CN-122007148-A - Double high-speed bar flexible production line and bar production process

CN122007148ACN 122007148 ACN122007148 ACN 122007148ACN-122007148-A

Abstract

The application provides a double-high-speed bar flexible production line and a bar production process, wherein the double-high-speed bar flexible production line comprises a plurality of finish rolling lines, a rough rolling unit, a first flying shear, a middle rolling unit, a second flying shear, a pre-finish rolling unit and a first pre-water cooling device which are sequentially arranged, each finish rolling line comprises a diameter measuring instrument, a third flying shear, a first finish rolling unit, a second pre-water cooling device, a fourth flying shear, a second finish rolling unit, a third pre-water cooling device, a fifth flying shear, a third finish rolling unit and a water cooling device which are sequentially arranged, and a fourth pre-water cooling device is arranged between the first pre-water cooling device and the diameter measuring instrument of each finish rolling line. The double-high-speed bar flexible production line provided by the application has high structural reliability, and can realize high-speed rolling and cooling control, further ensure the product quality and realize the reduced green production of the hot-rolled steel bar alloy.

Inventors

ZHAO BO
LIU MINGWEI
LV PENG
MA ZHIYONG
YANG YONGQIANG

Assignees

中冶京诚工程技术有限公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (10)

1. A double high-speed bar flexible production line is characterized by comprising a plurality of finish rolling lines, a rough rolling unit, a first flying shear, a middle rolling unit, a second flying shear, a pre-finish rolling unit and a first pre-water cooling device which are sequentially arranged, Each finish rolling line comprises a diameter measuring instrument, a third flying shear, a first finish rolling machine group, a second pre-water cooling device, a fourth flying shear, a second finish rolling machine group, a third pre-water cooling device, a fifth flying shear, a third finish rolling machine group and a water cooling device which are sequentially arranged, wherein a fourth pre-water cooling device is arranged between the first pre-water cooling device and the diameter measuring instrument of each finish rolling line.
2. The flexible production line for double high-speed bars according to claim 1, wherein the roughing mill set comprises a plurality of roughing mills, and each roughing mill and the first flying shear are arranged in sequence.
3. The flexible production line for double high-speed bars according to claim 1, wherein the middle rolling mill group comprises a plurality of middle rolling mills, and the first flying shears, the middle rolling mills and the second flying shears are arranged in sequence.
4. The flexible production line for double high-speed bars according to claim 1, wherein the pre-finishing mill group comprises a plurality of pre-finishing mills, and the second flying shear arrangement, each pre-finishing mill and the first pre-water cooling device are arranged in sequence.
5. The dual high speed bar flexible production line of claim 1, wherein the roughing mill train, the intermediate mill train and the pre-finishing mill train all employ short stress line rolling mills.
6. The dual high-speed bar flexible production line according to claim 1, wherein roughing mills in the roughing mill group are arranged in a horizontal and vertical alternate arrangement, wherein intermediate rolling mills in the intermediate rolling mill group are arranged in a horizontal and vertical alternate arrangement, and wherein pre-finishing mills in the pre-finishing mill group are arranged in a horizontal, vertical, horizontal arrangement.
7. The dual high speed bar flexible production line according to claim 1, wherein the first finishing mill group in each finishing line comprises two finishing mills, the second finishing mill group comprises two finishing mills, and the third finishing mill group comprises two finishing mills.
8. The dual high-speed bar flexible production line according to claim 1, wherein the finishing mills in the first finishing mill group, the second finishing mill group and the third finishing mill group are all driven independently.
9. The dual high-speed bar flexible production line according to claim 1, wherein the number of roughing stands in the roughing mill group is six, the number of intermediate rolling stands in the intermediate rolling mill group is four, and the number of pre-finishing stands in the pre-finishing mill group is six.
10. A bar production process, characterized in that it is implemented by using the double high-speed bar flexible production line according to any one of claims 1 to 9, and comprises: The heated billet is sent into a roughing mill set for rolling, and enters a middle rolling mill set for rolling after passing through a first flying shear head; after passing through a second flying shear head, the billets rolled by the middle rolling mill group enter a pre-finishing mill group for slitting rolling to form a plurality of rolled pieces; And (3) respectively conveying each rolled piece into different finish rolling lines through a first pre-water cooling device, and sequentially forming bars through a corresponding fourth pre-water cooling device, a diameter measuring instrument, a third flying shear, a first finish rolling unit, a second pre-water cooling device, a fourth flying shear, a second finish rolling unit, a third pre-water cooling device, a fifth flying shear, a third finish rolling unit and a water cooling device by each rolled piece.

Description

Double high-speed bar flexible production line and bar production process Technical Field The application relates to the technical field of bar rolling, in particular to a double-high-speed bar flexible production line and a bar production process. Background With the improvement of the required productivity of the small-size ribbed steel bars, the single high-speed bar production process is developed into a double high-speed bar production process, namely, small-size rolled pieces are subjected to double segmentation and then respectively enter two independent finish rolling lines and a double high-speed steel feeding system. A typical dual high speed bar line roll zone process layout is shown in fig. 1. The main equipment comprises a rough rolling unit 1-1, a first flying shear 1-2, a middle rolling unit 1-3, a second flying shear 1-4, a pre-finishing mill unit 1-5, a first pre-water cooling device 1-6, a third flying shear 1-7, a first finishing mill unit 1-8, a second pre-water cooling device 1-9, a fourth flying shear 1-10, a second finishing mill unit 1-11 and a water cooling device 1-12. After being split-rolled in a middle rolling mill group, the rolled piece is sent to a double-line (A/B) pre-finishing mill group for rolling. And then the finished product is rolled out from the finishing mill group and then enters a water passing device. The two-wire device is configured identically and arranged side by side. The finish rolling 6 frames adopt a 2+4 arrangement scheme, each line is provided with 1 one-to-two modular rolling mill to form a first finishing mill group, and 2 one-to-two modular rolling mills to form a second finishing mill group. The two groups of finishing mills are arranged separately, and a pre-water cooling device is arranged in the middle. The 3 one-driving-two modular rolling mills in each line are all in centralized transmission, and the speed ratio is fixed. This arrangement suffers from the following disadvantages: From the investment aspect, the centralized transmission mechanism has complex structure, larger motor power and higher equipment and transmission investment. From the production aspect, the process adjustment is complex, the flexibility of extension is not high, and the temperature control is not accurate enough. From the product, the temperature rise of the rolled piece is too fast during high-speed rolling, which is unfavorable for fine grain structure and alloy decrement. Disclosure of Invention Aiming at least one problem in the prior art, the application provides a double-high-speed bar flexible production line and a bar production process, wherein the double-high-speed bar flexible production line has high structural reliability, can realize high-speed rolling and cooling control, further can ensure the product quality and realize the reduced green production of hot-rolled steel bar alloy. In order to solve the technical problems, the application provides the following technical scheme: The application provides a double high-speed bar flexible production line which comprises a plurality of finish rolling lines, a rough rolling unit, a first flying shear, a middle rolling unit, a second flying shear, a pre-finishing rolling unit and a first pre-water cooling device which are sequentially arranged, Each finish rolling line comprises a diameter measuring instrument, a third flying shear, a first finish rolling machine group, a second pre-water cooling device, a fourth flying shear, a second finish rolling machine group, a third pre-water cooling device, a fifth flying shear, a third finish rolling machine group and a water cooling device which are sequentially arranged, wherein a fourth pre-water cooling device is arranged between the first pre-water cooling device and the diameter measuring instrument of each finish rolling line. In one embodiment, the roughing mill set comprises a plurality of roughing mills, and each roughing mill and the first flying shears are arranged in sequence. In one embodiment, the middle rolling mill set comprises a plurality of middle rolling mills, and the first flying shears, the middle rolling mills and the second flying shears are arranged in sequence. In one embodiment, the pre-finishing mill group comprises a plurality of pre-finishing mills, and the second flying shear arrangement, each pre-finishing mill and the first pre-water cooling device are arranged in sequence. In one embodiment, the roughing mill train, the intermediate mill train, and the pre-finishing mill train each employ a short stress line mill. In one embodiment, roughing mills in the roughing mill train are arranged in a horizontal and vertical alternating arrangement, intermediate rolling mills in the intermediate rolling mill train are arranged in a horizontal and vertical alternating arrangement, and pre-finishing mills in the pre-finishing mill train are arranged in a horizontal, vertical, horizontal arrangement. In one embodiment, the first finishing trai