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一、问题的提出大功率柴油机气缸头和排气集管铸件的水腔泥芯,结构复杂,细长单薄,壁厚小于10毫米。由于成型垫块形状复杂,不易制作,所以,一般生产中多使用垫砂。在冷硬树脂砂生产中,虽然脱模时泥芯已具备一定的强度,但由于这类泥芯悬空部分达90％以上,在重力作用下,将导致泥芯变形,甚至开裂,所以仍需采用垫砂。但冷硬树脂不能采用通常油砂制芯时所用的水基粘土砂作垫砂。这是因为水是冷硬树脂砂硬化过程中的生成物,水基垫砂中的
First, the problem raised High-power diesel engine cylinder head and exhaust manifold cast water chamber mud core, complex structure, slender and thin, wall thickness less than 10 mm. Because of the complex shape of the forming pad, not easy to make, therefore, the general production of sand mat. In the production of chilled resin sand, although the mud core already has a certain strength during demoulding, due to the suspended part of such mud core reaching more than 90%, under the action of gravity, the mud core will deform or even crack. Therefore, Pad sand. However, the cold and hard resin can not be used when the oil sand core made of sand-based water-based clay sand. This is because water is a product of the hardening process of chilled resin sand, which is found in water-based bedding sand