我厂采用呋喃Ⅰ型树脂泥芯卷生产4115柴油机缸体,一度铸件针孔废品严重。针孔多发生在由芯子成型的主油道、轴瓦螺孔脐子和缸口等肉厚部位的表面上,针孔直径约1～3毫米,深2～4毫米。先后两个月针孔废品占整个铸件废品的41.6％和74.6％,损失达3万余元。 I plant furan type Ⅰ resin mud core roll production of 4115 diesel engine cylinder, once the casting pinhole serious waste. Pinhole occurs in the main oil core formed by the core, bushings, umbilical childbirth and cylinder fleshy parts of the surface, the pinhole diameter of about 1 to 3 mm, 2 to 4 mm deep. For the first two months, the waste of pinholes accounted for 41.6% and 74.6% of the total castings respectively, with a loss of more than 30,000 yuan.