阅读说明：本技术 一种抵抗小偏置碰的车身结构及前连接件的铸造方法 (Vehicle body structure resisting small offset collision and casting method of front connecting piece ) 是由 姜潮 雷飞 韩旭 张天昊 于 2020-12-28 设计创作，主要内容包括：本发明提供了一种抵抗小偏置碰的车身结构,包括前防撞横梁、沿前防撞横梁对称布置的前纵梁以及位于前防撞横梁上方的上传力路径结构,所述前纵梁与前防撞横梁之间设置有吸能盒,所述上传力路径结构包括上横梁以及沿上横梁对称布置的车身侧面结构,所述车身侧面结构包括竖向连接梁、上纵梁、前连接件和一体化侧围所述竖向连接梁的一端与前纵梁连接,另一端与上纵梁连接,所述上纵梁的一端与上横梁连接,另一端与前连接件连接,所述前纵梁和一体化侧围分别与前连接件连接。本发明提供的车身结构形成了多个闭环路径,有效对碰撞力进行传递,保证乘员的安全。本发明还提供了一种抵抗小偏置碰的车身结构的前连接件的铸造方法。(The invention provides a vehicle body structure resisting small offset collision, which comprises a front anti-collision cross beam, front longitudinal beams symmetrically arranged along the front anti-collision cross beam and an upper force transmission path structure positioned above the front anti-collision cross beam, wherein an energy absorption box is arranged between the front longitudinal beams and the front anti-collision cross beam, the upper force transmission path structure comprises an upper cross beam and a vehicle body side structure symmetrically arranged along the upper cross beam, the vehicle body side structure comprises a vertical connecting beam, an upper longitudinal beam, a front connecting piece and an integrated side wall, one end of the vertical connecting beam is connected with the front longitudinal beam, the other end of the vertical connecting beam is connected with the upper longitudinal beam, one end of the upper longitudinal beam is connected with the upper cross beam, the other end of the upper longitudinal beam is connected with the front connecting piece. The vehicle body structure provided by the invention forms a plurality of closed-loop paths, effectively transmits collision force and ensures the safety of passengers. The invention also provides a method for casting a front connection piece of a vehicle body structure resisting small offset collision.)

1. The utility model provides a resist automobile body structure that small off-set bumped, includes preceding crashproof crossbeam (101), along front longitudinal beam (4) of preceding crashproof crossbeam (101) symmetrical arrangement and be located the last power path structure of preceding crashproof crossbeam (101) top, be provided with energy-absorbing box (102) between front longitudinal beam (4) and preceding crashproof crossbeam (101), its characterized in that, go up power path structure and include entablature (501) and along the automobile body side structure of entablature (501) symmetrical arrangement, automobile body side structure includes vertical tie-beam (3), entablature (502), front connecting piece (2) and integration side wall (7), the one end and the front longitudinal beam (4) of vertical tie-beam (3) are connected, and the other end is connected with entablature (502), the one end and the entablature (501) of entablature (502) are connected, and the other end is connected with front connecting piece (2), the front longitudinal beam (4) and the integrated side wall (7) are respectively connected with the front connecting piece (2).

2. A vehicle body structure resistant to small offset collision according to claim 1, characterized in that: the automobile body side structure still includes threshold roof beam (8) and back connecting piece (9), the one end and the preceding connecting piece (2) of threshold roof beam (8) are connected, and the other end is connected with back connecting piece (9), integration side wall (7) also are connected with back connecting piece (9).

3. A vehicle body structure resistant to small offset collision according to claim 2, characterized in that: the front connecting piece (2) and the rear connecting piece (9) are respectively formed by casting.

4. A vehicle body structure resistant to small offset collision according to claim 1, characterized in that: still include front portion crossbeam (6) and rear portion crossbeam (10), front portion crossbeam (6) are close to the head end of automobile body and the both ends of front portion crossbeam (6) and are connected with automobile body side structure respectively, rear portion crossbeam (10) are close to the tail end of automobile body and the both ends of rear portion crossbeam (10) are connected with automobile body side structure respectively.

5. A vehicle body structure resistant to small offset collision according to any one of claims 1 to 4, wherein: preceding connecting piece (2) are including preceding connecting piece body (21), first connecting portion (22) and second connecting portion (23), first connecting portion (22) are close to the bottom of preceding connecting piece body (21) just first connecting portion (22) are used for being connected with front longitudinal beam (4), second connecting portion (23) are close to the top of preceding connecting piece body (21) just second connecting portion (23) are used for being connected with last longeron (502).

6. A vehicle body structure resistant to small offset collision according to claim 5, characterized in that: the first connection portion (22) includes an opening (221) and a groove (222), the opening (221) communicates with the groove (222) and the groove (222) protrudes outward of the opening (221); one side of the front longitudinal beam (4) is provided with a convex strip (223), the convex strip (223) is inserted into the groove (222) and fixedly connected with the first connecting portion (22), and the front longitudinal beam (4) is inserted into the opening (221) and fixedly connected with the first connecting portion (22).

7. A vehicle body structure resistant to small offset collision according to claim 5, characterized in that: go up longeron (502) including the overlap edge, the overlap edge is bent to one side and is formed first overlap portion (233) and second overlap portion (234), the second connecting portion are including bending limit and stiffening rib (235), the bending limit is bent to one side and is formed first kink (231) and second kink (232), first overlap portion (234) with first kink (231) fixed connection, second overlap portion (234) with second kink (232) fixed connection, the stiffening rib just is located the one side that deviates from the overlap edge with bending limit fixed connection.

8. A vehicle body structure resistant to small offset crash as set forth in claim 7, wherein: the bending angle of the overlapping edge is equal to that of the bending edge.

9. A method of casting a front attachment for a vehicle body structure that resists low offset crash, comprising the steps of:

s1, carrying out mixed smelting on an aluminum alloy material, and preheating a casting mold at the temperature of 180-220 ℃;

s2, injecting the mixed and smelted aluminum alloy material into a preheated mold, and then closing the mold;

s3, injecting oxygen into a mold injection cavity and a mold cavity of the mold, so that the injection cavity and the mold cavity are filled with the oxygen to remove the rest gas, and the aluminum and the oxygen react to form dispersed aluminum oxide particles;

and S4, pushing the molten aluminum alloy material to fill the cavity through the injection punch, finishing pressurization and demolding after the metal is solidified.

10. The method of casting a front attachment of a vehicle body structure that resists small offset crash as set forth in claim 9, wherein: the aluminum alloy material comprises the following components in percentage by mass: 6 to 8 percent of silicon element, 0.4 to 0.6 percent of magnesium element, 1.5 to 2.5 percent of zinc element, 0.3 to 0.5 percent of copper element, 0.6 to 0.9 percent of nickel element, 0.6 to 0.9 percent of tin element, 0.1 to 0.2 percent of titanium element, 0.1 to 0.2 percent of iron element, 0.1 to 0.2 percent of chromium element and the balance of aluminum element.

Technical Field

The invention relates to the field of automobile body structure design, in particular to a small offset collision resisting automobile body structure and a casting method of a front connecting piece

Technical Field

The small offset collision is a common accident type, and vehicle accident data collected by the CIDAS in 6 months from 2011 to 2013 according to the deep investigation of Chinese traffic accidents shows that the proportion of the small offset collision accident type is 15%. In order to better simulate actual traffic accidents and protect personal safety, the national highway safety and insurance Association IIHS sets out a front 25% offset collision test to detect the performance of resisting small offset collision of a vehicle, namely, the vehicle impacts a fixed rigid barrier on the front at the speed per hour of 64.4km/h +/-1 km/h and the overlapping rate of 25% +/-1%. In the mode, the front anti-collision cross beam, the energy absorption box and the front longitudinal beam of most vehicles have no contact with the barrier in the collision process or have little contact, so that the collision kinetic energy cannot be absorbed through the plastic deformation of the front end structure of the vehicle body. If the vehicle collides with the rigid barrier under the condition of almost no energy absorption and deceleration, the rigid barrier directly pushes the tire to impact the passenger compartment, so that the passenger compartment is deformed and bent, the structure is large-area failed, and the life safety of personnel is seriously threatened.

The patent with the publication number of CN207208209U discloses a vehicle body structure of lightweight high strength, including the automobile body, the symmetry is provided with front beam and rear frame member around the automobile body top, the front beam with the symmetry is provided with first longeron and second longeron between the rear frame member, just the lateral surface of first longeron with the lateral surface of second longeron all with automobile body fixed connection, first longeron with be provided with the top cap between the second longeron, just the front and back both ends of top cap respectively with the front beam with rear frame member fixed connection. The vehicle body structure is intended to solve the problem of weight reduction of an automobile, but cannot form an effective collision force transmission path when a small offset collision occurs, and is difficult to resist the small offset collision.

The patent with the publication number of CN211364479U discloses a vehicle body end reinforcing structure for offset collision, which comprises a mounting plate and a vehicle body reinforcing plate assembly for collision energy absorption, wherein one surface of the mounting plate is connected with a front anti-collision beam of a vehicle body, and the other surface of the mounting plate is connected with a front longitudinal beam of the vehicle body; the vehicle body reinforcing plate assembly is respectively connected with the mounting plate and the vehicle body front longitudinal beam and is positioned on one side of the mounting plate, which is far away from the vehicle body front anti-collision beam; and the vehicle body reinforcing plate assembly is provided with a guide surface for decomposing collision force. The reinforcing structure is used for resisting small offset collision of a vehicle, but the transmission path of the collision force is single, so that the small offset collision is difficult to resist.

Disclosure of Invention

In order to solve the technical problems, the invention provides a vehicle body structure resisting small offset collision, and the specific technical scheme is as follows.

The utility model provides a resist automobile body structure that small off-set bumped, includes preceding crashproof crossbeam, follows the front longitudinal of preceding crashproof crossbeam symmetrical arrangement and is located the last biography power path structure of preceding crashproof crossbeam top, be provided with the energy-absorbing box between front longitudinal and the preceding crashproof crossbeam, it includes entablature and the automobile body side structure along entablature symmetrical arrangement to go up biography power path structure, automobile body side structure includes vertical tie-beam, last longeron, preceding connecting piece and integration side wall, the one end and the front longitudinal of vertical tie-beam are connected, and the other end is connected with last longeron, the one end and the entablature of going up the longeron are connected, and the other end is connected with preceding connecting piece, front longitudinal and integration side wall are connected.

Further, the automobile body side structure still includes threshold roof beam and back connecting piece, the one end and the preceding connecting piece of threshold roof beam are connected, and the other end is connected with the back connecting piece, the integration side wall also is connected with the back connecting piece.

Furthermore, the front connecting piece and the rear connecting piece are respectively formed by casting.

The automobile body side structure comprises a front cross beam and a rear cross beam, wherein the front cross beam is close to the head end of the automobile body, the two ends of the front cross beam are respectively connected with the automobile body side structure, and the rear cross beam is close to the tail end of the automobile body, and the two ends of the rear cross beam are respectively connected with the automobile body side structure.

Furthermore, the front connecting piece comprises a front connecting piece body, a first connecting portion and a second connecting portion, the first connecting portion is close to the bottom end of the front connecting piece body and is used for being connected with the front longitudinal beam, and the second connecting portion is close to the top end of the front connecting piece body and is used for being connected with the upper longitudinal beam.

Further, preceding connecting piece body, first connecting portion and second connecting portion, first connecting portion are close to the bottom of preceding connecting piece body just first connecting portion are used for being connected with the front longitudinal, second connecting portion are close to preceding connecting piece top just second connecting portion are used for being connected with last longeron.

Further, it includes the overlap edge to go up the longeron, the overlap edge is bent to one side and is formed first overlap joint portion and second overlap joint portion, second connecting portion are including the limit of buckling and stiffening rib, the limit of buckling is bent to one side and is formed first kink and second kink, first overlap joint portion with first kink fixed connection, second overlap joint portion with second kink fixed connection, the stiffening rib just is located the one side that the limit of buckling deviates from the overlap edge with the limit of buckling fixed connection.

Has the advantages that: 1. the vehicle body structure provided by the invention forms a plurality of closed-loop paths for conducting the collision force generated by small offset collision to the vehicle body, and particularly comprises a transverse closed-loop path formed by a front anti-collision cross beam, an energy absorption box, a front longitudinal beam and a front cross beam, a longitudinal closed-loop path formed by a front connecting piece, a doorsill beam, a rear connecting piece and an integrated side wall, and a front closed-loop path formed by the front anti-collision cross beam, the energy absorption box, a vertical connecting beam, the front longitudinal beam, an upper cross beam, the upper longitudinal beam, the front cross beam and the front connecting piece.

2. The vehicle body structure provided by the invention is connected with each part of the vehicle body through the front connecting piece and the rear connecting piece, has high part integration level and simple structure, can effectively reduce the number of parts of the vehicle body, and can meet the requirement of light weight of the vehicle body while resisting small offset collision.

3. The vehicle body structure provided by the invention comprises a front connecting piece, wherein the front connecting piece is connected with a front longitudinal beam through a first connecting part and is connected with an upper longitudinal beam through a second connecting part, the first connecting part is provided with an opening and a groove, the front longitudinal beam is respectively connected with the front connecting piece through the opening and the groove, the second connecting part is provided with a bending edge and a reinforcing rib, the upper longitudinal beam is connected with the front connecting piece through the bending edge, and when small offset collision is generated, the generated torque and bending moment can be resisted, and the deformation of the front connecting piece and the connecting part thereof can be resisted, so that the front connecting piece can better transmit the action generated by the small offset collision to a vehicle body, the deformation of the vehicle body is reduced, and.

The invention also provides a casting method of the front connecting piece of the car body structure resisting small offset collision, which comprises the following steps:

s1, carrying out mixed smelting on an aluminum alloy material, and preheating a casting mold at the temperature of 180-220 ℃;

s2, injecting the mixed and smelted aluminum alloy material into a preheated mold, and then closing the mold;

s3, injecting oxygen into a mold injection cavity and a mold cavity of the mold, so that the injection cavity and the mold cavity are filled with the oxygen to remove the rest gas, and the aluminum and the oxygen react to form dispersed aluminum oxide particles;

and S4, pushing the molten aluminum alloy material to fill the cavity through the injection punch, finishing pressurization and demolding after the metal is solidified.

Further, the aluminum alloy material comprises the following components in percentage by mass: 6 to 8 percent of silicon element, 0.4 to 0.6 percent of magnesium element, 1.5 to 2.5 percent of zinc element, 0.3 to 0.5 percent of copper element, 0.6 to 0.9 percent of nickel element, 0.6 to 0.9 percent of tin element, 0.1 to 0.2 percent of titanium element, 0.1 to 0.2 percent of iron element, 0.1 to 0.2 percent of chromium element and the balance of aluminum element.

Has the advantages that: 1. according to the casting method of the front connecting piece, provided by the invention, the aluminum alloy material is cast in a die-casting mode to form the front connecting piece, oxygen is injected into the injection cavity and the cavity before the injection process, and other gases are removed, so that dispersed aluminum oxide particles are produced in the die-casting process of the front connecting piece and are distributed in the front connecting piece, thus air holes in a casting are reduced, and the compactness of the casting is improved; the front connecting piece prepared by the casting method is connected with parts such as a front longitudinal beam, an upper longitudinal beam, a threshold beam, an integrated side wall and the like, so that the front connecting piece can better transmit the collision force generated by small offset collision, and the safety of passengers is ensured by resisting the small offset collision.

2. According to the casting method of the front connecting piece, the front connecting piece cast according to the proportion can meet the requirements of reducing the weight of a vehicle body and lightening the weight of the vehicle body, has a good energy absorption effect, can buffer when small offset collision occurs, and protects the safety of passengers.

Drawings

FIG. 1 is a schematic illustration of a vehicle body structure according to the present invention;

FIG. 2 is a schematic illustration of the transfer of crash forces within a vehicle body structure during a small offset crash in accordance with the present invention;

FIG. 3 is a schematic structural view of a front connector of the present invention;

FIG. 4 is a schematic view of a connection portion between the first connection portion and the front side member according to the present invention;

FIG. 5 is a schematic view of a connection portion between a second connection portion and an upper side member according to the present invention;

fig. 6 is a schematic structural view of the rear connector.

Reference numerals: 2-front connecting piece; 3-vertical connecting beams; 4-front longitudinal beam; 6-front cross beam; 7-integral side walls; 8-sill beam; 9-rear connection; 10-a rear cross beam; 101-front anti-collision beam; 102-a crash box; 501-an upper cross beam; 502-upper stringer; 21-front connector body; 22-a first connection; 23-a second connection; 221-opening; 222-a groove; 223-convex strips; 231-a first bending part; 232-a second bend; 233-a first lap joint; 234 — a second strap; 235-reinforcing ribs.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1, a vehicle body structure resisting small offset collision comprises a front anti-collision cross beam 101, front longitudinal beams 4 symmetrically arranged along the front anti-collision cross beam 101, and an upper force transmission path structure located above the front anti-collision cross beam 101, wherein an energy absorption box 102 is arranged between the front longitudinal beams 4 and the front anti-collision cross beam 101, and the vehicle body structure is characterized in that the upper force transmission path structure comprises an upper cross beam 501 and a vehicle body side structure symmetrically arranged along the upper cross beam 501, the vehicle body side structure comprises a vertical connecting beam 3, an upper longitudinal beam 502, a front connecting piece 2 and an integrated side wall 7, one end of the vertical connecting beam 3 is connected with the front longitudinal beam 4, the other end of the vertical connecting beam is connected with the upper longitudinal beam 502, one end of the upper longitudinal beam 502 is connected with the upper cross beam 501, the other end of the vertical connecting beam is connected with the front.

In the embodiment, a front anti-collision cross beam 101 is arranged at the front end of a vehicle body, front longitudinal beams 4 are symmetrically arranged along the front anti-collision cross beam 101, an energy absorption box 102 is arranged between the front longitudinal beams 4 and the front anti-collision cross beam 101, the front longitudinal beams 4 and the front longitudinal beams are connected in a riveting mode and are respectively connected with an upper cross beam 501 and the front longitudinal beams 4 through vertical connecting beams 3, the front longitudinal beams 4, the upper longitudinal beams 502 and integrated side walls 7 are respectively connected with a front connecting piece 2, a transverse closed loop path formed by the anti-collision cross beams, the energy absorption box 102, the front longitudinal beams 4 and the front cross beam is formed, a longitudinal closed loop path formed by the front connecting piece 2, a doorsill beam 8, a rear connecting piece 9 and the integrated side walls 7 is formed, a front closed loop path is formed by the front anti-collision beams, the energy absorption box 102, the vertical connecting beams 3, the front, the collision force generated by the small offset collision is transmitted to the vehicle body through the three closed-loop paths, so that the safety of passengers can be effectively ensured when the small offset occurs.

Particularly, the side structure of the vehicle body further comprises a threshold beam 8 and a rear connecting piece 9, one end of the threshold beam 8 is connected with the front connecting piece 2, the other end of the threshold beam is connected with the rear connecting piece 9, and the integrated side wall 7 is also connected with the rear connecting piece 9.

When a small offset collision occurs, as shown in fig. 1, the generated collision force is respectively guided to the front longitudinal beam 4 and the vertical connecting beam 3 through the front anti-collision cross beam 101, then the front longitudinal beam 4 is guided to the integrated side wall and the threshold beam 8 through the connecting piece, the vertical connecting beam 3 is guided to the upper cross beam 501 and the upper longitudinal beam 502, and the collision force is effectively transmitted through three closed-loop paths, so that the energy absorption effect of the vehicle body is effectively improved, the deformation of the vehicle body is reduced, and the safety of passengers is ensured.

Specifically, the front connecting piece 2 and the rear connecting piece 9 are respectively formed by casting. The front connecting piece 2 and the rear connecting piece 9 are formed by the same casting method, and different moulds are adopted according to different structures of the front connecting piece 2 and the rear connecting piece 9.

Further, the automobile body structure comprises a front cross beam 6 and a rear cross beam 10, wherein the front cross beam 6 is close to the head end of the automobile body, two ends of the front cross beam 6 are respectively connected with the side structure of the automobile body, the rear cross beam 10 is close to the tail end of the automobile body, and two ends of the rear cross beam 10 are respectively connected with the side structure of the automobile body. Specifically, the front cross beams 6 are respectively connected with the front connecting pieces 2 of the two side body side structures in a flanging riveting mode, and the rear cross beams 10 are respectively connected with the rear connecting pieces 9 of the two side body side structures in a flanging riveting mode. The side structures of the automobile body on the two sides are connected through the front cross beam 6 and the rear cross beam 10, so that when small offset collision occurs on one side of the automobile body, collision force can be transmitted to the other side of the automobile body along the front cross beam 6 and the rear cross beam 10, the energy absorption effect of the automobile body is further improved, the deformation of the automobile body is reduced, and the safety of passengers is ensured.

Specifically, as shown in fig. 3, the front connecting member 2 includes a front connecting member body 21, a first connecting portion 22 and a second connecting portion 23, the first connecting portion 22, the second connecting portion 23 and the front connecting member body 21 are integrally formed, the first connecting portion 22 is close to the bottom end of the front connecting member body 21 and the first connecting portion 22 is used for being connected with the front side member 4, the second connecting portion 23 is close to the top end of the front connecting member body 21 and the second connecting portion 23 is used for being connected with the upper side member 502, and the front connecting member 2 is further connected with the threshold beam 8 and the integrated side wall 7 through riveting.

Specifically, as shown in fig. 4, the first connecting portion includes an opening 221 and a groove 222, the opening 221 communicates with the groove 222, and the groove 222 protrudes to the outside of the opening 221; a convex strip 223 is arranged on one side of the front longitudinal beam 4, the convex strip 223 is inserted into the groove 222 and is fixedly connected with the first connecting portion 22, the front longitudinal beam 4 is inserted into the opening 221 and is fixedly connected with the first connecting portion 22, structural glue is coated on the surface of the insertion portion before the front longitudinal beam 4 and the convex strip 223 are inserted, and the front longitudinal beam 4 is connected with the first connecting portion 22 through a welding and FDS (fully drawn yarn) transfer screw process or an SPR (surface plasma resonance) self-piercing riveting process. As shown in fig. 5, the upper longitudinal beam 502 includes a lap edge, the lap edge is bent to one side to form a first lap portion 233 and a second lap portion 234, the second connection portion includes a bent edge and a reinforcing rib 235, the bent edge is bent to one side to form a first bent portion 231 and a second bent portion 232, the first lap portion 233 is fixedly connected to the first bent portion 231, the second lap portion 234 is fixedly connected to the second bent portion 232, and the reinforcing rib 235 is fixedly connected to the bent edge and located on one side of the bent edge away from the lap edge. Structural glue is coated between the overlapping edges and the bending edges, and the upper longitudinal beam 502 is connected with the second connecting part 23 by adopting a welding and FDS (fully drawn yarn) circulation screw process or an SPR (surface plasma resonance) self-piercing riveting process.

Specifically, as shown in fig. 6, the rear connecting members 9 are respectively provided with connecting portions for connecting the integrated side panel 7 and the rocker beam 8, and the rear connecting members 9 are respectively connected to the integrated side panel 7 and the rocker beam 8 by caulking.

In the embodiment, a plurality of closed-loop paths are formed in the vehicle body structure to conduct the collision force generated by small offset collision to the vehicle body, and specifically, the closed-loop paths include a transverse closed-loop path formed by the front anti-collision cross beam 101, the energy absorption box 102, the front longitudinal beam 4 and the front cross beam 6, a longitudinal closed-loop path formed by the front connecting piece 2, the threshold beam 8, the rear connecting piece 9 and the integrated side wall 7, and a front closed-loop path formed by the front anti-collision cross beam 101, the energy absorption box 102, the vertical connecting beam 3, the front longitudinal beam 4, the upper cross beam 501, the upper longitudinal beam 502, the front cross beam 6 and the front connecting piece 2.

In this embodiment, the front connecting member 2 is connected to the front side member 4 through the first connecting portion 22, and is connected to the upper side member 502 through the second connecting portion 23, the first connecting portion 22 is provided with the opening 221 and the groove 222, the front side member 4 is connected to the front connecting member 2 through the opening 221 and the groove 222, respectively, the second connecting portion 23 is provided with the bent edge and the reinforcing rib 235, and the upper side member 502 is connected to the front connecting member 2 through the bent edge, so that when a small offset collision occurs, the generated torque and bending moment can be resisted, and deformation of the front connecting member 2 and the connecting portion thereof can be resisted, so that the front connecting member 2 can better transmit the effect generated by the small offset collision to the vehicle body, further reduce deformation of the vehicle body, and ensure safety of passengers.

Example 2

A method of casting a front connector 2 of a vehicle body structure resistant to small offset impacts, comprising the steps of:

s1, carrying out mixed smelting on an aluminum alloy material, and preheating a casting mold at the temperature of 180-220 ℃;

s2, injecting the mixed and smelted aluminum alloy material into a preheated mold, and then closing the mold;

s3, injecting oxygen into a mold injection cavity and a mold cavity of the mold, so that the injection cavity and the mold cavity are filled with the oxygen to remove the rest gas, and the aluminum and the oxygen react to form dispersed aluminum oxide particles;

and S4, pushing the molten aluminum alloy material to fill the cavity through the injection punch, finishing pressurization and demolding after the metal is solidified.

In the embodiment, the front connecting piece 2 of the car body structure is cast by the casting method, oxygen is injected into the injection cavity and the cavity before the injection process, other gases are exhausted, aluminum oxide particles are generated by reaction of metal aluminum and oxygen in the die-casting process, and the aluminum oxide particles are distributed in the cast front connecting piece 2 in a dispersed mode, so that air holes in a casting are reduced, the front connecting piece 2 cast by the method is applied to the car body structure and used as an important component for conducting collision force in the car body structure, the acting force of the front longitudinal beam 4 and the upper longitudinal beam 502 can be more effectively transmitted to the threshold beam 8, the front cross beam and the integrated side wall 7 by the front connecting piece 2, and accordingly small offset collision is resisted to ensure the safety of passengers.

Specifically, the aluminum alloy material comprises the following components in percentage by mass: 6 to 8 percent of silicon element, 0.4 to 0.6 percent of magnesium element, 1.5 to 2.5 percent of zinc element, 0.3 to 0.5 percent of copper element, 0.6 to 0.9 percent of nickel element, 0.6 to 0.9 percent of tin element, 0.1 to 0.2 percent of titanium element, 0.1 to 0.2 percent of iron element, 0.1 to 0.2 percent of chromium element and the balance of aluminum element.

In the embodiment, the front connecting piece 2 prepared from the aluminum alloy material with the proportion can reduce the self weight of the automobile body, meets the requirement of light weight, and has a good energy absorption effect, so that the front connecting piece can buffer when small offset collision occurs, and the safety of passengers is protected.

Example 3

A method of casting a front connector 2 of a vehicle body structure resistant to small offset impacts, comprising the steps of:

s1, carrying out mixed smelting on an aluminum alloy material, and preheating a casting mold at the temperature of 180-220 ℃;

s2, injecting the mixed and smelted aluminum alloy material into a preheated mold, and then closing the mold;

s3, injecting oxygen into a mold injection cavity and a mold cavity of the mold, so that the injection cavity and the mold cavity are filled with the oxygen to remove the rest gas, and the aluminum and the oxygen react to form dispersed aluminum oxide particles;

and S4, pushing the molten aluminum alloy material to fill the cavity through the injection punch, finishing pressurization and demolding after the metal is solidified.

Specifically, the aluminum alloy material comprises the following components in percentage by mass: 7 percent of silicon element, 0.5 percent of magnesium element, 2 percent of zinc element, 0.4 percent of copper element, 0.75 percent of nickel element, 0.75 percent of tin element, 0.15 percent of titanium element, 0.15 percent of iron element, 0.15 percent of chromium element and the balance of aluminum element. In the embodiment, the front connecting piece 2 is prepared by adopting the aluminum alloy material with the proportion, so that the advantages of all components are fully exerted, the effects of improving the advantages and avoiding the disadvantages are achieved, the energy absorption effect of the front connecting piece 2 is further improved, the energy absorption effect of the front connecting piece 2 when small offset collision occurs is improved, and the safety of passengers is further protected.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.