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第二汽车制造厂铸造一厂,自1983年以来,使用F03低氮铸造树脂砂后,使气缸体的渗漏率下降到4％。第二汽车制造厂在铸造生产中,热芯盒芯子约占80％。以往,热芯盒全部采用高氮低糠醇、高粘度的呋喃Ⅰ型树脂,配制的芯砂流动性差,吸潮性强,芯废率高。由于树脂含氮量高,浇铸时氮被分解出来,使铸件形成气孔等缺陷。为了降低废品率,1982年,第二汽车制造厂技术中心、铸造一厂和郧县油漆厂,在分析国内外铸造树脂生产及应用状况的基础上,根据铸件的工艺要求,共同研制了低氮
The second automobile factory cast a plant, since 1983, the use of F03 low nitrogen casting resin sand, so that the leakage rate of the cylinder block down to 4%. The second car factory in the casting production, hot box core accounts for about 80%. In the past, all the hot-box used high-nitrogen furfuryl alcohol, high viscosity furan type I resin, prepared sand core fluidity is poor, strong moisture absorption, high core waste rate. Due to the high nitrogen content of the resin, the nitrogen is decomposed during casting, causing defects such as porosity in the casting. In order to reduce the rejection rate, in 1982, No.2 Automobile Manufactory Technology Center, Foundry Factory and Yunxian Paint Factory analyzed the production and application of domestic and foreign foundry resins and jointly developed low-nitrogen