Stamping die structure for secondary bending of sheet material with bending structure
By introducing a design in the die structure that allows the lower die to simultaneously push the forming insert against the side wall of the sheet metal and automatically return it to its original position, combined with the forming plate matching the original bending structure, the problem of sheet metal deformation caused by secondary bending is solved, achieving efficient production and cost reduction.
Patent Information
- Application Number
- CN202520102479.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-16
AI Technical Summary
When bending structural plate components in a secondary bending process, existing technologies often result in changes in the internal stress distribution of the plate, leading to deformation of the existing bent structure. This process is complex and costly.
Design a punching die structure in which the lower die pushes and presses against the secondary bending sidewall of the sheet metal simultaneously through the forming insert and elastic component during the die closing process, and automatically returns to its original position before the die opens. Combined with the forming plate, it presses against the original bending structure to avoid deformation and replace the subsequent forming process.
It improved production efficiency, reduced production costs, ensured the accuracy of secondary bending and geometrical positioning, and simplified the production process.
Smart Images
Figure CN223761938U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of stamping die technology, and in particular to a stamping die structure for a double-bending plate material with a bending structure. Background Technology
[0002] Bending sheet metal is a common structure on stamping dies. Generally, it's formed by directly stamping with a suitable punch on the upper die. However, for sheet metal that already has a bent structure in the area to be bent, the secondary bending operation may cause changes in the internal stress distribution of the sheet metal, leading to deformation of the existing bent structure. Therefore, in production, a shaping process is usually set up after the secondary bending process. This process arrangement is relatively complex and the production cost is high. Utility Model Content
[0003] To address the problems existing in the prior art, this utility model provides a punching die structure for a secondary bending sheet metal part with a bending structure. This structure allows the lower die to simultaneously push the forming insert onto the lower die during the die closing process, thereby abutting the sidewall of the sheet metal after the secondary bending and ensuring bending accuracy. Furthermore, it can automatically pull the forming insert back into position during the early stage of die opening, ensuring that the die will not damage the sheet metal during opening and that the sheet metal can be smoothly removed from the lower die. During die closing, it can match and abut the original bending structure on the sheet metal, preventing deformation during the secondary bending operation and ensuring its shape and position accuracy. This structure can replace the original subsequent shaping process, improving production efficiency and reducing production costs.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0005] A punching die structure for a double-bending sheet metal part with a bending structure, the punching die having an upper die and a lower die, the upper die having an upper die base, an upper template, and a punch, and the lower die having a lower template, a forming insert, and a lower die base, the upper template and the lower template respectively fitting to the upper and lower ends of the sheet metal; wherein:
[0006] The upper mold is also provided with a stop plate and an upper ejector plate: the stop plate is movably disposed below the upper mold base and is slidably connected to the upper mold base through an upper limit member extending along the mold closing direction; the upper ejector plate and the upper template are both fixedly disposed at the lower end of the stop plate; the punch is disposed on the side of the upper template and is detachably fixedly connected to the upper mold base.
[0007] The lower die is further provided with a lower ejector plate, a lower clamping plate, a shaping plate, and a lower insert: the lower clamping plate is located above the lower die base and is slidably connected to the lower die base via a lower limiting member extending along the die closing direction; the lower ejector plate is fixed to the lower template, and the lower template is fixed to the lower clamping plate; the shaping plate and the lower insert are detachably fixed to the lower die base; the lower insert extends along the die closing direction to the side of the forming insert and is slidably connected to its inclined side wall; the forming insert is horizontally located at the lower end of the lower ejector plate and is slidably connected to it; the lower template is provided with a horizontal elastic member, which is drively connected to the forming insert; the lower insert can push the forming insert to slide on the lower ejector plate to approach the sheet metal when the die is closed; the elastic member can pull the forming insert to slide on the lower ejector plate to reset when the die is opened; the shaping plate is located beside the lower template and is detachably fixed to the lower die base, and is located below the punch.
[0008] As a further explanation of the above technical solution:
[0009] In the above technical solution, both the upper limit component and the lower limit component include a nitrogen spring and an equal-height sleeve screw.
[0010] In the above technical solution, the upper end of the shaping plate is formed with a protrusion that matches the original bending structure on the plate.
[0011] In the above technical solution, the forming insert includes a sliding part and a forming part. The forming part is detachably fixed on the side wall of the sliding part near the shaping plate. The sliding part is located beside the lower template and its upper end is slidably connected to the lower stripper plate. One side wall of the sliding part is located above the lower insert, and both of the opposite ends are formed with inclined surfaces.
[0012] In the above technical solution, the lower clamp plate is also provided with a slide rail adapted to the sliding part.
[0013] In the above technical solution, the elastic component is a horizontally arranged pull rod with a spring sleeved on it. One end of the pull rod is detachably fixed to the sliding part, and the other end is slidably connected to the lower template.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a lower limit member and a lower insert and elastic component connected to the forming insert in the lower mold, the forming insert can be pushed horizontally on the lower mold during the mold closing process to abut against the side wall of the sheet metal after the secondary bending, ensuring the accuracy of the secondary bending. It can also automatically pull the forming insert back to its original position in the early stage of the mold opening action to avoid damage to the sheet metal during the mold opening process and to remove the sheet metal smoothly from the lower mold. By setting a shaping plate, it can match and abut against the original bending structure on the sheet metal during the mold closing process, preventing it from deforming during the secondary bending operation, ensuring its shape and position accuracy, and replacing the original subsequent shaping process, improving production efficiency and reducing production costs. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the sheet metal structure before and after bending in the embodiment;
[0016] Figure 2 This is a schematic diagram of the structure in the mold-open state of this embodiment;
[0017] Figure 3 This is a schematic diagram of the structure of the punch, forming insert, shaping plate and elastic component in this embodiment.
[0018] In the picture:
[0019] 100. Upper die; 10. Upper die base; 20. Stop plate; 30. Upper ejector plate; 40. Upper template; 200. Lower die; 50. Lower ejector plate; 60. Lower template; 70. Lower clamping plate; 80. Shaping plate; 90. Lower die base; 1. Punch; 2. Forming insert; 201. Sliding part; 202. Forming part; 3. Upper limit component; 4. Lower insert; 5. Lower limit component; 6. Elastic component; 601. Spring; 602. Tie rod; 7. Protrusion; 8. Inclined surface; 9. Slide rail; a. Nitrogen spring; b. Equal height sleeve screw. Detailed Implementation
[0020] The present invention will now be described in further detail with reference to the accompanying drawings.
[0021] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0022] For ease of understanding, Figure 1 The diagram shows the structure of the sheet metal before and after stamping in this utility model. It can be seen that the end of the sheet metal to be bent originally has a structure that bends inward and downward. The conventional structure of the upper die punch and the lower die insert cannot protect the original bending structure during the die closing and opening process. It is often necessary to reshape the original bending structure and the bending structure in this process after this process, which is more complicated and has higher production costs.
[0023] like Figure 2As shown, the die structure for a double-bending sheet metal part with a bending structure includes an upper die 100 and a lower die 200. The upper die 100 includes an upper die base 10, an upper template 40, and a punch 1. The lower die 200 includes a lower template 60, a forming insert 2, and a lower die base 90. The upper template 40 and the lower template 60 are respectively adapted to the upper and lower ends of the sheet metal.
[0024] The upper mold 100 is also provided with a stop plate 20 and an upper ejector plate 30: the stop plate 20 is movably disposed below the upper mold base 10 and is slidably connected to the upper mold base 10 through an upper limit member 3 extending along the mold closing direction; the upper ejector plate 30 and the upper template 40 are both fixedly disposed at the lower end of the stop plate 20; the punch 1 is disposed on the side of the upper template 40 and is detachably fixedly connected to the upper mold base 10;
[0025] The lower mold 200 is also provided with a lower ejector plate 50, a lower clamping plate 70, a shaping plate 80, and a lower inserter 4. The lower clamping plate 70 is located above the lower mold base 90 and is slidably connected to the lower mold base 90 through a lower limiting member 5 extending along the mold closing direction. The lower ejector plate 50 is fixedly mounted on the lower template 60, and the lower template 60 is fixedly mounted on the lower clamping plate 70. The shaping plate 80 and the lower inserter 4 are detachably fixedly connected to the lower mold base 90. The lower inserter 4 extends along the mold closing direction to the side of the forming insert 2 and is slidably connected to its inclined side wall. The forming insert 2 is horizontally positioned at the lower end of the lower ejector plate 50 and slidably connected to it. A horizontal elastic component 6 is provided on the lower template 40. The elastic component 6 is connected to the forming insert 2 in a transmission manner. The lower insert 4 can push the forming insert 2 to slide on the lower ejector plate 50 to approach the sheet metal when the mold is closed. The elastic component 6 can pull the forming insert 2 to slide on the lower ejector plate 50 to reset when the mold is opened. The shaping plate 80 is located on the side of the lower template 60 and is detachably fixed to the lower mold base 90. The shaping plate 80 is located below the punch 1.
[0026] At work, such as Figure 2-3As shown, the sheet metal is placed on the lower die plate 60. The punch press pushes the upper die 100 to move toward the lower die 200 to close the mold. The upper ejector plate 30 and the upper die plate 40 first contact the lower ejector plate 50 and the lower die plate 60 respectively and press the sheet metal. Due to the movable connection of the lower limit member 5, the upper die 100 pushes the lower ejector plate 50, the lower die plate 60 and the lower clamping plate 70 to continue to move down and approach the lower die base 90, so that the lower insert 4 moves up relative to the forming insert 2 on the lower ejector plate 50. The inclined surfaces 8 of the two slide relative to each other, pushing the forming insert 2 to slide toward the forming plate 80 on the lower ejector plate 50 and the slide 9 and stretching the elastic member 6. Simultaneously, due to the upper limit member 3 (Nitrogen spring a) is connected to the upper mold base 10, which drives the punch 1 to move downward relative to the stop plate 20, the upper stripper plate 30 and the upper template 40 and punch and bend the sheet metal. Under the action of the upper limit member 3 and the lower limit member 5, the lower stripper plate 50, the lower template 60 and the lower clamping plate 70 move downward relative to the lower mold base 90 to the set position, and the stop plate 20, the upper stripper plate 30 and the upper template 40 move relative to the upper mold base 10 to the set position, completing the mold closing and bending action. At this time, the original bending structure on the sheet metal is exactly against the protrusion 7 of the forming plate 80, and the forming part 202 on the forming insert 2 is exactly against the inner wall of the new bending structure. When the mold is opened, the upper mold 100 moves upward. The lower limit component 5 (nitrogen spring) first pushes the lower clamping plate 70 to move the lower template 60 and the lower ejector plate 50 away from the lower mold base 90. The lower insert 4 moves downward relative to the lower ejector plate 50 and leaves the forming insert 2. The elastic component 6 pulls the forming insert 2 to slide away from the sheet metal on the lower ejector plate 50 and return to its original position. After the lower ejector plate 50 moves upward a certain distance and returns to its original position, the upper ejector plate 30 and the upper template 40 continue to press the sheet metal. The upper mold base 10 pulls the punch 1 to move upward a set distance and then pulls the stop plate 20 to move the upper ejector plate 30 and the upper template 40 away from the lower mold, completing the demolding action.
[0027] This invention, by setting a lower limit member 5, a lower insert 4 and an elastic component 6 connected to the forming insert 2 in a transmission manner on the lower mold 200, can realize that the lower mold 200 synchronously pushes the forming insert 2 to slide horizontally on the lower mold during the mold closing process to abut against the side wall of the sheet metal after secondary bending, ensuring the accuracy of secondary bending. It can also automatically pull the forming insert 2 back to its original position in the early stage of mold opening to avoid damage to the sheet metal during the mold opening process and to smoothly remove the sheet metal from the lower mold 200. By setting a shaping plate 80, it can match and abut against the original bending structure on the sheet metal during mold closing, preventing deformation during secondary bending operations and ensuring its shape and position accuracy. It can replace the original subsequent shaping process, improve production efficiency and reduce production costs.
[0028] In this embodiment, both the upper limit member 3 and the lower limit member 5 include a nitrogen spring a and a height-equalizing sleeve screw b; the upper end of the shaping plate 80 has a protrusion 7 that is adapted to the original bending structure on the plate.
[0029] like Figure 3As shown, the forming insert 2 includes a sliding part 201 and a forming part 202. The forming part 202 is detachably fixed to the side wall of the sliding part 201 near the shaping plate 80. The sliding part 201 is located beside the lower template 60 and its upper end is slidably connected to the lower ejector plate 50. One side wall of the sliding part 201 is located above the lower insert 4, and both of the opposite ends of the sliding part 201 have inclined surfaces 8. In order to further guide the sliding direction of the forming insert 2, the lower clamping plate 70 is also provided with a slide rail 9 adapted to the sliding part 201.
[0030] like Figure 3 As shown, the elastic component 6 is a horizontally arranged pull rod 602 with a spring 601 sleeved on it. One end of the pull rod 602 is detachably fixed to the sliding part 201, and the other end is slidably connected to the lower template 60.
[0031] The above does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.
Claims
1. A die structure for bending a sheet metal part with a secondary bending structure, the die structure comprising an upper die and a lower die, the upper die comprising an upper die holder, an upper die plate and a punch, the lower die comprising a lower die plate, a forming insert and a lower die holder, the upper die plate and the lower die plate being adapted to the upper end and the lower end of the sheet metal part, respectively, characterized in that: the upper die further comprises a stopper plate and an upper stripper plate, the stopper plate being movably arranged below the upper die holder and being slidably connected to the upper die holder by an upper limiting member extending in the closing direction, the upper stripper plate and the upper die plate being fixedly arranged at the lower end of the stopper plate, the punch being arranged beside the upper die plate and being detachably fixed to the upper die holder; the lower die further comprises a lower stripper plate, a lower clamping plate, a shaping plate and a lower insert, the lower clamping plate being arranged above the lower die holder and being slidably connected to the lower die holder by a lower limiting member extending in the closing direction, the lower stripper plate being fixedly arranged on the lower die plate, the lower die plate being fixedly arranged on the lower clamping plate, the shaping plate and the lower insert being detachably fixed to the lower die holder, the lower insert extending in the closing direction to the side of the forming insert and being slidably connected to the inclined side wall of the forming insert, the forming insert being horizontally arranged at the lower end of the lower stripper plate and being slidably connected to the lower stripper plate, the lower die plate being provided with a horizontal elastic member, the elastic member being drivingly connected to the forming insert, the lower insert being capable of pushing the forming insert to slide on the lower stripper plate to approach the sheet metal part when the die is closed, the elastic member being capable of pulling the forming insert to slide on the lower stripper plate to reset when the die is opened, the shaping plate being arranged beside the lower die plate and being detachably fixed to the lower die holder, the shaping plate being arranged below the punch. The upper limiting member and the lower limiting member each comprise a nitrogen spring and an equal-height sleeve screw. The upper end of the shaping plate is formed with a protrusion adapted to the original bending structure of the sheet metal part.
2. A die structure for bending a sheet metal piece of a two-folded belt bending structure according to claim 1, characterized in that, The forming insert comprises a sliding portion and a forming portion, the forming portion being detachably fixed to the side wall of the sliding portion close to the shaping plate, the sliding portion being arranged beside the lower die plate and having its upper end slidably connected to the lower stripper plate, one side wall of the sliding portion being arranged above the lower insert, and the end parts of the sliding portion and the lower insert each being formed with an inclined surface.
3. The die structure for bending a sheet metal piece of a two-folded belt bending structure according to claim 1, characterized in that, The lower clamping plate is further provided with a slide adapted to the sliding portion.
4. The die structure for bending a sheet metal piece of a two-folded belt bending structure according to claim 1, characterized by The elastic member is a horizontal pull rod provided with a spring, one end of the pull rod being detachably fixed to the sliding portion, and the other end being slidably connected to the lower die plate.
5. A die structure for bending a sheet metal part according to claim 4, wherein 6. The die structure for bending a sheet metal piece of a two-folded belt bending structure according to claim 4, characterized in that,