我厂是生产印刷机械的专业厂家之一,灰铸铁件无论从数量、重量上在整机零件中均占有很大比例。铸件最大壁厚110mm,最小壁厚3～4mm,最大重量2t,最小重量不到lkg。以前,我厂采用冲天炉熔炼,层焦比1:15～1:13,出铁温度1380～1420℃,硅碳比控制在0.4～0.6,通过降低碳当量来提高铸件的强度。随着工业技术的向前发展,印刷机械也在向多色、多用、高速、轻型化方面发展。这对印刷机械的铸铁件来说,无疑也提 I plant is the production of professional printing machinery manufacturers, gray cast iron in terms of quantity and weight in the whole machine parts account for a large proportion. Casting the maximum wall thickness of 110mm, the minimum wall thickness of 3 ~ 4mm, the maximum weight of 2t, the minimum weight of less than lkg. In the past, our factory adopted the cupola furnace melting, layer coke ratio 1:15 ~ 1:13, tapping temperature 1380 ~ 1420 ℃, silicon carbon ratio control in 0.4 ~ 0.6, by reducing the carbon equivalent to improve the strength of the casting. With the development of industrial technology, printing machinery is also to the development of multi-color, multi-purpose, high speed, light weight. This is no doubt about the cast iron parts of printing machinery