PC2—5柴油机是法国热机协会设计的中速大马力柴油机。我厂一九八○年引进了该机球铁活塞进行试制。就该活塞结构(图1)、技术条件要求和材质QT60—2等而言,其铸造工艺性是十分恶劣和困难的。我厂经过多年试 PC2-5 diesel engine is the French heat engine designed medium-speed high-horsepower diesel engine. Our factory introduced the trial of the ductile iron piston in 1980. In terms of the piston structure (Figure 1), technical requirements and materials such as QT60-2, the casting processability is very poor and difficult. I plant after years of trial