JPS633682B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a rolling mill for steel plates, which is relatively compact, capable of high rolling reduction, and has excellent quality.
This invention relates to a high reduction rolling mill that exhibits excellent effects in terms of productivity.

Conventional technology Rolling mills for steel plates include hot rough rolling mills, finishing rolling mills, temper rolling mills, etc. Hot rolling mills usually include double rolling mills and quadruple rolling mills, and cold rolling mills. A 4-layer rolling mill and a 6-layer rolling mill are used for the inter-rolling mill, and a 4-layer rolling mill is used for the temper rolling mill, and both the hot rolling line and the cold rolling line are It consists of multiple machines installed. Further, a normal rolling mill is used for temper rolling, and a normal rolling mill is also used for scale breaking. However, equipment costs for such rolling mill equipment are high.

Therefore, as a method for reducing the cost of rolling mill equipment, it is generally possible to use a high reduction rolling mill to simplify the equipment.

As conventional hard reduction rolling mills, in addition to the above-mentioned six-layer rolling mill, multi-layer mills and planetary mills are known. The 6-layer rolling mill was developed as a high-reduction rolling mill with a high degree of shape controllability.
The multiplex type is commonly used as a rolling mill for silicon steel plates and stainless steel plates, and a planetary mill is constructed by arranging a large number of small diameter working rolls in a planetary pattern around upper and lower reinforcing rolls.

Problems with the prior art However, in the conventional hard reduction rolling mills such as the six-layer, multiple-layer, and planetary mills, the hard reduction characteristics of the six-layer rolling mill are only about 50%, and the structure of the multiple-layer rolling mill is The drawback is that it is technically complex and the roll changeover process takes time. In addition, in the case of a planetary mill, compared to a normal mill, the edge shape is more likely to form V-grooves of several millimeters, which causes edge cracks to occur more frequently, and the productivity is low, so it is only suitable for rolling small quantities of a wide variety of products. Furthermore, the vibration and noise during rolling are greater than other mills, and special consideration must be taken to prevent vibrations.The mechanism is complex, requiring advanced technology for operation and maintenance, and it takes time to rearrange and adjust the rolls. It has disadvantages such as being expensive. Therefore,
It has been extremely difficult to simplify rolling mill equipment using conventional high reduction rolling mills.

This invention has been made to solve the above-mentioned conventional problems, and aims to provide a high reduction rolling mill that can simplify rolling mill equipment and reduce equipment costs.

Means for Solving the Problems The high reduction rolling mill according to the present invention is basically a leveler used for straightening the flatness of steel plates, which is given a rolling function. A plurality of large-diameter work rolls are arranged in a leveler shape with a roll bite between the upper and lower work rolls, and at least one back-up roll is arranged around each of the upper and lower work rolls. It is characterized by being equipped with an up-roll housing lowering device.

That is, the high reduction rolling mill according to the present invention is of a type in which the material is rolled by the roll bite portions of the upper and lower work roll groups arranged in a leveler shape.

Function: In the case of the so-called leveler mill of the present invention, rolling is performed while undergoing plastic bending at each roll bit part created between the upper and lower work rolls, reducing rolling force, and since it has a leveling structure, Compared to 6-layer rolling mills, etc., this rolling mill has a compact rolling area, yet has the characteristic of being able to roll more.
The load per pair of rolls is reduced, and conversely, it means that the pressure can be reduced by that much, 90% in one pass.
It becomes possible to perform rolling at a higher reduction rate. Furthermore, the surface quality of the plate edge is good, and if the load reduction per pass is taken advantage of, heat scratches can be reduced, the speed of the rolling mill can be increased, and there are no particular problems with the rolling rate.
In addition, when this rolling mill is used to roll, for example, a hot-rolled black-skinned coil, the surface scale undergoes repeated plastic deformation due to bending and tensile rolling due to the leveling effect, so it can also be used as a scale-breaking mill to improve descaling performance. There are advantages that can be achieved.

Figure 1 shows an example of this leveler mill, where T ₁ to _{T 5} are upper work rolls, B ₁ to _{B 4} are lower work rolls, and LT ₁ to _{LT 5} are upper back up rolls with a built-in rolling down device. LB ₁ to _{LB 4} are lower back up rolls with built-in lowering devices, L ₁ to L 5 are upper back up rolls, and L ₁₁ to _{L 5} are lower back up rolls.
L ₁₄ indicates the lower back up profile, respectively.

That is, the upper work rolls T ₁ to T ₅ and the lower work rolls B ₁ to _{B 4} are supported by jocks so as to be driven independently. Further, the upper small-diameter back-up rolls L ₁ to _{L 5} are supported by chock LT ₁ to _{LT 5} having arcuate surfaces concentric with the upper work roll, and the lower small-diameter back-up rolls L ₁₁ to L ₁₄
A chock with an arcuate surface concentric with the lower work roll
It is supported by LB ₁ to _{LB 4} , and each chock of the upper and lower work rolls and the upper and lower back-up rolls is entirely supported by a housing (not shown). A small-diameter backup roll provided for each work roll is rotated by the drive of the work roll, and roll bites A ₁ to _{A 8} are created by a rolling down device installed at the chock of the backup roll.

In the case of the different circumferential speed rolling mill shown in FIG. 1, the rolling reduction rate is determined from the rolling reduction distribution at eight rolling locations. When the rolling reduction ratio is ri, the rolling reduction ratios at the eight rolling locations are r1 to r8, and when the plate thickness is hi, the plate thickness at each rolling location is h1 to h8. Furthermore, if the speed of each roll during rolling at different circumferential speeds in which the speed of adjacent rolls increases sequentially is Vi, the speed of the rolls at each rolling location is V ₁ <V ₂ <V ₃ <V ₄ <V ₅ ...<V ₈ Therefore, the slip area that can be rolled is 1.0<V ₂ /V ¹ , V ₃ /V ₂ , V ₄ /V ₃ , V ₅ /V ₄ , V ₆ /V ₅ , V ₇
The speed of each work roll is controlled so as to satisfy the following conditions: /V ₆ , V ₈ /V ₇ <1.4. Therefore, if the base material thickness is H ₀ and the entrance plate speed is V ₀ , the relationship between plate thickness and roll speed is as follows.
H ₀ V ₀ ≧h _i+1 V _i+1 (i=1 to 7).

Embodiment FIG. 2 shows an embodiment of this invention.
0 is a continuous casting device, 11 is a leveler mill for hot rough rolling, 12 is a leveler mill for hot finishing, 13 is a cooling zone, 14 is a leveler mill for descaling, 15 is a brushing equipment for descaling, and 16 is a leveler mill for cold rolling. , 17 is a continuous annealing facility, 18 is a leveler mill for skin pass rolling, and 19 is a coiler. In this rolling mill equipment, the hot finish rolling leveler mill 11 and the hot finish rolling leveler mill 12 both perform heavy reduction rolling, the descaling leveler mill 14 performs light reduction rolling, and the cold rolling leveler mill 1
6 performs heavy reduction rolling, and the leveler mill 18 for temper rolling performs light reduction rolling.

Effects of the Invention In the case of the strong reduction rolling mill of the present invention, a high reduction rate can be obtained even though the equipment is compact as described above, so the equipment cost for both hot and cold rolling is low. In addition, when this leveler mill is applied for descaling,
Large scale descaling can be performed under light pressure of 10% or less, which not only reduces equipment costs, but also enables more effective descaling when brushing equipment is installed in the post-process and used in conjunction with a leveler mill. Furthermore, by applying the present leveler mill in the temper rolling process, the purpose can be sufficiently achieved with a light rolling reduction, and there is an advantage that the equipment cost is lower than that of conventional equipment.

Although we have explained here an example of rolling mill equipment for manufacturing steel plates from continuous cast slabs, it goes without saying that similar effects can be obtained by applying this leveler mill to a disassembly rolling mill for steel ingots. Nor.

As mentioned above, according to the present invention, rolling mill equipment for manufacturing steel sheets can be significantly simplified, reducing equipment costs, and is expected to be as effective as a regular rolling mill in terms of quality and productivity. can.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a high reduction rolling mill according to the present invention, and FIG. 2 is an explanatory diagram showing an embodiment of the present invention. T ₁ to _{T 5} ... Upper work roll, B ₁ to _{B 4} ... Lower work roll, LT ₁ to _{LT 5} ... Upper back-up roll housing, LB ₁ to _{LB 4} ... Lower back-up roll housing, L ₁ ~L ₅ ……Upper backup roll, L ₁₁ ~L ₁₄ ……Lower backup roll, A ₁
~A ₈ ... Roll bite, 11... Leveler mill for hot rough pressure, 12... Leveler mill for hot finishing, 1
3... Cooling zone, 14... Leveler mill for descaling, 15... Brushing equipment for descaling, 1
6... Leveler mill for cold rolling, 17... Continuous annealing equipment, 18... Leveler mill for temper rolling, 19...
Koila.

Claims (1)

[Claims] 1 A group of multiple large-diameter work rolls arranged at regular intervals is arranged in a leveler shape with a roll bite between the upper and lower parts, and at least one back-up roll is arranged around each of the upper and lower work rolls. , a strong reduction rolling mill characterized in that a reduction device is provided in each of the upper and lower back-up roll housings.