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Direct Pour Vs. Traditional Gating


A study comparing direct pouring and traditional gating for an aluminum blade showed direct pouring increases yield and improves costs and mold making. FRANCO CHIESA, NICOLAS GIGUÈRE AND D. LEVASSEUR, CENTRE DE MÉTALLURGIE DU QUÉBEC, TROIS-RIVIÈRES, QUÉBEC, CANADA, AND BERNARD DUCHESNE, COLLÈGE DE TROIS-RIVIÈRES, TROIS-RIVIÈRES, QUÉBEC, CANADA


bec, Canada, is produced by water turbines. However, numerous sites


D


L1 L2 L3 L4 L5 C1 C2 C3 C4 R1 R2 R3 E1


199 -


203 205 209 202 207 228 214 204 224 228 201


UTS (MPa) 232 -


228 231 250 236 224 250 248 236 248 252 250


40 | MODERN CASTING August 2014


ue to its generous hydraulic basins, more than 90% of electricity in Que-


cannot be economically, technically or environmentally developed using conventional hydropower technolo- gies (i.e., hydroelectric dams). Novel low power water turbines are sought to suit shallow, high flow rivers; they


Table 1. Tensile Properties inside the T6 Treated Blade YS (MPa)


EI (%) 2.3 -


2.2 3


3.1 2.3 2.1 2.1 3.3 2.4 2.1 2.2 2.9


Q (MPa) 285 -


279 303 323 289 272 299 325 291 295 303 319


would be particularly effective in remote areas where they could replace fuel powered generators. Each propeller for a 15kW water


turbine uses five cast aluminum blades fixed to its axle. Te Centre de Métal-


Fig. 1. The 20.2-lb. (9.1 kg) aluminum A356 water turbine blade is 36.6 in. (930 mm) long, with thickness ranging from 1.7 in. (44 mm) to 0.5 in. (13 mm).


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