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
直接浇注和传统浇注工艺比较
通过对铝合金叶片直接浇注和传统浇注工艺的比较，研究表明：直接浇注不仅增 加了产出率，还优化了成本和砂型制造。
Franco chiesa, nicolas GiGuère 和 D. levasseur, 加拿大魁北克Trois-rivières市，魁北克金属研究中心 ；BernarD Duchesne，加拿大魁北克Trois-rivières市，Trois-rivières大学。
environmentally developed using conventional hydropower technologies (i.e., hydroelectric dams). Novel low power water turbines are sought to suit shallow, high flow rivers; they 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 Métallurgie du Québec, Trois-Rivières, Québec, Canada, was tasked with providing the technology to produce cast blades, meeting stringent conditions on as-cast surface finish (≤250 rms) and geometry (±2 mm [0.08 in.]) of the theoretical envelope (Fig. 1). Plus, 140MPa minimum yield strength and 2% elongation were required in the highest stressed parts of the blade. Aluminum alloy A356 (AlSi7Mg04) was selected for its availability and excellent castability. It also exhibits good corrosion resistance when immersed in fresh river water. As
D
L1 L2 L3 L4 L5 C1 C2 C3 C4 R1 R2 R3 E1
Table 1. Tensile Properties Inside the T6 Treated Blade 表1： T6测试中的叶片拉伸性能
Yield Strength (MPa) 屈服强度（MPA）
199 -
203 205 209 202 207 228 214 204 224 228 201
Ultimate Tensile Strength (MPa) 最终拉伸强度(MPa)
232 -
228 231 250 236 224 250 248 236 248 252 250
EIongation (%) 延伸率
2.3 -
2.2 3
3.1 2.3 2.1 2.1 3.3 2.4 2.1 2.2 2.9
Quality Index (MPa) 质量指数
285 -
279 303 323 289 272 299 325 291 295 303 319
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FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION December 2014
ue to its generous hydraulic basins, more than 90% of electricity in Quebec, Canada, is produced by water turbines. However, numer- ous sites cannot be economically, technically or
由
于丰富的水力资源，加拿大魁北克地区90％ 以上的电力来自水力发电。然而，很多使用 常规水电技术（即水电坝）的发电站不能产
生很好的经济效益，技术效益和环保效益。因此，研发 新型低功耗的水轮机来适应低水位、高流量的河流；这 样的水轮机尤其对偏远地区十分实用，可以替代燃料驱 动的发电机。
每台15 kW的水轮机螺旋桨由5个铸铝叶片固定在轮 轴上。加拿大魁北克Trois-Rivières市的魁北克金属研究 中心受委托提供叶片的铸造技术，需满足铸件表面光洁 度（≤250 rms）和外部几何尺寸（±2 mm [0.08 in.] ）的严格要求（图1）。同时，叶片承受最大压力的部 分需满足140MPa的最小屈服强度和2％的延伸率。 铝合金A356（AlSi7Mg04）以其可用性和优良的铸 造性能被选定为铸造材料。在清澈的河水中，它显示出
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