A method for bending forming a multi-channel bent sheet metal product

Abstract

The application belongs to the technical field of sheet metal processing, and provides a bending forming method for a multi-bending sheet metal product, which comprises the following steps: S1 blanking, the product after blanking comprises a first part and a second part, the first part is provided with a first circumferential fold line, a third transverse fold line, a fifth longitudinal fold line, a seventh longitudinal fold line and a tenth longitudinal fold line; the second part is located on the side of the tenth longitudinal fold line and outside the tenth longitudinal fold line; S2 first sequence bending, synchronous bending along the first circumferential fold line and the seventh longitudinal fold line, and the first circumferential fold line is formed with an inner buckle structure; S3 second sequence bending, downward bending along the third transverse fold line and the fifth longitudinal fold line; S4 third sequence bending, downward bending along the tenth longitudinal fold line. The bending forming method for the multi-bending sheet metal product can simplify the forming process of the sheet metal product with a multi-bending structure, improve the production efficiency, accordingly reduce the number of molds, reduce the cost of molds, and reduce the mold debugging and maintenance time.

Description

Technical Field

[0001] This invention belongs to the field of sheet metal processing technology, specifically relating to a bending and forming method for sheet metal products with multiple bends. Background Technology

[0002] like Figures 1 to 4 The sheet metal product shown has multiple bending structures, such as flanges i, a, h, and d. Flanges h and d are two bending structures that intersect longitudinal and transverse bending, forming a closed L-shaped edge k. At the same time, flanges i and a are also bent with inward buckling structures j and f, respectively.

[0003] The above-mentioned sheet metal products have complex bending structures. Conventional bending and forming schemes involve bending one step at a time or partially integrating them. When forming the L-shaped edge k, it is necessary to first fold the flange h, and then fold the flange d through the protective material. Traditional bending schemes have many processes and a large number of corresponding molds. Furthermore, the L-shaped edge k is prone to defects such as material extrusion and wrinkling, uneven bending radius, and peeling of the product surface coating.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] In view of the problems pointed out in the background art, the present invention provides a bending and forming method for multi-bending sheet metal products, which can reduce the forming process and the number of molds, improve forming efficiency, reduce mold costs, and ensure bending and forming quality.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution: In some embodiments of this application, a bending forming method for multi-bend sheet metal products is provided, including the following steps: S1. A flat product to be processed is blanked. The blanked product includes a first part and a second part arranged in a transverse direction. The longitudinal length of the second part is less than that of the first part. At least a notch is formed between the first end of the second part and the first end of the first part on the same side. The first end of the first part is provided with a first circumferential fold line, a third transverse fold line, and a fifth longitudinal fold line. The opposite sides of the first part are provided with a seventh longitudinal fold line and a tenth longitudinal fold line. The second part is located on the side of the tenth longitudinal fold line and outside the tenth longitudinal fold line. The first circumferential fold line includes a transverse segment, a longitudinal straight segment connecting one end of the transverse segment, and a longitudinal stepped segment connecting the other end of the transverse segment. The two ends of the fifth longitudinal fold line are respectively connected to the longitudinal straight segment of the first circumferential fold line and the seventh longitudinal fold line. The first end of the tenth longitudinal fold line is connected to the longitudinal stepped segment of the first circumferential fold line, and the second end extends to the second end of the first part. The two ends of the third transverse fold line intersect the fifth longitudinal fold line and the tenth longitudinal fold line perpendicularly, and do not intersect the longitudinal stepped segment of the first circumferential fold line. S2, First-order bending: The blanked product is bent simultaneously along the first circumferential fold line and the seventh longitudinal fold line, and the lateral edge of the bending part corresponding to the lateral segment of the first circumferential fold line is simultaneously formed with an inner buckling structure. S3, Second bending: Bend the product after the first bending downwards along the third horizontal fold line and the fifth vertical fold line; S4. Third bending: Bend the product after the second bending downwards along the tenth longitudinal fold line.

[0007] In some embodiments of this application, in step S1, the second part is further provided with an eighth longitudinal broken line and a ninth longitudinal broken line, the ninth longitudinal broken line and the eighth longitudinal broken line being arranged from the inside to the outside relative to the tenth longitudinal broken line; In step S2, the eighth longitudinal fold line is bent synchronously with the first circumferential fold line and the seventh longitudinal fold line, and the longitudinal edge of the bent portion corresponding to the eighth longitudinal fold line is synchronously formed with an inward buckling structure. In step S3, the second bending process involves the ninth longitudinal fold line bending downwards simultaneously with the third transverse fold line and the fifth longitudinal fold line; and a U-shaped bend is formed between the eighth longitudinal fold line and the ninth longitudinal fold line. Furthermore, after the third bending in step S4 is completed, the opening direction of the U-shaped bend is opposite to the bending direction of the inner buckling structure on the longitudinal edge of the bending portion corresponding to the eighth longitudinal fold line.

[0008] In some embodiments of this application, the first die used in step S2, the first sequential bending, includes: The first mold upper mold includes a first mold upper mold base, a first mold upper insert, a first mold bending punch, a first floating plate and a second floating plate located below the first floating plate. The first mold bending punch is disposed on the first floating plate, and the first mold upper insert is fixed on the first mold upper mold base. The bottom end of the first mold upper insert has a first inclined surface and a second inclined surface. The first mold lower die includes a first mold lower die base, a first mold lower template, a sliding member, a lower outer insert, a lower inner insert, a side-folding punch, and a male die. The lower outer insert has a third inclined surface that mates with a first inclined surface, and the lower inner insert has a fourth inclined surface that mates with a second inclined surface. The sliding member is slidably mounted on the first mold lower die base, and the lower inner insert and the side-folding punch are slidably mounted on the sliding member. The male die includes a fixed male die, a sliding male die, and a slider. The fixed male die is fixedly mounted on the first mold lower die base, and the sliding male die and the lower outer insert are fixedly mounted on the sliding member. The slider is configured to slide to a first position and a second position. When the sliding male die slides away from the fixed male die to its position, the slider is in the first position, which closes the gap between the sliding male die and the fixed male die and participates in the first-order bending. When the slider is in the second position, it avoids the sliding male die and slides closer to the fixed male die, so that the sliding male die can avoid the inner buckling structure when the mold is opened.

[0009] In some embodiments of this application, the slider is located between the sliding male mold and the fixed male mold. The inner side of the sliding male mold is provided with a hook block. When the mold is closed, the sliding male mold slides away from the fixed male mold, and the hook block pushes the slider to slide to the first position. When the mold is opened, the sliding male mold slides closer to the fixed male mold and pushes the slider to slide to the second position.

[0010] In some embodiments of this application, the fixed male mold has a first inclined side facing the sliding male mold, the slider has a second inclined side matching the first inclined side, and the first inclined side and the second inclined side have mutually cooperating oblique sliding guide structures formed thereon.

[0011] In some embodiments of this application, the sliding male mold and the slider abut against each other with a plane, the plane being perpendicular to the sliding direction of the sliding male mold.

[0012] In some embodiments of this application, the third die used in step S4, the third sequential bending, includes: The third mold upper die includes a third mold upper die base, a third mold upper insert, a third mold bending punch, a pressure plate, and a bending corner insert. The third mold upper insert includes a fixed base and a sliding insert. The fixed base is fixed to the third mold upper die base, and the sliding insert is slidably disposed below the fixed base. Its sliding direction is parallel to the extension direction of the tenth longitudinal fold line. The bottom outer side of the sliding insert has a fifth inclined surface. The bending corner insert is disposed on the bottom inner side of the sliding insert and corresponds to the connection between the first end of the tenth longitudinal fold line and the longitudinal step segment of the first circumferential fold line. The third mold lower die includes a third mold lower die base, a third mold lower template, a bending male die, and a third mold lower insert, wherein the third mold lower insert has a sixth inclined surface that cooperates with the fifth inclined surface; The bending corner insert and the third mold bending punch are configured such that: the bending corner insert first cooperates with the bending male mold for bending, and the third mold bending punch then cooperates with the bending male mold for bending, and the parts of the third mold bending punch that cooperate with the bending male mold and the parts of the bending corner insert that cooperate with the bending male mold have overlapping areas.

[0013] In some embodiments of this application, a sliding guide structure is formed between the sliding insert and the fixed base to cooperate with each other.

[0014] In some embodiments of this application, a sliding insert reset component is formed between the sliding insert and the fixed base, which is used to drive the sliding insert to slide and reset when the mold is opened.

[0015] In some embodiments of this application, the bent corner insert is detachably mounted on the sliding insert.

[0016] Compared with the prior art, the advantages and positive effects of this application are: 1. The bending and forming method for multi-bending sheet metal products of this application can simplify the forming process of sheet metal products with multi-bending structures, improve production efficiency, and correspondingly reduce the number of molds, reduce mold costs, and reduce mold debugging and maintenance time. 2. During the second bending, the product after the first bending is bent downwards along the third transverse fold line and the fifth longitudinal fold line. Then, the product after the second bending is bent downwards along the tenth longitudinal fold line. Since the first end of the tenth longitudinal fold line connects to the longitudinal step segment of the first circumferential fold line, and the two ends of the third transverse fold line intersect the fifth longitudinal fold line and the tenth longitudinal fold line perpendicularly respectively, and do not intersect with the longitudinal step segment of the first circumferential fold line, this avoids defects such as material accumulation and wrinkling in the intersection area of ​​the transverse and longitudinal bending after the third bending, and improves the product forming quality.

[0017] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A three-dimensional structural diagram of a sheet metal product with multiple bends from one perspective; Figure 2 for Figure 1 Enlarged view of part A; Figure 3 A three-dimensional structural diagram of a sheet metal product with multiple bends from another perspective; Figure 4 for Figure 3 Enlarged view of part B; Figure 5 This is a schematic diagram of the structure of the flat sheet metal product after blanking in the bending and forming method of multi-bending sheet metal products according to the embodiment; Figure 6 for Figure 5 Enlarged view of part C; Figure 7 This is a side front view of the product after the first bending in the bending forming method of multi-bending sheet metal products according to the embodiment; Figure 8 This is a front view of the end face of the product after the first bending in the bending forming method of multi-bending sheet metal products according to the embodiment; Figure 9 This is a side front view of the product after the second bending in the bending forming method of multi-bending sheet metal products according to the embodiment; Figure 10 This is a front view of the end face of the product after the second bending in the bending forming method of multi-bending sheet metal products according to the embodiment; Figure 11 This is a side front view of the product after the third bending in the bending forming method of multi-bending sheet metal products according to the embodiment; Figure 12 This is a front view of the end face of the product after the third bending in the bending forming method of multi-bending sheet metal products according to the embodiment; Figure 13 This is a schematic diagram of the mold opening state structure corresponding to the first bending in the bending forming method of multi-bending sheet metal products according to the embodiment. Figure 14 for Figure 13 Enlarged view of part D; Figure 15 This is a schematic diagram of the mold closing state structure corresponding to the first bending in the bending forming method of multi-bending sheet metal products according to the embodiment. Figure 16 This is a schematic diagram of the mold male mold closing state structure corresponding to the first bending in the bending forming method of multi-bending sheet metal products according to the embodiment; Figure 17 This is a schematic diagram of the mold opening state structure of the mold corresponding to the first bending in the bending forming method of multi-bending sheet metal products according to the embodiment. Figure 18 This is a schematic diagram of the mold opening state structure corresponding to the third bending in the bending forming method of multi-bending sheet metal products according to the embodiment. Figure 19 for Figure 18 Enlarged view of part E; Figure 20 This is a schematic diagram of the mold closing state structure corresponding to the third bending in the bending forming method of multi-bending sheet metal products according to the embodiment. Figure 21 for Figure 20 Enlarged view of part F.

[0020] Figure label: 1. First Part; 1.1. First circumferential broken line; 1.11. Horizontal segment; 1.12. Vertical straight segment; 1.13. Vertical stepped segment; 1.2. Third horizontal broken line; 1.3. Fifth vertical broken line; 1.4. Seventh vertical broken line; 1.5. Tenth vertical broken line; 1.6. Second circumferential broken line; 1.7. Fourth horizontal broken line; 1.8. Sixth vertical broken line; 1.9. Arc-shaped gap; 2. Part Two; 2.1. Eighth Vertical Line; 2.2. Ninth Vertical Line; 3. Notch; 110. Upper die base of the first mold; 120. Upper die insert of the first mold; 121. First inclined surface; 122. Second inclined surface; 130. Bending punch of the first mold; 140. First floating plate; 150. Second floating plate; 210. Lower mold base of the first mold; 220. Lower template of the first mold; 230. Sliding component; 240. Lower outer insert; 241. Third inclined surface; 250. Lower inner insert; 251. Fourth inclined surface; 260. Side-folding punch; 271. Fixed male mold; 272. Sliding male mold; 273. Slider; 274. Hook block; 275. First inclined side surface; 276. Second inclined side surface; 277. Inclined sliding guide structure; 278. First flat part; 279. Second flat part; 2710. Third inclined side surface; 2711. Fourth inclined side surface; 280. Sliding component reset assembly; 290. Mounting base; 2100. Lower inner insert reset assembly; 310. Upper die base of the third mold; 311. Fixed plate; 320. Fixed seat; 321. Guide rail; 330. Sliding insert; 331. Fifth inclined surface; 332. Guide groove; 340. Bending punch of the third mold; 350. Pressure plate; 360. Bending corner insert; 370. Lower die base of the third mold; 380. Lower die plate of the third mold; 390. Bending male mold; 3110. Lower insert of the third mold; 3111. Sixth inclined surface; 3120. Sliding insert reset component. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "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.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] In some embodiments of this application, a bending forming method for a multi-bend sheet metal product includes the following steps: S1. Perform blanking processing on the flat product to be processed. The shape of the blanked product is as follows: Figure 5As shown, it includes a first part 1 and a second part 2 arranged horizontally. The longitudinal length of the second part 2 is less than the longitudinal length of the first part 1. A notch 3 is formed between the first end of the second part 2 and the first end of the first part 1 on the same side. The first end of the first part 1 is provided with a first circumferential broken line 1.1, a third horizontal broken line 1.2, and a fifth longitudinal broken line 1.3. The first part 1 has a seventh longitudinal broken line 1.4 and a tenth longitudinal broken line 1.5 on opposite sides. The second part 2 is located on the side of the tenth longitudinal broken line 1.5 and is located outside the tenth longitudinal broken line 1.5. The first circumferential broken line 1.1 includes a horizontal segment 1.1. 1. Connecting one end of the transverse segment 1.11 with the longitudinal straight segment 1.12 and the other end of the transverse segment 1.11 with the longitudinal stepped segment 1.13; the two ends of the fifth longitudinal broken line 1.3 are respectively connected to the longitudinal straight segment 1.12 of the first circumferential broken line 1.1 and the seventh longitudinal broken line 1.4; the first end of the tenth longitudinal broken line 1.5 is connected to the longitudinal stepped segment 1.13 of the first circumferential broken line 1.1, and the second end extends towards the second end of the first part 1; the two ends of the third transverse broken line 1.2 intersect perpendicularly with the fifth longitudinal broken line 1.3 and the tenth longitudinal broken line 1.5, respectively, and do not intersect with the longitudinal stepped segment 1.13 of the first circumferential broken line 1.1, as shown. Figure 6 As shown; S2, First-order bending: The product after being blanked in step S1 is bent simultaneously along the first circumferential fold line 1.1 and the seventh longitudinal fold line 1.4, and the lateral edge of the bent part corresponding to the lateral segment 1.11 of the first circumferential fold line 1.1 is simultaneously formed with an inner buckling structure. S3, Second-order bending: Bend the product after the first-order bending in step S2 downwards along the third horizontal fold line 1.2 and the fifth vertical fold line 1.3; S4, Third-order bending: Bend the product after the second-order bending in step S3 downwards along the tenth longitudinal fold line 1.5.

[0028] In some embodiments of this application, Figure 5 Taking the perspective shown as an example, both the first part 1 and the second part 2 are roughly rectangular plates. The lower end of the first part 1 is its first end, and the upper end of the first part 1 is its second end. Similarly, the lower end of the second part 2 is its first end, and the upper end of the second part 2 is its second end. Thus, the first end of the first part 1 and the second end of the second part 2 are on the same side, and the second end of the first part 1 and the second end of the second part 2 are on the same side.

[0029] In some embodiments of this application, the same applies. Figure 5 As shown, the finished product is centered around a horizontally extending central axis. l For the axis of symmetry to be vertically symmetrical, then the first part 1 is relative to the central axis. l The upper and lower parts are symmetrical, and the second part 2 is relative to the central axis. lIf the parts are symmetrical, a notch 3 is formed between the first end of the first part 1 and the first end of the second part 2, and the same notch 3 is also formed between the second end of the first part 1 and the second end of the second part 2.

[0030] Correspondingly, at the second end of the first part 1, there are a second circumferential broken line 1.6, a fourth transverse broken line 1.7, and a sixth longitudinal broken line 1.8. The second circumferential broken line 1.6 is symmetrical to the first circumferential broken line 1.1 and also includes a transverse segment, a longitudinal straight segment connecting one end of the transverse segment, and a longitudinal stepped segment connecting the other end of the transverse segment. The fourth transverse broken line 1.7 is symmetrical to the third transverse broken line 1.2. The sixth longitudinal broken line 1.8 is symmetrical to the fifth longitudinal broken line 1.3. The two ends of the sixth longitudinal broken line 1.8 are respectively connected to the longitudinal straight segment of the second circumferential broken line 1.6 and the seventh longitudinal broken line 1.4. The second end of the tenth longitudinal broken line 1.5 is connected to the longitudinal stepped segment of the second circumferential broken line 1.6. The two ends of the fourth transverse broken line 1.7 intersect perpendicularly with the sixth longitudinal broken line 1.8 and the tenth longitudinal broken line 1.5, respectively, and do not intersect with the longitudinal stepped segment of the second circumferential broken line 1.6.

[0031] In step S2, during the first bending sequence, the blanked product is simultaneously bent along the first circumferential fold line 1.1, the second circumferential fold line 1.6, and the seventh longitudinal fold line 1.4. The lateral edge of the bent portion corresponding to the transverse segment 1.11 of the first circumferential fold line 1.1 is simultaneously formed with an inward-curving structure, and the lateral edge of the bent portion corresponding to the transverse segment of the second circumferential fold line 1.6 is also simultaneously formed with an inward-curving structure. After the first bending sequence is formed, as shown... Figure 7 and Figure 8 As shown, the bend corresponding to the first circumferential broken line 1.1 is... Figures 1 to 4 The bend corresponding to the second circumferential fold line 1.6 in the flange 'a' is... Figure 1 and Figure 3 The bend corresponding to the seventh vertical line 1.4 in the flange b is... Figure 3 , Figure 4 , Figure 8 , Figure 10 and Figure 12 The flange c in the middle, the inner buckle structure on the first circumferential fold line 1.1 is as follows: Figure 2 and Figure 4 The inner-fastening structure f in the middle, the inner-fastening structure on the second circumferential broken line 1.6 is symmetrical to the inner-fastening structure f. Due to the perspective, in Figures 1 to 4 Not shown in the image.

[0032] In step S3, the second bending step involves bending the product after the first bending step downwards along the third transverse fold line 1.2, the fourth transverse fold line 1.7, the fifth longitudinal fold line 1.3, and the sixth longitudinal fold line 1.8. The product after the second bending step is completed as follows: Figure 9 and Figure 10 As shown, the bend corresponding to the third horizontal line 1.2 is... Figures 1 to 4 The bend corresponding to the fourth horizontal fold line 1.7 in the flange d is... Figure 1 and Figure 3 The bend corresponding to the fifth vertical line 1.3 in the flange e is... Figure 3 and Figure 4 In the flange g, the bend corresponding to the sixth vertical line 1.8 is symmetrical to flange g. Due to the viewing angle, in Figures 1 to 4 Not shown in the image.

[0033] In step S4, the third bending step involves bending the product after the second bending step downwards along the tenth longitudinal fold line 1.5. The final product will then resemble... Figures 1 to 4 ,as well as Figure 11 and Figure 12 As shown, the bent portion corresponding to the tenth vertical line 1.5 is... Figures 1 to 4 as well as Figure 12 The folded edge h in the middle.

[0034] Since the bending positions at both ends of the third horizontal fold line 1.2 and the fourth horizontal fold line 1.7 require both horizontal and vertical bending, during the blanking process in step S1, arc-shaped notches 1.9 are formed at both ends of the third horizontal fold line 1.2 and the fourth horizontal fold line 1.7, as shown. Figure 6 As shown, in order to minimize material accumulation and wrinkling at the bends, the two ends of the third transverse fold line 1.2 and the fourth transverse fold line 1.7 extend to the concave point of the corresponding arc-shaped notch 1.9.

[0035] The bending and forming method for multi-bending sheet metal products adopted in the embodiments of this application can reduce the number of forming processes and molds, improve forming efficiency, reduce mold costs, and ensure bending and forming quality by reasonably selecting bending lines and bending sequences.

[0036] In some embodiments of this application, in step S1, the second part 2 of the product after unloading is further provided with an eighth longitudinal fold line 2.1 and a ninth longitudinal fold line 2.2, such as... Figure 5 As shown, the ninth vertical line 2.2 and the eighth vertical line 2.1 are arranged from the inside to the outside relative to the tenth vertical line 1.5. That is, the ninth vertical line 2.2 is located outside the tenth vertical line 1.5, and the eighth vertical line 2.1 is located outside the ninth vertical line 2.2, moving away from the tenth vertical line 1.5 in turn.

[0037] Accordingly, in the first sequential bending of step S2, the eighth longitudinal fold line 2.1 is bent synchronously with the first circumferential fold line 1.1 and the seventh longitudinal fold line 1.4, and the longitudinal edge of the bent portion corresponding to the eighth longitudinal fold line 2.1 is synchronously formed with an inward buckling structure. The bent portion corresponding to the eighth longitudinal fold line 2.1 is... Figures 1 to 4 The flange i shown corresponds to the inner buckle structure as follows: Figure 3 and Figure 4 The inward-fastening structure j is shown in the figure.

[0038] Accordingly, in the second bending step S3, the ninth longitudinal fold line 2.2 bends downwards simultaneously with the third transverse fold line 1.2 and the fifth longitudinal fold line 1.3; and a U-shaped bend m is formed between the eighth longitudinal fold line 2.1 and the ninth longitudinal fold line 2.2; after the third bending step S4 is completed, the opening direction of the U-shaped bend m is opposite to the bending direction of the inner buckling structure j on the longitudinal edge of the bending part corresponding to the eighth longitudinal fold line 2.1.

[0039] After bending and forming, the complete product structure is as follows: Figures 1 to 4 As shown, specifically the refrigerator door shell, the opening of the U-shaped bend m faces outwards, serving as the handle part of the refrigerator door shell.

[0040] In some embodiments of this application, the mold structure used for the first bending step S2 refers to... Figures 13 to 17 It includes an upper die and a lower die. To distinguish it from the die used for the third-order bending, the die corresponding to the first-order bending is defined as the first die, and its upper die and lower die are defined as the first die upper die and the first die lower die, respectively.

[0041] The first mold upper die includes a first mold upper die base 110, a first mold upper insert 120, a first mold bending punch 130, a first floating plate 140, and a second floating plate 150 located below the first floating plate 140. The first mold bending punch 130 is disposed on the first floating plate 140. The first mold upper insert 120 is fixed on the first mold upper die base 110. The bottom end of the first mold upper insert 120 has a first inclined surface 121 and a second inclined surface 122. The first inclined surface 121 and the second inclined surface 122 are arranged opposite to each other and have opposite inclination directions. The first inclined surface 121 is located outside the second inclined surface 122. The first inclined surface 121 is inclined upward and the second inclined surface 122 is inclined downward. The lowest edge of the first inclined surface 121 intersects with the lowest edge of the second inclined surface 122.

[0042] The lower die of the first mold includes a lower die base 210, a lower die template 220, a sliding component 230, an outer lower insert 240, an inner lower insert 250, a side-folding punch 260, and a male mold.

[0043] The top of the lower outer insert 240 has a third inclined surface 241, which engages with the first inclined surface 121.

[0044] The lower inner insert 250 is located inside the lower outer insert 240 and is separated from the lower outer insert 240 by a certain distance. The top of the lower inner insert 250 has a fourth inclined surface 251, which cooperates with the second inclined surface 122.

[0045] In the height direction, the third inclined surface 241 is higher than the fourth inclined surface 251, so that when the inserter 120 of the first mold moves down with the upper mold, the first inclined surface 121 first contacts the third inclined surface 241, and then the second inclined surface 122 contacts the fourth inclined surface 251.

[0046] The sliding member 230 is slidably disposed on the lower mold base 210 of the first mold. The lower inner insert 250 and the side folding punch 260 are slidably disposed together on the sliding member 230. That is, the sliding member 230 can slide on the lower mold base 210 of the first mold, and the lower inner insert 250 and the side folding punch 260 can slide on the sliding member 230 and can slide together with the sliding member 230 on the lower mold base 210 of the first mold.

[0047] The male mold includes a fixed male mold 271, a sliding male mold 272, and a slider 273. The fixed male mold 271 is fixedly mounted on the lower mold base 210 of the first mold, and the sliding male mold 272 and the lower inner insert 250 are fixedly mounted on the sliding member 230 and can slide together with the sliding member 230 on the lower mold base 210 of the first mold.

[0048] The slider 273 is configured to slide to a first position and a second position. When the sliding male mold 272 slides away from the fixed male mold 271 and into position, the slider 273 is in the first position, which closes the gap between the sliding male mold 272 and the fixed male mold 271 and participates in the first-order bending. When the slider 273 is in the second position, it avoids the sliding male mold 272 and slides closer to the fixed male mold 271, so that the sliding male mold 272 can avoid the inner buckling structure f when the mold is opened.

[0049] Because the bending of the blanked product along the first circumferential fold line 1.1 and the seventh longitudinal fold line 1.4 in the first bending sequence is a positive bending, and the lateral edge of the bending part corresponding to the lateral segment 1.11 of the first circumferential fold line 1.1 has an inner buckle structure f that needs to be laterally bent, the male mold needs to make way for the laterally bent inner buckle structure f when it is opened after the forming is completed. Therefore, by setting the male mold as a splicing structure including a fixed male mold 271, a sliding male mold 272 and a slider 273, the sliding part 230 is driven to slide by the cooperation of the upper insert 120 and the lower outer insert 240 of the first mold during the mold closing process, thereby driving the sliding male mold 272 to slide, so that it can switch between the forming position and the position of avoiding the inner buckle.

[0050] By setting the slider 273, it can slide to the first position when the sliding male mold 272 slides to the forming position, close the gap between the sliding male mold 272 and the fixed male mold 271, and participate in the first-order bending, so that the male mold becomes a closed and complete male mold, preventing the corresponding part of the product from collapsing or other defects when the product is formed at this position due to the splicing gap between the sliding male mold 272 and the fixed male mold 271.

[0051] The slider 273 can also slide to the second position. In the second position, it avoids the sliding male mold 272 sliding closer to the fixed male mold 271, so that the sliding male mold 272 can avoid the inner buckling structure f when the mold is opened.

[0052] In some embodiments of this application, the sliding male mold 272 corresponds to the horizontal arrangement of the product, the fixed male mold 271 corresponds to the vertical arrangement of the product, and the sliding male mold 272 slides along the vertical direction.

[0053] by Figure 13 and Figure 14 Taking the shown perspective as an example, during the mold closing process, the upper mold of the first mold moves downward, driving the upper insert 120 of the first mold to move downward. The second floating plate 150 first contacts and presses down on the product. When the lower mold moves down to the point where the first inclined surface 121 of the upper insert 120 of the first mold contacts and engages with the third inclined surface 241 of the lower outer insert 240, as the upper insert 120 of the first mold continues to move downward, the upper insert 120 of the first mold, through its engagement with the inclined surface of the lower outer insert 240, pushes the lower outer insert 240, causing the sliding component 230 to slide outward (i.e., Figure 13 and Figure 4 (From center to right), which in turn drives the sliding male mold 272 to slide away from the fixed male mold 271 to the forming position, while the slider 273 slides to the first position, the corresponding sliding direction is as follows: Figure 16 As shown by the arrow, the gap between the closed sliding male mold 272 and the fixed male mold 271 is closed, and the positive bending of the bending part corresponding to the seventh longitudinal fold line 1.4 in the first sequence bending is participated in.

[0054] As the upper die of the first mold continues to descend, the upper insert 120 of the first mold also continues to descend. The first inclined surface 121 disengages from the third inclined surface 241, the sliding component 230 stops sliding, and the first floating plate 140 contacts and presses against the product. The second inclined surface 122 of the upper insert 120 of the first mold gradually contacts and engages with the fourth inclined surface 251 of the lower inner insert 250. As the upper insert 120 of the first mold continues to descend, it pushes the side folding punch 260 to slide inward through its engagement with the inclined surface of the lower inner insert 250 (i.e., Figure 13 and Figure 4 (From the center to the left, closer to the product), to achieve a side fold, forming the inner buckling structure f on the transverse edge of the first circumferential fold line 1.1 in the first sequence of bending.

[0055] During mold opening, slider 273 slides to the second position. In the second position, it avoids sliding male mold 272 and slides closer to fixed male mold 271, such as... Figure 17 As shown, during mold opening, the sliding male mold 272 can avoid the inner clip structure f. The sliding directions of the sliding male mold 272 and the slider 273 are as follows: Figure 17 The corresponding arrow is shown in the image.

[0056] In some embodiments of this application, such as Figure 16 and Figure 17 As shown, slider 273 is located between sliding male mold 272 and fixed male mold 271. A hook block 274 is provided on the inner side of sliding male mold 272 (the side facing the fixed male mold 271). The hook block 274 and slider 273 have a hooking surface n for hooking engagement. During mold closing, with the cooperation of the upper insert 120 and the lower outer insert 240 of the first mold, the sliding male mold 272 is pushed away from the fixed male mold 271, causing the hook block 274 to move in the same direction. The hook block 274 hooks onto slider 273, thus pushing slider 273 to the first position, as shown. Figure 16 As shown. During mold opening, the sliding male mold 272 slides closer to the fixed male mold 271, and pushes the slider 273 to slide to the second position, as shown. Figure 17 As shown, the sliding of slider 273 is driven by sliding male mold 272, eliminating the need for additional sliding drive structures, which simplifies the mold structure and reduces mold costs.

[0057] In some embodiments of this application, the hook block 274 is J-shaped, with one end embedded in the sliding male mold 272 and fixedly connected to the sliding male mold 272, and the other end corresponding to the hook portion of the J-shape, serving as the hook end.

[0058] In some embodiments of this application, the same applies. Figure 16 and Figure 17 As shown, the fixed male mold 271 has a first inclined side surface 275 facing the side where the sliding male mold 272 is located. The first inclined side surface 275 forms an acute angle with the inner side surface of the sliding male mold 272. The slider 273 has a second inclined side surface 276 that matches the first inclined side surface 275. The first inclined side surface 275 and the second inclined side surface 276 have mutually cooperating oblique sliding guide structures 277, which guide and limit the sliding switching of the slider 273 between the first position and the second position, ensuring its positional accuracy and improving the product molding quality. At the same time, the slider 273 slides with the fixed male mold 271 in the inclined direction, which can conveniently use the sliding of the sliding male mold 272 as the sliding drive source of the slider 273. This simplifies the structure, shortens the sliding stroke, reduces the volume of the slider 273, and thus reduces the size of the joint between the fixed male mold 271 and the sliding male mold 272, which is beneficial to improving the product molding quality.

[0059] In some embodiments of this application, the oblique sliding guide structure 277 is a dovetail groove and a dovetail block mating structure. Of course, it can also be other forms of linear guide structure, and no specific limitation is made here.

[0060] In some embodiments of this application, the inner surface of the sliding male mold 272 has a first flat portion 278, and the slider 273 has a corresponding second flat portion 279. During the sliding process of the slider 273 with the sliding male mold 272, the first flat portion 278 and the second flat portion 279 are always in contact. The first flat portion 278 and the second flat portion 279 are perpendicular to the sliding direction of the sliding male mold 272. At the same time, the second inclined side 276 of the slider 273 and the first inclined side 275 of the fixed male mold 271 are also always in contact, which helps to ensure the integrity of the male mold and meet the strength requirements.

[0061] In some embodiments of this application, a third inclined side surface 2710 is formed on the sliding male mold 272 facing the slider 273, and a fourth inclined side surface 2711 matching the third inclined side surface 2710 is formed on the slider 273. The fourth inclined side surface 2711 has the same inclination direction as the second inclined side surface 276.

[0062] Specifically, the third inclined side 2710 is connected to the first flat part 278 at an obtuse angle, and the fourth inclined side 2711 is connected to the second flat part 279 at an obtuse angle. When the slider 273 is in the second position, in addition to the first flat part 278 abutting against the second flat part 279 and the second inclined side 276 abutting against the first inclined side 275, the third inclined side 2710 also abutting against the fourth inclined side 2711, which plays an auxiliary limiting role in the sliding of the slider 273 to the second position, ensuring that the sliding position of the slider 273 is accurate.

[0063] In some embodiments of this application, a sliding member reset assembly 280 is provided on the lower mold base 210 of the first mold, which provides a reset spring force to the sliding member 230 when the mold is opened. When the upper insert 120 of the first mold is disengaged from the lower outer insert 240, the sliding member 230 is reset to its original position.

[0064] A wear-resistant plate is provided between the sliding component 230 and the lower mold base 210 of the first mold to reduce sliding wear.

[0065] In some embodiments of this application, such as Figure 14 As shown, the side-folding punch 260 is integrated on the lower inner insert 250, and is located on opposite sides of the top of the lower inner insert 250, with the fourth inclined surface 251 on the outside and the side-folding punch 260 on the inside. The side-folding punch 260 is rectangular in shape. The lower inner insert 250 slides in cooperation with the sliding member 230, thereby driving the side-folding punch 260 to slide. The top surface of the sliding member 230 is also provided with a wear-resistant plate, and the lower inner insert 250 slides on the wear-resistant plate to reduce sliding wear.

[0066] The lower inner insert 250 is located between the lower outer insert 240 and the sliding male mold 272. The sliding male mold 272 is fixed on the sliding member 230 by the mounting base 290. The mounting base 290 is equipped with a lower inner insert 250 reset assembly, which provides a reset spring force to the lower inner insert 250 when the mold is opened. When the upper insert of the second mold is disengaged from the lower inner insert 250, the lower inner insert 250 is reset into place.

[0067] In some embodiments of this application, the first circumferential fold line 1.1 and the second circumferential fold line 1.6 at both ends of the first part 1 of the blanked product are both bent forward and bent sideways. Then, the upper insert knife 120, the sliding part 230, the lower outer insert knife 240, the lower inner insert knife 250, the side bending punch 260, and the sliding male mold 272 of the first mold are set one-to-one with the two ends of the first part 1 of the blanked product, and the bending of the two ends of the first part 1 is realized simultaneously.

[0068] In some embodiments of this application, the mold used for the second bending step S3 can be any existing conventional bending mold, and no specific restrictions are imposed here.

[0069] In some embodiments of this application, the die structure used in step S4, the third bending step, refers to... Figures 18 to 21 It includes an upper die and a lower die. To distinguish it from the die used for the first bending, the die corresponding to the third bending is defined as the third die, and its upper die and lower die are defined as the upper die of the third die and the lower die of the third die, respectively.

[0070] The third mold upper die includes a third mold upper die base 310, a third mold upper insert, a third mold bending punch 340, a pressure plate 350, and a bending corner insert 360. The third mold upper insert includes a fixed base 320 and a sliding insert 330. The fixed base 320 is fixed to the third mold upper die base 310, and the sliding insert 330 is slidably disposed below the fixed base 320. The sliding direction of the sliding insert 330 is parallel to the extension direction of the tenth longitudinal fold line 1.5. The outer side of the bottom end of the sliding insert 330 has a fifth inclined surface 331. The bending corner insert 360 is disposed on the inner side of the bottom end of the sliding insert 330, corresponding to the connection point of the first end of the tenth longitudinal fold line 1.5 and the longitudinal step segment 1.13 of the first circumferential fold line 1.1, that is, corresponding to... Figure 6 The arc-shaped notch 1.9 shown.

[0071] The lower die of the third mold includes a lower die base 370, a lower die template 380, a bending die 390, and a lower die insert 3110. The lower die insert 3110 has a sixth inclined surface 3111 that cooperates with the fifth inclined surface 331.

[0072] The bending corner insert 360 and the third mold bending punch 340 are configured such that the bending corner insert 360 first cooperates with the bending male mold 390 for bending, and then the third mold bending punch 340 cooperates with the bending male mold 390 for bending. The parts of the third mold bending punch 340 and the bending male mold 390 that cooperate with each other, as well as the parts of the bending corner insert 360 and the bending male mold 390 that cooperate with each other, have overlapping areas.

[0073] Specifically, the height of the bending corner insert 360 is lower than the height of the bending punch 340 of the third mold, so that when the mold is closed, the bending corner insert 360 can first contact the part of the bending male mold 390 that is formed with it. After the bending corner insert 360 is formed, the bending punch 340 of the third mold then forms with the bending male mold 390.

[0074] During mold closing, the upper mold of the third mold descends, and the pressure plate 350 contacts the product placed on the lower mold plate 380 of the third mold and fixes the product. The mold continues to descend, and the fifth inclined surface 331 of the sliding insert 330 contacts and engages with the sixth inclined surface 3111 of the lower insert 3110 of the third mold. As the mold continues to descend and the fifth and sixth inclined surfaces 331 and 3111 engage, the sliding insert 330 drives the bending corner insert 360 downwards while simultaneously moving laterally towards the side where the bending male mold 390 is located, forming an oblique angle relative to the product (e.g., ...). Figure 19 (As shown by arrow I) Bending and shaping to complete the connection between the first end of the tenth longitudinal fold line 1.5 and the longitudinal stepped segment 1.13 of the first circumferential fold line 1.1, that is... Figure 6 The bending and forming of the arc-shaped notch 1.9 shown.

[0075] The die continues to descend, and the third die bending punch 340 and bending die 390 work together to complete the positive bending of the longitudinal long side corresponding to the tenth longitudinal fold line 1.5. The bending direction of the third die bending punch 340 on the product is as follows: Figure 19 As indicated by arrow II, the third mold is in the closed state as follows. Figure 20 and Figure 21 As shown.

[0076] The parts where the bending punch and bending die 390 mate in the third mold overlap, and the parts where the bending corner insert 360 mates with the bending die 390 mate, have overlapping areas. Therefore, when the bending punch and bending die 390 mate in the third mold are forming, the parts where the bending corner insert 360 mates with the bending die 390 mate can be repeatedly formed. This avoids incomplete bending at the connection between the tenth longitudinal fold line 1.5 and the first circumferential fold line 1.1, and improves the L-shaped edge wrapping k (i.e.,...) at the intersection of the longitudinal and transverse bends on the side of the product. Figure 4 The forming accuracy and forming quality of the intersection of the middle flange a and the flange h.

[0077] In some embodiments of this application, a sliding guide structure is formed between the sliding insert 330 and the fixed base 320 to guide the sliding of the sliding insert 330, so that its operation is smooth and reliable, thereby making the bending corner insert 360 operate smoothly and reliably.

[0078] Specifically, a guide rail 321 is formed on the fixed base 320, and a corresponding guide groove 332 is formed on the sliding insert 330. The guide rail 321 and the guide groove 332 slide and guide each other.

[0079] The guide rail 321 can be a T-shaped or dovetail-shaped guide rail to prevent the sliding inserter 330 from falling.

[0080] In some embodiments of this application, a sliding insert reset component 3120 is formed between the sliding insert 330 and the fixed base 320 for driving the sliding insert 330 to slide and reset when the mold is opened.

[0081] Specifically, with Figure 18 and Figure 19 Taking the perspective shown as an example, a fixed plate 311 located outside the upper die holder of the third mold is fixed on the upper die holder 310 of the third mold. The sliding die reset component 3120 is installed on the fixed plate 311 and can be a reset spring assembly. When the mold moves down to close the mold, during the process of the sliding die 330 and the lower die holder 3110 of the third mold engaging with the inclined surface, the lower die holder 3110 of the third mold pushes the sliding die 330 to move laterally to the left, causing the sliding die reset component 330 to undergo elastic deformation and continuously store energy. When the mold opens, after the sliding die 330 moves up to disengage from the lower die holder 3110 of the third mold, the sliding die reset component 3120 drives the sliding die 330 to reset to the position.

[0082] In some embodiments of this application, the bending corner insert 360 is detachably installed on the sliding insert 330, so that the bending corner insert 360 of different sizes can be replaced according to the different thicknesses of the corresponding forming parts on the product, and the gap between it and the bending die 390 can be changed to adapt to products of different thicknesses to be formed.

[0083] For example Figure 1 and Figure 3 As shown, the product has L-shaped edging k where both ends of the product have longitudinal and transverse bends intersecting. In some embodiments of this application, the upper insert of the third mold, the bending corner insert 360, and the lower insert of the third mold are set one-to-one with the two ends of the product, and the bending corner inserts 360 at both ends simultaneously bend the corresponding parts at both ends of the product.

[0084] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0085] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A bending forming method for multi-bending sheet metal products, characterized in that, Includes the following steps: S1. A flat product to be processed is blanked. The blanked product includes a first part and a second part arranged in a transverse direction. The longitudinal length of the second part is less than that of the first part. At least a notch is formed between the first end of the second part and the first end of the first part on the same side. The first end of the first part is provided with a first circumferential fold line, a third transverse fold line, and a fifth longitudinal fold line. The opposite sides of the first part are provided with a seventh longitudinal fold line and a tenth longitudinal fold line. The second part is located on the side of the tenth longitudinal fold line and outside the tenth longitudinal fold line. The first circumferential fold line includes a transverse segment, a longitudinal straight segment connecting one end of the transverse segment, and a longitudinal stepped segment connecting the other end of the transverse segment. The two ends of the fifth longitudinal fold line are respectively connected to the longitudinal straight segment of the first circumferential fold line and the seventh longitudinal fold line. The first end of the tenth longitudinal fold line is connected to the longitudinal stepped segment of the first circumferential fold line, and the second end extends to the second end of the first part. The two ends of the third transverse fold line intersect the fifth longitudinal fold line and the tenth longitudinal fold line perpendicularly, and do not intersect the longitudinal stepped segment of the first circumferential fold line. S2, First-order bending: The blanked product is bent simultaneously along the first circumferential fold line and the seventh longitudinal fold line, and the lateral edge of the bending part corresponding to the lateral segment of the first circumferential fold line is simultaneously formed with an inner buckling structure. S3, Second bending: Bend the product after the first bending downwards along the third horizontal fold line and the fifth vertical fold line; S4. Third bending: Bend the product after the second bending downwards along the tenth longitudinal fold line.

2. The bending and forming method for multi-bending sheet metal products according to claim 1, characterized in that, In step S1, the second part is further provided with an eighth longitudinal broken line and a ninth longitudinal broken line, the ninth longitudinal broken line and the eighth longitudinal broken line being arranged from the inside to the outside relative to the tenth longitudinal broken line; In step S2, the eighth longitudinal fold line is bent synchronously with the first circumferential fold line and the seventh longitudinal fold line, and the longitudinal edge of the bent portion corresponding to the eighth longitudinal fold line is synchronously formed with an inward buckling structure. In step S3, the second bending process involves the ninth longitudinal fold line bending downwards simultaneously with the third transverse fold line and the fifth longitudinal fold line; and a U-shaped bend is formed between the eighth longitudinal fold line and the ninth longitudinal fold line. Furthermore, after the third bending in step S4 is completed, the opening direction of the U-shaped bend is opposite to the bending direction of the inner buckling structure on the longitudinal edge of the bending portion corresponding to the eighth longitudinal fold line.

3. The bending and forming method for multi-bending sheet metal products according to claim 1, characterized in that, The first die used in step S2, the first bending step, includes: The first mold upper mold includes a first mold upper mold base, a first mold upper insert, a first mold bending punch, a first floating plate and a second floating plate located below the first floating plate. The first mold bending punch is disposed on the first floating plate, and the first mold upper insert is fixed on the first mold upper mold base. The bottom end of the first mold upper insert has a first inclined surface and a second inclined surface. The first mold lower die includes a first mold lower die base, a first mold lower template, a sliding member, a lower outer insert, a lower inner insert, a side-folding punch, and a male die. The lower outer insert has a third inclined surface that mates with a first inclined surface, and the lower inner insert has a fourth inclined surface that mates with a second inclined surface. The sliding member is slidably mounted on the first mold lower die base, and the lower inner insert and the side-folding punch are slidably mounted on the sliding member. The male die includes a fixed male die, a sliding male die, and a slider. The fixed male die is fixedly mounted on the first mold lower die base, and the sliding male die and the lower outer insert are fixedly mounted on the sliding member. The slider is configured to slide to a first position and a second position. When the sliding male die slides away from the fixed male die to its position, the slider is in the first position, which closes the gap between the sliding male die and the fixed male die and participates in the first-order bending. When the slider is in the second position, it avoids the sliding male die and slides closer to the fixed male die, so that the sliding male die can avoid the inner buckling structure when the mold is opened.

4. The bending and forming method for multi-bending sheet metal products according to claim 3, characterized in that, The slider is located between the sliding male mold and the fixed male mold. The inner side of the sliding male mold is provided with a hook block. When the mold is closed, the sliding male mold slides away from the fixed male mold and pushes the slider to the first position through the hook block. When the mold is opened, the sliding male mold slides closer to the fixed male mold and pushes the slider to the second position.

5. The bending and forming method for multi-bending sheet metal products according to claim 4, characterized in that, The fixed male mold has a first inclined side facing the sliding male mold, and the slider has a second inclined side that matches the first inclined side. The first inclined side and the second inclined side have mutually cooperating oblique sliding guide structures.

6. The bending and forming method for multi-bending sheet metal products according to claim 5, characterized in that, The sliding male mold and the slider abut against each other with a plane, and the plane is perpendicular to the sliding direction of the sliding male mold.

7. The bending and forming method for multi-bending sheet metal products according to claim 1, characterized in that, The third die used in step S4, the third-order bending, includes: The third mold upper die includes a third mold upper die base, a third mold upper insert, a third mold bending punch, a pressure plate, and a bending corner insert. The third mold upper insert includes a fixed base and a sliding insert. The fixed base is fixed to the third mold upper die base, and the sliding insert is slidably disposed below the fixed base. Its sliding direction is parallel to the extension direction of the tenth longitudinal fold line. The bottom outer side of the sliding insert has a fifth inclined surface. The bending corner insert is disposed on the bottom inner side of the sliding insert and corresponds to the connection between the first end of the tenth longitudinal fold line and the longitudinal step segment of the first circumferential fold line. The third mold lower die includes a third mold lower die base, a third mold lower template, a bending male die, and a third mold lower insert, wherein the third mold lower insert has a sixth inclined surface that cooperates with the fifth inclined surface; The bending corner insert and the third mold bending punch are configured such that: the bending corner insert first cooperates with the bending male mold for bending, and the third mold bending punch then cooperates with the bending male mold for bending, and the parts of the third mold bending punch that cooperate with the bending male mold and the parts of the bending corner insert that cooperate with the bending male mold have overlapping areas.

8. The bending and forming method for multi-bending sheet metal products according to claim 7, characterized in that, A sliding guide structure is formed between the sliding insert and the fixed base.

9. The bending and forming method for multi-bending sheet metal products according to claim 7, characterized in that, A sliding insert reset component is formed between the sliding insert and the fixed base, which is used to drive the sliding insert to slide and reset when the mold is opened.

10. The bending and forming method for multi-bending sheet metal products according to claim 7, characterized in that, The bent corner insert is detachably mounted on the sliding insert.

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