【摘要】 耐高压的液压件采用球墨铸铁(简称“球铁”)材质是一项先进技术。但是球铁的补缩困难,特别是对薄壁、复杂的液压件,热节处易产生缩松而导致铸件的渗漏,这是采用球铁生产液压件的关键问题。我们采用发热冒口解决球铁液压件的补缩问题。研究结果表明:发热冒口套热损失率比普通砂型冒口降低53％,等效模数约为几何模数(砂型冒口的模数)的两倍。节约冒口金属的50～80％,解决了普通砂型冒口解决不了的球铁液压件的补缩问题。更多还原

【Abstract】 Using spheroidal graphite cast iron to produce the. casting which resistance to high-presure is an advanced technique. It is a key Problem of producing spheroidal graphite that feeding is difficult, especially Producing thin and complicated presufe-resisting casting causing sisPer-sed shrinkage at hot sPot,which result in the leakage of fluid infiltrates. To solve the problem , the exothermic riser for compensating volume contraction of spheroidal graphite cast iron can be used.The results show that the rate of heat dissipation through the exothermic riser decreases by about 53% as compared with sand head, the modulus of exthermic riser is twice as much as the geometric modulus, 50-80% of riser metal can be saved. The exthermic riser can solve the feeding problem above mentioned but the sand riser can’t do so.更多还原