CN114178321A - Method for reducing cold rolling force - Google Patents
Method for reducing cold rolling force Download PDFInfo
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- CN114178321A CN114178321A CN202111360250.2A CN202111360250A CN114178321A CN 114178321 A CN114178321 A CN 114178321A CN 202111360250 A CN202111360250 A CN 202111360250A CN 114178321 A CN114178321 A CN 114178321A
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- 238000005097 cold rolling Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 80
- 239000010959 steel Substances 0.000 claims abstract description 80
- 238000005096 rolling process Methods 0.000 claims abstract description 50
- 238000005070 sampling Methods 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 2
- 238000009864 tensile test Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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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
-
- 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
-
- 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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- 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 plate strip cold rolling, and solves the technical problem that the cold rolling actual rolling force influences the cold rolling strip shape quality in the related technology, but the optimal rolling temperature range needs to be searched. The method comprises the following steps: sampling the deformation area, acquiring the strip steels with various preset thicknesses after deformation in the cold rolling process, and sampling the strip steels with various preset thicknesses to obtain samples with various preset thicknesses; and (2) variable-temperature stretching, wherein samples with various preset thicknesses are processed to form tensile samples with various preset thicknesses, the tensile strength of each tensile sample with the preset thickness is measured at various preset temperatures, the tensile strength is measured at various preset temperatures, and the temperature range corresponding to the minimum tensile strength is obtained. 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 plates and strips, in particular to a method for reducing cold rolling force.
Background
The rolling force is one of the important technological parameters in the rolling process and is an important basis for establishing the rolling process, and the distribution of the rolling force directly influences the thickness and the plate shape of the plate strip. There are many factors that affect the 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 c, and in order to obtain good plate shape and reduce rolling force, an optimum rolling temperature range is determined.
Disclosure of Invention
The application provides a method for reducing cold rolling force, which solves the technical problem that the cold rolling actual rolling force influences the cold rolling plate shape quality in the related technology, but the optimal rolling temperature range needs to be searched.
The application provides a method for reducing cold rolling force, which comprises the following steps: sampling the deformation area, acquiring the strip steels with various preset thicknesses after deformation in the cold rolling process, and sampling the strip steels with various preset thicknesses to obtain samples with various preset thicknesses; and (2) variable-temperature stretching, wherein samples with various preset thicknesses are processed to form tensile samples with various preset thicknesses, the tensile strength of each tensile sample with the preset thickness is measured at various preset temperatures, the tensile strength is measured at various preset temperatures, and the temperature range corresponding to the minimum tensile strength is obtained.
Optionally, the deformation zone is sampled to obtain the strip steel with a plurality of preset thicknesses after deformation in the cold rolling process, and the method comprises the following steps:
in the multi-stand cold continuous rolling mill in the cold rolling process, the thickness of strip steel at the inlet of the rolling mill of the first stand and the thickness of strip steel at the outlet of all the stands are taken as a plurality of preset thicknesses.
Optionally, the deformation zone is sampled, acquires the belted steel of multiple preset thickness after warping in cold rolling process, in the belted steel sample of multiple preset thickness in order to obtain the sample of multiple preset thickness, includes:
within the preset range of the cold rolling speed, a rolling mill is stopped by operating a quick stop key;
cutting the strip steel by utilizing the inlet of the rolling mill after the rolling mill is stopped;
after slitting the strip steel, performing a tail flicking operation to coil the strip steel in the rolling mill frame onto a steel coil of a coiling machine;
after the strip steel is coiled on the steel coil of the coiling machine, the steel coil of the coiling machine is unloaded;
and (3) 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, within the preset range of the cold rolling speed, the rolling mill is stopped by a quick stop key, comprising:
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 in the middle of the plate width of the strip steel with various preset thicknesses, and samples with various preset thicknesses of 400 multiplied by 400mm in length and width are sampled.
Optionally, in processing the samples with the multiple preset thicknesses into the tensile test specimens with the multiple preset thicknesses, the tensile test specimens include:
the first end head, the long narrow part and the second end head are connected in sequence, the first end head and the second end head are symmetrically arranged on two sides of the long narrow part in the length direction, and the width of the first end head and the width of the second end head are larger than that of the long narrow part.
Optionally, the length of the long narrow part is 75mm and the width is 12.5 mm.
Optionally, the tensile strength of each tensile specimen of predetermined thickness is measured at a plurality of predetermined temperatures, including:
taking the numerical values of the increasing series sequentially spaced at 20 ℃ in the range from room temperature to 300 ℃ as the numerical values of the plurality of preset temperatures.
Optionally, the plurality of preset temperatures include increasing numerical values sequentially spaced at 20 ℃ in a range from room temperature to 300 ℃, including:
selecting room temperature, 40 ℃, 60 ℃, 80 ℃, 100 ℃, 120 ℃, 140 ℃, 160 ℃, 180 ℃, 200 ℃, 220 ℃, 240 ℃, 260 ℃, 280 ℃ and 300 ℃ as preset temperatures, wherein the number of the tensile samples with each preset thickness is consistent with the number of the preset temperatures.
Optionally, the measuring the tensile strength at a plurality of preset temperatures to obtain the temperature range corresponding to the minimum tensile strength includes:
and drawing corresponding tensile strength graphs at various preset temperatures aiming at different preset thickness samples so as to obtain a temperature range corresponding to the minimum tensile strength.
The beneficial effect of this application is as follows: the application provides a method for reducing cold rolling force, through the thickness change of strip steel in a simulated cold rolling process, the strip steel with multiple preset thicknesses is selected, then samples with multiple preset thicknesses are obtained, temperature-changing stretching is carried out subsequently, the samples are made into tensile samples, the tensile strength is measured at multiple preset temperatures, the number of corresponding tensile samples with each preset thickness is not less than the number of preset temperatures to be measured, so that a tensile strength curve changing 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 rolling strip steel is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
FIG. 1 is a flow chart of a method of reducing cold rolling force provided herein;
FIG. 2 is a schematic structural diagram of a tensile specimen in a method for reducing cold rolling force provided by the present application;
fig. 3 is a graph of tensile strength provided herein.
The attached drawings are marked as follows: 100-tensile specimen, 110-first end, 120-long narrow, 130-second end.
Detailed Description
The embodiment of the application solves the technical problem that the cold rolling actual rolling force influences the cold rolled plate shape quality in the related technology but the optimal rolling temperature range needs to be searched by providing the method for reducing the cold rolling force.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a method of reducing cold rolling force comprising: sampling the deformation area, acquiring the strip steels with various preset thicknesses after deformation in the cold rolling process, and sampling the strip steels with various preset thicknesses to obtain samples with various preset thicknesses; and (2) variable-temperature stretching, wherein samples with various preset thicknesses are processed to form tensile samples with various preset thicknesses, the tensile strength of each tensile sample with the preset thickness is measured at various preset temperatures, the tensile strength is measured at various preset temperatures, and the temperature range corresponding to the minimum tensile strength is obtained.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1
Referring to fig. 1 and 3, the present embodiment discloses a method for reducing cold rolling force, including: sampling the deformation area, acquiring the strip steels with various preset thicknesses after deformation in the cold rolling process, and sampling the strip steels with various preset thicknesses to obtain samples with various preset thicknesses; and (2) variable-temperature stretching, wherein samples with various preset thicknesses are processed to form tensile samples with various preset thicknesses, the tensile strength of each tensile sample with the preset thickness is measured at various preset temperatures, the tensile strength is measured at various preset temperatures, and the temperature range corresponding to the minimum tensile strength is obtained.
Specifically, the thickness change of the strip steel in the simulated cold rolling process is adopted, the strip steel with various preset thicknesses is selected, samples with various preset thicknesses are further obtained, variable temperature stretching is subsequently carried out, the samples are made into tensile samples, the tensile strength is measured at various 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, so that a tensile strength curve changing 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 by 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 above-mentioned minimum tensile strength is not limited to the minimum value of the measured tensile strength curve, but generally refers to the minimum tensile strength in an interval range, and as shown in fig. 3, the tensile strength corresponding to the curve after 120 ℃ on the abscissa is in the above-mentioned minimum tensile strength range.
Optionally, the sampling of the deformation region is performed to obtain the strip steels with a plurality of preset thicknesses after deformation in the cold rolling process, and the method includes taking 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 the stands in a multi-stand cold continuous rolling mill of the cold rolling process as the plurality of preset thicknesses. Therefore, the samples with the preset thicknesses are subjected to variable-temperature stretching to obtain the temperature ranges corresponding to the respective minimum tensile strengths, and the working temperature ranges of the frames are favorably regulated.
Optionally, the sampling in the deformation region is performed to obtain various kinds of strip steel with preset thicknesses after deformation in the cold rolling process, and the sampling is performed on the various kinds of strip steel with preset thicknesses to obtain various kinds of samples with preset thicknesses, as shown in fig. 1, the sampling includes:
the rolling mill shown in fig. 1 is stopped, and specifically, within a preset range of the cold rolling speed, the rolling mill is stopped by operating a quick stop key;
the mill shown in fig. 1 cuts the strip at the inlet thereof, and specifically cuts the strip at the inlet thereof after the mill is stopped;
the tail flick operation shown in fig. 1 is performed, specifically, after slitting the strip steel, the tail flick operation is performed to wind the strip steel coil in the rolling mill housing onto the steel coil of the coiler;
the coil stripping shown in fig. 1, specifically, after the strip steel is coiled on the steel coil of the coiler, the steel coil of the coiler is stripped;
the off-line inspection and sampling shown in fig. 1 includes taking out deformed strip steels with various preset thicknesses from the strip steels on the steel coil of the coiler by using an off-line uncoiler, and sampling the strip steels with various preset thicknesses to obtain samples with various preset thicknesses.
Through the operation, the deformation area is sampled, the strip steels with various preset thicknesses after deformation in the cold rolling process are obtained, and the step of sampling the strip steels 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-changing tensile test after sampling the deformation region.
Optionally, the above-mentioned operating the rolling mill to stop the rolling mill by using the stop key within the preset range of the cold rolling speed includes: the preset range of the cold rolling speed is controlled within the range of 150-300mpm, namely not less than 150mpm and not more than 300mpm, for example, 200mpm can be selected, so as to ensure that the rolling mill does not break the strip.
Optionally, the sampling of the strip steel with multiple preset thicknesses to obtain samples with multiple preset thicknesses includes: sampling the middle parts of the widths of the strip steels with various preset thicknesses, sampling the samples with various preset thicknesses of 400 multiplied by 400mm in length and width, and carrying out subsequent variable-temperature stretching according to the samples.
Optionally, the tensile strength of each tensile specimen of predetermined thickness is measured at a plurality of predetermined temperatures, including: taking the numerical values of the increasing series sequentially spaced at 20 ℃ in the range from room temperature to 300 ℃ as the numerical values of the plurality of preset temperatures. The preset temperature of the arithmetic progression is selected as much as possible, so that the change trend of the tensile strength along with the temperature change is displayed.
Optionally, the determining the tensile strength at a plurality of preset temperatures to obtain the temperature range corresponding to the minimum tensile strength includes: and drawing corresponding tensile strength graphs 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 the cold rolling force of example 1, in this example, samples with various preset thicknesses are processed into tensile test specimens with various preset thicknesses, and the tensile test specimens are specifically arranged as shown in fig. 2.
The tensile test sample 100 comprises a first end head 110, a long narrow part 120 and a second end head 130 which are connected in sequence, wherein the first end head 110 and the second end head 130 are symmetrically arranged at two sides of the long narrow part 120 in the length direction, and the width of each of the first end head 110 and the second end head 130 is larger than that of the long narrow part 120. The entire tensile specimen 100 is subjected to a tensile strength measurement at a predetermined temperature by the first end head 110 and the second end head 130 being clamped.
Alternatively, as shown in fig. 2, the long narrow portion 120 has a length of 75mm and a width of 12.5 mm. It should be understood that the two dotted lines in fig. 2 only indicate the dividing line between the narrow portion 120 and the first and second ends 110, 130, and do not mean that the structure itself must be manufactured in segments.
Example 3
Based on the method for reducing cold rolling force of embodiment 1, the present embodiment further selects the preset temperature, including selecting room temperature, 40 ℃, 60 ℃, 80 ℃, 100 ℃, 120 ℃, 140 ℃, 160 ℃, 180 ℃, 200 ℃, 220 ℃, 240 ℃, 260 ℃, 280 ℃ and 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, that is, 15 tensile samples are correspondingly manufactured for each preset thickness. And after the tensile strength is measured, drawing and forming a tensile strength graph as shown in figure 3, and obtaining the temperature range corresponding to the minimum tensile strength of the strip steel with different thicknesses, wherein the temperature range 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 the cold rolling force according to embodiment 1, this embodiment provides a specific manner of selecting the predetermined thickness.
In a five-stand cold continuous rolling mill, the thickness of strip steel at the inlet of a first stand rolling mill is 2.6mm, the thickness of strip steel at the outlet of the first stand is 1.9mm, the thickness of strip steel at the outlet of a second stand is 1.2mm, the thickness of strip steel at the outlet of a third stand is 0.8mm, the thickness of strip steel at the outlet of a fourth stand is 0.6mm, and the thickness of strip steel at the outlet of a fifth stand is 0.5 mm. Six preset thicknesses of 2.6mm, 1.9mm, 1.2mm, 0.8mm, 0.6mm and 0.5mm are selected in total, and sampling with a deformation zone and variable temperature tensile testing are performed correspondingly.
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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method of reducing cold rolling stress, the method comprising:
s1, sampling a deformation area, namely obtaining band steels with various preset thicknesses after deformation in a cold rolling process, and sampling the band steels with various preset thicknesses to obtain samples with various preset thicknesses;
s2, variable-temperature stretching;
s2.1, processing the samples with the multiple preset thicknesses to form tensile samples with multiple preset thicknesses;
s2.2, measuring the tensile strength of each tensile sample with the preset thickness at multiple preset temperatures;
and S2.3, measuring the tensile strength at the multiple preset temperatures to obtain a temperature range corresponding to the minimum tensile strength.
2. The method of claim 1, wherein said deformation zone is sampled to obtain a plurality of predetermined thicknesses of strip steel after deformation in a cold rolling process, comprising:
in the multi-stand cold continuous rolling mill in the cold rolling process, 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 the stands are taken as the preset thicknesses.
3. The method of claim 1, wherein the deformation zone is sampled to obtain a plurality of predetermined thicknesses of the strip steel after being deformed in the cold rolling process, and the sampling of the plurality of predetermined thicknesses of the strip steel to obtain a plurality of predetermined thicknesses of the sample comprises:
s1.1, operating a quick stop key by a rolling mill within a preset range of the cold rolling speed to stop the rolling mill;
s1.2, cutting strip steel by using an inlet of a rolling mill after the rolling mill is stopped;
s1.3, after the strip steel is cut, tail flicking operation is carried out, and the strip steel coil in the rolling mill frame is placed on a steel coil of a coiling machine;
s1.4, after the strip steel is coiled on a steel coil of a coiling machine, the steel coil of the coiling machine is unloaded;
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.
4. The method of claim 3, wherein the rolling mill is stopped by a rolling mill operation stop key within a preset range of cold rolling speed, comprising:
the preset range of the cold rolling speed is controlled within the range of 150-300 mpm.
5. The method of claim 3, wherein sampling the plurality of predetermined thicknesses of strip steel to obtain a plurality of predetermined thicknesses of sample comprises:
and sampling the middle parts of the widths of the strip steels with the various preset thicknesses, and sampling the samples with the lengths and the widths of 400 multiplied by 400mm and the various preset thicknesses.
6. The method of claim 1, wherein said processing said plurality of samples of predetermined thickness into a plurality of tensile specimens of predetermined thickness comprises:
the first end head and the second end head are symmetrically arranged on two sides of the length direction of the long narrow part, and the width of the first end head and the width of the second end head are larger than that of the long narrow part.
7. The method of claim 6, wherein the long narrow portion has a length of 75mm and a width of 12.5 mm.
8. The method of claim 1, wherein said measuring tensile strength of each of said tensile specimens of predetermined thickness at a plurality of predetermined temperatures comprises:
and taking the numerical values of the increasing numbers sequentially spaced at 20 ℃ in the range from room temperature to 300 ℃ as the numerical values of the plurality of preset temperatures.
9. The method of claim 8, wherein the plurality of predetermined temperatures comprises an increasing series of values spaced sequentially 20 ℃ from room temperature to 300 ℃, comprising:
selecting room temperature, 40 ℃, 60 ℃, 80 ℃, 100 ℃, 120 ℃, 140 ℃, 160 ℃, 180 ℃, 200 ℃, 220 ℃, 240 ℃, 260 ℃, 280 ℃ and 300 ℃ as the preset temperatures, wherein the number of the tensile samples with each preset thickness is consistent with the number of the preset temperatures.
10. The method of claim 1, wherein said determining the tensile strength at said plurality of predetermined temperatures to obtain the temperature range corresponding to the minimum tensile strength comprises:
and drawing corresponding tensile strength graphs at the multiple preset temperatures aiming at different preset thickness samples 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 CN114178321B (en) | 2024-05-10 |
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