A metal box round corner bending forming jig

Abstract

The utility model provides a kind of metal box body fillet bending forming jig, including lower jig and upper jig, curved groove for making box body plate form fillet is equipped in the length direction of the upper part of the lower jig, the bottom of the upper jig is equipped with the stamping part matched with the curved groove along length direction.The utility model adopts the overall structure of upper and lower jig cooperation, and the right angle edge of metal plate can be quickly processed into smooth fillet by one stamping stroke, realizing one forming.Changes the inefficient mode of needing multiple bending to approach circular arc profile in traditional process, greatly improves production efficiency, and reduces the dependence on complex programming and debugging skills of operator.

Description

[Technical Field]

[0001] This utility model relates to the field of sheet metal processing technology, and in particular to a metal box rounded corner bending forming jig. [Background Technology]

[0002] In the production of metal enclosures such as chassis and cabinets, processing the right-angled edges of sheet metal into smooth rounded corners has become a mainstream process requirement for improving product quality, aesthetics, and safety.

[0003] Currently, the traditional method of achieving this rounded corner bending mainly relies on general-purpose CNC bending machines. However, this method usually requires operators to perform multiple small-angle continuous bends through complex programming to approximate an arc contour. This not only requires extremely high skills and experience from the workers, resulting in low processing efficiency and high economic costs, but also makes it difficult to guarantee the consistency and smoothness of the rounded corner contour in mass production, often accompanied by surface defects such as scratches or embossing.

[0004] Therefore, providing a specialized fixture capable of achieving efficient and stable one-time molding to overcome the shortcomings of the aforementioned general-purpose equipment processing methods is a problem that urgently needs to be solved in this field. [Utility Model Content]

[0005] The purpose of this utility model is to provide a metal box rounded corner bending forming fixture, which aims to solve the problems of low processing efficiency, unstable product quality, high operator skill requirements and high economic cost that exist when relying on general bending machines for rounded corner processing in the prior art.

[0006] This utility model is achieved through the following technical solution:

[0007] A metal box rounded corner bending forming fixture includes a lower fixture and an upper fixture. The lower fixture has a curved groove along the length of the upper part for forming rounded corners of the box sheet. The bottom of the upper fixture has a stamping part that matches the curved groove along the length of the upper part.

[0008] The metal box forming fixture described above with rounded corners has a semi-circular curved groove.

[0009] The metal box rounded corner bending forming fixture described above has a cylindrical cross-section for the stamping part that corresponds to the shape of the curved groove.

[0010] The metal box rounded corner bending forming fixture described above has the cross-sectional radius of the stamping part as R1 and the cross-sectional radius of the curved groove as R2. R1 and R2 satisfy the relationship: 1mm≤R2-R1≤3mm.

[0011] The metal box rounded corner bending forming fixture described above further includes a receiving section connected to the upper end of the stamping part, and the upper end of the receiving section is connected to an assembly part for fixing to the external structure.

[0012] The metal box rounded corner bending forming fixture described above includes a clamping part on one side of the upper end, a horizontal mounting groove on one side of the clamping part, and a right-angle notch on the other side of the clamping part.

[0013] The metal box rounded corner bending forming jig described above has a positioning groove provided along the length of the right angle notch inside corner to improve assembly accuracy and stability. The positioning groove has an inclined cross-sectional shape.

[0014] The metal box rounded corner bending forming fixture described above has weight reduction grooves opened in the transverse direction on both sides of the receiving section, and the upper end of the weight reduction groove is provided with a transition slope that connects with the assembly part.

[0015] As described above, the metal box rounded corner bending forming fixture has a mounting groove along the length of the bottom center line of the lower fixture for assembling and positioning with the external structure, and the mounting groove has abutment surfaces on both sides that contact the external structure surface.

[0016] The metal box forming fixture described above with rounded corners has a T-shaped mounting groove.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This utility model adopts an integrated structure with upper and lower fixtures, which can quickly process the right-angled edges of metal sheets into smooth rounded corners in a single stamping stroke, achieving one-time forming. It changes the inefficient mode of traditional processes that require multiple bending to approximate the arc contour, greatly improves production efficiency, and reduces the reliance on complex programming and debugging skills of operators.

[0019] 2. By designing specialized positioning structures on the fixture, such as positioning grooves in the upper fixture and mounting grooves in the lower fixture, rapid, accurate, and stable installation between the fixture and the pressure equipment is ensured. This effectively prevents the fixture from deflecting or shifting under the impact force, ensuring high stability in the processing and thus guaranteeing consistent product quality in mass production.

[0020] 3. This utility model optimizes the contours of the stamping part and the curved groove to match cylindrical and semi-circular surfaces, and sets a reasonable gap range. This ensures that the metal sheet is subjected to uniform stress during the forming process, resulting in a full rounded corner contour and a smooth surface without indentations. Simultaneously, the optimized gap range allows it to adapt to various sheet materials within a certain thickness range, avoiding defects such as material tearing or wrinkling caused by improper gaps, thus exhibiting good process versatility. [Attached Image Description]

[0021] To more clearly illustrate the technical solutions in the embodiments of the utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0022] Figure 1 This is a three-dimensional structural diagram of this embodiment;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the upper fixture in this embodiment. Figure 1 ;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the upper fixture in this embodiment. Figure 2 ;

[0025] Figure 4 This is a side view of the upper fixture in this embodiment;

[0026] Figure 5 This is a schematic diagram of a possible three-dimensional structure of the lower type fixture in this embodiment;

[0027] Figure 6 This is a schematic diagram of another possible three-dimensional structure of the lower type fixture in this embodiment;

[0028] Figure 7 For the corresponding Figure 5 Side view of the lower-middle type fixture;

[0029] Figure 8 For the corresponding Figure 6 Side view of the lower-middle type fixture.

Detailed Implementation Methods

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] Please see the appendix Figures 1 to 8 This embodiment provides a metal box rounded corner bending forming fixture, which is mainly used for rounded corner bending forming of metal sheets, especially box-type parts such as chassis and cabinets. The fixture mainly includes a lower fixture 1 and an upper fixture 2 that cooperate with each other.

[0032] In this embodiment, the lower jig 1 is a robust base with a curved groove 11 along its length on its upper part. The cross-sectional shape of the curved groove 11 is used to shape the final rounded corner contour of the metal sheet. Correspondingly, the bottom of the upper jig 2 has a stamping part 21 that matches the curved groove 11 along its length. During operation, the metal sheet to be processed is placed above the curved groove 11 of the lower jig 1. The upper jig 2 moves downward under the drive of an external pressure device such as a stamping press. The stamping part 21 at its bottom presses the sheet into the curved groove 11, and through plastic deformation, the sheet forms rounded corners that conform to the contour of the curved groove 11. The lower jig 1 and the upper jig 2 are made of high-strength, high-hardness materials, such as Cr12MoV cold work die steel, or 45# steel that has undergone heat treatment such as quenching, to ensure their durability and precision during repeated stamping processes. The preferred material is Cr12MoV cold work die steel, which is a high-carbon, high-chromium ledeburitic steel with excellent hardenability, wear resistance and dimensional stability.

[0033] Furthermore, as a preferred embodiment, the cross-sectional shape of the curved groove 11 is semi-circular. The semi-circular design facilitates the fabrication of standardized rounded corners. Of course, those skilled in the art will understand that, depending on different design requirements, the cross-section of the curved groove 11 can also be designed into other smooth curved shapes, such as parabolic or elliptical arcs, and these variations all fall within the scope of this invention.

[0034] Furthermore, corresponding to the semi-circular curved groove 11, the cross-section of the stamping part 21 is set to be cylindrical to ensure that it can maintain a uniform force with the inner wall of the curved groove 11 during the pressing process, thereby obtaining a rounded corner with a clear outline and a smooth surface.

[0035] Furthermore, to achieve better forming results and considering the inherent thickness of the metal sheet, a reasonable gap is required between the stamping part 21 and the curved groove 11. In this embodiment, the cross-sectional radius of the stamping part 21 is set to R1, and the cross-sectional radius of the curved groove 11 is set to R2, with the following relationship: 1mm ≤ R2 - R1 ≤ 3mm. This gap value is an optimized range derived by comprehensively considering the thickness of common metal box sheet materials, which is typically between 0.8mm and 2.5mm, as well as factors such as material springback and thinning during bending. If the gap is too small, such as R2-R1 < 1mm, the sheet material may be overstretched or even torn; if the gap is too large, such as R2-R1 > 3mm, the formed rounded corner contour may be incomplete and the dimensional accuracy may be poor.

[0036] Furthermore, to facilitate the installation and use of the upper jig 2, its structure can be further optimized. The upper jig 2, from bottom to top, includes a stamping section 21, a receiving section 22 connected to the upper end of the stamping section 21, and an assembly section 23 connected to the upper end of the receiving section 22. The assembly section 23 is used to securely connect the entire upper jig 2 to external pressure equipment such as the slide block of a stamping machine.

[0037] As a specific installation structure, the assembly part 23 includes a clamping part 231 on one of its upper ends. A mounting groove 232 is provided laterally on one side of the clamping part 231. This mounting groove 232 can be used to accommodate fasteners such as pressure plates or T-bolts, thereby fixing the upper fixture 2. Meanwhile, a right-angled notch 233 is provided on the other side of the clamping part 231. This notch facilitates installation operations or can cooperate with other positioning structures.

[0038] To further improve the accuracy and stability of installation and prevent slight deflection of the fixture under stress, this embodiment optimizes the aforementioned right-angle notch 233. Specifically, a positioning groove 234 is formed along the length of the inner corner of the right-angle notch 233, and the cross-sectional shape of the positioning groove 234 is inclined. During installation, a matching positioning block on the stamping machine can be embedded in the positioning groove 234 to achieve high-precision positioning and eliminate assembly gaps, greatly improving the stability of the fixture operation.

[0039] Furthermore, as an optional optimization, to reduce the overall weight of the upper jig 2 without significantly reducing structural stiffness, and to facilitate transportation and installation, weight-reducing grooves 221 are respectively opened in the transverse direction on both sides of the receiving section 22. Moreover, a transition slope 222 is provided at the connection between the upper end of the weight-reducing groove 221 and the assembly part 23. This smooth transition design helps to disperse stress, avoid stress concentration at points of abrupt change in structural cross-section, and improve the fatigue strength of the jig.

[0040] Similarly, the lower jig 1 also needs to be stably mounted on the worktable or press base. For this purpose, a mounting groove 12 for assembly and positioning is provided along the length of the bottom centerline of the lower jig 1. The two sides of the mounting groove 12 are formed as flat abutment surfaces 13, which are used to make large-area surface contact with external structures such as the worktable surface, ensuring stable and secure installation.

[0041] More specifically, such as Figure 5 , Figure 7 As shown, the mounting slot 12 is a T-slot. Using standard T-bolts, the lower fixture 1 can be easily, quickly, and reliably fixed to a worktable that also has a T-slot. Of course, the mounting slot can also be other forms, such as... Figure 6 , Figure 8 The through rectangular groove shown is fixed with a pressure plate, or several threaded holes are directly opened for bolt fixing, etc.

[0042] The working process of this embodiment is summarized as follows: First, the lower fixture 1 is fixed to the worktable of the stamping machine via the T-slot; then, the upper fixture 2 is fixed to the slider of the stamping machine via the assembly part 23, and precisely aligned using the positioning slot 234; next, the metal sheet to be processed is placed above the curved groove 11 of the lower fixture 1; finally, the stamping machine is started, the upper fixture 2 moves downward, and its stamping part 21 presses the sheet into the curved groove 11, completing the rounded corner bending. The entire process is characterized by precise positioning, stable structure, and good forming effect.

[0043] The above are implementation methods provided in conjunction with specific content, and it is not intended that the specific implementation of this application is limited to these descriptions. Any methods or structures that are similar to those of this application, or any technical deductions or substitutions made based on the concept of this application, should be considered within the scope of protection of this application.

Claims

1. A metal box round corner bending forming jig, characterized in that, It includes a lower jig (1) and an upper jig (2). The lower jig (1) is provided with a curved groove (11) along the length of the upper part for forming rounded corners of the box plate. The bottom of the upper jig (2) is provided with a stamping part (21) that matches the curved groove (11) along the length of the upper part.

2. The metal box fillet bending forming jig according to claim 1, wherein, The curved groove (11) is semi-circular.

3. The metal box fillet bending forming jig according to claim 2, characterized in that, The cross-section of the stamping part (21) is cylindrical, corresponding to the shape of the curved groove (11).

4. The metal box fillet bending forming jig according to claim 3, characterized in that, Let the cross-sectional radius of the stamping part (21) be R1 and the cross-sectional radius of the curved groove (11) be R2. R1 and R2 satisfy the relationship: 1mm≤R2-R1≤3mm.

5. The metal box fillet bending forming jig according to claim 1, wherein, The upper jig (2) also includes a receiving section (22) connected to the upper end of the stamping part (21), and the upper end of the receiving section (22) is connected to an assembly part (23) for fixing to the external structure.

6. The metal box fillet bending forming jig according to claim 5, wherein The assembly part (23) includes a clamping part (231) on one side of the upper end. A horizontal mounting groove (232) is provided on one side of the clamping part (231), and a right-angle notch (233) is provided on the other side of the clamping part (231).

7. The metal box fillet bending forming jig according to claim 6, characterized in that, A positioning groove (234) is provided along the length of the inside corner of the right-angle notch (233) to improve assembly accuracy and stability. The positioning groove (234) has an inclined cross-sectional shape.

8. The metal box fillet bending forming jig according to claim 5, characterized in that, Weight reduction grooves (221) are provided on both sides of the receiving section (22) in the transverse direction. The upper end of the weight reduction groove (221) is provided with a transition slope (222) that connects with the assembly part (23).

9. The metal box rounded corner bending forming jig according to claim 1, characterized in that, The lower fixture (1) has a mounting groove (12) along the length of its bottom centerline for assembling and positioning with an external structure, and the mounting groove has a contact surface (13) on both sides that contacts the surface of the external structure.

10. The metal box fillet bending forming jig according to claim 9, wherein, The mounting slot (12) is a T-shaped slot.

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