Study on low cost and free cutting gray cast iron for engine cylinder block

The tensile strength of gray cast iron treated with 75 ferrosilicon inoculant is 6.5% lower than that of gray cast iron treated with Cu alloying, and the main cutting force is reduced by 3.7%, 7.7% and 4.2% respectively at three cutting depths of 1 mm, 1.25 mm and 1.5 mm.

Through alloying with multi alloy additives, the tensile strength of Gray Cast Iron Inoculated with 75sife, SRSI and basi meets the requirements of HT250, and the Brinell hardness and microhardness are equivalent, while the tensile strength of Gray Cast Iron Inoculated with SRSI is slightly lower than that of Gray Cast Iron Inoculated with 75sife and basi. The cutting resistance of Gray Cast Iron Inoculated with basi is the largest, the cutting performance is the worst, and 75sife is the second, The cutting performance of gray cast iron treated with SRSI is the best.

Under the same 75sife inoculation in different heats, when the tensile strength of gray cast iron alloyed with multi alloy additives is equivalent to that of Cu alloyed gray cast iron, the main cutting force of gray cast iron alloyed with multi alloy additives is 20.2% lower than that of Cu alloyed gray cast iron at three cutting depths of 1 mm, 1.25 mm and 1.5 mm respectively 13% and 15.8%.

When measuring the cutting force, both blade reassembly and blade replacement have an impact on the cutting force, but blade reassembly has little impact on the cutting force, and blade replacement has a greater impact on the cutting force.

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