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我厂为外单位铸造了两个材质为HT25-47的大法兰,总重约3.6t。清砂后,发现在法兰表面上有五个缩孔(图1)。经与用户协商,
Outside the factory I cast two large flanges made of HT25-47, weighing a total of about 3.6t. After sanding, it was found that there were five shrink holes on the flange surface (Figure 1). After consultation with the user,