CN114178321B - Method for reducing cold rolling force - Google Patents
Method for reducing cold rolling force Download PDFInfo
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- CN114178321B CN114178321B CN202111360250.2A CN202111360250A CN114178321B CN 114178321 B CN114178321 B CN 114178321B CN 202111360250 A CN202111360250 A CN 202111360250A CN 114178321 B CN114178321 B CN 114178321B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/12—Rolling load or rolling pressure; roll force
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention discloses a method for reducing cold rolling force, relates to the technical field of metal sheet and strip cold rolling, and solves the technical problem that cold rolling actual rolling force influences cold rolling sheet shape quality in the related art, but an optimal rolling temperature range is required to be searched. The method comprises the following steps: sampling in a deformation area, namely obtaining strip steel with various preset thicknesses after deformation in a cold rolling process, and sampling the strip steel with various preset thicknesses to obtain samples with various preset thicknesses; and (3) variable-temperature stretching, namely processing samples with various preset thicknesses to form tensile samples with various preset thicknesses, measuring the tensile strength of each tensile sample with various preset thicknesses at various preset temperatures, and obtaining a temperature range corresponding to the minimum tensile strength according to the measured tensile strength at various preset temperatures. By determining the optimal rolling temperature range, the actual rolling force in the cold rolling process is reduced, and the plate shape quality of the cold-rolled strip steel is improved.
Description
Technical Field
The invention relates to the technical field of cold rolling of metal sheet strips, in particular to a method for reducing cold rolling force.
Background
The rolling force is one of important technological parameters in the rolling process, and is an important basis for formulating the rolling process, and the distribution of the rolling force directly influences the thickness and the plate shape of the plate and strip. Many factors influence cold rolling force, including material composition, microstructure, roll diameter, reduction, friction, tension, and rolling temperature. The rolling temperature of cold rolling is usually controlled in the range of room temperature to 300 ℃, and in order to obtain a good plate shape and reduce the rolling force, an optimal rolling temperature range is determined.
Disclosure of Invention
The application provides a method for reducing cold rolling force, which solves the technical problem that cold rolling actual rolling force in the related art influences cold rolling plate shape quality, but an optimal rolling temperature range is required to be searched.
The application provides a method for reducing cold rolling force, which comprises the following steps: sampling in a deformation area, namely obtaining strip steel with various preset thicknesses after deformation in a cold rolling process, and sampling the strip steel with various preset thicknesses to obtain samples with various preset thicknesses; and (3) variable-temperature stretching, namely processing samples with various preset thicknesses to form tensile samples with various preset thicknesses, measuring the tensile strength of each tensile sample with various preset thicknesses at various preset temperatures, and obtaining a temperature range corresponding to the minimum tensile strength according to the measured tensile strength at various preset temperatures.
Optionally, sampling the deformation area to obtain strip steel with various preset thicknesses after deformation in the cold rolling process, including:
in a multi-stand cold continuous rolling mill of a cold rolling process, the thickness of the inlet strip steel of the rolling mill of a first stand and the thicknesses of the outlet strip steels of all stands are taken as various preset thicknesses.
Optionally, sampling the deformation area to obtain strip steel with various preset thicknesses after deformation in the cold rolling process, sampling the strip steel with various preset thicknesses to obtain samples with various preset thicknesses, including:
in the preset range of the cold rolling speed, the rolling mill operates a quick stop key to stop the rolling mill;
after the rolling mill is stopped, the strip steel is cut by utilizing the inlet of the rolling mill;
After the strip steel is cut, tail flicking operation is carried out, and the strip steel in the rolling mill frame is coiled on the steel coil of the coiling machine;
After the strip steel coil is arranged on the steel coil of the coiling machine, the steel coil of the coiling machine is dismounted;
and taking the deformed strip steel with various preset thicknesses from the strip steel on the steel coil of the coiling machine by adopting an off-line uncoiler, and sampling the strip steel with various preset thicknesses to obtain samples with various preset thicknesses.
Optionally, in the preset range of the cold rolling speed, the rolling mill operation snap stop key stops the rolling mill, including:
the preset range of the cold rolling speed is controlled within the range of 150-300 mpm.
Optionally, sampling the strip steel with a plurality of preset thicknesses to obtain samples with a plurality of preset thicknesses, including:
Sampling is carried out on the middle part of the plate width of the strip steel with various preset thicknesses, and samples with various preset thicknesses with the length of 400 multiplied by 400mm are sampled.
Optionally, processing the samples with the plurality of preset thicknesses to form a tensile specimen with the plurality of preset thicknesses, wherein the tensile specimen comprises:
the first end, the long narrow portion and the second end that connect gradually, first end and second end symmetry arrange in long narrow portion length direction's both sides, and the width of first end and second end is all greater than long narrow portion's width.
Alternatively, the long narrow portion has a length of 75mm and a width of 12.5mm.
Optionally, measuring the tensile strength of each tensile specimen of a predetermined thickness at a plurality of predetermined temperatures includes:
and taking the numerical values of the incremental series of the sequentially-spaced 20 ℃ at the room temperature to 300 ℃ as the numerical values of various preset temperatures.
Optionally, the plurality of preset temperatures includes increasing numbers ranging from room temperature to 300 ℃ at sequentially spaced intervals of 20 ℃, including:
The room temperature, 40 ℃, 60 ℃, 80 ℃, 100 ℃, 120 ℃, 140 ℃, 160 ℃, 180 ℃, 200 ℃, 220 ℃, 240 ℃, 260 ℃, 280 ℃ and 300 ℃ are selected as preset temperatures, and the number of the tensile samples with each preset thickness is consistent with the number of the preset temperatures.
Optionally, determining the tensile strength according to a plurality of preset temperatures, and obtaining a temperature range corresponding to the minimum tensile strength includes:
Drawing corresponding tensile strength graphs at various preset temperatures for samples with different preset thicknesses so as to obtain a temperature range corresponding to the minimum tensile strength.
The application has the following beneficial effects: the application provides a method for reducing cold rolling force, which comprises the steps of selecting a plurality of strip steels with preset thickness by simulating thickness change of the strip steel in a cold rolling process, further obtaining samples with the preset thickness, carrying out variable-temperature stretching on the samples, preparing tensile samples by the samples, measuring tensile strength at the preset temperatures, and obtaining a tensile strength curve changing along with the temperature by the number of the corresponding tensile samples with each preset thickness not less than the number of the preset temperatures to be measured, thereby determining a temperature range corresponding to the minimum tensile strength, and reducing the actual rolling force in the cold rolling process and improving the plate shape quality of the cold rolling strip steel by determining the optimal rolling temperature range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention.
FIG. 1 is a flow chart of a method for reducing cold rolling force provided by the application;
FIG. 2 is a schematic diagram of a tensile test specimen in a method for reducing cold rolling force according to the present application;
Fig. 3 is a graph of tensile strength provided by the present application.
The drawings are marked: 100-tensile specimen, 110-first end, 120-long narrow portion, 130-second end.
Detailed Description
The embodiment of the application solves the technical problem that the actual cold rolling force influences the quality of the cold-rolled sheet shape in the related technology by providing the method for reducing the cold rolling force, but the optimal rolling temperature range is required to be searched.
The technical scheme in the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
A method of reducing cold rolling force comprising: sampling in a deformation area, namely obtaining strip steel with various preset thicknesses after deformation in a cold rolling process, and sampling the strip steel with various preset thicknesses to obtain samples with various preset thicknesses; and (3) variable-temperature stretching, namely processing samples with various preset thicknesses to form tensile samples with various preset thicknesses, measuring the tensile strength of each tensile sample with various preset thicknesses at various preset temperatures, and obtaining a temperature range corresponding to the minimum tensile strength according to the measured tensile strength at various preset temperatures.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1
Referring to fig. 1 and 3, the present embodiment discloses a method for reducing cold rolling force, which includes: sampling in a deformation area, namely obtaining strip steel with various preset thicknesses after deformation in a cold rolling process, and sampling the strip steel with various preset thicknesses to obtain samples with various preset thicknesses; and (3) variable-temperature stretching, namely processing samples with various preset thicknesses to form tensile samples with various preset thicknesses, measuring the tensile strength of each tensile sample with various preset thicknesses at various preset temperatures, and obtaining a temperature range corresponding to the minimum tensile strength according to the measured tensile strength at various preset temperatures.
Specifically, through simulating the thickness change of the strip steel in the cold rolling process, a plurality of strip steel with preset thicknesses are selected, then samples with the preset thicknesses are obtained, temperature-changing stretching is carried out subsequently, the samples are manufactured into tensile samples, the tensile strength is measured at a plurality of preset temperatures, the number of the corresponding tensile samples with each preset thickness is not less than the number of the preset temperatures to be measured, and accordingly a tensile strength curve which changes along with the temperature is obtained, the temperature range corresponding to the minimum tensile strength is determined, the actual rolling force in the cold rolling process is reduced through determining the optimal rolling temperature range, and the plate shape quality of the cold-rolled strip steel is improved.
It should be understood that the minimum tensile strength is not limited to the minimum value of the measured tensile strength curve, but generally refers to the tensile strength of the minimum range of one interval, and as shown in fig. 3, the tensile strength corresponding to the curve after 120 ℃ on the abscissa is within the minimum tensile strength range.
Optionally, the deformation area is sampled to obtain strip steel with various preset thicknesses after deformation in the cold rolling process, and the thickness of the strip steel at the inlet of the rolling mill of the first stand and the thickness of the strip steel at the outlet of all stands are taken as various preset thicknesses in a multi-stand cold continuous rolling mill in the cold rolling process. And the samples with the preset thicknesses are subjected to variable-temperature stretching to obtain temperature ranges corresponding to the respective minimum tensile strength, so that the working temperature ranges of the frames can be regulated and controlled.
Optionally, the sampling in the deformation area is used to obtain strip steel with various preset thicknesses after deformation in the cold rolling process, and samples with various preset thicknesses are obtained by sampling the strip steel with various preset thicknesses, as shown in fig. 1, including:
the rolling mill shown in fig. 1 is stopped, specifically, the rolling mill is stopped by operating a snap stop key within a preset range of cold rolling speed;
The inlet shear of the rolling mill shown in fig. 1 cuts the strip steel, specifically, after the rolling mill is stopped, the inlet shear of the rolling mill cuts the strip steel;
the tail flick operation shown in fig. 1, specifically, after the strip steel is slit, the tail flick operation is performed to roll the strip steel in the rolling mill frame onto the steel coil of the coiling machine;
the coil unloading shown in fig. 1, specifically, after the coil of strip is applied to the coil of strip of the coiler, the coil of strip of the coiler is unloaded;
the off-line inspection sampling shown in fig. 1 includes taking deformed strips of various preset thicknesses from the strip on the coil of the coiler by using an off-line uncoiler, and sampling the strips of various preset thicknesses to obtain samples of various preset thicknesses.
Through the operation, sampling is carried out in the deformation zone, the strip steel with various preset thicknesses after deformation in the cold rolling process is obtained, and the step of sampling the strip steel with various preset thicknesses to obtain samples with various preset thicknesses is completed.
It should be noted that the off-line inspection sampling shown in fig. 1 also includes a temperature change tensile test after the deformation zone sampling.
Optionally, the rolling mill operation snap stop key stops the rolling mill within the preset range of the cold rolling speed, including: the preset range of cold rolling speed is controlled in the range of 150-300mpm, i.e. not less than 150mpm and not more than 300mpm, for example 200mpm is optional, to ensure continuous strip rolling.
Optionally, the sampling of the strip steel with various preset thicknesses to obtain samples with various preset thicknesses includes: sampling the middle part of the plate width of the strip steel with various preset thicknesses, sampling samples with various preset thicknesses with the length of 400 multiplied by 400mm, and carrying out subsequent variable-temperature stretching according to the samples.
Optionally, measuring the tensile strength of each tensile specimen of a predetermined thickness at a plurality of predetermined temperatures includes: and taking the numerical values of the incremental series of the sequentially-spaced 20 ℃ at the room temperature to 300 ℃ as the numerical values of various preset temperatures. The preset temperature of the arithmetic series is selected as much as possible, so that the change trend of the tensile strength along with the temperature change is displayed.
Optionally, the measuring the tensile strength according to a plurality of preset temperatures to obtain a temperature range corresponding to the minimum tensile strength includes: drawing corresponding tensile strength diagrams at various preset temperatures for samples with different preset thicknesses, as shown in fig. 3, so as to obtain a temperature range corresponding to the minimum tensile strength. Thereby being beneficial to determining the optimal rolling temperature range, further reducing the actual rolling force in the cold rolling process and improving the plate shape quality of the cold-rolled strip steel.
Example 2
Based on the method for reducing cold rolling force of example 1, in this example, samples with various preset thicknesses are processed to form tensile samples with various preset thicknesses, and as shown in fig. 2, the tensile samples are specifically set.
The tensile specimen 100 includes a first end 110, a long narrow portion 120 and a second end 130 connected in sequence, the first end 110 and the second end 130 are symmetrically arranged at two sides of the long narrow portion 120 in the length direction, and the widths of the first end 110 and the second end 130 are larger than the width of the long narrow portion 120. The tensile strength measurement is performed with the first end 110 and the second end 130 clamped, and the entire tensile specimen 100 is at a predetermined temperature.
Alternatively, as shown in FIG. 2, the long narrow portion 120 has a length of 75mm and a width of 12.5mm. It should be noted that the two dotted lines in fig. 2 are only used to indicate the boundary between the long and narrow portion 120 and the first and second ends 110 and 130, and do not include the meaning that the structure itself must be manufactured in sections.
Example 3
In the method for reducing cold rolling force based on embodiment 1, the further selection of the preset temperature in this embodiment includes selecting room temperature, 40 ℃, 60 ℃, 80 ℃,100 ℃, 120 ℃, 140 ℃, 160 ℃, 180 ℃,200 ℃, 220 ℃, 240 ℃, 260 ℃, 280 ℃, 300 ℃ as the preset temperature, and the number of the tensile samples of each preset thickness is consistent with the number of the preset temperature, namely, 15 tensile samples are correspondingly manufactured for each preset thickness. And drawing a tensile strength diagram shown in fig. 3 after the tensile strength is measured, wherein the temperature range corresponding to the minimum tensile strength of the strip steel with different thickness is more than or equal to 120 ℃, so that the optimal rolling temperature range is obtained, and the corresponding rolling force is the lowest.
Example 4
In the method for reducing cold rolling force based on embodiment 1, this embodiment provides a specific way of selecting the preset thickness.
In a five-frame cold continuous rolling mill, the thickness of the strip steel at the inlet of a first frame rolling mill is 2.6mm, the thickness of the strip steel at the outlet of the first frame is 1.9mm, the thickness of the strip steel at the outlet of the second frame is 1.2mm, the thickness of the strip steel at the outlet of the third frame is 0.8mm, the thickness of the strip steel at the outlet of the fourth frame is 0.6mm, and the thickness of the strip steel at the outlet of the fifth frame is 0.5mm. Six preset thicknesses of 2.6mm, 1.9mm, 1.2mm, 0.8mm, 0.6mm and 0.5mm were selected in total, and the sampling of the deformed region and the temperature change tensile test were performed accordingly.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. A method of reducing cold rolling force, the method comprising:
s1, sampling in a deformation area, obtaining strip steel with various preset thicknesses after deformation in a cold rolling process, in a multi-frame cold continuous rolling mill in the cold rolling process, taking the thickness of the strip steel at the inlet of a rolling mill of a first frame and the thicknesses of strip steel at the outlets of all frames as the various preset thicknesses, and sampling the strip steel with the various preset thicknesses to obtain samples with various preset thicknesses;
s2, variable-temperature stretching;
s2.1, processing the samples with the various preset thicknesses to form tensile samples with various preset thicknesses;
s2.2, measuring the tensile strength of each tensile sample with the preset thickness at a plurality of preset temperatures;
s2.3, measuring the tensile strength according to the various preset temperatures, acquiring a temperature range corresponding to the minimum tensile strength, and regulating and controlling the working temperature range of each rack in the multi-rack cold tandem mill according to the temperature ranges corresponding to the minimum tensile strength obtained by the various samples with preset thickness.
2. The method of claim 1, wherein the sampling of the deformation zone to obtain a plurality of pre-set thickness strips after deformation in the cold rolling process, sampling the plurality of pre-set thickness strips to obtain a plurality of pre-set thickness samples, comprises:
s1.1, in a preset range of cold rolling speed, a rolling mill operation slap quick stop key enables the rolling mill to stop;
S1.2, after the rolling mill is stopped, cutting strip steel by utilizing a rolling mill inlet;
S1.3, after the strip steel is cut, tail flicking operation is carried out, and the strip steel in the rolling mill frame is coiled on a coil of a coiling machine;
s1.4, after the strip steel coil is arranged on a steel coil of a coiling machine, unloading the steel coil of the coiling machine;
S1.5, taking the deformed strip steel with various preset thicknesses from the strip steel on the steel coil of the coiling machine by adopting an off-line uncoiler, and sampling the strip steel with various preset thicknesses to obtain samples with various preset thicknesses.
3. The method of claim 2, wherein the rolling mill operating the snap stop key to stop the rolling mill within a preset range of cold rolling speeds comprises:
The preset range of the cold rolling speed is controlled within the range of 150-300 mpm.
4. The method of claim 2, wherein said sampling the strip of the plurality of predetermined thicknesses to obtain samples of the plurality of predetermined thicknesses comprises:
Sampling the middle part of the plate width of the strip steel with various preset thicknesses, and sampling the samples with various preset thicknesses, the length and the width of which are 400mm and 400 mm.
5. The method of claim 1, wherein said processing said plurality of samples of predetermined thickness to form a plurality of tensile test samples of predetermined thickness, said tensile test samples comprising:
The first end, long narrow portion and the second end that connect gradually, first end with the second end symmetry arrange in long narrow portion length direction's both sides, first end with the width of second end is all greater than long narrow portion's width.
6. The method of claim 5, wherein the long narrow portion has a length of 75mm and a width of 12.5mm.
7. The method of claim 1, wherein said measuring the tensile strength of each of said predetermined thickness tensile test samples at a plurality of predetermined temperatures comprises:
And taking the incremental numerical values sequentially spaced by 20 ℃ in the range of room temperature to 300 ℃ as the numerical values of the plurality of preset temperatures.
8. The method of claim 7, wherein the plurality of predetermined temperatures comprises increasing series of values at 20 ℃ intervals in sequence over a range of room temperature to 300 ℃, comprising:
The room temperature, 40 ℃, 60 ℃, 80 ℃, 100 ℃, 120 ℃, 140 ℃, 160 ℃, 180 ℃, 200 ℃, 220 ℃, 240 ℃, 260 ℃, 280 ℃ and 300 ℃ are selected as the preset temperature, and the number of the tensile samples with the preset thickness is consistent with the number of the preset temperature.
9. The method of claim 1, wherein determining the tensile strength based on the plurality of predetermined temperatures to obtain a temperature range corresponding to a minimum tensile strength comprises:
drawing corresponding tensile strength graphs at the various preset temperatures for samples with different preset thicknesses so as to obtain a temperature range corresponding to the minimum tensile strength.
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| CN202111360250.2A CN114178321B (en) | 2021-11-17 | 2021-11-17 | Method for reducing cold rolling force |
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| CN202111360250.2A CN114178321B (en) | 2021-11-17 | 2021-11-17 | Method for reducing cold rolling force |
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| CN114178321B true CN114178321B (en) | 2024-05-10 |
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