Development of design and process of stamping of air blast-furnace lances’s noses
DOI:
https://doi.org/10.31498/2225-6733.29.2014.39118Keywords:
blast tuyere, protective coating, sheet stampingAbstract
A design of air blast tuyere with protective iron coating was created. The front portion of the tuyere is made by stamping from copper slab with the thickness 15 mm. The author developed the technology of tuyere’s front. The technology enables to stamp the front part of the tuyere without blank holder to use the single-action hydraulic press force 2 MN. Stamped on the parts produced in the form of low surface waves. This surface improves the connection of cast iron with a copper piece. The front part of the tuyere with a larger height (length) is formed by stamping blanks from a solid copper. Increasing the height (length) of the front of the tuyere allows to move portions of its connection with conical bodies in areas with lower temperature heating. It increases the resistance welds in the compounds, and hence resistance tuyeres. Protection layer of cast iron surface stamping parts allows to reduce the thickness of the items in 2,5-7,5 times in comparison with the standard design of the tuyere. For applying a protective coating tuyere is dipped into the molten iron in an electric furnace. Iron appears only on the front side of the tuyere. Layer provides a strong connection with iron in the front portion of the tuyere. The author compared the experimental efforts with the efforts of stamping calculated by several formulas, and offered the most accurate formula. It also established equation for determining the height (length) of the front portion of the tuyere. For reliable welding tuyere front part by a conical casing is proposed to use a welding wire on the basis of nickel with additions of copper, iron, cobalt, and titanium, and to perform welding in a medium consisting of a mixture of argon and helium. Resistance of air blast tuyeres with a protective iron coating during operation exceeds the standard resistance of tuyeres on average 2,5 timesReferences
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