自1972年以来,我厂就应用稀土高强度铸铁铸造刀杆来代替原来的40钢锻造刀杆。经过几年的实践证明,这种铸铁刀杆,安全可靠,可焊性好,抗拉强度为40～52公斤/毫米~2,延伸率0.5～1.3%,完全可以满足车削抗力对刀杆的要求。它与锻造刀杆、可锻铸铁刀杆相比较,具有节省大量钢材、工艺简单、加工方便等特点,技术经济效果对比见下表。 Since 1972, our factory applied rare earth high strength cast iron arbor to replace the original 40 steel forged arbor. After several years of practice has proved that this cast iron arbor, safe and reliable, good weldability, tensile strength of 40 ~ 52 kg / mm ~ 2, elongation of 0.5 to 1.3%, fully meet the turning resistance of the arbor Claim. Compared with forged arbor and malleable cast iron arbor, it has the advantages of saving a large amount of steel, simple process and convenient processing. The comparison of technical and economical effects is shown in the following table.