A metal sheet forming apparatus and method
By continuously rolling, stamping grooved structures, and cutting seams on thin metal sheets, the problem of the difficulty in processing the folded edge structure of the roof side skin of buses in one go was solved, which improved production efficiency, reduced labor intensity, and ensured the quality of finished products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHENGZHOU YUTONG BUS CO LTD
- Filing Date
- 2023-10-13
- Publication Date
- 2026-07-07
AI Technical Summary
In the existing technology, the Z-shaped folded edge structure at the end of the roof side skin of a bus made of thin metal sheet cannot be processed in one go, resulting in low production efficiency. Furthermore, the skin is easily bumped and scratched during the transfer process, and the labor intensity of the workers is high.
A metal sheet forming method and equipment are used. After continuous roll forming by a roll forming equipment, a groove structure is stamped on the workpiece blank and a Z-shaped structure is formed before cutting. Then, it is transversely cut to complete the folded structure. A cutting device is used to cut out deformation seams before stamping to avoid stretching deformation. Finally, a cutting device removes waste material to ensure that the end face is flat.
It enables efficient forming of thin metal sheets, improves production efficiency, reduces labor intensity, avoids scratches and dents on the skin, and ensures the quality of finished products.
Smart Images
Figure CN117428421B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of sheet metal forming, and in particular relates to a metal sheet forming equipment and method. Background Technology
[0002] In industrial applications, sheet metal is often processed through rolling, stamping, cutting, and folding to obtain workpieces of the desired shape. For example, the roof side skin of a bus is made from sheet metal through a series of processes.
[0003] The structure of the bus roof side skin is as follows Figure 1 and Figure 2 As shown, the edge of the finished part 1 of the bus roof side skin on one side is an Ω-shaped structure 4, and multiple U-shaped reinforcing ribs 3 extending along its length (i.e., longitudinal direction) are also formed. At the edges of the two longitudinal ends of the bus roof side skin, Z-shaped folded edge structures 2 are also formed. See Appendix for details on folded edge structures 2. Figure 3 and attached Figure 4 .
[0004] Since the Ω-shaped structure 4 and the reinforcing rib 3 mentioned above are both structures with equal cross sections, they can be processed using roll forming equipment. However, the Z-shaped folded structure at both ends of the longitudinal direction of the top skin cannot be processed simultaneously using roll forming equipment. It is necessary to roll form the remaining structures, cut the skin blank (the blank extends longitudinally) to the required length, and then transport it to the corresponding workstation for stamping and edge trimming. Furthermore, the folded structure at both ends of the longitudinal direction of the skin needs to be stamped twice, resulting in low production efficiency.
[0005] In addition, the sheet metal blanks need to be manually handled between different processes, which results in high labor intensity for the workers, and the sheet metal blanks are prone to bumps and scratches during the handling process. Summary of the Invention
[0006] One of the objectives of this invention is to provide a metal sheet forming method to solve the technical problems in the prior art where the folded edge structure of the bus roof side skin made of metal sheet cannot be processed in one go, thus requiring the skin to be cut and processed separately, resulting in low skin production efficiency, easy bumps and scratches during skin transfer, and high labor intensity for workers transferring the skin.
[0007] Another object of the present invention is to provide a metal sheet forming device to solve the above-mentioned technical problems.
[0008] To achieve the above objectives, the technical solution of the metal sheet forming method provided by the present invention is as follows:
[0009] A method for forming metal sheets involves first using a roll forming device to continuously roll form a workpiece blank that extends longitudinally, then stamping a groove-shaped structure that extends laterally onto the workpiece blank, then transversely cutting the workpiece blank and passing the cut surface through the groove-shaped structure to finally obtain a finished workpiece. After cutting, a part of the groove-shaped structure constitutes the folded edge structure at the end of the finished workpiece, and another part constitutes the folded edge structure at the end of the remaining workpiece blank. The above operation is repeated on the remaining workpiece blank.
[0010] The beneficial effects are as follows: The above technical solution is a pioneering invention. In the above technical solution, when the grooved structure is stamped onto the workpiece blank, the workpiece blank is not yet cut, so it can still move under the drive of the rolling equipment. After the workpiece blank is cut, the finished workpiece will separate from the remaining workpiece blanks. The sidewalls and bottom walls of the grooved structure originally formed on the workpiece blank, as well as the workpiece blank portion connected to the sidewalls of the grooved structure, together form a Z-shaped structure. Therefore, when the final finished workpiece is cut off, its rear end and the front end of the remaining workpiece blank, i.e., the front end of the next segment of the finished workpiece, will form the required folded edge structure. After repeating the above operation, the required folded edge structure will be formed at both ends of each segment of the finished workpiece. Compared with the prior art, the above technical solution can obtain two folded edge structures in one stamping process, so that the front and rear ends of the finished workpiece have the required folded edge structure when it is cut off from the remaining workpiece blanks, eliminating the need to transfer the skin to other workstations for further processing, effectively improving production efficiency. Between the finished workpiece being cut from the remaining workpiece blanks, the workpiece blanks can be moved between different workstations by being driven by the roller pressing equipment, which ensures production efficiency while reducing the labor intensity of the workers.
[0011] As a further improvement, before stamping the grooved structure into the workpiece blank, a deformation joint extending laterally is cut at the corresponding position of the grooved structure to be formed, and the length of the deformation joint is greater than or equal to the length of the grooved structure.
[0012] The beneficial effect is that, since deformation seams are formed on the workpiece blank, the bottom of the groove structure can flow freely towards the corresponding side wall during the stamping process, thus preventing the main body of the workpiece blank connected to the side wall of the groove structure from being stretched and deformed, which would reduce its thickness and affect the overall quality of the workpiece blank.
[0013] As a further improvement, during the process of cutting out the deformation joint, the part of the workpiece blank edge that is not stamped into a groove structure is also cut off, forming a deformation joint containing a wide joint segment and a narrow joint segment, wherein the wide joint segment corresponds to the part that is not stamped into a groove structure.
[0014] The beneficial effect is that, since the groove structure is not formed in the wide section, when processing the groove structure on the workpiece blank, the workpiece blank on both sides of the wide section has less pulling and restriction on the plastic flow of the material during the forming of the groove structure, which is more conducive to the forming of the groove structure.
[0015] As a further improvement, the method of transverse cutting of workpiece blank is to cut two cross sections in the transverse direction to divide the original workpiece blank into finished workpiece, scrap material and remaining workpiece blank, wherein the width of the scrap material is greater than the width of the expansion joint.
[0016] The beneficial effect is that during the stamping process of forming the grooved structure, the distance between the two side walls of the expansion joint will continue to increase. If the finished workpiece is cut off directly, the end of the finished workpiece will be uneven. The above technical solution not only cuts off the finished workpiece but also completes the edge trimming operation of the skin end face, making the rear end face of the finished workpiece and the front end face of the remaining workpiece blank smoother to meet the usage requirements.
[0017] As a further improvement, the formed groove structure is symmetrical about the expansion joint.
[0018] The beneficial effect is that the above technical solution can ensure that the folded edge structure dimensions of the front and rear ends of the finished workpiece are consistent.
[0019] To achieve the above objectives, the technical solution of the metal sheet forming equipment provided by the present invention is as follows:
[0020] A metal sheet forming equipment includes a rolling unit, a forming unit, and a cutting unit arranged sequentially along the moving direction of the workpiece blank. The forming unit includes at least one stamping device for forming a groove-shaped structure on the workpiece blank. The stamping device includes a stamping punch and a stamping die whose parting surface is adapted to the cross-sectional shape of the workpiece blank. The cutting unit includes a cutting device for transversely cutting the workpiece blank from the groove-shaped structure to obtain a finished workpiece, and a portion of the cut groove-shaped structure constitutes the folded edge structure at the end of the finished workpiece, while another portion constitutes the folded edge structure at the end of the remaining workpiece blank.
[0021] The beneficial effects are as follows: The above technical solution is a pioneering invention. In use, the rolling unit can form a structure extending longitudinally along the workpiece blank and drive the workpiece blank to move. After leaving the rolling unit, the workpiece blank will be stamped with a groove-like structure at the forming unit. The sidewalls and bottom wall of the groove-like structure, along with the workpiece blank portion connected to the sidewalls of the groove-like structure, together form a Z-shaped structure. Finally, the cutting unit transversely cuts the workpiece blank from the groove-like structure, and the rear end of the final finished workpiece and the front end of the remaining workpiece blank (i.e., the front end of the next finished workpiece) will form the required folded edge structure. Compared to existing technologies, the above technical solution allows one stamping device to form two required folded edge structures at once, eliminating the need for two stamping operations and effectively improving production efficiency. Furthermore, the workpiece blank can be driven by the rolling unit from the rolling unit to the forming unit and then to the cutting unit, eliminating the need for workers to transfer materials, reducing labor intensity, and achieving high production efficiency and easy automation.
[0022] As a further improvement, the metal sheet forming equipment also includes a slit unit located between the roll forming unit and the forming unit, the slit unit including at least one slit device for cutting deformation seams at corresponding positions of the groove-shaped structure to be formed on the workpiece blank.
[0023] The beneficial effect is that, since deformation seams are formed on the workpiece blank, the bottom of the groove structure can flow freely towards the corresponding side wall during the stamping process, thus preventing the main body of the workpiece blank connected to the side wall of the groove structure from being stretched and deformed, which would reduce its thickness and affect the overall quality of the workpiece blank.
[0024] As a further improvement, the slitting device includes a slitting die for supporting the workpiece blank, a main slitting punch, an auxiliary slitting punch, a main slitting drive device for driving the main slitting punch, and an auxiliary slitting drive device for driving the auxiliary slitting punch. The auxiliary slitting punch is at least one in number and is used to cut off the portion of the workpiece blank edge that is not stamped into a groove-like structure to form a wide slitting segment. The main slitting punch is used to cut out a narrow slitting segment. The wide slitting segment and the narrow slitting segment together form the deformation joint.
[0025] The beneficial effects are as follows: Because the edge of the workpiece blank has an Ω-shape, the angle between the workpiece blank and the main cutting punch is relatively large in some areas, allowing the main cutting punch to effectively form the deformation joint. However, the angle between the workpiece blank and the main cutting punch is relatively small in other areas, making it difficult to form the deformation joint effectively using the main cutting punch. Therefore, using an auxiliary cutting punch with a different moving direction than the main cutting punch can better form this part of the deformation joint. Furthermore, the auxiliary cutting punch can also form the wide section of the deformation joint. Since the wide section does not form a groove structure, when machining the groove structure on the workpiece blank, the workpiece blank on both sides of the wide section exerts less strain and restriction on the plastic flow of the material during groove structure forming, which is more conducive to groove structure forming.
[0026] As a further improvement, the cutting device includes an active cutting blade, a cutting drive device for driving the active cutting blade to move, and two cooperating cutting blades. The two cooperating cutting blades are located on both sides of the active cutting blade, and the cutting edges of the two cooperating cutting blades are respectively used to cooperate with the cutting edges on both sides of the active cutting blade to cut off the part of the workpiece blank located between the two cooperating cutting blades. The width of the main cutting blade is greater than the width of the slit portion used by the slit cutting device to cut out the deformation joint.
[0027] The beneficial effects are as follows: In the above technical solution, after the main cutting blade and the cooperating cutting blade move towards each other, the original workpiece blank can be cut into finished workpieces, scrap material, and remaining workpiece blanks. During the stamping process of forming a grooved structure, the distance between the two side walls of the expansion joint will continue to increase. If the finished workpiece is cut off directly, the end of the finished workpiece will be uneven. By using the above technical solution, the edge trimming operation of the skin end face is completed while cutting off the finished workpiece, and the rear end face of the finished workpiece and the front end face of the remaining workpiece blank will be smoother to meet the usage requirements.
[0028] As a further improvement, at least one side of the stamping punch is elastically provided with a pressure member for cooperating with the stamping die during the stamping process to clamp the workpiece blank, the pressure member having a pressure surface adapted to the shape of the workpiece blank.
[0029] The beneficial effects are: in the process of stamping the slotted structure by cooperating with the stamping die to form the slotted structure, the blank holder will press the workpiece blank tightly with the stamping die, thereby ensuring the stability of the workpiece blank during the processing and ensuring the quality of stamping. Attached Figure Description
[0030] Figure 1 This is a top view of the finished workpiece in this invention;
[0031] Figure 2 This is a cross-sectional view of the finished workpiece in this invention;
[0032] Figure 3 This is a schematic diagram of the folded edge structure at the end of the finished workpiece in this invention;
[0033] Figure 4 This is a schematic diagram from another perspective of the folded edge structure at the end of the finished workpiece in this invention;
[0034] Figure 5 This is a schematic diagram of the overall structure of the metal sheet forming equipment in this invention;
[0035] Figure 6 This is a schematic diagram of the slit unit of the metal sheet forming equipment in this invention;
[0036] Figure 7 This is a diagram illustrating the working process of the slit cutting unit in the metal sheet forming equipment of this invention.
[0037] Figure 8 This is a schematic diagram of the deformation joint structure of the cutting unit of the metal sheet forming equipment in this invention after cutting the workpiece blank;
[0038] Figure 9 This is a schematic diagram of the forming unit of the metal sheet forming equipment in this invention;
[0039] Figure 10 This is a diagram illustrating the working process of the forming unit in the metal sheet forming equipment of the present invention.
[0040] Figure 11 This is a schematic diagram of the deformation position of the workpiece blank after forming by the forming unit of the metal sheet forming equipment in this invention;
[0041] Figure 12 This is a cross-sectional view of the cutting unit of the metal sheet forming equipment in this invention;
[0042] Figure 13 This is a diagram illustrating the working process of the cutting unit in the metal sheet forming equipment of the present invention.
[0043] Explanation of reference numerals in the attached figures:
[0044] 1. Finished workpiece; 2. Folded structure; 3. Reinforcing rib; 4. Ω-shaped structure; 5. Frame; 6. Cutting unit; 61. Cutting support; 62. Cutting die; 63. Main cutting punch; 64. Auxiliary cutting punch; 65. Main cutting drive device; 66. Auxiliary cutting drive device; 67. Auxiliary support; 68. Through groove; 69. Mating groove; 7. Forming unit; 71. Stamping support; 72. Stamping punch; 73. Stamping die; 74. Stamping drive device; 75. Blanking part; 76. Blanking surface; 77. Support plate; 8. Cutting unit; 81. Cutting support; 82. Mating cutting blade; 83. Active cutting blade; 84. Cutting drive device; 9. Workpiece blank. Detailed Implementation
[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0046] The present invention will be further described in detail below with reference to the embodiments.
[0047] Specific embodiment 1 of the metal sheet forming equipment provided by the present invention:
[0048] See appendix Figure 5 A metal sheet forming device includes a rolling unit, a forming unit 7 and a cutting unit 8 arranged sequentially along the moving direction of the workpiece blank, wherein the forming unit 7 and the cutting unit 8 are both mounted on the same frame 5.
[0049] The roll forming unit is used to roll-form the workpiece blank into the shape of the main body. The roll forming unit is existing technology and will not be described in detail here. In addition to forming the workpiece blank, the roll forming unit can also provide driving force for the movement of the skin. In this invention, the forward direction of the workpiece blank is referred to as the front, and the length direction of the workpiece blank, i.e., the longitudinal direction, is the same as the front-back direction.
[0050] See appendix Figure 9 The forming unit 7 includes a stamping device, which includes a stamping support 71, a stamping punch 72 and a stamping die 73 that cooperate with each other on the stamping support 71, and the parting surface of the stamping punch 72 and the stamping die 73 is adapted to the cross-sectional shape of the workpiece blank. In other embodiments, the stamping device may also be provided as two or more, so that the end of the finished workpiece has two or more folded structures as needed.
[0051] The stamping die 73 is fixedly connected to the upper part of the stamping support 71, and the stamping punch 72 is located below the stamping die 73. The stamping support 71 is provided with a stamping drive device 74 for driving the stamping punch 72 to move upward so as to cooperate with the stamping die 73 to stamp the workpiece blank into a groove-shaped structure. In this embodiment, one implementation of the stamping drive device 74 is a hydraulic cylinder; in other implementations, the stamping drive device 74 can also be a pneumatic cylinder.
[0052] See appendix Figure 12The cutting unit 8 includes a cutting bracket 81, on which a cooperating cutting blade 82 is fixedly mounted. The cutting bracket 81 also includes an active cutting blade 83 and a cutting drive device 84 for driving the active cutting blade 83 to rise and fall. In one embodiment, the cutting drive device 84 is a hydraulic cylinder; in other embodiments, it can be a pneumatic cylinder. The cutting edge of the active cutting blade 83 and the cutting edge of the cooperating cutting blade 82 can form a shearing engagement, thereby cutting the workpiece blank. The cutting edge shapes of both the active cutting blade 83 and the cooperating cutting blade 82 are adapted to the cross-sectional shape of the workpiece blank.
[0053] In other embodiments, the cutting unit 8 may also be a saw or a flying saw.
[0054] This sheet metal forming equipment first uses a roller pressing unit to form a structure extending longitudinally along the workpiece blank, such as reinforcing ribs on the skin and Ω-shaped structures at the edges, and can drive the workpiece blank to move. After the workpiece blank leaves the roller pressing unit, a groove structure is stamped at forming unit 7. The sidewalls and bottom wall of the groove structure, as well as the part of the workpiece blank connected to the sidewall of the groove structure, together form a Z-shaped structure. Finally, the cutting unit 8 cuts the workpiece blank laterally from the groove structure, and the rear end of the final finished workpiece and the front end of the remaining workpiece blank, i.e., the front end of the next finished workpiece, form the required folded edge structure. Compared with the prior art, this sheet metal forming equipment can form two required folded edge structures in one stamping device at a time, without the need for two stamping processes, effectively improving production efficiency. Furthermore, the workpiece blank can be driven by the roller pressing unit from the roller pressing unit to the forming unit 7 and then to the cutting unit 8, eliminating the need for workers to transfer materials, reducing the labor intensity of workers, and achieving high production efficiency and easy automation.
[0055] The metal sheet forming equipment provided by this invention can not only process the roof side skin of buses, but also process other vehicle body skins, equipment shells, or other mechanical structures made of metal sheets that have similar structures to the roof side skin of buses.
[0056] Specific embodiment 2 of the metal sheet forming equipment provided by the present invention:
[0057] See appendix Figure 5 A metal sheet forming device includes a roller pressing unit, a slitting unit 6, a forming unit 7 and a cutting unit 8 arranged sequentially along the moving direction of the workpiece blank, wherein the forming unit 7, the slitting unit 6 and the cutting unit 8 are all mounted on the same frame 5.
[0058] The structure of the rolling unit, forming unit 7 and cutting unit is shown in Example 1.
[0059] See appendix Figure 6 The cutting unit 6 includes a cutting device for cutting deformation joints on the side of the workpiece blank.
[0060] The slitting device includes a slitting bracket 61, on which a slitting die 62 for supporting the workpiece blank is fixedly mounted. The slitting bracket 61 is also provided with a main slitting punch 63 and a main slitting drive device 65 for driving the main slitting punch 63 to move, an auxiliary slitting punch 64 and an auxiliary slitting drive device 66 for driving the auxiliary slitting punch 64 to move.
[0061] The main cutting punch 63 is located above the cutting die 62. Two auxiliary cutting punches 64 are provided and located on both sides of the main cutting punch 63. The main cutting drive device 65 drives the main cutting punch 63 to move up and down, and the auxiliary cutting drive device 66 drives the auxiliary cutting punches 64 to move horizontally. Both the main cutting drive device 65 and the auxiliary cutting drive device 66 are hydraulic cylinders, and in other embodiments, they can both be pneumatic cylinders.
[0062] An auxiliary support 67 is fixedly installed at the output end of the auxiliary slit drive device 66. A through groove 68 for the main slit punch 63 to pass through is opened in the middle of the auxiliary support 67. The auxiliary slit punch 64 is fixedly installed on the auxiliary support 67. The side walls of the auxiliary slit punch 64 that are close to each other are flush with the corresponding side walls of the through groove 68.
[0063] The slit die 62 has a mating groove 69 formed on it for cooperating with the main slit punch 63 and the auxiliary slit punch 64 to cut out the deformation joint. The mating groove 69 has a T-shaped structure.
[0064] The slitting die 62, the main slitting punch 63, and the auxiliary slitting punch 64 all have mating surfaces that adapt to the shape of the workpiece blank to ensure that the workpiece blank does not deform during the slitting process.
[0065] The working process of the slit cutting unit 6 is shown in the appendix. Figure 7 First, the workpiece blank 9 needs to be cut at the position of the cutting die 62. At this time, the cutting die 62 provides support for the workpiece blank 9. Figure 7 As shown in Figure a. Then, the main cutting punch 63 cuts out the narrow section of the deformation seam, while the auxiliary cutting punch 64 cuts out the wide section of the deformation seam. This facilitates easier deformation of the skin on both sides of the deformation seam during subsequent stamping deformation. This process is as follows: Figure 7 As shown in b. Finally, the main cutting punch 63 and the auxiliary cutting punch 64 are reset, completing the cutting operation, as shown in Figure b. Figure 7 As shown in c. The workpiece blank after processing by the kerf unit is as follows. Figure 8As shown. Because the edges of the skin have curved sections, some parts of the skin's edges form a larger angle with the movement direction of the main cutting punch 63, making it easy to punch out deformation seams; while other parts have a smaller angle with the movement direction of the main cutting punch 63, making it difficult to punch out deformation seams effectively using the main cutting punch 63. By using the auxiliary cutting punch 64, the above problems can be effectively solved, and deformation seams can be punched out effectively even in the parts with smaller angles with the movement direction of the main cutting punch 63.
[0066] In other embodiments, only one auxiliary cutting punch 64 is provided.
[0067] In other embodiments, the auxiliary cutting punch 64 is not provided, and the cross-sectional shape of the main cutting punch 63 is a T-shaped structure adapted to the shape of the mating groove 69.
[0068] In other embodiments, the auxiliary cutting punch 64 is not provided, and the cross-sectional shape of the main cutting punch 63 and the cross-sectional shape of the mating groove 69 are both straight structures. In this embodiment, the deformation joint has no wide section.
[0069] In this embodiment, after the workpiece blank leaves the rolling unit, a laterally extending deformation seam is first formed on the side of the workpiece blank using the slit cutting unit 6. Then, the forming unit 7 is used to stamp and form a groove-shaped structure, and finally, the cutting unit 8 is used to cut it to obtain the finished workpiece. Because a deformation seam is formed on the workpiece blank, the bottom of the groove-shaped structure can flow freely towards the corresponding sidewall during the stamping and forming process, preventing the main body of the workpiece blank connected to the sidewall of the groove-shaped structure from being stretched and deformed, thus reducing its thickness and affecting the overall quality of the workpiece blank.
[0070] Specific embodiment 3 of the metal sheet forming equipment provided by the present invention:
[0071] See appendix Figure 5 A metal sheet forming device includes a roller pressing unit, a slitting unit 6, a forming unit 7 and a cutting unit 8 arranged sequentially along the moving direction of the workpiece blank, wherein the forming unit 7 and the cutting unit 8 are both mounted on the same frame 5.
[0072] The structures of the rolling unit, the slit cutting unit, and the forming unit 7 are described in Example 2.
[0073] See appendix Figure 12 The cutting unit 8 includes a cutting bracket 81, on which two mating cutting blades 82 are fixedly mounted. Each of the two mating cutting blades 82 has a through hole for the workpiece blank to pass through, and the shape of the through hole is adapted to the cross-sectional shape of the workpiece blank. The edge of the lower sidewall of the through hole is the cutting edge of the mating cutting blade 82.
[0074] The cutting bracket 81 is also equipped with an active cutting blade 83 and a cutting drive device 84 for driving the active cutting blade 83 to rise and fall. In one embodiment, the cutting drive device 84 is a hydraulic cylinder; in other embodiments, the cutting drive device 84 can also be a pneumatic cylinder. The lower ends of the active cutting blade 83 are both edges of its cutting edge, and the cutting edge of the active cutting blade 83 is adapted to the cross-sectional shape of the workpiece blank. The active cutting blade 83 is located between two mating cutting blades 82 and slides in contact with the mating cutting blades 82. During the downward movement of the active cutting blade 83, its cutting edge can form a shearing engagement with the cutting edge of the mating cutting blades 82, thereby cutting off the portion of the workpiece blank located between the two mating cutting blades 82.
[0075] See appendix Figure 13 The process of cutting the skin using the cutting unit 8 is as follows: first, the workpiece blank 9 is moved into position, such as... Figure 13 As shown in Figure a; then the active cutting blade 83 moves down to cooperate with the cooperating cutting blade 82, cutting the original workpiece blank 9 into finished workpieces, scrap material, and remaining workpiece blanks, as shown in Figure a. Figure 13 As shown in b. Finally, the active cutting blade 83 moves upward and resets, as shown in Figure 8. Figure 13 As shown in Figure c, during the stamping process to form the grooved structure, the distance between the two side walls of the expansion joint will continue to increase. If the finished workpiece is directly cut off, the end of the finished workpiece will be uneven. The above technical solution not only cuts off the finished workpiece but also trims the skin end face, resulting in a smoother rear end face of the finished workpiece and a smoother front end face of the remaining workpiece blank, thus meeting the usage requirements.
[0076] Specific embodiment 4 of the metal sheet forming equipment provided by the present invention:
[0077] See appendix Figure 5 A metal sheet forming device includes a rolling unit, a forming unit 7 and a cutting unit 8 arranged sequentially along the moving direction of the workpiece blank, wherein the forming unit 7 and the cutting unit 8 are both mounted on the same frame 5.
[0078] The structure of the rolling unit and the cutting unit 8 is shown in Example 1.
[0079] See appendix Figure 9 The forming unit 7 includes a stamping device, which includes a stamping support 71, a stamping punch 72 and a stamping die 73 that cooperate with each other on the stamping support 71, and the parting surface of the stamping punch 72 and the stamping die 73 is adapted to the cross-sectional shape of the workpiece blank.
[0080] The stamping die 73 is fixedly connected to the upper part of the stamping support 71, and the stamping punch 72 is located below the stamping die 73. The stamping support 71 is provided with a stamping drive device 74 for driving the stamping punch 72 to move upward so as to cooperate with the stamping die 73 to stamp the workpiece blank into a groove-shaped structure. In this embodiment, one implementation of the stamping drive device 74 is a hydraulic cylinder; in other implementations, the stamping drive device 74 can also be a pneumatic cylinder.
[0081] Both sides of the stamping punch 72 are provided with blank holders 75 for clamping the workpiece blank during the stamping process. The blank holders 75 have blank holder surfaces 76 that are adapted to the shape of the workpiece blank. A support plate 77 is fixedly provided at the lower part of the stamping punch 72. The support plate 77 is formed with multiple guide holes. A guide post is fixedly provided on the lower end face of the blank holder 75 for guiding and cooperating with the guide holes. Multiple thrust springs are also fixedly connected between the blank holder 75 and the support plate 77.
[0082] Without external force, the blank holder surface 76 of the blank holder 75 is flush with the upper surface of the stamping punch 72. The working process of the forming unit 7 is described in the appendix. Figure 10 First, the Ω-shaped structure of the workpiece blank 9 is fitted onto the stamping die 73 and moved into place, as follows: Figure 10 As shown in diagram a; then, the stamping punch 72 moves upward, and the stamping punch 72 and the blank holder 75 simultaneously come into contact with the workpiece blank 9. The blank holder 75 and the stamping die 73 together clamp the workpiece blank 9 as shown in diagram a. Figure 10 As shown in b; then, the stamping punch 72 continues to move upward and embeds into the stamping die 73 to perform stamping forming. The blank holder 75, together with the stamping die 73, will press the workpiece blank tightly to prevent it from moving, ensuring the stability of the workpiece blank during the stamping forming process and improving the forming effect of the workpiece blank, such as... Figure 10 As shown in c; finally, the forming punch 72 and the blank holder 75 move down and reset, as shown in c. Figure 10 As shown in d. The deformation position of the workpiece unit after the forming unit forms the workpiece blank is as follows. Figure 11 As shown.
[0083] During the process of stamping the slotted structure by cooperating with the stamping die 73, the blank holder 75 will press the workpiece blank tightly with the stamping die 73, thereby ensuring the stability of the workpiece blank during the processing and ensuring the quality of stamping.
[0084] Specific embodiment 5 of the metal sheet forming equipment provided by the present invention:
[0085] See appendix Figure 5A metal sheet forming device includes a roller pressing unit, a slitting unit 6, a forming unit 7 and a cutting unit 8 arranged sequentially along the moving direction of the workpiece blank, wherein the forming unit 7, the slitting unit 6 and the cutting unit 8 are all mounted on the same frame 5.
[0086] The structures of the rolling unit, the slit cutting unit 6, and the cutting unit 8 are described in Example 2, and the structure of the forming unit 7 is described in Example 4.
[0087] Specific embodiment 1 of the metal sheet forming method provided by the present invention:
[0088] A method for forming metal sheets involves first using a roll forming device to continuously roll form a workpiece blank that extends longitudinally, then stamping a groove-shaped structure that extends laterally onto the workpiece blank, then transversely cutting the workpiece blank and passing the cut surface through the groove-shaped structure to finally obtain a finished workpiece. After cutting, a part of the groove-shaped structure constitutes the folded edge structure at the end of the finished workpiece, and another part constitutes the folded edge structure at the end of the remaining workpiece blank. The above operation is repeated on the remaining workpiece blank.
[0089] The sidewalls and bottom walls of the groove-shaped structure formed on the workpiece blank, along with the workpiece blank portion connected to the sidewalls of the groove-shaped structure, together constitute a Z-shaped structure. Therefore, when the final finished workpiece is cut off, its rear end and the front end of the remaining workpiece blank (i.e., the front end of the next finished workpiece segment) will form the required folded edge structure. After repeating the above operation, both ends of each finished workpiece segment will form the required folded edge structure. Compared with existing technologies, this metal sheet forming method can obtain two folded edge structures in a single stamping process, ensuring that both ends of the finished workpiece have the required folded edge structure when it is cut off from the remaining workpiece blanks. This eliminates the need to transfer the sheet metal to other stations for further processing, effectively improving production efficiency. Between the finished workpiece being cut off from the remaining workpiece blanks, the workpiece blanks can be moved between different stations by a rolling mill, ensuring production efficiency while reducing the labor intensity of workers.
[0090] The metal sheet forming method provided by this invention can not only process the roof side skin of buses, but also process other vehicle body skins, equipment shells, or other mechanical structures made of metal sheets that have similar structures to the roof side skin of buses.
[0091] Specific embodiment 2 of the metal sheet forming method provided by the present invention:
[0092] A method for forming a thin metal sheet involves first continuously rolling a workpiece blank extending longitudinally using a roll forming device, then cutting a transversely extending deformation seam on the workpiece blank, followed by stamping a transversely extending groove structure on the workpiece blank, then transversely cutting the workpiece blank and passing the cross-section through the groove structure to finally obtain a finished workpiece. After cutting, a part of the groove structure constitutes the folded edge structure at the end of the finished workpiece, and another part constitutes the folded edge structure at the end of the remaining workpiece blank. The above operations are repeated on the remaining workpiece blank.
[0093] In the above process, the length of the expansion joint is greater than or equal to the length of the groove structure. During the process of cutting out the expansion joint, the part of the workpiece blank edge that is not stamped into a groove structure is also cut off, forming an expansion joint containing a wide section and a narrow section, wherein the wide section corresponds to the part that is not stamped into a groove structure.
[0094] After forming an expansion joint on the workpiece blank, the workpiece blank on both sides of the expansion joint can undergo more free plastic flow during the stamping process to form a groove structure. This prevents the main body of the workpiece blank from being stretched and deformed, thus reducing its thickness and affecting the overall quality of the workpiece blank. Furthermore, since the groove structure is not formed in the wide section, the workpiece blank on both sides of the wide section exerts less strain and restriction on the plastic flow of the material during the forming of the groove structure, which is more conducive to the forming of the groove structure.
[0095] Specific embodiment 3 of the metal sheet forming method provided by the present invention:
[0096] A method for forming thin metal sheets involves first continuously rolling a workpiece blank using a roll forming machine, then transversely cutting deformation seams into the workpiece blank, followed by stamping the workpiece blank to form a groove-shaped structure, and finally transversely cutting the workpiece blank. After cutting, the sidewalls of the groove-shaped structure form folded edges at the rear end of the finished workpiece and the front end of the remaining workpiece blank. The roll forming, deformation seam cutting, and groove-shaped structure forming methods are described in Example 1.
[0097] The method for transversely cutting the workpiece blank is to cut two cross sections in the transverse direction, thereby dividing the original workpiece blank into finished workpiece, scrap material and remaining workpiece blank. The width of the scrap material is greater than the width of the expansion joint.
[0098] During the stamping process of forming a grooved structure, the distance between the two side walls of the expansion joint will continue to increase. If the finished workpiece is cut off directly, the end of the finished workpiece will be uneven. This metal sheet forming method not only cuts off the finished workpiece but also completes the edge trimming operation of the skin end face. The rear end face of the finished workpiece and the front end face of the remaining workpiece blank will be smoother to meet the usage requirements.
[0099] Specific embodiment 4 of the metal sheet forming method provided by the present invention:
[0100] A method for forming thin metal sheets involves first continuously rolling a workpiece blank using a roll forming machine, then transversely cutting deformation seams into the workpiece blank, followed by stamping the workpiece blank to form a groove-shaped structure, and finally transversely cutting the workpiece blank. After cutting, the sidewalls of the groove-shaped structure form folded edges at the rear end of the finished workpiece and the front end of the remaining workpiece blank. The roll forming, deformation seam cutting, and groove-shaped structure forming methods are described in Example 1.
[0101] In this embodiment, the formed groove structure is symmetrical about the expansion joint.
[0102] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for forming a thin metal sheet, characterized in that, First, a workpiece blank extending longitudinally is continuously rolled using a roll forming equipment. Then, a deformation seam with a certain width and extending laterally is obtained on the workpiece blank by stamping and cutting. Next, a groove-shaped structure extending laterally is stamped on the workpiece blank at the position corresponding to the deformation seam. Then, the workpiece blank is cut laterally and the cross-section passes through the groove-shaped structure to finally obtain the finished workpiece. After cutting, part of the groove-shaped structure constitutes the folded edge structure at the rear end of the finished workpiece, and the other part constitutes the folded edge structure at the front end of the remaining workpiece blank, i.e., the front end of the next section of the finished workpiece. The above operation is repeated on the remaining workpiece blank.
2. The metal sheet forming method according to claim 1, characterized in that, The length of the expansion joint is greater than or equal to the length of the trough structure.
3. The metal sheet forming method according to claim 2, characterized in that, in During the process of cutting out the deformation joint, the part of the workpiece blank edge that is not stamped into a groove structure is also cut off, forming a deformation joint containing a wide joint segment and a narrow joint segment, wherein the wide joint segment corresponds to the part that is not stamped into a groove structure.
4. The metal sheet forming method according to claim 2 or 3, characterized in that the workpiece The method of transverse cutting of the billet is to cut two cross sections in the transverse direction to divide the original workpiece billet into finished workpiece, scrap material and remaining workpiece billet. The width of the scrap material is greater than the width of the expansion joint.
5. The method for forming metal sheets according to claim 2 or 3, characterized in that, The formed trough structure is symmetrical about the expansion joint.
6. A metal sheet forming equipment, characterized in that, The assembly includes a rolling unit, a slitting unit, a forming unit, and a cutting unit arranged sequentially along the moving direction of the workpiece blank. The slitting unit includes at least one slitting device for obtaining a deformation slit of a certain width on the workpiece blank by stamping and cutting. The forming unit includes at least one stamping device for forming a groove-shaped structure on the workpiece blank at the position corresponding to the deformation slit. The stamping device includes a stamping punch and a stamping die whose parting surface is adapted to the cross-sectional shape of the workpiece blank. The cutting unit includes a cutting device for transversely cutting the workpiece blank from the groove-shaped structure to obtain a finished workpiece. After cutting, a part of the groove-shaped structure constitutes the folded edge structure at the rear end of the finished workpiece, and the other part constitutes the folded edge structure at the front end of the remaining workpiece blank, i.e., the front end of the next section of the finished workpiece.
7. The metal sheet forming equipment according to claim 6, characterized in that, The slit cutting device includes a slit cutting die for supporting the workpiece blank, a main slit cutting punch, an auxiliary slit cutting punch, a main slit driving device for driving the main slit cutting punch, and an auxiliary slit driving device for driving the auxiliary slit cutting punch. At least one auxiliary slit cutting punch is provided and is used to cut off the part of the workpiece blank edge that is not stamped into a groove structure to form a wide slit segment. The main slit cutting punch is used to cut out a narrow slit segment. The wide slit segment and the narrow slit segment together form the deformation slit.
8. The metal sheet forming equipment according to claim 7, characterized in that, The slitting die, the main slitting punch, and the auxiliary slitting punch all have mating surfaces that adapt to the shape of the workpiece blank. During use, the main slitting punch moves vertically, and the auxiliary slitting punch moves horizontally.
9. The metal sheet forming equipment according to claim 7, characterized in that, The cutting device includes an active cutting blade, a cutting drive device for driving the active cutting blade to move, and two cooperating cutting blades. The two cooperating cutting blades are located on both sides of the active cutting blade, and the cutting edges of the two cooperating cutting blades are respectively used to cooperate with the cutting edges on both sides of the active cutting blade to cut off the part of the workpiece blank located between the two cooperating cutting blades. The width of the main cutting blade is greater than the width of the slit portion used by the slit cutting device to cut out the deformation joint.
10. The metal sheet forming equipment according to any one of claims 6-9, characterized in that, At least one side of the stamping punch is elastically provided with a pressure member for cooperating with the stamping die during the stamping process to clamp the workpiece blank. The pressure member has a pressure surface adapted to the shape of the workpiece blank.