江西柴油机厂铸造工人在毛主席的光辉哲学思想指引下,大胆实验,在坭芯表面加面砂,革了习惯上在坭芯表面刷涂料这个老工艺的“命”.用加面砂的坭芯浇出的铸件内腔光洁,砂子轻轻一敲就下来了.该厂采用的芯砂配方如下表: Under the guidance of Chairman Mao’s glorious philosophical philosophy, the foundry workers of Jiangxi Diesel Engine Factory boldly experimented with adding sand to the surface of the core and changed the habit of painting the paint on the surface of the core with the old technique. The inner cavity of the casting core is smooth and smooth, and the sand is knocked down gently. The formula of the core sand used in the factory is as follows: