Production process of modified alloy ball iron roller

Abstract

The invention relates to a production process of a modified alloy ball iron roller, and is mainly characterized in that: V, Nb, Mo alloy is added into molten iron, which increases the microhardness and core toughness of the roller. A composite nodulizer of nickel magnesium alloy + copper magnesium alloy + magnesium silicon rare earth is adopted with a total adding amount of 1.0-2.0%; A composite inoculant of pure cerium rare earth + silicon calcium alloy + silicon zirconium alloy + 75 ferrosilicon + strontium silicon is adopted with a total adding amount of 5-10%, and the nodulizing treatmentquality of thick and large sections is increased. A large-scale spray quenching machine tool is used to perform spray quenching and forced cooling treatment of the roller, which increases the surfacehardness of the roller body of the roller. The application effect of the modified alloy ball iron roller is increased by 70-100% when compared with that of an alloy forged steel roller; cost is saved, and production security is guaranteed.

Description

technical field [0001] The invention relates to the field of mechanical engineering rolls and shafts, in particular to an improved production process for alloy ductile iron rolls. Background technique [0002] Alloy ductile iron roll is a wear-resistant casting product with a wide range of applications. According to different application fields and application conditions, the requirements for working layer hardness, wear resistance, strength toughness and accident resistance are different. In the prior art, the chemical components added to the raw materials are only Cr, Mn and Ni, and the overall casting technology is usually used to produce large alloy ductile iron rolls; during the casting process, a single-component Mg nodularizer and inoculant are added, and then Conventional positive tempering heat treatment. Because Cr, Mn and Ni are all hard, hard and brittle, the toughness of the core of the roll cannot meet the requirements; and Mg has the disadvantage of sharply d...

AI Technical Summary

Problems solved by technology

Because Cr, Mn and Ni are all hard, hard and brittle, the toughness of the core of the roll cannot meet the requirements; and Mg has the disadvantage of sharply declining centrifugal segregation, which causes serious spheroidizing decline, especially For diameters in The rolls between the ranges have more serious spheroidizing recession; at the same time, the traditional normal tempering heat treatment process is not ideal for the alloy ductile iron rolls with large cross-section and deep holes, and the hardness and metallographic structure of the roll body are not ideal. resulting in low hardness

[0003] Therefore, the alloy nodular iron roll produced by the existing alloy nodular iron roll production process has deficiencies in product quality, production safety and stability, and production cost.