JPH0257448B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for winding thin slabs (thickness 20 mm to 80 mm) cast by a continuous thin slab casting machine such as a twin belt caster. This relates to a coiler that can be wound as is without using a mandrel (see Figure 2).

[Conventional technology]

Traditionally, at Koira, bending rolls are
Either the upper and lower rolls are driven by two motors via a speed reducer and gear mechanism to bend the slab to a predetermined curvature, or the upper and lower rolls are driven independently by separate drive systems. After the slab is bent to a predetermined curvature, it is wound onto a winding mandrel.

[Problem that the invention seeks to solve]

However, in the former case, power circulation occurs due to the difference in the inner and outer circumferential speeds of the slab during driving, resulting in excessive torque and instability in the drive shaft system.

In the latter case, it is necessary to control the speed of each roll depending on the slab thickness, bending radius, and roll thickness.

Additionally, in order to improve the quality of the slab in continuous casting machines for thin slabs, it is essential to control the level of the molten metal, and this control is performed by adjusting the speed of the pinch rolls, but of course the speed control of the bending rolls is also used for this purpose. I get influenced by it. Moreover, when winding a thick thin slab onto a mandrel, an extremely large winding driving force is required.

An object of the present invention is to provide a coiler for a continuous thin slab caster that does not generate power circulation, does not require a complicated roll speed control mechanism, and does not require a winding mandrel.

[Means to solve the problem]

In this invention, a pinch roll that pinches the thin cast slab being conveyed in a continuous thin cast slab casting machine and sends it out to a later stage, a rotatable entrance gate that receives and guides the thin cast slab sent out from the outer pinch roll, A bending roll consisting of three upper and lower non-driven rolls provided after the entrance gate, a gap adjustment device between the upper and lower rolls provided close to the upper and lower rolls of the bending roll, and a bending roll made of the bending roll. It is characterized by comprising a cradle roll that receives and drives the bent slab.

〔Example〕

The present invention will be explained below with reference to Examples.

FIG. 1 is a schematic diagram showing the entire coiler for a thin slab continuous casting machine according to the present invention, and reference number 1 indicates a slab cast by, for example, a twin belt type or drum type thin slab continuous casting machine. , and is fed into the coiler body by the pinch roll 2 via the hydraulic shear 3. There is an entrance gate 4 at the entrance of the coiler body.
is provided to feed the slab 1 into the coiler body. The entrance gate 4 consists of a frame 20 and a non-driven entrance roll 21 and an exit roll 22 provided on the frame 20, and is controlled by a hydraulic cylinder 23 attached to the lower part of the frame 20. The frame 20 is rotatably held around the end pin portion.

Furthermore, non-driven bending rolls 7 and 8 are provided downstream of the entrance gate 4. The bending rolls 7, 8 are composed of one upper roll 8 and two lower rolls 7, each of which is attached to a frame 24. The frame 24 is rotatably held by a hydraulic cylinder 25 attached to the lower part of the frame 24 about a pin portion at the inlet end of the frame 24. Further, a worm jack 6 is provided adjacent to the bending rolls 7 and 8, and the gap between the upper roll 8 and the lower roll 7 can be adjusted by a gap adjustment device composed of a hydraulic cylinder 25 and a worm jack 6. It's becoming like that.

Therefore, the slab 1 is bent to a predetermined curvature by adjusting the gap between the upper and lower rolls. Then, the bent slab 1 further advances within the coiler body to approximately 1
A cradle roll 9 is provided at a rotating location. In addition, a slab presser roll 10 whose position can be adjusted is placed directly above the center of the coil sent to the cradle roll 9.
is provided, and its operation provides sufficient friction between the coil and the cradle roll 9 for winding.

Next, its effect will be explained.

The top of a slab 1 fed out by a pinch roll 2 at the latter stage of a continuous thin slab casting machine is pushed between the rolls along a guide between non-driven bending rolls 7 and 8 with a preset gap. Here, pinch roll 2 and bending rolls 7 and 8
Since the slab 1 between the two is warped in a concave manner, there is no risk of buckling, but it is preferable to provide a guide roll or the like (not shown) to prevent buckling just in case.

The slab 1 bent by the bending rolls 7 and 8 to a surface bending strain of 2 to 6% is transferred to a cradle roll which is rotated at a circumferential speed of 105 to 130% of the initial speed fed by the pinch rolls 2. 9 to form a coil. As the outer diameter of the coil increases, the worm jack 6 is operated to adjust the gap between the bending rolls 7 and 8 in the direction of opening, thereby increasing the bending curvature and minimizing the work.

Then, just before the coil winding is completed, the coil tail portion is cut by the hydraulic shear 3. After that, the speed of the cradle roll 9 is increased and winding is performed at high speed.
At this time, the gaps of the bending rolls 7 and 8 are almost at their open limit, and the winding resistance caused by the cradle 9 is small.

Further, the slab pressing roll 10 not only increases the friction applied to the cradle roll 9, but also has the function of aligning the coil bottom portion with the outer diameter of the coil.
The coil that has been wound in this way is carried out by the conveying means, and the coiler waits in a position to receive the next slab.

In the above embodiments, a so-called up coiler was described, but it goes without saying that a down coiler system is also applicable.

〔effect〕

Because of the above configuration, there is no power circulation between the upper and lower bending rolls as in the prior art, and there is no need to adjust the roll speed according to the slab thickness, slab bending radius, and coil winding thickness.

Furthermore, since no driving mechanism for the bending roll is omitted, it is lightweight and compact, and since a winding mandrel is not required, costs can be reduced, which is a significant effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of a coiler for a continuous thin cast slab casting machine according to the present invention, and FIG. 2 is an overall schematic diagram of a thin cast continuous casting equipment including a coiler to which the present invention is applied. 6... Worm jack, 7, 8... Non-driven bending roll, 9... Cradle roll,
10... Presser roll.

Claims (1)

[Claims] 1. A pinch roll that pinches the thin slab conveyed in a continuous thin slab casting machine and sends it out to a later stage, a rotatable entrance gate that receives and guides the thin slab sent out from the pinch roll, and the entrance gate. A bending roll consisting of three upper and lower non-driven rolls provided at the rear stage, a gap adjustment device between the upper and lower rolls provided close to the upper and lower rolls of the bending roll, and a bending roll that is bent by the bending roll. A coiler for a continuous caster for thin slabs, characterized by comprising a cradle roll that receives and drives slabs.