Integrated inner and outer plate doorsill beam and processing method thereof

Abstract

The invention provides an integrated inner and outer plate doorsill beam. The doorsill beam is a closed cavity formed by bending a plate for multiple times; the doorsill beam comprises an inner beam and an outer beam which are oppositely arranged in a buckled mode, a first bent flange edge and a second bent flange edge are arranged at the connecting position of the inner beam and the outer beam respectively, and the first bent flange edge is formed by symmetrically bending a plate by 180 degrees. The product provided by the invention has the advantages of high strength and good energy absorption effect, and meets the requirement of light weight, so that the profile has sufficient rigidity and bending strength. The invention further provides a machining method of the integrated inner and outer plate doorsill beam structure, rolling and repeated bending forming are adopted, and the machining difficulty is low; the traditional split type processing mode of the inner plate and the outer plate of the doorsill and the offline welding processing procedure are abandoned; and one set of rolling die is input at a time to perform cold bending on one steel plate to form the inner and outer plate doorsill beam, so that the die input cost is reduced, the offline processing procedures are reduced, and the working efficiency and the productivity are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile profiles, and in particular to an integrated inner and outer panel door sill beam and a processing method thereof. Background Art

[0002] With the popularization of the automobile industry, people are paying more and more attention to the safety performance of automobiles. The safety performance of automobile safety protection systems is particularly important, especially various safety structural parts that have an important impact on automobile safety performance, such as automobile anti-collision beams, battery side beams, inner and outer panel threshold beams, etc. The main function of these safety structural parts is to enhance the strength of the car, absorb impact force, and reduce the personal injury to drivers and passengers during a car collision. Therefore, in order to improve the safety performance of the car body, it is necessary to continuously improve and develop a high-energy-absorbing, high-strength, and lightweight safety structural part while ensuring product quality.

[0003] As an important safety component of the car, the inner and outer panel sill beams can prevent the car from deforming and invading the cockpit, and play a vital role in protecting the safety of people and property during a side collision of the car. In the application of new energy vehicles, the inner and outer panel sill beams also protect the battery pack, prevent deformation and fire; the inner and outer side beams of the battery shell are mostly made of extruded aluminum alloy profiles, with high material processing costs and low product strength, resulting in insufficient side collision performance of the whole vehicle. In the application of fuel vehicles, the inner and outer panel sills are mostly made of high-strength steel sheet metal stamping and roll forming. Limited by the process limit, no matter which method is used, the inner and outer panels of the sill are processed in a split manner, and finally assembled and welded into one. The whole process has high mold development costs and complex processing procedures; especially the sheet metal stamping process, the product weight is large, the process is complex, and the material utilization rate is low. Due to the demand of enterprises for cost control in pursuit of benefits, how to improve the processing technology of the inner and outer panel sill beams, and achieve cost reduction and efficiency improvement under the premise of ensuring safety performance, has become an important problem that needs to be solved urgently. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, an object of the present invention is to provide an integrated inner and outer panel door sill beam.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A one-piece inner and outer panel threshold beam, the threshold beam is a closed cavity formed by a plate through multiple bending steps; the threshold beam is composed of an inner beam and an outer beam that are relatively buckled, and a first bending flange edge and a second bending flange edge are respectively arranged at the connection between the inner beam and the outer beam, and the first bending flange edge and the second bending flange edge are both double-layer stacked edges; the first bending flange edge is formed by symmetrically bending the plate itself by 180°, and the length of the first bending flange edge is not less than 4 times the thickness of the plate material, and the second bending flange edge is formed by welding after the two ends of the plate are parallelly fitted.

[0006] A further improvement of the present invention is that the outer beam includes a second bent outer edge, an outer beam upper wall, an outer beam side wall, an outer beam lower wall and a first bent outer edge; the inner beam includes a second bent inner edge, an inner beam upper wall, an inner beam side wall, an inner beam lower wall and a first bent inner edge; the first bent inner edge and the first bent outer edge are stacked and formed to form a first bent flange edge, and the second bent inner edge and the second bent outer edge are welded after being fitted to form a second bent flange edge.

[0007] The further improvement of the present invention is that the angle between the upper wall of the outer beam and the upper wall of the inner beam, and the angle between the lower wall of the outer beam and the lower wall of the inner beam are not less than 120°; the side walls of the inner beam and the side walls of the outer beam are flat or special-shaped to meet the boundary conditions of the automobile manufacturer.

[0008] The processing method of the integrated inner and outer panel threshold beam specifically comprises the following steps: S1. Uncoiling, leveling and pre-punching the sheet; S2, locally softening the pre-leveled plate, where the softened position corresponds to the rounded corner position of the first bending flange edge; S3, sending the softened steel strip to the second leveling machine for leveling again; S4, sending the leveled plate into the cold bending forming unit, completing the first bending flange edge through multiple forming steps; continuing to bend multiple times to complete the forming of the second bending flange edge, and finally welding the second bending flange edge to form a closed cavity; S5. According to the required length, cut and cut the rolled profile to a fixed length to obtain an integrated inner and outer panel threshold beam.

[0009] In step S2, the local softening treatment of the plate is performed before the secondary leveling. The local softening treatment of the plate includes two steps of heating and cooling, so as to enhance the ductility and tensile strength of the plate.

[0010] A further improvement of the present invention is that the heating treatment of the local softening treatment adopts laser heating, and the cooling treatment adopts spray cooling.

[0011] In step S4, the cold bending forming of the plate includes four stages: In the first stage, the first bending flange is symmetrically bent to make the sheet material symmetrically bent 180°; In the second stage, the angles of the second bent flange edges on both sides of the sheet end are first formed to the position, and then the rounded corners of the upper wall of the outer beam / the upper wall of the inner beam are formed to form the upper wall of the outer beam / the upper wall of the inner beam; In the third stage, the outer beam side wall / inner beam side wall is formed by bending the fillets of the lower walls on both sides for multiple times, and finally the second bent outer edges / second bent inner edges on both sides of the sheet end are parallelly fitted, and then welded to form a closed roll-formed profile; In the fourth stage, more precise cross-section accuracy control is performed through the sizing unit.

[0012] In the third stage of step S4, arc welding or fusion welding is used for welding between the second bend outer edge and the second bend inner edge.

[0013] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is: The invention discloses an integrated inner and outer door panel sill beam structure, which has high strength, good energy absorption effect, and meets lightweight requirements. The profile structure has sufficient rigidity and bending strength, and can meet the anti-collision performance requirements of the sill beam.

[0014] The threshold beam of the present invention is formed by buckling an inner beam and an outer beam, and the connection between the inner beam and the outer beam is connected by a first bent flange edge and a second bent flange edge. The first bent flange edge is formed by bending the plate 180 degrees. Generally speaking, the split welding process requires the side length of the welding process to be ≥14mm; while the roll bending forming method only requires a length of not less than 4 times the material thickness, for example, the conventional material thickness is 1~2mm, so the flange length is not less than 4~8mm, so the plate consumption is significantly reduced, which greatly saves raw materials.

[0015] The integrated inner and outer door sill beams of the present invention are formed by roll bending of a piece of steel plate, and have higher section strength; the split welded inner and outer plate door sill beams adopt a discontinuous spot welding process, and the strength of the unwelded position is significantly reduced; and the integrated forming process significantly improves the shear strength of the door sill beam cross section.

[0016] The present invention also provides a method for processing an integrated inner and outer panel threshold beam structure, wherein the pre-leveled plate is locally heated and cooled by unwinding and pre-straightening the steel strip, and a local softening treatment can also be performed before any pass before the first folded flange edge is formed; the softened steel strip corresponds to the rounded corner position of the first folded flange edge; the steel strip is fed into a second leveling machine for steel strip leveling; then pre-punching, cold bending, welding, and cutting to size are performed; the present invention adopts roller forming to achieve multiple bending and forming of the plate, and the processing difficulty is low; the traditional split processing method of the inner and outer panels of the threshold and the offline welding processing steps are abandoned; and a one-time investment of a set of roller pressing molds is used to cold-bend a steel plate to form the inner and outer panel threshold beams, thereby reducing the mold investment cost and reducing the offline processing steps, greatly improving the work efficiency and production capacity.

[0017] For conventional split inner and outer panel threshold beams, it is necessary to develop two sets of rolling dies and offline welding fixtures at the same time, which results in a long process flow, high processing cost and low effectiveness. However, the integrated inner and outer panel threshold beam of the present invention only requires the development of one set of rolling tooling and is processed by an automated roller stamping and welding production line. Closed welding and other processes can be completed online, saving processes and reducing processing costs.

[0018] During the processing of the threshold beam, the rounded corners of the folded flange are softened first to reduce the risk of cracking. Depending on the type of steel, the temperature can be heated to between 600℃ and 800℃. Real-time temperature monitoring and cooling devices can be used to control local excessive temperatures to avoid damage to the mold, or air cooling can be used until the roll forming is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross section of the inner and outer plate threshold beams of the present invention; Figure 2 It is a schematic diagram of the cross section of the inner and outer sill beams with irregularly shaped outer beam side walls; Figure 3 It is a schematic diagram of the cross-section of the inner and outer sill beams with energy absorption zones on the outer beam side walls; Figure 4 for Figure 1 The schematic diagram of the forming process flow of the threshold beam is shown; Figure 5 This is a schematic diagram of the local softening treatment area during the processing of the integrated inner and outer panel sill beam; Figure 6 It is the connection diagram of the integrated inner and outer panel threshold beam processing production line; Figure 7 It is a schematic diagram of the integrated inner and outer panel threshold beam processing production line; Figure 8 It is a top view structural schematic diagram of the local softening mechanism; Fig. 9 It is a schematic diagram of the front view structure of the local softening mechanism; In the figure, 1-1, the outer edge of the second bend, 1-2, the upper wall of the outer plate, 1-3, the side wall of the outer beam, 1-4, the lower wall of the outer plate, 1-5, the outer edge of the first bend, 1-6, the inner edge of the first bend, 1-7, the lower wall of the inner plate, 1-8, the side wall of the inner plate, 1-9, the upper wall of the inner plate, 1-10, the inner edge of the second bend, 1-11, the energy absorption zone, 1-12, the welding point, 2. Steel belt, 2-1. Local softening treatment area, 3. Feed guide wheel, 4. Feed clamping wheel, 5. Heating probe, 6. Cooling nozzle, 7. Discharge clamping wheel, 8. Discharge guide wheel, 10. Uncoiler, 20. First leveling machine, 30. Local softening mechanism, 40. Second leveling machine, 50. Punching mechanism, 60. Servo feeding mechanism, 70. Missing punching detection mechanism, 80. Pit bridge, 90. Cold bending forming unit, 100. Welding mechanism, 110. Cutting mechanism, 120. Material receiving mechanism. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0021] An integrated inner and outer panel threshold beam, such as Figure 1 As shown, a closed cavity is formed by a plate through multiple bending and then welding. The threshold beam includes an inner beam and an outer beam, both of which are U-shaped beam structures, and the two are relatively buckled to enclose an internal cavity. The two connecting parts of the inner beam and the outer beam are connected by a first bending flange edge and a second bending flange edge respectively. The first bending flange edge and the second bending flange edge are both double-layer stacked edges, wherein the first bending flange edge is formed by symmetrically bending the plate itself by 180°, and the second flange edge is formed by welding after the two ends of the plate are parallelly fitted.

[0022] Specifically, the outer beam includes a second bent outer edge 1-1, an outer beam upper wall 1-2, an outer beam side wall 1-3, an outer beam lower wall 1-4 and a first bent outer edge 1-5, and the inner beam includes a second bent inner edge 1-10, an inner beam upper wall 1-9, an inner beam side wall 1-8, an inner beam lower wall 1-7 and a first bent inner edge 1-6. The first bent inner edge 1-6 and the first bent outer edge 1-5 are stacked and formed to form a first bent flange edge; the second bent inner edge 1-10 and the second bent outer edge 1-1 are welded after being bonded to form a second bent flange edge.

[0023] The first bending inner edge 1-6, the first bending outer edge 1-5, the second bending inner edge 1-10, and the second bending outer edge 1-1 are arranged in parallel. Figure 1 In the illustrated embodiment, the first bend inner edge 1-6, the first bend outer edge 1-5, the second bend inner edge 1-10, and the second bend outer edge 1-1 are all arranged vertically.

[0024] The inner beam side wall 1-8 and the outer beam side wall 1-3 are flat or have a special shape to meet the boundary conditions of the automobile manufacturer. Figure 1 As shown, the inner beam side wall 1-8 and the outer beam side wall 1-3 are both vertical planes. In practical applications, the inner beam side wall 1-8 and the outer beam side wall 1-3 are often not planar, but are special-shaped formed by connecting multiple ribs, such as Figure 2As shown. The specific shapes of the inner beam side wall 1-8 and the outer beam side wall 1-3 are adjusted according to the boundary conditions of the automobile manufacturer so that they fully fit the external structure. It should also be noted that the inner beam side wall 1-8 and the outer beam side wall 1-3 are independent of each other, and their shapes can be the same or different.

[0025] According to the actual anti-collision performance requirements, the outer beam side wall 1-3 may also be provided with an energy absorption area 1-11, such as Figure 3 The shape and structure of the energy absorption zone 1-11 can be adjusted according to the boundary conditions of the automobile manufacturer, and no mandatory limitation is made here.

[0026] Reinforcing ribs, such as U-shaped ribs, may also be provided on the inner beam side walls 1-8 and the outer beam side walls 1-3 to increase the strength of the door sill.

[0027] Similarly, the outer beam upper wall 1-2, the outer beam lower wall 1-4, the inner beam upper wall 1-9, and the inner beam lower wall 1-7 can be horizontal or inclined. When the outer beam upper wall 1-2, the outer beam lower wall 1-4, the inner beam upper wall 1-9, and the inner beam lower wall 1-7 can be horizontal, the inner and outer board threshold beams are rectangular. But generally speaking, the outer beam upper wall 1-2, the outer beam lower wall 1-4, the inner beam upper wall 1-9, and the inner beam lower wall 1-7 are preferably inclined, which can better fit the external structure, reduce stress dead angles, and enhance support performance.

[0028] The angles of the inner and outer panel sill beams are all rounded, and it is particularly emphasized that the connection between the first bend outer edge 1-5 and the first bend inner edge 1-6 is a 180° rounded angle, which reduces stress points and increases anti-collision performance.

[0029] Further preferably, the angle between the upper wall 1-2 of the outer beam and the upper wall 1-9 of the inner beam, and the angle between the lower wall 1-4 of the outer beam and the lower wall 1-7 of the inner beam are not less than 120°.

[0030] The shapes of the inner beam and the outer beam can be the same or different, and their shapes can be adjusted according to the arrangement of components of the vehicle body.

[0031] The length of the first bending flange is not less than 4 times the material thickness, and the length is preferably 4-8 mm. The length of the second bending flange is usually not less than 14 mm / the length of the first bending flange. That is, when the length of the sill flange meets the vehicle body boundary conditions, it is generally designed to be not less than 14 mm; when the vehicle body boundary conditions do not allow, the length of the second bending flange can also be appropriately shortened to meet the requirements of online welding.

[0032] The present invention also provides a method for processing an integrated inner and outer panel sill beam, which specifically comprises the following steps: S1. Uncoiling, leveling and pre-punching the sheet; S2, locally softening the pre-leveled plate, where the softened position corresponds to the rounded corner position of the first bending flange edge; S3, sending the softened steel strip to the second leveling machine for leveling again; S4, sending the leveled plate into the cold bending forming unit, completing the first bending flange edge through multiple forming steps; continuing to bend multiple times to complete the forming of the second bending flange edge, and finally welding the second bending flange edge to form a closed cavity; S5. According to the required length, cut and cut the rolled profile to a fixed length to obtain an integrated inner and outer panel threshold beam.

[0033] It should be noted that, in step S2, the local softening treatment of the plate is carried out before the secondary leveling. When the locally heated steel strip passes through multiple mechanisms, the temperature of the locally heated part of the steel strip can be evenly transmitted, further ensuring that no cracks occur on both the inner and outer sides of the fillet when the steel strip is bent 180°; at the same time, the local softening mechanism is used to heat the steel strip instead of heating the formed profile, which not only makes it easier to control the heating range and heating accuracy, but also the arrangement of the local softening mechanism is not limited by space and is easy to operate, which facilitates the arrangement of heating components and cooling components.

[0034] The local softening treatment of the plate includes two steps of heating and cooling, which partially converts the plate into austenite to enhance the ductility and tensile strength of the plate, which not only greatly reduces the risk of cracking, but also improves the forming accuracy of the rolled profile and maximizes the overall truncation bending resistance.

[0035] Regarding the specific method of local softening treatment, the heating step preferably adopts laser heating, and the cooling step preferably adopts spray cooling; both laser heating and spray cooling have the characteristics of high precision and high efficiency, and can achieve rapid softening of the plate.

[0036] In step S3, due to the local softening treatment of the plate, some deformation of the plate is inevitable during the heating and cooling process. Therefore, in order to ensure the accuracy of the threshold beam, the plate after the local softening treatment needs to be leveled twice and then sent to the cold bending forming unit for forming.

[0037] In step S4, the cold bending forming of the plate includes four stages: In the first stage, the first bending flange is symmetrically bent to make the sheet material symmetrically bent 180°; In the second stage, the angles of the second bent flange edges on both sides of the sheet end are first formed to the position, and then the rounded corners of the upper wall of the outer beam / the upper wall of the inner beam are formed to form the upper wall of the outer beam / the upper wall of the inner beam; In the third stage, the outer beam side wall / inner beam side wall is formed by bending the fillets of the lower walls on both sides for multiple times, and finally the second bent outer edges / second bent inner edges on both sides of the sheet end are parallelly fitted, and then welded to form a closed roll-formed profile; In the fourth stage, more precise cross-section accuracy control is performed through the sizing unit.

[0038] See also Figure 4 ,by Figure 1 Taking the inner and outer panel threshold beam shown in the figure as an example, its forming process goes through four stages and 24 bending steps.

[0039] In the first stage, the first bending flange is symmetrically formed to make the sheet material symmetrically bend 180°, and a total of 8 forming steps are performed; In the second stage, the second bending flange is symmetrically formed, and the rounded corners of the upper arms on both sides are formed at the same time, and a total of 7 forming steps are performed; In the third stage, the lower wall radii on both sides are bent multiple times to make the flange edges of the second inner and outer plates fit together, and then welded together to form a closed roll-formed profile, which is formed through 6 steps in total; In the fourth stage, more precise cross-section accuracy control is carried out through the sizing unit, with a total of three control passes.

[0040] It should be noted that if the inner beam side wall 1-8 and the outer beam side wall 1-3 are of special shape, it is necessary to add a corresponding forming roller set in the second stage to complete the forming in this stage.

[0041] In the third stage of step S4, the welding between the second bend outer edge and the second bend inner edge is performed by arc welding or fusion welding. The arc welding can be tungsten inert gas shielded arc welding, metal inert gas shielded arc welding, carbon dioxide gas shielded arc welding or plasma arc welding, and the fusion welding can be electron beam welding or laser welding; preferably, laser welding is used, which has a fast welding speed and high weld strength.

[0042] Roller punching automated forming production line based on the above processing method, such as Figure 6 , Figure 7 As shown, it includes an uncoiler 10, a first leveling machine 20, a local softening mechanism 30, a second leveling machine 40, a punching mechanism 50, a servo feeding mechanism 60, a missing punching detection mechanism 70, a pit bridge 80, a cold bending forming unit 90, a welding mechanism 100, a cutting mechanism 110, and a material receiving mechanism 120 which are arranged in sequence.

[0043] The uncoiler 10 and the first leveler 20 are used for uncoiling and first leveling the plate.

[0044] In the actual processing process, due to the need to replace the material coil of the plate, the outlet end of the first leveling machine 20 is also provided with a shearing and welding mechanism (not marked in the figure) to achieve the cutting of the head and tail of the metal plate when the metal plate coil is replaced, and the welding of the front and rear steels together to achieve continuous feeding, reduce material waste and improve production efficiency.

[0045] The local softening mechanism 30 is used to locally heat and cool the plate corresponding to the first bending flange edge fillet position in advance, improve the ductility of this part of the plate, and ensure that no cracks occur on the plate surface when forming a 180° fillet. Specifically, the local softening mechanism 30 includes a heating probe 5 and a cooling nozzle 6, wherein the heating probe 5 is located at the front end and the cooling nozzle 6 is located at the rear end; the plate is converted into austenite by heating the heating probe 5, and then the plate temperature is ensured to be within the austenite range by appropriate cooling, and then the bending forming is performed.

[0046] The present invention particularly arranges the local softening mechanism 30 upstream of the cold roll forming unit 90, and also arranges a plurality of operating mechanisms between the local softening mechanism 30 and the cold roll forming unit 90: a second leveling machine 40, a punching mechanism 50, a servo feeding mechanism 60, a missing punching detection mechanism 70, and a pit bridge 80. When the locally heated steel strip passes through the plurality of mechanisms, the temperature of the locally heated portion of the steel strip is evenly conducted, further ensuring that no cracks occur on both the inner and outer sides of the fillet when the steel strip is bent 180°.

[0047] During the local softening of the plate, in order to ensure high-precision positioning of the heating position and the cooling position, avoid deviation of the steel strip, and ensure effective clamping of the steel strip 2, the upstream of the heating probe 5 is provided with a feed guide wheel 3 and a feed clamping wheel 4, and the downstream of the cooling nozzle 6 is provided with a discharge clamping wheel 7 and a discharge guide wheel 8. A certain amount of sealing gap is maintained between the guide wheel, the clamping wheel and the steel strip to ensure that the steel strip does not deviate laterally.

[0048] When the steel strip 2 enters the local softening mechanism 30, the steel strip 2 passes through the feed guide wheel 3, feed clamping wheel 4, discharge clamping wheel 7, and discharge guide wheel 8 in sequence; the feed guide wheel initially aligns the steel strip, and the feed clamping wheel keeps the steel strip straight and stable, which facilitates the precise positioning of the heating and cooling equipment; when the guide wheel and clamping wheel are adjusted to the appropriate position and the material strip passes normally, the heating probe and cooling nozzle are started; the heating probe 5 and the cooling nozzle 6 are aligned with the position to be treated of the steel strip to perform the softening operation. The steel strip 2 after local softening treatment is horizontally output under the guidance of the discharge clamping wheel 7 and the discharge guide wheel 8.

[0049] Preferably, the heating probe 5 is a laser heating probe, and the cooling nozzle 6 is a spray cooling nozzle, which has high precision and high efficiency.

[0050] Since some deformation will inevitably occur to the steel strip after local softening, in order to ensure high precision of cooling and forming and to ensure 180° bending of the local softening part, a second leveling machine 40 is further arranged downstream of the local softening mechanism 30 to perform secondary leveling on the steel strip plate before sending it to the cold bending forming unit 90 for roller forming.

[0051] According to the installation and connection requirements of the rolled profile and other components, a punching mechanism 50 is further provided after the second leveling machine 40 and before the cold roll forming unit 90, for pre-punching the product installation holes. The servo feeding unit is an electronic auxiliary device before pre-punching, which is used to assist the pre-punching fixed-length feeding; the punching unit is used to punch the holes on the product in advance; and the missing punching detection unit is used to check whether the punching unit has any missing punching.

[0052] Since the punching speed is not necessarily consistent with the feeding speed of the metal sheet, a pit bridge 80 is provided downstream of the punching mechanism 50 for storing the metal sheet material. This ensures that the front and rear processing are not affected when the front and rear production speeds are different. It is mainly used for correcting the punching mechanism 50 and the front and rear material strips.

[0053] The bending forming unit 90 is provided with a plurality of pressing rollers to meet the forming requirements of the threshold beam. The shape and arrangement of the pressing rollers are determined according to the specific structural arrangement of the threshold beam. When the structure and shape of the inner beam or the outer beam are changed, the adjustment can be achieved by increasing or decreasing the number of pressing rollers in the corresponding cold bending forming unit and changing the shape, and the processing of products with different structures can be achieved with minor equipment changes.

[0054] The welding machine in the welding mechanism 100 can be an arc welding machine or a fusion welding machine, which has a fast welding speed and high precision. A cutting mechanism 110 is arranged downstream of the welding mechanism 100 for cutting the sill beam profile according to the use length.

[0055] In addition, the production line also includes some processing auxiliary mechanisms, such as a material receiving machine 120, an electric control mechanism, a safety protection mechanism, etc. Among them, the material receiving mechanism 120 is arranged downstream of the cutting mechanism 110 to assist manual unloading; the electric control mechanism is used for the whole line control of the roller pressing line; the safety protection mechanism is used for the whole line human-machine isolation, mainly including isolation nets, safety doors, safety gratings, etc. Since these auxiliary mechanisms are not the invention of the present invention, they are all prior art and will not be described here.

[0056] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. An integrated inner and outer panel threshold beam, characterized in that: The threshold beam is a closed cavity formed by a plate through multiple bending steps; the threshold beam is composed of an inner beam and an outer beam that are relatively buckled, and a first bending flange edge and a second bending flange edge are respectively arranged at the connection between the inner beam and the outer beam, and the first bending flange edge and the second bending flange edge are both double-layer stacked edges; the first bending flange edge is formed by symmetrically bending the plate itself by 180°, and the length of the first bending flange edge is not less than 4 times the thickness of the plate material, and the second bending flange edge is formed by welding after the two ends of the plate are parallelly fitted.

2. The integrated inner and outer panel sill beam according to claim 1, characterized in that: The outer beam comprises a second bent outer edge (1-1), an outer beam upper wall (1-2), an outer beam side wall (1-3), an outer beam lower wall (1-4) and a first bent outer edge (1-5); the inner beam comprises a second bent inner edge (1-10), an inner beam upper wall (1-9), an inner beam side wall (1-8), an inner beam lower wall (1-7) and a first bent inner edge (1-6); the first bent inner edge (1-6) and the first bent outer edge (1-5) are stacked and formed to form a first bent flange edge, and the second bent inner edge (1-10) and the second bent outer edge (1-1) are welded after being bonded to form a second bent flange edge.

3. The integrated inner and outer panel sill beam according to claim 3, characterized in that: The angle between the outer beam upper wall (1-2) and the inner beam upper wall (1-9), and the angle between the outer beam lower wall (1-4) and the inner beam lower wall (1-7) are not less than 120°; the inner beam side wall (1-8) and the outer beam side wall (1-3) are planar or special-shaped to meet the boundary conditions of the automobile manufacturer.

4. The method for processing an integrated inner and outer panel door sill beam according to any one of claims 1 to 3, characterized in that: The processing method specifically comprises the following steps: S1. Uncoiling, leveling and pre-punching the sheet; S2, locally softening the pre-leveled plate, where the softened position corresponds to the rounded corner position of the first bending flange edge; S3, sending the softened steel strip to the second leveling machine for leveling again; S4, sending the leveled plate into the cold bending forming unit, completing the first bending flange edge through multiple forming steps; continuing to bend multiple times to complete the forming of the second bending flange edge, and finally welding the second bending flange edge to form a closed cavity; S5. According to the required length, cut and cut the rolled profile to a fixed length to obtain an integrated inner and outer panel threshold beam.

5. The method for processing an integrated inner and outer panel sill beam according to claim 4, characterized in that: In the step S2, local softening treatment of the plate is performed before secondary leveling.

6. The method for processing an integrated inner and outer panel sill beam according to claim 5, characterized in that: The local softening treatment of the plate includes two steps of heating and cooling, so as to enhance the ductility and tensile strength of the plate.

7. The method for processing an integrated inner and outer panel door sill beam according to claim 6, characterized in that: The local softening treatment is performed by laser heating, and the cooling treatment is performed by spray cooling.

8. The method for processing an integrated inner and outer panel sill beam according to claim 4, characterized in that: In step S4, the cold bending forming of the plate includes four stages: In the first stage, the first bending flange is symmetrically bent to make the sheet material symmetrically bent 180°; In the second stage, the angles of the second bent flanges on both sides of the sheet end are first formed to the position, and then the rounded corners of the upper wall of the outer beam / the upper wall of the inner beam are formed to form the upper wall of the outer beam / the upper wall of the inner beam; In the third stage, the outer beam side wall / inner beam side wall is formed by bending the fillets of the lower walls on both sides for multiple times, and finally the second bent outer edges / second bent inner edges on both sides of the sheet end are parallelly fitted, and then welded to form a closed roll-formed profile; In the fourth stage, more precise cross-section accuracy control is performed through the sizing unit.

9. The method for processing an integrated inner and outer panel sill beam according to claim 8, characterized in that: In the third stage of step S4, arc welding or fusion welding is used for welding between the second bend outer edge and the second bend inner edge.

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