Method for manufacturing a three-cavity roll-shaped profile

Abstract

The application provides a preparation method of a three-cavity structure roll-pressed profile, which comprises the following steps: roll-pressing and bending a steel strip to form first and second bent corner structures; roll-pressing and bending the bent corner structures to form third and fourth bent corner structures; roll-pressing and bending the first to fourth bent corner structures to form fifth and sixth bent corner structures; roll-pressing and bending the third to sixth bent corner structures to form seventh and eighth bent corner structures; roll-pressing and bending the seventh and eighth bent corner structures; roll-pressing and bending to form ninth to eleventh bent corner structures; roll-pressing and bending the tenth and eleventh bent corner structures; laser welding the first end portion bonding site and the second end portion bonding site; back-bending roll-pressing and bending; and laser welding the third end portion and the fourth end portion. The application does not need subsequent tailor-welding processing procedures, reduces personnel and equipment investment, does not increase additional energy consumption during production, and reduces cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of roll-formed section, in particular to a preparation method of a roll-formed section with three cavity structures. BACKGROUND

[0002] As Figure 12 and Figure 13 are schematic diagrams of two existing section structures. Among them Figure 12 is an aluminum section, which is an L-shaped structure with three cavities. Its main preparation process is aluminum extrusion process. Although the manufacturing process is simple, the aluminum section has low strength (about 200 MPa), and collapses when it encounters external impact. Due to the material properties, the strength cannot be improved. At the same time, due to the high material cost of the aluminum section, it is urgent to reduce the cost when the market demand is huge. Therefore, high-strength steel sections are needed to replace aluminum sections, and Figure 12 the structure in cannot be prepared by roll forming process.

[0003] Figure 13 The section structure in is a steel section structure, which also has an L-shaped structure with three cavities. However, the processing procedure is long, and the welding equipment investment is large. The preparation method includes the following steps: first, roll forming into a day-shaped section; second, off-line butt welding of the day-shaped roll-formed section and the square rectangular tube. Four times of welding are required in the structure, the heat input is large, the size and welding control are difficult in product production, and the product weight is large due to the double-layer material at the butt welding position. Figure 13 The structure in cannot be prepared by roll forming process at one time.

[0004] Therefore, it is necessary to design a preparation method of a roll-formed steel section with a multi-cavity L-shaped structure to solve the above technical problems. SUMMARY

[0005] In view of the defects in the prior art, the purpose of the present application is to provide a preparation method of a roll-formed section with three cavity structures.

[0006] According to the preparation method of the roll-formed section with three cavity structures provided by the present application, the following steps are included:

[0007] Step 1: simultaneously roll bending the two ends of the steel strip by the roll forming device to form a first bend angle structure and a second bend angle structure at the two ends of the steel strip;

[0008] Step 2: roll bending the first bend angle structure and the second bend angle structure by the roll forming device to form a third bend angle structure and a fourth bend angle structure at the two ends of the steel strip, and forming a first connecting part, a second connecting part, a first end part and a second end part;

[0009] Step 3: The first corner structure, the second corner structure, the third corner structure and the fourth corner structure are rolled and bent by the rolling device to form a fifth corner structure and a sixth corner structure on the steel strip, and to form a third end portion and a fourth end portion;

[0010] Step 4: The third corner structure, the fourth corner structure, the fifth corner structure and the sixth corner structure are rolled and bent by the rolling device to form a seventh corner structure and an eighth corner structure on the steel strip, and to form a first connecting arm and a second connecting arm;

[0011] Step 5: The seventh corner structure and the eighth corner structure are rolled and bent;

[0012] Step 6: The middle portion of the steel strip is rolled and bent by the rolling device to form a ninth corner structure, and the tenth corner structure and the eleventh corner structure are rolled and bent on the steel strip to form a third connecting arm and a fourth connecting arm;

[0013] Step 7: The tenth corner structure and the eleventh corner structure are rolled and bent by the rolling device, so that the first end portion abuts against the steel strip and the second end portion abuts against the steel strip; a fifth connecting arm and a sixth connecting arm are formed;

[0014] Step 8: The first end portion and the fifth connecting arm are connected, and the second end portion and the sixth connecting arm are connected by laser welding;

[0015] Step 9: The ninth corner structure is rolled and bent by the rolling device, so that the third end portion abuts against the fourth end portion; a seventh connecting arm and an eighth connecting arm are formed;

[0016] Step 10: The third end portion and the fourth end portion are connected by laser welding.

[0017] Preferably, before the steel strip is rolled and bent in step 1, the steel strip is flattened by a flattening device.

[0018] Preferably, step 3 is specifically:

[0019] Step 3.1: The first corner structure, the second corner structure, the third corner structure and the fourth corner structure are rolled and bent by the rolling device to adjust the corner angles of the first corner structure, the second corner structure, the third corner structure and the fourth corner structure;

[0020] Step 3.2: The first corner structure and the second corner structure are rolled and bent by the rolling device to form a fifth corner structure and a sixth corner structure on the steel strip, and to form a third end portion and a fourth end portion;

[0021] Meanwhile, the third corner structure and the fourth corner structure are rolled and bent to adjust the corner angles of the third corner structure and the fourth corner structure.

[0022] Preferably, the step 4 is specifically as follows:

[0023] Step 4.1: simultaneously roll-bend the third, fourth, fifth and sixth corner structures by the roll-bending device to adjust the corner angles of the third, fourth, fifth and sixth corner structures; the corner angles of the third and fourth corner structures are 90 degrees, and the corner angles of the fifth and sixth corner structures are 150 degrees;

[0024] Step 4.2: roll-bend the fifth and sixth corner structures by the roll-bending device to adjust the corner angles of the fifth and sixth corner structures; the corner angles of the fifth and sixth corner structures are 135 degrees;

[0025] Step 4.3: roll-bend the fifth and sixth corner structures by the roll-bending device to form seventh and eighth corner structures on the steel belt, and form the first and second connecting arms; the corner angles of the fifth and sixth corner structures are 135 degrees, and the corner angles of the seventh and eighth corner structures are 170 degrees.

[0026] Preferably, the step 5 is specifically as follows:

[0027] Step 5.1: roll-bend the seventh and eighth corner structures to adjust the corner angles of the seventh and eighth corner structures; the corner angles of the seventh and eighth corner structures are 155 degrees;

[0028] Step 5.2: roll-bend the seventh and eighth corner structures to adjust the corner angles of the seventh and eighth corner structures; the corner angles of the seventh and eighth corner structures are 135 degrees;

[0029] Step 5.3: roll-bend the seventh and eighth corner structures to adjust the corner angles of the seventh and eighth corner structures; the corner angles of the seventh and eighth corner structures are 110 degrees;

[0030] Step 5.4: roll-bend the seventh corner structure to adjust the corner angle of the seventh corner structure; the corner angle of the seventh corner structure is 90 degrees;

[0031] Step 5.5: roll-bend the eighth corner structure to adjust the corner angle of the eighth corner structure; the corner angle of the eighth corner structure is 90 degrees.

[0032] Preferably, the step 6 is specifically as follows:

[0033] Step 6.1: The middle part of the steel strip is rolled and bent by a rolling device to form a ninth corner structure; the bending angle of the ninth corner structure is 200 degrees;

[0034] Step 6.2: The ninth corner structure is rolled and bent by a rolling device to form a tenth corner structure and an eleventh corner structure on the steel strip, form a third connecting arm and a fourth connecting arm, and adjust the bending angle of the ninth corner structure; the bending angle of the ninth corner structure is 230 degrees, and the bending angles of the tenth corner structure and the eleventh corner structure are 165 degrees.

[0035] Preferably, the step 7 is specifically:

[0036] Step 7.1: The tenth corner structure and the eleventh corner structure are rolled and bent by a rolling device to adjust the bending angles of the tenth corner structure and the eleventh corner structure; the bending angles of the tenth corner structure and the eleventh corner structure are 155 degrees;

[0037] Step 7.2: The eleventh corner structure is rolled and bent by a rolling device to adjust the bending angle of the eleventh corner structure; the bending angle of the eleventh corner structure is 135 degrees;

[0038] Step 7.3: The tenth corner structure is rolled and bent by a rolling device to adjust the bending angle of the tenth corner structure; the bending angle of the tenth corner structure is 135 degrees;

[0039] Step 7.4: The eleventh corner structure is rolled and bent by a rolling device to adjust the bending angle of the eleventh corner structure; the bending angle of the eleventh corner structure is 110 degrees;

[0040] Step 7.5: The tenth corner structure is rolled and bent by a rolling device to adjust the bending angle of the tenth corner structure; the bending angle of the tenth corner structure is 110 degrees;

[0041] Step 7.6: The tenth corner structure and the eleventh corner structure are rolled and bent by a rolling device to adjust the bending angles of the tenth corner structure and the eleventh corner structure; the first end abuts on the steel strip, the second end abuts on the steel strip, a fifth connecting arm and a sixth connecting arm are formed; the bending angle of the tenth corner structure is 90 degrees, and the bending angle of the eleventh corner structure is 90 degrees.

[0042] Preferably, the step 9 is specifically:

[0043] Step 9.1: The ninth corner structure is rolled and bent by a rolling device to adjust the bending angle of the ninth corner structure; the bending angle of the ninth corner structure is 200 degrees;

[0044] Step 9.2: the ninth corner structure is positively bent by a roller pressing device to adjust the corner angle of the ninth corner structure; the corner angle of the ninth corner structure is 170 degrees;

[0045] Step 9.3: the ninth corner structure is reversely bent by a roller pressing device to adjust the corner angle of the ninth corner structure; the corner angle of the ninth corner structure is 180 degrees;

[0046] Step 9.4: the ninth corner structure is bent by a roller pressing device to adjust the corner angle of the ninth corner structure; the corner angle of the ninth corner structure is 160 degrees; the seventh connecting arm and the eighth connecting arm are formed;

[0047] Step 9.5: the ninth corner structure is bent by a roller pressing device to adjust the corner angle of the ninth corner structure; the corner angle of the ninth corner structure is 130 degrees;

[0048] Step 9.6: the ninth corner structure is bent by a roller pressing device to adjust the corner angle of the ninth corner structure; the corner angle of the ninth corner structure is 110 degrees;

[0049] Step 9.7: the ninth corner structure is bent by a roller pressing device to adjust the corner angle of the ninth corner structure, so that the second end portion abuts against the fourth end portion; the corner angle of the ninth corner structure is 90 degrees.

[0050] Preferably, in the step 1, the corner angles of the first corner structure and the second corner structure are 165 degrees;

[0051] In the step 2, the corner angles of the first corner structure and the second corner structure are 150 degrees; the corner angles of the third corner structure and the fourth corner structure are 165 degrees;

[0052] In the step 3.1, the corner angles of the first corner structure and the second corner structure are 135 degrees; the corner angles of the third corner structure and the fourth corner structure are 150 degrees;

[0053] In the step 3.2, the corner angles of the third corner structure and the fourth corner structure are 120 degrees.

[0054] Preferably, in the step 1, the strength of the steel strip is above 600 MPa, and the steel strip is continuously flattened by a 21-roller flattening device.

[0055] Compared with the prior art, the present application has the following beneficial effects:

[0056] 1. The preparation method of the application uses high-strength steel strips as raw materials to prepare a three-cavity structure, which has reinforcing rib structures in the X and Y directions, and uses laser welding to roll the profile, which can replace the original aluminum profile with the same structure, as well as the spliced steel profile in the shape of a day and a mouth, and the integrally formed rolled high-strength profile prepared by the application has good strength and rigidity performance, and improves the collision and energy absorption performance of the structure in the X and Y directions;

[0057] 2. In the preparation method of the application, the three-cavity structure similar to the aluminum profile is formed in the structure, first, closed cavity structures are formed on both sides, a closed cavity is formed at one corner, two rolled corner angles are formed, and a plane at a certain angle to the cavity is formed between the two corner angles, the plane is set at a certain angle, which is more conducive to welding in the subsequent welding process, the laser beam can be perpendicular to the bonding surface, causing minimal damage to the material, and a fusion zone is formed at the bonding surface, the optimal angle is 45 degrees, and finally, after the two planes are bonded to each other, a third closed cavity is formed, and the structure is in a symmetrical form when optimal;

[0058] 3. In the preparation method of the application, reinforcing support ribs are arranged in the X and Y directions of the structure, and the two cavities formed in advance are connected by laser welding at the bonding position, which ensures the strength and rigidity of the structure and improves the collision and energy absorption performance of the structure, compared with spliced steel profiles and aluminum profiles, the weight is light, and collapse and material failure are less likely to occur when a collision occurs;

[0059] 4. The application selects high-strength steel with a strength of 600 MPa or more, and uses advanced roll forming process to form an integral structure online, which has good product quality, stable production and high efficiency;

[0060] 5. Compared with the spliced steel profile, the preparation method of the application does not have subsequent splicing processing procedures, reduces personnel and equipment investment, does not increase additional energy consumption during production, and reduces costs. BRIEF DESCRIPTION OF DRAWINGS

[0061] Other features, objects and advantages of the application will become more apparent after reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0062] Figure 1 The step flow chart of the preparation method of the three-cavity structure roll profile of the application;

[0063] Figure 2 The processing schematic of the first to eighth passes of the preparation method of the three-cavity structure roll profile in an embodiment Figure 1 ;

[0064] Figure 3This is a schematic diagram of the first to eighth processing steps in the method for preparing a three-cavity roll-formed profile according to one embodiment. Figure 2 ;

[0065] Figure 4 This is a schematic diagram of the 9th to 16th processing steps in the method for preparing a three-cavity roll-formed profile according to one embodiment. Figure 1 ;

[0066] Figure 5 This is a schematic diagram of the 9th to 16th processing steps in the method for preparing a three-cavity roll-formed profile according to one embodiment. Figure 2 ;

[0067] Figure 6 This is a schematic diagram of the 17th to 24th processing steps in the method for preparing a three-cavity roll-formed profile according to one embodiment. Figure 1 ;

[0068] Figure 7 This is a schematic diagram of the 17th to 24th processing steps in the method for preparing a three-cavity roll-formed profile according to one embodiment. Figure 2 ;

[0069] Figure 8 This is a schematic diagram of the 25th to 30th processing steps in the method for preparing a three-cavity roll-formed profile according to one embodiment. Figure 1 ;

[0070] Figure 9 This is a schematic diagram of the 25th to 30th processing steps in the method for preparing a three-cavity roll-formed profile according to one embodiment. Figure 2 ;

[0071] Figure 10 This is a schematic diagram of the cavity profile structure prepared by the three-cavity roll forming method in one embodiment. Figure 1 ;

[0072] Figure 11 This is a schematic diagram of the cavity profile structure prepared by the three-cavity roll forming method in one embodiment. Figure 2 ;

[0073] Figure 12 and Figure 13 Schematic diagrams of two profile structures prepared by existing methods.

[0074] The diagram shows:

[0075] First bend structure 1, second end 15

[0076] Second bend structure 2 Third end 16

[0077] Third bend structure 3 Fourth end 17

[0078] Fourth bend structure 4 First connecting arm 18

[0079] Fifth bend structure 5 Second connecting arm 19

[0080] Sixth bend angle structure 6, third connecting arm 20

[0081] Seventh bend structure 7 Fourth connecting arm 21

[0082] Eighth bend structure 8, fifth connecting arm 22

[0083] Ninth bend structure 9 Sixth connecting arm 23

[0084] Tenth bend structure 10, seventh connecting arm 24

[0085] Eleventh bend structure 11 Eighth connecting arm 25

[0086] First connecting part 12 First cavity 26

[0087] Second connecting part 13 Second cavity 27

[0088] First end 14 Third cavity 28 Detailed Implementation

[0089] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0090] Example 1:

[0091] like Figures 1-11 As shown, this embodiment provides a method for preparing a three-cavity roll-formed profile, including the following steps:

[0092] Step 1: Roller bend both ends of the steel strip simultaneously using a roller bending device to form a first bend structure 1 and a second bend structure 2 at both ends of the steel strip, respectively; before roller bending the steel strip, a leveling device is used to level the steel strip; the bend angles of the first bend structure 1 and the second bend structure 2 are 165 degrees; the strength of the steel strip is above 600MPa, and a 21-roller leveling device is used to continuously level the steel strip.

[0093] Step 2: The first bend structure 1 and the second bend structure 2 are rolled and bent by a roller pressing device to form a third bend structure 3 and a fourth bend structure 4 at both ends of the steel strip, forming a first connecting part 12, a second connecting part 13, a first end 14 and a second end 15; the bending angle of the first bend structure 1 and the second bend structure 2 is 150 degrees; the bending angle of the third bend structure 3 and the fourth bend structure 4 is 165 degrees; the third bend structure 3 is formed on the first bend structure 1 and is located at the end of the steel strip, and the fourth bend structure 4 is formed on the second bend structure 2 and is located at the end of the steel strip.

[0094] Step 3: The first bend structure 1, the second bend structure 2, the third bend structure 3, and the fourth bend structure 4 are rolled and bent using a roller pressing device to form the fifth bend structure 5 and the sixth bend structure 6 on the steel strip, forming the third end 16 and the fourth end 17; Step 3 specifically involves:

[0095] Step 3.1: Roller bend the first bend structure 1, the second bend structure 2, the third bend structure 3, and the fourth bend structure 4 using a roller pressing device, and adjust the bending angles of the first bend structure 1, the second bend structure 2, the third bend structure 3, and the fourth bend structure 4; the bending angles of the first bend structure 1 and the second bend structure 2 are 135 degrees; the bending angles of the third bend structure 3 and the fourth bend structure 4 are 150 degrees.

[0096] Step 3.2: The first bend structure 1 and the second bend structure 2 are rolled and bent by a roller pressing device to form the fifth bend structure 5 and the sixth bend structure 6 on the steel strip, forming the third end 16 and the fourth end 17.

[0097] Simultaneously, the third bend structure 3 and the fourth bend structure 4 are rolled and bent to adjust their bending angles; the bending angles of the third bend structure 3 and the fourth bend structure 4 are 120 degrees; the fifth bend structure 5 is formed on the side of the first bend structure 1 away from the third bend structure 3, and the sixth bend structure 6 is formed on the side of the second bend structure 2 away from the fourth bend structure 4.

[0098] Step 4: The third bend structure 3, the fourth bend structure 4, the fifth bend structure 5, and the sixth bend structure 6 are rolled and bent using a roller pressing device to form the seventh bend structure 7 and the eighth bend structure 8 on the steel strip, thus forming the first connecting arm 18 and the second connecting arm 19; Step 4 specifically involves:

[0099] Step 4.1: Simultaneously roll-bend the third bend structure 3, the fourth bend structure 4, the fifth bend structure 5, and the sixth bend structure 6 using a roller pressing device, and adjust the bending angles of the third bend structure 3, the fourth bend structure 4, the fifth bend structure 5, and the sixth bend structure 6; the bending angle of the third bend structure 3 and the fourth bend structure 4 is 90 degrees, and the bending angle of the fifth bend structure 5 and the sixth bend structure 6 is 150 degrees;

[0100] Step 4.2: Roller bend the fifth bend structure 5 and the sixth bend structure 6 using a roller pressing device, and adjust the bending angle of the fifth bend structure 5 and the sixth bend structure 6 to 135 degrees.

[0101] Step 4.3: The fifth bend structure 5 and the sixth bend structure 6 are rolled and bent by a roller pressing device to form the seventh bend structure 7 and the eighth bend structure 8 on the steel strip, forming the first connecting arm 18 and the second connecting arm 19; the bending angle of the fifth bend structure 5 and the sixth bend structure 6 is 135 degrees, and the bending angle of the seventh bend structure 7 and the eighth bend structure 8 is 170 degrees; the seventh bend structure 7 is formed on the side of the fifth bend structure 5 away from the first bend structure 1, and the eighth bend structure 8 is formed on the side of the sixth bend structure 6 away from the second bend structure 2.

[0102] Step 5: Roller bending of the seventh bend structure 7 and the eighth bend structure 8; Step 5 specifically involves:

[0103] Step 5.1: Roller bend the seventh bend structure 7 and the eighth bend structure 8, and adjust the bending angle of the seventh bend structure 7 and the eighth bend structure 8; the bending angle of the seventh bend structure 7 and the eighth bend structure 8 is 155 degrees;

[0104] Step 5.2: Roller bend the seventh bend structure 7 and the eighth bend structure 8, and adjust the bending angle of the seventh bend structure 7 and the eighth bend structure 8; the bending angle of the seventh bend structure 7 and the eighth bend structure 8 is 135 degrees;

[0105] Step 5.3: Roller bend the seventh bend structure 7 and the eighth bend structure 8, and adjust the bending angle of the seventh bend structure 7 and the eighth bend structure 8; the bending angle of the seventh bend structure 7 and the eighth bend structure 8 is 110 degrees;

[0106] Step 5.4: Roll bend the seventh corner structure 7 and adjust the bending angle of the seventh corner structure 7; the bending angle of the seventh corner structure 7 is 90 degrees.

[0107] Step 5.5: Roll bend the eighth corner structure 8 and adjust the bending angle of the eighth corner structure 8; the bending angle of the eighth corner structure 8 is 90 degrees.

[0108] Step 6: The middle part of the steel strip is rolled and bent using a roller pressing device to form the ninth bend structure 9. The tenth bend structure 10 and the eleventh bend structure 11 are then rolled and bent on the steel strip, forming the third connecting arm 20 and the fourth connecting arm 21. Specifically, Step 6 involves:

[0109] Step 6.1: The middle part of the steel strip is rolled and bent by a roller pressing device to form the ninth bend structure 9; the bend angle of the ninth bend structure 9 is 200 degrees.

[0110] Step 6.2: The ninth bend structure 9 is rolled and bent by a roller pressing device to form the tenth bend structure 10 and the eleventh bend structure 11 on the steel strip, forming the third connecting arm 20 and the fourth connecting arm 21. The bending angle of the ninth bend structure 9 is adjusted; the bending angle of the ninth bend structure 9 is 230 degrees, and the bending angles of the tenth bend structure 10 and the eleventh bend structure 11 are 165 degrees; the ninth bend structure 9 is formed between the seventh bend structure 7 and the eighth bend structure 8.

[0111] Step 7: The tenth bend structure 10 and the eleventh bend structure 11 are rolled and bent using a roller pressing device, so that the first end 14 abuts against the steel strip and the second end 15 abuts against the steel strip; forming the fifth connecting arm 22 and the sixth connecting arm 23; Step 7 specifically involves:

[0112] Step 7.1: Roller bend the tenth bend structure 10 and the eleventh bend structure 11 using a roller pressing device, and adjust the bending angle of the tenth bend structure 10 and the eleventh bend structure 11; the bending angle of the tenth bend structure 10 and the eleventh bend structure 11 is 155 degrees.

[0113] Step 7.2: Roller bend the eleventh bend structure 11 using a roller pressing device, and adjust the bend angle of the eleventh bend structure 11; the bend angle of the eleventh bend structure 11 is 135 degrees.

[0114] Step 7.3: Roller bend the tenth bend structure 10 using a roller pressing device, and adjust the bending angle of the tenth bend structure 10; the bending angle of the tenth bend structure 10 is 135 degrees.

[0115] Step 7.4: Roller bend the eleventh bend structure 11 using a roller pressing device, and adjust the bend angle of the eleventh bend structure 11; the bend angle of the eleventh bend structure 11 is 110 degrees.

[0116] Step 7.5: Roller bend the tenth bend structure 10 using a roller pressing device, and adjust the bend angle of the tenth bend structure 10; the bend angle of the tenth bend structure 10 is 110 degrees.

[0117] Step 7.6: Roller bend the tenth bend structure 10 and the eleventh bend structure 11 using a roller pressing device, and adjust the bending angles of the tenth bend structure 10 and the eleventh bend structure 11; so that the first end 14 abuts against the steel strip and the second end 15 abuts against the steel strip, forming the fifth connecting arm 22 and the sixth connecting arm 23; the bending angle of the tenth bend structure 10 is 90 degrees and the bending angle of the eleventh bend structure 11 is 90 degrees; the tenth bend structure 10 is formed between the ninth bend structure 9 and the seventh bend structure 7, and the eleventh bend structure 11 is formed between the ninth bend structure 9 and the eighth bend structure 8.

[0118] Step 8: Perform laser welding on the connection between the first end 14 and the fifth connecting arm 22, and the connection between the second end 15 and the sixth connecting arm 23; forming the first cavity 26 and the second cavity 27; Step 8 specifically involves:

[0119] Step 8.1: Perform laser welding on the connection between the first end 14 and the fifth connecting arm 22 to form the first cavity 26;

[0120] Step 8.2: Perform laser welding on the connection between the second end 15 and the sixth connecting arm 23 to form the second cavity 27.

[0121] Step 9: The ninth bend structure 9 is rolled and bent using a roller pressing device, so that the third end 16 and the fourth end 17 abut together; forming the seventh connecting arm 24 and the eighth connecting arm 25; Step 9 specifically involves:

[0122] Step 9.1: The ninth bend structure 9 is reverse-bending and rolled using a roller pressing device to adjust the bending angle of the ninth bend structure 9; the bending angle of the ninth bend structure 9 is 200 degrees.

[0123] Step 9.2: The ninth bend structure 9 is bent by a roller pressing device to adjust the bending angle of the ninth bend structure 9; the bending angle of the ninth bend structure 9 is 170 degrees.

[0124] Step 9.3: The ninth bend structure 9 is bent by a roller pressing device to adjust the bending angle of the ninth bend structure 9; the bending angle of the ninth bend structure 9 is 180 degrees.

[0125] Step 9.4: Roller bend the ninth bend structure 9 using a roller press device, and adjust the bend angle of the ninth bend structure 9; the bend angle of the ninth bend structure 9 is 160 degrees; forming the seventh connecting arm 24 and the eighth connecting arm 25;

[0126] Step 9.5: Roller bend the ninth bend structure 9 using a roller pressing device, and adjust the bending angle of the ninth bend structure 9; the bending angle of the ninth bend structure 9 is 130 degrees.

[0127] Step 9.6: Roller bend the ninth bend structure 9 using a roller pressing device, and adjust the bending angle of the ninth bend structure 9; the bending angle of the ninth bend structure 9 is 110 degrees.

[0128] Step 9.7: Roller bend the ninth bend structure 9 using a roller press device, adjust the bend angle of the ninth bend structure 9 so that the second end 15 and the fourth end 17 abut together, and the bend angle of the ninth bend structure 9 is 90 degrees.

[0129] Step 10: Perform laser welding at the connection between the third end 16 and the fourth end 17 to form the third cavity 28.

[0130] The preparation method of this embodiment has the following advantages:

[0131] In terms of materials, high-strength steel with a strength of 600MPa and above is used to achieve material lightweighting;

[0132] In the prepared profile structure, after the steel strip is rolled through a forming mold, the two sides of the steel strip are bent to form a first cavity and a second cavity. Welding is performed at the joint where the materials are bonded, and the rolling and bending process continues to bring the first cavity and the second cavity together to form a third cavity. Welding is also performed at the joint of the cavities to ensure the integrity and stability of the material and structure. The overall bending and torsional strength and stiffness of the structure are significantly improved, and the performance advantage is very obvious compared to aluminum profiles. In the X and Y directions in space, the two adjacent sides at the joint of the first cavity and the second cavity are respectively set to form the reinforcing ribs in the structure, which improves the collision and energy absorption performance of the structure in both directions, and the weight is lighter than that of steel profile welding.

[0133] In terms of process flow, the offline welding process is eliminated, reducing equipment investment and manpower input, significantly lowering equipment investment, factory investment and processing costs, resulting in huge economic benefits.

[0134] Example 2:

[0135] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0136] like Figures 1-11 As shown, this embodiment provides a method for preparing a three-cavity roll-formed profile, including the following steps:

[0137] First pass: High-strength steel strip with a strength of 600MPa or above is used. In order to control the dimensions of the subsequent roll forming, a 21-roll leveling device is used to continuously level the steel strip. This is mainly used to remove the residual stress of the steel strip and keep the shape of the steel strip in the optimal state.

[0138] Second pass: The steel strip is rolled and bent on both sides simultaneously to form the first bend structure 1 and the second bend structure 2. The bend is mainly set at the corners of the left and right cavities, and is one of the two bends on the plane where the third cavity is attached and welded.

[0139] Passes 3-4: The first and second bend structures 1 and 2 on both sides are further bent, and the bend angle is increased, with the optimal angle being 45 degrees. At this point, the first and second bend structures 1 and 2 are completed.

[0140] The first bending structure 1 and the second bending structure 2 continue to be rolled and bent gradually in the 2nd, 3rd and 4th forming passes, with bending angles of 15 degrees → 30 degrees → 45 degrees in each pass.

[0141] Meanwhile, starting from the third pass, a third bend structure 3 and a fourth bend structure 4 are formed on the outer side of the steel strip. The bends create two flanges at the ends of the steel strip (i.e., the first end 14 and the second end 15). After being rolled and bent, these two flanges are attached to the steel strip to form the first cavity and the second cavity. Laser welding is performed at the contact plane to form the two cavities as a whole, ensuring the stability and strength of the structure.

[0142] Passes 4 and 5: The angles of the aforementioned third bend structure 3 and fourth bend structure 4 continue to increase gradually, and the final shape is completed in the sixth pass.

[0143] In the 3rd to 6th forming passes, the bending angles of the third bending structure 3 and the fourth bending structure 4 are 15 degrees → 45 degrees → 60 degrees → 90 degrees, respectively.

[0144] Passes 5, 6, and 7: Starting from pass 5, form the fifth bend structure 5 and the sixth bend structure 6, gradually increasing in size, and completing the process in pass 7.

[0145] In passes 5, 6, and 7, the bend angles of the fifth bend structure 5 and the sixth bend structure 6 are 15 degrees, 30 degrees, and 45 degrees, respectively.

[0146] In passes 8 through 11, the seventh bend structure 7 and the eighth bend structure 8 begin to be rolled and bent, gradually increasing in angle from 10 degrees to 25 degrees to 45 degrees to 70 degrees.

[0147] 12th pass: The eighth bend structure 8 is bent at a right angle of 90 degrees by 8 rollers, while the seventh bend structure 7 remains unchanged.

[0148] 13th pass: The seventh bend structure 7 is rolled and bent to a right angle of 90 degrees. At this time, the rolling forming and bending of the seventh bend structure 7 and the eighth bend structure 8 are completed, and both are formed into right angles.

[0149] 14th pass: Ninth bend structure 9, the steel strip starts from a parallel state, i.e., 180 degrees, and is then subjected to reverse roll bending (reverse bending), with a bend angle of 160 degrees.

[0150] 15th pass: The ninth bend structure 9 continues to be rolled, with a bend angle of 130 degrees. The tenth bend structure 10 and the eleventh bend structure 11 begin to be rolled. 15 passes, bend angle of 15 degrees.

[0151] 16th pass: The tenth bend structure 10 and the eleventh bend structure 11 continue to be rolled and bent, with the angle increasing to 25 degrees.

[0152] 17th pass: The eleventh bend structure 11 continues to be rolled and bent, with the angle increasing to 45 degrees. The ninth bend structure 9 and the tenth bend structure 10 remain unchanged.

[0153] 18th pass: The tenth bend structure 10 continues to be rolled and bent, with the angle increasing to 45 degrees. The ninth bend structure 9 and the eleventh bend structure 11 remain unchanged.

[0154] 19th pass: The eleventh bend structure 11 continues to be rolled and bent, with the angle increasing to 70 degrees. The ninth bend structure 9 and the tenth bend structure 10 remain unchanged.

[0155] 20th pass: The tenth bend structure 10 continues to be rolled and bent, with the angle increasing to 70 degrees. The ninth bend structure 9 and the eleventh bend structure 11 remain unchanged.

[0156] 21st pass: The tenth bend structure 10 and the eleventh bend structure 11 continue to be rolled and bent, with the angle increasing to 90 degrees, while the ninth bend structure 9 remains unchanged. At this time, the two flanges (i.e., the first end 14 and the second end 15) are attached to the steel strip, thus forming cavity 1 and cavity 2.

[0157] 22nd pass: Laser welding is performed on the flange (first end 14) of the first cavity to complete the sealing of the first cavity.

[0158] 23rd pass: Laser welding is performed on the flange (second end 15) of the second cavity to complete the sealing of the second cavity.

[0159] 24th pass: The ninth bend structure 9 continues to be rolled and bent at an angle of 160 degrees.

[0160] 25th pass: The ninth bend structure 9 continues to be rolled and bent at an angle of 170 degrees.

[0161] 26th pass: The ninth bend structure 9 continues to be rolled and bent at a 180-degree angle, and then flattened and shaped.

[0162] 27th pass: The ninth bend structure 9 continues to be rolled and bent, with a bend angle of 160 degrees.

[0163] 28th pass: The ninth bend structure 9 continues to be rolled and bent at an angle of 130 degrees.

[0164] 29th pass: The ninth bend structure 9 continues to be rolled and bent, with a bend angle of 110 degrees.

[0165] 30th pass: The ninth bend structure 9 continues to be rolled and bent at a 90-degree angle.

[0166] At this point, the two planes at the corners of the first and second cavities are fitted together, and laser welding is performed at the fitting point to complete the connection of the overall structure, ensuring the integrity and stability of the structure and meeting the strength and stiffness requirements.

[0167] This invention eliminates the need for subsequent welding processes, reducing personnel and equipment investment, and does not incur additional energy consumption during production, thus lowering costs.

[0168] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0169] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for preparing a three-cavity roll-formed profile, characterized in that, Includes the following steps: Step 1: Roller bends are performed on both ends of the steel strip simultaneously using a roller pressing device to form a first bend structure (1) and a second bend structure (2) at both ends of the steel strip. Step 2: The first bend structure (1) and the second bend structure (2) are rolled and bent by a roller pressing device to form a third bend structure (3) and a fourth bend structure (4) at both ends of the steel strip, forming a first connecting part (12), a second connecting part (13), a first end (14) and a second end (15); Step 3: The first bend structure (1), the second bend structure (2), the third bend structure (3), and the fourth bend structure (4) are rolled and bent by a roller pressing device to form the fifth bend structure (5) and the sixth bend structure (6) on the steel strip, forming the third end (16) and the fourth end (17). Step 4: Roller bend the third bend structure (3), the fourth bend structure (4), the fifth bend structure (5), and the sixth bend structure (6) by roller pressing device to form the seventh bend structure (7) and the eighth bend structure (8) on the steel strip, forming the first connecting arm (18) and the second connecting arm (19). Step 5: Roller bend the seventh bend structure (7) and the eighth bend structure (8); Step 6: The middle part of the steel strip is rolled and bent by the rolling device to form the ninth bend structure (9), and the tenth bend structure (10) and eleventh bend structure (11) are formed by rolling and bending on the steel strip to form the third connecting arm (20) and the fourth connecting arm (21). Step 7: Roller bend the tenth bend structure (10) and the eleventh bend structure (11) using a roller pressing device, so that the first end (14) abuts against the steel strip and the second end (15) abuts against the steel strip; forming the fifth connecting arm (22) and the sixth connecting arm (23); Step 8: Perform laser welding on the connection between the first end (14) and the fifth connecting arm (22), and the connection between the second end (15) and the sixth connecting arm (23); Step 9: The ninth bend structure (9) is rolled and bent by a roller pressing device so that the third end (16) and the fourth end (17) abut together; forming the seventh connecting arm (24) and the eighth connecting arm (25); Step 10: Perform laser welding at the connection between the third end (16) and the fourth end (17).

2. The method for preparing a three-cavity roll-formed profile according to claim 1, characterized in that, In step 1, the steel strip is leveled by a leveling device before it is rolled and bent.

3. The method for preparing a three-cavity roll-formed profile according to claim 1, characterized in that, Step 3 specifically involves: Step 3.1: Roller bend the first bend structure (1), the second bend structure (2), the third bend structure (3), and the fourth bend structure (4) using a roller pressing device, and adjust the bend angles of the first bend structure (1), the second bend structure (2), the third bend structure (3), and the fourth bend structure (4); Step 3.2: The first bend structure (1) and the second bend structure (2) are rolled and bent by a roller pressing device to form the fifth bend structure (5) and the sixth bend structure (6) on the steel strip, forming the third end (16) and the fourth end (17); At the same time, the third bend structure (3) and the fourth bend structure (4) are rolled and bent to adjust the bend angle of the third bend structure (3) and the fourth bend structure (4).

4. The method for preparing a three-cavity roll-formed profile according to claim 1, characterized in that, Step 4 specifically involves: Step 4.1: Roller bend the third bend structure (3), the fourth bend structure (4), the fifth bend structure (5), and the sixth bend structure (6) simultaneously using a roller pressing device, and adjust the bend angles of the third bend structure (3), the fourth bend structure (4), the fifth bend structure (5), and the sixth bend structure (6); the bend angles of the third bend structure (3) and the fourth bend structure (4) are 90 degrees, and the bend angles of the fifth bend structure (5) and the sixth bend structure (6) are 150 degrees. Step 4.2: Roller bend the fifth bend structure (5) and the sixth bend structure (6) using a roller pressing device, and adjust the bending angle of the fifth bend structure (5) and the sixth bend structure (6) to 135 degrees. Step 4.3: The fifth bend structure (5) and the sixth bend structure (6) are rolled and bent by a roller pressing device to form the seventh bend structure (7) and the eighth bend structure (8) on the steel strip, forming the first connecting arm (18) and the second connecting arm (19); the bending angle of the fifth bend structure (5) and the sixth bend structure (6) is 135 degrees, and the bending angle of the seventh bend structure (7) and the eighth bend structure (8) is 170 degrees.

5. The method for preparing a three-cavity roll-formed profile according to claim 1, characterized in that, Step 5 specifically involves: Step 5.1: Roller bend the seventh bend structure (7) and the eighth bend structure (8) and adjust the bend angle of the seventh bend structure (7) and the eighth bend structure (8); the bend angle of the seventh bend structure (7) and the eighth bend structure (8) is 155 degrees. Step 5.2: Roller bend the seventh bend structure (7) and the eighth bend structure (8) and adjust the bend angle of the seventh bend structure (7) and the eighth bend structure (8); the bend angle of the seventh bend structure (7) and the eighth bend structure (8) is 135 degrees. Step 5.3: Roller bend the seventh bend structure (7) and the eighth bend structure (8) and adjust the bend angle of the seventh bend structure (7) and the eighth bend structure (8); the bend angle of the seventh bend structure (7) and the eighth bend structure (8) is 110 degrees. Step 5.4: Roller bend the seventh corner structure (7) and adjust the bending angle of the seventh corner structure (7); the bending angle of the seventh corner structure (7) is 90 degrees; Step 5.5: Roller bend the eighth corner structure (8) and adjust the bending angle of the eighth corner structure (8); the bending angle of the eighth corner structure (8) is 90 degrees.

6. The method for preparing a three-cavity roll-formed profile according to claim 1, characterized in that, Step 6 specifically involves: Step 6.1: The middle part of the steel strip is rolled and bent by a roller pressing device to form the ninth bend structure (9); the bend angle of the ninth bend structure (9) is 200 degrees; Step 6.2: The ninth bend structure (9) is rolled and bent by a roller pressing device to form the tenth bend structure (10) and the eleventh bend structure (11) on the steel strip, forming the third connecting arm (20) and the fourth connecting arm (21), and adjusting the bend angle of the ninth bend structure (9); the bend angle of the ninth bend structure (9) is 230 degrees, and the bend angles of the tenth bend structure (10) and the eleventh bend structure (11) are 165 degrees.

7. The method for preparing a three-cavity roll-formed profile according to claim 1, characterized in that, Step 7 specifically involves: Step 7.1: Roller bend the tenth bend structure (10) and the eleventh bend structure (11) using a roller pressing device, and adjust the bending angle of the tenth bend structure (10) and the eleventh bend structure (11); the bending angle of the tenth bend structure (10) and the eleventh bend structure (11) is 155 degrees. Step 7.2: Roller bend the eleventh corner structure (11) using a roller pressing device to adjust the bending angle of the eleventh corner structure (11); the bending angle of the eleventh corner structure (11) is 135 degrees. Step 7.3: Roller bend the tenth bend structure (10) using a roller pressing device to adjust the bend angle of the tenth bend structure (10); the bend angle of the tenth bend structure (10) is 135 degrees. Step 7.4: Roller bend the eleventh bend structure (11) using a roller pressing device to adjust the bend angle of the eleventh bend structure (11); the bend angle of the eleventh bend structure (11) is 110 degrees. Step 7.5: Roller bend the tenth bend structure (10) using a roller pressing device to adjust the bend angle of the tenth bend structure (10); the bend angle of the tenth bend structure (10) is 110 degrees. Step 7.6: Roller bend the tenth bend structure (10) and the eleventh bend structure (11) using a roller pressing device, and adjust the bending angles of the tenth bend structure (10) and the eleventh bend structure (11); make the first end (14) abut against the steel strip, and make the second end (15) abut against the steel strip to form the fifth connecting arm (22) and the sixth connecting arm (23); the bending angle of the tenth bend structure (10) is 90 degrees, and the bending angle of the eleventh bend structure (11) is 90 degrees.

8. The method for preparing a three-cavity roll-formed profile according to claim 1, characterized in that, Step 9 specifically involves: Step 9.1: The ninth bend structure (9) is reverse-bending and rolled by a roller pressing device to adjust the bending angle of the ninth bend structure (9); the bending angle of the ninth bend structure (9) is 200 degrees. Step 9.2: The ninth bend structure (9) is bent by a roller pressing device to adjust the bending angle of the ninth bend structure (9); the bending angle of the ninth bend structure (9) is 170 degrees. Step 9.3: The ninth bend structure (9) is bent by a roller pressing device to adjust the bending angle of the ninth bend structure (9); the bending angle of the ninth bend structure (9) is 180 degrees. Step 9.4: Roller bend the ninth bend structure (9) using a roller press device to adjust the bend angle of the ninth bend structure (9); the bend angle of the ninth bend structure (9) is 160 degrees; forming the seventh connecting arm (24) and the eighth connecting arm (25); Step 9.5: Roller bend the ninth bend structure (9) using a roller press device to adjust the bend angle of the ninth bend structure (9); the bend angle of the ninth bend structure (9) is 130 degrees. Step 9.6: Roller bend the ninth bend structure (9) using a roller press device to adjust the bend angle of the ninth bend structure (9); the bend angle of the ninth bend structure (9) is 110 degrees. Step 9.7: Roller bend the ninth corner structure (9) using a roller press device, adjust the bending angle of the ninth corner structure (9) so that the second end (15) and the fourth end (17) abut together, and the bending angle of the ninth corner structure (9) is 90 degrees.

9. The method for preparing a three-cavity roll-formed profile according to claim 3, characterized in that, In step 1, the bending angle of the first bend structure (1) and the second bend structure (2) is 165 degrees. In step 2, the bending angles of the first bend structure (1) and the second bend structure (2) are 150 degrees; the bending angles of the third bend structure (3) and the fourth bend structure (4) are 165 degrees. In step 3.1, the bending angle of the first bend structure (1) and the second bend structure (2) is 135 degrees; the bending angle of the third bend structure (3) and the fourth bend structure (4) is 150 degrees. In step 3.2, the bending angle of the third bend structure (3) and the fourth bend structure (4) is 120 degrees.

10. The method for preparing a three-cavity roll-formed profile according to claim 2, characterized in that, In step 1, the steel strip has a strength of 600 MPa or higher, and a 21-roll leveling device is used to continuously level the steel strip.

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