CN111319577A - Energy absorption box with hydraulic forming structure - Google Patents
Energy absorption box with hydraulic forming structure Download PDFInfo
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- CN111319577A CN111319577A CN202010309174.1A CN202010309174A CN111319577A CN 111319577 A CN111319577 A CN 111319577A CN 202010309174 A CN202010309174 A CN 202010309174A CN 111319577 A CN111319577 A CN 111319577A
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 62
- 210000003205 muscle Anatomy 0.000 claims 2
- 230000007423 decrease Effects 0.000 claims 1
- 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
- 239000013585 weight reducing agent Substances 0.000 abstract description 3
- 238000003466 welding Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
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- 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
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Abstract
The invention discloses an energy absorption box with a hydraulic forming structure, which relates to the technical field of design and manufacture of automobile parts.A main body of the energy absorption box is in a square cylinder shape with a closed section and a symmetrical surface, the left end surface and the right end surface of the square cylinder shape are respectively a first end surface and a second end surface, the upper end surface and the lower end surface are respectively an upper end surface and a lower end surface, and the front end surface and the rear end surface are respectively an inner side surface and an outer side surface; the first end face and the second end face are both planes, convex ribs protruding upwards are arranged on the end faces of the upper end face and the lower end face, concave ribs protruding inwards are arranged on the end faces of the inner side face and the outer side face, and the intersection positions of the upper end face and the lower end face with the inner side face and the outer side face are of rounded corner structures. The section of the energy absorption box provided by the invention is of a closed structure, and the energy absorption box is produced and manufactured by adopting a hydroforming process, so that the energy absorption box with the structure not only can realize the reduction of the manufacturing cost and the improvement of the product performance, but also can realize the weight reduction.
Description
Technical Field
The invention relates to the technical field of design and manufacture of automobile parts, in particular to a bumper collision energy absorption box, and particularly relates to an energy absorption box with a hydraulic forming structure.
Background
The automobile energy absorption box is one of important component parts of a bumper assembly, and is arranged between a vehicle body longitudinal beam and a bumper beam to realize connection between the bumper beam and the longitudinal beam and support of the beam. When the automobile collides, the energy of the collision is absorbed, and the impact of the collision on the body longitudinal beam is buffered.
At present, most bumper energy absorption boxes of automobiles adopt two U-shaped stamping parts which are connected through welding with oxygen or spot welding to form a cavity structure, and the structure is shown in figure 1. Although the function of collision energy absorption can be realized, the investment of a stamping die and a welding clamp is large (the cost is high), the waste of a sheet metal blank is serious (the material utilization rate is low), the strength of a welding line is high, the sheet metal blank is broken near the welding line when in collision, and the energy absorption effect is poor.
Disclosure of Invention
The invention aims to provide an energy-absorbing box with a closed section and produced by adopting a hydroforming process aiming at the defects of the structure and the manufacturing technology of the existing energy-absorbing box.
The invention is realized by the following technical scheme:
a body 1 of the energy absorption box is in a square cylinder shape with a closed section and a symmetrical surface, the left end surface and the right end surface of the square cylinder shape are respectively a first end surface 11 and a second end surface 12, the upper end surface and the lower end surface are respectively an upper end surface 13 and a lower end surface 14, and the front end surface and the rear end surface are respectively an inner side surface 16 and an outer side surface 17; the first end face 11 and the second end face 12 are both planes, convex ribs 15 protruding upwards are arranged on the end faces of the upper end face 13 and the lower end face 14, concave ribs 18 recessed inwards are arranged on the end faces of the inner side face 16 and the outer side face 17, and the intersection positions of the upper end face 13 and the lower end face 14 and the inner side face 16 and the outer side face 17 adopt rounded corner structures.
Further, the change rate of the perimeter of the section of the crash box main body 1 along the axis 2 is not more than 5%, the change rate of the perimeter of the section η refers to the change degree of the perimeter of the section of the crash box main body 1 along the axis, and is expressed by percentage, and the maximum change rate of the perimeter of the section can be calculated by the following formula:
in the formula: 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 according to the shape of the bumper beam, the first end face 11 is not perpendicular to the energy absorption box axis 2; the second end face 12 is connected with a vehicle body longitudinal beam, and the second end face 12 is perpendicular to the axis 2 of the energy absorption box.
Furthermore, the section of each rib 15 on the upper end surface 13 and the lower end surface 14 is in a parabolic shape or an arc shape, the contact part of each rib with the upper end surface 13 and the lower end surface 14 adopts a fillet r1, and the value of r1 is more than 2 times of the wall thickness of the part, namely r1 is more than 2 t; the plane of the center line of the convex rib 15 close to the first end surface 11 side is parallel to the first end surface 11, and the plane of the center line of the convex rib 15 close to the second end surface 12 side is parallel to the second end surface 12; the number of ribs 15 can be set according to the characteristics and dimensions of the crash box product.
Furthermore, the concave ribs 18 on the inner side surface 16 and the outer side surface 17 penetrate through the plane of the side surface, the cross section of each concave rib is in a parabola shape or an arc shape, the contact part of each concave rib and the plane of the side surface is provided with a fillet r2, the r2 value is more than 3 times of the wall thickness of the part, namely r2 is more than 3 t; the plane of the central line of the concave rib 1 close to the first end surface 11 side is parallel to the first end surface 11, and the plane of the central line of the concave rib 18 close to the second end surface 12 side is parallel to the second end surface 12. The number of ribs 18 can be set according to the characteristics and dimensions of the crash box product.
Furthermore, the depth of the concave ribs 18 is gradually decreased or at least not increased along the direction from the first end surface 11 to the second end surface 12, namely h1 is more than or equal to h2 is more than or equal to h 3.
Furthermore, 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 on the corresponding positions on the four planes of the energy absorption box 1 are on the same plane.
Further, the rounding angles R at the intersections of the upper end surface 13 and the lower end surface 14 with the inner side surface 16 and the outer side surface 17 should be larger than 5 times of the wall thickness of the part, i.e., R > 5 t.
The manufacturing process of the energy absorption box with the hydraulic forming structure comprises the following steps:
(1) and blank material: a tubular metal blank;
(2) and hydroforming: the tube blank is placed in the lower die, the upper die and the lower die are closed, the tube blank is sealed through the linear motion of the left horizontal punch die and the right horizontal punch die, then high-pressure liquid medium is injected into the tube blank to realize the plastic deformation of the tube blank until the tube blank is completely attached to the die cavity, and the forming is finished.
According to the size and the equipment specification of the energy absorption box 1, a plurality of parts can be formed at one time, and because the first end surface 11 and the second end surface 12 of the energy absorption box are both flat surfaces, the separation can be realized by a saw or a die.
The working principle and the using process of the invention are as follows:
when the front and rear frontal collisions occur in the automobile, the bumper beam has high strength, so that the bumper beam does not deform plastically or deforms less plastically at the beginning, but transmits force to the energy absorption box 1. According to the structural characteristics of the energy absorption box 1, the depth of the concave ribs 18 on the two sides of the inner side 16 and the outer side 17 close to the first end face 11 is the largest, so that the position is firstly subjected to collapse deformation and is sequentially transmitted to the direction of the second end face 12 until the position is completely crushed. If the energy generated by the collision is completely absorbed by the energy absorption box 1, the vehicle body longitudinal beam does not deform; if the energy generated by the collision is not completely absorbed, the body side rails and the bumper beam will deform until the energy is completely absorbed.
Compared with the prior art, the invention has the following advantages:
by adopting a tube blank hydraulic forming process, the investment of a stamping die and a welding clamp is reduced, the utilization rate of tube blank materials is improved, and the manufacturing cost of the energy absorption box part is reduced by 1.5%; product tests prove that compared with the original stamping and welding structure, the energy absorption box with the structure has the advantage that the energy absorption effect is increased by 6.8%; because the energy absorption box is of a closed structure along the axis and has no welding lap joint structure, the mass of the energy absorption box assembly is reduced by 3.03 percent, and if the product performance (energy absorption 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 structural view of an energy absorption box of an original stamping and welding structure;
FIG. 2 is a schematic structural view of a hydroformed structural crash box in accordance with the present invention;
FIG. 3 is a top view of a structural crash box of the present invention;
FIG. 4 is a schematic structural view of a method of the present invention for forming two crash boxes at a time;
in the figure: the energy absorption box comprises an energy absorption box main body 1, an energy absorption box axis 2, a first end face 11, a second end face 12, an upper end face 13, a lower end face 14, a convex rib 15, an inner side face 16, an outer side face 17 and a concave rib 18.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example 1
As shown in FIG. 2, the energy absorption box with a hydraulic forming structure has a main body 1 in a square cylinder shape with a closed cross section and a symmetrical plane, wherein the left end surface and the right end surface of the square cylinder shape are respectively a first end surface 11 and a second end surface 12, the upper end surface and the lower end surface are respectively an upper end surface 13 and a lower end surface 14, and the front end surface and the rear end surface are respectively an inner side surface 16 and an outer side surface 17; the first end face 11 and the second end face 12 are both planes, convex ribs 15 protruding upwards are arranged on the end faces of the upper end face 13 and the lower end face 14, concave ribs 18 recessed inwards are arranged on the end faces of the inner side face 16 and the outer side face 17, and the intersection positions of the upper end face 13 and the lower end face 14 and the inner side face 16 and the outer side face 17 adopt rounded corner structures.
The change rate of the perimeter of the section of the crash box main body 1 along the axis 2 is not more than 5 percent, the change rate of the perimeter of the section is η, the change rate of the perimeter of the section of the crash box main body 1 along the axis is represented by percentage, and the maximum change rate of the perimeter of the section can be calculated by the following formula:
in the formula: 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 according to the shape of the bumper beam, the first end face 11 is not perpendicular to the axis 2 of the energy absorption box; the second end face 12 is connected with a vehicle body longitudinal beam, and the second end face 12 is perpendicular to the axis 2 of the energy absorption box.
The sections of the convex ribs 15 on the upper end surface 13 and the lower end surface 14 are in a parabolic shape or an arc shape, the contact parts of the convex ribs and the lower end surface 14 with the upper end surface 13 adopt fillet guide r1, and the r1 value is more than 2 times of the integral wall thickness of the energy absorption box part, namely r1 is more than 2 t; the plane of the center line of the convex rib 15 close to the first end surface 11 side is parallel to the first end surface 11, and the plane of the center line of the convex rib 15 close to the second end surface 12 side is parallel to the second end surface 12; the number of ribs 15 can be set according to the characteristics and dimensions of the crash box product.
The concave ribs 18 on the inner side surface 16 and the outer side surface 17 penetrate through the plane of the side surface, the cross sections of the concave ribs are in a parabolic shape or an arc shape, a fillet r2 is adopted at the contact part of the concave ribs and the plane of the side surface, the value of r2 is more than 3 times of the wall thickness of the part, namely r2 is more than 3 t; the plane of the central line of the concave rib 1 close to the first end surface 11 side is parallel to the first end surface 11, and the plane of the central line of the concave rib 18 close to the second end surface 12 side is parallel to the second end surface 12. The number of ribs 18 can be set according to the characteristics and dimensions of the crash box product.
The depth of the concave ribs 18 is gradually reduced or at least not increased along the direction from the first end surface 11 to the second end surface 12, namely h1 is more than or equal to h2 is more than or equal to h 3.
The quantity of the convex ribs 15 and the quantity of the concave ribs 18 on two adjacent surfaces are the same, and the convex ribs 15 and the concave ribs 18 on the corresponding positions on the four planes of the energy absorption box 1 are on the same plane.
And the rounding angles R at the intersections of the upper end surface 13 and the lower end surface 14 and the inner side surface 16 and the outer side surface 17 have the value of more than 5 times of the wall thickness of the part, namely R is more than 5 t.
The manufacturing process of the energy absorption box with the hydraulic forming structure comprises the following steps:
(1) and blank material: a tubular metal blank;
(2) and hydroforming: the tube blank is placed in the lower die, the upper die and the lower die are closed, the tube blank is sealed through the linear motion of the left horizontal punch die and the right horizontal punch die, then high-pressure liquid medium is injected into the tube blank to realize the plastic deformation of the tube blank until the tube blank is completely attached to the die cavity, and the forming is finished.
According to the size and the equipment specification of the energy absorption box 1, a plurality of parts can be formed at one time, and because the first end surface 11 and the second end surface 12 of the energy absorption box are both flat surfaces, the separation can be realized by a saw or a die.
The working principle and the using process of the invention are as follows:
when the front and rear frontal collisions occur in the automobile, the bumper beam has high strength, so that the bumper beam does not deform plastically or deforms less plastically at the beginning, but transmits force to the energy absorption box 1. According to the structural characteristics of the energy absorption box 1, the depth of the concave ribs 18 on the two sides of the inner side 16 and the outer side 17 close to the first end face 11 is the largest, so that the position is firstly subjected to collapse deformation and is sequentially transmitted to the direction of the second end face 12 until the position is completely crushed. If the energy generated by the collision is completely absorbed by the energy absorption box 1, the vehicle body longitudinal beam does not deform; if the energy generated by the collision is not completely absorbed, the body side rails and the bumper beam will deform until the energy is completely absorbed.
By adopting the energy absorption 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 energy absorption box part is reduced by 1.5%; product tests prove that compared with the original stamping and welding structure, the energy absorption box with the structure has the advantage that the energy absorption effect is increased by 6.8%; because the energy absorption box is of a closed structure along the axis and has no welding lap joint structure, the mass of the energy absorption box assembly is reduced by 3.03 percent, and if the product performance (energy absorption 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 with reference to the accompanying drawings, however, 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 technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (8)
1. The energy absorption box with the hydraulic forming structure is characterized in that a main body (1) of the energy absorption box is in a square cylinder shape with a closed section and a symmetrical surface, the left end surface and the right end surface of the square cylinder shape are respectively a first end surface (11) and a second end surface (12), the upper end surface and the lower end surface are respectively an upper end surface (13) and a lower end surface (14), and the front end surface and the rear end surface are respectively an inner side surface (16) and an outer side surface (17); first terminal surface (11) and second terminal surface (12) are the plane, all have protruding muscle (15) that make progress on the terminal surface of up end (13) and lower terminal surface (14), all there is inside sunken concave muscle (18) on the terminal surface of medial surface (16) and lateral surface (17), up end (13) and lower terminal surface (14) with medial surface (16) and the crossing department of lateral surface (17) all adopt the lead fillet structure.
2. A hydroformable structural crash box according to claim 1, wherein said crash box body (1) has a cross-sectional perimeter variation along said axis (2) of no more than 5%, said cross-sectional perimeter variation η being the degree of variation in cross-sectional perimeter of said crash box body (1) along said axis, expressed as a percentage, and the maximum cross-sectional perimeter variation being calculated by the formula:
in the formula: cmax is the maximum cross-sectional perimeter and Cmin is the minimum cross-sectional perimeter.
3. A hydroformed structural energy absorption 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 energy absorption box axis (2) depending on the shape of the bumper beam; the second end face (12) is connected with a vehicle body longitudinal beam, and the second end face (12) is perpendicular to the energy absorption box axis (2).
4. The energy absorption box with the hydroformed structure according to claim 1, wherein the ribs (15) on the upper end face (13) and the lower end face (14) have a parabolic or circular-arc cross section, and contact parts with the upper end face (13) and the lower end face (14) adopt fillet r1, wherein the r1 value is more than 2 times of the wall thickness of the part, namely r1 is more than 2 t; the plane of the center line of the convex rib (15) close to the first end surface (11) side is parallel to the first end surface (11), and the plane of the center line of the convex rib (15) close to the second end surface (12) side is parallel to the second end surface (12).
5. The energy absorption box with a hydroformed structure according to claim 1, characterized in that the concave ribs (18) on the inner side (16) and the outer side (17) penetrate the plane of the side, the cross section of the concave ribs is parabolic or circular arc, and the contact part of the concave ribs and the plane of the side adopts a fillet r2, wherein the value of r2 is more than 3 times of the wall thickness of the part, namely r2 is more than 3 t; the plane of the central line of the concave rib (1) close to the first end face (11) is parallel to the first end face (11), and the plane of the central line of the concave rib (18) close to the second end face (12) is parallel to the second end face (12).
6. A hydroformable structural energy absorption box according to claim 1, wherein the depth of the ribs (18) decreases or at least does not increase in the direction from the first end face (11) to the second end face (12), i.e. h1 ≧ h2 ≧ h 3.
7. A hydroformable structural energy absorption box according to claim 1, wherein the ribs (15) and the grooves (18) are of the same number on two adjacent faces, and the ribs (15) and the grooves (18) at corresponding positions on four planes of the energy absorption box (1) are on the same plane.
8. A hydroformable structural energy absorption box according to claim 1, wherein the rounded corners R at the intersection of said upper (13) and lower (14) end faces with said inner (16) and outer (17) side faces have a value greater than 5 times the wall thickness of the part, i.e. R > 5 t.
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 |
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| 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 |
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| CN111319577A true CN111319577A (en) | 2020-06-23 |
| CN111319577B CN111319577B (en) | 2024-03-19 |
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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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Cited By (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 |
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| 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 |
Cited By (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 |
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| CN111319577B (en) | 2024-03-19 |
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