CN111319577B - Energy-absorbing box with hydroforming structure - Google Patents
Energy-absorbing box with hydroforming structure Download PDFInfo
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- CN111319577B CN111319577B CN202010309174.1A CN202010309174A CN111319577B CN 111319577 B CN111319577 B CN 111319577B CN 202010309174 A CN202010309174 A CN 202010309174A CN 111319577 B CN111319577 B CN 111319577B
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- 238000010521 absorption reaction Methods 0.000 claims description 28
- 230000008859 change Effects 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 238000003466 welding Methods 0.000 description 11
- 239000000047 product Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
Abstract
The invention discloses a hydro-forming structure energy-absorbing box, which relates to the technical field of automobile part design and manufacture, wherein a main body of the energy-absorbing box is in a square cylinder shape with a closed section and symmetrical surface, the left end face and the right end face of the square cylinder shape are respectively a first end face and a second end face, the upper end face and the lower end face are respectively an upper end face and a lower end face, and the front end face and the rear end face are respectively an inner side face and an outer side face; the first end face and the second end face are both planes, the end faces of the upper end face and the lower end face are both provided with convex ribs which are convex upwards, the end faces of the inner side face and the outer side face are both provided with concave ribs which are concave inwards, and the intersections of the upper end face and the lower end face with the inner side face and the outer side face are both in a round corner guiding structure. The cross section of the energy-absorbing box provided by the invention is of a closed structure and is manufactured by adopting a hydroforming process, so that the manufacturing cost of the energy-absorbing box can be reduced, the product performance can be improved, and the weight can be reduced.
Description
Technical Field
The invention relates to the technical field of automobile part design and manufacture, in particular to a bumper collision energy-absorbing box, and especially relates to a hydro-forming structure energy-absorbing box.
Background
The automobile energy absorption box is one of important component parts of the bumper assembly, is arranged between a longitudinal beam of a vehicle body and a bumper beam, and is used for connecting the bumper beam and the longitudinal beam and supporting the beam. When an automobile collides, the energy of the collision is absorbed, and the impact of the collision on the longitudinal beam of the automobile body is buffered.
At present, most bumper energy-absorbing boxes of automobiles adopt two U-shaped stamping parts which are connected through dioxygenwelding or spot welding to form a cavity structure, as shown in figure 1. Although the function of collision energy absorption can be realized, the investment of the stamping die and the welding clamp is larger (the cost is higher), the waste of the sheet metal blank is serious (the material utilization rate is lower), and the strength of the welding line is higher, so that the welding line is broken nearby the welding line during collision, and the energy absorption effect is poor.
Disclosure of Invention
The invention aims to overcome the defects of the existing energy-absorbing box structure and manufacturing technology, and provides an energy-absorbing box with a closed cross section and manufactured by adopting a hydroforming process.
The invention is realized by the following technical scheme:
the energy-absorbing box with the hydroforming structure is characterized in that the energy-absorbing box main body 1 is in a square cylinder shape with a closed section and symmetrical surface, the left end face and the right end face of the square cylinder shape are respectively a first end face 11 and a second end face 12, the upper end face and the lower end face are respectively an upper end face 13 and a lower end face 14, and the front end face and the rear end face are respectively an inner side face 16 and an outer side face 17; the first end face 11 and the second end face 12 are both planes, the end faces of the upper end face 13 and the lower end face 14 are both provided with convex ribs 15 protruding upwards, the end faces of the inner side face 16 and the outer side face 17 are both provided with concave ribs 18 recessed inwards, and the intersections of the upper end face 13 and the lower end face 14 with the inner side face 16 and the outer side face 17 are both in a rounded corner structure.
Further, the change rate of the perimeter of the section of the energy-absorbing box main body 1 along the axis 2 is not more than 5%; the section perimeter change rate eta refers to the change degree of the section perimeter of the energy-absorbing box main body 1 along the axis, and the maximum section perimeter change rate is expressed by the percentage and can be calculated by the following formula:
wherein: cmax is the maximum cross-sectional perimeter and Cmin is the minimum cross-sectional perimeter.
Further, the first end face 11 is connected with a bumper beam, and the first end face 11 is not perpendicular to the energy absorption box axis 2 according to the shape of the bumper beam; the second end face 12 is connected with a longitudinal beam of the vehicle body, and the second end face 12 is perpendicular to the axis 2 of the energy absorption box.
Further, the cross sections of the ribs 15 on the upper end face 13 and the lower end face 14 are parabolic or arc, the contact parts between the ribs and the upper end face 13 and the lower end face 14 adopt round corners r1, and the r1 value is more than 2 times of the part wall thickness, namely, r1 is more than 2t; the plane of the center line of the convex rib 15 near the first end surface 11 is parallel to the first end surface 11, and the plane of the center line of the convex rib 15 near the second end surface 12 is parallel to the second end surface 12; the number of the ribs 15 can be set according to the characteristics and the size of the energy absorption box product.
Further, the concave ribs 18 on the inner side surface 16 and the outer side surface 17 penetrate through the plane of the side surface where the concave ribs are located, the section is parabolic or circular arc, a rounded corner r2 is adopted at the contact part with the side surface where the concave ribs are located, and the r2 value is more than 3 times of the part wall thickness, namely, r2 is more than 3t; the plane of the center line of the concave rib 1 near the first end surface 11 is parallel to the first end surface 11, and the plane of the center line of the concave rib 18 near the second end surface 12 is parallel to the second end surface 12. The number of the concave ribs 18 can be set according to the characteristics and the size of the energy absorption box product.
Further, the depth of the concave ribs 18 decreases or at least does not increase in sequence along the direction from the first end face 11 to the second end face 12, that is, h1 is greater than or equal to h2 is greater than or equal to h3.
Further, the number of the convex ribs 15 and the concave ribs 18 on two adjacent surfaces is the same, and the convex ribs 15 and the concave ribs 18 at corresponding positions on four planes of the energy-absorbing box 1 are on the same plane.
Further, the fillet R at the intersection of the upper and lower end surfaces 13, 14 with the inner and outer side surfaces 16, 17 should have a value greater than 5 times the part wall thickness, i.e. R > 5t.
The manufacturing process of the energy absorption box with the hydroformed structure is as follows:
(1) And (3) blank: a tubular metal blank;
(2) And (3) hydroforming: and (3) placing the tube blank into a lower die, closing an upper die and a lower die, sealing the tube blank through linear movement of a left horizontal punch die and a right horizontal punch die, and then injecting a high-pressure liquid medium into the tube blank to realize plastic deformation of the tube blank until the tube blank is completely attached to a die cavity of the die, and finishing forming.
Depending on the size and equipment specifications of the crash box 1, a plurality of parts can be formed at one time, and the first end face 11 and the second end face 12 of the crash box are both planes, so that the crash box can be realized by adopting a saw or a die during separation.
The working principle and the using process of the invention are as follows:
when the front collision of the automobile occurs, the strength of the bumper beam is high, and plastic deformation or small plastic deformation amount does not occur at the beginning, but force is transmitted to the energy absorption box 1. According to the structural characteristics of the energy-absorbing box 1, the depth of the concave ribs 18 on the two sides of the inner part 16 and the outer part 17, which are close to the first end face 11, is the largest, so that the position is firstly subjected to crumple deformation, and is sequentially transferred to the direction of the second end face 12 until the position is completely crumpled. If the energy generated by the collision is completely absorbed by the energy absorption box 1 at the moment, the longitudinal beam of the vehicle body is not deformed; if the energy generated by the collision is not fully absorbed, the body side member and the bumper beam will deform until the energy is fully absorbed.
Compared with the prior art, the invention has the following advantages:
the hydraulic forming process of the tube blank is adopted, so that the investment of a stamping die and a welding clamp is reduced, the utilization rate of the tube blank material is improved, and the manufacturing cost of the energy absorption box part is reduced by 1.5%; proved by product tests, compared with the original stamping and welding structure, the energy absorption effect of the energy absorption box is increased by 6.8%; because the energy-absorbing box is of a closed structure along the axis and has no welding lap joint structure, the mass of the energy-absorbing box assembly is reduced by 3.03%, and if the product performance (energy-absorbing effect) is ensured to be the same, the further weight reduction can be realized by reducing the thickness of the tube blank.
Drawings
FIG. 1 is a schematic diagram of an original stamped and welded structure of an energy absorber box;
FIG. 2 is a schematic illustration of a hydroformed crash box according to the present invention;
FIG. 3 is a top view of the inventive crash box;
FIG. 4 is a schematic view of a structure of two crash boxes formed at a time using the method of the present invention;
in the figure: the energy-absorbing box comprises an energy-absorbing box main body 1, an energy-absorbing box axis 2, a first end face 11, a second end face 12, an upper end face 13, a lower end face 14, convex ribs 15, an inner side face 16, an outer side face 17 and concave ribs 18.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Example 1
As shown in fig. 2, a crash box with a hydroformed structure is shown in the specification, wherein a crash box main body 1 is in a square cylinder shape with a closed section and symmetrical surface, a left end face and a right end face of the square cylinder shape are respectively a first end face 11 and a second end face 12, an upper end face 13 and a lower end face 14 are respectively arranged on the upper end face and the lower end face, and an inner side face 16 and an outer side face 17 are respectively arranged on the front end face and the rear end face; the first end face 11 and the second end face 12 are both planes, the end faces of the upper end face 13 and the lower end face 14 are both provided with convex ribs 15 protruding upwards, the end faces of the inner side face 16 and the outer side face 17 are both provided with concave ribs 18 recessed inwards, and the intersections of the upper end face 13 and the lower end face 14 with the inner side face 16 and the outer side face 17 are both in a rounded corner structure.
The change rate of the perimeter of the section of the energy absorption box main body 1 along the axis 2 is not more than 5%; the section perimeter change rate eta refers to the change degree of the section perimeter of the energy-absorbing box main body 1 along the axis, and the maximum section perimeter change rate is expressed by the percentage and can be calculated by the following formula:
wherein: cmax is the maximum cross-sectional perimeter and Cmin is the minimum cross-sectional perimeter.
The first end face 11 is connected with the bumper beam, and the first end face 11 is not perpendicular to the energy absorption box axis 2 according to the shape of the bumper beam; the second end face 12 is connected with a longitudinal beam of the vehicle body, and the second end face 12 is perpendicular to the axis 2 of the energy absorption box.
The cross sections of the convex ribs 15 on the upper end face 13 and the lower end face 14 are parabolic or arc, the contact parts between the convex ribs and the upper end face 13 and the lower end face 14 adopt round corners r1, and the r1 value is more than 2 times of the whole wall thickness of the energy absorption box part, namely, r1 is more than 2t; the plane of the center line of the convex rib 15 near the first end surface 11 is parallel to the first end surface 11, and the plane of the center line of the convex rib 15 near the second end surface 12 is parallel to the second end surface 12; the number of the ribs 15 can be set according to the characteristics and the size of the energy absorption box product.
Concave ribs 18 on the inner side surface 16 and the outer side surface 17 penetrate through the plane of the side surface, the section is parabolic or circular arc, a part wall thickness with a r2 value of more than 3 times of a rounded corner is adopted at the contact part with the side surface, namely, r2 is more than 3t; the plane of the center line of the concave rib 1 near the first end surface 11 is parallel to the first end surface 11, and the plane of the center line of the concave rib 18 near the second end surface 12 is parallel to the second end surface 12. The number of the concave ribs 18 can be set according to the characteristics and the size of the energy absorption box product.
The depth of the concave ribs 18 decreases or at least does not increase in sequence along the direction from the first end face 11 to the second end face 12, namely, h1 is more than or equal to h2 is more than or equal to h3.
The number of the convex ribs 15 and the concave ribs 18 on two adjacent surfaces is the same, and the convex ribs 15 and the concave ribs 18 at corresponding positions on four planes of the energy-absorbing box 1 are on the same plane.
The fillet R at the intersection of the upper end face 13 and the lower end face 14 with the inner side face 16 and the outer side face 17 should have a R value greater than 5 times the wall thickness of the part, i.e. R > 5t.
The manufacturing process of the energy absorption box with the hydroformed structure is as follows:
(1) And (3) blank: a tubular metal blank;
(2) And (3) hydroforming: and (3) placing the tube blank into a lower die, closing an upper die and a lower die, sealing the tube blank through linear movement of a left horizontal punch die and a right horizontal punch die, and then injecting a high-pressure liquid medium into the tube blank to realize plastic deformation of the tube blank until the tube blank is completely attached to a die cavity of the die, and finishing forming.
Depending on the size and equipment specifications of the crash box 1, a plurality of parts can be formed at one time, and the first end face 11 and the second end face 12 of the crash box are both planes, so that the crash box can be realized by adopting a saw or a die during separation.
The working principle and the using process of the invention are as follows:
when the front collision of the automobile occurs, the strength of the bumper beam is high, and plastic deformation or small plastic deformation amount does not occur at the beginning, but force is transmitted to the energy absorption box 1. According to the structural characteristics of the energy-absorbing box 1, the depth of the concave ribs 18 on the two sides of the inner part 16 and the outer part 17, which are close to the first end face 11, is the largest, so that the position is firstly subjected to crumple deformation, and is sequentially transferred to the direction of the second end face 12 until the position is completely crumpled. If the energy generated by the collision is completely absorbed by the energy absorption box 1 at the moment, the longitudinal beam of the vehicle body is not deformed; if the energy generated by the collision is not fully absorbed, the body side member and the bumper beam will deform until the energy is fully absorbed.
By adopting the energy-absorbing box with the structure, the investment of a stamping die and a welding clamp is reduced, the utilization rate of a tube blank material is improved, and the manufacturing cost of the parts of the energy-absorbing box is reduced by 1.5%; proved by product tests, compared with the original stamping and welding structure, the energy absorption effect of the energy absorption box is increased by 6.8%; because the energy-absorbing box is of a closed structure along the axis and has no welding lap joint structure, the mass of the energy-absorbing box assembly is reduced by 3.03%, and if the product performance (energy-absorbing effect) is ensured to be the same, the further weight reduction can be realized by reducing the thickness of the tube blank.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (5)
1. The energy-absorbing box with the hydroformed structure is characterized in that the energy-absorbing box main body (1) is in a square cylinder shape with a closed section and symmetrical surface, the left end face and the right end face of the square cylinder shape are respectively a first end face (11) and a second end face (12), the upper end face and the lower end face are respectively an upper end face (13) and a lower end face (14), and the front end face and the rear end face are respectively an inner side face (16) and an outer side face (17); the first end face (11) and the second end face (12) are both planes, the end faces of the upper end face (13) and the lower end face (14) are provided with convex ribs (15) which are upwards convex, the end faces of the inner side face (16) and the outer side face (17) are provided with concave ribs (18) which are inwards concave, and the intersection parts of the upper end face (13) and the lower end face (14) with the inner side face (16) and the outer side face (17) adopt round corner guiding structures;
the perimeter change rate of the section of the energy absorption box main body (1) along the axis (2) is not more than 5%; the section perimeter change rate eta refers to the change degree of the section perimeter of the energy-absorbing box main body (1) along the axis, and the maximum section perimeter change rate is expressed by percentage and can be calculated by the following formula:
wherein: cmax is the maximum cross-sectional perimeter and Cmin is the minimum cross-sectional perimeter;
concave ribs (18) on the inner side surface (16) and the outer side surface (17) penetrate through the plane of the side surface where the concave ribs are located, the section is parabolic or circular arc, a part wall thickness with a radius r2 and a r2 value being more than 3 times is adopted at the contact part of the concave ribs and the side surface where the concave ribs are located, namely, the r2 is more than 3t; the plane of the center line of the concave rib (18) close to the first end surface (11) is parallel to the first end surface (11), and the plane of the center line of the concave rib (18) close to the second end surface (12) is parallel to the second end surface (12);
convex ribs (15) on the upper end face (13) and the lower end face (14) are parabolic or circular arc in section, and the contact parts between the convex ribs and the upper end face (13) and the lower end face (14) adopt a round guiding angle r1, wherein the r1 value is more than 2 times of the part wall thickness, namely r1 is more than 2t; the plane of the center line of the convex rib (15) close to the first end face (11) is parallel to the first end face (11), and the plane of the center line of the convex rib (15) close to the second end face (12) is parallel to the second end face (12).
2. A hydroformed crash box according to claim 1, characterized in that the first end face (11) is connected to a bumper beam, the first end face (11) being non-perpendicular to the crash box axis (2) depending on the shape of the bumper beam; the second end face (12) is connected with a longitudinal beam of the vehicle body, and the second end face (12) is perpendicular to the axis (2) of the energy absorption box.
3. A hydroformed crash box according to claim 1, characterized in that the depth of the ribs (18) decreases or at least does not increase in sequence in the direction from the first end face (11) to the second end face (12), i.e. h1 is greater than or equal to h2 is greater than or equal to h3.
4. The energy absorption box with the hydroformed structure according to claim 1, wherein the number of the convex ribs (15) and the concave ribs (18) on two adjacent surfaces is the same, and the convex ribs (15) and the concave ribs (18) at corresponding positions on four planes of the energy absorption box main body (1) are on the same plane.
5. A hydroformed crash box according to claim 1, characterized in that the fillet R at the intersection of the upper and lower end surfaces (13, 14) with the inner and outer side surfaces (16, 17) has a value R which is greater than 5 times the wall thickness of the part, i.e. R > 5t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010309174.1A CN111319577B (en) | 2020-04-20 | 2020-04-20 | Energy-absorbing box with hydroforming structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010309174.1A CN111319577B (en) | 2020-04-20 | 2020-04-20 | Energy-absorbing box with hydroforming structure |
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| Publication Number | Publication Date |
|---|---|
| CN111319577A CN111319577A (en) | 2020-06-23 |
| CN111319577B true CN111319577B (en) | 2024-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010309174.1A Active CN111319577B (en) | 2020-04-20 | 2020-04-20 | Energy-absorbing box with hydroforming structure |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115257931A (en) * | 2022-07-14 | 2022-11-01 | 一汽奔腾轿车有限公司 | Integrated cross-shaped inner high-pressure forming energy absorption box structure of auxiliary frame of electric vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962038A (en) * | 2010-10-19 | 2011-02-02 | 凌云工业股份有限公司 | Minicar impact-proof beam energy absorption box capable of controlling impact energy absorption and residual deformation |
| CN201923216U (en) * | 2010-11-25 | 2011-08-10 | 浙江吉利汽车研究院有限公司 | Automobile energy absorbing box |
| WO2014030592A1 (en) * | 2012-08-21 | 2014-02-27 | 新日鐵住金株式会社 | Crash box and automobile body |
| CN204821427U (en) * | 2015-07-20 | 2015-12-02 | 北京汽车股份有限公司 | Energy -absorbing box and car |
| CN206938686U (en) * | 2017-03-27 | 2018-01-30 | 宝山钢铁股份有限公司 | A kind of front anti-collision beam energy absorbing box |
-
2020
- 2020-04-20 CN CN202010309174.1A patent/CN111319577B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962038A (en) * | 2010-10-19 | 2011-02-02 | 凌云工业股份有限公司 | Minicar impact-proof beam energy absorption box capable of controlling impact energy absorption and residual deformation |
| CN201923216U (en) * | 2010-11-25 | 2011-08-10 | 浙江吉利汽车研究院有限公司 | Automobile energy absorbing box |
| WO2014030592A1 (en) * | 2012-08-21 | 2014-02-27 | 新日鐵住金株式会社 | Crash box and automobile body |
| CN204821427U (en) * | 2015-07-20 | 2015-12-02 | 北京汽车股份有限公司 | Energy -absorbing box and car |
| CN206938686U (en) * | 2017-03-27 | 2018-01-30 | 宝山钢铁股份有限公司 | A kind of front anti-collision beam energy absorbing box |
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| CN111319577A (en) | 2020-06-23 |
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