 3. The exothermic face of the sand-backed duplex assembly burns on contact with the hot plate and quickly reaches a higher temperature than the plate. For a short period of time after application, the lining contributes heat to the plate, raising its temperature. After approximately 7 minutes the lining and plate are at the same temperature and, from this time, heat flows from the plate by conduction through the relatively poor insulating layers of sand and burnt exothermic residues.

Godbehere (5) in his study of typical product usage in the United Kingdom. His table, repro­ duced in Fig. 34, is based on the following assumptions. e. e. increase in cost due to insulator head per ingot ton £0-25, or per 10,000 ingot tons £0-40 (f) Cost of scrap needed to replace extra yield per ton £15 £4,500 £2,500 (g) "Break-even" refers to the point at which the extra cost entailed in replacing an existing heading method by either exothermic or insulator equals the value of the increased yield at the shear.

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