A kind of processing method of hot-rolled ribbed steel bar

Abstract

The invention relates to a processing method of hot-rolled ribbed steel bars, which includes the steps of heating, rough rolling, intermediate rolling, finishing rolling, water cooling, segmental shearing, cooling bed cooling, and cut-to-length cutting. , reduce the depth of the transverse rib groove of the K1 rolling mill, and reduce the cross-sectional area of ​​the roll holes of the K2 rolling mill, K3 rolling mill and K4 rolling mill. The invention designs the parameters of the roll holes of each rolling mill and the depth of the transverse rib grooves of the finished rolling mill roll holes, so that the filling degree in each roll hole during the finishing rolling process of the rolled piece can be full, and the volume of the cut strip can be effectively reduced , thereby reducing the occurrence of elbow punching exit failures, effectively improving the stability and product quality of the production process of hot-rolled ribbed steel bars.

Description

technical field [0001] The invention relates to the technical field of processing hot-rolled ribbed steel bars, more specifically, it relates to a processing method for hot-rolled ribbed steel bars. Background technique [0002] Hot-rolled ribbed steel bar, commonly known as rebar, is widely used in civil engineering construction such as houses, bridges, and roads. It is an indispensable structural material. With the vigorous development of civil engineering in recent years, the demand for rebar is increasing. [0003] At present, the special rolling factory mainly adopts the rolling method when producing hot-rolled ribbed steel bars. The specific process is to send the qualified continuous casting slabs into the walking beam heating furnace through the furnace roller table and heat them to the specified temperature. The final continuous casting slab is first rolled in the rough rolling unit for 6 passes for rough rolling. After the rough rolling is completed, the head (tail...

AI Technical Summary

Problems solved by technology

In the common finishing rolling mill, the rolling mill before the finished rolling mill, commonly known as the K2 rolling mill or the guide device at the exit of the 17# rolling mill, has a torsion angle. The rolled piece stands up after exiting the K2 rolling mill, and then bites into the roll hole of the K1 rolling mill. After the steel head bites into the K1 rolling mill, the temperature of the cut strip is high and the temperature on the other side is low, so the rolled piece tends to have a low temperature. The direction of bending occurs, resulting in the failure of the outlet of the elbow punch

[0007] The second is that in the existing finishing rolling mill, the depth of the transverse rib groove of the roll hole of the K1 rolling mill adopts the standard design of positive deviation, and the depth of the transverse rib groove of the roll hole of the K1 rolling mill is relatively deep. The size of the roll hole of the rolling mill is enlarged to increase the size of the incoming material of the K1 rolling mill, so as to ensure that the transverse rib grooves in the K1 rolling mill are filled. The larger size of the incoming material of the K1 rolling mill will cause the reduction of the K1 rolling mill to be too large, which will cause As a result, the extrusion force on both sides of the transverse rib groove on the rolled piece is too large during the rolling process. In addition, there is asymmetry between the upper and lower transverse rib grooves of the roll hole of the K1 rolling mill. After the rolled piece bites into the roll hole of the K1 rolling mill, it will Bending in the direction of the roll that fills the transverse rib groove first, which will also cause the failure of the elbow punching outlet

[0008] To sum up, in the existing production process of hot-rolled ribbed steel bars, due to the unreasonable temperature difference of the cutting strip and the unreasonable depth of the transverse rib groove, the failure of the elbow punching outlet is prone to occur, which seriously affects the production of hot-rolled ribbed steel bars. Production process stability and product quality

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