Rough rolling mill hole pattern for rolling H-shaped steel

Abstract

The invention belongs to the technical field of rolling of hot-rolled section steel, and particularly relates to a rough rolling mill pass for rolling H-shaped steel. High yield and low consumption of the H-shaped steel are realized, and the production efficiency is greatly improved. The rolling mill is formed by splicing an upper horizontal roller and a lower horizontal roller of a rough rolling mill, and a rolling mill hole pattern comprises a closed hole and a special-shaped hole located in the left side of the closed hole; the closed hole comprises a first closed hole and a second closed hole which are the same in structure, and the first closed hole is communicated with the second closed hole through a first horizontal communicating hole; the special-shaped holes comprise a first special-shaped hole and a second special-shaped hole which are the same in structure, and the first special-shaped hole and the second special-shaped hole are communicated through a second horizontal communicating hole; and the closed hole is not communicated with the special-shaped hole.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled section steel rolling, and in particular relates to a rough rolling mill pass for rolling H-section steel. Background technique [0002] H-beam is a new type of economical construction steel, which is widely used in many fields. The section shape of H-beam is economical and reasonable and has good mechanical properties. During rolling, the extension of each point on the section is relatively uniform and the internal stress is small; compared with ordinary I-beam, it has the advantages of large section modulus, light weight and metal saving. Lighten building structure by 30-40%. In addition, because the inner and outer sides of the legs are parallel, and the legs are at right angles, they can be assembled into structural parts, which can save welding and riveting workload by 25%; it is often used in large buildings and prefabricated steel structures that require large bearing capacity and good ...

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Problems solved by technology

[0004] When rolling medium-sized H-beams and selecting rectangular billets, generally the compression ratio of the billet to the finished product should be above 4:1, and the height of the billet to the flange height of the finished product should be above 1.6:1. It must be above 320mm; the heating furnace needs a higher temperature and a longer time in the furnace to heat the large rectangular billet, and the rough rolling needs to be rolled in 9 or 7 passes, which greatly reduces the production efficiency

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