Laser-assisted forming process for antioxidant high-strength steel part

Abstract

The invention discloses a laser-assisted forming process for an antioxidant high-strength steel part, which is characterized in that high-strength steel is processed into a part, and in the processing process, when the part is subjected to bending forming, laser is adopted to synchronously heat a local bending area of the part; the high-strength steel comprises the following chemical components in percentage by mass: 0.3 to 2.0 percent of Si and 1.5 to 3 percent of Cr, and the total content of Si and Cr is 2.0 to 4.5 percent. According to the method, the high-strength steel with specific components is combined with a specific laser-assisted forming process, the problems of high-temperature oxidation and local soft areas of the ultrahigh-strength steel in the laser-assisted rolling forming process can be remarkably solved, and the method has wide application prospects and is particularly suitable for forming complex parts in the field of new energy automobiles. The range of high-strength steel parts prepared from the high-strength steel is remarkably reduced, the microstructure stability is remarkably improved, and the oxidation resistance is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of part processing, in particular to a laser-assisted forming process for an oxidation-resistant high-strength steel part. BACKGROUND

[0002] To make up for the shortcomings of traditional cold stamping process and roll forming process, laser-assisted forming process is gradually applied. In the implementation of laser-assisted manufacturing process, the formability of steel is improved by local laser heating, which can realize near-zero springback forming of steel with strength of 1.5 GPa and above, break through the bottleneck of small-radius forming, and is particularly suitable for the manufacturing of battery pack frames. However, the present inventors have found that this technology still has the following technical problems: (1) Surface oxidation defects: During laser heating, the surface temperature of the steel is too high, which is easy to cause oxidation reaction and form an oxide skin. This not only affects the subsequent coating quality of the part, leading to a decrease in the adhesion of the coating, but also affects the appearance and corrosion resistance. If the oxide skin is removed by post-processing methods such as shot peening, mechanical damage may be caused to the surface of the part, thereby affecting the dimensional accuracy and assembly accuracy.

[0003] (2) Local softening risk: Although laser heating can improve the local formability of steel, excessive heating may cause softening in the heated area of ultra-high strength steel. This softening will weaken the local strength of the part and affect the overall performance, and is prone to local failure when subjected to large or cyclic loads, thereby reducing the durability and service life of the part. SUMMARY

[0004] The present application relates to the technical field of part processing, in particular to a laser-assisted forming process for an oxidation-resistant high-strength steel part.

[0005] To solve the above technical problems, the technical solution adopted by the present application is A laser-assisted forming process for an oxidation-resistant high-strength steel part, which uses high-strength steel to process a part. During processing, the part is bent and formed after a laser is used to heat the local bending area of the part to form a laser-softened zone; laser heating and bending forming are performed simultaneously. Among them, the chemical composition of the high-strength steel includes Si and Cr, and the content of Si is 0.3-2.0%, the content of Cr is 1.5-3%, and the total content of Si and Cr is 2.0-4.5% by mass fraction. The tensile strength of the high-strength steel is not less than 1600 MPa, the elongation is not less than 5%, the thickness of the oxidation layer in the local bending area after laser-assisted forming is less than 3 μm, and the hardness loss of the local bending area is not more than 20%.

[0006] As an aspect of the present application, the chemical composition of the high-strength steel includes, by mass fraction: C:0.20-0.45%, Si:0.3-2.0%, Mn:0.7-3.0%, Cr:1.5-2.5%, Nb:0.01-0.06%, balance Fe and inevitable impurities.

[0007] As an aspect of the present application, the chemical composition of the high-strength steel includes, by mass fraction: C:0.26, Si:1.1%, Mn:1.4%, Cr:2.7%, Nb:0.03%, balance Fe and inevitable impurities.

[0008] As an aspect of the present application, the process includes the following steps: S1, using high-strength steel to process a steel plate, and then performing heat treatment; S2, using the heat-treated steel plate to process a part, and in the processing, using a roll forming process to bend and form the part, and simultaneously using laser to heat the bending and forming area of the part.

[0009] As an aspect of the present application, in step S2, the bending angle of the steel plate is 2-20° per pass of roll forming.

[0010] As an aspect of the present application, in step S2, the thickness of the steel plate in the bending and forming area is 0.5-2.0 mm.

[0011] As an aspect of the present application, in step S2, the laser power is 500-2000 W.

[0012] As an aspect of the present application, in step S2, in the roll forming process, the motion trajectory of the roll forming is controlled according to the shape of the target part, and the laser is controlled to scan the bending and forming area synchronously, the roll forming speed and the laser scanning speed are the same, both are 10-200 mm / s.

[0013] As an aspect of the present application, the maximum forming force of the roll forming is 800-3000 N.

[0014] As an aspect of the present application, in step S2, the thickness of the steel plate in the bending and forming area is 0.8-1.4 mm; the laser power is 800-1500 W, the laser scanning speed is 50-100 mm / s; and the maximum forming force of the roll forming is 1000-2000 N.

[0015] The present application has the following advantages: The application provides a laser-assisted forming process for an anti-oxidation high-strength steel part, which can significantly improve high-temperature oxidation and local soft area problems of ultra-high-strength steel in a laser-assisted roll forming process by combining high-strength steel with specific components and the specific laser-assisted forming process, and has wide application prospects, and is particularly suitable for forming of complex parts in the field of new energy vehicles.

[0016] Compared with conventional martensitic steel, the hardness loss of the high-strength steel part after bending is smaller by applying the roll forming and laser heating process to the high-strength steel according to the application: the soft area width of the high-strength steel is reduced by 30% compared with the martensitic steel, and the hardness loss of the region after the process treatment is low, so that higher forming hardness can be obtained, and the bending angle position is closer to the base material hardness.

[0017] Compared with conventional martensitic steel, the microstructure stability of the new high-strength steel part prepared by the process of the application is significantly improved: the carbide precipitation of the new high-strength steel is slower, and the martensitic structure is more stable, so that the hardness of the bending angle position can be higher.

[0018] In the process of the application, the anti-oxidation performance of the part is improved by combining the optimized laser heating parameters, the roll forming process and the specific component of the high-strength steel, the high-temperature oxidation problem is avoided, and the subsequent coating performance of the part can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The surface oxidation analysis results of the bending angle of the L-shaped steel part made of the high-strength steel in Example 1; Figure 2 The surface oxidation analysis results of the bending angle of the L-shaped steel part made of the martensitic steel in Comparative Example 1; Figure 3 The test results of the influence of laser-assisted roll forming on the microhardness of the bending angle of the martensitic steel and the high-strength steel; Figure 4 The schematic diagram of the processing device used in Example 1 for processing the steel plate; Figure 5 The surface oxidation analysis diagram of the bending angle of the L-shaped steel part made of the experimental steel A in Example 2; Figure 6 The comparison diagram of the microhardness of the bending part of the parts obtained by the laser heating process and the induction heating process; Figure 7 The SEM diagram of the bending angle center region of the experimental steel A formed by laser roll forming; Figure 8 The SEM diagram of the bending angle center region of the comparative steel D formed by laser roll forming.

[0020] Explanation of reference signs: 1 - clamp; 2 - rolling tool head; 3 - laser head; 4 - steel sheet. DETAILED DESCRIPTION

[0021] The application will be further described below in connection with embodiments so that those skilled in the art can carry out the application according to the description herein.

[0022] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0023] The test methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples are commercially available unless otherwise specified. The specific conditions not specified in the following examples are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not specified by the manufacturer, but are conventional products that can be purchased on the market. EXAMPLE

[0024] A laser-assisted forming process for an anti-oxidation high-strength steel part, the process uses high-strength steel to process a part, and in the processing process, when the part is bent and formed, the part is heated by laser at the local bending area. Specifically, in the processing process, the part is bent and formed after the local bending area of the part is heated by laser to form a laser-softened zone; the laser heating and bending forming are synchronous.

[0025] In this embodiment, the high-strength steel is denoted as, which includes, by mass fraction: C: 0.26, Si: 1.1%, Mn: 1.4%, Cr: 2.7%, Nb: 0.03%, the balance being Fe and unavoidable impurities. The tensile strength of the high-strength steel is not less than 1600 MPa, and the elongation is not less than 5% In this example, an L-shaped steel part is taken as an example for illustration, and the laser-assisted forming process used therein specifically includes the following steps: S1, continuously annealing the steel coil to obtain ultra-high-strength steel: S1-1, heating the steel sheet to 820°C at a heating rate of 10°C / s, and holding for 120 seconds; S1-2, then cooling to room temperature at a cooling rate of 2°C / s or higher to complete the heat treatment.

[0026] S2, using the heat-treated steel sheet to process a part, and in the processing process, the part is bent and formed by a rolling forming process, and at the same time, the part is heated by laser at the bending forming area.

[0027] For example, in this embodiment, as shown in Figure 4The shown processing device implements a roll forming process: the steel plate 4 is clamped and fixed by the clamp 1, and then a roll forming tool head 2 is used to move according to the target part shape to perform roll forming on the steel plate. During the roll forming process, the laser head 3 emitting laser is controlled to scan synchronously to assist heating of the bending forming area. Figure 4 The arrows indicate the direction of movement.

[0028] The laser head 3 can be fixed to the front side of the roll forming tool head 3, and both are driven forward by the same driving mechanism. Since the laser head 3 is located in front of the roll forming tool head 3, the laser head 3 can use laser to heat the local bending area of the part to form a laser softened zone, and then the roll forming tool head 2 behind it performs roll bending forming on the steel plate 4.

[0029] In step S2, the bending angle of the steel plate is 15° per pass of roll forming In step S2, the thickness of the steel plate in the bending forming area is 1.0 mm.

[0030] In step S2, during the roll forming process, the movement trajectory of the roll forming is controlled according to the target part shape, and the laser is controlled to scan synchronously on the bending forming area. The roll forming speed and the laser scanning speed are the same, both being 80 mm / s. The incident angle between the laser and the steel plate is 45°, the laser power is 1200w, and the maximum forming force of the roll forming is 1415N.

[0031] As shown in Figure 1 and Figure 3 The thickness of the oxidation layer of the local bending area after laser-assisted forming is less than 1μm, and the hardness loss of the local bending area is less than 10%. Embodiment

[0032] A laser-assisted forming process for an oxidation-resistant high-strength steel cap-shaped part, which uses high-strength steel to process parts. During the bending forming of the part, the local bending area of the part is heated synchronously using laser. The cap-shaped part includes but is not limited to a vehicle door bumper beam, a floor cross beam, a rocker beam, etc.

[0033] In this embodiment, the high-strength steel is referred to as experimental steel, and its chemical composition includes, by mass fraction: C: 0.26%, Si: 1.1%, Mn: 1.4%, Cr: 2.7%, Nb: 0.03%, the balance being Fe and unavoidable impurities. The tensile strength of the high-strength steel is not less than 1600MPa, and the elongation is not less than 5%.

[0034] In this example, a cap-shaped steel part is taken as an example for illustration, and the laser-assisted forming process used includes the following steps: S1, continuously anneal the steel coil; The high-strength steel is processed into a steel plate, and then heat treated, and the heat treatment step is: S1-1, heating the steel plate to 850°C at a heating rate of 10°C / s, and holding for 150 seconds; S1-2, then cooling to room temperature at a cooling rate of 2°C / s or higher, to complete the heat treatment.

[0035] S2, the steel plate after heat treatment is processed into a part, and in the processing, a roll forming process is used to bend and form the part, and at the same time, laser is used to synchronously heat the bending and forming area of the part.

[0036] For example, in this embodiment, the roll forming process is implemented using a processing device as shown in Figure 4 The steel plate 4 is clamped and fixed by the clamp 1, and then the roll forming tool head 2 is used to move according to the target part shape to roll form the steel plate, and in the process of roll forming, the laser head 3 emitting laser is controlled to synchronously scan to assist heating the bending and forming area. Figure 4 The arrows indicate the direction of movement.

[0037] In step S2, the bending angle of the steel plate is 10° per pass of roll forming.

[0038] In step S2, the thickness of the steel plate in the bending and forming area is 1.4 mm.

[0039] In step S2, in the process of roll forming, the movement trajectory of roll forming is controlled according to the target part shape, and the laser is controlled to synchronously scan the bending and forming area, the roll forming speed and the laser scanning speed are the same, both are 150 mm / s; the incident angle between the laser and the steel plate is 60°, the laser power is 1200w, and the maximum forming force of roll forming is 2037N.

[0040] The thickness of the oxide layer in the local bending area after laser-assisted forming is less than 1μm, and the hardness loss of the local bending area is less than 15%. Embodiment

[0041] A laser-assisted forming process for an oxidation-resistant high-strength steel closed-section part, which uses high-strength steel to process a part, and in the process of bending and forming the part, laser is used to synchronously heat the local bending area of the part. The closed-section part includes but is not limited to a battery pack frame, a bumper reinforcement, etc.

[0042] In this embodiment, the high-strength steel is referred to as experimental steel, and its chemical composition includes, by mass fraction: C: 0.28%, Si: 0.4%, Mn: 2.0%, Cr: 2.5%, Nb: 0.03%, the balance being Fe and unavoidable impurities.

[0043] The high-strength steel has a tensile strength of not less than 1600 MPa and an elongation of not less than 5%.

[0044] In this example, a closed-section steel part is used as an example to illustrate the laser-assisted forming process, which specifically includes the following steps: S1. Continuous annealing of the steel coil; S1-1. High-strength steel is processed into steel plates, and then heat-treated. The heat treatment steps are as follows: S1-2. Heat the steel plate to 820℃ at a heating rate of 10℃ / s and hold for 180 seconds. S1-3, then cool down to 465℃ at a cooling rate of 10℃ / s and hold for 45 seconds; S1-4. Allow to cool naturally to room temperature to complete the heat treatment.

[0045] S2. The parts are made from heat-treated steel plates. During the processing, the parts are bent and formed by roll forming. At the same time as roll forming, the bending area of ​​the parts is heated by laser.

[0046] For example, in this embodiment, the following is used: Figure 4 The processing device shown implements a roll forming process: the steel plate 4 is clamped and fixed by the fixture 1, and then the roll forming tool head 2 moves according to the shape of the target part to roll form the steel plate. During the roll forming process, the laser head 3 that emits laser light scans synchronously to provide auxiliary heating to the bending forming area; the arrow in the figure indicates the direction of movement.

[0047] In step S2, the bending angle of the steel plate is 10° for each roll forming pass. In step S2, the thickness of the steel plate in the bending forming area is 1.0 mm.

[0048] In step S2, during the roll forming process, the motion trajectory of the roll forming is controlled according to the shape of the target part, and the laser is controlled to scan the bending forming area synchronously. The roll forming rate and the laser scanning rate are the same, both being 120 mm / s; the incident angle between the laser and the steel plate is 40°, the laser power is 900 W, and the maximum forming force of the roll forming is 1246 N.

[0049] The oxide layer thickness of the locally bent area after laser-assisted forming is 2-3 μm, and the hardness loss of the locally bent area is less than 18%.

[0050] The only difference between this comparative example and Example 1 is that: In this comparative example, conventional comparative steel D (martensitic steel) was used instead of experimental steel A (high-strength steel) in Example 1. The chemical compositions of Example 1 and Comparative Example 1 are shown in Table 1 below.

[0051]

[0052] The L-shaped steel parts prepared from the experimental steel A of Example 1 and the comparative steel D of Comparative Example 1 were subjected to the following comparative analysis to further illustrate the present application.

[0053] 1. Oxidation analysis after laser-assisted roll forming Figure 1 The surface oxidation analysis results of the L-shaped steel part prepared from the experimental steel A of Example 1 at the corner of the bend are shown in (a) SEM full view of the corner section, (b) oxidation layer morphology, and (c) EDS surface analysis. From Figure 1 As can be seen from (b), the oxidation layer of the experimental steel A at the corner position is very thin, much less than 1 μm, and it is difficult to accurately measure under FE-SEM. When the thickness of the oxidation layer is much less than 1 μm, the part can be directly subjected to coating treatment.

[0054] Figure 2 The surface oxidation analysis results of the L-shaped steel part prepared from the comparative steel D of Comparative Example 1 at the corner of the bend are shown in (a) SEM full view of the corner section, and (b) oxidation layer morphology. From Figure 2 As can be seen from (b), the comparative steel D forms a high-temperature oxidation layer of 5-10 μm thick at the corner position, and the hardness loss of the local bending area is greater than 30% (Hv). Figure 3 In the subsequent production process, shot blasting treatment is needed to remove the oxide scale to ensure good coating adhesion and corrosion resistance after coating.

[0055] 2. Analysis of the soft zone at the corner after laser-assisted roll forming Figure 3 The test results of the effect of laser-assisted roll forming on the microhardness at the corner of the comparative steel D and the experimental steel A are shown in the right part of the figure. The test results show that the soft zone width of the comparative steel D is 7 mm, while the soft zone width of the experimental steel A is 4 mm, which is about 42.8% less than that of the comparative steel D.

[0056] At the same time, the minimum hardness of the comparative steel D decreases to below 250 Hv, while the minimum hardness of the experimental steel A remains above 400 Hv. According to the test results, the softening degree of the comparative steel D exceeds 50%, while the softening degree of the experimental steel A is not higher than 20%. In summary, the soft zone width of the experimental steel A after laser-assisted roll forming is significantly smaller than that of the comparative steel D, and the softening degree is much lower than that of the comparative steel D.

[0057] 3. Microstructure evolution at the corner after laser-assisted roll forming Referring to Figure 7which shows the representative microstructure of the center region of the corner of the experimental steel A after laser-assisted roll forming. After laser-assisted roll forming, in this region, the microstructure can be observed to be lath martensite. Compared with the initial microstructure, more fine and uniformly distributed spherical carbide particles are observed to be dispersed in the interlath space of the lath martensite, and fine carbides are observed to precipitate at the martensite bundle interface, block interface and prior austenite grain boundary. The above microstructure characteristics reflect that the martensite in this region has a certain tempering, but the tempering degree is relatively low, which is consistent with the microhardness of about 450 HV in this region shown in Figure 3 . Along the direction away from the center of the corner, the lath structure of the martensite in the microstructure of the experimental steel A is more clear, the amount of carbide precipitation is reduced, and the corresponding microhardness gradually increases to more than 500 HV (see Figure 3 ).

[0058] In contrast, the comparative steel D has undergone a more significant tempering process in the center region of the corner after laser-assisted roll forming. The lath structure characteristics in this region have tended to disappear, and a large amount of cementite is observed to precipitate at the martensite bundle boundary, martensite block interface and prior austenite grain boundary (see Figure 8 ), which is consistent with the test result that the hardness value is less than 250 HV in Figure 3 . As the distance from the center of the corner increases, the softening degree of the microstructure of the comparative steel D gradually decreases. When the distance from the center is about 3 mm, the microstructure characteristics are similar to low-temperature tempered martensite, which is characterized by clear lath structure. Compared with the original microstructure, a large number of feather-like transition carbides are formed in the lath at this time, and at this time, the hardness value increases to more than 400 HV.

[0059] In summary, in the laser-assisted roll forming process of the experimental steel A, the martensite structure is more stable, so the softening zone is narrower and the softening degree is lower. The main reason is that the content of Cr and Si alloy elements in the experimental steel is higher, and the diffusion speed of these alloy elements in the steel is slower, which inhibits the formation and growth of carbides, and finally improves the tempering resistance of the martensite.

[0060] The difference between this example and example 1 is only that: Compared with the laser heating method of example 1, the induction heating method is used instead of the laser heating treatment method, and the heating treatment method parameters of example 1 and comparative example 1 are as follows.

[0061]

[0062] The L-shaped steel parts prepared based on the same experimental steel A of example 1 and comparative example 2 are analyzed as follows to further illustrate the present application.

[0063] Oxidation analysis after forming by two processes Figure 5 The results of surface oxidation analysis of the L-shaped steel part of the experimental steel A in Example 2 at the bending corner, and the results of surface oxidation analysis of the part at the bending corner made by the induction heating method in Comparative Example 2: (a) SEM photograph of the cross section of the bending corner in Example 2, (b) SEM photograph of the cross section of the bending corner in Comparative Example 2; From Figure 5 As can be seen in (a), the part obtained by laser heating bending has an oxidation layer thickness of only 2 mm, while the part obtained by induction heating bending shown in (b) has an oxidation layer thickness of 4 mm or more, which is one or more times the oxidation layer thickness of the part obtained by the laser heating process. Figure 5

[0064] 2. Analysis of the soft zone at the bending corner after forming by the two processes Figure 6 For comparison of the microhardness of the parts at the bending corner obtained by the laser heating process and the induction heating process, it can be clearly seen that the microhardness of the laser heating part at the bending corner is slightly greater than that of the base material region, with a maximum value of 506 HV, while the microhardness of the base material region is about 450 HV, which is increased by about 12.4%, and the microhardness of the heat affected zone is only slightly decreased; while the microhardness of the induction heating part at the bending zone and the heat affected zone is lower than that of the base material, and the microhardness of the bending zone is about 271 HV, which is decreased by about 40% compared with the base material region. It can be concluded that the laser heating bending process has less effect on the microhardness of the base material, i.e. less effect on the mechanical properties of the bending region, and even the microhardness is increased in a certain region.

[0065] 3. Microstructure evolution at the bending corner after forming by the two processes In order to analyze the different softening behaviors of the two processes during forming, the microstructure of the parts at the bending corner obtained by the two processes can be observed.

[0066] The microhardness of the part obtained by the induction heating process is U-shaped, indicating that there is tempered martensite in this region, and the hardness is between 200 and 300 HV. While the microhardness of the part obtained by the laser heating process at the bending corner is increased to 500 HV, indicating that there is a fresh martensite region at the bending center. This hardness increase corresponds to the microstructure gradient along the thickness direction of the bending region, which is due to the high temperature experienced by the outer layer (i.e. the region directly heated by the laser).

[0067] Although the embodiments of the present application have been disclosed as above, they are not limited to the application described and illustrated in the specification and examples, and can be fully applied to various fields suitable for the present application, and further modifications can be easily made by those skilled in the art, and therefore the present application is not limited to specific details, but is within the general concept defined by the claims and their equivalents.​

Claims

1. A laser assisted shaping process of an anti-oxidation high-strength steel part, characterized in that, The process adopts high-strength steel to process a part; in the process, a laser is used to heat a local bending area of the part to form a laser softened area, and then the part is bent and formed; laser heating and bending forming are simultaneously performed; The high-strength steel comprises Si and Cr in the chemical composition, and the content of Si is 0.3-2.0% and the content of Cr is 1.5-3% by mass fraction, and the total content of Si and Cr is 2.0-4.5%. The high-strength steel has a tensile strength of not less than 1600 MPa, an elongation of not less than 5%, an oxidation layer thickness of the local bending area after laser-assisted forming of less than 3 μm, and a hardness loss of the local bending area of not more than 20%.

2. Laser-assisted forming process of an anti-oxidation high-strength steel part according to claim 1, characterized in that, The chemical composition of the high-strength steel comprises, by mass fraction: C: 0.20-0.45%, Si: 0.3-2.0%, Mn: 0.7-3.0%, Cr: 1.5-2.5%, Nb: 0.01-0.06%, and the balance of Fe and inevitable impurities.

3. Laser-assisted forming process of an anti-oxidation high-strength steel part according to claim 2, characterized in that, The chemical composition of the high-strength steel comprises, by mass fraction: C: 0.26, Si: 1.1%, Mn: 1.4%, Cr: 2.7%, Nb: 0.03%, and the balance of Fe and inevitable impurities.

4. Laser-assisted forming process of an anti-oxidation high-strength steel part according to claim 1, characterized in that, The process comprises the following steps: S1, using high-strength steel to process a steel plate, and then performing heat treatment; S2, using the heat-treated steel plate to process a part, and in the process, using a roll forming process to bend and form the part, and simultaneously using a laser to heat a bending forming area of the part.

5. Laser-assisted forming process of an anti-oxidation high-strength steel part according to claim 4, characterized in that, In step S2, the bending angle of the steel plate is 2-20° per pass of roll forming.

6. Laser-assisted forming process of an anti-oxidation high-strength steel part according to claim 4, characterized in that, In step S2, the thickness of the steel plate in the bending forming area is 0.5-2.0 mm.

7. Laser-assisted forming process of an anti-oxidation high-strength steel part according to claim 4, characterized in that, In step S2, the laser power is 500-2000 W.

8. Laser-assisted forming process of an anti-oxidation high-strength steel part according to claim 4, characterized in that, In step S2, during the roll forming process, the motion trajectory of the roll forming is controlled according to the shape of the target part, and the laser is controlled to synchronously scan the bending forming area, and the roll forming speed and the laser scanning speed are the same, both being 10-200 mm / s.

9. Laser-assisted forming process of an anti-oxidation high-strength steel part according to claim 8, characterized in that, The maximum forming force of the roll forming is 800-3000 N.

10. Laser-assisted forming process of an anti-oxidation high-strength steel part according to claim 4, characterized in that, In step S2, the thickness of the steel plate in the bending forming area is 0.8-1.4 mm; the laser power is 800-1500 W, and the laser scanning speed is 50-100 mm / s; and the maximum forming force of the roll forming is 1000-2000 N.

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