| 摘要 |
<p>1327282 Continuous casting ALCAN RESEARCH & DEVELOPMENT Ltd 27 July 1970 [8 Aug 1969] 36346/70 Heading B3F [Also in Divisions B1 C7 and F4] A flowing stream of molten metal, e.g. Al O<SP>r</SP> Al-base alloy, in a continuous casting process, is passed upwardly through a woven mesh filter, 17, Fig. 4, or 82, Fig. 7, maintained wholly submerged in the metal, to remove solid particles. The metal may be withdrawn from a holding furnace (12) by a siphon (14) with an outlet leg 15 having a heating jacket 23 and containing packing 24 over which argon is drawn by a suction pipe (27) at the top of the siphon to degas the metal. From the bottom of the leg 15, the metal passes to a chamber 29 on the rim 30 of which the filter 17, e.g. of several layers of woven glass fibre cloth, is held by a frame 18 (including a grid 38) and clamps 36. From the frame 18, the metal flows through a trough 19, with branches 19b, Fig. 6, leading to insulated reservoirs 46 each above a mould 11 with a starting platform 41. The filter layers may be spaced apart, with or without supporting grids; the layers may be discrete or woven together and mesh openings of 0À01-0À03 inch square may vary from layer to layer. A number of filters may be spaced along a flow path or a filter may be in series with a filter formed by a confined bed of refractory particles. In another embodiment, Fig. 9, the metal flows from either of two furnaces 62 through a trough 63 (without degassing) to a basin 64 from which it flows under a filter 82 beneath a grid 86 to rise through these into a frame 78. It then flows through a trough 91 to a tundish 93 with spouts 94 passing down into the metal in moulds.</p> |
