A mold turning and bending structure

Abstract

This utility model discloses a mold turning and bending structure, including an upper mold assembly and a lower mold assembly. The upper mold assembly includes an upper mold base, a punch fixing base, and a bending punch. The punch fixing base is fixedly disposed with the upper mold base, and the bending punch is rotatably disposed at the lower part of the punch fixing base. An elastic reset member is provided on the punch fixing base, abutting against the bending punch to provide an elastic force for the bending punch to reset after rotation. The bending punch has an inner bending portion. The lower mold assembly includes a lower mold base and a forming block. The forming block is fixedly disposed relative to the lower mold base and has an outer bending portion adapted to the inner bending portion. This utility model, by setting a rotatable bending punch in cooperation with a fixed forming block, achieves adaptive rotation during the bending process, effectively avoiding indentations, deformation, or cracking of the workpiece caused by forced bending. It ensures the consistency of bending angle and shape, thereby solving problems such as indentations, cracking, inconsistent angles, and low production efficiency during the workpiece bending process.

Description

Technical Field

[0001] This utility model relates to the field of mold manufacturing technology, specifically to a mold turning and bending structure. Background Technology

[0002] In the sheet metal processing industry, bending is a common and important forming process, widely used in the manufacture of various metal structural parts. Traditional bending dies typically use a fixed punch and lower die for bending, which has significant limitations when handling certain special structures (such as workpieces requiring rounded corners). Because the punch stroke is fixed and the angle is not adjustable, uneven stress on the workpiece during bending can easily occur, causing quality problems such as surface indentations, micro-cracks, or even breakage. Furthermore, after bending, traditional structures often require external mechanisms or manual intervention to reset the punch, which not only reduces production efficiency but also makes it difficult to guarantee consistent reset accuracy, hindering the continuous operation of automated production lines.

[0003] Therefore, it is necessary to provide a high-precision bending die structure that can adaptively adjust the bending angle, avoid workpiece damage, and automatically reset. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a mold turning and bending structure. By combining a rotatable bending punch with an elastic reset mechanism, adaptive rotation and automatic precise reset can be achieved during the bending process, thereby solving problems such as indentation, cracking, inconsistent angles and low production efficiency during the workpiece bending process.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A mold bending structure includes an upper mold assembly and a lower mold assembly that cooperate with each other. The upper mold assembly includes an upper mold base, a punch fixing base, and a bending punch. The punch fixing base is fixedly disposed with the upper mold base, and the bending punch is rotatably disposed at the lower part of the punch fixing base. The punch fixing base is provided with an elastic reset member, which abuts against the bending punch and is used to provide an elastic force to reset the bending punch after it rotates. The bending punch is provided with an inwardly recessed inner bending portion. The lower mold assembly includes a lower mold base and a forming block. The forming block is fixedly disposed relative to the lower mold base, and the forming block is provided with an outer bending portion that matches the inner bending portion.

[0006] Furthermore, the lower part of the punch holder is provided with an arc-shaped mounting groove, and the bending punch is rotatably accommodated in the arc-shaped mounting groove.

[0007] Furthermore, one end of the elastic reset member abuts against the inside of the punch fixing seat, and the other end abuts against the bending punch.

[0008] Furthermore, the elastic reset element is a spring.

[0009] Furthermore, the lower module also includes a molding block fixing seat, which is fixedly disposed with the lower mold base, and the molding block is fixedly disposed on the upper part of the molding block fixing seat.

[0010] Furthermore, the bending punch is a cylindrical body with an inner bending portion and a reset groove opposite to the inner bending portion on its circumferential surface, and the end of the elastic reset member abuts against the reset groove; the cross-section of the reset groove has a V-shaped structure.

[0011] Furthermore, the side of the punch holder is provided with a fixing pad for stopping the side of the bending punch, and the fixing pad is fixedly connected to the punch holder by a connecting pin.

[0012] Furthermore, the upper mold base is provided with guide pillars, and the lower mold base is provided with guide sleeves that cooperate with the guide pillars.

[0013] Furthermore, the upper module includes two sets of symmetrically arranged punch holders and bending punches.

[0014] Compared with existing technologies, the technical solution of this patent has the following advantages: 1. By setting a rotatable bending punch that cooperates with a fixed forming block, adaptive rotation during the bending process is achieved, effectively avoiding indentations, deformation, or cracking of the workpiece caused by forced bending. This ensures the consistency of bending angle and shape.

[0015] 2. The bending punch can rotate adaptively within the arc-shaped mounting groove, conforming to the shape of the forming block to complete complex bending actions, making it more adaptable to workpieces.

[0016] 3. The built-in elastic reset component can automatically, quickly and accurately reset the bending punch to the initial position during the return stroke of the upper die, preparing it for the next stamping, without the need for manual intervention, which greatly improves production efficiency.

[0017] 4. Through a series of structural designs, such as limiting the motion trajectory with arc-shaped mounting grooves, fixing shims to prevent axial movement, and guide pillars and guide sleeves to ensure mold closing accuracy, the stability, repeatability, and service life of the mold under high-speed stamping are ensured.

[0018] 5. A symmetrical dual-station design can be adopted to complete the bending of both sides of the workpiece simultaneously, thus doubling production efficiency. Attached Figure Description

[0019] Figure 1 The figure shown is a side view of the structure of this utility model in the mold-open state; Figure 2 The figure shown is a cross-sectional view of the present invention in the mold-open state; Figure 3 The figure shown is a cross-sectional view of the present invention in the mold-closed state; Figure 4 The figure shown is a three-dimensional structural schematic diagram of this utility model; Figure 5 The diagram shown is a three-dimensional structural schematic of the upper module; Figure 6 The diagram shown is a three-dimensional structural schematic of the lower module. Figure 7 The diagram shows a three-dimensional structure of a bending punch.

[0020] In the diagram: 1. Upper module; 11. Upper die base; 12. Punch holder; 121. Arc-shaped mounting groove; 13. Bending punch; 131. Inner bending section; 132. Reset groove; 14. Elastic reset component; 15. Fixing washer; 16. Connecting pin; 17. Guide post; 2. Lower module; 21. Lower die base; 22. Forming block holder; 23. Forming block; 231. Outer bending section; 24. Guide sleeve; 3. Workpiece. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] See Figure 1-7 As shown, this embodiment provides a mold bending structure, including an upper mold assembly 1 and a lower mold assembly 2 that cooperate with each other. The upper mold assembly 1 includes an upper mold base 11, a punch fixing base 12, and a bending punch 13. The punch fixing base 12 is fixedly disposed with the upper mold base 11, and the bending punch 13 is rotatably disposed at the lower part of the punch fixing base 12. The punch fixing base 12 is provided with an elastic reset member 14, which abuts against the bending punch 13 and is used to adjust the bending punch 13. The rotation provides an elastic force to reset it; the bending punch 13 is provided with an inwardly recessed inner bending portion 131; the lower die 2 includes a lower die base 21 and a forming block 23, the forming block 23 is fixedly disposed relative to the lower die base 21, the forming block 23 is provided with an outer bending portion 231 adapted to the inner bending portion 131, the concave curved surface of the inner bending portion 131 and the convex curved surface of the outer bending portion 231 are adapted to each other, together forming a forming space for rounding and bending the workpiece 3.

[0023] This mold's bending structure incorporates a core bending actuator. Through the coordination of the upper and lower dies, particularly the interaction between the rotatable bending punch and the fixed forming block, the workpiece is bent and formed. The bending punch 13 is rotatably mounted on the punch holder 12, allowing it to adaptively rotate during its descent based on the contact between the workpiece and the forming block 23, thus completing the bending action. The precise fit design between the inner bending part 131 and the outer bending part 231 ensures the accuracy and consistency of the bending angle and shape, effectively avoiding defects such as deformation, indentation, or cracking caused by uneven force on the workpiece. The design of the elastic reset element 14 allows the bending punch 13 to automatically return to its initial position after bending, preparing for the next bending operation, greatly improving production efficiency and automation.

[0024] The lower part of the punch holder 12 is provided with an arc-shaped mounting groove 121, within which the bending punch 13 is rotatably accommodated. The arc-shaped mounting groove 121 precisely defines the rotation axis and movement trajectory of the bending punch, ensuring the stability of its movement process and preventing deflection or jamming, thereby ensuring the repeatability accuracy of the bending action. It should be noted that the opening end of the arc-shaped mounting groove 121 has a constricted structure, which constrains and prevents the bending punch 13 from falling off. In addition, two side stop connecting blocks can be further provided on the upper module, with a rotating shaft connecting the two side stop connecting blocks. The rotating shaft is connected in series with the center of the bending punch 13, allowing the axis of rotation of the bending punch 13 to rotate. Furthermore, in order to enable the bending punch 13 to rotate smoothly within the arc-shaped mounting groove 121, the inner wall of the arc-shaped mounting groove 121 and the bending punch 13 can be polished with a high-gloss process to form a high-gloss surface.

[0025] One end of the elastic reset member 14 abuts against the inside of the punch fixing seat 12, and the other end abuts against the bending punch 13. The elastic reset member 14 is a spring. The installation method of having one end abut against the inside of the punch fixing seat 12 and the other end abut against the bending punch 13 allows the spring force to act on the bending punch most directly and effectively, with little force loss and a rapid and powerful reset response.

[0026] The lower die assembly 2 also includes a forming block fixing seat 22, which is fixedly disposed with the lower die base 21. The forming block 23 is fixedly disposed on the upper part of the forming block fixing seat 22. By adding a transition structure to fix the forming block 23, and fixing the forming block 23 to the lower die base 21 through the forming block fixing seat 22, the overall rigidity and impact resistance of the entire lower die assembly are enhanced, preventing displacement or vibration during the stamping process and ensuring bending accuracy.

[0027] The bending punch 13 is a cylindrical body with an inner bending portion 131 and a reset groove 132 opposite to the inner bending portion 131 on its circumferential surface. The inner bending portion 131 creates two outwardly protruding protrusions 133 in the bending punch 13. The end of the elastic reset member 14 abuts against the reset groove 132; the reset groove 132 has a V-shaped cross-section. The structure of the bending punch is optimized, integrating functional surfaces and ensuring effective application of the reset force. The specially designed reset groove 132 provides an abutment structure for the end of the spring, ensuring that the reset force always acts at the optimal position, making the reset action smoother and more reliable, and avoiding reset problems caused by force point deviation.

[0028] The side of the punch holder 12 is provided with a fixing shim 15 for stopping the side of the bending punch 13. The fixing shim 15 is fixedly connected to the punch holder 12 by a connecting pin 16. The fixing shim 15 and the connecting pin 16 constrain the bending punch 13 from the side, completely preventing it from moving axially during operation, and retaining only the rotational freedom required by its design, which greatly improves the reliability of operation.

[0029] The upper die holder is equipped with guide pillars 17, and the lower die holder 21 is equipped with guide sleeves 24 that cooperate with the guide pillars 17. This provides precise guidance for the upper and lower dies, ensuring that the upper and lower dies can be accurately aligned in each stamping, avoiding die damage and product scrap rate caused by misalignment, and improving the reliability and safety of the operation.

[0030] In this embodiment, the upper module 1 includes two symmetrically arranged punch holders 12 and bending punches 13. It can simultaneously perform bending processing on both sides of the workpiece 3, doubling the production efficiency compared to single-sided sequential bending.

[0031] The working process of this mold is as follows: The upper mold base 11 moves downward under the drive of the press, driving the entire upper mold assembly to move downward. The guide post 17 is first inserted into the guide sleeve 24 to ensure mold closing guidance. Subsequently, a protrusion 133 at the lower end of the bending punch 13 first contacts the workpiece 3 placed on the forming block 23. As the upper mold continues to move downward, the bending punch 13 is resisted by the workpiece 3 and the forming block 23, overcoming the spring force, and rotates (counterclockwise) within the arc-shaped mounting groove 121 of the punch fixing seat 12. During this process, the inner bending part 131 of the bending punch 13 gradually fits into the outer bending part 231 of the forming block 23, pressing the workpiece 3 into the cavity formed between them, thereby completing precise bending and rounding corner forming.

[0032] After bending is completed, the press drives the upper die to return upward. As the upper die moves upward, the pressure of the bending punch 13 on the workpiece 3 disappears. At this time, the elastic reset member 14, which has been compressed, releases its elastic force and pushes the reset groove 132 on the bending punch 13 to rotate in the opposite direction (clockwise) and return to the initial position, preparing for the next work cycle.

Claims

1. A mold turning and bending structure, comprising an upper mold assembly (1) and a lower mold assembly (2); characterized in that, The upper module (1) includes an upper die base (11), a punch fixing base (12), and a bending punch (13). The punch fixing base (12) is fixedly disposed with the upper die base (11), and the bending punch (13) is rotatably disposed at the lower part of the punch fixing base (12). The punch fixing base (12) is provided with an elastic reset member (14), which abuts against the bending punch (13) and is used to provide an elastic force to reset the bending punch (13) after it rotates. The bending punch (13) is provided with an inwardly recessed inner bending portion (131). The lower module (2) includes a lower die base (21) and a forming block (23). The forming block (23) is fixedly disposed relative to the lower die base (21), and the forming block (23) is provided with an outer bending portion (231) that is adapted to the inner bending portion (131).

2. The mold turning and bending structure according to claim 1, characterized in that, The lower part of the punch holder (12) is provided with an arc-shaped mounting groove (121), and the bending punch (13) is rotatably accommodated in the arc-shaped mounting groove (121).

3. The mold turning and bending structure according to claim 1 or 2, characterized in that, One end of the elastic reset member (14) abuts against the inside of the punch fixing seat (12), and the other end abuts against the bending punch (13).

4. The mold turning and bending structure according to claim 3, characterized in that, The elastic reset element (14) is a spring.

5. The mold turning and bending structure according to claim 1, characterized in that, The lower module (2) also includes a molding block fixing seat (22), which is fixedly disposed with the lower mold base (21), and the molding block (23) is fixedly disposed on the upper part of the molding block fixing seat (22).

6. The mold turning and bending structure according to claim 1, characterized in that, The bending punch (13) is a columnar body with an inner bending part (131) and a reset groove (132) opposite to the inner bending part (131) on its circumference. The end of the elastic reset member (14) abuts against the reset groove (132). The reset groove (132) has a V-shaped cross-section.

7. The mold turning and bending structure according to claim 1, characterized in that, The side of the punch holder (12) is provided with a fixing pad (15) for blocking the side of the bending punch (13). The fixing pad (15) is fixedly connected to the punch holder (12) by a connecting pin (16).

8. The mold turning and bending structure according to claim 1, characterized in that, The upper mold base (11) is provided with a guide post (17), and the lower mold base (21) is provided with a guide sleeve (24) that cooperates with the guide post (17).

9. The mold turning and bending structure according to claim 1, characterized in that, The upper module (1) includes two sets of symmetrically arranged punch holders (12) and bending punches (13).

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