CN113734296A - Be applied to aluminum alloy threshold roof beam of car - Google Patents
Be applied to aluminum alloy threshold roof beam of car Download PDFInfo
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- CN113734296A CN113734296A CN202111077313.3A CN202111077313A CN113734296A CN 113734296 A CN113734296 A CN 113734296A CN 202111077313 A CN202111077313 A CN 202111077313A CN 113734296 A CN113734296 A CN 113734296A
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- aluminum alloy
- cavity unit
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- doorsill
- energy
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 49
- 238000005452 bending Methods 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 14
- 230000037396 body weight Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 18
- 229910052782 aluminium Inorganic materials 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000000956 alloy Substances 0.000 description 6
- 238000009864 tensile test Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000011651 chromium Substances 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 210000001624 hip Anatomy 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/20—Floors or bottom sub-units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
- B62D29/008—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of light alloys, e.g. extruded
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The invention provides an aluminum alloy doorsill beam applied to an automobile, wherein the doorsill beam is of a structure in a shape like a Chinese character 'mu', the doorsill beam comprises a first cavity unit, a second cavity unit and a third cavity unit which are sequentially connected and integrally formed, the first cavity unit is a hollow isosceles trapezoid body, the second cavity unit and the third cavity unit are hollow cuboids, and the lower bottom surface of the isosceles trapezoid body is integrally connected to one surface of the second cavity unit. After adopting above-mentioned technical scheme, when the vehicle takes place the side and bumps, the threshold roof beam of this application except that aluminum alloy itself warp and possess the energy-absorbing effect, is the first-order energy-absorbing die cavity of first die cavity unit that is isosceles trapezoid structure, and second die cavity unit and third die cavity unit are crumpled step by step and are contracted to realize tertiary energy-absorbing effect, avoid giving the structure in the car and behind the car with the collision energy, improved the side of whole car and bumped the ability and reduced automobile body weight.
Description
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to an aluminum alloy doorsill beam applied to an automobile.
Background
At present automobile body structure is mostly the integral structure, and threshold roof beam becomes an organic whole with A post welding promptly, and the two joint strength is higher, avoids deforming early in the collision to ensure that collision energy in time transmits the structure in the car and behind the car.
However, the current vehicle body structure has the following two defects:
(1) the energy-absorbing device only has the energy transmission effect and the supporting effect, but does not have the effect of absorbing collision energy.
(2) At present, power batteries of new energy vehicles are all installed on threshold beams, and when the new energy vehicles collide laterally, extreme safety accidents such as battery explosion and the like caused by impact on the power batteries can be caused besides injury to people in the vehicles.
Therefore, it is important to improve the overall performance of the rocker beam.
Disclosure of Invention
In order to overcome the technical defects of the existing automobile body structure, the invention aims to provide an aluminum alloy doorsill beam applied to an automobile, wherein the doorsill beam is of a structure in a shape like a Chinese character 'mu', the doorsill beam comprises a first cavity unit, a second cavity unit and a third cavity unit which are sequentially connected and integrally formed, and the first cavity unit is a hollow isosceles trapezoid body and is convenient for absorbing and decomposing collision energy; the second cavity unit and the third cavity unit are both hollow cuboids, so that the absorption of collision energy is facilitated; the lower bottom surface of the isosceles trapezoid body is integrally connected to one surface of the second cavity unit.
The size of the sill beam of the present application can be adjusted according to actual needs (e.g., the size of the vehicle door and the battery pack).
When a vehicle is laterally collided, the two waists of the isosceles trapezoid can be compressed and deformed from the upper bottom surface facing the outside of the vehicle to the lower bottom surface facing the inside of the vehicle, so that the collision force is decomposed by the self deformation of the first cavity unit, and the energy absorption effect is achieved, and the isosceles trapezoid is a first-stage energy absorption cavity. In addition, the collision force gradually collapses to second die cavity unit and third die cavity unit along first die cavity unit to realize tertiary energy-absorbing effect altogether, avoid giving the structure in the car and behind the car with the collision energy transfer, improved the side impact ability of whole car.
Further, each threshold roof beam set up in the battery package with between the B post, the last bottom surface of the isosceles trapezoid body of first die cavity unit is towards the B post of car door, the lower bottom surface of waist trapezoid body is towards a side of battery package, a threshold roof beam is installed respectively to the left and right sides of battery package.
Further, the doorsill beam is made of an aluminum alloy section, and the thickness of the aluminum alloy section is 4.5 +/-0.25 mm. This thickness range not only enables a large amount of energy to be absorbed, but also reduces the weight of the vehicle body.
Further, the maximum bending angle of the aluminum alloy profile after vertical extrusion is 85 +/-5 degrees. The aluminum alloy section has the advantages of good performance, high bending angle and low possibility of fracture, so that the effect of gradual energy absorption can be realized.
Further, the aluminum alloy comprises the following components in percentage by weight: 0.762% Si, 0.127% Fe, 0.095% Cu, 0.582% Mg, 0.464% Mn, 0.013% Zn, 0.021% Ti, 0.081% Cr, and the balance of Al.
Further, the aging process of the aluminum alloy during preparation is 210 +/-5 ℃, and the temperature is kept for 4 hours. Therefore, the mechanical strength of the aluminum alloy section can be improved, and the energy absorption is high.
Further, the aluminum alloy is under the state of 6008T7 and has the tensile strength of RmNot less than 265MPa, yield strength Rp0.2250 to 290MPa and elongation A50mm≥13％。
Further, the grain size of the aluminum alloy is 60-80 microns. The aluminum alloy with the grain size of 60-80 microns is finer and more uniform in structure, high in toughness, more in absorbed energy and not easy to be brittle or broken.
Further, the threshold beam is gradually collapsed when being collided, the total absorbed energy is 30.0KJ-45.0KJ, the absorbed energy of the first cavity unit is 5-10KJ, the absorbed energy of the second cavity unit is 10-20KJ, and the absorbed energy of the third cavity unit is 15-25 KJ.
Further, the maximum bearing force of the threshold beam is 480 +/-10 KN.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
when the vehicle takes place the side and bumps, the threshold roof beam of this application except that aluminum alloy itself warp and possess the energy-absorbing effect, is the first-level energy-absorbing die cavity of the first die cavity unit that is isosceles trapezoid structure, and second die cavity unit and third die cavity unit are crumpled step by step and are contracted to realize tertiary energy-absorbing effect, avoid giving the structure in the car and behind the car with the collision energy, improved the side of whole car and bumped the ability and reduced automobile body weight. The safety of personnel in the vehicle and the safety of the battery pack are protected to the greatest extent in a limited space, extreme safety accidents such as battery explosion and the like caused by impact on the power battery are avoided, and meanwhile, the feasibility and the light-weight requirement of the process are met.
Drawings
FIG. 1 is a schematic longitudinal cross-sectional view of a sill beam of the cross-hatch configuration of an embodiment of the present application;
FIG. 2 is an assembled view of a rocker beam according to an embodiment of the present application;
FIG. 3 is a cross-sectional view of FIG. 2 with the battery pack installed in the underbody of the automobile and the rocker beam disposed between the B-pillar and the battery pack;
FIG. 4 is a schematic view of a bending angle test of an aluminum alloy profile according to an embodiment of the present disclosure;
FIG. 5 is a graph showing the measurement of crystal grains of an aluminum alloy material according to an embodiment of the present application;
FIG. 6 is a graph showing mechanical properties of an aluminum-alloy material according to an embodiment of the present application;
fig. 7 is a graph of energy absorption of a rocker beam according to an embodiment of the present application.
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another, may refer to different or the same objects, and are not to be construed as indicating or implying relative importance. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
Example preparation of an aluminum alloy doorsill Beam
The preparation method of the aluminum alloy doorsill beam applied to the automobile comprises the following steps:
step 1: adding an aluminum ingot, a magnesium ingot, an aluminum-silicon intermediate alloy, a manganese agent, a chromium agent and an aluminum-50 copper intermediate alloy into a 30T aluminum smelting furnace; the molten aluminum obtained by smelting comprises the following components in percentage by weight: 0.762% Si, 0.127% Fe, 0.095% Cu, 0.582% Mg, 0.464% Mn, 0.013% Zn, 0.021% Ti, 0.081% Cr, and the balance of Al;
step 2: the aluminum liquid is filtered in two stages, and the mesh number of the filter plates is respectively 40 meshes and 60 meshes;
and step 3: performing semi-continuous casting by using a casting machine and a casting disc to cast a long aluminum bar with the length of 6 meters;
and 4, step 4: homogenizing in a 30T homogenizing furnace, keeping the temperature of 6H at 750 + -5 deg.C for 6 m long aluminum bar, and cooling with air mist. The tissue is detected by high power, the overburning phenomenon is avoided, and the quantity and the shape of the internal impurity phase meet the requirements. The grain size of the aluminum alloy is 60-80 microns;
and 5: sawing the long aluminum bar by using an aluminum bar sawing machine to obtain a 800mm short aluminum bar for extrusion;
step 6: the method comprises the following steps of extruding a short aluminum bar by using an aluminum extruder-2200T to obtain an aluminum alloy profile (namely, a threshold beam), wherein the threshold beam is of a structure in a shape like a Chinese character 'mu', the threshold beam comprises a first cavity unit 11, a second cavity unit 12 and a third cavity unit 13 which are sequentially connected and integrally formed, the first cavity unit 11 is a hollow isosceles trapezoid body, the second cavity unit 12 and the third cavity unit 13 are hollow cuboids, the lower bottom surface of the isosceles trapezoid body of the first cavity unit 11 is integrally connected to one surface of the second cavity unit 12, the thickness of the aluminum alloy profile is 4.5 +/-0.25 mm, and the aluminum alloy profile is quenched and cooled by adopting a fan;
and 7: and (3) adopting an aging process of 210 +/-5 ℃ and keeping the temperature for 4 hours in an aging furnace to convert the aluminum alloy section into a 6008T7 state.
And 8: the rocker beam prepared as described above is mounted between the B-pillar of the automobile and the battery pack provided at the bottom of the automobile body, as shown in fig. 2 to 3, 10 is the rocker beam, 20 is the B-pillar, and 30 is the battery pack. Each integrated threshold beam is transversely arranged at the middle-lower part of the front door and the rear door on the same side of the automobile body in a penetrating way.
The sill beam prepared in the above example was subjected to the following effect test:
effect example 1 maximum bending Angle test
Testing the equipment: a universal tensile testing machine;
the test method comprises the following steps: VDA-238-100-2010 Metal semifinished Material bending test.
The maximum bending angle test is carried out according to the bending angle test principle in fig. 4, wherein 1 in fig. 4 is a bending pressure head, 2 is a sample of an aluminum alloy section plate forming the doorsill beam, 3 is a bending axis, and 4 is an extrusion direction.
And (3) testing results: the maximum bending angle of the aluminum alloy section forming the sill beam of the present application after vertical extrusion is 85 ± 5 °.
Effect example 2 Crystal grain size test
Testing the equipment: inverting the metallographic microscope;
the test method comprises the following steps: GB/T3246.2-2012 deformed aluminum and aluminum alloy product structure inspection method 2: macrostructural examination methods.
And (3) testing results: FIG. 5 is a grain measurement of an aluminum alloy material according to an embodiment of the present application, wherein the grain size of the aluminum alloy comprising the rocker beam of the present application is 60-80 microns.
Effect example 3 mechanical Property test
Testing the equipment: a universal tensile testing machine;
the test method comprises the following steps: GB/T228 metal material room temperature tensile test method.
And (3) testing results: FIG. 6 is a graph showing the mechanical properties of the aluminum alloy material according to the embodiment of the present invention, and it can be seen from FIG. 6 that the tensile strength is RmNot less than 265MPa, yield strength Rp0.2260-320 MPa (the yield strength required in the standard is R)p0.2250 to 290MPa) and elongation of A50mm≥13％。
Effect example 4 energy absorption test
Testing the equipment: a universal tensile testing machine;
the test method comprises the following steps: and (5) carrying out a crushing test.
And (3) testing results: fig. 7 is a graph of energy absorption of a threshold beam according to an embodiment of the present application, the abscissa displacement (unit: mm) and the ordinate load (unit: kN) in fig. 7. The total absorbed energy is the area enclosed by the wave curve, the force and the displacement. I.e. the integral of the force and displacement is the total energy. The doorsill beam is gradually collapsed when being collided, the total absorbed energy is 30.0KJ-45.0KJ, the absorbed energy of the first cavity unit is 5-10KJ, the absorbed energy of the second cavity unit is 10-20KJ, and the absorbed energy of the third cavity unit is 15-25 KJ. The maximum bearing force of the threshold beam is 480 +/-10 KN, and the maximum bearing force is only a reference.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.
Claims (10)
1. The utility model provides an aluminum alloy doorsill beam for car, a serial communication port, the doorsill beam is "mesh" font structure, the doorsill beam is including connecting gradually and integrated into one piece's first die cavity unit, second die cavity unit and third die cavity unit, first die cavity unit is hollow isosceles trapezoid body, and second die cavity unit and third die cavity unit are hollow cuboid, isosceles trapezoid body's lower bottom surface integrated connection in the one side of second die cavity unit.
2. The aluminum alloy doorsill beam for automobiles as claimed in claim 1, wherein each of said doorsill beams is disposed between said battery pack and said B-pillar, the upper bottom surface of the isosceles trapezoid of said first cavity unit faces the B-pillar of said automobile door, the lower bottom surface of said isosceles trapezoid faces a side surface of the battery pack, and a doorsill beam is installed on each of the left and right sides of said battery pack.
3. The aluminum alloy doorsill beam for an automobile according to claim 1, wherein the doorsill beam is made of an aluminum alloy profile having a thickness of 4.5 ± 0.25 mm.
4. The aluminum alloy rocker beam for automobiles according to claim 3, wherein the maximum bending angle of the aluminum alloy section after vertical extrusion is 85 ± 5 °.
5. The aluminum alloy rocker beam for automobiles according to claim 1, wherein said aluminum alloy comprises the following composition in percentage by weight: 0.762% Si, 0.127% Fe, 0.095% Cu, 0.582% Mg, 0.464% Mn, 0.013% Zn, 0.021% Ti, 0.081% Cr, and the balance of Al.
6. The aluminum alloy rocker beam applied to automobiles of claim 5, wherein the aluminum alloy is prepared by an aging process of 210 +/-5 ℃ and is kept warm for 4 hours.
7. The aluminum alloy rocker beam for automobiles of claim 7, wherein the aluminum alloy has a designation of 6008T7 and a tensile strength of RmNot less than 265MPa, yield strength Rp0.2250 to 290MPa and elongation A50mm≥13％。
8. The aluminum alloy rocker beam for automotive applications as defined in claim 1, wherein said aluminum alloy has a grain size of 60-80 μm.
9. The aluminum alloy rocker beam for automobiles according to any one of claims 1 to 8, wherein the rocker beam is collapsed stepwise when being collided, the total absorbed energy is 30.0KJ to 45.0KJ, the first cavity unit absorbs energy at 5KJ to 10KJ, the second cavity unit absorbs energy at 10KJ to 20KJ, and the third cavity unit absorbs energy at 15 KJ to 25 KJ.
10. The aluminum alloy rocker beam for automotive applications as defined in claim 9, wherein said rocker beam has a maximum load bearing force of 480 ± 10 KN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111077313.3A CN113734296A (en) | 2021-09-14 | 2021-09-14 | Be applied to aluminum alloy threshold roof beam of car |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111077313.3A CN113734296A (en) | 2021-09-14 | 2021-09-14 | Be applied to aluminum alloy threshold roof beam of car |
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| CN202111077313.3A Pending CN113734296A (en) | 2021-09-14 | 2021-09-14 | Be applied to aluminum alloy threshold roof beam of car |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114558951A (en) * | 2022-01-17 | 2022-05-31 | 上海泽升汽车科技有限公司 | Forming method of aluminum alloy rear bumper for secondary energy absorption of automobile |
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| CN216185518U (en) * | 2021-09-14 | 2022-04-05 | 上海泽升汽车科技有限公司 | Be applied to aluminum alloy threshold roof beam of car |
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2021
- 2021-09-14 CN CN202111077313.3A patent/CN113734296A/en active Pending
Patent Citations (7)
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| JP2015116888A (en) * | 2013-12-17 | 2015-06-25 | マツダ株式会社 | Front part structure of vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114558951A (en) * | 2022-01-17 | 2022-05-31 | 上海泽升汽车科技有限公司 | Forming method of aluminum alloy rear bumper for secondary energy absorption of automobile |
| CN114558951B (en) * | 2022-01-17 | 2024-07-19 | 上海泽升汽车科技有限公司 | Forming method of aluminum alloy rear bumper for automobile secondary energy absorption |
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