GB1226086A - - Google Patents

Abstract

1,226,086. Composite casting processes. SIEMENS A.G. 21 April, 1969 [20 April, 1968 (2)], No. 20331/69. Heading B3F. A stator core 1 (Fig. 5) has a grey cast iron housing cast upon it. The core 1 rests on a base 12 of a mould and is surrounded by a mechanically yieldable separating means 10. The mould also has side parts 13 secured together by wedged rings 15, 16 and a core 14 retained in position by a weight 17. The stator core is preheated to 300‹ to 900‹ C. before pouring the melt into the mould cavity 11. The separating means 10 ensures that molten metal does not contact the stator core. As the cast housing cools it contracts compressing the separating means and forms a firm bond with the stator core. The separating means can be a corrugated steel sheet 4 (see Fig. 2) or if the stator core is polygonal, a cylinder made from a steel sheet engaging the corners of the polygon but spaced from its edges (Figs. 3 and 4, not shown). A stator core jacket 19 (Fig. 6) may also form part of the separating means being held and spaced from the stator core by corrugated iron sheets 18. The sheets 18 may be replaced by fillets (not shown).