Devices for coiling and unwinding hot-rolled rods

Abstract

The present invention provides a device for coiling and uncoiling a bar between a roughing mill and a finishing mill when performing hot rolling, the device comprising: a sealed furnace which is arranged between the roughing mill and the finishing mill, heats the bar received therein, and keeps the bar at a constant temperature; a pinch rolling unit which is arranged in front of the sealed furnace and controls the vertical progression direction of the bar provided by the roughing mill; a bending unit which is provided with the bar by the pinch rolling unit and bends the bar; and a cradling unit which receives the bent bar from the bending unit, and coils the bar along the rotation direction or uncoils the bar to the outside of the sealed furnace.

Description

technical field [0001] The present invention relates to a device for coiling and unwinding a hot-rolled bar from molten steel, and more particularly to a device arranged between a roughing mill and a finishing mill and capable of coiling and unwinding a hot-rolled bar while maintaining the temperature of the hot-rolled bar material device. Background technique [0002] figure 1 is a schematic diagram showing a series of equipment components for producing hot rolled coils from molten steel. [0003] like figure 1 As shown in (a), in the process of direct production of hot-rolled coils from molten steel, that is, in a production process comprising a directly connected continuous caster, roughing mill 10, finishing mill 20, and downcoiler 40, as figure 1 The coiling / unwinding device 50 shown in (b) is arranged between the roughing mill 10 and the finishing mill 20 according to the characteristics of the process in order to eliminate the gap between the roughing mill 10 and t...

AI Technical Summary

Problems solved by technology

in such as figure 2 In the turntable rotating mandrel type coiling / unwinding device shown in , the temperature of the area of ​​the rod 1 directly in contact with the mandrel decreases due to the contact with the mandrel, which causes the mass and material flow of the rod 1 to become uneven problem

In addition, due to the part where the temperature of the bar material 1 is lowered, distortion occurs in the finish rolling mill 20 or the thickness and shape are deformed

In addition, this kind of equipment has the following problems: the durability is reduced due to the complexity of the equipment to be operated and failures occur frequently, and the productivity is reduced due to the rotation time of the turntable 56 and the operation time of the device for guiding the bar 1

In addition, since it takes a long time to move the carrier roller 64, productivity decreases

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