Stainless steel continuous rolling unit

Abstract

The utility model relates to a stainless steel continuous rolling unit which comprises an uncoiling section device, a loop, a seven-rack continuous rolling mill, a cleaning machine and a coiling section device which are sequentially arranged in the rolling direction, a seven-rack four-roller rolling mill and a six-roller rolling mill are connected in series, and the four-roller rolling mill adopts large working roller diameter and working roller transmission. The six-roller mill adopts a small working roller diameter and a middle roller for transmission, so that large rolling reduction rolling in one rolling process is realized; dynamic plate shape regulation and control are achieved by combining online movement of a working roll positive bending roll, a middle roll positive bending roll and a middle roll; and the surface quality of the strip steel is further improved through squeezing, cleaning and drying at a rolling mill outlet. Compared with an eighteen-roller continuous rolling unit, the investment and the production and maintenance cost are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of strip steel rolling, and more specifically to a stainless steel continuous rolling mill group. Background Art

[0002] Stainless steel has a high resistance to cold rolling deformation and a significant tendency to work hardening. Conventional four-roll and six-roll mills have large working roll diameters, generally φ340mm. When rolling stainless steel, the rolling force is too large and the pressing capacity is insufficient. Therefore, a multi-roll mill with smaller working rolls, such as an eighteen-roll or twenty-roll mill, is usually used to roll stainless steel. In order to improve production efficiency and yield rate and reduce production costs, eighteen-roll continuous rolling mills have been used to produce stainless steel in recent years. However, the investment cost of eighteen-roll mills is high, the operation and maintenance are relatively complicated, and diagonal defects are easily generated on the surface of the strip during production. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a stainless steel continuous rolling mill unit, which can produce extremely thin specifications and high-quality cold-rolled stainless steel products, avoid the common plate surface diagonal defects of the eighteen-roll continuous rolling mill unit, and is easy to operate and maintain, thereby greatly reducing investment and production costs.

[0004] The utility model solves the technical problem by adopting a technical solution: constructing a stainless steel continuous rolling mill group, including an unwinding section device, a looper, a seven-stand continuous rolling mill, a cleaning machine and a coiling section device which are sequentially arranged along the rolling direction;

[0005] The uncoiler section equipment includes a first uncoiler, a first pinch and straightener, a second uncoiler, a second pinch and straightener, a double-layer shear and a converging and turning pinch roller; the first uncoiler and the second uncoiler are used for uncoiling steel coils; the first pinch and straightener and the second pinch and straightener are respectively located behind the first uncoiler and the second uncoiler, the double-layer shear is used for shearing unqualified parts of the strip head; the converging and turning pinch roller is used for feeding the steel coil strip head of the first uncoiler or the second uncoiler into the welding machine;

[0006] The seven-stand continuous rolling mill includes an F1 mill, an F2 mill, an F3 mill, an F4 mill, an F5 mill, an F6 mill and an F7 mill; the F1 mill and the F2 mill are four-roll mills, the F1 mill and the F2 mills are driven by working rolls, and the F1 mill and the F2 mills use positive bending rolls of working rolls to adjust the plate shape; the F3 mill, the F4 mill and the F5 mill are four-roll mills, the F3 mill, the F4 mill and the F5 mills are driven by working rolls, and the F3 mill, the F4 mill and the F5 mills use positive bending rolls of working rolls to adjust the plate shape; the F6 mill and the F7 mill are six-roll mills, the F6 mill and the F7 mills are driven by intermediate rolls, the intermediate rolls of the F6 mill and the F7 mills can move axially online, and the F6 mill and the F7 mills use positive bending rolls of intermediate rolls and positive bending rolls of working rolls to adjust the plate shape;

[0007] The coiling section equipment includes a tension roller group, a high-speed flying shear, a first outlet steering pinch roller, a first coiler, a second outlet steering pinch roller and a second coiler; the tension roller group is used to provide the outlet tension of the seven-stand continuous rolling mill; the high-speed flying shear is used to shear the strip during continuous rolling, the first coiler and the second coiler are used to coil the strip and establish the coiling tension; the first outlet steering pinch roller and the second outlet steering pinch roller are used to guide the strip head into the first coiler and the second coiler respectively.

[0008] In the above scheme, the welding machine is a fully automatic laser welding machine, which is used to shear, center and weld the head and tail of the front and rear rolls of steel strip.

[0009] In the above scheme, the loop is a horizontal loop, and tension roller groups are respectively arranged at the inlet and outlet of the loop to provide tension for the strip steel in the loop; deviation correction rollers are also respectively arranged at the inlet and outlet of the loop.

[0010] In the above scheme, the seven-stand continuous rolling mill adopts emulsion for cooling and lubrication, and the emulsion system includes S1 system, S2 system and S3 system; the S1 system is used for the emulsion circulation supply of F1 rolling mill, F2 rolling mill and F3 rolling mill, the S2 system is used for the emulsion circulation supply of F4 rolling mill and F5 rolling mill, and the S3 system is used for the emulsion circulation supply of F6 rolling mill and F7 rolling mill.

[0011] In the above scheme, the cleaning machine includes a strip wiper, an alkali spray tank, an alkali brush tank, a water spray tank, a water brush tank, a rinsing tank and a hot air dryer, which are used to remove residual emulsion and residual iron powder on the surface of the strip, and at the same time blow dry the moisture remaining on the surface of the strip at the outlet of the cleaning machine.

[0012] The implementation of the stainless steel continuous rolling mill of the utility model has the following beneficial effects:

[0013] The utility model stainless steel continuous rolling mill adopts a seven-stand four-roller mill and a six-roller mill in series. The four-roller mill adopts a large working roll diameter for large reduction rate rolling in the first few passes, and the six-roller mill adopts a small working roll diameter to solve the problem of work hardening of strip steel in the last few passes, breaking through the work roll diameter limitation of conventional rolling mills and realizing large reduction rolling in one rolling process; combined with the positive bending roll of the working roll, the positive bending roll of the intermediate roll, and the online movement of the intermediate roll, dynamic plate shape control is realized; the surface quality of the strip steel is further improved by squeezing, cleaning, and drying at the mill outlet. Compared with the 18-roller continuous rolling mill, the utility model greatly reduces the investment and production maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0015] Figure 1 This is a layout diagram of a stainless steel continuous rolling mill of the utility model;

[0016] In the figure: 1. First uncoiler; 2. First pinch and straightener; 3. Second uncoiler; 4. Second pinch and straightener; 5. Double-layer shear; 6. Converging and steering pinch roller; 7. Welding machine; 8. Horizontal looper; 9. First tension roller group; 10. Second tension roller group; 11. First deviation correction roller; 12. Second deviation correction roller; 13. Seven-stand continuous rolling mill; 14. Cleaning machine; 15. Third tension roller group; 16. High-speed flying shear; 17. First outlet steering pinch roller; 18. First coiler; 19. Second outlet steering pinch roller; 20. Second coiler. DETAILED DESCRIPTION

[0017] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0018] like Figure 1 As shown, the stainless steel continuous rolling mill group of the utility model comprises an unwinding section device, a looper, a seven-stand continuous rolling mill, a cleaning machine, and a coiling section device which are sequentially arranged along the rolling direction.

[0019] The equipment of the uncoiler section includes a first uncoiler 1, a first pinch and straightener 2, a second uncoiler 3, a second pinch and straightener 4, a double-layer shear 5, a converging and steering pinch roller 6, and a welder 7; the first uncoiler 1 and the second uncoiler 3 are used alternately to uncoil the steel coil and provide uncoiling tension; the first pinch and straightener 2 and the second pinch and straightener 4 are respectively located after the first uncoiler 1 and the second uncoiler 3, and are used to straighten the strip head; the double-layer shear 5 is used to shear the unqualified part of the strip head; the converging and steering pinch roller 6 is used to feed the steel coil strip head of the first uncoiler 1 or the second uncoiler 3 into the welder 7; the welder 7 adopts a fully automatic laser welder, which is used to shear, center and weld the head and tail of the front and rear two rolls of strip steel.

[0020] The looper is a horizontal looper 8, which can store eight layers of strip steel; the entrance and exit of the horizontal looper 8 are respectively provided with a first tension roller group 9 and a second tension roller group 10, which are used to provide tension for the strip steel in the looper; the entrance and exit of the horizontal looper 8 are also respectively provided with a first deviation correcting roller 11 and a second deviation correcting roller 12, which prevent the strip steel from deviating.

[0021] The seven-stand tandem rolling mill 13 includes an F1 rolling mill, an F2 rolling mill, an F3 rolling mill, an F4 rolling mill, an F5 rolling mill, an F6 rolling mill, and an F7 rolling mill.

[0022] The F1 and F2 rolling mills are four-high rolling mills, and the working roll diameters are both φ230mm.

[0023] The F1 and F2 rolling mills use working roll transmission.

[0024] The F1 and F2 rolling mills use positive bending of the working rolls to adjust the plate shape.

[0025] The F3, F4 and F5 rolling mills are four-roll mills, and the working roll diameters are all φ210mm.

[0026] The F3, F4 and F5 rolling mills use working roll transmission.

[0027] The F3, F4 and F5 mills use positive bending of the working rolls to adjust the plate shape.

[0028] The F6 and F7 rolling mills are six-high rolling mills, and the working roll diameters are both φ175mm.

[0029] The F6 and F7 rolling mills use intermediate roller transmission.

[0030] The intermediate rolls of F6 and F7 rolling mills can move axially online.

[0031] The F6 and F7 rolling mills use positive bending of the intermediate rolls and working rolls to adjust the plate shape.

[0032] The seven-stand continuous rolling mill 13 uses emulsion for cooling and lubrication, and the emulsion system includes S1 system, S2 system and S3 system; S1 system is used for the emulsion circulation supply of F1 rolling mill, F2 rolling mill and F3 rolling mill, S2 system is used for the emulsion circulation supply of F4 rolling mill and F5 rolling mill, and S3 system is used for the emulsion circulation supply of F6 rolling mill and F7 rolling mill.

[0033] The cleaning machine 14 includes a strip wiper, an alkali spray tank, an alkali brush tank, a water spray tank, a water brush tank, a rinsing tank and a hot air dryer, which are used to remove residual emulsion and residual iron powder on the surface of the strip, and at the same time dry the moisture remaining on the surface of the strip at the outlet of the cleaning machine to improve the surface quality of the strip.

[0034] The coiling section equipment includes a third tension roller group 15, a high-speed flying shear 16, a first outlet steering pinch roller 17, a first coiler 18, a second outlet steering pinch roller 19, and a second coiler 20; the third tension roller group 15 provides tension for the outlet of the seven-stand tandem mill 13; the high-speed flying shear 16 is used to shear the strip during continuous rolling, and the slitting speed can reach 200m / min; the first coiler 18 and the second coiler 20 are used alternately to coil the strip and establish coiling tension; the first outlet steering pinch roller 17 and the second outlet steering pinch roller 19 are used to guide the strip head into the first coiler 18 and the second coiler 20 respectively.

[0035] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. A stainless steel continuous rolling mill, characterized in that: It includes unwinding section equipment, looper, seven-stand continuous rolling mill, cleaning machine and coiling section equipment which are arranged in sequence along the rolling direction; The unwinding section equipment includes a first unwinding machine, a first pinch and straightening machine, a second unwinding machine, a second pinch and straightening machine, a double-layer shear and a converging and turning pinch roller; the first unwinding machine and the second unwinding machine are used for unwinding the steel coil; the first pinch and straightening machine and the second pinch and straightening machine are respectively located behind the first unwinding machine and the second unwinding machine, and the double-layer shear is used for shearing the unqualified part of the strip head; The converging and turning pinch roller is used to feed the steel coil head of the first uncoiler or the second uncoiler into the welding machine; The seven-stand continuous rolling mill includes an F1 mill, an F2 mill, an F3 mill, an F4 mill, an F5 mill, an F6 mill and an F7 mill; the F1 mill and the F2 mill are four-roll mills, the F1 mill and the F2 mills are driven by working rolls, and the F1 mill and the F2 mills use positive bending rolls of working rolls to adjust the plate shape; the F3 mill, the F4 mill and the F5 mill are four-roll mills, the F3 mill, the F4 mill and the F5 mills are driven by working rolls, and the F3 mill, the F4 mill and the F5 mills use positive bending rolls of working rolls to adjust the plate shape; the F6 mill and the F7 mill are six-roll mills, the F6 mill and the F7 mills are driven by intermediate rolls, the intermediate rolls of the F6 mill and the F7 mills can move axially online, and the F6 mill and the F7 mills use positive bending rolls of intermediate rolls and positive bending rolls of working rolls to adjust the plate shape; The coiling section equipment includes a tension roller group, a high-speed flying shear, a first outlet steering pinch roller, a first coiler, a second outlet steering pinch roller and a second coiler; the tension roller group is used to provide the outlet tension of the seven-stand continuous rolling mill; the high-speed flying shear is used to shear the strip during continuous rolling, the first coiler and the second coiler are used to coil the strip and establish the coiling tension; the first outlet steering pinch roller and the second outlet steering pinch roller are used to guide the strip head into the first coiler and the second coiler respectively.

2. The stainless steel continuous rolling mill according to claim 1, characterized in that: The welding machine is a fully automatic laser welding machine, which is used to shear, center and weld the head and tail of the front and rear rolls of steel strip.

3. The stainless steel continuous rolling mill according to claim 1, characterized in that: The loop is a horizontal loop, and tension roller groups are respectively arranged at the loop inlet and outlet to provide tension for the strip steel in the loop; deviation correction rollers are also respectively arranged at the loop inlet and outlet.

4. The stainless steel continuous rolling mill according to claim 1, characterized in that: The seven-stand continuous rolling mill adopts emulsion for cooling and lubrication, and the emulsion system includes S1 system, S2 system and S3 system; the S1 system is used for the emulsion circulation supply of F1 rolling mill, F2 rolling mill and F3 rolling mill, the S2 system is used for the emulsion circulation supply of F4 rolling mill and F5 rolling mill, and the S3 system is used for the emulsion circulation supply of F6 rolling mill and F7 rolling mill.

5. The stainless steel continuous rolling mill according to claim 1, characterized in that: The cleaning machine includes a strip steel wiper, an alkali spray tank, an alkali brush tank, a water spray tank, a water brush tank, a rinsing tank and a hot air dryer, which are used to remove residual emulsion and residual iron powder on the surface of the strip steel, and at the same time blow dry the moisture remaining on the surface of the strip steel at the outlet of the cleaning machine.

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