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我厂生产的HL260—WJ—35型水轮机蜗壳是产品中的关键件,试制初期曾因裂纹而连续报废十三件。为此,成立了攻关小组,针对裂纹缺陷采取了相应的工艺措施,有效地消除了裂纹,从而保证了整机总装。一、铸件特点及裂纹产生部位 1、铸件结构及技术要求(见图一) 材质为HT20—40、铸件重750公斤、轮廓尺寸1500×1400毫米,平均壁厚为16毫米,较均匀。为了保证水轮机出水大小和减少水头损
The HL260-WJ-35 turbine spiral case produced by our factory is the key part in the product. During the trial production, 13 pieces were continuously scrapped due to cracks. To this end, the establishment of the research team to crack defects for the corresponding measures taken to effectively eliminate the cracks, thus ensuring the assembly of the machine. First, the characteristics of castings and cracks in parts 1, casting structure and technical requirements (see Figure I) made of HT20-40, castings weight 750 kg, outline size 1500 × 1400 mm, the average wall thickness of 16 mm, more uniform. In order to ensure the size of the water turbine and reduce head loss