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一、概况用砂型铸造的普通球墨铸铁铸件,随着毛坯断面尺寸的增大,其铸造质量也就难以保证,我厂70年开始生产4L20/8空压机曲轴
First, the general use of sand cast ordinary ductile iron castings, with the rough section size increases, it is difficult to guarantee the quality of casting, I plant 70 years to start production 4L20 / 8 air compressor crankshaft