Preparation method of roll-formed frame and roll-formed frame

Abstract

The present invention provides a method for preparing a roll-forming frame and a roll-forming frame, comprising the following steps: forming a first vertical wall and a first transverse wall connected to each other at opposite ends of a plate to be processed; roll-bending the first transverse wall to form a stepped bending structure; roll-bending the first transverse wall to form a second vertical wall, and second and third transverse walls; roll-bending the second transverse wall to form a third vertical wall and a fourth transverse wall; roll-bending the third transverse wall to form a fourth vertical wall and a fifth transverse wall; laser welding the connection between the fourth vertical wall and the first vertical wall; roll-bending the end of the fifth transverse wall away from the fourth vertical wall to form a connecting edge and a sixth transverse wall; roll-bending the sixth transverse wall to form a fifth vertical wall and a seventh transverse wall; and laser welding the connection between the connecting edge and the second vertical wall. The present invention utilizes an advanced roll-forming process for in-line integrated forming, resulting in high product quality, stable production, and high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of roll-formed profiles, and in particular to a preparation method of a roll-formed frame and the roll-formed frame. Background Art

[0002] The existing battery pack frame's main structural processing method involves welding the left and right longitudinal beams and the front and rear crossbeams (four parts) around the joints to form a prefabricated frame. The prefabricated frame is then welded to the bottom steel plate to form a battery pack tray. This processing method has the following drawbacks: a) a wide variety of materials, with five types being used; b) a long processing flow with low production efficiency, including rolling the frame material, welding it, welding the frame, welding the steel plate and frame together, and then laser cutting the holes; c) high quality control and welding difficulties, as post-welding deformation and low dimensional accuracy require subsequent laser cutting to ensure accurate rivet hole installation; and d) high equipment investment, processing, and labor costs. Summary of the Invention

[0003] In view of the defects in the prior art, the object of the present invention is to provide a preparation method of a roll-formed frame and a roll-formed frame.

[0004] A method for preparing a roll-formed frame according to the present invention comprises the following steps:

[0005] Step 1: Roll-bending the opposite ends of the plate to be processed to form a first vertical wall and a first horizontal wall connected to each other at the opposite ends of the plate to be processed, and forming a bottom plate between the two first vertical walls;

[0006] Step 2: Roll-bending one end of the first transverse wall close to the first vertical wall to form a step-bent structure;

[0007] Step 3: Roll-bending the first transverse wall to form a second vertical wall, a second transverse wall, and a third transverse wall connected to each other;

[0008] Step 4: Roll-bending the second transverse wall to form a third vertical wall and a fourth transverse wall connected thereto; Roll-bending the third transverse wall to form a fourth vertical wall and a fifth transverse wall connected thereto; the fourth vertical wall abuts against the first vertical wall structure;

[0009] Step 5: Laser welding the connection between the fourth vertical wall and the first vertical wall, so that the second vertical wall, the third vertical wall, the fourth horizontal wall and the first vertical wall form a first cavity and a second cavity;

[0010] Step 6: Roll-bending the end of the fifth transverse wall away from the fourth vertical wall to form a connecting edge and a sixth transverse wall;

[0011] Step 7: Roll-bending the sixth transverse wall to form a fifth vertical wall and a seventh transverse wall connected to each other; the connecting edge abuts against the second vertical wall;

[0012] Step 8: Laser welding is performed on the connection between the connecting edge and the second vertical wall, and the fourth vertical wall, the fifth vertical wall, the seventh transverse wall and the second vertical wall form a third cavity and a fourth cavity.

[0013] Preferably, in step 1, a first angle structure is formed between the first vertical wall and the bottom plate structure, and a second angle structure is formed between the first horizontal wall and the first vertical wall;

[0014] In step 2, a third corner structure and a fourth corner structure are formed in the step-bending structure;

[0015] In step 3, the two ends of the second transverse wall are respectively connected to the step-bending structure and the second vertical wall, a fifth angle structure is formed between the second transverse wall and the second vertical wall, and a sixth angle structure is formed between the second vertical wall and the third transverse wall;

[0016] In step 4, a seventh angle structure is formed between the third vertical wall and the fourth horizontal wall, and two ends of the fourth horizontal wall are respectively connected to the step-bending structure and the third vertical wall;

[0017] An eighth angle structure is formed between the fourth vertical wall and the fifth transverse wall, and two ends of the fourth vertical wall are connected to the fifth transverse wall and the second vertical wall respectively;

[0018] In step 6, a ninth corner structure is formed between the connecting edge and the sixth transverse wall;

[0019] In step 7, a tenth angle structure is formed between the fifth vertical wall and the seventh transverse wall, and two ends of the fifth vertical wall are respectively connected to the connecting edge and the seventh transverse wall.

[0020] Preferably, the step 1 specifically includes the following steps:

[0021] Step 1.1: Roll-bending opposite ends of the plate to be processed to form first side structures and second side structures at the opposite ends of the plate to be processed, respectively. The bottom plate is formed between the first side structure and the second side structure. First corner structures are formed between the first side structure and the bottom plate structure, and between the second side structure and the bottom plate.

[0022] Step 1.2: Roll-bending the first side structure and the second side structure to form the first vertical wall and the first transverse wall, with a second corner structure formed between the first vertical wall and the first transverse wall;

[0023] Step 1.3: Roll-bend the first vertical wall and the first transverse wall multiple times, gradually reduce the angle of the first corner structure to form the first bent corner structure, and gradually reduce the angle of the second corner structure to form the second bent corner structure.

[0024] Preferably, in step 1.1, the first angle structure is 177°;

[0025] In step 1.2, the first angle structure is 170°, and the second angle structure is 172°;

[0026] The step 1.3 specifically includes the following steps:

[0027] Step 1.3.1: Roll-bending the first vertical wall and the first transverse wall so that the first angle structure is 160° and the second angle structure is 162°;

[0028] Step 1.3.2: Roll-bending the first vertical wall and the first transverse wall so that the first angle structure is 145° and the second angle structure is 148°;

[0029] Step 1.3.3: Roll-bending the first vertical wall and the first transverse wall so that the first angle structure is 130° and the second angle structure is 132°;

[0030] Step 1.3.4: Roll-bending the first vertical wall and the first transverse wall so that the first angle structure is 115° and the second angle structure is 118°;

[0031] Step 1.3.5: Roll-bending the first vertical wall and the first transverse wall so that the first angle structure is 100° and the second angle structure is 103°;

[0032] Step 1.3.6: Roll-bending the first vertical wall and the first transverse wall so that the first angle structure is 90°, forming the first curved angle structure, and the second angle structure is 93°;

[0033] Step 1.3.7: Roll-bend the first transverse wall so that the second angle structure is 90°, thereby forming the second angle structure.

[0034] Preferably, the step 2 specifically includes the following steps:

[0035] Step 2.1: Roll-bending one end of the first transverse wall close to the first vertical wall to form a stepped planar structure and a third side structure, wherein a third corner structure is formed between the stepped planar structure and the third side structure;

[0036] Step 2.2: Roll-bending the third side structure to form a stepped inclined surface structure and a fourth side structure, wherein the third corner structure is formed between the stepped plane structure and the stepped inclined surface structure, and the fourth corner structure is formed between the stepped inclined surface structure and the fourth side structure;

[0037] Step 2.3: Roll-bend the fourth side structure and the step slope structure multiple times, gradually increase the angle of the third corner structure to form the third bent corner structure, and gradually increase the angle of the fourth corner structure to form the fourth bent corner structure.

[0038] Preferably, in step 2.1, the third angle structure is 3°;

[0039] In step 2.2, the third angle structure is 15°, and the fourth angle structure is 13°;

[0040] The step 2.3 specifically includes the following steps:

[0041] Step 2.3.1: Roll-bending the fourth side structure and the step slope structure so that the third angle structure is 30° and the fourth angle structure is 28°;

[0042] Step 2.3.2: Roll-bending the fourth side structure and the step slope structure so that the third angle structure is 45° and the fourth angle structure is 42°;

[0043] Step 2.3.3: Roll-bending the fourth side structure and the step slope structure so that the third angle structure is 54°, forming the third curved angle structure, and the fourth angle structure is 52°;

[0044] Step 2.3.4: Roll-bend the fourth side structure so that the fourth angle structure is 54°, thereby forming the fourth angle structure.

[0045] Preferably, the step 3 specifically includes the following steps:

[0046] Step 3.1: Roll-bending the first transverse wall to form the second transverse wall and the fifth side structure, wherein a fifth corner structure is formed between the second transverse wall and the fifth side structure;

[0047] Step 3.2: Roll-bending the fifth side structure to form the second vertical wall and the third transverse wall, wherein the fifth corner structure is formed between the second transverse wall and the second vertical wall, and the sixth corner structure is formed between the second vertical wall and the third transverse wall;

[0048] Step 3.3: Roll-bend the second vertical wall and the third transverse wall multiple times, gradually reduce the angle of the fifth corner structure to form the fifth bent corner structure, and gradually reduce the angle of the sixth corner structure to form the sixth bent corner structure.

[0049] Preferably, in step 3.1, the fifth angle structure is 176°;

[0050] In step 3.2, the fifth angle structure is 165°, and the sixth angle structure is 170°;

[0051] The step 3.3 specifically includes the following steps:

[0052] Step 3.3.1: Roll-bending the second vertical wall and the third transverse wall so that the fifth angle is 150° and the sixth angle is 155°;

[0053] Step 3.3.2: Roll-bending the second vertical wall and the third transverse wall so that the fifth angle is 135° and the sixth angle is 140°;

[0054] Step 3.3.3: Roll-bending the second vertical wall and the third transverse wall so that the fifth angle structure is 120° and the sixth angle structure is 125°;

[0055] Step 3.3.4: Roll-bending the second vertical wall and the third transverse wall so that the fifth angle structure is 105° and the sixth angle structure is 110°;

[0056] Step 3.3.5: Roll-bending the second vertical wall and the third transverse wall so that the fifth angle structure is 90°, forming the fifth bent angle structure, and the sixth angle structure is 95°;

[0057] Step 3.3.6: Roll-bend the third transverse wall so that the sixth angle structure is 90°, thereby forming the sixth bent angle structure.

[0058] Preferably, step 4 specifically includes the following steps:

[0059] Step 4.1: Roll-bending the second transverse wall to form the third vertical wall and the fourth transverse wall, with a seventh corner structure formed between the third vertical wall and the fourth transverse wall;

[0060] Step 4.2: Roll-bending the third vertical wall and reducing the first angle of the seventh corner structure;

[0061] Step 4.3: Rolling the third transverse wall to form the fourth vertical wall and the fifth transverse wall, with the eighth angle structure formed between the fourth vertical wall and the fifth transverse wall; rolling and bending the third vertical wall to perform a second angle reduction adjustment on the seventh angle structure;

[0062] Step 4.4: Roll-bend the fifth transverse wall and the third vertical wall multiple times, gradually reduce the angle of the seventh corner structure to form the seventh bent corner structure, and gradually reduce the angle of the eighth corner structure to form the eighth bent corner structure.

[0063] Preferably, in step 4.1, the seventh angle structure is formed at 175°;

[0064] In step 4.2, the seventh angle structure is 170°;

[0065] In step 4.3, the seventh angle structure is 160°, and the eighth angle structure is 170°;

[0066] The step 4.4 specifically includes the following steps:

[0067] Step 4.4.1: Roll-bending the fifth transverse wall and the third vertical wall so that the seventh angle structure is 150° and the eighth angle structure is 160°;

[0068] Step 4.4.2: Roll-bending the fifth transverse wall and the third vertical wall so that the seventh angle structure is 140° and the eighth angle structure is 150°;

[0069] Step 4.4.3: Roll-bending the fifth transverse wall and the third vertical wall so that the seventh angle structure is 130° and the eighth angle structure is 140°;

[0070] Step 4.4.4: Roll-bending the fifth transverse wall and the third vertical wall so that the seventh angle structure is 120° and the eighth angle structure is 130°;

[0071] Step 4.4.5: Roll-bending the fifth transverse wall and the third vertical wall so that the seventh angle structure is 110° and the eighth angle structure is 120°;

[0072] Step 4.4.6: Roll-bending the fifth transverse wall and the third vertical wall so that the seventh angle is 100° and the eighth angle is 110°;

[0073] Step 4.4.7: Roll-bending the fifth transverse wall and the third vertical wall so that the seventh angle structure is 90°, forming the seventh bent angle structure, and the eighth angle structure is 100°;

[0074] Step 4.4.8: Roll-bend the fifth transverse wall so that the eighth angle structure is 90°, thereby forming the eighth angle structure.

[0075] Preferably, step 6 specifically includes the following steps:

[0076] Step 6.1: Roll-bending the end of the fifth transverse wall away from the fourth vertical wall to form the connecting edge and the sixth transverse wall, with a ninth corner structure formed between the connecting edge and the sixth transverse wall;

[0077] Step 6.2: Roll-bending the connecting edge multiple times to gradually reduce the angle of the ninth corner structure to form the ninth corner structure.

[0078] Preferably, in step 6.1, the ninth angle structure is 180°;

[0079] The step 6.2 specifically includes the following steps:

[0080] Step 6.2.1: Roll-bending the connecting edge so that the ninth angle structure is 150°;

[0081] Step 6.2.2: Roll-bending the connecting edge so that the ninth angle structure is 120°;

[0082] Step 6.2.3: Roll-bend the connecting edge to make the ninth angle structure 90°, thereby forming the ninth angle structure.

[0083] Preferably, the step 7 specifically includes the following steps:

[0084] Step 7.1: Roll-bending the sixth transverse wall to form the fifth vertical wall and the seventh transverse wall, with a tenth corner structure formed between the fifth vertical wall and the seventh transverse wall;

[0085] Step 7.2: Roll-bending the fifth vertical wall multiple times to gradually reduce the angle of the tenth corner structure to form the tenth bent corner structure.

[0086] Preferably, in step 7.1, the tenth angle structure is 163°;

[0087] The step 7.2 specifically includes the following steps:

[0088] Step 7.2.1: Roll-bending the fifth vertical wall so that the tenth angle structure is 145°;

[0089] Step 7.2.2: Roll-bending the fifth vertical wall so that the tenth angle structure is 130°;

[0090] Step 7.2.3: Roll-bending the fifth vertical wall so that the tenth angle structure is 115°;

[0091] Step 7.2.4: Roll-bending the fifth vertical wall so that the tenth angle structure is 100°;

[0092] Step 7.2.5: Roll-bend the fifth vertical wall so that the tenth angle structure is 90°, thereby forming the tenth bent angle structure.

[0093] Preferably, in step 8, a left longitudinal beam portion and a right longitudinal beam portion are formed at opposite ends of the bottom plate;

[0094] The method for preparing the roll-formed frame further comprises the following steps:

[0095] Step 9: Cut the left longitudinal beam portion and the right longitudinal beam portion located at the four corners of the bottom plate, and form a front longitudinal beam plate and a rear longitudinal beam plate at the other opposite ends of the bottom plate;

[0096] Step 10: Bending the front longitudinal beam plate and the rear longitudinal beam plate to form a sixth vertical wall and an eighth transverse wall, and forming an eleventh angle structure between the sixth vertical wall and the eighth transverse wall;

[0097] Step 11: bending the eighth transverse wall to form a seventh vertical wall and a ninth transverse wall, and forming a twelfth angle structure between the seventh vertical wall and the ninth transverse wall;

[0098] Step 12: Bending the seventh vertical wall to form an eighth vertical wall and a tenth transverse wall, and forming a thirteenth angle structure between the eighth vertical wall and the tenth transverse wall;

[0099] Step 13: Bending the ninth transverse wall so that the sixth vertical wall abuts against the bottom plate, forming a fourteenth angle structure between the ninth transverse wall and the bottom plate, and forming a front longitudinal beam portion and a rear longitudinal beam portion at the other opposite ends of the bottom plate;

[0100] Step 14: Weld the connection between the front longitudinal beam and the left longitudinal beam, weld the connection between the front longitudinal beam and the right longitudinal beam, weld the connection between the rear longitudinal beam and the left longitudinal beam, weld the connection between the rear longitudinal beam and the right longitudinal beam, and weld the connection between the sixth vertical wall and the bottom plate.

[0101] The present invention also provides a roll-formed frame, which is prepared by using the above-mentioned method for preparing the roll-formed frame.

[0102] Preferably, it comprises a bottom plate, a left longitudinal beam portion and a right longitudinal beam portion; the left longitudinal beam portion and the right longitudinal beam portion are respectively arranged at opposite ends of the bottom plate;

[0103] The left longitudinal beam portion and the right longitudinal beam portion each include the first vertical wall, the fourth transverse wall, the third vertical wall, the second vertical wall, the fourth vertical wall, the seventh transverse wall, the fifth vertical wall, and the connecting edge, which are connected in sequence;

[0104] The fourth transverse wall, the third vertical wall and the second vertical wall constitute a first notch structure, and the second vertical wall, the fourth vertical wall and the seventh transverse wall constitute a second notch structure;

[0105] The first vertical wall is connected to the open end of the first notch structure, and the fourth vertical wall is connected to the first vertical wall;

[0106] The fifth vertical wall is connected to the opening end of the second recess structure, and the connecting edge is connected to an end of the second vertical wall close to the third vertical wall.

[0107] Compared with the prior art, the present invention has the following beneficial effects:

[0108] 1. In the preparation method of the present invention, high-strength steel is selected and an advanced roll forming process is adopted for online integrated forming, which results in good product quality, high production stability and high efficiency;

[0109] 2. The preparation method of the present invention does not require subsequent steel plate welding and laser hole cutting processing steps, which reduces the investment in personnel and equipment, does not increase additional energy consumption during production, and reduces costs;

[0110] 3. The preparation method of the present invention reduces the number of materials from five to one, thereby reducing the number of materials and reducing the procurement cycle and cost;

[0111] 4. The profile structure prepared by the present invention has the following structure: the longitudinal beams around the frame are roll-formed at one time, the front and rear beams are bent and formed, and then the frame is welded. The base plate and the frame are formed in one piece, which reduces the welding process and welding amount, and has higher forming accuracy. The integrity of the frame ensures the overall strength and rigidity of the structure, and improves the anti-collision performance of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0112] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0113] Figure 1is a flow chart of the steps of the method for preparing a roll-formed frame of the present invention;

[0114] Figure 2 Schematic diagram of the 1st to 9th forming steps of a method for preparing a roll-formed frame in one embodiment;

[0115] Figures 3-5 Schematic diagram of the angles of the 1st to 9th forming passes;

[0116] Figure 6 Schematic diagram of the 10th to 15th forming steps of a method for preparing a roll-formed frame in one embodiment;

[0117] Figures 7-9 This is a schematic diagram of the angles of the 10th to 15th forming passes;

[0118] Figure 10 Schematic diagram of the 16th to 23rd forming steps of a method for preparing a roll-formed frame in one embodiment;

[0119] Figures 11-13 This is a schematic diagram of the angles of the 16th to 23rd forming passes;

[0120] Figure 14 Schematic diagram of the 24th to 34th forming steps of the preparation method of the roll-formed frame in one embodiment;

[0121] Figures 15-18 This is a schematic diagram of the angles of the 24th to 34th forming passes;

[0122] Figure 19 Schematic diagram of welding during the 35th forming step of a method for preparing a roll-formed frame in one embodiment;

[0123] Figure 20 Schematic diagram of the 36th to 39th forming steps of the preparation method of the roll-formed frame in one embodiment;

[0124] Figures 21-22 This is a schematic diagram of the angles of the 36th to 39th forming passes;

[0125] Figure 23 Schematic diagram of the 40th to 45th forming steps of a method for preparing a roll-formed frame in one embodiment;

[0126] Figures 24-25 This is a schematic diagram of the angles of the 40th to 45th forming passes;

[0127] Figure 26 Schematic diagram of the structure of each corner structure;

[0128] Figure 27 Schematic diagram of welding during the 46th forming step of a method for preparing a roll-formed frame in one embodiment;

[0129] Figure 28 Schematic diagram of the 47th to 48th forming steps of the roll-formed frame preparation method in one embodiment;

[0130] Figure 29 Schematic diagram of the structure of a roll-formed frame obtained by a method for preparing a roll-formed frame in one embodiment;

[0131] Figure 30 is a front view of a roll-formed frame obtained by a method for preparing a roll-formed frame in one embodiment;

[0132] Figures 31-35 1 is a structural diagram of a roll-formed frame in steps 9 to 14 of a method for preparing a roll-formed frame in one embodiment.

[0133] The figure shows:

[0134] First vertical wall 1 Step plane structure 22 Ninth horizontal wall 43

[0135] First transverse wall 2 Third side structure 23 Twelfth corner structure 44

[0136] Bottom plate 3 Step slope structure 24 Eighth vertical wall 45

[0137] Step bending structure 4 Fourth side structure 25 Tenth transverse wall 46

[0138] Second vertical wall 5 Fifth side structure 26 Thirteenth corner structure 47

[0139] Second transverse wall 6 First corner structure 27 Fourteenth corner structure 48

[0140] Third transverse wall 7 Second corner structure 28 Left transverse beam 49

[0141] Third vertical wall 8 Third corner structure 29 Right crossbeam 50

[0142] Fourth transverse wall 9 Fourth corner structure 30 Front cross beam 51

[0143] Fourth vertical wall 10 Fifth corner structure 31 Rear cross beam 52

[0144] Fifth transverse wall 11 Sixth corner structure 32 First corner structure 53

[0145] First cavity 12 Seventh corner structure 33 Second corner structure 54

[0146] Second cavity 13 Eighth corner structure 34 Third corner structure 55

[0147] Connecting edge 14 Ninth corner structure 35 Fourth corner structure 56

[0148] Sixth transverse wall 15 Tenth corner structure 36 Fifth corner structure 57

[0149] Fifth vertical wall 16 Front cross beam 37 Sixth corner structure 58

[0150] Seventh transverse wall 17, rear transverse beam plate 38, seventh corner structure 59

[0151] Third cavity 18 Sixth vertical wall 39 Eighth corner structure 60

[0152] Fourth cavity 19 Eighth transverse wall 40 Ninth corner structure 61

[0153] First side structure 20 Eleventh corner structure 41 Tenth corner structure 62

[0154] Second side structure 21 Seventh vertical wall 42 DETAILED DESCRIPTION

[0155] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0156] Example 1:

[0157] like Figures 1 to 35 As shown, this embodiment provides a method for preparing a roll-formed frame, comprising the following steps:

[0158] Step 1: Roll-bending the opposite ends of the plate to be processed to form a first vertical wall 1 and a first transverse wall 2 connected to each other at the opposite ends of the plate to be processed, and forming a bottom plate 3 between the two first vertical walls 1; forming a first angle structure 27 between the first vertical wall 1 and the bottom plate 3, and forming a second angle structure 28 between the first transverse wall 2 and the first vertical wall 1; Step 1 specifically includes the following steps:

[0159] Step 1.1: Roll-bending the opposite ends of the plate to be processed to form first side structures 20 and second side structures 21 at the opposite ends of the plate to be processed, respectively. A bottom plate 3 is formed between the first side structure 20 and the second side structure 21. First corner structures 53 are formed between the first side structure 20 and the bottom plate 3 and between the second side structure 21 and the bottom plate 3.

[0160] Step 1.2: Roll-bending the first side structure 20 and the second side structure 21 to form a first vertical wall 1 and a first transverse wall 2, with a second corner structure 54 formed between the first vertical wall 1 and the first transverse wall 2;

[0161] Step 1.3: Roll-bending the first vertical wall 1 and the first transverse wall 2 multiple times to gradually reduce the angle of the first corner structure 53 to form a first bent corner structure 27 , and gradually reduce the angle of the second corner structure 54 to form a second bent corner structure 28 ;

[0162] In step 1.1, the first angle structure 53 is 177°;

[0163] In step 1.2, the first angle structure 53 is 170° and the second angle structure 54 is 172°;

[0164] Step 1.3 specifically includes the following steps:

[0165] Step 1.3.1: Roll-bend the first vertical wall 1 and the first transverse wall 2 so that the first angle structure 53 is 160° and the second angle structure 54 is 162°;

[0166] Step 1.3.2: Roll-bend the first vertical wall 1 and the first transverse wall 2 so that the first angle structure 53 is 145° and the second angle structure 54 is 148°;

[0167] Step 1.3.3: Roll-bend the first vertical wall 1 and the first transverse wall 2 so that the first angle structure 53 is 130° and the second angle structure 54 is 132°;

[0168] Step 1.3.4: Roll-bend the first vertical wall 1 and the first transverse wall 2 so that the first angle structure 53 is 115° and the second angle structure 54 is 118°;

[0169] Step 1.3.5: Roll-bend the first vertical wall 1 and the first transverse wall 2 so that the first angle structure 53 is 100° and the second angle structure 54 is 103°;

[0170] Step 1.3.6: Roll-bend the first vertical wall 1 and the first transverse wall 2 so that the first angle structure 53 is 90°, forming the first angle structure 27, and the second angle structure 54 is 93°;

[0171] Step 1.3.7: Roll-bend the first transverse wall 2 so that the second angle structure 54 is 90°, thereby forming a second angle structure 28.

[0172] Step 2: Roll-bend the end of the first transverse wall 2 close to the first vertical wall 1 to form a step-bending structure 4; a third corner structure 29 and a fourth corner structure 30 are formed in the step-bending structure 4. Step 2 specifically includes the following steps:

[0173] Step 2.1: Roll-bend one end of the first transverse wall 2 close to the first vertical wall 1 to form a stepped planar structure 22 and a third side structure 23 , with a third corner structure 55 formed between the stepped planar structure 22 and the third side structure 23 ;

[0174] Step 2.2: Roll-bending the third side structure 23 to form a stepped inclined surface structure 24 and a fourth side structure 25 . A third corner structure 55 is formed between the stepped planar structure 22 and the stepped inclined surface structure 24 . A fourth corner structure 56 is formed between the stepped inclined surface structure 24 and the fourth side structure 25 .

[0175] Step 2.3: Roll-bending the fourth side structure 25 and the stepped slope structure 24 multiple times, gradually increasing the angle of the third corner structure 55 to form a third bent corner structure 29, and gradually increasing the angle of the fourth corner structure 56 to form a fourth bent corner structure 30;

[0176] In step 2.1, the third angle structure 55 is 3°;

[0177] In step 2.2, the third angle structure 55 is 15° and the fourth angle structure 56 is 13°;

[0178] Step 2.3 specifically includes the following steps:

[0179] Step 2.3.1: Roll-bend the fourth side structure 25 and the step slope structure 24 so that the third angle structure 55 is 30 degrees and the fourth angle structure 56 is 28 degrees;

[0180] Step 2.3.2: Roll-bend the fourth side structure 25 and the step slope structure 24 so that the third angle structure 55 is 45 degrees and the fourth angle structure 56 is 42 degrees;

[0181] Step 2.3.3: Roll-bend the fourth side structure 25 and the step slope structure 24 to make the third angle structure 55 54 degrees, forming the third angle structure 29, and make the fourth angle structure 56 52 degrees;

[0182] Step 2.3.4: Roll-bend the fourth side structure 25 so that the fourth corner structure 56 is 54°, thereby forming a fourth corner structure 30.

[0183] Step 3: Roll-bend the first transverse wall 2 to form a connected second vertical wall 5, a second transverse wall 6, and a third transverse wall 7; the two ends of the second transverse wall 6 are respectively connected to the step-bending structure 4 and the second vertical wall 5, forming a fifth corner structure 31 between the second transverse wall 6 and the second vertical wall 5, and forming a sixth corner structure 32 between the second vertical wall 5 and the third transverse wall 7. Step 3 specifically includes the following steps:

[0184] Step 3.1: Roll-bending the first transverse wall 2 to form a second transverse wall 6 and a fifth side structure 26 , and forming a fifth corner structure 57 between the second transverse wall 6 and the fifth side structure 26 ;

[0185] Step 3.2: Roll-bending the fifth side structure 26 to form a second vertical wall 5 and a third transverse wall 7 , a fifth corner structure 57 between the second transverse wall 6 and the second vertical wall 5 , and a sixth corner structure 58 between the second vertical wall 5 and the third transverse wall 7 ;

[0186] Step 3.3: Roll-bend the second vertical wall 5 and the third transverse wall 7 multiple times to gradually reduce the angle of the fifth corner structure 57 to form the fifth corner structure 31 , and gradually reduce the angle of the sixth corner structure 58 to form the sixth corner structure 32 ;

[0187] In step 3.1, the fifth angle structure 57 is 176°;

[0188] In step 3.2, the fifth angle structure 57 is 165° and the sixth angle structure 58 is 170°;

[0189] Step 3.3 specifically includes the following steps:

[0190] Step 3.3.1: Roll-bend the second vertical wall 5 and the third transverse wall 7 so that the fifth angle 57 is 150° and the sixth angle 58 is 155°;

[0191] Step 3.3.2: Roll-bend the second vertical wall 5 and the third transverse wall 7 so that the fifth angle structure 57 is 135° and the sixth angle structure 58 is 140°;

[0192] Step 3.3.3: Roll-bend the second vertical wall 5 and the third transverse wall 7 so that the fifth angle structure 57 is 120° and the sixth angle structure 58 is 125°;

[0193] Step 3.3.4: Roll-bend the second vertical wall 5 and the third transverse wall 7 so that the fifth angle structure 57 is 105° and the sixth angle structure 58 is 110°;

[0194] Step 3.3.5: Roll-bend the second vertical wall 5 and the third transverse wall 7 so that the fifth angle structure 57 is 90°, forming the fifth angle structure 31, and the sixth angle structure 58 is 95°;

[0195] Step 3.3.6: Roll-bend the third transverse wall 7 so that the sixth angle structure 58 is 90°, thereby forming a sixth angle structure 32.

[0196] Step 4: Roll-bend the second transverse wall 6 to form a connected third vertical wall 8 and a fourth transverse wall 9; roll-bend the third transverse wall 7 to form a connected fourth vertical wall 10 and a fifth transverse wall 11; the fourth vertical wall 10 abuts against the first vertical wall 1 structure; a seventh angle structure 33 is formed between the third vertical wall 8 and the fourth transverse wall 9, and the two ends of the fourth transverse wall 9 are respectively connected to the step-bending structure 4 and the third vertical wall 8; an eighth angle structure 34 is formed between the fourth vertical wall 10 and the fifth transverse wall 11, and the two ends of the fourth vertical wall 10 are respectively connected to the fifth transverse wall 11 and the second vertical wall 5; Step 4 specifically includes the following steps:

[0197] Step 4.1: Roll-bending the second transverse wall 6 to form a third vertical wall 8 and a fourth transverse wall 9 , with a seventh corner structure 59 formed between the third vertical wall 8 and the fourth transverse wall 9 ;

[0198] Step 4.2: Roll-bend the third vertical wall 8 and adjust the seventh corner structure 59 to reduce the first angle;

[0199] Step 4.3: Roll the third transverse wall 7 to form the fourth vertical wall 10 and the fifth transverse wall 11, and form the eighth corner structure 60 between the fourth vertical wall 10 and the fifth transverse wall 11; roll-bend the third vertical wall 8 to perform a second angle reduction adjustment on the seventh corner structure 59;

[0200] Step 4.4: Roll-bending the fifth transverse wall 11 and the third vertical wall 8 multiple times to gradually reduce the angle of the seventh corner structure 59 to form the seventh corner structure 33 , and gradually reduce the angle of the eighth corner structure 60 to form the eighth corner structure 34 ;

[0201] In step 4.1, the seventh angle structure 59 is formed at 175°;

[0202] In step 4.2, the seventh angle structure 59 is 170°;

[0203] In step 4.3, the seventh angle structure 59 is 160°, and the eighth angle structure 60 is 170°;

[0204] Step 4.4 specifically includes the following steps:

[0205] Step 4.4.1: Roll-bend the fifth transverse wall 11 and the third vertical wall 8 so that the seventh angle structure 59 is 150° and the eighth angle structure 60 is 160°;

[0206] Step 4.4.2: Roll-bend the fifth transverse wall 11 and the third vertical wall 8 so that the seventh angle structure 59 is 140° and the eighth angle structure 60 is 150°;

[0207] Step 4.4.3: Roll-bend the fifth transverse wall 11 and the third vertical wall 8 so that the seventh angle structure 59 is 130° and the eighth angle structure 60 is 140°;

[0208] Step 4.4.4: Roll-bend the fifth transverse wall 11 and the third vertical wall 8 so that the seventh angle structure 59 is 120° and the eighth angle structure 60 is 130°;

[0209] Step 4.4.5: Roll-bend the fifth transverse wall 11 and the third vertical wall 8 so that the seventh angle structure 59 is 110° and the eighth angle structure 60 is 120°;

[0210] Step 4.4.6: Roll-bend the fifth transverse wall 11 and the third vertical wall 8 so that the seventh angle structure 59 is 100° and the eighth angle structure 60 is 110°;

[0211] Step 4.4.7: Roll-bend the fifth transverse wall 11 and the third vertical wall 8 so that the seventh angle structure 59 is 90°, forming the seventh angle structure 33, and the eighth angle structure 60 is 100°;

[0212] Step 4.4.8: Roll-bend the fifth transverse wall 11 so that the eighth corner structure 60 is 90°, thereby forming an eighth corner structure 34.

[0213] Step 5: Laser welding is performed on the connection between the fourth vertical wall 10 and the first vertical wall 1 , so that the second vertical wall 5 , the third vertical wall 8 , the fourth horizontal wall 9 and the first vertical wall 1 form a first cavity 12 and a second cavity 13 ;

[0214] Step 6: Roll-bend the end of the fifth transverse wall 11 away from the fourth vertical wall 10 to form a connecting edge 14 and a sixth transverse wall 15 connected thereto; a ninth corner structure 35 is formed between the connecting edge 14 and the sixth transverse wall 15. Step 6 specifically includes the following steps:

[0215] Step 6.1: Roll-bend the end of the fifth transverse wall 11 away from the fourth vertical wall 10 to form a connecting edge 14 and a sixth transverse wall 15 , with a ninth corner structure 61 formed between the connecting edge 14 and the sixth transverse wall 15 ;

[0216] Step 6.2: Roll-bending the connecting edge 14 multiple times to gradually reduce the angle of the ninth corner structure 61 to form a ninth corner structure 35;

[0217] In step 6.1, the ninth angle structure 61 is 180°;

[0218] Step 6.2 specifically includes the following steps:

[0219] Step 6.2.1: Roll-bend the connecting edge 14 so that the ninth angle structure 61 is 150°;

[0220] Step 6.2.2: Roll-bend the connecting edge 14 so that the ninth angle structure 61 is 120°;

[0221] Step 6.2.3: Roll-bend the connecting edge 14 so that the ninth corner structure 61 is 90°, thereby forming a ninth corner structure 35 .

[0222] Step 7: Roll-bend the sixth transverse wall 15 to form a fifth vertical wall 16 and a seventh transverse wall 17 connected to each other; the connecting edge 14 abuts against the second vertical wall 5; a tenth bent corner structure 36 is formed between the fifth vertical wall 16 and the seventh transverse wall 17, with both ends of the fifth vertical wall 16 connected to the seventh transverse wall 17 and the connecting edge 14, respectively. Step 7 specifically includes the following steps:

[0223] Step 7.1: Roll-bending the sixth transverse wall 15 to form a fifth vertical wall 16 and a seventh transverse wall 17 , with a tenth corner structure 62 formed between the fifth vertical wall 16 and the seventh transverse wall 17 ;

[0224] Step 7.2: Roll-bend the fifth vertical wall 16 multiple times to gradually reduce the angle of the tenth angle structure 62 to form the tenth angle structure 36.

[0225] In step 7.1, the tenth angle structure 62 is 163°;

[0226] Step 7.2 specifically includes the following steps:

[0227] Step 7.2.1: Roll-bend the fifth vertical wall 16 so that the tenth angle structure 62 is 145°;

[0228] Step 7.2.2: Roll-bend the fifth vertical wall 16 so that the tenth angle structure 62 is 130°;

[0229] Step 7.2.3: Roll-bend the fifth vertical wall 16 so that the tenth angle structure 62 is 115°;

[0230] Step 7.2.4: Roll-bend the fifth vertical wall 16 so that the tenth angle structure 62 is 100°;

[0231] Step 7.2.5: Roll-bend the fifth vertical wall 16 so that the tenth angle structure 62 is 90°, thereby forming the tenth angle structure 36 .

[0232] Step 8: Laser weld the connection between the connecting edge 14 and the second vertical wall 5, and the fourth vertical wall 10, the fifth vertical wall 16, the seventh horizontal wall 17 and the second vertical wall 5 form a third cavity 18 and a fourth cavity 19, and form a left longitudinal beam portion 49 and a right longitudinal beam portion 50 at the opposite ends of the bottom plate 3.

[0233] The method for preparing the roll-formed frame further comprises the following steps:

[0234] Step 9: Cut the left longitudinal beam 49 and the right longitudinal beam 50 at the four corners of the bottom plate 3 to form the front longitudinal beam 37 and the rear longitudinal beam 38 at the other opposite ends of the bottom plate 3;

[0235] Step 10: Bending the front longitudinal beam plate 37 and the rear longitudinal beam plate 38 to form a sixth vertical wall 39 and an eighth transverse wall 40 , and forming an eleventh corner structure 41 between the sixth vertical wall 39 and the eighth transverse wall 40 ;

[0236] Step 11: Bending the eighth transverse wall 40 to form a seventh vertical wall 42 and a ninth transverse wall 43 , and forming a twelfth corner structure 44 between the seventh vertical wall 42 and the ninth transverse wall 43 ;

[0237] Step 12: Bend the seventh vertical wall 42 to form an eighth vertical wall 45 and a tenth transverse wall 46 , and form a thirteenth angle structure 47 between the eighth vertical wall 45 and the tenth transverse wall 46 ;

[0238] Step 13: Bend the ninth transverse wall 43 so that the sixth vertical wall 39 abuts against the bottom plate 3 , forming a fourteenth angle structure 48 between the ninth transverse wall 43 and the bottom plate 3 , and forming a front longitudinal beam portion 51 and a rear longitudinal beam portion 52 at the other opposite ends of the bottom plate 3 ;

[0239] Step 14: Weld the connection between the front longitudinal beam 51 and the left longitudinal beam 49, weld the connection between the front longitudinal beam 51 and the right longitudinal beam 50, weld the connection between the rear longitudinal beam 52 and the left longitudinal beam 49, weld the connection between the rear longitudinal beam 52 and the right longitudinal beam 50, and weld the connection between the sixth vertical wall 39 and the bottom plate 3.

[0240] This embodiment also provides a roll-formed frame, which is prepared using the above-mentioned method for preparing the roll-formed frame.

[0241] The roll-forming frame provided in this embodiment includes a base plate 3, a left longitudinal beam portion 49 and a right longitudinal beam portion 50; the left longitudinal beam portion 49 and the right longitudinal beam portion 50 are respectively arranged at opposite ends of the base plate 3, and the left longitudinal beam portion 49 and the right longitudinal beam portion 50 both include a first vertical wall 1, a fourth transverse wall 9, a third vertical wall 8, a second vertical wall 5, a fourth vertical wall 10, a seventh transverse wall 17, a fifth vertical wall 16 and a connecting edge 14 connected in sequence, the fourth transverse wall 9, the third vertical wall 8 and the second vertical wall 5 constitute a first recess structure, the second vertical wall 5, the fourth vertical wall 10 and the seventh transverse wall 17 constitute a second recess structure, the first vertical wall 1 is connected to the open end of the first recess structure, the fourth vertical wall 10 is connected and arranged on the first vertical wall 1, the fifth vertical wall 16 is connected and arranged at the open end of the second recess structure, and the connecting edge 14 is connected and arranged at an end of the second vertical wall 5 close to the third vertical wall 8.

[0242] This embodiment uses high-strength steel strip as raw material, and is designed to have a special-shaped cavity on both sides. The special-shaped cavity is in the shape of a Japanese character, and there is a bottom support structure in the middle of the cavity. The structure is a steel plate. The cavities on both sides and the bottom support structure are formed as one piece. The cavity is laser welded and the processing technology is roll forming.

[0243] Based on the above-mentioned one-piece rolled profile, the front and rear end steel plates are processed using a bending process to form a predetermined cavity, and then the joints are welded to finally form an one-piece formed frame.

[0244] Example 2:

[0245] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0246] This embodiment provides a method for preparing a roll-formed frame, wherein the material is high-strength steel with a strength of 600 MPa or above, thereby achieving lightweight material.

[0247] In the preparation method of this embodiment, after the steel strip passes through the roll-forming die, the two sides of the steel strip are roll-formed separately to form multiple cavities on the left and right. The cavities are connected as one through the steel strip, serving as the bottom plate of the battery frame. The left and right cavities are longitudinal beams for frame support and collision prevention. The front and rear steel strips are formed into two single-cavity cross beams through a bending process, and finally welded into an integrated roll-formed battery frame.

[0248] The preparation method of this embodiment includes the following steps:

[0249] Passes 1 to 9:

[0250] The roller die gradually forms two vertical walls and two horizontal plates, distributed on the left and right. The lower steel strip forms a bottom plate, connecting the two sides, and finally forming a "hat-shaped" shape;

[0251] Left and right 1# bend forming, 1st to 8th pass: the optimal angles are 177°, 170°, 160°, 145°, 130°, 115°, 100°, and 90°, respectively;

[0252] Left and right 2# bend forming, 2nd to 9th pass: the optimal angles are 172°, 162°, 148°, 132°, 118°, 103°, 93°, and 90° respectively.

[0253] Passes 10 to 15:

[0254] The left and right horizontal plates are gradually roll-formed by a roll-forming die, and finally formed into a stepped structure;

[0255] Left and right 3# bend forming, 10th to 14th passes: the optimal angles are 3°, 15°, 30°, 45°, and 54°, respectively;

[0256] Left and right 4# bend forming, 11th to 15th passes: the optimal angles are 13°, 28°, 42°, 52°, and 54°, respectively;

[0257] After being bent by a rolling die, a step can be formed, with an optimal step height of 2mm, for the installation of sealing strips and / or sealants.

[0258] Passes 16 to 23:

[0259] The left and right horizontal plates are gradually roll-formed by a roll-forming die to finally form the left and right second vertical walls and the second horizontal wall;

[0260] Left and right 5# bend forming, 16th to 22nd passes: the optimal angles are 176°, 165°, 150°, 135°, 120°, 105°, and 90°, respectively;

[0261] Left and right 6# bend forming, 17th to 23rd passes: the optimal angles are 170°, 155°, 140°, 125°, 110°, 95°, and 90°, respectively.

[0262] Passes 24 to 34:

[0263] The horizontal edge between the step and the second vertical wall is gradually roll-formed and bent by a rolling die, and the second horizontal edge is further roll-formed and bent, wherein the second horizontal edge contacts the first vertical wall after being bent 90 degrees, thereby forming a first cavity and a second cavity;

[0264] Left and right 7# bend forming, 24th to 33rd passes: the optimal angles are 175°, 170°, 160°, 150°, 140°, 130°, 120°, 110°, 100°, and 90°;

[0265] For the left and right 8# bend forming, from the 26th to the 34th pass, the optimal angles are 170°, 160°, 150°, 140°, 130°, 120°, 110°, 100°, and 90°, respectively.

[0266] 35th welding pass:

[0267] The left and right second horizontal edges are gradually laser welded at their contact points with the left and right first vertical walls through a rolling die to form a closed first cavity and a second cavity. The steel plate is now formed into a whole to ensure the stability and strength of the structure.

[0268] Passes 36 to 39:

[0269] The left and right second transverse edges are gradually rolled and bent by a rolling die to form a small welding edge;

[0270] Left and right 9# bend forming, 36th to 39th passes: the optimal angles are 180°, 150°, 120°, and 90°, respectively.

[0271] Passes 40 to 45:

[0272] The left and right second horizontal sides and the small welding side are gradually rolled and bent by the rolling die to form a 10# bend angle;

[0273] For left and right 10# bend forming, the 40th to 45th passes: the optimal angles are 163°, 145°, 130°, 115°, 100°, and 90°, respectively.

[0274] Welding pass 46:

[0275] The left and right second vertical sides are gradually laser welded at their contact points with the left and right welding small sides through a rolling die to form closed third and fourth cavities. The steel plate is now formed into a whole with a total of four cavities, and the forming is completed to ensure the stability and strength rigidity of the overall structure.

[0276] As shown in Figure 29, it is a schematic diagram of the product. Figure 31 As shown, the profile is rolled in one piece and cut at the four corners. Figure 32 As shown, the bottom plate is bent at an angle of 90 degrees, with a small side bent downward. Figure 33 As shown, the bottom plate is bent at an angle of 90 degrees with one vertical side bent upwards. Figure 34 As shown, the bottom plate is bent at an angle of 90 degrees, with one horizontal side bent upwards. Figure 35 As shown, the bottom plate is bent at an angle of 90 degrees at the front and back, with one vertical side bent upwards, thus forming a frame.

[0277] The frame is welded all around using welding technology to form a whole, ensuring the integrity, stability and performance requirements of the entire frame structure.

[0278] Process flow: Cancel the offline welding process, reduce equipment investment and manpower input, and significantly reduce equipment investment, plant investment and processing costs, etc., with huge economic benefits.

[0279] The present invention adopts advanced roll forming technology for online integrated forming, and the product quality is good during the process, and the production stability and efficiency are high.

[0280] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0281] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A method for preparing a roll-formed frame, characterized in that: The steps include: Step 1: Roll-bending the opposite ends of the plate to be processed respectively to form a first vertical wall (1) and a first horizontal wall (2) connected to each other at the opposite ends of the plate to be processed, and forming a bottom plate (3) between the two first vertical walls (1); Step 2: Roll-bending one end of the first transverse wall (2) close to the first vertical wall (1) to form a step-bending structure (4); Step 3: Roll-bending the first transverse wall (2) to form a second vertical wall (5), a second transverse wall (6), and a third transverse wall (7) connected to each other; Step 4: Roll-bending the second transverse wall (6) to form a third vertical wall (8) and a fourth transverse wall (9) connected to each other; Roll-bending the third transverse wall (7) to form a fourth vertical wall (10) and a fifth transverse wall (11) connected to each other; the fourth vertical wall (10) abuts against the first vertical wall (1) structure; Step 5: Laser welding is performed on the connection between the fourth vertical wall (10) and the first vertical wall (1), so that the second vertical wall (5), the third vertical wall (8), the fourth transverse wall (9) and the first vertical wall (1) form a first cavity (12) and a second cavity (13); Step 6: Roll-bending the end of the fifth transverse wall (11) away from the fourth vertical wall (10) to form a connecting edge (14) and a sixth transverse wall (15); Step 7: Roll-bending the sixth transverse wall (15) to form a fifth vertical wall (16) and a seventh transverse wall (17) connected to each other; the connecting edge (14) abuts against the second vertical wall (5); Step 8: Laser welding is performed on the connection between the connecting edge (14) and the second vertical wall (5), and the fourth vertical wall (10), the fifth vertical wall (16), the seventh transverse wall (17) and the second vertical wall (5) form a third cavity (18) and a fourth cavity (19).

2. The method for preparing a roll-formed frame according to claim 1, wherein: In step 1, a first angle structure (27) is formed between the first vertical wall (1) and the bottom plate (3) structure, and a second angle structure (28) is formed between the first transverse wall (2) and the first vertical wall (1); In step 2, a third corner structure (29) and a fourth corner structure (30) are formed in the step-bending structure (4); In step 3, the two ends of the second transverse wall (6) are respectively connected to the step-bending structure (4) and the second vertical wall (5), a fifth angle structure (31) is formed between the second transverse wall (6) and the second vertical wall (5), and a sixth angle structure (32) is formed between the second vertical wall (5) and the third transverse wall (7); In step 4, a seventh angle structure (33) is formed between the third vertical wall (8) and the fourth transverse wall (9), and the two ends of the fourth transverse wall (9) are respectively connected to the step-bending structure (4) and the third vertical wall (8); An eighth corner structure (34) is formed between the fourth vertical wall (10) and the fifth transverse wall (11), and two ends of the fourth vertical wall (10) are respectively connected to the fifth transverse wall (11) and the second vertical wall (5); In step 6, a ninth corner structure (35) is formed between the connecting edge (14) and the sixth transverse wall (15); In step 7, a tenth angle structure (36) is formed between the fifth vertical wall (16) and the seventh transverse wall (17), and the two ends of the fifth vertical wall (16) are respectively connected to the connecting edge (14) and the seventh transverse wall (17).

3. The method for preparing a roll-formed frame according to claim 2, wherein: The step 1 specifically includes the following steps: Step 1.1: Roll-bending the opposite ends of the plate to be processed respectively, forming a first side structure (20) and a second side structure (21) at the opposite ends of the plate to be processed respectively, forming the bottom plate (3) between the first side structure (20) and the second side structure (21), and forming a first corner structure (53) between the first side structure (20) and the bottom plate (3) and between the second side structure (21) and the bottom plate (3); Step 1.2: Roll-bending the first side structure (20) and the second side structure (21) to form the first vertical wall (1) and the first transverse wall (2), wherein a second corner structure (54) is formed between the first vertical wall (1) and the first transverse wall (2); Step 1.3: The first vertical wall (1) and the first transverse wall (2) are subjected to multiple roller bending, and the angle of the first corner structure (53) is gradually reduced to form the first bent corner structure (27), and the angle of the second corner structure (54) is gradually reduced to form the second bent corner structure (28).

4. The method for preparing a roll-formed frame according to claim 3, wherein: In the step 1.1, the first angle structure (53) is 177°; In step 1.2, the first angle structure (53) is 170°, and the second angle structure (54) is 172°; The step 1.3 specifically includes the following steps: Step 1.3.1: Roll-bending the first vertical wall (1) and the first transverse wall (2) so that the first angle structure (53) is 160° and the second angle structure (54) is 162°; Step 1.3.2: Roll-bending the first vertical wall (1) and the first transverse wall (2) so that the first angle structure (53) is 145° and the second angle structure (54) is 148°; Step 1.3.3: Roll-bending the first vertical wall (1) and the first transverse wall (2) so that the first angle structure (53) is 130° and the second angle structure (54) is 132°; Step 1.3.4: Roll-bending the first vertical wall (1) and the first transverse wall (2) so that the first angle structure (53) is 115° and the second angle structure (54) is 118°; Step 1.3.5: Roll-bending the first vertical wall (1) and the first transverse wall (2) so that the first angle structure (53) is 100° and the second angle structure (54) is 103°; Step 1.3.6: Roll-bending the first vertical wall (1) and the first transverse wall (2) so that the first angle structure (53) is 90°, forming the first bent angle structure (27), and the second angle structure (54) is 93°; Step 1.3.7: Roll-bend the first transverse wall (2) so that the second angle structure (54) is 90°, thereby forming the second angle structure (28).

5. The method for preparing a roll-formed frame according to claim 2, wherein: The step 2 specifically includes the following steps: Step 2.1: Roll-bending one end of the first transverse wall (2) close to the first vertical wall (1) to form a stepped plane structure (22) and a third side structure (23), wherein a third corner structure (55) is formed between the stepped plane structure (22) and the third side structure (23); Step 2.2: Roll-bending the third side structure (23) to form a stepped inclined surface structure (24) and a fourth side structure (25); forming the third corner structure (55) between the stepped plane structure (22) and the stepped inclined surface structure (24); and forming the fourth corner structure (56) between the stepped inclined surface structure (24) and the fourth side structure (25); Step 2.3: The fourth side structure (25) and the step slope structure (24) are subjected to multiple roller bending, and the angle of the third corner structure (55) is gradually increased to form the third corner structure (29), and the angle of the fourth corner structure (56) is gradually increased to form the fourth corner structure (30).

6. The method for preparing a roll-formed frame according to claim 5, wherein: In the step 2.1, the third angle structure (55) is 3°; In step 2.2, the third angle structure (55) is 15°, and the fourth angle structure (56) is 13°; The step 2.3 specifically includes the following steps: Step 2.3.1: Roll-bending the fourth side structure (25) and the step slope structure (24) so ​​that the third angle structure (55) is 30° and the fourth angle structure (56) is 28°; Step 2.3.2: Roll-bending the fourth side structure (25) and the step slope structure (24) so ​​that the third angle structure (55) is 45° and the fourth angle structure (56) is 42°; Step 2.3.3: Roll-bending the fourth side structure (25) and the step slope structure (24) to make the third angle structure (55) 54°, forming the third angle structure (29), and making the fourth angle structure (56) 52°; Step 2.3.4: Roll-bend the fourth side structure (25) so that the fourth corner structure (56) is 54°, thereby forming the fourth corner structure (30).

7. The method for preparing a roll-formed frame according to claim 2, wherein: The step 3 specifically includes the following steps: Step 3.1: Roll-bending the first transverse wall (2) to form the second transverse wall (6) and the fifth side structure (26), and forming a fifth corner structure (57) between the second transverse wall (6) and the fifth side structure (26); Step 3.2: Roll-bending the fifth side structure (26) to form the second vertical wall (5) and the third transverse wall (7), forming the fifth corner structure (57) between the second transverse wall (6) and the second vertical wall (5), and forming the sixth corner structure (58) between the second vertical wall (5) and the third transverse wall (7); Step 3.3: The second vertical wall (5) and the third transverse wall (7) are subjected to multiple roller bending, and the angle of the fifth corner structure (57) is gradually reduced to form the fifth corner structure (31), and the angle of the sixth corner structure (58) is gradually reduced to form the sixth corner structure (32).

8. The method for preparing a roll-formed frame according to claim 7, wherein: In the step 3.1, the fifth angle structure (57) is 176°; In step 3.2, the fifth angle structure (57) is 165°, and the sixth angle structure (58) is 170°; The step 3.3 specifically includes the following steps: Step 3.3.1: Roll-bending the second vertical wall (5) and the third transverse wall (7) so that the fifth angle structure (57) is 150° and the sixth angle structure (58) is 155°; Step 3.3.2: Roll-bending the second vertical wall (5) and the third transverse wall (7) so that the fifth angle structure (57) is 135° and the sixth angle structure (58) is 140°; Step 3.3.3: Roll-bending the second vertical wall (5) and the third transverse wall (7) so that the fifth angle structure (57) is 120° and the sixth angle structure (58) is 125°; Step 3.3.4: Roll-bending the second vertical wall (5) and the third transverse wall (7) so that the fifth angle structure (57) is 105° and the sixth angle structure (58) is 110°; Step 3.3.5: Roll-bending the second vertical wall (5) and the third transverse wall (7) so that the fifth angle structure (57) is 90°, forming the fifth angle structure (31), and the sixth angle structure (58) is 95°; Step 3.3.6: Roll-bend the third transverse wall (7) so that the sixth angle structure (58) is 90°, thereby forming the sixth angle structure (32).

9. The method for preparing a roll-formed frame according to claim 2, wherein: The step 4 specifically includes the following steps: Step 4.1: Roll-bending the second transverse wall (6) to form the third vertical wall (8) and the fourth transverse wall (9), and forming a seventh corner structure (59) between the third vertical wall (8) and the fourth transverse wall (9); Step 4.2: Roll-bending the third vertical wall (8) and adjusting the seventh corner structure (59) to reduce the first angle; Step 4.3: Rolling the third transverse wall (7) to form the fourth vertical wall (10) and the fifth transverse wall (11), forming an eighth angle structure (60) between the fourth vertical wall (10) and the fifth transverse wall (11); rolling and bending the third vertical wall (8) to perform a second angle reduction adjustment on the seventh angle structure (59); Step 4.4: The fifth transverse wall (11) and the third vertical wall (8) are subjected to multiple roller bending, and the angle of the seventh corner structure (59) is gradually reduced to form the seventh corner structure (33), and the angle of the eighth corner structure (60) is gradually reduced to form the eighth corner structure (34).

10. The method for preparing a roll-formed frame according to claim 9, wherein: In the step 4.1, the seventh angle structure (59) is formed at 175°; In the step 4.2, the seventh angle structure (59) is 170°; In step 4.3, the seventh angle structure (59) is 160°, and the eighth angle structure (60) is 170°; The step 4.4 specifically includes the following steps: Step 4.4.1: Roll-bending the fifth transverse wall (11) and the third vertical wall (8) so that the seventh angle structure (59) is 150° and the eighth angle structure (60) is 160°; Step 4.4.2: Roll-bending the fifth transverse wall (11) and the third vertical wall (8) so that the seventh angle structure (59) is 140° and the eighth angle structure (60) is 150°; Step 4.4.3: Roll-bending the fifth transverse wall (11) and the third vertical wall (8) so that the seventh angle structure (59) is 130° and the eighth angle structure (60) is 140°; Step 4.4.4: Roll-bending the fifth transverse wall (11) and the third vertical wall (8) so that the seventh angle structure (59) is 120° and the eighth angle structure (60) is 130°; Step 4.4.5: Roll-bending the fifth transverse wall (11) and the third vertical wall (8) so that the seventh angle structure (59) is 110° and the eighth angle structure (60) is 120°; Step 4.4.6: Roll-bending the fifth transverse wall (11) and the third vertical wall (8) so that the seventh angle structure (59) is 100° and the eighth angle structure (60) is 110°; Step 4.4.7: Roll-bending the fifth transverse wall (11) and the third vertical wall (8) to make the seventh angle structure (59) 90°, forming the seventh angle structure (33), and making the eighth angle structure (60) 100°; Step 4.4.8: Roll-bending the fifth transverse wall (11) so that the eighth angle structure (60) is 90°, thereby forming the eighth angle structure (34).

11. The method for preparing a roll-formed frame according to claim 2, wherein: The step 6 specifically includes the following steps: Step 6.1: Roll-bending the end of the fifth transverse wall (11) away from the fourth vertical wall (10) to form the connecting edge (14) and the sixth transverse wall (15), and forming a ninth corner structure (61) between the connecting edge (14) and the sixth transverse wall (15); Step 6.2: Roll-bending the connecting edge (14) multiple times to gradually reduce the angle of the ninth corner structure (61) to form the ninth corner structure (35).

12. The method for preparing a roll-formed frame according to claim 11, wherein: In the step 6.1, the ninth angle structure (61) is 180°; The step 6.2 specifically includes the following steps: Step 6.2.1: Roll-bending the connecting edge (14) so ​​that the ninth angle structure (61) is 150°; Step 6.2.2: Roll-bending the connecting edge (14) so ​​that the ninth angle structure (61) is 120°; Step 6.2.3: Roll-bend the connecting edge (14) so ​​that the ninth angle structure (61) is 90°, thereby forming the ninth angle structure (35).

13. The method for preparing a roll-formed frame according to claim 2, wherein: The step 7 specifically includes the following steps: Step 7.1: Roll-bending the sixth transverse wall (15) to form the fifth vertical wall (16) and the seventh transverse wall (17), and forming a tenth corner structure (62) between the fifth vertical wall (16) and the seventh transverse wall (17); Step 7.2: Roll-bending the fifth vertical wall (16) multiple times to gradually reduce the angle of the tenth corner structure (62) to form the tenth corner structure (36).

14. The method for preparing a roll-formed frame according to claim 13, wherein: In the step 7.1, the tenth angle structure (62) is 163°; The step 7.2 specifically includes the following steps: Step 7.2.1: Roll-bending the fifth vertical wall (16) so that the tenth angle structure (62) is 145°; Step 7.2.2: Roll-bending the fifth vertical wall (16) so that the tenth angle structure (62) is 130°; Step 7.2.3: Roll-bending the fifth vertical wall (16) so that the tenth angle structure (62) is 115°; Step 7.2.4: Roll-bending the fifth vertical wall (16) so that the tenth angle structure (62) is 100°; Step 7.2.5: Roll-bend the fifth vertical wall (16) so that the tenth angle structure (62) is 90°, thereby forming the tenth angle structure (36).

15. The method for preparing a roll-formed frame according to claim 2, wherein: In step 8, a left longitudinal beam portion (49) and a right longitudinal beam portion (50) are formed at opposite ends of the bottom plate (3); The method for preparing the roll-formed frame further comprises the following steps: Step 9: Cut the left longitudinal beam portion (49) and the right longitudinal beam portion (50) located at the four corners of the bottom plate (3), and form a front longitudinal beam plate (37) and a rear longitudinal beam plate (38) at the other opposite ends of the bottom plate (3); Step 10: Bending the front longitudinal beam plate (37) and the rear longitudinal beam plate (38) to form a sixth vertical wall (39) and an eighth transverse wall (40), and forming an eleventh angle structure (41) between the sixth vertical wall (39) and the eighth transverse wall (40); Step 11: bending the eighth transverse wall (40) to form a seventh vertical wall (42) and a ninth transverse wall (43), and forming a twelfth angle structure (44) between the seventh vertical wall (42) and the ninth transverse wall (43); Step 12: bending the seventh vertical wall (42) to form an eighth vertical wall (45) and a tenth transverse wall (46), and forming a thirteenth angle structure (47) between the eighth vertical wall (45) and the tenth transverse wall (46); Step 13: bending the ninth transverse wall (43) so that the sixth vertical wall (39) abuts against the bottom plate (3), forming a fourteenth angle structure (48) between the ninth transverse wall (43) and the bottom plate (3), and forming a front longitudinal beam portion (51) and a rear longitudinal beam portion (52) at the other opposite ends of the bottom plate (3); Step 14: Welding the connection between the front longitudinal beam portion (51) and the left longitudinal beam portion (49), welding the connection between the front longitudinal beam portion (51) and the right longitudinal beam portion (50), welding the connection between the rear longitudinal beam portion (52) and the left longitudinal beam portion (49), welding the connection between the rear longitudinal beam portion (52) and the right longitudinal beam portion (50), and welding the connection between the sixth vertical wall (39) and the bottom plate (3).

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