CN104249759A - Automobile rear longitudinal beam structure and manufacturing method - Google Patents
Automobile rear longitudinal beam structure and manufacturing method Download PDFInfo
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- CN104249759A CN104249759A CN201310265192.4A CN201310265192A CN104249759A CN 104249759 A CN104249759 A CN 104249759A CN 201310265192 A CN201310265192 A CN 201310265192A CN 104249759 A CN104249759 A CN 104249759A
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Abstract
The embodiment of the invention discloses an automobile rear longitudinal beam structure. The automobile rear longitudinal beam structure at least is provided with a straight beam segment. The straight beam segment is of a metal thin-wall structure. The first thickness is adopted as the thickness of a thin wall of the backmost end of a rear longitudinal beam; the second thickness is adopted as the thickness of a thin wall of the most front end of the rear longitudinal beam; the second thickness is larger than the first thickness; at least one area is arranged on the rear longitudinal beam; the thickness of the thin wall is continuously changed to the first thickness from the second thickness. The embodiment of the invention further provides a manufacturing method of the automobile rear longitudinal beam. According to the automobile rear longitudinal beam structure and the manufacturing method of the automobile rear longitudinal beam structure, the structural lightweight aim of the rear longitudinal beam of an automobile body is achieved, and meanwhile the structural strength and the structural energy absorption efficiency of the rear longitudinal beam are improved.
Description
Technical field
The invention belongs to body structure field, particularly relate to a kind of automobile rear longitudinal girder structure and manufacture method.
Background technology
In front portion of car body keystone configuration, floor side member is one of most important power-absorbing.In collision process below, absorb impact kinetic energy by the plastic deformation of material, its energy absorption characteristics and deformation pattern directly determine the structural distortion of body tail in collision process below, thus touch the safety of fuel oil system after affecting.Design for back longitudinal beam structure needs to follow back to front (garage direction back to front) and becomes successively greatly, thus ensures reasonably to be out of shape order and good energy-absorbing effect in collision process.At present, the lightweight of automobile has become the trend of automobile industry development, how to realize the lightweight of back longitudinal beam structure, and ensures its structural collision performance and meet rigidity requirement to become a challenge.
At present, for the structure design of floor side member, in order to meet the requirement that rigidity back to front increases successively, usual floor side member is overlapped by the thin-walled girder work that uniform cross section thickness is different by two sections, front and back, be combined by soldering group, as depicted in figs. 1 and 2, the structural representation of existing a kind of floor side member is shown.This floor side member is formed by floor side member leading portion 10 and floor side member back segment 12 overlap joint, and the region system of both overlap joints is welded and fixed by solder joint, and wherein the thickness of floor side member leading portion 10 thin-walled is at the thickness being greater than floor side member back segment 12 thin-walled.This structure, certain degree can realize the designing requirement increased successively back to front of rigidity, but also there is very large weak point;
First, the rigidity of floor side member has larger sudden change in overlapping regions, the rigidity in this region is maximum, therefore make the rigidity of floor side member there will be the situation of first increases and then decreases, stress is easily caused to concentrate and rigidity jump change, be unfavorable for the transmission of impact force, thus affect intensity and the wear properties of floor side member;
And this structure have employed overlap, need two sections of floor side members to overlap, be unfavorable for the lightweight of back longitudinal beam structure.
In addition, this structure needs welding process to realize the manufacture of floor side member, and floor side member is made up of two parts simultaneously, too increases number of molds and die sinking expense.
Summary of the invention
Technical matters to be solved by this invention is, provides a kind of automobile rear longitudinal girder structure and manufacture method, can realize the lightweight of vehicle body rear longitudinal beam structure, can improve again back longitudinal beam structure intensity and structure energy absorbing efficiency.
In order to solve the problems of the technologies described above, the one side of the embodiment of the present invention provides automobile rear longitudinal girder structure, it at least has straight beam section, described straight beam section is metal thin-wall structure, the thickness of the thin-walled of described floor side member rearmost end is the first thickness, and the thickness of described floor side member thin-walled is foremost the second thickness, and described second thickness is greater than described first thickness, in the rear longeron has a region at least, the thickness of its thin-walled is from described first thickness consecutive variations to described second thickness.
Wherein, described region is that described floor side member is overall, and from described floor side member foremost to described floor side member rearmost end, its thickness is from described second thickness even variation to described first thickness.
Wherein, described floor side member comprises floor side member back segment and floor side member leading portion, described floor side member leading portion be the thickness of described thin-walled from described first thickness consecutive variations to the region of described second thickness, the thickness of the thin-walled of described floor side member back segment is the first thickness.
Wherein, described floor side member comprises floor side member back segment and floor side member leading portion, described floor side member back segment be the thickness of described thin-walled from described first thickness consecutive variations to the region of described second thickness, the thickness of the thin-walled of described floor side member leading portion is the second thickness.
Wherein, described first thickness and the second thickness are between 1.0mm ~ 2.5mm, and described floor side member is integrally formed.
Wherein, the cross-sectional plane of the straight beam section of described automobile rear longitudinal girder is analog-U shaped, rectangle, circle, ellipse or rhombus, and described floor side member is at straight beam section, the periphery of its front-end cross-sectional view is identical with the periphery in cross sectional rear end face, or the periphery of described its cross-sectional plane of floor side member diminishes to the back-end gradually from front end along its length.
Correspondingly, the another aspect of the embodiment of the present invention, also provides a kind of manufacture method of automobile rear longitudinal girder, comprises the steps:
Select one piece of thickness to be the steel plate of the second thickness, make at least one area thickness of described steel plate reduce to the first thickness gradually from front to back by flexible rolling technique;
Punching press is carried out to described steel plate, form the floor side member that at least has straight beam section, described straight beam section is metal thin-wall structure, the thickness of the thin-walled of described floor side member rearmost end is made to be the first thickness, the thickness of described floor side member thin-walled is foremost the second thickness, described second thickness is greater than described first thickness, in the rear longeron has a region at least, and the thickness of its thin-walled is from described first thickness consecutive variations to described second thickness.
Wherein, described first thickness and the second thickness are between 1.0mm ~ 2.5mm.
Wherein, the cross-sectional plane of the straight beam section of described automobile rear longitudinal girder is analog-U shaped, rectangle, circle, ellipse or rhombus.
Wherein, described floor side member is at straight beam section, and the periphery of its front-end cross-sectional view is identical with the periphery in cross sectional rear end face, or the periphery of described its cross-sectional plane of floor side member diminishes to the back-end gradually from front end along its length.
Implement the present invention, there is following beneficial effect:
In back longitudinal beam structure of the present invention the thin-walled at least one region from back to front its thickness become large gradually, can ensure that back longitudinal beam structure rigidity increases back to front successively, meet the requirement of floor side member impingement designed;
The thickness of back longitudinal beam structure on longitudinal direction (length direction) and hardness smooth variation, and there is not stress concentration phenomenon, there is good forming property;
Back longitudinal beam structure once-forming, relative to existing floor side member form, decreases welding sequence, improves manufacture efficiency, and can ensure the planarization of surface of the work, stability and integraty;
Improve intensity and the structure energy absorbing efficiency of floor side member, promote the safety of automobile rear collision, ensure that every safety index meets the statutory standard of automobile rear collision;
Realize the lightweight of back longitudinal beam structure, weight loss effect is obvious, and economic benefit is given prominence to, and cost reduces, saving resource.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of existing a kind of automobile rear longitudinal girder;
Fig. 2 is the enlarged diagram of the local A in Fig. 1;
Fig. 3 is automobile rear longitudinal girder structural representation in one embodiment of the invention;
Fig. 4 is automobile rear longitudinal girder structural representation in another embodiment of the present invention;
Fig. 5 is the enlarged diagram of the local B in Fig. 4;
Fig. 6 is automobile rear longitudinal girder structural representation in another embodiment of the present invention;
Fig. 7 is the enlarged diagram of the Local C in Fig. 6.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Shown in Figure 3, show a kind of automobile rear longitudinal girder structural representation in one embodiment of the invention.Wherein, this automobile rear longitudinal girder structure, the thickness of the thin-walled of its floor side member rearmost end is the first thickness (t1), the thickness of its floor side member thin-walled is foremost the second thickness (t2), wherein, this second thickness (t2) is greater than the first thickness (t1), floor side member has a region at least, the thickness of its thin-walled is from the second thickness (t2) consecutive variations to the first thickness (t1), particularly, in this embodiment, this floor side member is integrally formed, this region is that floor side member is overall, namely this floor side member arrives floor side member rearmost end foremost, its thickness is from the second thickness (t2) even variation to described first thickness (t1).In one embodiment, this first thickness (t1) and the second thickness (t2) are between 1.0mm ~ 2.5mm.
Wherein, in this embodiment, the cross-sectional plane of the straight beam section of automobile rear longitudinal girder is analog-U shaped (square frame of upward opening), when being understandable that, in other examples, the cross-sectional plane of the straight beam section of this automobile rear longitudinal girder can rectangle, circle, ellipse or rhombus etc.
Wherein, in this embodiment, automobile rear longitudinal girder is at straight beam section, and the periphery of its its cross-sectional plane of floor side member diminishes to the back-end gradually from front end along its length; Understandable equally, in other examples, automobile rear longitudinal girder is at straight beam section, and the periphery of the front-end cross-sectional view of its floor side member can be identical with the periphery in cross sectional rear end face.
As shown in Figure 4 and Figure 5, the automobile rear longitudinal girder structure of another embodiment of the present invention is shown.The difference of the automobile rear longitudinal girder structure of this embodiment and the back longitudinal beam structure shown in Fig. 3 is, this floor side member comprises floor side member leading portion 20 and floor side member rear end 22, wherein, floor side member back segment 22 is the region of thickness from the second thickness (t2) consecutive variations to the first thickness (t1) of thin-walled, and the thickness of the thin-walled of this floor side member leading portion 20 is the second thickness (t2).Wherein, the first thickness (t1) and the second thickness (t2) are between 1.0mm ~ 2.5mm, and floor side member is integrally formed.The cross-sectional plane of its straight beam section is identical with last enforcement, can be analog-U shaped, rectangle, circle, ellipse or rhombus, and this floor side member is at straight beam section, the periphery of its front-end cross-sectional view is identical with the periphery in cross sectional rear end face, or the periphery of this its cross-sectional plane of floor side member diminishes to the back-end gradually from front end along its length.
As shown in Figure 6 and Figure 7, the automobile rear longitudinal girder structure of another embodiment of the present invention is shown.The difference of the automobile rear longitudinal girder structure of this embodiment and the back longitudinal beam structure shown in Fig. 3 is, this floor side member comprises floor side member leading portion 20 and floor side member rear end 22, wherein, floor side member leading portion 20 is the region of thickness from the second thickness (t2) consecutive variations to the first thickness (t1) of thin-walled, and the thickness of the thin-walled of this floor side member back segment is the first thickness (t1).Wherein, the first thickness (t1) and the second thickness (t2) are between 1.0mm ~ 2.5mm, and floor side member is integrally formed.The cross-sectional plane of its straight beam section is identical with last enforcement, can be analog-U shaped, rectangle, circle, ellipse or rhombus, and this floor side member is at straight beam section, the periphery of its front-end cross-sectional view is identical with the periphery in cross sectional rear end face, or the periphery of this its cross-sectional plane of floor side member diminishes to the back-end gradually from front end along its length.
As another aspect of the present invention, additionally provide a kind of manufacture method of back longitudinal beam structure, in one embodiment, it comprises the steps:
One piece of thickness is selected to be the steel plate of the second thickness (t2), at least one area thickness of this steel plate is made to reduce to the first thickness (t1) from front to back gradually by flexible rolling technique, wherein, this second thickness (t2) and the first thickness (t1) can be selected to be between 1.0mm ~ 2.5mm as required;
Punching press is carried out to this steel plate, form the floor side member that at least has straight beam section, this straight beam section is metal thin-wall structure, the thickness of the thin-walled of this floor side member rearmost end is the first thickness (t1), the thickness of floor side member thin-walled is foremost the second thickness (t2), wherein the second thickness (t2) is greater than the first thickness (t1), and on this floor side member at least one region the thickness of its thin-walled from the second thickness (t2) consecutive variations to the first thickness (t1).
Particularly, in one embodiment, this region can be made for this floor side member entirety, and from this floor side member foremost to this floor side member rearmost end, its thickness is from the second thickness (t2) even variation to the first thickness (t1).
In another embodiment, this floor side member can be made to comprise floor side member back segment and floor side member leading portion, make this floor side member back segment as the thickness of thin-walled from the region of the second thickness (t2) even variation to the first thickness (t1), make the thickness of the thin-walled of floor side member leading portion be the first thickness (t2).
In a further embodiment, this floor side member can be made to comprise floor side member back segment and floor side member leading portion, make this floor side member leading portion as the thickness of thin-walled from the region of the second thickness (t2) even variation to the first thickness (t1), make the thickness of the thin-walled of floor side member back segment be the second thickness (t1).
Wherein, in one embodiment, the cross-sectional plane of the straight beam section of automobile rear longitudinal girder can be stamped into analog-U shaped (square frame of upward opening), when being understandable that, in other examples, the cross-sectional plane of the straight beam section of this automobile rear longitudinal girder can be stamped into rectangle, circle, ellipse or rhombus etc.
Wherein, in one embodiment, automobile rear longitudinal girder is at straight beam section, and the periphery of its its cross-sectional plane of floor side member diminishes (as shown in Figure 5) to the back-end gradually from front end along its length; Understandable equally, in other examples, automobile rear longitudinal girder is at straight beam section, and the periphery of the front-end cross-sectional view of its floor side member can be identical with the periphery in cross sectional rear end face.
Implement the present invention, there is following beneficial effect:
The thin-walled at least one region of back longitudinal beam structure of the present invention from back to front its thickness becomes large gradually, can ensure that back longitudinal beam structure rigidity increases back to front successively, meet the requirement of floor side member impingement designed;
The thickness of back longitudinal beam structure on longitudinal direction (length direction) and hardness smooth variation, and there is not stress concentration phenomenon, there is good forming property;
Back longitudinal beam structure once-forming, relative to common floor side member form, decreases welding sequence, improves manufacture efficiency, and can ensure the planarization of surface of the work, stability and integraty;
Improve intensity and the structure energy absorbing efficiency of floor side member, promote the safety of automobile rear collision, ensure that every safety index meets the statutory standard of automobile rear collision;
Realize the lightweight of back longitudinal beam structure, weight loss effect is obvious, and economic benefit is given prominence to, and cost reduces, saving resource.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. an automobile rear longitudinal girder structure, it is characterized in that, it at least has straight beam section, described straight beam section is metal thin-wall structure, the thickness of the thin-walled of described floor side member rearmost end is the first thickness, and the thickness of described floor side member thin-walled is foremost the second thickness, and described second thickness is greater than described first thickness, in the rear longeron has a region at least, the thickness of its thin-walled is from described second thickness consecutive variations to described first thickness.
2. a kind of automobile rear longitudinal girder structure as claimed in claim 1, is characterized in that, described region is that described floor side member is overall, and from described floor side member foremost to described floor side member rearmost end, its thickness is from described second thickness even variation to described first thickness.
3. a kind of automobile rear longitudinal girder structure as claimed in claim 1, it is characterized in that, described floor side member comprises floor side member back segment and floor side member leading portion, described floor side member leading portion be the thickness of described thin-walled from described first thickness consecutive variations to the region of described second thickness, the thickness of the thin-walled of described floor side member back segment is the first thickness.
4. a kind of automobile rear longitudinal girder structure as claimed in claim 1, it is characterized in that, described floor side member comprises floor side member back segment and floor side member leading portion, described floor side member back segment be the thickness of described thin-walled from described first thickness consecutive variations to the region of described second thickness, the thickness of the thin-walled of described floor side member leading portion is the second thickness.
5. as right wants the automobile rear longitudinal girder structure as described in 1 to 4 any one, it is characterized in that, described first thickness and the second thickness are between 1.0mm ~ 2.5mm, and described floor side member is integrally formed.
6. automobile rear longitudinal girder structure as claimed in claim 5, it is characterized in that, the cross-sectional plane of the straight beam section of described automobile rear longitudinal girder is analog-U shaped, rectangle, circle, ellipse or rhombus, and described floor side member is at straight beam section, the periphery of its front-end cross-sectional view is identical with the periphery in cross sectional rear end face, or the periphery of described its cross-sectional plane of floor side member diminishes to the back-end gradually from front end along its length.
7. a manufacture method for automobile rear longitudinal girder, is characterized in that, comprises the steps:
Select one piece of thickness to be the steel plate of the second thickness, make at least one area thickness of described steel plate reduce to the first thickness gradually from front to back by flexible rolling technique;
Punching press is carried out to described steel plate, form the floor side member that at least has straight beam section, described straight beam section is metal thin-wall structure, the thickness of the thin-walled of described floor side member rearmost end is made to be the first thickness, the thickness of described floor side member thin-walled is foremost the second thickness, described second thickness is greater than described first thickness, in the rear longeron has a region at least, and the thickness of its thin-walled is from described first thickness consecutive variations to described second thickness.
8. as right wants the automobile rear longitudinal girder manufacture method as described in 7, it is characterized in that, described first thickness and the second thickness are between 1.0mm ~ 2.5mm.
9. automobile rear longitudinal girder manufacture method as claimed in claim 7 or 8, it is characterized in that, the cross-sectional plane of the straight beam section of described automobile rear longitudinal girder is analog-U shaped, rectangle, circle, ellipse or rhombus.
10. automobile rear longitudinal girder manufacture method as claimed in claim 9, it is characterized in that, described floor side member is at straight beam section, and the periphery of its front-end cross-sectional view is identical with the periphery in cross sectional rear end face, or the periphery of described its cross-sectional plane of floor side member diminishes to the back-end gradually from front end along its length.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310265192.4A CN104249759A (en) | 2013-06-28 | 2013-06-28 | Automobile rear longitudinal beam structure and manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310265192.4A CN104249759A (en) | 2013-06-28 | 2013-06-28 | Automobile rear longitudinal beam structure and manufacturing method |
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| CN104249759A true CN104249759A (en) | 2014-12-31 |
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| CN201310265192.4A Pending CN104249759A (en) | 2013-06-28 | 2013-06-28 | Automobile rear longitudinal beam structure and manufacturing method |
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Cited By (4)
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| CN104925009A (en) * | 2015-06-30 | 2015-09-23 | 宝山钢铁股份有限公司 | Variable-thickness automobile front bumper and manufacturing method thereof |
| CN110508676A (en) * | 2019-09-02 | 2019-11-29 | 新程汽车工业有限公司 | The processing technology of car lightweight floor side member |
| CN111391923A (en) * | 2020-04-02 | 2020-07-10 | 宁波吉利汽车研究开发有限公司 | Rear longitudinal beam assembly for vehicle and design method thereof |
| CN111483523A (en) * | 2019-01-25 | 2020-08-04 | 丰田自动车株式会社 | Vehicle body structure |
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| CN104925009A (en) * | 2015-06-30 | 2015-09-23 | 宝山钢铁股份有限公司 | Variable-thickness automobile front bumper and manufacturing method thereof |
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