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在机床结构中,有相当一部份是铸铁材料。铸件质量的好坏将直接影响到机床的性能。我国现在所用的机床铸铁与国外相比,在铸铁级别、工艺性能方面均存在着一定的差距。到目前为止,我国的机床行业还有相当部份的工厂使用HT20—40作机床部件,仅有少数工厂开始采用HT30—54铸铁作机床床身。但铸铁孕育处理技术落后,熔炼水平低,所以与国外同类牌号铸铁相比,有以下两个主要差距: (1) 铸铁的综合机械性能低。铸件本身性能与单独浇注试样相比要低2～3个级别。由于用75FeSi孕
In the machine structure, a considerable part of the cast iron material. Casting quality will directly affect the performance of the machine tool. China is now used in machine tool cast iron compared with foreign countries, there is a certain gap in the cast iron level, process performance. So far, there are quite a few factories in China’s machine tool industry that use the HT20-40 as a machine tool part. Only a few factories started to use the HT30-54 cast iron as a machine bed. However, the technology behind the inoculation of cast iron is backward and the smelting level is low. Therefore, compared with the foreign similar grades of cast iron, there are two main differences as follows: (1) The comprehensive mechanical properties of cast iron are low. Casting itself compared with the performance of casting samples to be 2 to 3 levels lower. As with 75FeSi pregnancy