CN109365546B - Production method for controlling aluminum alloy hot rolling gradient finish rolling temperature - Google Patents
Production method for controlling aluminum alloy hot rolling gradient finish rolling temperature Download PDFInfo
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- CN109365546B CN109365546B CN201811264551.3A CN201811264551A CN109365546B CN 109365546 B CN109365546 B CN 109365546B CN 201811264551 A CN201811264551 A CN 201811264551A CN 109365546 B CN109365546 B CN 109365546B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000005098 hot rolling Methods 0.000 title claims abstract description 15
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 abstract description 9
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 150000002739 metals Chemical class 0.000 abstract description 2
- 239000011229 interlayer Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
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Classifications
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
-
- 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
- B21B2261/21—Temperature profile
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention belongs to the technical field of nonferrous metals, and particularly relates to a production method for controlling the hot rolling gradient finish rolling temperature of an aluminum alloy. The finishing temperature of the strip in different length stages is set, so that the finishing temperature is controlled differently in the same coil. According to the specific gradient temperature change slope, different means for controlling the finish rolling temperature are achieved. The hot-rolled coil produced according to the invention has good finished product performance and good surface quality, and avoids the quality abnormity phenomena such as adhesion, thickness difference and the like caused by uneven cooling in the cooling process of a hot-rolled coil.
Description
Technical Field
The invention belongs to the technical field of nonferrous metals, and particularly relates to a production method for controlling the hot rolling gradient finish rolling temperature of an aluminum alloy.
Background
Because of the characteristics of high efficiency, high speed, low cost and the like of aluminum alloy hot rolling production, the processing technology of modern aluminum alloy plate strips generally adopts ingot casting, heating, hot rolling, cold rolling, heat treatment and finishing technology, wherein, in the hot rolling production stage, particularly when the last frame of hot finish rolling is produced, a certain temperature needs to be controlled, the temperature of a hot rolled coil is controlled to ensure that certain required mechanical property is obtained, the requirement of product quality and performance is met, the temperature is generally called as final rolling temperature, the temperature of the hot rolled final rolling is generally controlled to be a fixed value to ensure the mechanical property, and the control value of the final rolling temperature is generally 200 ~ 400 ℃.
According to the above-mentioned finish rolling temperature control means, the finish rolling temperature of the hot rolled coil is fixed during the rolling process, but changes in the actual finish rolling temperature due to the influence of environmental factors during the cooling process are ignored. In the process of storing and cooling the hot rolled coil, the outer ring of the coiled material is cooled quickly, and the middle part and the inner ring of the coiled material are cooled slowly, so that the inner ring and the outer ring of the coiled material are inconsistent at the actual temperature. The inner and outer ring temperature is inconsistent, interlayer gaps are easy to appear, interlayer scratches, namely the defect of 'sticky damage' are generated in the cold rolling and cogging process, the outer ring temperature is low in severe cases, the strength is high, and the phenomenon of uneven performance of the inner and outer rings of the coiled material in the same coiled material is caused.
Since the hot rolled coil is generally used in cold rolling production, and the coil temperature of the hot rolled coil is changed after subsequent finishing treatment, the performance of the finished product is not greatly affected, and the generated scratches can be gradually covered in subsequent processing, the problem is generally ignored. When the hot-rolled coil is directly used for subsequent finished products, the change of the performance can cause that the product cannot be used, the yield is reduced, the defect of coil sticking is generated, and the complaint of customers are easily caused.
Disclosure of Invention
The invention aims to provide a method for producing a hot-rolled coil which not only meets the requirement of mechanical property, but also ensures that the surface is not damaged by adhesion caused by interlayer gaps and has gradient finish rolling temperature control aiming at the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production method for controlling the hot rolling gradient finish rolling temperature of an aluminum alloy is characterized in that when the finish rolling temperature of the last frame of hot finish rolling is controlled, a control means of changing the finish rolling temperature is adopted, different finish rolling temperatures are finally realized on the same coiled material, the uniformity of the whole temperature of a strip can be ensured in the subsequent cooling process, and therefore interlayer adhesion and uneven mechanical properties caused by the difference of the temperatures of an inner ring and an outer ring are avoided.
The method specifically comprises the following steps:
(1) controlling the finish rolling temperature at the value A in the initial rolling stage;
(2) after the strip is rolled to a certain length L, the final rolling temperature changes with a certain slope K, K = v (B-A)/(K pi D), v is the rolling speed of the last stand at the position L, D is the roller diameter of the roller of the last stand, K is a natural number, when v is more than or equal to 3.0m/s, K is 2, when v is less than 3.0m/s, K is 1, K ranges from-30 ~ 30 ℃/s to-30 ~ ℃/s, so that the control value of the final rolling temperature is adjusted to be a B value, the B value is different from the A value, and the absolute difference value of the B and the A is within 30 ℃;
(3) and after the finishing temperature is adjusted to the value B, controlling production by taking the value B as the finishing temperature.
In order to meet the requirement of product performance, in the finish rolling temperature control of the step 1), the finish rolling temperature A value is the normal process requirement, and the specific mechanical property and the product state are achieved.
In order to ensure the stability of the rolling process, the rolling length L value in the step 2) must be selected when the rolling process is carried out to a certain stage, and the selection principle of the L value is to ensure that the rolling process is already in a stable rolling stage and then to select the L value according to the control requirement of the actual rolling temperature, and meanwhile, in order to avoid sudden speed change in the rolling process and sudden changes of plate shape, thickness difference, rolling force and convexity, when the slope K in the step 2) is set, the range of the K is controlled to be ~ 30 ℃ below 30 ℃.
In order to ensure the surface quality and the mechanical property of the outer ring, in the control of the B value in the step 2), the B value is ensured to be different from the A value, and the difference between the B value and the A value is not more than 30 ℃.
The invention is different from the control method of the finish rolling temperature of the common aluminum alloy hot rolled strip, and the innovation points of the invention are as follows:
controlling finish rolling temperature gradient: the production in the same coil is realized at different finishing rolling temperatures.
Reasonably controlling the starting point of the gradient finish rolling temperature control: the stability of the rolling process is ensured by selecting a reasonable starting point L.
Setting a slope K value: by setting the K value, the rolling continuity is ensured, and the continuity and rapidity of the change of the finish rolling temperature are ensured in the process of controlling the change of the finish rolling temperature, so that the stability of the rolling process and the uniformity of the performance of the rolled strip are ensured.
Setting the finishing temperature B: the stability of the strip is ensured by adopting the difference with the initial set finishing temperature A value and ensuring the difference within the range of 30 ℃.
Only according to the control means and relevant parameters of the invention, hot rolled strips with different finish rolling temperature control can be obtained, and the defects of non-uniform mechanical property and interlayer adhesion damage caused by the difference of the inner and outer ring temperatures in the strip cooling process are avoided.
The invention has the beneficial effects that:
a production method for controlling the hot rolling gradient finish rolling temperature of an aluminum alloy is characterized in that when the finish rolling temperature of the last frame of hot finish rolling is controlled, a control means of changing the finish rolling temperature is adopted, different finish rolling temperatures are finally realized on the same coiled material, the uniformity of the whole temperature of a strip can be ensured in the subsequent cooling process, and therefore interlayer adhesion and uneven mechanical properties caused by the difference of the temperatures of an inner ring and an outer ring are avoided. Thereby providing a hot rolled coil production method which not only meets the requirement of mechanical property, but also ensures that the surface is not damaged by adhesion caused by interlayer gaps and has gradient finish rolling temperature control.
Drawings
FIG. 1 is a schematic diagram of final temperature gradient control.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples.
Example 1
The production method of the 5052 aluminum alloy in a hot rolling state at the finish rolling temperature of 320 ℃ on a 1+3 hot rolling mill is characterized in that the gradient finish rolling temperature is controlled in a rolling process that the roll diameter of a final frame F3 is 750mm, the production thickness is 4.5mm, the width is 1450mm, and the total length of a strip is 1200m as follows:
1) controlling the finish rolling temperature at 320 ℃ in the initial stage of rolling;
2) after the strip is rolled to a certain length of 1000m, the rolling speed of F3 at the position is 3.2m/s, K is 2, the B value is 340 ℃, the finishing temperature changes with a certain slope K, and K = v (B-A)/(K pi D) =13.59 ℃/s. Namely, the finishing temperature control was adjusted from 320 ℃ to 340 ℃ with a slope of 13.59 ℃/s.
3) And when the finishing temperature is adjusted to 340 ℃, controlling the production by taking 340 ℃ as the finishing temperature.
The temperature of the outer ring of the 5052 aluminum alloy hot rolled strip manufactured by the embodiment is 340 ℃, the temperature of the inner ring and the temperature of the middle part of the hot rolled strip are 320 ℃, in the cooling process of the strip, although the cooling speed of the outer ring is high, the initial temperature of the outer ring is high, and finally, in the whole temperature reduction process, the temperature difference between the inner ring and the outer ring is reduced, so that the uniformity of the mechanical properties of the inner ring and the outer ring is improved, the interlayer adhesion damage of the outer ring is reduced, and the effect of controlling the final rolling temperature gradient is achieved. The inner and outer races have the following practical properties:
Claims (2)
1. a production method for controlling the hot rolling gradient finish rolling temperature of an aluminum alloy is characterized by comprising the following steps: in the hot rolling production process of the aluminum alloy, along with the rolling process, within a specific length range, the finish rolling temperature changes according to a certain slope, so that the finish rolling temperature is adjusted from a certain value to another value, and the finish rolling temperature realizes gradient change on the same roll; the method specifically comprises the following steps:
1) controlling the finish rolling temperature at A value in the initial rolling stage of hot rolling;
2) after the strip is rolled to a certain length L, the final rolling temperature changes with a certain slope K, K = v (B-A)/(K pi D), v is the rolling speed of the last stand at the position L, D is the roller diameter of the roller of the last stand, K is a natural number, when v is more than or equal to 3.0m/s, K is 2, when v is less than 3.0m/s, K is 1, K ranges from-30 ~ 30 ℃/s to make the control value of the final rolling temperature adjusted to the value B;
3) after the finishing temperature is adjusted to the value B, controlling production by taking the value B as the finishing temperature;
the range of A is 240 ~ 400 deg.C, the range of B is 240 ~ 400 deg.C, B is different from A, and the absolute difference between B and A is within 30 deg.C.
2. The aluminum alloy hot rolling gradient finish rolling temperature controlled production method according to claim 1, characterized in that: the value of the rolling length L in the step 2) is required to be selected when the rolling process is carried out to a certain stage according to the following selection principle: ensuring that the rolling process is already in a stable rolling stage and selecting the rolling process according to the actual rolling temperature control requirement.
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| JPS5922604B2 (en) * | 1979-06-29 | 1984-05-28 | 新日本製鐵株式会社 | Finishing temperature predictive control rolling method for hot strips |
| JP3801017B2 (en) * | 2001-10-31 | 2006-07-26 | 三菱アルミニウム株式会社 | Method for producing high-strength aluminum alloy brazing sheet for heat exchangers with excellent brazeability, formability and erosion resistance |
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Application publication date: 20190222 Assignee: ZHONGLV SOUTHEAST MATERIAL INSTITUTE (FUJIAN) TECHNOLOGY CO.,LTD. Assignor: CHALCO RUIMIN Co.,Ltd. Contract record no.: X2023350000441 Denomination of invention: A Production Method for Temperature Control of Gradient Final Rolling of Aluminum Alloy Hot Rolling Granted publication date: 20200103 License type: Common License Record date: 20231205 |