Molding method of sectional material structure shaped like Chinese character'mu '

Abstract

A forming method of a sectional material structure shaped like a Chinese character'mu 'specifically comprises the following steps that S1, a concave structure with a downward notch is gradually formed in the left side position of a material belt through a first roller set, and meanwhile a cover piece structure with the width twice that of the concave structure is gradually formed in the right side position of the material belt; s2, the second roller set enables the concave structure to turn over towards the middle of the material belt till the bottom wall of the concave structure is attached to the middle of the material belt; s3, the bottom wall of the concave structure is welded to the middle of the material belt through a first welding machine; s4, enabling the cover plate structure to overturn towards the middle part of the material belt by a third roller group until the first welding part is in contact with the middle part of the cover plate structure; and S5, the material belt is conveyed to a second welding machine, and the second welding machine welds the first welding part and the middle of the cover plate structure and meanwhile welds the second welding part and the left wall of the concave structure turned over in the step S2. According to the scheme, the machining steps are simplified, the machining difficulty is reduced, and the machined profile is good in strength consistency and high in quality stability.

Description

Technical Field

[0001] The present invention relates to the technical field of profile processing, and more particularly to a forming method for a square-eye-shaped profile structure. Background Art

[0002] In recent years, with the development of society, the problems of limited oil resources and environmental pollution have become increasingly prominent, which has made new energy vehicles more and more attention-grabbing in society. Existing new energy vehicles require multiple batteries to provide kinetic energy. In order to minimize the weight of the battery pack, a battery pack frame with a relatively light weight and strong rigidity and compressive strength is needed for support.

[0003] Referring to the published patent with the application number CN202311856810.2, this patent proposes a profile with a "square-eye" structure and a corresponding composite roll forming method. In the solution of this patent, it is necessary to first roll a first strip-shaped raw material into a square-shaped structure through a first roll forming station, then transport the first strip-shaped raw material of the square-shaped structure to the center of the second strip-shaped raw material and weld them, and finally roll the second strip-shaped raw material into a cross-sectional shape corresponding to the first formed body through a second roll forming station and weld it to form a profile with a "square-eye" structure.

[0004] Obviously, on the one hand, the above composite roll forming method requires the composite processing of two strip-shaped raw materials, that is, it is necessary to wait for the first strip-shaped raw material to be rolled into a square-shaped structure before it can be transferred and welded to the second strip-shaped raw material, and then the second strip-shaped raw material can be rolled and welded. The operation is cumbersome and the processing difficulty is large. On the other hand, in the above composite roll forming method, the two sides of the second strip-shaped raw material are respectively welded to the two sides of the first strip-shaped raw material of the square-shaped structure after being rolled and deformed. Therefore, the welding quality of the two sides of the second strip-shaped raw material directly affects the structural strength of the two sides of the finally formed profile with a "square-eye" structure. If there are problems with the welding quality on either side, it will lead to poor strength consistency and unstable quality of the finally formed profile with a "square-eye" structure. Summary of the Invention

[0005] The object of the present invention is to solve the problems that the roll forming method of the profile with a "square-eye" structure in the prior art is cumbersome in operation and difficult in processing on the one hand, and on the other hand, the strength consistency of the finally formed profile with a "square-eye" structure is poor and the quality is unstable.

[0006] To solve the above problems, the present invention provides a forming method for a square-eye-shaped profile structure, which is sequentially provided with a first roller group, a second roller group, a first welding machine, a third roller group and a second welding machine along the traveling direction of the strip; specifically including the following steps:

[0007] S1. Feed the flat strip to the first roller group. Multiple rollers of the first roller group perform the first-round rolling on the strip, so that a concave structure with a downward concave notch gradually forms at the left position of the strip, and the lower end of the left wall of the concave structure bends leftward to form a first welding joint. At the same time, a cover plate structure with a width twice that of the concave structure gradually forms at the right position of the strip, and the right end of the cover plate structure bends upward to form a second welding joint.

[0008] S2. Feed the strip to the second roller group. Multiple rollers of the second roller group perform the second-round rolling on the strip, so that the concave structure flips towards the middle of the strip until the bottom wall of the concave structure fits against the middle of the strip. At this time, the position of the strip on the left side of the concave structure encloses to form a first square structure, and at the same time, the cover plate structure bends upward relative to the middle of the strip.

[0009] S3. Feed the strip to the first welding machine. The first welding machine welds the bottom wall of the concave structure to the middle of the strip.

[0010] S4. Feed the strip to the third roller group. Multiple rollers of the third roller group perform the third-round rolling on the strip, so that the cover plate structure flips towards the middle of the strip until the first welding joint contacts the middle of the cover plate structure, and the second welding joint of the cover plate structure contacts the left wall of the concave structure after flipping in S2. At this time, the concave notch of the concave structure and the cover plate structure enclose to form a second square structure, and the position of the strip on the right side of the concave structure encloses to form a third square structure.

[0011] S5. Feed the strip to the second welding machine. The second welding machine welds the first welding joint and the middle of the cover plate structure, and at the same time welds the second welding joint and the left wall of the concave structure after flipping in S2.

[0012] Compared with the prior art, the above solution optimizes the rolling and forming process of the strip. On the one hand, only one strip is required to form a "mu" - shaped structure through the rolling of the first roller group, the second roller group, and the third roller group, greatly simplifying the processing steps and reducing the processing difficulty. On the other hand, the upper right corner position of the first square structure is the strip itself, and then the strength of the upper right corner position of the first square structure is improved by welding the second welding joint and the left wall of the concave structure after flipping in S2. The upper walls of the second square structure and the third square structure are an integral cover plate structure, that is, the upper left corner position of the third square structure also belongs to the strip itself, and then the strength of the upper left corner position of the third square structure is improved by welding the first welding joint and the middle of the cover plate structure. Therefore, the first square structure and the third square structure in this solution have higher structural strength, good strength consistency, and high quality stability, effectively solving the problems in the prior art such as inconsistent welding quality on both sides of the "mu" - shaped profile, resulting in poor strength consistency and unstable quality.

[0013] In an improved solution, it further includes a fourth roller group located on the output side of the second welding machine. In step S5, the fourth roller group is used to perform a fourth-round rolling on the strip output by the second welding machine to achieve straightening of the strip, so that the cross-section of the strip further approaches the "eye" shape, ensuring better cross-section quality of the finally produced profile.

[0014] In an improved solution, the widths of the first square structure, the second square structure, and the third square structure are equal, so that the load-bearing capacity at each position of the profile is more uniform.

[0015] In an improved solution, both the first welding machine and the second welding machine are laser welding machines.

[0016] In an improved solution, the material of the strip is ultra-high-strength steel with a yield strength ≥ 1000 Mpa, a tensile strength ≥ 1200 Mpa, and an elongation after fracture ≥ 9%. Description of the Drawings

[0017] Figure 1 It is a thumbnail of the processing production line for a forming method of an eye-shaped profile structure;

[0018] Figure 2 It is a schematic diagram of the rolling process for a forming method of an eye-shaped profile structure;

[0019] Figure 3 It is a schematic diagram of the processing process for an eye-shaped profile structure Figure 1 ;

[0020] Figure 4 It is a schematic diagram of the processing process for an eye-shaped profile structure Figure 2 ;

[0021] Figure 5 It is a reference diagram for the strength analysis of an aluminum alloy profile;

[0022] Figure 6 It is a reference diagram for the strength analysis of a day-shaped profile;

[0023] Figure 7 It is a reference diagram for the strength analysis of the eye-shaped profile of the present invention;

[0024] Figure 8 It is a reference diagram for the stiffness analysis of an aluminum alloy profile;

[0025] Fig. 9 It is a reference diagram for the stiffness analysis of a day-shaped profile;

[0026] Fig.10 It is a reference diagram for the stiffness analysis of the eye-shaped profile of the present invention.

[0027] Description of the Reference Numerals

[0028] b1, first roller group; b2, second roller group; b3, first welding machine; b4, third roller group; b5, second welding machine; b6, fourth roller group; b7, material rack;

[0029] 1. Material strip; 11. First frame structure; 12. Second frame structure; 13. Third frame structure; 2. Concave structure; 21. First welding part; 3. Cover plate structure; 31. Second welding part. DETAILED DESCRIPTION

[0030] It should be understood by those skilled in the art that the following embodiments are only used to explain the technical principles of the embodiments of the present application and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art may adjust them as needed to adapt to specific application scenarios.

[0031] In the description of the following embodiments, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0032] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] See also Figure 1-Figure 4 Embodiment 1 of the present invention provides a method for forming a U-shaped profile structure, wherein a first roller group b1, a second roller group b2, a first welding machine b3, a third roller group b4 and a second welding machine b5 are sequentially arranged along the traveling direction of a material belt 1; specifically, the following steps are included:

[0035] S1, conveying the flat material strip 1 to the first roller group b1, and the multiple rollers of the first roller group b1 perform the first round of rolling on the material strip 1, so that the left side of the material strip 1 gradually forms a concave structure 2 with the notch facing downward, and the lower end of the left wall of the concave structure 2 is bent to the left to form a first welding portion 21, and at the same time, the right side of the material strip 1 gradually forms a cover structure 3 with a width twice that of the concave structure 2, and the right end of the cover structure 3 is bent upward to form a second welding portion 31;

[0036] S2, conveying the material strip 1 to the second roller group b2, and the multiple rollers of the second roller group b2 perform a second round of rolling on the material strip 1, so that the concave structure 2 is turned toward the middle of the material strip 1 until the bottom wall of the concave structure 2 is attached to the middle of the material strip 1. At this time, the position of the material strip 1 on the left side of the concave structure 2 encloses the first frame structure 11, and the cover structure 3 is bent upward relative to the middle of the material strip 1;

[0037] S3, conveying the material strip 1 to the first welding machine b3, and the first welding machine b3 welds the bottom wall of the concave structure 2 to the middle of the material strip 1;

[0038] S4, conveying the material strip 1 to the third roller group b4, and the multiple rollers of the third roller group b4 perform a third round of rolling on the material strip 1, so that the cover sheet structure 3 is turned toward the middle of the material strip 1 until the first welding portion 21 contacts the middle of the cover sheet structure 3, and the second welding portion 31 of the cover sheet structure 3 contacts the left wall of the concave structure 2 after being turned over in S2, at this time, the notch of the concave structure 2 and the cover sheet structure 3 are enclosed to form a second frame structure 12, and the position of the material strip 1 on the right side of the concave structure 2 is enclosed to form a third frame structure 13;

[0039] S5, conveying the material strip 1 to the second welding machine b5, the second welding machine b5 welds the first welding portion 21 and the middle portion of the cover plate structure 3, and simultaneously welds the second welding portion 31 and the left wall of the concave structure 2 after being turned over in S2.

[0040] Figure 2 Schematic diagram of a rolling process of a forming method of a U-shaped profile structure, wherein the upper left position is the initial state of the material strip 1, and the lower right position is the final state; Figure 3 Schematic diagram of the processing process of a mesh-shaped profile structure Figure 1 At this time, the cover sheet structure 3 has not yet been completely turned over to the point where the first welding portion 21 contacts the middle of the cover sheet structure 3; Figure 4 Schematic diagram of the processing process of a mesh-shaped profile structure Figure 2 At this time, the cover plate structure 3 has been completely turned over until the first welding portion 21 contacts the middle of the cover plate structure 3 .

[0041] The above solution optimizes the roll forming process of the strip 1. On the one hand, only one strip 1 is required to form a "mesh" structure through the rolling of the first roller group b1, the second roller group b2, and the third roller group b4, greatly simplifying the processing steps and reducing the processing difficulty. On the other hand, the upper right corner position of the first square structure 11 is the strip 1 itself, and then the strength of the upper right corner position of the first square structure 11 is improved by welding the second welding part 31 and the left wall of the concave structure 2 after being flipped in S2. The upper walls of the second square structure 12 and the third square structure 13 are an integrated cover plate structure 3, that is, the upper left corner position of the third square structure 13 also belongs to the strip 1 itself, and then the strength of the upper left corner position of the third square structure 13 is improved by welding the first welding part 21 and the middle part of the cover plate structure 3. Therefore, the first square structure 11 and the third square structure 13 of this solution have higher structural strength, good strength consistency, and high quality stability, effectively solving the problems in the prior art such as inconsistent welding quality on both sides of the "mesh" structure profile, resulting in poor strength consistency and unstable quality.

[0042] In this embodiment, the widths of the first square structure 11, the second square structure 12, and the third square structure 13 are equal, so that the load that can be borne at each position of the profile is more uniform.

[0043] Both the first welding machine b3 and the second welding machine b5 are preferably laser welding machines, with more convenient welding operations and high processing efficiency.

[0044] The material of the strip 1 is preferably ultra-high strength steel with a yield strength ≥ 1000 Mpa, a tensile strength ≥ 1200 Mpa, and an elongation after fracture ≥ 9%. Of course, the material of the strip 1 can also be replaced with aluminum alloy or other materials.

[0045] After actual tests, refer to Figure 5-7 , which are the strength analysis diagrams of the aluminum alloy profile, the "day" - shaped profile, and the "mesh" - shaped profile of the present invention; refer to Figure 8-Figure 10 , which are the stiffness analysis diagrams of the aluminum alloy profile, the "day" - shaped profile, and the "mesh" - shaped profile of the present invention. It can be seen that whether in terms of strength or stiffness, the "mesh" - shaped profile of the present invention is stronger than the aluminum alloy profile and the "day" - shaped profile. In addition, the strength - to - weight ratio of the "mesh" - shaped profile structure in this Embodiment 2 has been significantly improved compared with the conventional aluminum alloy or "day" - shaped steel profile. The specific data is shown in the following table:

[0046]

[0047] Please refer to Figure 1-Figure 4, Embodiment 2 of the present invention provides a forming method for a grid-shaped profile structure. Along the traveling direction of the strip 1, there are successively arranged a material rack b7, a first roller group b1, a second roller group b2, a first welding machine b3, a third roller group b4, a second welding machine b5, and a fourth roller group b6; specifically including the following steps:

[0048] S1. The coiled strip 1 is unrolled to a flat state by the material rack b7 and then conveyed to the first roller group b1. Multiple rollers of the first roller group b1 perform the first-round rolling on the strip 1, so that a concave structure 2 with a downward concave opening is gradually formed at the left position of the strip 1, and the lower end of the left wall of the concave structure 2 is bent leftward to form a first welding joint 21. At the same time, a cover plate structure 3 with a width twice that of the concave structure 2 is gradually formed at the right position of the strip 1, and the right end of the cover plate structure 3 is bent upward to form a second welding joint 31;

[0049] S2. The strip 1 is conveyed to the second roller group b2. Multiple rollers of the second roller group b2 perform the second-round rolling on the strip 1, so that the concave structure 2 is flipped towards the middle of the strip 1 until the bottom wall of the concave structure 2 fits against the middle of the strip 1. At this time, a first square structure 11 is formed by enclosing the position of the strip 1 on the left side of the concave structure 2, and the cover plate structure 3 is bent upward relative to the middle of the strip 1;

[0050] S3. The strip 1 is conveyed to the first welding machine b3, and the first welding machine b3 welds the bottom wall of the concave structure 2 to the middle of the strip 1;

[0051] S4. The strip 1 is conveyed to the third roller group b4. Multiple rollers of the third roller group b4 perform the third-round rolling on the strip 1, so that the cover plate structure 3 is flipped towards the middle of the strip 1 until the first welding joint 21 contacts the middle of the cover plate structure 3, and the second welding joint 31 of the cover plate structure 3 contacts the left wall of the concave structure 2 after being flipped in S2. At this time, a second square structure 12 is formed by enclosing the concave opening of the concave structure 2 and the cover plate structure 3, and a third square structure 13 is formed by enclosing the position of the strip 1 on the right side of the concave structure 2;

[0052] S5. The strip 1 is conveyed to the second welding machine b5. The second welding machine b5 welds the first welding joint 21 and the middle of the cover plate structure 3, and at the same time welds the second welding joint 31 and the left wall of the concave structure 2 after being flipped in S2. The strip 1 welded by the second welding machine b5 is conveyed to the fourth roller group b6, and the fourth roller group b6 is used to perform the fourth-round rolling on the strip 1 output by the second welding machine b5 to achieve the straightening of the strip 1, so that the cross-section of the strip 1 further approaches the "grid" shape state, ensuring better quality of the cross-section of the finally produced profile.

[0053] It should be noted that, in the description of the present application, the terms "inside", "outside", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application. All directional indications (such as up, down, left, right, front, back, inside, and outside) are only used to explain the relative positional relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0054] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for forming a mesh-shaped profile structure, characterized in that: A first roller group (b1), a second roller group (b2), a first welding machine (b3), a third roller group (b4) and a second welding machine (b5) are successively arranged along the traveling direction of the strip (1); specifically, it includes the following steps: S1. Feed the flat strip (1) to the first roller group (b1). Multiple rollers of the first roller group (b1) perform the first-round rolling on the strip (1) so that a concave structure (2) with a downward concave notch gradually forms at the left side position of the strip (1), and the lower end of the left wall of the concave structure (2) bends leftward to form a first welding part (21). At the same time, a cover plate structure (3) with a width twice that of the concave structure (2) gradually forms at the right side position of the strip (1), and the right end of the cover plate structure (3) bends upward to form a second welding part (31); S2. Feed the strip (1) to the second roller group (b2). Multiple rollers of the second roller group (b2) perform the second-round rolling on the strip (1) so that the concave structure (2) flips towards the middle of the strip (1) until the bottom wall of the concave structure (2) fits to the middle of the strip (1). At this time, a first square structure (11) is formed by enclosing the position of the strip (1) on the left side of the concave structure (2), and at the same time, the cover plate structure (3) bends upward relative to the middle of the strip (1); S3. Feed the strip (1) to the first welding machine (b3). The first welding machine (b3) welds the bottom wall of the concave structure (2) to the middle of the strip (1); S4. Feed the strip (1) to the third roller group (b4). Multiple rollers of the third roller group (b4) perform the third-round rolling on the strip (1) so that the cover plate structure (3) flips towards the middle of the strip (1) until the first welding part (21) contacts the middle of the cover plate structure (3), and the second welding part (31) of the cover plate structure (3) contacts the left wall of the concave structure (2) after being flipped in S2. At this time, a second square structure (12) is formed by enclosing the concave notch of the concave structure (2) and the cover plate structure (3), and a third square structure (13) is formed by enclosing the position of the strip (1) on the right side of the concave structure (2); S5. Feed the strip (1) to the second welding machine (b5). The second welding machine (b5) welds the first welding part (21) and the middle of the cover plate structure (3), and at the same time welds the second welding part (31) and the left wall of the concave structure (2) after being flipped in S2, so that the cross-section of the strip (1) forms a "grid" shape.

2. The method for forming a .-shaped profile structure according to claim 1, characterized in that: It further includes a fourth roller group (b6) located on the output side of the second welding machine (b5). In step S5, the fourth roller group (b6) is used to perform the fourth-round rolling on the strip (1) output by the second welding machine (b5) to achieve the straightening of the strip (1), so that the cross-section of the strip (1) further approaches the "grid" shape.

3. The method for forming a .-shaped profile structure according to claim 1, characterized in that: The widths of the first square structure (11), the second square structure (12) and the third square structure (13) are equal.

4. The method for forming a .-shaped profile structure according to claim 1, characterized in that: Both the first welding machine (b3) and the second welding machine (b5) are laser welding machines.

5. The method for forming a .-shaped profile structure according to claim 1, characterized in that: The material of the material strip (1) is ultra-high strength steel with a yield strength of ≥1000Mpa, a tensile strength of ≥1200Mpa, and an elongation after fracture of ≥9%.

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