A production equipment suitable for hot-rolled zinc, aluminum, and magnesium materials

Abstract

This invention relates to a production equipment suitable for hot-rolled zinc-aluminum-magnesium materials, comprising a heating furnace, a high-pressure water descaling device, a roughing mill, a finishing mill, a laminar flow cooler, and a coiler arranged sequentially along the slab's forward direction. The roughing mill includes an E1 vertical rolling mill, an R1 flat rolling mill, an R2 flat rolling mill, an E2 vertical rolling mill, an R3 flat rolling mill, an R4 flat rolling mill, an E3 vertical rolling mill, and an R5 flat rolling mill arranged sequentially. The finishing mill includes an E4 vertical rolling mill, an F1 flat rolling mill, an F2 flat rolling mill, an F3 flat rolling mill, an F4 flat rolling mill, an F5 flat rolling mill, an F6 flat rolling mill, an F7 flat rolling mill, an F8 flat rolling mill, and an F9 flat rolling mill arranged sequentially. The roughing mill of this invention achieves one-time forming of hot-rolled slabs through three vertical and five horizontal roughing mills. Multi-stand double-roll rolling is beneficial for controlling the width accuracy of the roughing mill, resulting in high production efficiency, reducing the impact of temperature drop on rolling production, and reducing the output of secondary iron oxide scale. It is suitable for producing thick-gauge zinc-aluminum-magnesium hot-rolled materials.

Description

Technical Field

[0001] This invention belongs to the field of hot rolling technology of slabs, and specifically relates to a production equipment suitable for hot-rolled zinc-aluminum-magnesium materials. Background Technology

[0002] Hot-dip zinc-aluminum-magnesium alloy (HDA), as a new material for three-element coatings, has rapidly gained market acceptance due to its superior corrosion resistance. HDA requires higher surface quality from the hot-rolled substrate than other hot-dip coated sheets.

[0003] Currently, zinc, aluminum, and magnesium hot-rolled products are generally produced using traditional hot rolling processes, such as... Figure 1 As shown, the conventional hot rolling production line process is as follows: slab heating → high-pressure water descaling → reversible double-stand roughing mill (one vertical and one horizontal) → hot coil box → rotary shear → 7-stand finishing mill → laminar flow cooling → coiling. However, when producing hot-rolled zinc-aluminum-magnesium substrates with a thickness greater than 5.0mm, it was found that the hot-rolled zinc-aluminum-magnesium substrates produced by this process have problems such as poor surface quality, high production costs, and large deviations in plate convexity. Summary of the Invention

[0004] The purpose of this invention is to provide a production equipment suitable for hot-rolled zinc-aluminum-magnesium materials, which can shorten rolling time, reduce the output of secondary iron oxide scale, and achieve high surface quality;

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A production equipment suitable for hot-rolled zinc-aluminum-magnesium materials includes a heating furnace, a high-pressure water descaling device, a roughing mill, a finishing mill, a laminar flow cooler, and a coiler arranged sequentially along the slab's forward direction.

[0007] The roughing mill unit includes, in sequence, an E1 vertical rolling mill, an R1 horizontal rolling mill, an R2 horizontal rolling mill, an E2 vertical rolling mill, an R3 horizontal rolling mill, an R4 horizontal rolling mill, an E3 vertical rolling mill, and an R5 horizontal rolling mill. The R1, R2, R3, R4, and R5 horizontal rolling mills are all twin-roll mills.

[0008] The precision rolling mill unit includes, in sequence, an E4 vertical rolling mill, an F1 horizontal rolling mill, an F2 horizontal rolling mill, an F3 horizontal rolling mill, an F4 horizontal rolling mill, an F5 horizontal rolling mill, an F6 horizontal rolling mill, an F7 horizontal rolling mill, an F8 horizontal rolling mill, and an F9 horizontal rolling mill. The F1 horizontal rolling mill, F2 horizontal rolling mill, F3 horizontal rolling mill, F4 horizontal rolling mill, F5 horizontal rolling mill, F6 horizontal rolling mill, F7 horizontal rolling mill, F8 horizontal rolling mill, and F9 horizontal rolling mill are all four-high rolling mills.

[0009] Preferably, the working roll diameters of the R1, R2, R3, R4, and R5 flat roll mills are all 720-780 mm; the working roll diameters of the E1 and E2 vertical roll mills are all 600-650 mm; and the working roll diameter of the E3 vertical roll mill is 550-600 mm.

[0010] Preferably, the roughing mill rolls the slab to a thickness of 28-35 mm, and the temperature of the slab is controlled at 1000±30℃ after it leaves the R5 flat roll mill.

[0011] Preferably, the support roll diameter of the F1, F2, F3, F4, F5, F6, F7, F8, and F9 flat roll mills is 720-790 mm; the work roll diameter of the F1, F2, F3, and F4 flat roll mills is 400-440 mm; the work roll diameter of the F5, F6, F7, F8, and F9 flat roll mills is 360-400 mm; and the diameter of the E4 vertical roll mill is 550-600 mm.

[0012] Preferably, the threading speed of the finishing mill is 8 m / s, the temperature of the slab leaving the F9 flat roll mill is controlled at 850°C, and the maximum speed of the slab leaving the F9 flat roll mill is 16 m / s.

[0013] Preferably, an inlet rotary shear is provided between the roughing mill and the finishing mill.

[0014] The roughing mill of this invention achieves one-time forming of hot-rolled slabs through three vertical and five horizontal roughing mills and multi-stand double-roll rolling, which is conducive to the precise control of roughing width, high production efficiency, reduces the impact of temperature drop on rolling production, and reduces the output of secondary iron oxide scale. It is suitable for producing thick-gauge zinc-aluminum-magnesium hot-rolled materials and is more economical than reversible rolling and four-roll rolling.

[0015] The precision rolling mill of this invention shortens the precision rolling time by adopting a one-vertical-nine-horizontal continuous rolling process, reduces the contact time with air before coiling, which helps to reduce the formation of iron oxide scale, facilitates the control of plate crown and plate shape, and results in less iron oxide scale on the plate.

[0016] This invention employs a one-step forming process, which effectively improves rolling quality, resulting in shorter hot-rolled single-coil production time and lower energy consumption.

[0017] In this invention, the roughing process uses a twin-roll irreversible rolling process and does not require a hot rolling box. This results in low cost per process for hot-rolled zinc, aluminum, and magnesium base materials and reduces equipment operation and maintenance. Attached Figure Description

[0018] Figure 1This is a process flow diagram for a conventional hot rolling production line;

[0019] Figure 2 This is a flowchart of the production equipment for this invention.

[0020] Figure 3 Photographs of the surface of conventional zinc-aluminum-magnesium hot-rolled materials;

[0021] Figure 4 A photograph of the surface of the zinc-aluminum-magnesium hot-rolled material produced by the production equipment of this invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 2 As shown, the present invention provides a production equipment suitable for hot-rolled zinc-aluminum-magnesium materials, comprising a heating furnace, a high-pressure water descaling device, a roughing mill, a finishing mill, a laminar flow cooler, and a coiler arranged sequentially along the slab's forward direction.

[0024] The heating furnace is used to heat the slab to about 1250°C. The heated slab is then fed from the end of the heating furnace to the exiting roller conveyor by the tapping machine using an in-furnace roller conveyor. The high-pressure water descaling device removes the oxide scale from the surface of the slab.

[0025] The roughing mill unit includes, in sequence, an E1 vertical roll mill, an R1 horizontal roll mill, an R2 horizontal roll mill, an E2 vertical roll mill, an R3 horizontal roll mill, an R4 horizontal roll mill, an E3 vertical roll mill, and an R5 horizontal roll mill. The R1, R2, R3, R4, and R5 horizontal roll mills are all twin-roll mills used to roll the slab surface. The E1, E2, and E3 vertical roll mills are used to roll the slab side surface. While rolling, the slab width is kept uniform. The roughing mill rolls the slab to a thickness of 28-35mm. The final rolling temperature of the slab is controlled at 1000±30℃. The hot-rolled slab is formed in one step through three vertical and five horizontal roughing mills. Multi-stand double-roll rolling is beneficial for controlling the roughing width accuracy, has high production efficiency, reduces the impact of temperature drop on rolling production, and reduces the output of secondary iron oxide scale. It is suitable for producing thick-gauge zinc-aluminum-magnesium hot-rolled materials and is more economical than reversible rolling and four-roll rolling.

[0026] The working roll diameters of the R1, R2, R3, R4, and R5 flat roll mills are all 720-780mm, resulting in a large contact area with the workpiece and thus a larger rolling force. The working roll diameters of the E1 and E2 vertical roll mills are both 600-650mm, and the working roll diameter of the E3 vertical roll mill is 550-600mm.

[0027] The precision rolling mill unit includes, in sequence, an E4 vertical rolling mill, an F1 horizontal rolling mill, an F2 horizontal rolling mill, an F3 horizontal rolling mill, an F4 horizontal rolling mill, an F5 horizontal rolling mill, an F6 horizontal rolling mill, an F7 horizontal rolling mill, an F8 horizontal rolling mill, and an F9 horizontal rolling mill. The F1, F2, F3, F4, F5, F6, F7, F8, and F9 horizontal rolling mills are all four-high rolling mills. Hydraulic loopers can be installed between the units to ensure constant micro-tension rolling of the slab, ensuring the rolling accuracy of the slab. The final rolling temperature of the slab is controlled at 850℃, and the maximum final rolling speed of the slab is 16m / s. The finishing mill adopts speed-up rolling with a strip threading speed of 8m / s. By adopting one vertical and nine horizontal continuous rolling, the finishing rolling time is shortened, the contact time with air before coiling is reduced, which helps to reduce the formation of iron oxide scale and is beneficial to the control of plate crown and plate shape, resulting in less iron oxide scale on the plate.

[0028] The support roll diameters of the F1, F2, F3, F4, F5, F6, F7, F8, and F9 flat roll mills are 720-790 mm; the work roll diameters of the F1, F2, F3, and F4 flat roll mills are 400-440 mm; the work roll diameters of the F5, F6, F7, F8, and F9 flat roll mills are 360-400 mm; and the diameter of the E4 vertical roll mill is 550-600 mm.

[0029] The laminar flow cooler cools the rolled strip to achieve the target process temperature, and the temperature of the strip is controlled at 650±20℃ before coiling; the coiler coils the strip.

[0030] This invention employs a one-step forming process, which effectively improves the rolling level, reduces the production time of hot-rolled single coils (the conventional hot-rolled single coil rolling time is 300±25 seconds, while the hot-rolled single coil rolling time in this invention is 200±20 seconds, a reduction of 30%), and reduces energy consumption.

[0031] like Figure 3 and Figure 4 As shown, by comparing the surface photos of conventional zinc-aluminum-magnesium hot-rolled materials with those of the zinc-aluminum-magnesium hot-rolled materials produced by the equipment of this invention, it can be found that the iron oxide scale on the surface of the zinc-aluminum-magnesium hot-rolled materials produced by the equipment of this invention is effectively reduced.

[0032] In this embodiment, an inlet rotary shear is provided between the roughing mill and the finishing mill. The inlet rotary shear is used to remove the strip head and tail of the slab rolled by the roughing mill. The maximum shearing force of the inlet rotary shear is 4000KN and the maximum shearing thickness is 40mm.

Claims

1. A production equipment suitable for hot-rolled zinc-aluminum-magnesium materials, characterized in that, It includes a heating furnace, a high-pressure water descaling device, a roughing mill, a finishing mill, a laminar flow cooler, and a coiler, arranged sequentially along the slab's forward direction. The roughing mill unit includes, in sequence, an E1 vertical rolling mill, an R1 horizontal rolling mill, an R2 horizontal rolling mill, an E2 vertical rolling mill, an R3 horizontal rolling mill, an R4 horizontal rolling mill, an E3 vertical rolling mill, and an R5 horizontal rolling mill. The R1, R2, R3, R4, and R5 horizontal rolling mills are all twin-roll mills. The finishing mill unit includes, in sequence, an E4 vertical rolling mill, an F1 horizontal rolling mill, an F2 horizontal rolling mill, an F3 horizontal rolling mill, an F4 horizontal rolling mill, an F5 horizontal rolling mill, an F6 horizontal rolling mill, an F7 horizontal rolling mill, an F8 horizontal rolling mill, and an F9 horizontal rolling mill. The F1, F2, F3, F4, F5, F6, F7, F8, and F9 horizontal rolling mills are all four-high rolling mills. The working roll diameters of the R1, R2, R3, R4, and R5 flat roll mills are all 720-780 mm; the working roll diameters of the E1 and E2 vertical roll mills are all 600-650 mm; and the working roll diameter of the E3 vertical roll mill is 550-600 mm. The roughing mill rolls the slab to a thickness of 28-35 mm, and the temperature of the slab is controlled at 1000±30℃ after it leaves the R5 flat roll mill. The threading speed of the finishing mill is 8 m / s, the temperature of the slab leaving the F9 flat roll mill is controlled at 850°C, and the maximum speed of the slab leaving the F9 flat roll mill is 16 m / s.

2. The production equipment suitable for hot-rolled zinc-aluminum-magnesium materials according to claim 1, characterized in that, The support roll diameter of the F1, F2, F3, F4, F5, F6, F7, F8, and F9 flat roll mills is 720-790 mm; the work roll diameter of the F1, F2, F3, and F4 flat roll mills is 400-440 mm; the work roll diameter of the F5, F6, F7, F8, and F9 flat roll mills is 360-400 mm; and the diameter of the E4 vertical roll mill is 550-600 mm.

3. The production equipment suitable for hot-rolled zinc-aluminum-magnesium materials according to claim 1, characterized in that, An inlet hub shear is installed between the roughing mill and the finishing mill.

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