CN113083945A - Preparation method of new energy automobile battery box end plate aluminum profile - Google Patents
Preparation method of new energy automobile battery box end plate aluminum profile Download PDFInfo
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- CN113083945A CN113083945A CN202110294253.4A CN202110294253A CN113083945A CN 113083945 A CN113083945 A CN 113083945A CN 202110294253 A CN202110294253 A CN 202110294253A CN 113083945 A CN113083945 A CN 113083945A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 130
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 181
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 80
- 238000001816 cooling Methods 0.000 claims abstract description 49
- 238000001125 extrusion Methods 0.000 claims abstract description 20
- 230000009467 reduction Effects 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims description 25
- 238000005096 rolling process Methods 0.000 claims description 23
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000000704 physical effect Effects 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 229910000838 Al alloy Inorganic materials 0.000 description 17
- 230000006872 improvement Effects 0.000 description 10
- 239000013078 crystal Substances 0.000 description 8
- 229910021338 magnesium silicide Inorganic materials 0.000 description 8
- YTHCQFKNFVSQBC-UHFFFAOYSA-N magnesium silicide Chemical compound [Mg]=[Si]=[Mg] YTHCQFKNFVSQBC-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000036314 physical performance Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/003—Cooling or heating of work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/006—Gas treatment of work, e.g. to prevent oxidation or to create surface effects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/16—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to the field of aluminum profiles, in particular to a preparation method of an aluminum profile of a new energy automobile battery box end plate, which comprises the following steps: firstly, processing an aluminum ingot, performing extrusion operation, extruding to form an aluminum plate, wherein the thickness of the aluminum plate is less than 10mm, the extrusion temperature is 520-550 ℃, the extruded aluminum plate enters a nitrogen protection box through a nitrogen channel, the pressure of the nitrogen protection box is 1-5 MPa, and then performing pressure maintaining treatment, wherein the pressure maintaining time is not less than 10 s; secondly, after pressure maintaining, slowly reducing the pressure of the nitrogen protection box to the standard atmospheric pressure, wherein the pressure reduction time is longer when the pressure of the nitrogen protection box is higher, and is 30-180 s, and then outputting; and thirdly, cooling the output aluminum plate, and then outputting the aluminum plate for subsequent forming. The technical problem that the physical property of an existing aluminum profile in the extrusion forming process cannot adapt to the performance of a battery box in the new energy automobile industry is solved.
Description
Technical Field
The invention relates to the field of aluminum profiles, in particular to a preparation method of an aluminum profile of a new energy automobile battery box end plate.
Background
At present, the battery case of new forms of energy all is used for installing battery module usually, like chinese patent application no: CN201711132909.2 discloses a battery module, which comprises: a battery assembly including a plurality of batteries arranged in a longitudinal direction; a heat-conductive upper cover plate positioned above the battery assembly; and the cooling plate is fixedly arranged above the heat-conducting upper cover plate. In the battery module according to the present invention, since the heat-conductive upper cover plate has heat conductivity and the cooling plate is fixedly disposed above the heat-conductive upper cover plate, the heat-conductive upper cover plate can directly and rapidly transfer heat of the tops of the respective batteries of the battery assembly into the cooling plate when the battery module is operated, thereby achieving cooling of the respective batteries in the battery assembly via the cooling plate.
In order to achieve better heat dissipation, the end plates, the side plates, and other components are usually made of aluminum profiles. However, because of the need for light weight, aluminum profiles with large thickness are not always adopted, and the aluminum profiles themselves should have good oxidation resistance and corrosion resistance, so as to achieve the purpose of long service life. This puts higher demands on the aluminium profiles.
Chinese patent application No.: CN202011261794.9 discloses an aluminium alloy production technology for car battery end plate, relates to car battery end plate technical field, has solved present aluminium alloy ex-trusions for new energy automobile battery end and has easily appeared the not up to standard technical problem of tensile strength after friction stir welding in the in-service use. The production process of the aluminum profile for the automobile battery end plate comprises the steps of S1 casting, S2 homogenizing and S3 extruding. The aluminum alloy section produced by the production process of the aluminum section for the automobile battery end plate has high mechanical property and good welding property, meets the performance requirement of the aluminum section for the new energy automobile battery end plate, avoids cracking of the joint of the end plate and the side plate caused by the expansion force generated by the internal chemical reaction of a power battery, avoids potential safety hazards brought to automobile operation, and reduces the use cost of users.
The aluminum profile is mainly improved from the raw material of the aluminum profile, and good physical properties are realized. However, in the production process of the aluminum profile, the aluminum profile is often extruded by an aluminum ingot, and how to utilize a better extrusion process is also very important for improving the physical properties of the aluminum profile. The aluminum profile of the end plate of the battery box usually needs to be subjected to more subsequent processing, such as drilling, bending, stamping and the like, and the aluminum profile is critical to stress elimination.
Disclosure of Invention
Therefore, aiming at the problems, the invention provides a preparation method of an aluminum profile of a battery box end plate of a new energy automobile, which solves the technical problem that the physical property of the existing aluminum profile in the extrusion forming process cannot adapt to the battery box property in the new energy automobile industry.
In order to achieve the purpose, the invention adopts the following technical scheme: a preparation method of a new energy automobile battery box end plate aluminum profile comprises the following steps:
firstly, processing an aluminum ingot, performing extrusion operation, extruding to form an aluminum plate, wherein the thickness of the aluminum plate is less than 10mm, the extrusion temperature is 520-550 ℃, the extruded aluminum plate enters a nitrogen protection box through a nitrogen channel, the pressure of the nitrogen protection box is 1-5 MPa, and then performing pressure maintaining treatment, wherein the pressure maintaining time is not less than 10 s;
secondly, after pressure maintaining, slowly reducing the pressure of the nitrogen protection box to the standard atmospheric pressure, wherein the pressure reduction time is longer when the pressure of the nitrogen protection box is higher, and is 30-180 s, and then outputting;
and thirdly, cooling the output aluminum plate, and then outputting the aluminum plate for subsequent forming.
Further, in the first step, when the thickness of the aluminum plate is larger, the rolling mechanism is used for carrying out secondary rolling, 2/3 with the thickness smaller than that of the aluminum plate is larger than 1/2 of the thickness of the aluminum plate, and the rolling mechanism is positioned in the nitrogen channel.
Furthermore, a heating channel for protecting the temperature of the aluminum plate is arranged at the inlet end of the rolling mechanism, the aluminum plate firstly passes through the heating channel and then enters the rolling mechanism, the temperature of the heating channel is 480-520 ℃, and the minimum distance between the aluminum plate and the heating channel is 100 mm.
Furthermore, the heating channel is an annular channel, and an aggregation cover for realizing heat aggregation is arranged on the outer side of the annular channel.
Furthermore, the gathering cover is made of high-temperature-resistant materials, and a reflecting layer is arranged on the inner wall of the gathering cover.
Further, the time for the aluminum plate to pass through the nitrogen passage was not more than 10 seconds.
Further, the nitrogen protection case includes the box, locates the cavity in the box, be equipped with the access way that is used for holding aluminum plate to get into on both ends respectively about the box, access way is linked together with the cavity, be equipped with the sealing mechanism who is used for realizing sealing access way on both ends respectively about the box, it is equipped with roller set and lower roller set to lie in the cavity on the box, go up roller set and lower roller set and constitute the transfer passage who is used for carrying aluminum plate, transfer passage projection on the perpendicular is located the within range of access way, be equipped with the nitrogen gas passageway that is used for communicateing outside defeated nitrogen equipment on the upper and lower both ends of box respectively.
Furthermore, a cooling mechanism for auxiliary cooling is arranged in the box body.
Furthermore, in the second step, when the nitrogen protection box performs the pressure reduction operation, one nitrogen channel discharges nitrogen, the other nitrogen channel inputs nitrogen, and the pressure of the input nitrogen is smaller than that of the discharged nitrogen, so that the temperature reduction is realized.
And further, in the third step, firstly, air cooling is carried out to reduce the temperature of the aluminum plate to be below 200 ℃, and then water cooling is carried out to reduce the temperature to the normal temperature.
By adopting the technical scheme, the invention has the beneficial effects that:
1. this scheme passes through the setting of nitrogen gas passageway and nitrogen gas guard box, can effectively realize the contact of aluminium alloy extrusion back and air to entering into immediately and protecting the aluminium alloy to the nitrogen gas guard box in, can effectively realize the maintenance of temperature, and the maintenance of pressure, reduce the outbreak of aluminium alloy internal stress, reduce appearing of magnesium silicide crystal, thereby realize the improvement of aluminum plate intensity, so that make aluminum plate accord with the demand of new energy automobile battery case's physical property. In addition, through firstly entering the nitrogen channel and then entering the nitrogen protection box, the stability of the magnesium silicide crystal can be better, and the effect of the follow-up treatment of the aluminum plate is improved. Wherein, a small amount of magnesium silicide crystal grains can reduce the capability of particle dislocation, thereby effectively reducing the stress in the section bar, and when the amount is increased, the dislocation action can be inhibited sufficiently, thereby improving the strength of the material, avoiding the natural damage of the section bar with overlarge stress, and further improving the strength of the material. After extrusion, high-pressure nitrogen protection is carried out for a short time, the precipitation of magnesium silicide crystals can be effectively controlled, and excessive waste residues or patterns on the surface or the damage to the aluminum alloy structure can be avoided. In addition, after pressure maintaining, the nitrogen protection box is used for slowly reducing the pressure, the purpose of the nitrogen protection box is similar to the pressure maintaining effect during extrusion, but the nitrogen protection box is still different, in the process of slowly reducing the pressure, the temperature of the aluminum plate also slowly reduces, and the physical property of the aluminum plate is well maintained by the cooperation of pressure reduction, so that the stability of the physical property of the aluminum profile can be effectively realized, and the aluminum profile cannot be greatly changed in the subsequent treatment process.
2. The secondary rolling is arranged, so that when the thickness of the required aluminum profile is small, the situation that once extrusion is not realized any more is solved, the physical performance of the aluminum profile can be greatly reduced, and secondary rolling is required. The rolling mechanism is arranged in the nitrogen channel and is also used for effectively protecting the aluminum profile, although the time of the aluminum profile in the nitrogen channel is prolonged, the aluminum profile can be rolled for the second time, so that the pressure maintaining effect is actually achieved, and the improvement on the physical performance of the aluminum profile can be still ensured.
3. The setting of heating channel, when its aim at carried out the secondary roll-in, can realize the improvement of aluminium alloy temperature, avoid the not enough of aluminium alloy temperature to make the physical properties of aluminium alloy after the secondary roll-in can not produce the snap.
4. The heat collecting cover is arranged to realize temperature collection and avoid large-scale temperature diffusion. The gathering cover is made of high-temperature resistant materials, a reflecting layer is arranged on the inner wall of the gathering cover, and the reflecting layer can be made of conventional materials such as high-temperature resistant reflecting paint and the like.
5. The time for the aluminum plate to pass through the nitrogen channel is not more than 10s, but when the aluminum plate needs to be rolled for the second time, the time needs to be adjusted according to actual needs.
6. The purpose of effectual nitrogen protection can be realized to the setting of nitrogen protection case, be equipped with the cooling body who is used for auxiliary cooling in the box, when temperature reduction range is less, can not reach the output condition, can carry out auxiliary cooling through cooling body. The cooling mechanism may be a conventional cooling mechanism such as an evaporator, a chill roll, or the like. Can set up into the chill roll with last roller set, lower roller group in this scheme, can set up temperature sensor, pressure sensor in the box and realize the affirmation of box internal environment. When the cooling roller cooling is needed, the cooling roller is not directly cooled, the left and right displacement of the aluminum plate is achieved through the clockwise and anticlockwise continuous changes of the upper roller set and the lower roller set, then cooling is conducted, the cooling position is not fixed on the same line any more, but the uniform distribution can be achieved on the surface of the aluminum plate, and therefore the aluminum plate is effectively protected.
7. In the second step, when the nitrogen protection case carried out the step-down operation, one of them nitrogen gas passageway discharge nitrogen gas, another nitrogen gas passageway input nitrogen gas, the pressure of input nitrogen gas is less than the pressure of discharge nitrogen gas to this realizes the cooling, has effectively realized the accurate control of step-down like this, and can effectively take away the temperature, thereby realizes step-down, the two operations of cooling, realizes the improvement of aluminum plate physical properties.
8. The cooling adopts two-step cooling, and the improvement of the physical properties of the aluminum plate is also realized.
Drawings
FIG. 1 is a schematic structural view of a nitrogen gas channel of the present invention;
FIG. 2 is a schematic diagram of the nitrogen enclosure of the present invention;
fig. 3 is a schematic view of the structure of the heating channel of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and detailed description.
Referring to fig. 1 to 3, the embodiment provides a preparation method of an end plate aluminum profile of a battery box of a new energy automobile, including the following steps:
firstly, processing an aluminum ingot, performing extrusion operation, extruding to form an aluminum plate, wherein the thickness of the aluminum plate is less than 10mm, the extrusion temperature is 520-550 ℃, the extruded aluminum plate enters a nitrogen protection box through a nitrogen channel 1, the pressure of the nitrogen protection box is 1-5 MPa, and then performing pressure maintaining treatment, wherein the pressure maintaining time is not less than 10 s;
secondly, after pressure maintaining, slowly reducing the pressure of the nitrogen protection box to the standard atmospheric pressure, wherein the pressure reduction time is longer when the pressure of the nitrogen protection box is higher, and is 30-180 s, and then outputting;
and thirdly, cooling the output aluminum plate, firstly performing air cooling to reduce the temperature of the aluminum plate to below 200 ℃, then performing water cooling to reduce the temperature to normal temperature, and then outputting for subsequent forming.
The extrusion temperature can be selected according to actual needs, and the scheme only gives a preferable range, such as 480, 490, 500, 510, 520, 530, 540, 550, 560 ℃ and the like. The pressure of the nitrogen protection box is also an effective choice according to different aluminum profiles and different thicknesses, and generally, the 3MP is set to be a relatively common value. The same holds for the pressure maintaining time, and 11s, 15s, 18s, 20s, 30s and the like can be selected in the scheme.
When the thickness of the aluminum plate is larger, the secondary rolling is carried out by using the rolling mechanism 2, the rolled thickness is 2/3 which is smaller than the thickness of the aluminum plate and is more than 1/2 of the thickness of the aluminum plate, the rolling mechanism 2 is positioned in the nitrogen channel, and the rolling mechanism comprises an upper pressing roller 21 and a lower pressing roller 22. The inlet end of the rolling mechanism 2 is provided with a heating channel 3 for protecting the temperature of the aluminum plate, the aluminum plate firstly passes through the heating channel and then enters the rolling mechanism, the temperature of the heating channel is 480-520 ℃, and the minimum distance between the aluminum plate and the heating channel is 100 mm. The heating channel is an annular channel, and the outer side of the annular channel 3 is provided with a gathering cover 4 for realizing heat gathering. The gathering cover 4 is made of high-temperature resistant materials, and a reflecting layer 5 is arranged on the inner wall of the gathering cover 4.
The temperature of the heating channel can be selected according to actual needs, and the scheme only gives a preferable range, such as 450, 460, 470, 480, 490, 500, 510, 520 and 530 ℃.
The nitrogen protection box comprises a box body 61 and a cavity 62 arranged in the box body 61, wherein an access passage 611 used for accommodating an aluminum plate to enter is arranged at each of the left end and the right end of the box body 61, the access passage 611 is communicated with the cavity 62, a sealing mechanism 63 used for sealing the access passage is arranged at each of the left end and the right end of the box body 61, and the sealing mechanism can be a block and a driving mechanism used for driving the block to block and separate, such as an oil cylinder. An upper roller set 64 and a lower roller set 65 are arranged in the cavity on the box body 61, the upper roller set 64 and the lower roller set 65 form a conveying channel 66 for conveying aluminum plates, the projection of the conveying channel 66 on the vertical plane is located in the range of the inlet and outlet channel 611, and nitrogen channels 612 for communicating with external nitrogen conveying equipment are respectively arranged at the upper end and the lower end of the box body 61. The upper roller set 64 and the lower roller set 65 are both composed of a plurality of cooling rollers. In the second step, when the nitrogen protection box performs the pressure reduction operation, one nitrogen channel discharges nitrogen, the other nitrogen channel inputs nitrogen, and the pressure of the input nitrogen is smaller than that of the discharged nitrogen, so that the temperature reduction is realized.
When the secondary rolling is not needed, the time for the aluminum plate to pass through the nitrogen channel is set to be less than 10s, so that the efficiency can be effectively improved.
By adopting the technical scheme, the invention has the beneficial effects that:
1. this scheme passes through the setting of nitrogen gas passageway and nitrogen gas guard box, can effectively realize the contact of aluminium alloy extrusion back and air to entering into immediately and protecting the aluminium alloy to the nitrogen gas guard box in, can effectively realize the maintenance of temperature, and the maintenance of pressure, reduce the outbreak of aluminium alloy internal stress, reduce appearing of magnesium silicide crystal, thereby realize the improvement of aluminum plate intensity, so that make aluminum plate accord with the demand of new energy automobile battery case's physical property. In addition, through firstly entering the nitrogen channel and then entering the nitrogen protection box, the stability of the magnesium silicide crystal can be better, and the effect of the follow-up treatment of the aluminum plate is improved. Wherein, a small amount of magnesium silicide crystal grains can reduce the capability of particle dislocation, thereby effectively reducing the stress in the section bar, and when the amount is increased, the dislocation action can be inhibited sufficiently, thereby improving the strength of the material, avoiding the natural damage of the section bar with overlarge stress, and further improving the strength of the material. After extrusion, high-pressure nitrogen protection is carried out for a short time, the precipitation of magnesium silicide crystals can be effectively controlled, and excessive waste residues or patterns on the surface or the damage to the aluminum alloy structure can be avoided. In addition, after pressure maintaining, the nitrogen protection box is used for slowly reducing the pressure, the purpose of the nitrogen protection box is similar to the pressure maintaining effect during extrusion, but the nitrogen protection box is still different, in the process of slowly reducing the pressure, the temperature of the aluminum plate also slowly reduces, and the physical property of the aluminum plate is well maintained by the cooperation of pressure reduction, so that the stability of the physical property of the aluminum profile can be effectively realized, and the aluminum profile cannot be greatly changed in the subsequent treatment process.
2. The secondary rolling is arranged, so that when the thickness of the required aluminum profile is small, the situation that once extrusion is not realized any more is solved, the physical performance of the aluminum profile can be greatly reduced, and secondary rolling is required. The rolling mechanism is arranged in the nitrogen channel and is also used for effectively protecting the aluminum profile, although the time of the aluminum profile in the nitrogen channel is prolonged, the aluminum profile can be rolled for the second time, so that the pressure maintaining effect is actually achieved, and the improvement on the physical performance of the aluminum profile can be still ensured.
3. The setting of heating channel, when its aim at carried out the secondary roll-in, can realize the improvement of aluminium alloy temperature, avoid the not enough of aluminium alloy temperature to make the physical properties of aluminium alloy after the secondary roll-in can not produce the snap.
4. The heat collecting cover is arranged to realize temperature collection and avoid large-scale temperature diffusion. The gathering cover is made of high-temperature resistant materials, a reflecting layer is arranged on the inner wall of the gathering cover, and the reflecting layer can be made of conventional materials such as high-temperature resistant reflecting paint and the like.
5. The time for the aluminum plate to pass through the nitrogen channel is not more than 10s, but when the aluminum plate needs to be rolled for the second time, the time needs to be adjusted according to actual needs.
6. The purpose of effectual nitrogen protection can be realized to the setting of nitrogen protection case, be equipped with the cooling body who is used for auxiliary cooling in the box, when temperature reduction range is less, can not reach the output condition, can carry out auxiliary cooling through cooling body. The cooling mechanism may be a conventional cooling mechanism such as an evaporator, a chill roll, or the like. Can set up into the chill roll with last roller set, lower roller group in this scheme, can set up temperature sensor, pressure sensor in the box and realize the affirmation of box internal environment. When the cooling roller cooling is needed, the cooling roller is not directly cooled, the left and right displacement of the aluminum plate is achieved through the clockwise and anticlockwise continuous changes of the upper roller set and the lower roller set, then cooling is conducted, the cooling position is not fixed on the same line any more, but the uniform distribution can be achieved on the surface of the aluminum plate, and therefore the aluminum plate is effectively protected.
7. In the second step, when the nitrogen protection case carried out the step-down operation, one of them nitrogen gas passageway discharge nitrogen gas, another nitrogen gas passageway input nitrogen gas, the pressure of input nitrogen gas is less than the pressure of discharge nitrogen gas to this realizes the cooling, has effectively realized the accurate control of step-down like this, and can effectively take away the temperature, thereby realizes step-down, the two operations of cooling, realizes the improvement of aluminum plate physical properties.
8. The cooling adopts two-step cooling, and the improvement of the physical properties of the aluminum plate is also realized.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The preparation method of the new energy automobile battery box end plate aluminum profile is characterized by comprising the following steps:
firstly, processing an aluminum ingot, performing extrusion operation, extruding to form an aluminum plate, wherein the thickness of the aluminum plate is less than 10mm, the extrusion temperature is 520-550 ℃, the extruded aluminum plate enters a nitrogen protection box through a nitrogen channel, the pressure of the nitrogen protection box is 1-5 MPa, and then performing pressure maintaining treatment, wherein the pressure maintaining time is not less than 10 s;
secondly, after pressure maintaining, slowly reducing the pressure of the nitrogen protection box to the standard atmospheric pressure, wherein the pressure reduction time is longer when the pressure of the nitrogen protection box is higher, and is 30-180 s, and then outputting;
and thirdly, cooling the output aluminum plate, and then outputting the aluminum plate for subsequent forming.
2. The preparation method of the new energy automobile battery box end plate aluminum profile according to claim 1, characterized by comprising the following steps: in the first step, when the thickness of the aluminum plate is larger, secondary rolling is carried out by using a rolling mechanism, the rolled thickness is 2/3 which is smaller than the thickness of the aluminum plate and is more than 1/2 of the thickness of the aluminum plate, and the rolling mechanism is positioned in a nitrogen channel.
3. The preparation method of the new energy automobile battery box end plate aluminum profile according to claim 2 is characterized in that: the inlet end of the rolling mechanism is provided with a heating channel for protecting the temperature of the aluminum plate, the aluminum plate firstly passes through the heating channel and then enters the rolling mechanism, the temperature of the heating channel is 480-520 ℃, and the minimum distance between the aluminum plate and the heating channel is 100 mm.
4. The preparation method of the new energy automobile battery box end plate aluminum profile is characterized in that: the heating channel is an annular channel, and the outer side of the annular channel is provided with a gathering cover for realizing heat gathering.
5. The preparation method of the new energy automobile battery box end plate aluminum profile is characterized in that: the gathering cover is made of high-temperature-resistant materials, and a reflecting layer is arranged on the inner wall of the gathering cover.
6. The preparation method of the new energy automobile battery box end plate aluminum profile according to claim 1, characterized by comprising the following steps: the time for the aluminum plate to pass through the nitrogen channel was not more than 10 seconds.
7. The preparation method of the new energy automobile battery box end plate aluminum profile according to any one of claims 1 to 5, characterized in that: the nitrogen protection case includes the box, locates the cavity in the box, be equipped with the access way that is used for holding aluminum plate to get into on both ends respectively about the box, access way is linked together with the cavity, be equipped with the sealing mechanism who is used for realizing sealing the access way on both ends respectively about the box, lie in the cavity on the box and be equipped with roller set and lower roller set, go up roller set and lower roller set and constitute the transfer passage who is used for carrying aluminum plate, transfer passage projection on the perpendicular is located the within range of access way, be equipped with the nitrogen gas passageway that is used for the outside defeated nitrogen equipment of intercommunication on the upper and lower both ends of box respectively.
8. The preparation method of the new energy automobile battery box end plate aluminum profile according to claim 7 is characterized in that: the upper roller group and the lower roller group are both composed of a plurality of cooling rollers.
9. The preparation method of the new energy automobile battery box end plate aluminum profile according to claim 7 is characterized in that: in the second step, when the nitrogen protection box performs the pressure reduction operation, one nitrogen channel discharges nitrogen, the other nitrogen channel inputs nitrogen, and the pressure of the input nitrogen is smaller than that of the discharged nitrogen, so that the temperature reduction is realized.
10. The preparation method of the new energy automobile battery box end plate aluminum profile according to any one of claims 1 to 5, characterized in that: and in the third step, firstly, air cooling is carried out to reduce the temperature of the aluminum plate to below 200 ℃, and then water cooling is carried out to reduce the temperature to the normal temperature.
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| CN113083944A (en) * | 2021-03-19 | 2021-07-09 | 福建省闽发铝业股份有限公司 | Preparation method of new energy automobile battery box side plate aluminum profile |
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