| 摘要 |
1,126,133. Ingot moulds ; casting processes. R. E. DALEY. 10 March, 1967 [12 Sept., 1966], No. 11390/67. Heading B3F. To counteract piping when casting an ingot. in a mould having a cavity with an upwardly tapered portion 18 or 44, solidification of metal at the bottom of the portion is delayed by a band 21 or 43 of refractory insulation, of exothermic material or of both. Cooling of the top of the metal is encouraged by thickening of two opposed side walls of the mould at the top of the cavity as indicated in the figures. As shown in Fig. 7, a big-end-down mould is located by lugs 20 on a stool 19 to retain the band 21 in a bottom portion of the mould cavity, formed in the stool over a pad 22 of steel, paper pulp, wood or refractory protecting a replaceable refractory insert in the stool. A simple stool with replaceable insert (8) may be used, Figs. 1-5 (not shown), the band resting on the stool and lining the bottom portion of the mould cavity side wall, possibly in a recess therein. The separate bottom part of the mould may be a of section 41, Fig. 11, comprising a large portion 45 of the mould cavity, the band 43 lining a mould section 42 between the upper and lower sections 40, 41. The middle section may be omitted, the band lining a recess in the upper or bottom section, Figs. 9, 10 (not shown), and the upper section may be borne on blocks 49, Fig. 12 (not shown), on the lower section, the blocks being burned or knocked away, after pouring, to add the weight of the upper section to the pressure on the later-solidifying molten metal towards the bottom. |
