CN112158157A

CN112158157A - Double-central-support-leg tubular beam and forming method thereof

Info

Publication number: CN112158157A
Application number: CN202010814640.1A
Authority: CN
Inventors: 刘海龙; 王秋峰; 高朋飞; 李阳扶; 周万山
Original assignee: Lingyun Southwest Industrial Co ltd
Current assignee: Lingyun Southwest Industrial Co ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-01-01

Abstract

The invention provides a double-center-support-leg tubular beam which comprises a hollow beam, wherein the cross section of the hollow beam is a quadrilateral beam which is enclosed by two long sides and two short sides, the middle part of one long side is sunken towards the inside of the hollow beam to form a sunken part with one side opened and one side raised, the raised end of the sunken part is fixedly connected with the other long side, two side walls of the sunken part form supports in the hollow beam and divide the hollow beam into two independent chambers, and the long side of the opening end of the sunken part is provided with a lap joint wall for closing the opening. The invention adopts an integral structure, so that the structure is lighter and more stable; the connecting fixing points are protected, and damage caused by direct impact is prevented; meanwhile, a method for forming the double-center-support-leg tubular beam is disclosed, so that the continuous forming of the double-center-support-leg tubular beam is ensured.

Description

Double-central-support-leg tubular beam and forming method thereof

Technical Field

The invention relates to the field of automobiles, in particular to a double-center-supporting-leg tubular beam for an automobile anti-collision beam and a forming method thereof.

Background

Modern automotive impact beam systems include reinforcing beams that are typically designed for their strength and impact resistance characteristics to meet government and insurance industry standards for a particular vehicle, but are also designed to minimize overall vehicle weight, maximize strength to weight ratio, fit within a limited vehicle mounting space, and meet the aesthetic and functional requirements of the vehicle at both the front and rear ends of the vehicle. At the same time, the process and method of manufacturing the beams preferably minimizes unwanted product dimensional and quality variations, while minimizing manufacturing costs, optimizing manufacturability, and minimizing scrap. The roll-forming process and method have proven to be particularly effective at providing mass-produced reinforced beams for impact beams at competitive prices and with high dimensional consistency. However, industry is so competitive that even small improvements can be important.

Furthermore, many of the above desirable features are contradictory, making it unclear how to modify a particular impact beam reinforcement beam, or how to modify the roll-forming process used to make the beam. For example, a heavier beam may be stronger, but may result in an unacceptable increase in vehicle weight. High strength materials are expensive, difficult to form and result in high die wear. The positional control of the sheet metal edges during the roll-forming process is precise so that the beam has a precise cross-sectional shape to reduce edgewise tolerances, to minimize beam weight, and to facilitate butt-joint accuracy during welding. However, this requires additional roll forming steps, as well as additional tooling and hardware and software controls, which all require increased capital investment and further complicate the roll forming process.

Chinese patent publication No. CN103221266B, which discloses a tubular beam with a single central leg, describes "a reinforced beam comprising a beam formed from a single sheet of metal and comprising a first tube and a second tube which share a common wall and have a front wall and a rear wall aligned coplanar, each front wall comprising a channel rib therein", with the common wall forming a single leg supporting the respective front and rear walls. When the structure is impacted, the first pipe and the second pipe on the two sides are not supported and protected, and the welding seam is torn due to possible deformation, so that the pipe beam is deformed and loses effect.

Chinese patent publication No. CN206436960U discloses a front impact beam for a vehicle, "constructed as a single piece by roll forming, in which a front member has two recesses for mounting reinforcing bars on one face. Due to roll forming, the middle of the cross section is the weld of the closed structure. And three cavities on the other side of the cross-section. The third cavity is positioned between the first cavity and the second cavity and is connected with the first cavity and the second cavity, and the longitudinal extension piece of the second cavity is just contacted with or close to the welding position, so that the structural strength of the welding position can be enhanced by the second cavity, the B-shaped front wall is arranged towards the front of the vehicle, and the opening formed by the third longitudinal extension piece faces the rear of the vehicle, so that the contact area of the front collision beam structure and a collision object in collision is increased, the bending resistance of the front collision beam structure is enhanced, and in the actual use process, because the welding seam is positioned in the front, no protective measures are provided, the impact can be directly caused to the welding seam when the impact occurs, and the damage to the welding seam is large; in addition, the third cavity, namely the opening in the middle of the B-shaped structure is of a semi-closed structure, and the semi-closed structure is required to be connected with a vehicle body to form a closed structure.

To the above problems, it is necessary to design an integrated double center leg tubular beam for an automobile anti-collision beam, which satisfies the requirement of light weight while maintaining stability.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a double-center supporting leg tubular beam which adopts an integral structure, so that the structure is lighter and more stable; when the anti-collision device is used for an automobile anti-collision beam, the connection fixing points are protected, and damage caused by direct impact is prevented; meanwhile, a method for forming the double-center-support-leg tubular beam is disclosed, so that the continuous forming of the double-center-support-leg tubular beam is ensured.

The invention is realized by the following technical scheme:

the invention provides a double-center-leg tubular beam, which comprises a hollow beam, wherein the cross section of the hollow beam is a quadrilateral beam formed by enclosing two long sides and two short sides, the middle part of one long side is sunken towards the inside of the hollow beam to form a sunken part with one side opened and one side raised, the raised end of the sunken part is fixedly connected with the other long side, two side walls of the sunken part form supports in the hollow beam and divide the hollow beam into two independent chambers, and the long side of the open end of the sunken part is provided with a lapping wall for closing the opening.

Further, the double-center-leg pipe beam is structurally characterized in that the hollow beam is formed by continuously rolling a metal plate, a first bulge is formed by rolling the middle part of the metal plate to the edge of one side, a straight line section is formed by rolling the middle part of the metal plate to the other side, a second bulge is formed by rolling the straight line section of the metal plate close to the edge, a concave part is formed on the straight line section by the second bulge, two bending sections are formed by rolling and bending the straight line section of the second bulge to the middle part of the metal plate, the first bending section is perpendicular to the straight line section to form a short edge, and the second bending section is perpendicular to the first bending section, so that the top of the second bulge is fixedly connected with; the first bulge is composed of a vertical section and a horizontal section, wherein the vertical section is vertical to the linear section to form another short side; the straight line section between the vertical section of the first protrusion and the first bending section forms the other long side.

Furthermore, the bottom of the second protrusion and the position of the second bending section are symmetrical to form a supporting bending section, and the supporting bending section is fixedly connected with the horizontal section of the first protrusion.

The double-center-leg tubular beam is of an integral structure formed by continuously forming metal plates, the force applied to the linear section serving as an impact surface can be borne by the supporting structure formed by the whole second bulge and is dispersed to all parts of the supporting structure, and the deformation caused by local impact can be avoided; the impact force is well transmitted and buffered, and the direct impact of the support structure on the long edge is reduced, so that the damage caused by the connecting part is avoided; the metal plate is generally made of a high-strength steel plate or a novel high-strength light synthetic material, and is used for reducing the weight of the double-center-support-leg pipe beam and realizing the light weight of an automobile structure.

Further, the double-center-leg tubular beam has the following specific structure: the hollow beam is formed by continuously rolling a metal plate, a first bulge is formed from the middle part of the metal plate to one side edge of the metal plate in a rolling mode, a straight line section is formed from the middle part of the metal plate to the other side of the metal plate, a second bulge symmetrical to the first bulge is formed from the straight line section of the metal plate close to the edge in a rolling mode, a four-section bending section is formed from the first bulge and the second bulge to the straight line section of the middle part of the metal plate in a rolling and bending mode, the first bending section is perpendicular to the straight line section to form a short edge, the second bending section is perpendicular to the first bending section, the third bending section is perpendicular to the second bending section, the fourth bending section is perpendicular to the third bending section and is fixedly connected with the straight line section after being attached to the straight line section, a concave part is formed between; and the two second bending sections are estimated to be connected with another metal plate for sealing the concave part, a straight line section between the first bulge and the second bulge forms a long edge, and the other metal plate and the two second bending sections form another long edge. Perfect symmetry is realized to this structure to set up the welding seam of main load-bearing part inside two central landing leg tubular beams, have certain guard action to the welding seam, strengthened the shock resistance and the security performance of anticollision roof beam.

The invention provides a method for forming a tubular beam with double central legs, wherein a metal plate is uncoiled and leveled;

rolling, wherein a first bulge is formed from the middle part to one side edge of the metal plate in a rolling way, a straight line section is formed from the middle part to the other side of the metal plate, a second bulge is formed from the edge of the straight line section of the metal plate close to the edge in a rolling way, a concave surface is formed on the straight line section by the second bulge, two sections of bending sections are formed from the second bulge to the straight line section in the middle part of the metal plate in a rolling and bending way, the first bending section is vertical to the straight line section, the second bending section is vertical to the first bending section; the first bulge is composed of a vertical section and a horizontal section, wherein the vertical section is vertical to the linear section, and the tail end of the horizontal section is tightly attached to the second bending section;

welding, namely welding the joint of the top of the second bulge and the straight line section; welding the joint of the horizontal section and the second bending section to form a continuous beam with a quadrangular cross section;

and cutting, namely feeding the continuous beam into cutting equipment, and cutting according to the required length to form the double-center-leg tubular beam.

The method realizes the continuous molding of the double-center supporting leg pipe beam and ensures the strength of the double-center supporting leg pipe beam. Meanwhile, the roll forming process and method are suitable for mass production, the cost is low, and the produced product has high dimensional consistency and the price is advantageous.

In a third aspect of the invention, an automobile anti-collision beam is provided, and the double-center-leg tubular beam is adopted. The anti-collision beam arranges the welding line to one side far away from the impact surface, so that the direct impact on the welding line is avoided, and meanwhile, the welding line is arranged at a non-main stressed position, so that the impact resistance of the anti-collision beam is further improved; meanwhile, the shape of the anti-collision beam is adaptively adjusted according to the shape of the vehicle body so as to adapt to the use of the vehicle. The integral structure enables the impact force to be well transmitted and buffered, so that damage to the vehicle body connecting part is avoided.

The invention provides an application of the double-center-leg tubular beam forming method to an automobile anti-collision beam.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of a first embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structure of a second embodiment of the present invention.

Fig. 3 is a schematic cross-sectional structure of a third embodiment of the present invention.

Fig. 4 is a schematic cross-sectional structure diagram of a fourth embodiment of the present invention.

Fig. 5 is a schematic flow chart of a method for forming a double center leg tubular beam according to a first embodiment of the present invention.

The reference numbers are as follows:

101. a first wall; 102. a second wall; 103. a third wall; 104. a fourth wall; 201. a first side wall; 202. a second side wall; 203. supporting legs; 301. a first support wall; 302. a second support wall; 303. a third support wall; 401. a first tube; 402. a second tube; 403. a third tube; 404. a support leg; 501. and (4) ribs.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 to 4, the invention provides a double-center-leg tubular beam, which comprises a hollow beam, wherein the cross section of the hollow beam is a quadrangular beam surrounded by two long sides and two short sides, the middle part of one long side is sunken towards the inside of the hollow beam to form a sunken part with one side opened and one side raised, the raised end of the sunken part is fixedly connected with the other long side, two side walls of the sunken part form a support in the hollow beam and divide the hollow beam into two independent chambers, and the long side of the opening end of the sunken part is provided with a lap joint wall for closing the opening. Wherein two short sides are respectively defined as a first side wall 201 and a second side wall 202, two side walls of the concave portion are respectively defined as a first supporting wall 301 and a third supporting wall 303, and the convex end is defined as a second supporting wall 302; the long side fixedly connected to the protruding end is defined as a first wall 101 and the overlapping wall closing the opening is defined as a fourth wall 104.

In a first embodiment of the present invention, as shown in fig. 1, a double center-leg tubular beam, which may be used for an automobile impact beam, includes a hollow beam continuously formed using a metal plate, and the hollow beam cross-sectional structure includes: the supporting structure comprises a first wall 101 formed by the metal plate, a first side wall 201 and a second side wall 202, wherein the first side wall 201 and the second side wall 202 are formed by extending two ends of the first wall 101 to the same side of the first wall 101 and are perpendicular to the first wall 101, the first side wall 201 extends to the middle of the first wall 101 and is bent to form a second wall 102 and a supporting structure, the supporting structure comprises a first supporting wall 301, a second supporting wall 302 and a third supporting wall 303 which are continuous and adjacent and are perpendicular to each other, and the second supporting wall 302 is tightly attached to the first wall 101; the second side wall 202 is bent and extended towards the second wall 102 to form a fourth wall 104 and is welded with the second wall 102, and the third supporting wall 303 is welded with the fourth wall 104; the hollow beam is caused to assume three adjacent tubular structures comprising a first tube 401, a second tube 402 sharing a first support wall 301 with the first tube 401, and a third tube 403 sharing a third support wall 303 with the second tube 402. Generally, the centerline position of the second support wall 302 corresponds to the centerline position of the first wall 101.

This embodiment forms a support structure with a U-shaped structure inside, the walls of the U-shaped structure being perpendicular to each other. Generally, the first wall 101 serves as an impact receiving surface; and the opening of U-shaped structure links firmly through fourth wall 104, can further guarantee bearing structure's stability, avoids the bearing structure deformation that central authorities' local impact arouses.

In this embodiment, the cross section formed by the first wall 101, the first sidewall 201, the second sidewall 202, the second wall 102 and the fourth wall 104 is quadrilateral. Generally, the overall appearance structure is approximately rectangular, but when the structure is used on a vehicle body, the structures of the fourth wall 104 connected with the vehicle body and the second wall 102 parallel to the fourth wall 104 are adjusted according to the shape of the external structure of the vehicle body, and a circular arc or other structures matched with the outline of the vehicle body can be arranged.

In this embodiment, the bending portions of the metal plates are all set to be in fillet transition. On one hand, the roller forming can be facilitated, on the other hand, the buffering effect can be achieved, and in addition, fatigue fracture can be avoided when the stress of the bending portion is concentrated.

In this embodiment, one rib 501 is disposed on the first wall 101 corresponding to the first tube 401 and the third tube 403, and the two ribs 501 are parallel to each other. The rib 501 is in the shape of a groove recessed into the first wall 101 and extends in the axial direction of the hollow beam. The ribs 501 may function as reinforcing ribs and may also function as positioning features when connected to the vehicle body.

In the second embodiment of the present invention, as shown in fig. 2, a supporting leg 203 extending toward the second side wall 202 is disposed at the end of the third supporting wall 303, and the supporting leg 203 is disposed closely to the fourth wall 104 and is fixedly connected to the fourth wall 104. The fourth wall 104 covers a part of the second wall 102, and the length of the cover corresponds to the length of the supporting feet 203. The part can be used as an extension section of the supporting structure, so that impact force is well transmitted and buffered, and direct impact of the first supporting wall 301 and the third supporting wall 303 on the fourth wall 104 is reduced, so that damage to a vehicle body connecting part is avoided.

For the above two embodiments of the present invention, a derivative embodiment is also proposed as a third embodiment.

In a third embodiment, as shown in fig. 3, the supporting structure is provided with a plurality of tubes, which are continuously arranged in a linear array between the first side wall 201 and the second side wall 202, the third tube 403 formed by the previous supporting structure is the first tube 401 of the next supporting structure, the second tubes 402 formed by the adjacent supporting structures are the same size, and at least one rib 501 is provided on the first wall 101 corresponding to each first tube 401 and each third tube 403. This embodiment can be applied to protective devices with large impact surfaces, such as crash barriers and the like.

In a fourth embodiment of the present invention, as shown in fig. 4, a double center leg tubular beam for an automobile impact beam includes a hollow beam formed using a metal plate, and the hollow beam cross-sectional structure includes: the first wall 101 formed by the metal plate, and the first sidewall 201 and the second sidewall 202 which are perpendicular to the first wall 101 and formed by extending two ends of the first wall 101 to the same side of the first wall 101, wherein the first sidewall 201 extends to the middle of the first wall 101 and is bent to form the second wall 102 and a supporting structure, the second sidewall 202 extends to the middle of the first wall 101 and is bent to form the third wall 103 and another supporting structure, and the two supporting structures have the same structure and are symmetrical to each other; the support structure comprises a first support wall 301/a third support wall 303 perpendicular to the second wall 102/the third wall 103, one end of each of the first support wall and the third support wall 303 close to the first wall 101 is provided with a support leg 404 closely attached to the first wall 101, and the two support legs 404 are welded in the middle of the first wall 101; a fourth wall 104 is overlapped between the second wall 102 and the third wall 103, and both ends of the fourth wall 104 are welded to the second wall 102 and the third wall 103, respectively. The structure of the embodiment realizes perfect symmetry, and the welding line of the main bearing part is arranged inside the double-center supporting leg pipe beam, so that the welding line has a certain protection effect, and the impact resistance and the safety performance of the anti-collision beam are enhanced.

In view of the first embodiment of the present invention, a method for forming a double center leg tubular beam is provided, which mainly uses a roll forming method to process the double center leg tubular beam in the first embodiment, and includes the following steps, as shown in fig. 5:

selecting a proper steel plate structure, wherein the thickness is generally required to be 0.8mm to 3.0mm, the tensile strength is about 400 MPa to 2000MPa, the steel plate is of a rectangular structure and has enough length, and the steel plate is divided into a first section to an eighth section by scribing on the steel plate along the long side of the rectangle, wherein the sixth section is a central section, and the two short sides of the rectangle are used as a first edge and a second edge;

respectively bending the first section to the third section along the segmentation points by using a roller press, and then gradually forming the shape of the support structure, wherein the bending of the sections is performed simultaneously; the corresponding relation is that the first section corresponds to the third supporting wall 303, the second section corresponds to the second supporting wall 302, and the third section corresponds to the first supporting wall 301; as in steps 1-6 of fig. 5;

then bending the fourth section and the fifth section in sequence to form a second wall 102 and a first side wall 201 respectively, and enabling a second supporting wall 302 of the supporting structure to be tightly attached to the central section; see steps 7-31 in FIG;

forming an inward recessed rib 501 on the sixth section, wherein the rib 501 extends longitudinally along the sixth section; it is possible to pre-draw the positions of the ribs 501, typically two and parallel to the segmentation line, on the sixth segment according to the calculated size;

welding the second support wall 302 to the central section; typically after step 31, spot welding is used for shaping.

Bending the seventh section and the eighth section by another roller press to form a second sidewall 202 and a fourth wall 104 respectively, and tightly attaching the fourth wall 104 to the ends of the second wall 102 and the third supporting wall 303; as in steps 7-40 of fig. 5; the first half of this step, steps 7-31, and the application of the recessed feature to the first wall 101 may be performed simultaneously;

welding the first and second edges to the corresponding second and

fourth walls

102 and 104, respectively; laser welding is generally used here, where two laser beams are used to simultaneously irradiate the welding plane. The laser welding can be selected to be continuous or intermittent according to the product requirement.

Wherein, each bending point forms a round angle when bending, and the basic shape of the beam is maintained when welding, thereby preventing the deformation caused by welding.

In this method, before the first to third segments are bent to form the shape of the support structure, the sixth segment may be formed into a shape that is arc-shaped or that matches the outer contour of the vehicle body, and the fourth and eighth segments may be formed into a structural shape that corresponds to the fourth segment.

For the second embodiment of the present invention, the method needs that the selected steel plate material further needs to include a ninth section, the ninth section is located at an edge of the first section close to the short side of the rectangle, and when the first section to the fourth section are bent to form the support structure correspondingly, the ninth section is bent to form a portion perpendicular to the first section, so as to form the support leg 203 with a U-shaped structure.

For the third embodiment of the present invention, the steel plate material selected for the method further includes spare segments at the edge of the first segment, and the spare segments are used for forming a continuous support structure distributed in a linear array.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a two central landing leg tubular beams, its characterized in that, includes hollow beam, hollow beam is by the transversal tetragonal roof beam of personally submitting that two long limits and two minor faces enclose, and the middle part on one of them long limit is sunken to hollow beam inside and is formed an opening, the bellied depressed part of one side, and the protruding end and another long limit fixed connection at depressed part, the both sides wall at depressed part form in hollow beam and support and separate into two independent cavities with hollow beam, is provided with on the long limit of depressed part open end and seals open-ended overlap joint wall.

2. The dual center leg tubular beam of claim 1, wherein the convex end of the recessed portion is parallel to the long side and the sidewalls of the recessed portion are perpendicular to the long side.

3. The double-center-leg tubular beam as claimed in claim 2, wherein the hollow beam is formed by continuously rolling a metal plate, a first protrusion is formed by rolling the middle part of the metal plate to one side edge, a straight line part is formed by rolling the middle part of the metal plate to the other side, a second protrusion is formed by rolling the straight line part of the metal plate close to the edge, a concave part is formed on the straight line part by the second protrusion, two bending sections are formed by rolling and bending the straight line part of the second protrusion to the middle part of the metal plate, the first bending section is perpendicular to the straight line part to form a short edge, and the second bending section is perpendicular to the first bending section, so that the top of the second protrusion is fixedly connected with the straight line part after being; the first bulge is composed of a vertical section and a horizontal section, wherein the vertical section is vertical to the linear section to form another short side; the straight line section between the vertical section of the first protrusion and the first bending section forms the other long side.

4. The tubular beam with double center legs as claimed in claim 3, wherein the bottom of the second protrusion and the second bending section are symmetrically arranged to form a support bending section, and the support bending section is fixedly connected with the horizontal section of the first protrusion.

5. The double-center-leg tubular beam as claimed in claim 2, wherein the hollow beam is formed by continuously rolling a metal plate, a first protrusion is formed by rolling the middle part of the metal plate to one side edge, a straight line part is formed by rolling the middle part of the metal plate to the other side, a second protrusion symmetrical to the first protrusion is formed by rolling the straight line part of the metal plate close to the edge, a four-section bending section is formed by rolling and bending the straight line part of the first protrusion and the straight line part of the second protrusion to the middle part of the metal plate, the first bending section is perpendicular to the straight line part to form a short edge, the second bending section is perpendicular to the first bending section, the third bending section is perpendicular to the second bending section, the fourth bending section is perpendicular to the third bending section and is fixedly connected with the straight line part after being attached to the straight line part, so that a concave part is formed between the two third bending sections, and the; and the two second bending sections are estimated to be connected with another metal plate for sealing the concave part, a straight line section between the first bulge and the second bulge forms a long edge, and the other metal plate and the two second bending sections form another long edge.

6. A double center leg tubular beam as in claim 3 or 5 wherein said straight section is provided with at least one rib on each side of said recessed portion, said ribs being parallel to each other.

7. The double center leg tubular beam of claim 6, wherein the ribs comprise circular arc shaped grooves recessed into the straight sections and extending in the axial direction of the hollow beam.

8. A double center leg tubular beam as in claim 3 or 5 wherein the fixed connection is a weld.

9. An automotive impact beam, characterized in that it comprises a double center leg tubular beam according to any one of claims 1 to 8.

10. A method for forming a double-center-leg tubular beam is characterized by comprising the following steps:

uncoiling and leveling a metal plate;

11. The method as claimed in claim 10, wherein the method further comprises punching holes after uncoiling and flattening the metal plate, wherein the holes are used for forming the cutting positioning points.

12. The method of claim 10, wherein rolling comprises forming the second protrusion, bending the first protrusion and the second protrusion toward the straight section, and engaging the horizontal section of the second protrusion with the first protrusion.

13. The method for forming a tubular beam with two center legs as claimed in claim 12, wherein the top of the second protrusion is welded for the first time when being attached to the straight line section; and performing second welding when the tail end of the horizontal section of the first bulge is tightly attached to the second bending section.

14. The method as claimed in claim 12, wherein the first protrusion is formed by rolling, and then two bending sections are formed to make the top of the second protrusion fit the straight section.

15. Use of a method of forming a double center leg tubular beam according to any one of claims 10 to 14 in an automotive impact beam.

16. A guard comprising a double center leg tubular beam as claimed in any one of claims 1 to 8.