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本文介绍了50万瓩大型法兰西斯式水轮机铸—焊转轮的制造过程和施工简图。转轮的最大外径约6300毫米,加工后净重约100吨,用13Cr5Ni不锈钢制造,此钢除了有优良的机械性能、韧性和抗气蚀能力外,其焊接性能也是很优异的。由于整体熔炼和铸造的能力不足,因此,转轮是分若干部份铸造的。砂型用干模砂和发热自硬砂制成,砂芯用自硬法制成。开始制造前,分析了影响焊接变形的因素,通过拘束载荷和拘束强度的计算,确定了拉筋的尺寸,数量和位置。
This article describes the 500,000 瓩 large Francis turbine casting - welding wheel manufacturing process and construction drawings. The maximum diameter of the runner is about 6,300 mm and the net weight after processing is about 100 tons. Made of 13Cr5Ni stainless steel, this steel has excellent welding performance besides excellent mechanical properties, toughness and cavitation resistance. Due to the lack of capacity for overall smelting and casting, the runner is cast in sections. The sand mold is made of dry mold sand and heat self-hardening sand, and the sand core is made by self-hardening method. Before starting manufacture, the factors affecting the welding deformation were analyzed. The size, number and position of the brace were determined by calculating the restraining load and restraining strength.