CN117634147A - Method for selecting gradient of cold rolling rising and reducing of aluminum coiled material - Google Patents

Method for selecting gradient of cold rolling rising and reducing of aluminum coiled material Download PDF

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Publication number
CN117634147A
CN117634147A CN202311457893.8A CN202311457893A CN117634147A CN 117634147 A CN117634147 A CN 117634147A CN 202311457893 A CN202311457893 A CN 202311457893A CN 117634147 A CN117634147 A CN 117634147A
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China
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gradient
cold rolling
thickness
aluminum
coiled material
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CN202311457893.8A
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Chinese (zh)
Inventor
谢汉松
严哲江
邱龙涛
陈聪
陈加龙
陈志良
陈忠成
杨萍
阳伟雄
罗文明
徐宝林
刘荣辉
李智阳
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Chinalco Ruimin Co Ltd
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Chinalco Ruimin Co Ltd
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Priority to CN202311457893.8A priority Critical patent/CN117634147A/en
Publication of CN117634147A publication Critical patent/CN117634147A/en
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Abstract

The invention relates to a method for selecting a gradient of cold rolling rising and subtracting of an aluminum coiled material, which is characterized by comprising the following steps of: (1) When the thickness difference precision of the aluminum coiled material is required to be more than +/-2% of the thickness of a finished product, the gradient of cold rolling rising and subtracting of the aluminum coiled material is selected to be 0.5m/S 2 The method comprises the steps of carrying out a first treatment on the surface of the (2) When the thickness difference precision of the aluminum coiled material is required to be within +/-2% of the thickness of a finished product, the gradient of cold rolling rising and reducing of the aluminum coiled material is selected to be 0.15m/S 2 The method comprises the steps of carrying out a first treatment on the surface of the The method for selecting the gradient of cold rolling rise and fall of the aluminum coiled material is reasonable in design, and is beneficial to improving the yield on the premise of ensuring the production efficiency of cold rolling of the aluminum coiled material.

Description

Method for selecting gradient of cold rolling rising and reducing of aluminum coiled material
Technical field:
the invention relates to a method for selecting a gradient of cold rolling rising and subtracting of an aluminum coiled material.
The background technology is as follows:
the gradient of the cold rolling speed increasing and decreasing is directly influenced by the production efficiency, the time for increasing the gradient to a specified speed is shorter, the time for decreasing the tail part is shorter, the improvement of the production efficiency is more beneficial, but the gradient is higher, the thickness difference fluctuation in the speed increasing and decreasing stage is larger, the thickness difference exceeding the thickness tolerance requirement is easily caused for coiled materials with high thickness difference requirement precision, the thickness difference exceeding standard is caused, and at the moment, the head end and the tail end of the coiled materials are required to be cut in a large amount, so that the yield is influenced.
It is therefore important how to select the gradient of cold rolling increase and decrease for coils with different thickness differences.
At present, the Chinese patent 'a composite aluminum plate manufacturing process' is searched, and publication number CN108188179B comprises the following steps: respectively casting an aluminum-manganese alloy cast ingot and an aluminum-silicon alloy cast ingot in an environment with a casting temperature of 685-700 ℃; preheating an aluminum-manganese alloy cast ingot to 540-560 ℃ in a heating furnace and preserving heat; milling the surface of the aluminum-manganese alloy cast ingot subjected to heat treatment; rolling the aluminum-silicon alloy cast ingot into an aluminum-silicon alloy plate with the thickness of 50 mm-80 mm, and binding the aluminum-silicon alloy plate and the aluminum-manganese alloy cast ingot together; preserving heat in an environment with the temperature of 450-500 ℃ after binding, wherein the heat preservation time is less than or equal to 4 hours; after heat preservation, hot rolling the aluminum coiled material into an aluminum coiled material with the thickness of 5-10 mm; cold rolling the aluminum coil to a predetermined thickness and completely recrystallization annealing at a temperature of 400 ℃ ± 5 ℃; cold rolling to the thickness of a finished product, wherein the invention can reduce the primary phase of large-particle silicon in an aluminum-silicon alloy composite layer; the pretreated cast ingot before hot rolling reduces the precipitation proportion of grain boundary structures and microscopic particles, and can prevent the penetration and corrosion of silicon during vacuum brazing; but it cannot solve the contradiction between cold rolling production efficiency and yield.
The invention comprises the following steps:
in view of the above problems, the invention aims to provide a method for selecting the gradient of cold rolling rising and reducing of an aluminum coiled material, which is reasonable in design and beneficial to improving the yield on the premise of ensuring the production efficiency of cold rolling of the aluminum coiled material.
The invention is realized by adopting the following scheme,
the invention relates to a method for selecting a cold rolling gradient of an aluminum coiled material, which is characterized by comprising the following steps of:
(1) When the thickness difference precision of the aluminum coiled material is required to be more than +/-2% of the thickness of a finished product, the gradient of cold rolling rising and subtracting of the aluminum coiled material is selected to be 0.5m/S 2
(2) When the thickness difference precision of the aluminum coiled material is required to be within +/-2% of the thickness of a finished product, the gradient of cold rolling rising and reducing of the aluminum coiled material is selected to be 0.15m/S 2
In the case of GT product, the thickness tolerance of the product is required to be more than +/-2%, and the gradient of cold rolling rising and reducing of the aluminum coiled material is selected to be 0.5m/S 2 One pass (thickness from 2.1 to 1.0 mm), production speed 550 m/min, rise/fall time 22.91 seconds; two passes (thickness from 1.0mm to 0.5 mm), production speed 800m/min, rise/fall time 33.33 seconds; three passes (thickness from 0.5 to 0.25 mm), production speed 920m/min, ramp up/down time 33.33 seconds.
When the thickness tolerance of the GT product is required to be within +/-2 percent, the gradient of cold rolling rising and decreasing of the aluminum coiled material is selected to be 0.15m/S 2 One pass (thickness from 2.1 to 1.0mm), production speed 550 m/min, rise/fall time 122.22 seconds; two passes (thickness from 1.0mm to 0.5 mm), production speed 800m/min, rise/fall time 177.77 seconds; three passes (thickness from 0.5 to 0.25 mm), production speed 920m/min, ramp up/down time 222.22 seconds.
For different thickness difference precision requirements or different hardness of aluminum coiled materials, different speed gradients are selected to build a model, and during production, the model is directly applied, and the built model is shown in the following table:
product name Production pass Gradient selection (m/S) 2
GT 1 0.5
GT 2 0.5
GT 3 0.15
CTP 1 0.5
CTP 2 0.5
CTP 3 0.15
CTP 4 0.5
GL 1 0.5
GL 2 0.5
GL 3 0.5
GL 4 0.15
GL 5 0.15
Wherein CTP is aluminum for printing plate base, GL is cover material;
according to the table, the gradient of the table model stored in the system is automatically selected and matched according to the input product name (GT, CTP or GL) and the pass number (1, 2, 3, 4 or 5) during production.
The method for selecting the gradient of cold rolling rise and fall of the aluminum coiled material is reasonable in design, and is beneficial to improving the yield on the premise of ensuring the production efficiency of cold rolling of the aluminum coiled material.
Description of the drawings:
the invention is further described below with reference to the accompanying drawings;
FIG. 1 is a simplified working diagram of an embodiment of the present invention;
fig. 2 is a drawing of a belt's lift-off defect.
The specific embodiment is as follows:
the invention is further described below with reference to the drawings and the detailed description.
The invention relates to a method for selecting the gradient of cold rolling rising and reducing of aluminum coiled materials,
1) When the thickness difference precision of the aluminum coiled material is required to be more than +/-2% of the thickness of a finished product, the gradient of cold rolling rising and subtracting of the aluminum coiled material is selected to be 0.5m/S 2
2) When the thickness difference precision of the aluminum coiled material is required to be within +/-2% of the thickness of a finished product, the gradient of cold rolling rising and reducing of the aluminum coiled material is selected to be 0.15m/S 2
For example, the thickness of the finished product is 0.5mm, the tolerance is +/-10 mu m, that is, the tolerance requirement is low, and the gradient is 0.5m/S 2 The method comprises the steps of carrying out a first treatment on the surface of the The tolerance range is within +/-2% of the thickness of the finished product, and the absolute value tolerance is within +/-6 mu m, namely the tolerance requirement is lower.
Taking GT product (namely "can" product) as an example, when the thickness of the finished product is required to be more than +/-2%, the gradient of cold rolling rising and reducing of the aluminum coiled material is selected to be 0.5m/S 2 One pass (thickness from 2.1 to 1.0 mm), production speed 550 m/min, rise/fall time 22.91 seconds; two passes (thickness from 1.0mm to 0.5 mm), production speed 800m/min, rise/fall time 33.33 seconds; three passes (thickness from 0.5 to 0.25 mm), production speed 920m/min, rise/fall time 33.33 seconds;
taking GT product (namely "can" product) as an example, when the thickness of the finished product is within +/-2%, the gradient of cold rolling rising and reducing of the aluminum coiled material is selected to be 0.15m/S 2 One pass (thickness from 2.1 to 1.0 mm), production speed 550 m/min, rise/fall time 122.22 seconds; two passes (thickness from 1.0mm to 0.5 mm), production speed 800m/min, and speed up/down time 177.77 seconds; three passes (thickness from 0.5 to 0.25 mm), production speed 920m/min, ramp up/down time 222.22 seconds;
the details are given in the following table.
Pass of Production speed (m/min) Gradient selection (m/S) 2 Head-tail thickness difference (mum) Time of rise and fall (S) Gradient selection (m/S) 2 Head-tail thickness difference (mum) Time of rise and fall (S)
One pass (2.1-1.0 mm) 550 0.5 15 22.91 0.15 10 122.22
Two pass (1.0-0.5 mm) 800 0.5 9 33.33 0.15 6 177.77
Three pass (0.5-0.25 mm) 920 0.5 5 41.66 0.15 2 222.22
In addition, different speed gradients can be selected to build models for different thickness difference precision requirements or different hardness of aluminum coiled materials, and the models are directly applied in production, so that the built models are shown in the following table:
product name Production pass Gradient selection (m/S) 2
GT 1 0.5
GT 2 0.5
GT 3 0.15
CTP 1 0.5
CTP 2 0.5
CTP 3 0.15
CTP 4 0.5
GL 1 0.5
GL 2 0.5
GL 3 0.5
GL 4 0.15
GL 5 0.15
...... ...... .......
Wherein CTP is aluminum for printing plate base, GL is cover material
According to the table, during production, according to the input product name (GT, CTP or GL) and pass number (1, 2, 3, 4 or 5), the gradient of the table model stored in the system is automatically selected and matched, and the product quality and the efficiency are guaranteed.
The method for selecting the gradient of cold rolling rising and reducing of the aluminum coiled material has the advantages that:
1. the production time of each aluminum coiled material cold rolling comprises the rising speed time of the head part, the stable speed production time and the falling speed time of the tail part, and the rising speed and the falling speed time of the head part and the tail part can be effectively reduced by selecting a larger speed gradient.
2. The reason for the automatic selection of the speed gradient selection: the larger speed gradient, although the efficiency is improved, the stability of the rolling mill can cause a certain problem, the thickness difference is fluctuated, the thickness difference precision of some products is lower, and the larger speed gradient can still be used for ensuring the efficiency; some products have higher thickness difference requirements, and a lower speed gradient is selected in order that the produced strip materials in the head-tail lifting and decelerating stage are not cut and lost; the thickness difference precision of some products is very high, the coiled material produced in the lifting and decelerating stage cannot be used, at the moment, the velocity gradient is selected as large as possible, and the length of the coiled material produced in the lifting and decelerating stage is reduced as much as possible; some products have high work hardening degree, high processing difficulty, and when the speed gradient is large, the plate shape can not be ensured, and the belt is easily broken by throwing. The product specifications are various, so that great difficulty is caused to operators, automatic selection is made by automatic model making, production is stabilized, and operation difficulty is reduced.
In addition, in order to keep stable rolling, a certain tension is added to an inlet and an outlet (tensioning is carried out, deviation is avoided) during production, factors such as uncoiling sticky injury, coiling sticky injury, surface color and the like are considered, according to different product states, the inlet tension and the outlet tension have certain deviation, some product deviations are large, the deviations ensure stable rolling in a steady-speed stage, but the larger front-back tension deviation easily causes slippage of a strip and a working roll at the moment of starting, and the defects directly damage a roller and cause periodic transverse defects of the strip.
In order to overcome the above problems, the present invention also provides a control method of increasing tension according to a rolling state (the control method is performed after selecting an aluminum coil cold rolling gradient); the control method comprises the following specific steps:
s1, respectively setting standard tension values of an uncoiler at an inlet and a coiling machine at an outlet according to process requirements;
s2, after the rolling roll gap is pressed, when the rolling force reaches 2000KN, an operator starts to manually establish tension values of the uncoiler and the coiling machine;
s3, stopping when the established tension value reaches 60% of the tension value set in the step S1 (too small tension cannot fully tighten the strip, and the strip can be thrown off);
s4, rolling mill starting, wherein the rolling mill speed and the in-out tension value are changed in a speed-up stage (about 1.5 seconds) with the starting speed from 0 to 30m/min, and waiting for 3 seconds again until the rolling mill speed and the tension value are stable;
and S5, after the speed and the tension value of the rolling mill are stable, the operator gradually increases the tension of the uncoiler and the coiling machine to the tension value set in S1 according to the gradient of 3KN/S (the tension is too slow, the efficiency is affected, and the strip is easily torn to cause strip breakage too fast).
Wherein in step S1, the tension range of the unwinder is high gear: 3.5-61 KN, low gear: 7.7-134 KN; the tension range of the coiling machine is a high gear: 3.2-52 KN, low gear: 7-115 KN.
In step S2, the direction of stretching the strip by the uncoiler is the direction from the rolling gap to the uncoiler, and the direction of stretching the strip by the coiler is the direction from the rolling gap to the coiler.
Wherein a front guide roller set 3, a rolling roller set 4 and a rear guide roller set 5 are sequentially arranged between the uncoiler 1 and the coiling machine 2 along the conveying direction of the strip 6.
During operation, slipping of the working rolls and the strips is unavoidable, and the purpose of the small tension is to avoid instantaneous forward slipping of the crane, and the strips are pulled towards the outlet instantaneously, so that the strips and the working rolls are mutually staggered and the working rolls are damaged. After the operator builds the tension, only 60% of the set standard tension value is given (too small tension, the strip cannot be tensioned and easily causes deviation rolling leakage, too large tension causes pulling and lifting of the tire defects), after 5 seconds of lifting (after the lifting rolling working roll rotates), the tension is gradually increased according to the gradient of increasing 3KN every 1 second (too slow, the efficiency is influenced and the strip is easily pulled too fast), the tension is increased to the set tension to stop increasing, and the strip breakage caused by the rapid increase of the tension is avoided.
Compared with the prior art, the control method for increasing the tension according to the rolling state has the following beneficial effects:
1. when the established tension value reaches 60% of the tension value set in the step S1, the belt material can be completely tensioned, the deflection of the lifting belt material is avoided, the instant forward sliding of the lifting is avoided, and the lifting pattern defect is avoided.
2. If the tension value is too slow, the efficiency is affected, and the strip is easily pulled too fast, so that the strip is broken, after the speed and the tension value of the rolling mill are stable, an operator gradually increases the tension of the uncoiler and the coiling machine to the tension value set in S1 according to the gradient of 3KN/S, and the high-efficiency stability can be ensured.
3. In the steps S4-S5, the tension can be increased after the working roll rotates after the rolling mill starts to rotate, because the working roll starts to rotate, the tension and the friction force have no speed difference between the strip and the working roll at the moment of starting, the problem of slipping of the strip and the working roll is solved, the tension can be increased, and the tension value required by the strip is ensured.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.

Claims (7)

1. A method for selecting a gradient of cold rolling rising and subtracting of an aluminum coiled material is characterized by comprising the following steps:
when the thickness difference precision of the aluminum coiled material is required to be more than +/-2% of the thickness of a finished product, the gradient of cold rolling rising and subtracting of the aluminum coiled material is selected to be 0.5m/S 2
When the thickness difference precision of the aluminum coiled material is required to be within +/-2% of the thickness of a finished product, the gradient of cold rolling rising and reducing of the aluminum coiled material is selected to be 0.15m/S 2
2. The method for selecting the gradient of cold rolling rising and falling of an aluminum coil according to claim 1, wherein the method comprises the following steps: in the case of GT product, the thickness tolerance of the product is required to be more than +/-2%, and the gradient of cold rolling rising and reducing of the aluminum coiled material is selected to be 0.5m/S 2 One pass (thickness from 2.1 to 1.0 mm), production speed 550 m/min, rise/fall time 22.91 seconds; two passes (thickness from 1.0mm to 0.5 mm), production speed 800m/min, rise/fall time 33.33 seconds; three passes (thickness from 0.5 to 0.25 mm), production speed 920m/min, ramp up/down time 33.33 seconds.
3. The method for selecting the gradient of cold rolling rising and falling of an aluminum coil according to claim 1, wherein the method comprises the following steps: when the thickness tolerance of the GT product is required to be within +/-2 percent, the gradient of cold rolling rising and decreasing of the aluminum coiled material is selected to be 0.15m/S 2 One pass (thickness from 2.1 to 1.0 mm), production speed 550 m/min, rise/fall time 122.22 seconds; two passes (thickness from 1.0mm to 0.5 mm), production speed 800m/min, rise/fall time 177.77 seconds; three passes (thickness from 0.5 to 0.25 mm), production speed 920m/min, ramp up/down time 222.22 seconds.
4. A method for selecting a gradient of cold rolling increase and decrease of an aluminum coil according to claim 2 or 3, wherein: for different thickness difference precision requirements or different hardness of aluminum coiled materials, different speed gradients are selected to build a model, and during production, the model is directly applied, and the built model is shown in the following table:
product name Production pass Gradient selection (m/S) 2 GT 1 0.5 GT 2 0.5 GT 3 0.15 CTP 1 0.5 CTP 2 0.5 CTP 3 0.15 CTP 4 0.5 GL 1 0.5 GL 2 0.5 GL 3 0.5 GL 4 0.15 GL 5 0.15
Wherein CTP is aluminum for printing plate base, GL is cover material;
according to the table, the gradient of the table model stored in the system is automatically selected and matched according to the input product name (GT, CTP or GL) and the pass number (1, 2, 3, 4 or 5) during production.
5. The method for selecting the gradient of cold rolling rising and falling of an aluminum coil according to claim 1, wherein the method comprises the following steps: after the gradient of cold rolling rising and reducing of the aluminum coiled material is selected, the control of tension increase according to the rolling state comprises the following specific steps:
s1, respectively setting standard tension values of an uncoiler at an inlet and a coiling machine at an outlet according to process requirements;
s2, after the rolling roll gap is pressed, when the rolling force reaches 2000KN, an operator starts to manually establish tension values of the uncoiler and the coiling machine;
s3, stopping when the established tension value reaches 60% of the tension value set in the step S1 (too small tension cannot fully tighten the strip, and the strip can be thrown off);
s4, rolling mill starting, wherein the rolling mill speed and the in-out tension value are changed in a speed-up stage (about 1.5 seconds) with the starting speed from 0 to 30m/min, and waiting for 3 seconds again until the rolling mill speed and the tension value are stable;
and S5, after the speed and the tension value of the rolling mill are stable, the operator gradually increases the tension of the uncoiler and the coiling machine to the tension value set in S1 according to the gradient of 3KN/S (the tension is too slow, the efficiency is affected, and the strip is easily torn to cause strip breakage too fast).
6. The method for selecting a gradient of cold rolling increase and decrease of an aluminum coil according to claim 5, wherein: wherein in step S1, the tension range of the unwinder is high gear: 3.5-61 KN, low gear: 7.7-134 KN; the tension range of the coiling machine is a high gear: 3.2-52 KN, low gear: 7-115 KN.
7. The method for selecting a gradient of cold rolling increase and decrease of an aluminum coil according to claim 5, wherein: in the step S2, the stretching direction of the uncoiler to the strip is the direction from the rolling roll gap to the uncoiler, and the stretching direction of the coiling machine to the strip is the direction from the rolling roll gap to the coiling machine; wherein, a front guide roller set, a rolling roller set and a rear guide roller set are sequentially arranged between the uncoiler and the coiling machine along the conveying direction of the strip.
CN202311457893.8A 2023-11-04 2023-11-04 Method for selecting gradient of cold rolling rising and reducing of aluminum coiled material Pending CN117634147A (en)

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CN202311457893.8A CN117634147A (en) 2023-11-04 2023-11-04 Method for selecting gradient of cold rolling rising and reducing of aluminum coiled material

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CN117634147A true CN117634147A (en) 2024-03-01

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