Method for producing pickled plate steel coil by five-rack continuous mill

Abstract

The invention discloses a method for producing a pickled plate steel coil through a five-rack continuous rolling mill, and belongs to the technical field of steel plate production. The method specifically comprises the steps that (1) the roller distance between working roller sets of first to fourth rolling mills is adjusted to be larger than the thickness of a pickled plate; 2) shielding sensor signals of the first to fourth rolling mills, and closing emulsion nozzles of the first rolling mill, the second rolling mill, the third rolling mill and the fourth rolling mill; (3) replacing a working roller set of a fifth rolling mill with a roller set with the grinding convexity of 0 + / -5 microns; the method for producing the pickled plate steel coil through the five-rack continuous rolling mill comprises the steps of (1) adjusting the screw-down rate of a working roller set of the fifth rolling mill, (2) adjusting the screw-down rate of a working roller set of the fifth rolling mill to be smaller, (3) adjusting the liquid outlet rate of an emulsion nozzle of the fifth rolling mill to be smaller, and (4) shielding a thickness measuring signal of a thickness measuring instrument of a steel outlet of the fifth rolling mill to enable an existing five-rack continuous rolling mill to meet the requirement for producing the pickled plate steel coil.

Description

Technical Field

[0001] The invention belongs to the technical field of steel plate production, and relates to a method for processing pickled steel plates into pickled plate steel coils by using a five-stand continuous rolling mill. Background Art

[0002] The five-stand cold rolling mill is composed of a PLC controller, five tandem rolling mills, shears, coilers and other major mechanical equipment. There is no looper mechanism on the entire line. It is dedicated to the high-precision processing of cold-rolled metal plates (such as steel plates, stainless steel plates, aluminum plates, etc.). Its core function is to further thin the hot-rolled strip to the target thickness through multiple rolling passes. The five tandem rolling mills are Mill No. 1, Mill No. 2, Mill No. 3, Mill No. 4 and Mill No. 5. Each mill includes a working roll group, a support roll group, a sensor and an emulsion nozzle. The outlet of Mill No. 5 is equipped with a thickness gauge. The steel plate enters from the No. 1 rolling mill. After the sensor of the No. 1 rolling mill senses the signal of steel, its working roll group is pressed down and the emulsion nozzle starts to spray the emulsion. The steel plate that passes through the working roll of the No. 1 rolling mill for the first round of rolling enters the No. 2 rolling mill. After the sensor of the No. 2 rolling mill senses the signal of steel, its working roll group is pressed down and the emulsion nozzle starts to spray the emulsion. The steel plate that passes through the working roll of the No. 2 rolling mill for the second round of rolling enters the No. 3 rolling mill. After the sensor of the No. 3 rolling mill senses the signal of steel, its working roll group is pressed down and the emulsion nozzle starts to spray the emulsion. The steel plate that has passed the third round of rolling by the working roll of the No. 3 rolling mill enters the No. 4 rolling mill. After the sensor of the No. 4 rolling mill senses the steel signal, its working roll group is pressed down and the emulsion nozzle starts to spray emulsion. The steel plate that has passed the fourth round of rolling by the working roll of the No. 4 rolling mill enters the No. 5 rolling mill. After the sensor of the No. 5 rolling mill senses the steel signal, its working roll group is pressed down and the emulsion nozzle starts to spray emulsion. The steel plate that has passed the fifth round of rolling by the working roll of the No. 5 rolling mill is rolled into a steel coil by the coiler through a thickness gauge and then cut by a shearing machine to obtain a cold-rolled steel coil.

[0003] Pickled plate is an intermediate product whose surface quality and use requirements are between hot-rolled plate and cold-rolled plate after the oxide layer is removed by the pickling unit, trimming and finishing. It is an ideal substitute for some hot-rolled and cold-rolled plates. Compared with hot-rolled plates, the advantages of pickled plates are mainly good surface quality, easy welding, oiling and painting, and high dimensional accuracy. Compared with cold-rolled plates, the advantages of pickled plates are that the thickness standard of pickled plates is much smaller than that of cold-rolled plates under the premise of ensuring the use requirements of surface quality, and pickled plates do not need to undergo multiple rolling passes. As the market demand for pickled plates increases and the demand for cold-rolled plates decreases, the existing five-stand continuous rolling mill can only be used for continuous rolling of cold-rolled plate coils, and cannot be used for pickled plate rolling coils. The production of pickled plate coils requires the purchase of new rolling mills and coilers, which directly increases production costs. Summary of the invention

[0004] The problem solved by the present invention is to provide a method for producing pickled plate steel coils by a five-stand continuous rolling mill, so that the existing five-stand continuous rolling mill can meet the requirements of producing pickled plate steel coils.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: including a No. 1 rolling mill, a No. 2 rolling mill, a No. 3 rolling mill, a No. 4 rolling mill, a No. 5 rolling mill, a shearing machine and a coiler, all of which are connected to a PLC controller, the No. 1 rolling mill, the No. 2 rolling mill, the No. 3 rolling mill, the No. 4 rolling mill and the No. 5 rolling mill are all provided with a working roll group, a backup roll group, a sensor and an emulsion nozzle, and a thickness gauge is provided at the steel outlet of the No. 5 rolling mill. The specific method is: 1) adjusting the roll distance between the working roll groups of the No. 1 rolling mill to be larger than the thickness of the pickled plate, adjusting the roll distance between the working roll groups of the No. 2 rolling mill to be larger than the thickness of the pickled plate, adjusting the roll distance between the working roll groups of the No. 3 rolling mill to be larger than the thickness of the pickled plate, and adjusting the roll distance between the working roll groups of the No. 4 rolling mill to be larger than the thickness of the pickled plate, so that the pickled plate will not be rolled by the No. 1 rolling mill, the No. 2 rolling mill, the No. 3 rolling mill and the No. 4 rolling mill; 2) shielding the sensor signals of the No. 1 rolling mill, the No. 2 rolling mill, the No. 3 rolling mill and the No. 4 rolling mill, and closing the emulsion nozzles of the No. 1 rolling mill, the No. 2 rolling mill, the No. 3 rolling mill and the No. 4 rolling mill, so as to prevent the working roll groups of the No. 1 rolling mill, the No. 2 rolling mill, the No. 3 rolling mill and the No. 4 rolling mill from being pressed down and the emulsion nozzles from spraying the emulsion when the pickled plate passes through the No. 1 rolling mill, the No. 2 rolling mill, the No. 3 rolling mill and the No. 4 rolling mill; 3) replacing the working roll set of the No. 5 rolling mill with a roll set with a grinding crown of 0±5 μm; 4) Reduce the reduction rate of the working roll group of the No. 5 rolling mill. The grinding crown of the working roll group of the No. 5 rolling mill is 0±5μm, and its reduction rate needs to be reduced accordingly; 5) Reduce the liquid discharge rate of the emulsion nozzle of the No. 5 rolling mill, the reduction rate of the working roll group of the No. 5 rolling mill, and the emulsion used for lubrication and cooling also need to be reduced accordingly; 6) Shield the thickness measurement signal of the thickness gauge at the outlet of the No. 5 rolling mill. The thickness of the pickled plate does not need to reach the thickness of the cold-rolled plate. If the thickness gauge detects that the thickness of the plate rolled out from the outlet roller of the No. 5 rolling mill does not meet the cold-rolled plate thickness standard, an alarm will be issued.

[0006] In the above technical solution, a more specific technical solution can also be: the shearing machine is provided with a thickness tester, the thickness tester is connected to the PLC control, the thickness tester is used to monitor the thickness curve of the pickling plate, and the shearing machine cuts the weld of the pickling plate.

[0007] Furthermore: the coiling speed of the coiler is adjusted to 80m / min, and reducing the steel speed can enable the thickness tester to accurately monitor the thickness curve of the pickled plate.

[0008] Further: the roll spacing between the working roll groups of the No. 1 rolling mill is adjusted to 20 mm, the roll spacing between the working roll groups of the No. 2 rolling mill is adjusted to 16 mm, the roll spacing between the working roll groups of the No. 3 rolling mill is adjusted to 12 mm, and the roll spacing between the working roll groups of the No. 4 rolling mill is adjusted to 8 mm.

[0009] Further: the reduction parameter of the working roll group of the No. 5 rolling mill is set to 2.7mm rolling 1.9mm.

[0010] Further: the liquid output of the emulsion nozzle of the No. 5 rolling mill is set to 800L / min.

[0011] Due to the adoption of the above-mentioned technical scheme, the present invention has the following beneficial effects compared with the prior art: a production method suitable for pickled plate steel coils is developed by transforming the existing five-stand continuous rolling mill for producing cold-rolled plates, and the method can meet the efficient production requirements of pickled plates without purchasing new rolling mills and coilers; when the market demand for cold-rolled plates increases, it is only necessary to restore the original settings of the five-stand continuous rolling mill to produce cold-rolled plates, and it can change with changes in market demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the macroscopic arrangement of the present invention.

[0013] In the figure: 1. No. 1 rolling mill; 2. No. 2 rolling mill; 3. No. 3 rolling mill; 4. No. 4 rolling mill; 5. No. 5 rolling mill; 51. Thickness gauge; 6. Shearing machine; 7. Coiler; 8. Working roll group; 9. Support roll group. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings: like Figure 1 The method for producing pickled plate steel coils by a five-stand continuous rolling mill shown in the figure comprises a No. 1 rolling mill 1, a No. 2 rolling mill 2, a No. 3 rolling mill 3, a No. 4 rolling mill 4, a No. 5 rolling mill 5, a shearing machine 6 and a coiling machine 7, all of which are connected to a PLC controller. The No. 1 rolling mill 1, the No. 2 rolling mill 2, the No. 3 rolling mill 3, the No. 4 rolling mill 4 and the No. 5 rolling mill 5 are all provided with a working roll group 8, a backup roll group 9, a sensor and an emulsion nozzle, and a thickness gauge 51 is provided at the steel outlet of the No. 5 rolling mill 5. The specific method is as follows: 1) Adjust the roll spacing between the working roll groups 8 of the No. 1 rolling mill 1 to 20 mm, the roll spacing between the working roll groups 8 of the No. 2 rolling mill 2 to 16 mm, the roll spacing between the working roll groups 8 of the No. 3 rolling mill 3 to 12 mm, and the roll spacing between the working roll groups 8 of the No. 4 rolling mill 4 to 8 mm, so that the pickled plate will not be rolled by the No. 1 rolling mill 1, the No. 2 rolling mill 2, the No. 3 rolling mill 3 and the No. 4 rolling mill 4; 2) Shield the sensor signals of the No. 1 rolling mill 1, the No. 2 rolling mill 2, the No. 3 rolling mill 3 and the No. 4 rolling mill 4, and turn off the emulsion nozzles of the No. 1 rolling mill 1, the No. 2 rolling mill 2, the No. 3 rolling mill 3 and the No. 4 rolling mill 4 to prevent the working roll group 8 of the No. 1 rolling mill 1, the No. 2 rolling mill 2, the No. 3 rolling mill 3 and the No. 4 rolling mill 4 from being pressed down and the emulsion nozzles from spraying the emulsion when the pickled plate passes through the No. 1 rolling mill 1, the No. 2 rolling mill 2, the No. 3 rolling mill 3 and the No. 4 rolling mill 4; 3) Replace the working roll set 8 of the No. 5 rolling mill with a roll set with a grinding crown of 0±5μm; 4) Reduce the reduction rate of the working roll group 8 of the No. 5 rolling mill. The reduction parameter of the working roll group 8 of the No. 5 rolling mill is set to 2.7mm rolling 1.9mm. The grinding crown of the working roll group 8 of the No. 5 rolling mill is 0±5μm, and its reduction rate needs to be reduced accordingly; 5) Reduce the liquid discharge rate of the emulsion nozzle of the No. 5 rolling mill. The liquid discharge rate of the emulsion nozzle of the No. 5 rolling mill is set to 800L / min. The reduction rate of the working roll group 8 of the No. 5 rolling mill and the emulsion used for lubrication and cooling also need to be reduced accordingly; 6) Shield the thickness measurement signal of the tapping thickness gauge 51 of the No. 5 rolling mill. The thickness of the pickled plate does not need to reach the thickness of the cold-rolled plate. If the thickness gauge 51 detects that the thickness of the plate rolled out from the tapping roller of the No. 5 rolling mill does not meet the cold-rolled plate thickness standard, an alarm will be issued.

[0015] Shearing machine 6 is equipped with a thickness tester, which is connected to the PLC control and is used to monitor the thickness curve of the pickled plate. Shearing machine 6 cuts the weld of the pickled plate. The coiling speed of coiler 7 is adjusted to 80m / min. Reducing the steel feeding speed allows the thickness tester to accurately monitor the thickness curve of the pickled plate.

[0016] It should be noted that the PLC controller provided by the present invention is a common device in the prior art. It only needs to be connected through the connection relationship given in the embodiment of the present invention. The technical solution of the present invention can be obtained by conventionally setting the PLC controller, which does not involve any improvement in software programming. As for the parameter setting and use method of the PLC controller, those skilled in the art can purchase the PLC controller and refer to the accompanying instruction manual to achieve the corresponding control setting, which will not be described in detail here.

Claims

1. A method for producing pickled steel coils by a five-stand continuous rolling mill, comprising a No. 1 rolling mill, a No. 2 rolling mill, a No. 3 rolling mill, a No. 4 rolling mill, a No. 5 rolling mill, a shearing machine and a coiler, all of which are connected to a PLC controller, wherein the No. 1 rolling mill, the No. 2 rolling mill, the No. 3 rolling mill, the No. 4 rolling mill and the No. 5 rolling mill are all provided with a working roll group, a backup roll group, a sensor and an emulsion nozzle, and a thickness gauge is provided at the steel outlet of the No. 5 rolling mill, characterized in that: The specific method is: 1) adjusting the roll spacing between the working roll groups of the No. 1 rolling mill to be greater than the thickness of the pickled plate, adjusting the roll spacing between the working roll groups of the No. 2 rolling mill to be greater than the thickness of the pickled plate, adjusting the roll spacing between the working roll groups of the No. 3 rolling mill to be greater than the thickness of the pickled plate, and adjusting the roll spacing between the working roll groups of the No. 4 rolling mill to be greater than the thickness of the pickled plate; 2) shielding the sensor signals of the No. 1 rolling mill, the No. 2 rolling mill, the No. 3 rolling mill and the No. 4 rolling mill, and shutting down the emulsion nozzles of the No. 1 rolling mill, the No. 2 rolling mill, the No. 3 rolling mill and the No. 4 rolling mill; 3) replacing the working roll set of the No. 5 rolling mill with a roll set with a grinding crown of 0±5 μm; 4) reducing the reduction rate of the working roll group of the No. 5 rolling mill; 5) reducing the liquid discharge rate of the emulsion nozzle of the No. 5 rolling mill; 6) Shielding the thickness measurement signal of the thickness gauge at the outlet of the No. 5 rolling mill.

2. The method for producing pickled steel coils by a five-stand continuous rolling mill according to claim 1, characterized in that: The shearing machine is provided with a thickness tester, and the thickness tester is connected to the PLC control.

3. The method for producing pickled steel coils by a five-stand continuous rolling mill according to claim 2, characterized in that: The coiling speed of the coiler is adjusted to 80m / min.

4. The method for producing pickled steel coils by a five-stand continuous rolling mill according to claim 1 or 3, characterized in that: The roll spacing between the working roll groups of the No. 1 rolling mill is adjusted to 20 mm, the roll spacing between the working roll groups of the No. 2 rolling mill is adjusted to 16 mm, the roll spacing between the working roll groups of the No. 3 rolling mill is adjusted to 12 mm, and the roll spacing between the working roll groups of the No. 4 rolling mill is adjusted to 8 mm.

5. The method for producing pickled steel coils by a five-stand continuous rolling mill according to claim 4, characterized in that: The reduction parameters of the working roll group of the No. 5 rolling mill are set to 2.7mm rolling 1.9mm.

6. The method for producing pickled steel coils by a five-stand continuous rolling mill according to claim 5, characterized in that: The liquid output of the emulsion nozzle of the No. 5 rolling mill is set to 800L / min.

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