Integrated steel multi-rib and multi-cavity rolling profile and processing method thereof

Abstract

The invention discloses an integrated steel multi-rib and multi-cavity rolling profile and a processing method thereof. The integrated steel multi-rib and multi-cavity rolling profile comprises a multi-cavity box body, the multi-cavity box body is of a closed multi-cavity structure formed by bending a plate for multiple times, the two ends of the plate are welded to the top end of the middle cavity, and a welding seam is located in the center of the top end face of the multi-cavity box body. The section of the multi-cavity box body is divided into an odd number of closed cavities, the number of the closed cavities is at least three, and the closed cavities are in bilateral symmetry; the rolling profile is manufactured through the working procedures of uncoiling, correcting, bending, welding, detaching and cutting and the like in a matched mode. The rolling profile is reasonable in structural design, the section of the rolling profile is composed of a plurality of closed cavities, the multi-cavity structure can play a stable supporting role, and the bending resistance and energy absorption of the rolling profile in the collision process are obviously improved.

Description

TECHNICAL FIELD

[0001] The application relates to an integrated steel multi-rib multi-cavity roll-shaped section and a processing method thereof, in particular to an integrated steel multi-rib multi-cavity roll-shaped section and a processing method thereof, and belongs to the technical field of automobile section processing. BACKGROUND

[0002] With the global emphasis on environmental protection and energy saving and emission reduction, automobile lightweighting has become an important development direction of the automobile industry; at present, domestic automobiles have achieved remarkable growth in output, sales and market share, especially in the field of new energy vehicles; therefore, new energy vehicles have higher requirements for battery pack protection, vehicle body structure strength and lightweighting, prompting enterprises to develop more advanced structure sections and process technologies; in order to meet the lightweighting requirement of the vehicle body structure, the traditional method generally adopts an aluminum alloy section structure, but due to the low strength of the aluminum alloy material, a large wall thickness of the aluminum alloy section is required, in order to further improve the strength, a more complex multi-cavity structure is designed, resulting in high manufacturing cost; secondly, the vehicle body structure is mostly made of steel material, and problems such as steel-aluminum dissimilar material connection exist, for example, the problem of electrochemical corrosion at the steel-aluminum interface, the steel-aluminum connection can only adopt methods such as adhesive bonding, screwing and riveting, the strength of the connection position is low, the processing procedure is complicated, and the manufacturing cost of the whole vehicle is increased; and after the aluminum section is deformed in a collision, it is difficult to repair, and the whole part may need to be replaced, increasing the maintenance cost; with the continuous improvement of the strength of high-strength steel, the advantages of high-strength steel are increasingly prominent, for example, steel automobile anti-collision beams, door sill reinforcing beams and other parts, the structures of which are mostly single-cavity or simple structure sections; in order to meet the strength requirement, these structures are often heavy, which is not conducive to the lightweighting design of automobiles; secondly, the structural strength is insufficient, and the single-cavity structure has limitations in bending resistance and torsional resistance, and it is difficult to meet the requirements of modern automobiles for high strength and high safety; in addition, the higher the strength of high-strength steel, the more difficult the processing is, and the traditional stamping process cannot meet the forming requirement, not only the production efficiency is low, but also the material utilization rate is low, and the cost is high; in order to meet the increasing demand of automobile manufacturers for lightweighting and high-strength parts, the development of multi-cavity multi-rib roll-shaped section technology is promoted; the multi-cavity multi-rib integrated roll-shaped section technology is an advanced manufacturing technology developed on the basis of traditional section processing technology and in combination with the demand of modern automobiles for lightweighting, high strength and high safety; it not only can realize the forming of a complex cross-section structure and significantly improve the performance of the part, but also can effectively reduce the cost; in addition to the automobile field, the multi-cavity multi-rib roll-shaped section technology can also be applied to the fields of aerospace and rail transit, and promote the lightweighting development of related industries, and has broad application prospects. SUMMARY

[0003] The application aims at overcoming the shortcomings of the prior art, and provides an integrated steel multi-rib multi-cavity roll-shaped section and a processing method thereof, which can improve the performance of the section, reduce the weight of the vehicle body and achieve the purpose of lightweighting.

[0004] The problems described in the present application are solved by the following technical solutions: The integrated steel multi-rib multi-cavity roll-shaped profile comprises a multi-cavity box body; the multi-cavity box body is a closed multi-cavity structure formed by multiple bending of a plate material, two ends of the plate material and top ends of middle cavities are welded together, and a weld is at the center of a top end surface of the multi-cavity box body; a cross section of the multi-cavity box body is divided into an odd number of closed cavities, the number of cavities is at least three, and the cavities are left-right symmetrical.

[0005] The integrated steel multi-rib multi-cavity roll-shaped profile, the central cavity of the multi-cavity box body is square or circular, and the top end of the central cavity is welded with the center of the top end surface of the outer side wall of the multi-cavity box body; the top end surface of the multi-cavity box body is a straight horizontal surface or an arc surface that is concave inward at the center based on the horizontal surface.

[0006] The integrated steel multi-rib multi-cavity roll-shaped profile, the multi-cavity box body has five cavities, the rightmost end of the left lower cavity and the leftmost end of the right lower cavity are welded, and the weld is the lowest end of the middle cavity; the bottom end surfaces of the left lower cavity and the right lower cavity are both horizontal surfaces; the left and right ends of the middle cavity are respectively welded with the side walls on both sides of the multi-cavity box body, the left side is a left weld, and the right side is a right weld, the upper and lower ends of the left weld correspond to two cavities respectively, and the upper and lower ends of the right weld correspond to another two cavities respectively.

[0007] The integrated steel multi-rib multi-cavity roll-shaped profile, the side walls on the left and right sides of the multi-cavity box body are provided with three shapes of vertical, inclined and folded, wherein the vertical shape is that the side walls on the left and right sides of the multi-cavity box body are vertical surfaces; the inclined shape is that the side walls on the left and right sides of the multi-cavity box body are inclined surfaces, and the distance between the lowest ends of the two inclined surfaces is greater than the distance between the highest ends of the two inclined surfaces; in the folded shape, the side wall on the left side is divided by a left weld, the upper segment of the left side wall is a vertical surface, and the lower segment is an inclined surface, and the distance between the lowest end of the inclined surface and the vertical bisector of the multi-cavity box body is greater than the distance between the highest end of the inclined surface and the vertical bisector of the multi-cavity box body, and the side wall on the right side is symmetrical to the side wall on the left side about the vertical bisector of the multi-cavity box body.

[0008] The integrated steel multi-rib multi-cavity roll-shaped profile, the multi-cavity box body has three cavities, the left and right ends of the middle cavity do not contact the side walls on both sides of the multi-cavity box body; the bottom end surfaces of the cavities on both sides are both horizontal surfaces; the side walls on the left and right sides of the multi-cavity box body are both vertical surfaces.

[0009] The processing method of the integrated steel multi-rib multi-cavity roll-shaped profile, comprises the following steps: S1, unwinding and flattening the plate material; S2. The leveled sheet metal is fed into the cold bending forming unit. First, the central main cavity is symmetrically formed starting from the center of the steel strip. The contact points on the lower surface of the central main cavity are welded together. Then, the upper surface support walls on both sides are symmetrically bent. Then, the bottom corners on both sides are symmetrically bent to form the side support walls. Depending on the shape requirements of the profile, it is decided whether to make the left and right ends of the middle cavity contact the side walls of the bent sheet metal on both sides. When the top of the middle cavity contacts and overlaps with the sheet metal, the contact parts are welded. If the two sides of the middle cavity contact the sheet metal on both sides, the contact parts are welded. If they do not contact, there is no need to weld the two sides. Finally, the multi-cavity box is assembled and formed. Finally, the cross-section is finished. S3. Cut the roll-formed profile to the required length and then cut it into its final size. The processing method of integrated steel multi-ribbed multi-cavity roll-formed profiles, the multi-cavity roll-formed profile production line is set up in sequence with an uncoiler, a leveler, a mechanical press, a servo feeding mechanism, a hole punching detection mechanism, a pit bridge, a first cold bending forming unit, a first welding mechanism, a second cold bending forming unit, a second welding mechanism, a cutting mechanism, and a receiving mechanism. The uncoiler and the leveler are used to uncoil and level the sheet metal. According to the installation and connection requirements of the roll-formed profile and other components, a servo feeding unit is provided after the mechanical press and before the first cold bending forming unit as an electronic auxiliary device before pre-punching, which is used to assist in pre-punching fixed-length feeding; the missing punch detection unit is used to check whether there are any missing punches in the punching unit. Since the punching speed and the metal sheet feeding speed are not necessarily the same, a first pit bridge is set downstream of the first mechanical press to store metal sheet material. This ensures that the front and rear processing are not affected when the production speeds of the front and rear are different. It is mainly used for the correction of the material belt required by the mechanical press and the front and rear. Both the first and second cold bending forming units are equipped with multiple pressure rollers. The shape and arrangement of the rollers are determined according to the specific structure of the multi-cavity profile. When the structure or shape of the profile is modified, adjustments can be made by increasing or decreasing the number of pressure roller passes and changing the shape within the corresponding cold bending forming unit. Processing of products with different structures can be achieved with relatively minor equipment modifications. The welding machines in the first and second welding mechanisms can be arc welding machines or fusion welding machines, offering high welding speed and precision. A cutting mechanism is installed downstream of the welding mechanisms to cut the profile according to its intended length. The multi-cavity structure of the present application can play a stable supporting role, significantly improve the bending resistance and energy absorption in the collision process of the roll-formed profile; the present application also provides a roll forming method for the multi-cavity profile, the multi-cavity structure is processed by roll forming, which is easy to implement, has good weldability and manufacturability, high strength and high rigidity of the product, and significantly improves the structural stability of the product. The multi-cavity structure designed in the present application has the following beneficial effects: (1) Bending resistance: the multi-cavity structure can effectively disperse and absorb impact force through the distribution of multiple independent chambers, improving the bending resistance; (2) Torsional resistance: the multi-beam structure (such as reinforcing ribs, ribs, etc.) can enhance the torsional resistance of the profile and improve the stability of the overall structure; (3) Lightweight: by optimizing the cross-sectional design, the amount of material is reduced while maintaining or improving the structural strength, achieving the goal of lightweight; (4) Integrated steel multi-beam multi-cavity structure: the cavity forming process in this structure has lower manufacturing difficulty, fewer forming passes and fewer dies, and lower cost. This structure design has not been reported in the prior art and has high innovation; (5) Integrated processing method: realizes the integrated forming of multi-cavity and rib, avoids the traditional multi-pass welding splicing process of split multi-cavity structure, greatly improves the production efficiency, reduces the production cost, and improves the dimensional accuracy and stability of the product; (6) Customizable design: by optimizing the design of the rib, the stress condition and use scenario of the profile are optimized to ensure that sufficient support force is provided under stress in different directions, further improving the mechanical properties of the profile.

[0010] (7) Suitable for various application scenarios: the profile structure and processing method of the present application are suitable for the manufacturing of various automobile parts, such as crash beams, door sill reinforcements, battery package edge beams, etc., and have wide applicability and market prospects. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a schematic diagram of the vertical structure of the left and right side walls of the roll-formed profile of the present application; Figure 2 is a schematic diagram of the inclined structure of the left and right side walls of the roll-formed profile of the present application; Figure 3 is a schematic diagram of the folded structure of the left and right side walls of the roll-formed profile of the present application; Figure 4 is a schematic diagram of the vertical structure of the left and right side walls of the roll-formed profile of the present application; Figure 5This is a schematic diagram of the roll forming process of the present invention; Figure 6 This is a connection block diagram of the roll forming profile processing production line of the present invention; Figure 7 This is a schematic diagram of the roll forming profile processing production line of the present invention.

[0012] The list of labels in the diagram is as follows: 10. Uncoiler, 20. Leveler, 30. Mechanical press, 40. Servo feeding mechanism, 50. Missing punch detection mechanism, 60. Pit bridge, 70. First cold bending forming unit, 80. First welding mechanism, 90. Second cold bending forming unit, 100. Second welding mechanism, 110. Cutting mechanism, 120. Receiving mechanism. Detailed Implementation

[0013] See Figure 1 , 2 3, 4, 5, 6 and Figure 7 The present invention includes a multi-cavity box body; the multi-cavity box body is a closed multi-cavity structure formed by bending a piece of plate through multiple bends, the two ends of the plate body are welded to the top of the middle cavity, and the weld is at the center of the top surface of the multi-cavity box body; the cross-section of the multi-cavity box body is divided into an odd number of closed cavities, the minimum number of cavities is three, and they are symmetrical from left to right.

[0014] The central cavity of the multi-cavity box is square or circular, and the top of the central cavity is welded to the center of the top surface of the outer wall of the multi-cavity box; the top surface of the multi-cavity box is a straight horizontal plane or, based on a horizontal plane, the central part is an inwardly concave arc surface; when the top surface is straight, the profile is easy to install; if the central part is an inwardly concave arc surface based on a horizontal plane, this serves to enhance the collapse effect; Figure 1 For example, Figure 1 The top surfaces of the first and third ones from left to right are straight horizontal planes, while the second and fourth ones are curved surfaces with an inward concave center, based on the horizontal plane.

[0015] When the central cavity is circular, it can serve as an additional functional hole for the vehicle body; for example, as a door sill beam structure, it can realize functions such as cooling pipes and exhaust pipes, which conforms to the integrated design of roll forming, reduces the difficulty of vehicle body space layout, can significantly reduce the number of parts and assembly processes, and improve production efficiency.

[0016] The multi-cavity box contains five cavities. The rightmost end of the lower left cavity is welded to the leftmost end of the lower right cavity, and the weld is at the lowest end of the middle cavity. The bottom surfaces of the lower left and lower right cavities are both horizontal. The left and right ends of the middle cavity are welded to the side walls of the multi-cavity box, respectively. The left side is the left weld, and the right side is the right weld. The upper and lower ends of the left weld correspond to two cavities, and the upper and lower ends of the right weld correspond to the other two cavities.

[0017] The side walls on the left and right sides of the multi-cavity box have three forms: vertical, inclined, and folded. In the vertical form, the two outermost side walls of the multi-cavity box are vertical planes. In the inclined form, the two outermost side walls of the multi-cavity box are inclined planes, and the distance between the lowest points of the two inclined planes is greater than the distance between the highest points of the two inclined planes. In the folded form, the left side wall is divided by the left weld seam. The upper part of the left side wall is a vertical plane, and the lower part is an inclined plane. The distance between the lowest point of the inclined plane and the perpendicular bisector of the multi-cavity box is greater than the distance between the highest point of the inclined plane and the perpendicular bisector of the multi-cavity box. The right side wall is symmetrical to the left side wall about the perpendicular bisector of the multi-cavity box. Figure 1 This is a schematic diagram of a multi-cavity box with vertical side walls on both sides and welded together.

[0018] With the side walls on both sides of the multi-cavity box in a folded state, the welding position serves as the dividing line. One half is a vertical plane support wall, and the other half is an inclined support arm with a certain angle. The inclined support arm can serve as a crushing guide, effectively dispersing and transmitting collision force, improving the strength and stiffness of the cross-sectional structure, and further enhancing the energy absorption effect of the collision. Figure 3 This is a schematic diagram showing the folded side walls on the left and right sides of a multi-cavity box.

[0019] With the side walls on both sides of the multi-cavity box being inclined, the roll-formed profile presents a symmetrical trapezoidal structure. The trapezoidal structure enhances the crushing and guiding function, further disperses and transmits the collision force, and greatly improves the strength, stiffness and energy absorption effect of the cross-sectional structure. Figure 2 This is a schematic diagram showing the inclined side walls on the left and right sides of a multi-cavity box.

[0020] The multi-cavity box contains three cavities. The left and right ends of the middle cavity do not contact the side walls of the multi-cavity box. The bottom surfaces of the two side cavities are horizontal. The side walls of the multi-cavity box are vertical. Figure 4 This is a schematic diagram showing that the left and right ends of the middle cavity do not contact the side walls on both sides of the multi-cavity box.

[0021] The two side support walls do not need to be welded together. They are mainly used for crushing guidance to improve the energy absorption effect of collision. Secondly, reducing the number of welds avoids welding deformation and reduces the investment cost of welding equipment.

[0022] This invention includes the following steps: S1. Uncoil and level the board material; S2. The leveled sheet metal is fed into the cold bending forming unit. First, the central main cavity is symmetrically formed starting from the center of the steel strip. The contact points on the lower surface of the central main cavity are welded together. Then, the upper surface support walls on both sides are symmetrically bent. Then, the bottom corners on both sides are symmetrically bent to form the side support walls. Depending on the shape requirements of the profile, it is decided whether to make the left and right ends of the middle cavity contact the side walls of the bent sheet metal on both sides. When the top of the middle cavity contacts and overlaps with the sheet metal, the contact parts are welded. If the two sides of the middle cavity contact the sheet metal on both sides, the contact parts are welded. If they do not contact, there is no need to weld the two sides. Finally, the multi-cavity box is assembled and formed. Finally, the cross-section is finished. With attachment Figure 1 Taking the second profile from the left as an example, its cold bending forming includes four stages, attached... Figure 5 For the appendix Figure 1 The bending process of the second profile from left to right; The first stage involves symmetrical machining starting from the center of the steel strip, followed by... Figure 5 The first 11 sets of rollers form the central main cavity, and then the overlapping positions of the lower surface of the central cavity are welded together, forming a total of 11 passes; The second stage involves symmetrical bending of the upper surface support walls on both sides using 12-20 sets of rollers; a total of 9 forming processes are required. In the third stage, after 21-27 sets of rollers symmetrically bend the bottom corners on both sides, the two side support walls are formed. When the two side support arms and the upper support arm contact and overlap with the central cavity, the left and right sides and the upper surface are welded together to form four triangular closed cavities. The process involves a total of 7 forming steps. In the fourth stage, more precise cross-sectional accuracy control is achieved through the sizing unit, which involves three forming passes. S3. Cut the roll-formed profile to the required length and then cut it into its final size. The multi-cavity roll forming profile production line is sequentially equipped with an uncoiler 10, a leveler 20, a mechanical press 30, a servo feeding mechanism 40, a hole punching detection mechanism 50, a pit bridge 60, a first cold bending forming unit 70, a first welding mechanism 80, a second cold bending forming unit 90, a second welding mechanism 100, a cutting mechanism 110, and a receiving mechanism 120. The uncoiler 10 and the leveler 20 are used for uncoiling and leveling the sheet metal. In actual processing, due to the need to change the sheet metal coil, the outlet end of the leveling machine 20 is also equipped with a shearing and welding mechanism to cut the head and tail of the sheet metal and weld the front and rear steel together when changing the sheet metal coil, so as to achieve continuous feeding, reduce material waste, and improve efficiency. Since the punching speed and the sheet metal feeding speed may not be the same, the downstream of the mechanical press 30 is equipped with a first pit bridge 60 for storing sheet metal materials. When the front and rear production speeds are different, it is ensured that the front and rear processing is not affected. It is mainly used for the correction of the material strip required by the mechanical press 30 and the front and rear. According to the installation and connection requirements of the roll-formed profile and other components, a servo feeding unit is provided after the mechanical press 30 and before the first cold bending forming unit 70 as an electronic auxiliary device before pre-punching, which is used to assist in pre-punching fixed-length feeding; the missing punch detection unit is used to check whether there are any missing punches in the punching unit. Since the punching speed and the metal sheet feeding speed are not necessarily the same, a first pit bridge 60 is set downstream of the first mechanical press 30 to store metal sheet material. This ensures that the front and rear processing are not affected when the production speeds of the front and rear are different. It is mainly used for the correction of the material strips required by the mechanical press 30 and the front and rear. Both the first cold bending forming unit 70 and the second cold bending forming unit 90 are equipped with multiple pressure rollers. The shape and arrangement of the rollers are determined according to the specific structure of the multi-cavity profile. When the structure or shape of the profile is changed, adjustments can be made by increasing or decreasing the number of pressure roller passes and changing the shape in the corresponding cold bending forming unit. Different structural products can be processed with relatively minor equipment modifications. The welding machines in the first welding mechanism 80 and the second welding mechanism 100 can be arc welding machines or fusion welding machines, which have fast welding speed and high precision. Downstream of the welding mechanism 100, there is a cutting mechanism 110 for cutting the profile according to the length to be used; a receiving mechanism 120 is provided on the rear side of the cutting mechanism 110 for receiving and transferring materials.

Claims

1. A one-piece steel multi-ribbed, multi-cavity roll-formed profile, characterized in that: It includes a multi-cavity box body; the multi-cavity box body is a closed multi-cavity structure formed by bending a piece of plate through multiple bends. The two ends of this plate body are welded to the top of the middle cavity, and the weld is located at the center of the top surface of the multi-cavity box body. The cross-section of the multi-cavity box body is divided into an odd number of closed cavities, with a minimum of three cavities, and they are symmetrical from left to right.

2. The integrated steel multi-ribbed multi-cavity roll-formed profile according to claim 1, characterized in that: The central cavity of the multi-cavity box is square or circular, and the top of the central cavity is welded to the center of the top surface of the outer wall of the multi-cavity box; the top surface of the multi-cavity box is a straight horizontal plane or, based on the horizontal plane, the central part is an inwardly concave arc surface.

3. The integrated steel multi-ribbed multi-cavity roll-formed profile according to claim 2, characterized in that: The multi-cavity box contains five cavities. The rightmost end of the lower left cavity is welded to the leftmost end of the lower right cavity, and the weld is at the lowest end of the middle cavity. The bottom surfaces of the lower left and lower right cavities are both horizontal. The left and right ends of the middle cavity are welded to the side walls of the multi-cavity box, respectively. The left side is the left weld, and the right side is the right weld. The upper and lower ends of the left weld correspond to two cavities, and the upper and lower ends of the right weld correspond to the other two cavities.

4. The integrated steel multi-ribbed multi-cavity roll-formed profile according to claim 3, characterized in that: The side walls on the left and right sides of the multi-cavity box have three forms: vertical, inclined, and folded. In the vertical form, the two outermost side walls of the multi-cavity box are vertical planes. In the inclined form, the two outermost side walls of the multi-cavity box are inclined planes, and the distance between the lowest points of the two inclined planes is greater than the distance between the highest points of the two inclined planes. In the folded form, the left side wall is divided by the left weld seam. The upper part of the left side wall is a vertical plane, and the lower part is an inclined plane. The distance between the lowest point of the inclined plane and the perpendicular bisector of the multi-cavity box is greater than the distance between the highest point of the inclined plane and the perpendicular bisector of the multi-cavity box. The right side wall is symmetrical to the left side wall about the perpendicular bisector of the multi-cavity box.

5. The integrated steel multi-ribbed multi-cavity roll-formed profile according to claim 2, characterized in that: The multi-cavity box contains three cavities. The left and right ends of the middle cavity do not contact the side walls on both sides of the multi-cavity box. The bottom surfaces of the two side cavities are horizontal. The side walls on both sides of the multi-cavity box are vertical.

6. The processing method of the integrated steel multi-ribbed multi-cavity roll-formed profile according to any one of claims 1-5, characterized in that: Includes the following steps: S1. Uncoil and level the board material; S2. The leveled sheet metal is fed into the cold bending forming unit. First, the central main cavity is symmetrically formed starting from the center of the steel strip. The contact points on the lower surface of the central main cavity are welded together. Then, the upper surface support walls on both sides are symmetrically bent. Then, the bottom corners on both sides are symmetrically bent to form the side support walls. Depending on the shape requirements of the profile, it is decided whether to make the left and right ends of the middle cavity contact the side walls of the bent sheet metal on both sides. When the top of the middle cavity contacts and overlaps with the sheet metal, the contact parts are welded. If the two sides of the middle cavity contact the sheet metal on both sides, the contact parts are welded. If they do not contact, there is no need to weld the two sides. Finally, the multi-cavity box is assembled and formed. Finally, the cross-section is finished. S3. Cut the roll-formed profile to the required length and then cut it into its final size.

7. The processing method of the integrated steel multi-ribbed multi-cavity roll-formed profile according to claim 6, characterized in that: The multi-cavity roll forming profile production line is sequentially equipped with an uncoiler (10), a leveler (20), a mechanical press (30), a servo feeding mechanism (40), a hole punching detection mechanism (50), a pit bridge (60), a first cold bending forming unit (70), a first welding mechanism (80), a second cold bending forming unit (90), a second welding mechanism (100), a cutting mechanism (110), and a receiving mechanism (120). The uncoiler (10) and the leveler (20) are used to uncoil and level the sheet metal. According to the installation and connection requirements of the roll-formed profile and other components, a servo feeding unit is provided after the mechanical press (30) and before the first cold bending forming unit (70) as an electronic auxiliary device before pre-punching, which is used to assist in pre-punching fixed-length feeding; the missing punching detection unit is used to check whether the punching unit has missing punching. Since the punching speed and the metal sheet feeding speed are not necessarily the same, a first pit bridge (60) is set downstream of the first mechanical press (30) to store metal sheet materials. When the production speeds of the front and rear are different, it ensures that the front and rear processing is not affected. It is mainly used for the correction of the material belt required by the mechanical press (30) and the front and rear. Both the first cold bending forming unit (70) and the second cold bending forming unit (90) are equipped with multiple pressure rollers. The shape and arrangement of the rollers are determined according to the specific structure of the multi-cavity profile. When the structure and shape of the profile are changed, adjustments can be made by increasing or decreasing the number of pressure rollers and changing their shape in the corresponding cold bending forming unit. Different structural products can be processed with relatively small equipment modifications. The welding machines in the first welding mechanism (80) and the second welding mechanism (100) can be electric arc welding machines or fusion welding machines, which have fast welding speed and high precision. A cutting mechanism (110) for cutting the profile according to the length of use is provided downstream of the welding mechanism (100).

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