Treatment process and production line of variable-strength automobile anti-collision beam rolling profile

Abstract

The invention discloses a treatment process and a production line of a variable-strength automobile anti-collision beam rolling profile, and relates to the technical field of automobile anti-collision beam manufacturing, and the treatment process comprises the following steps: material selection and primary leveling; local heating and cooling; secondary leveling and punching are carried out; and carrying out primary cold roll forming and secondary cold roll forming. According to the treatment process, the strength of the target position of the ultra-high-strength steel forming plate is changed, so that the problem of cracking cannot occur when the small fillet of the ultra-high-strength steel forming plate is bent, a rolling production line can normally operate for a long time, and the production efficiency is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of automotive crash beam manufacturing technology, and in particular to a processing technology and production line for a variable strength automotive crash beam roll-formed profile. Background Technology

[0002] With the growing demand for lightweighting in the automotive industry, the use of ultra-high-strength steel in automotive crash beams is becoming increasingly common. However, this presents significant challenges to the cold-forming industry. On one hand, the small radius bends of ultra-high-strength steel sheets are prone to cracking, causing production line shutdowns and resulting in substantial economic losses for companies. On the other hand, the large springback angle of ultra-high-strength steel sheets makes it difficult to control forming precision. Complex cross-sections such as B-shaped, U-shaped, and crisscross-shaped multi-cavity profiles have numerous forming blind corners, leading to low forming precision in the roll-formed profiles. Currently, traditional roll-formed profiles often improve precision by increasing the number of pressure rollers and using numerous complex forming fixtures. However, this approach of simply increasing the number of pressure rollers significantly increases manufacturing costs. Therefore, how to improve the processing difficulty of the formed sheets while ensuring national safety collision regulations and lightweighting requirements has become an urgent problem to solve. Summary of the Invention

[0003] The purpose of this invention is to provide a processing technology and production line for roll-formed profiles of variable strength automotive anti-collision beams in order to solve the above-mentioned problems.

[0004] The present invention achieves the above objectives through the following technical solutions:

[0005] A processing method for roll-formed profiles of variable strength automotive anti-collision beams includes the following steps:

[0006] (1) Material selection and first leveling: select ultra-high strength steel plate as the forming plate, then the staff put the forming plate into the uncoiler, the uncoiler uncoils the forming plate and conveys it to the first leveling machine, the first leveling machine performs a first leveling process.

[0007] (2) Local heating and cooling: The molded sheet after one leveling is conveyed to the local heating and cooling mechanism. First, the heating component on the local heating and cooling mechanism heats and softens the target position of the molded sheet. Then, the cooling component on the local heating and cooling mechanism cools the target position of the molded sheet after the heat softening treatment. After the cooling treatment, the target position of the molded sheet forms a strength treatment part. The strength of the strength treatment part is less than the strength of other positions of the molded sheet.

[0008] (3) Secondary leveling and punching: The formed plate after local heating and cooling is conveyed to the second leveling machine, which performs secondary leveling. Then, it is conveyed to the punching machine, which performs punching to process mounting holes on the formed plate.

[0009] (4) First-time cold bending and second-time cold bending: The punched sheet material is transported to the first cold bending forming unit for first-time cold bending. Then, the sheet material after first-time cold bending is transported to the second cold bending forming unit for second-time cold bending to obtain variable strength automotive anti-collision beam roll profile. Then, the roll profile is cut and blanked according to requirements.

[0010] Preferably, in step (2), the heating component is a laser machine and the cooling component is a spray nozzle.

[0011] Preferably, the laser heating temperature in step (2) is 200–390°C.

[0012] Preferably, in step (2), when the thickness of the formed plate is 0.8 to 0.9 mm, the laser scanning speed is 30 to 40 mm / s; when the thickness of the formed plate is 1 to 1.6 mm, the laser scanning speed is 10 to 25 mm / s.

[0013] Preferably, the tensile strength of the roll-formed profile is 1500-1600 MPa, and the tensile strength of the strength-treated section is 950-1200 MPa.

[0014] Preferably, the roll-formed profile is a first roll-formed part with an open shape, or a second roll-formed part with a closed shape, or a third roll-formed part with a small rounded corner, or a fourth roll-formed part with a large-angle springback, or a fifth roll-formed part with multiple forming blind corners, or a sixth roll-formed part with a small number of forming blind corners, or a seventh roll-formed part with reduced strength in the straight section.

[0015] Preferably, the strength-treated section on the first roller is located at the rounded corner position where bending is required; the strength-treated section on the second roller is located at the rounded corner position where bending is required; the strength-treated section on the third roller is located at the small rounded corner position where bending is required; the strength-treated section on the fourth roller is located at the rounded corner position where large-angle springback is required; the strength-treated section on the fifth roller is located at the rounded corner position where forming blind corner is required; the strength-treated section on the sixth roller is located at the rounded corner position where forming blind corner is required; and the strength-treated section on the seventh roller is located at the straight section position where strength needs to be reduced.

[0016] A production line for roll-formed profiles of variable strength automotive crash beams is provided. The production line is used for the aforementioned processing of roll-formed profiles of variable strength automotive crash beams. The production line includes, in sequence, an uncoiler, a first leveling machine, a local heating and cooling mechanism, a second leveling machine, a punching machine, a first cold bending forming unit, a second cold bending forming unit, a cutting machine, and a receiving mechanism. The uncoiler is used to uncoil the formed sheet material. The first leveling machine is used to pre-level the formed sheet material. The local heating and cooling mechanism is used to process a strength-treated section at a target location on the formed sheet material. The second leveling machine is used to level the formed sheet material again to ensure the processing accuracy of subsequent punching processes. The punching machine is used to process mounting holes on the formed sheet material. The first cold bending forming unit is used to perform a single roll forming of the formed sheet material. The second cold bending forming unit is used to perform a second roll forming of the formed sheet material. The cutting machine is used to cut the roll-formed profile according to requirements. The receiving mechanism assists the operator in unloading the material.

[0017] Preferably, the local heating and cooling mechanism includes a worktable. Two feed guide rollers are fixedly mounted on one end of the worktable near the first leveling machine, located on opposite sides of the worktable. Two discharge guide rollers are fixedly mounted on the other end of the worktable, also located on opposite sides. A feed clamping roller is fixedly mounted on the worktable near the feed guide rollers, and a discharge clamping roller is fixedly mounted on the worktable near the discharge guide rollers. A heating assembly is positioned directly above the worktable near the feed clamping rollers, and a cooling assembly is positioned directly above the worktable near the discharge clamping rollers. The formed sheet material passes sequentially through the two feed guide rollers and the two discharge guide rollers.

[0018] Preferably, a first welding machine is provided between the first cold bending forming unit and the second cold bending forming unit, and a second welding machine and a roll forming machine are provided between the second cold bending forming unit and the cutting machine; the first welding machine is used to weld the forming sheet material to be welded, the second welding machine is used to weld the roll-formed profile to be welded, and the roll forming machine is used to shape the roll-formed profile.

[0019] The beneficial effects of the present invention are as follows: (1) The processing technology of the present invention changes the strength of the target position of the ultra-high strength steel forming plate, so that the ultra-high strength steel forming plate will not crack when the small rounded corner is bent, so that the roll forming production line can operate normally for a long time and ensure production efficiency; (2) The processing technology changes the strength of the large-angle springback rounded corner of the ultra-high strength steel forming plate, and the dimensional accuracy is controllable, thereby improving the forming accuracy; (3) Compared with the traditional roll forming method, the processing technology does not require increasing the number of pressure rollers and a large number of complex forming auxiliary tools to improve the accuracy of the roll forming profile, thereby reducing the manufacturing cost; (4) The processing technology only heats and cools the local position of the forming plate (i.e. the target position, such as the small rounded corner and the springback angle), thereby achieving a differentiated strength distribution in different areas of the cross section of the forming plate, which not only ensures the overall performance but also reduces the forming difficulty. Compared with the traditional method of heat treating the entire forming plate, it can reduce energy consumption. Attached Figure Description

[0020] Figure 1 This is a schematic cross-sectional view of the first roller pressing component of the present invention;

[0021] Figure 2 This is a schematic diagram of the cross-section of the second roller pressing component of the present invention;

[0022] Figure 3 This is a schematic diagram of the cross-section of the third roller pressing component of the present invention;

[0023] Figure 4 This is a schematic cross-sectional view of the fourth roller pressing component of the present invention;

[0024] Figure 5 This is a schematic cross-sectional view of the fifth roller pressing component of the present invention;

[0025] Figure 6 This is a schematic cross-sectional view of the sixth roller pressing component of the present invention;

[0026] Figure 7 This is a schematic cross-sectional view of the seventh roller pressing component of the present invention;

[0027] Figure 8 This is a front view of the production line of the present invention;

[0028] Figure 9 This is a top view of the local heating and cooling mechanism of the present invention;

[0029] Figure 10 This is a graph showing the test data of the three-point bending performance of the first roller press of the present invention;

[0030] Figure 11 This is a graph showing the test data of the three-point bending performance of the second roller press of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 11. First roll forming component; 12. Second roll forming component; 13. Third roll forming component; 14. Fourth roll forming component; 15. Fifth roll forming component; 16. Sixth roll forming component; 17. Seventh roll forming component; 2. Strength treatment section; 301. Uncoiler; 302. First leveling machine; 303. Local heating and cooling mechanism; 3031. Feed guide roller; 3032. Feed clamping roller; 3033. Heating assembly; 3034. Cooling assembly; 3035. Discharge clamping roller; 3036. Discharge guide roller; 304. Second leveling machine; 305. Punching machine; 306. First cold bending forming unit; 307. First welding machine; 308. Second cold bending forming unit; 309. Second welding machine; 310. Roll forming unit; 311. Cutting machine; 312. Receiving mechanism. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings:

[0034] like Figure 3 and Figure 8As shown, the present invention provides a processing technology for roll-formed profiles of variable strength automotive anti-collision beams, including the following steps: (1) Material selection and primary leveling: Ultra-high strength steel plate is selected as the forming plate. Then, the worker places the forming plate in the uncoiler 301. The uncoiler 301 uncoils the forming plate and conveys it to the first leveling machine 302. The first leveling machine 302 performs primary leveling treatment on it. (2) Local heating and cooling: The forming plate after primary leveling is conveyed to the local heating and cooling mechanism 303. First, the heating component 3033 on the local heating and cooling mechanism 303 heats and softens the target position of the forming plate. Then, the cooling component 3034 on the local heating and cooling mechanism 303 cools the target position of the formed plate after the heat softening treatment. After cooling treatment, the target position of the forming plate forms a strength treatment part 2. The strength of the strength treatment part 2 is less than the strength of other positions of the forming plate. Among them, the heating component 3033 is a laser machine. By controlling the laser machine, it can perform local heating and softening treatment on the formed plate with high precision and high efficiency. The laser heating temperature is 200-390℃. In production, when the thickness of the formed plate is 0.8-0.9mm, the laser scanning speed is 30-40mm / s; when the thickness of the formed plate is 1-1.6mm, the laser scanning speed is 10-25mm / s. The cooling component 3034 is a spray nozzle. The spray nozzle can perform high precision and high efficiency cooling treatment on the target position, which can effectively reduce the intensity of the target position and reduce the quenching stress. (3) Secondary leveling and punching: The formed plate after local heating and cooling treatment is conveyed to the second leveling machine 304. The second leveling machine 304 performs secondary leveling treatment on it. Then, it is conveyed to the punching machine 305. The punching machine 305 performs punching treatment on it to process mounting holes on the formed plate. (4) Primary and secondary cold bending forming: The punched sheet material is conveyed to the first cold bending forming unit 306 for primary cold bending forming. Then, the sheet material after primary cold bending forming is conveyed to the second cold bending forming unit 308 for secondary cold bending forming, resulting in a variable strength automotive anti-collision beam roll-formed profile. The roll-formed profile is then sheared and cut according to requirements. The tensile strength of the roll-formed profile is 1500–1600 MPa, and the tensile strength of the strength treatment section 2 is 950–1200 MPa. For example... Figures 1 to 7As shown, the roll-formed profile can be a first roll forming member 11 with an open shape, or a second roll forming member 12 with a closed shape, or a third roll forming member 13 with small rounded corners, or a fourth roll forming member 14 with large-angle springback, or a fifth roll forming member 15 with multiple forming blind corners, or a sixth roll forming member 16 with a small number of forming blind corners, or a seventh roll forming member 17 with reduced strength in the straight section. The strength treatment section 2 on the first roll forming member 11 is located at the rounded corner position where bending is required, the strength treatment section 2 on the second roll forming member 12 is located at the rounded corner position where bending is required, the strength treatment section 2 on the third roll forming member 13 is located at the small rounded corner position where bending is required, the strength treatment section 2 on the fourth roll forming member 14 is located at the rounded corner position with large-angle springback, the strength treatment section 2 on the fifth roll forming member 15 is located at the rounded corner position of the forming blind corner, the strength treatment section 2 on the sixth roll forming member 16 is located at the rounded corner position of the forming blind corner, and the strength treatment section 2 on the seventh roll forming member 17 is located at the straight section position where strength needs to be reduced.

[0035] Specifically, such as Figure 1 The image shows the cross-sectional shape of the first roll-formed component 11 (i.e., the open-shaped anti-collision beam). The first roll-formed component 11 contains eight rounded bends, and the strength treatment section 2 is located at the rounded bends. The strength at the eight rounded bends is less than the strength in other areas (i.e., the undeformed straight sections). A three-point bending performance test was then performed on the first roll-formed component 11. The test results are shown in Table 1 and below. Figure 10 As shown.

[0036] Table 1

[0037] Serial Number Fillet strength (MPa) Strength of a straight segment (MPa) Bending moment (Nm) A 1500 1500 2668 B 1180 1500 2645.7 C 980 1500 2571.4

[0038] As can be seen, the overall strength of the product parts in Group A (control group) after bending is 1500 MPa; the strength of all rounded corners in Group B after bending is 1180 MPa, and the strength of the undeformed straight section is 1500 MPa; the strength of all rounded corners in Group C after bending is 980 MPa, and the strength of the undeformed straight section is 1500 MPa. Therefore, under the requirements of collision regulations, Groups B and C can still achieve a collision protection effect close to that of Group A.

[0039] like Figure 2 The image shows the cross-sectional shape of the second roll-formed component 12 (i.e., the closed-shaped anti-collision beam). The second roll-formed component 12 contains eight rounded bends, and the strength treatment section 2 is located at the rounded bends. The strength at the eight rounded bends is less than the strength in other areas (i.e., the undeformed straight sections). A three-point bending performance test was then conducted on the second roll-formed component 12. The test results are shown in Table 2 and below. Figure 11 As shown.

[0040] Table 2

[0041] Serial Number Fillet strength (MPa) Strength of a straight segment (MPa) Bending moment (kN.m) A 1500 1500 11.21 B 1180 1500 10.19 C 980 1500 9.58

[0042] As can be seen, the overall strength of the product parts in Group A (control group) after bending is 1500 MPa; the strength of all rounded corners in Group B after bending is 1180 MPa, and the strength of the undeformed straight section is 1500 MPa; the strength of all rounded corners in Group C after bending is 980 MPa, and the strength of the undeformed straight section is 1500 MPa. Therefore, under the requirements of collision regulations, Groups B and C can still achieve a collision protection effect close to that of Group A.

[0043] like Figure 3 The diagram shows the cross-sectional shape of the third roll-formed component 13 (i.e., the anti-collision beam with small rounded corners). The third roll-formed component 13 contains eight rounded bends, of which the bottom four rounded bends are small rounded corners. The strength treatment section 2 is located at the four small rounded corners, and the strength at the four small rounded corners is less than the strength in other areas (i.e., the undeformed straight section and the four rounded bends). This not only greatly reduces the risk of cracking during cold bending forming but also improves the forming accuracy of the roll-formed profile and maximizes the overall cross-sectional bending resistance.

[0044] like Figure 4 The diagram shows the cross-sectional shape of the fourth roll forming member 14 (i.e., the one with the large-angle springback anti-collision beam). The fourth roll forming member 14 contains four rounded bends, of which the bottom two rounded bends are large-angle springback rounded bends. The strength treatment section 2 is located at the two large-angle springback rounded bends. The strength at the two large-angle springback rounded bends is less than the strength in other areas (i.e., the undeformed straight section and the two rounded bends). This improves the forming accuracy of the roll forming profile during cold bending and maximizes the overall cross-sectional bending resistance.

[0045] like Figure 5 The diagram shows the cross-sectional shape of the fifth roll-formed part 15 (i.e., the anti-collision beam with multiple forming blind corners). The fifth roll-formed part 15 contains 7 rounded corners, of which 4 rounded corners at the edges are forming blind corners. The strength treatment section 2 is located at the 4 forming blind corners. The strength at the 4 forming blind corners is less than the strength of other areas (i.e., the undeformed straight section and the 3 rounded corners). This not only greatly reduces the forming difficulty during cold bending forming, but also improves the forming accuracy of the roll-formed profile and maximizes the overall cross-sectional bending resistance.

[0046] like Figure 6 The diagram shows the cross-sectional shape of the sixth roll forming member 16 (i.e., the anti-collision beam with a small number of forming blind corners). The sixth roll forming member 16 contains eight rounded corners, two of which are forming blind corners. The strength treatment section 2 is located at the two forming blind corners. The strength at the two forming blind corners is less than the strength of other areas (i.e., the undeformed straight section and the six rounded corners). This not only greatly reduces the forming difficulty during cold bending forming but also improves the forming accuracy of the roll forming profile and maximizes the overall cross-sectional bending resistance.

[0047] like Figure 7 The diagram shows the cross-sectional shape of the seventh roll-formed component 17 (i.e., the straight section strength-reducing anti-collision beam). The seventh roll-formed component 17 contains seven rounded bends. The upper and lower four straight sections are strength-reducing areas. The strength-reducing section 2 is located in the four straight sections requiring strength reduction. The strength of these four straight sections is lower than that of other areas (i.e., the remaining straight sections and the seven rounded bends). Thus, the roll-formed profile obtained after cold bending meets the requirements of high strength, high energy absorption, and lightweight.

[0048] like Figure 4 and Figure 8 As shown, the present invention also provides a production line for roll-formed profiles of variable strength automotive crash beams. The production line is used for the processing technology of the aforementioned roll-formed profiles of variable strength automotive crash beams. The production line includes an uncoiler 301, a first leveler 302, a local heating and cooling mechanism 303, a second leveler 304, a punching machine 305, a first cold bending forming unit 306, a second cold bending forming unit 308, a cutting machine 311, and a receiving mechanism, arranged sequentially and adjacently. The uncoiling machine 301 is used to uncoil the formed sheet material; the first leveling machine 302 is used to pre-level the formed sheet material; the local heating and cooling mechanism 303 is used to process the strength treatment section 2 at the target position of the formed sheet material; the second leveling machine 304 is used to level the formed sheet material again to ensure the processing accuracy of the subsequent punching process; the punching machine 305 is used to process mounting holes on the formed sheet material; the first cold bending forming unit 306 is used to perform a single roll forming of the formed sheet material; the second cold bending forming unit 308 is used to perform a second roll forming of the formed sheet material; the cutting machine 311 is used to cut the roll-formed profile according to requirements; and the receiving mechanism is used to assist the operator in unloading the material. In this embodiment, both the first cold bending forming unit 306 and the second cold bending forming unit 308 are equipped with multiple passes of pressure rollers, and the shape of the pressure rollers can be set according to the specific structure of the roll-formed profile. When the structure of the roll-formed profile changes, it can be adjusted by changing the number and shape of the pressure rollers in the corresponding cold bending forming unit, thus enabling the processing of roll-formed profiles with different structures with relatively small equipment modifications.

[0049] like Figure 8 and Figure 9As shown, based on the above embodiment, the local heating and cooling mechanism 303 further includes a worktable. Two feed guide wheels 3031 are fixedly arranged on one end of the worktable near the first leveling machine 302, located on opposite sides of the worktable. Two discharge guide wheels 3036 are fixedly arranged on the other end of the worktable, located on opposite sides of the worktable. The feed guide wheels 3031 and 3036 ensure the forming plate is aligned, preventing it from deviating and ensuring the accuracy of local heating and cooling. A feed clamping wheel 3032 is fixedly arranged on the worktable near the feed guide wheel 3031, and a discharge clamping wheel 3035 is fixedly arranged on the worktable near the discharge guide wheel 3036. The feed clamping wheel 3032 and 3035 can clamp the forming plate, making it straight and stable, improving the processing accuracy of local heating and cooling. A heating assembly 3033 is positioned directly above the worktable, near the infeed clamping roller 3032, and a cooling assembly 3034 is positioned directly above the worktable, near the discharge clamping roller 3035. The formed sheet material passes sequentially through two infeed guide rollers 3031 and two discharge guide rollers 3036. In this embodiment, the formed sheet material is used to process the fourth roll-formed part 14. The heating assembly 3033 heats only a localized area (i.e., the target location), which reduces energy consumption compared to the traditional method of heat-treating the entire formed sheet material.

[0050] like Figure 8 As shown, based on the above embodiment, a first welding machine 307 is provided between the first cold bending forming unit 306 and the second cold bending forming unit 308, and a second welding machine 309 and a roll forming machine 310 are provided between the second cold bending forming unit 308 and the cutting machine 311. The first welding machine 307 is used to weld the formed sheet material to be welded, the second welding machine 309 is used to weld the roll-formed profile to be welded, and the roll forming machine 310 is used to shape the roll-formed profile. The first welding machine 307 and the second welding machine 309 can be either an arc welding machine or a fusion welding machine.

[0051] The processing technology of this invention fills the technological gap in the variable strength processing of complex ultra-high strength steel profiles. Furthermore, the production line of this invention forms multi-rounded open or closed parts through continuous bending, creating different cross-sectional structures and achieving a series of product types with different boundary conditions, thus adapting to vehicle models. It boasts advantages such as reduced pressure roller sets, high forming accuracy, and low processing costs.

[0052] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Those skilled in the art should understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and all such changes should be covered within the protection scope of the present invention. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A processing technology for roll-formed profiles of variable strength automotive anti-collision beams, characterized in that: Includes the following steps: (1) Material selection and first leveling: select ultra-high strength steel plate as the forming plate, then the staff put the forming plate into the uncoiler, the uncoiler uncoils the forming plate and conveys it to the first leveling machine, the first leveling machine performs a first leveling process. (2) Local heating and cooling: The molded sheet after one leveling is conveyed to the local heating and cooling mechanism. First, the heating component on the local heating and cooling mechanism heats and softens the target position of the molded sheet. Then, the cooling component on the local heating and cooling mechanism cools the target position of the molded sheet after the heat softening treatment. After the cooling treatment, the target position of the molded sheet forms a strength treatment part. The strength of the strength treatment part is less than the strength of other positions of the molded sheet. (3) Secondary leveling and punching: The formed plate after local heating and cooling is conveyed to the second leveling machine, which performs secondary leveling. Then, it is conveyed to the punching machine, which performs punching to process mounting holes on the formed plate. (4) First-time cold bending and second-time cold bending: The punched sheet material is transported to the first cold bending forming unit for first-time cold bending. Then, the sheet material after first-time cold bending is transported to the second cold bending forming unit for second-time cold bending to obtain variable strength automotive anti-collision beam roll profile. Then, the roll profile is cut and blanked according to requirements.

2. The processing technology for a variable strength automotive anti-collision beam roll-formed profile according to claim 1, characterized in that: In step (2), the heating component is a laser machine and the cooling component is a spray nozzle.

3. The processing technology for a variable strength automotive anti-collision beam roll-formed profile according to claim 2, characterized in that: In step (2), the laser heating temperature is 200-390℃.

4. The processing technology for a variable strength automotive anti-collision beam roll-formed profile according to claim 2, characterized in that: In step (2), when the thickness of the formed plate is 0.8 to 0.9 mm, the laser scanning speed is 30 to 40 mm / s; when the thickness of the formed plate is 1 to 1.6 mm, the laser scanning speed is 10 to 25 mm / s.

5. The processing technology for a variable strength automotive anti-collision beam roll-formed profile according to claim 1, characterized in that: The tensile strength of the roll-formed profile is 1500-1600 MPa, and the tensile strength of the strength-treated section is 950-1200 MPa.

6. The processing technology for a variable strength automotive anti-collision beam roll-formed profile according to claim 1, characterized in that: The roll-formed profile can be a first roll forming part with an open shape, or a second roll forming part with a closed shape, or a third roll forming part with a small rounded corner, or a fourth roll forming part with a large angle of springback, or a fifth roll forming part with multiple forming blind corners, or a sixth roll forming part with a small number of forming blind corners, or a seventh roll forming part with reduced strength in the straight section.

7. The processing technology for a variable strength automotive anti-collision beam roll-formed profile according to claim 6, characterized in that: The strength-treated section on the first roller is located at the rounded corner position where bending is required; the strength-treated section on the second roller is located at the rounded corner position where bending is required; the strength-treated section on the third roller is located at the small rounded corner position where bending is required; the strength-treated section on the fourth roller is located at the rounded corner position where large-angle springback is required; the strength-treated section on the fifth roller is located at the rounded corner position of the forming blind corner; the strength-treated section on the sixth roller is located at the rounded corner position of the forming blind corner; and the strength-treated section on the seventh roller is located at the straight section position where strength needs to be reduced.

8. A production line for roll-formed profiles of variable strength automotive anti-collision beams, characterized in that: The production line is used for the processing of the variable strength automotive anti-collision beam roll-formed profile as described in claim 1. The production line includes an uncoiler, a first leveler, a local heating and cooling mechanism, a second leveler, a punching machine, a first cold bending forming unit, a second cold bending forming unit, a cutting machine, and a receiving mechanism arranged sequentially. The uncoiler is used to uncoil the formed sheet. The first leveler is used to pre-level the formed sheet. The local heating and cooling mechanism is used to process a strength-treated section at the target position of the formed sheet. The second leveler is used to level the formed sheet again to ensure the processing accuracy of the subsequent punching process. The punching machine is used to process mounting holes on the formed sheet. The first cold bending forming unit is used to perform a first roll forming of the formed sheet. The second cold bending forming unit is used to perform a second roll forming of the formed sheet. The cutting machine is used to cut the roll-formed profile according to requirements. The receiving mechanism is used to assist the operator in unloading the material.

9. The production line for a variable strength automotive anti-collision beam roll-formed profile according to claim 8, characterized in that: The local heating and cooling mechanism includes a worktable. Two feed guide rollers are fixedly mounted on one end of the worktable near the first leveling machine, located on opposite sides of the worktable. Two discharge guide rollers are fixedly mounted on the other end of the worktable, also located on opposite sides. A feed clamping roller and a discharge clamping roller are fixedly mounted on the worktable near the feed guide rollers. A heating assembly and a cooling assembly are both located above the worktable near the discharge clamping rollers. The formed sheet material passes sequentially through the two feed guide rollers and the two discharge guide rollers.

10. The production line for a variable strength automotive anti-collision beam roll-formed profile according to claim 8, characterized in that: A first welding machine is provided between the first cold bending forming unit and the second cold bending forming unit, and a second welding machine and a roll forming machine are provided between the second cold bending forming unit and the cutting machine; the first welding machine is used to weld the forming sheet material to be welded, the second welding machine is used to weld the roll forming profile to be welded, and the roll forming machine is used to shape the roll forming profile.

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