CN109518104A - The method for eliminating cold rolling aluminium flanging part annealing hickie - Google Patents
The method for eliminating cold rolling aluminium flanging part annealing hickie Download PDFInfo
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- CN109518104A CN109518104A CN201811372384.4A CN201811372384A CN109518104A CN 109518104 A CN109518104 A CN 109518104A CN 201811372384 A CN201811372384 A CN 201811372384A CN 109518104 A CN109518104 A CN 109518104A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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Abstract
The invention discloses a kind of methods of elimination cold rolling aluminium flanging part annealing hickie, are related to field of aluminum alloy heat treatment technology, it is the following steps are included: aluminium rolls up rolling pass before A, full annealing；Its practical camber control is 0 ~ 0.2%；B, tensile stress is batched in 25MPa or more before control annealing；C, each at two edge 40mm~120mm of aluminium volume to make a call to 1 steel band；D, it anneals, purging blower and negative-pressure air fan are closed in furnace cooling, are opened other cooling system, are come out of the stove when material temperature is down to 200 DEG C or less.Compared with prior art, the present invention can solve existing aluminium volume edge during full annealing there is the problem of white spot defect.
Description
Technical field
It is especially a kind of for eliminating aluminium volume during full annealing the present invention relates to field of aluminum alloy heat treatment technology
The method of edge annealing hickie.
Background technique
In aluminium alloy production process, since full annealing can eliminate processing hardening, so that material is restored reset condition, obtain
O state is obtained, thus is often required to carry out full annealing, and carry out corresponding cold deformation after full annealing again, to obtain corresponding state
And performance.For example, 1235 alloy aluminum foil stocks of production 0.25mm thickness, H14 state, it is often necessary in 0.5mm~0.6mm thickness
H14 state could be obtained using 50%~58% cold deformation by carrying out full annealing.For another example, production 1mm thickness, H32 state
5052 lattens, it is necessary to full annealing is carried out in 1.11mm~1.25mm thickness range, using 10%~20%
Cold deformation and the stabilizing annealing in later period could obtain standard H32 state.
However, in the actual production process, we it is often found that, aluminium is rolled up after full annealing, can be in two edge of coiled material
Occurs annealing white spot defect in about 100mm~300mm, as shown in Figure 1, x is the annealing white edge of edge, h is aluminium sheet width.Annealing
The producing cause of hickie is: on the one hand, aluminium alloy strips are often required to the convexity of holding 0~0.8% during cold rolling mill
Degree；Coiled material is in coiling process, despite the presence of coiling tension, seems to have rolled up very closely knit between layers, but due in
The presence of convexity is inevitably present gap, and as shown in Figure 2 and Figure 3, arrow is air stream；On the other hand, aluminium alloy is complete
The metal temperature reached needed for annealing is generally at 300 DEG C or more, for casting 3XXX aluminium alloy, metal needed for full annealing
Temperature is even at 480 DEG C or more；It is well known that aluminium is a kind of very active element, aluminium produces a thin layer at normal temperature
Fine and close oxidation film, as the temperature rises, the reaction speed of aluminium and oxygen are accelerated, and more thicker layer oxide films are generated；In
It is when material volume is during anneal, in the apertured region of coiled material edge, air is easily accessible, the oxygen in air and height
Reactive aluminum under temperature generates one layer of thicker oxidation film, and the oxidation film is other than thickness is thicker, also than more loose, because it is
It is formed at high temperature；And not having apertured region in coiled material center portion, air is difficult to enter, without oxygen and reactive aluminum, herein
Oxidation film is very thin, and very fine and close.Then, it is thick loose oxidation film in aluminium flanging part, and is thin densification in center portion
Oxidation film, the oxidation film of two kinds of different-thickness, different consistency is inconsistent for the reflection of light, therefore forms color difference, produces
Raw edge annealing hickie.When aluminium alloy contains magnesium elements (for example, 5XXX aluminium alloy), since the activity of magnesium is bigger than aluminium,
It more easily reacts with oxygen, nitrogen, at this time, it is easier to annealing hickie occur, moreover, content of magnesium is higher, annealing hickie is more obvious.
It can be seen that edge annealing hickie is a kind of oxidation spot in fact.
In order to solve this problem, in aluminium manufacture field, people protect frequently with high pure nitrogen and anneal, but are actually tested
Card still can have annealing hickie, this is because nitrogen and aluminium still can occur chemical anti-although nitrogen activity is not so good as oxygen
It answers, generates aluminium nitride, and aluminium nitride is similar with aluminium oxide, is all one layer of ceramic layer, therefore still generates annealing hickie.In addition,
There are also trials to reduce the measures such as tapping temperature, but through actual verification, effect is still unobvious.
Summary of the invention
It is existing to solve the problem to be solved by the invention is to provide a kind of method of elimination cold rolling aluminium flanging part annealing hickie
There is aluminium volume edge during full annealing the problem of white spot defect occur.
To solve the above-mentioned problems, the technical scheme is that the method for this elimination cold rolling aluminium flanging part annealing hickie
The following steps are included: aluminium rolls up rolling pass before A, full annealing；Its practical camber control is 0 ~ 0.2%；B, before control annealing
Batch tensile stress in 25MPa or more；C, in aluminium volume, two edge are each beats at least 1 steel band；D, it anneals, furnace cooling, closing is blown
Blower and negative-pressure air fan are washed, other cooling system is opened, comes out of the stove when material temperature is down to 200 DEG C or less.
In above-mentioned technical proposal, more specifically scheme be may also is that in step A, and practical camber control is 0.
5%。
It is further: in step B, to batch tensile stress between 25MPa~50MPa before control annealing.
It is further: in step B, to batch tensile stress in 35MPa before control annealing.
It is further: each at two edge 40mm~120mm of aluminium volume to make a call to 1 steel band in step C.
It is further: in step D, to be down to 150 DEG C ~ 200 DEG C when material temperature and come out of the stove.
By adopting the above-described technical solution, compared with prior art, the present invention has the following advantages:
1, the method for this elimination cold rolling aluminium flanging part annealing hickie takes the processing after three steps and annealing before stepping back,
Keep aluminium volume gap minimum, wherein step A, camber is smaller, and interlayer gap is smaller；Distinguishingly, when camber is 0, two boards
For complete plate, interlayer gap is almost nil under coiling tension effect.Therefore, the reality of control aluminium volume rolling pass before annealing
Border camber can make aluminum strip almost become plate between 0~0.2%, this can greatly reduce interlayer gap, have
Effect reduces air and enters interlayer gap, to mitigate reacting for aluminium and oxygen, mitigates annealing hickie.Real data shows camber
Bigger, under the conditions of other conditions are completely the same, annealing hickie is more obvious；
2, wherein step B, coiling tension is bigger, and coiled material roll must be tighter, so that interlayer gap is smaller；
3, wherein step C, through looking into, the thermal expansion coefficient of steel is about 1.18 × 10-5/ DEG C, and the thermal expansion coefficient of aluminium is about 2.32
×10-5/ DEG C, i.e., in contrast, the thermal expansion coefficient of steel is small, and the thermal expansion coefficient of aluminium is big.When the temperature increases, the swell increment of aluminium
Greatly, the swell increment of steel is small, and therefore, the steel band that aluminium rolls up two edge is tied up more and more tighter to aluminium volume, to keep interlayer gap more next
It is smaller, effectively air is stopped to enter interlayer gap；
4, wherein step D, the effect for purging blower are that the fresh normal temperature air of outside is pumped into annealing furnace, and the work of smoke exhaust fan
With being to be extracted into the high temperature air inside annealing furnace outside annealing furnace.In the present invention, why cooled down using other cooling system,
Rather than cooled down by purging and negative-pressure air fan, it is primarily due to, fresh air can all be made by purging blower and negative-pressure air fan
Into annealing furnace, increasing fresh oxygen, (in annealing process, gradually with reactive aluminum, oxygen contains for oxygen inside annealing furnace
Measure fewer and fewer), fresh oxygen continuation and reactive aluminum can be caused, aggravate annealing hickie.And other cooling system is by annealing furnace
Furnace wall leads to cooling water, and fresh air will not be increased newly by reducing inboard wall of burner hearth temperature to reduce the temperature of burner hearth inner air, can
To effectively prevent the exacerbation of annealing hickie.It is all that aluminium volume is directly hung out into annealing furnace, wind after annealing in conventional operation
Machine cooling.Annealing hickie consists of two parts at this time: furnace high-temperature oxidation and the outer high-temperature oxydation of furnace.After aluminium volume annealing,
Furnace cooling why is wanted to come out of the stove again to 200 DEG C or less, exactly in order to reduce high-temperature oxydation outside furnace；
By combination of the above measure, it can greatly mitigate annealing hickie to extremely slight degree, almost eliminate.Using this hair
Bright the method carries out the aluminium volume of full annealing, and annealing hickie will not be generated after annealing, the consistency of surface quality is improved, subtracts
Customer complaint is lacked, avoiding is reduced the caused yield rate of annealing hickie excision by ultra-wide trimming.
Detailed description of the invention
Fig. 1 is aluminium sheet edge annealing white spot defect schematic diagram；
Fig. 2 is aluminium volume cross-sectional view；
Fig. 3 is the A-A cross-sectional view of Fig. 2.
Specific embodiment
The embodiment of the present invention is described in further detail below:
Embodiment one:
The method processing aluminium volume 1 of this elimination cold rolling aluminium flanging part annealing hickie, alloy 1235, thickness 4.0mm, width 1350mm,
The following steps are included:
A, before full annealing, aluminium rolls up rolling pass；Its practical camber control is 0；
B, tensile stress is batched in 25MPa before control annealing；
C, each at two edge 40mm of aluminium volume to make a call to 1 steel band；
D, it then anneals, anneals 550 DEG C of furnace gas temperature, 500 DEG C of material temperature, keep the temperature program stopped after 5h, furnace cooling is closed
Blower and negative-pressure air fan are purged, other cooling system is opened, comes out of the stove when material temperature is down to 150 DEG C or less.It is cooled to room temperature rear uncoiling inspection
It looks into, has no annealing hickie.
Embodiment two:
The method processing aluminium volume 2 of this elimination cold rolling aluminium flanging part annealing hickie, alloy 5052, thickness 1.17mm, width 1350mm,
The following steps are included:
A, before full annealing, aluminium rolls up rolling pass；Its practical camber control is 0.2%；
B, tensile stress is batched in 50MPa before control annealing；
C, each at two edge 120mm of aluminium volume to make a call to 1 steel band；
D, it then anneals, anneals 380 DEG C of furnace gas temperature, 320 DEG C of material temperature, keep the temperature program stopped after 3h, close purging blower
And negative-pressure air fan, other cooling system is opened, material temperature is come out of the stove after being down to 200 DEG C.It is cooled to room temperature rear uncoiling, has no that annealing is white
Spot.
Embodiment three:
The method processing aluminium volume 2 of this elimination cold rolling aluminium flanging part annealing hickie, alloy 5052, thickness 1.17mm, width 1350mm,
The following steps are included:
A, before full annealing, aluminium rolls up rolling pass；Its practical camber control is 0.1%；
B, tensile stress is batched in 35MPa or more before control annealing；
C, each at two edge 80mm of aluminium volume to make a call to 1 steel band；
D, it then anneals, anneals 450 DEG C of furnace gas temperature, 450 DEG C of material temperature, keep the temperature program stopped after 3h, close purging blower
And negative-pressure air fan, other cooling system is opened, material temperature is come out of the stove after being down to 175 DEG C.It is cooled to room temperature rear uncoiling, has no that annealing is white
Spot.
In other embodiments, any number between step A concavity at central section can also be 0~0.2%, batching for step B are answered
Power can also be any number between 25MPa~50MPa, and step C can also be in any place of two edge 40mm~120mm of aluminium volume
Each to make a call to 1 steel band, the material temperature cooling degree of step D is come out of the stove when can be 150 DEG C ~ 200 DEG C of arbitrary temp.
Claims (6)
1. a kind of method for eliminating cold rolling aluminium flanging part annealing hickie, it is characterised in that the following steps are included:
A, before full annealing, aluminium rolls up rolling pass；Its practical camber control is 0~0.2%；
B, tensile stress is batched in 25MPa or more before control annealing；
C, in aluminium volume, two edge are each beats at least 1 steel band；
D, it anneals, purging blower and negative-pressure air fan are closed in furnace cooling, other cooling system are opened, when material temperature is down to 200 DEG C or less
It comes out of the stove.
2. the method according to claim 1 for eliminating cold rolling aluminium flanging part annealing hickie, it is characterised in that: in step A,
Crown control is 0. 15% in practice.
3. the method according to claim 1 for eliminating cold rolling aluminium flanging part annealing hickie, it is characterised in that: in step B, control
Tensile stress is batched between 25MPa~50MPa before system annealing.
4. the method according to claim 1 for eliminating cold rolling aluminium flanging part annealing hickie, it is characterised in that: in step B, control
Tensile stress is batched in 35MPa before system annealing.
5. the method according to claim 1 for eliminating cold rolling aluminium flanging part annealing hickie, it is characterised in that: in step C,
It is each at two edge 40mm~120mm of aluminium volume to make a call to 1 steel band.
6. the method according to claim 1 for eliminating cold rolling aluminium flanging part annealing hickie, it is characterised in that: in step D, when
Material temperature is down to 150 DEG C ~ 200 DEG C and comes out of the stove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811372384.4A CN109518104B (en) | 2018-11-19 | 2018-11-19 | Method for eliminating annealing white spots at edge of cold-rolled aluminum coil |
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| CN201811372384.4A CN109518104B (en) | 2018-11-19 | 2018-11-19 | Method for eliminating annealing white spots at edge of cold-rolled aluminum coil |
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| CN109518104B CN109518104B (en) | 2020-12-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113373389A (en) * | 2021-04-07 | 2021-09-10 | 西南铝业（集团）有限责任公司 | Method for controlling intermediate annealing oil spots of aluminum alloy coiled material |
| CN115161452A (en) * | 2022-05-19 | 2022-10-11 | 浙江佑丰新材料股份有限公司 | Method for eliminating 8011 aluminum foil blank edge annealing white spots |
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Cited By (2)
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| CN115161452A (en) * | 2022-05-19 | 2022-10-11 | 浙江佑丰新材料股份有限公司 | Method for eliminating 8011 aluminum foil blank edge annealing white spots |
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| CN109518104B (en) | 2020-12-01 |
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