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前言目前,对船用的和固定式的烧重油的四冲程柴油机中一般使用的整体活塞来说,轻合金活塞材料的使用极限比二十年前更加突出了。特别是承受高压、热负荷较大的情况下,这些材料的限制尤为明显。况且,不可能避免由固体燃烧残渣造成的在端环槽背的机械磨损。为了克服上述制约,人们研制了组合活塞.不同材料有利的性能与最适合临界负荷区域使用的材料相结合。对用于烧重油发动机中的活塞来说,由一个锻造的钢顶部和一个锻造的轻合金裙部所组成的组合活塞设计已成为世界范围的主导设计。 然而,为了在将来能成功地应用,组合活塞设计仍需改进以满足烧重油的柴油机对它
Foreword Currently, the use of light-alloy piston materials is more limited than it was twenty years ago, for the general purpose pistons normally used in marine and stationary burned-oil four-stroke diesel engines. Especially under high pressure, heat load larger case, the restrictions of these materials is particularly evident. Moreover, it is not possible to avoid mechanical wear on the end ring groove back caused by solid combustion residues. In order to overcome the above constraints, a combination piston has been developed that combines the advantageous properties of different materials with materials that are most suitable for use in critical load areas. For pistons used to burn heavy oil engines, the combined piston design, consisting of a forged steel top and a forged light alloy skirt, has become the world’s leading design. However, in order to be successfully applied in the future, the combined piston design still needs to be improved to meet the diesel engine burned to it