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牵引环是我厂主产品的重要铸钢件之一,它承受40吨左右的静牵引力,壁厚平均为50mm,要求比较严格,批量较大。1965年到1982年期间,该件因气孔及杆状断口(金相断口有明显发亮的氧化铝组织,焊接时易产生裂纹)缺陷,废品率高达21．3%,每年废品损失达4万元左右(按4000件计)。经采取措施后,自1983年以来,合格率已上升到96%左右。牵引环结构,参见图 1。材质为 32MuM。铸件毛重13．7kg,每箱2件,每箱钢水重58．38kg,工艺出品率47%,浇注温度1410~1440℃,浇注速度为5－7秒。造型用纸浆面砂加背砂,2#冒口芯采用中强
The traction ring is one of the important steel castings of the main products of our factory. It withstands about 40 tons of static traction and has an average wall thickness of 50mm. The requirements are relatively strict and the batches are larger. Between 1965 and 1982, due to stomatal and rod-shaped fractures (metallurgical fracture with obvious shiny aluminum structure, cracks easily when welded) defects, the rate of up to 21.3%, the annual loss of scrap up to 40,000 Yuan or so (by 4000 pieces). After taking measures, since 1983, the passing rate has risen to 96%. Traction ring structure, see Figure 1. Material is 32MuM. Casting gross 13.7kg, each box 2, each box of steel weighs 58.38kg, craft production rate of 47%, casting temperature 1410 ~ 1440 ℃, pouring speed of 5-7 seconds. Modeling pulp with sand and sand back, 2 # riser core using strong