Swing block type negative angle bending die

Abstract

The utility model discloses a swing block type negative angle bending die which comprises an upper die assembly, a lower die assembly and a bending swing block, the lower die assembly is matched with the upper die assembly in a counterpoint mode through a reset spring and a guide structure, the bending swing block is located on the upper die assembly, the lower die assembly is provided with a machining station, an insert is arranged in the machining station, and meanwhile the bending swing block is arranged in the machining station. The upper die assembly is provided with an insertion rod opposite to the bending swing block, and the swing block is provided with a hydraulic buffering structure, so that the influence on the surface of a material plate is reduced.

Description

Technical Field

[0001] The present application relates to the field of stamping dies, and in particular to a swing block type negative angle bending die. Background Art

[0002] In the prior art, swing-block negative-angle bending dies are widely used in sheet metal bending processes. These dies achieve negative-angle bends by swinging the die structure. Traditional swing-block negative-angle bending dies typically consist of a fixed die and a swinging die. The swinging die applies pressure to the sheet metal, creating a negative-angle bend.

[0003] However, existing pendulum-type negative-angle bending dies have some significant shortcomings in practical applications. First, because the rigid structure of the die directly contacts the sheet metal, it is easy to leave marks on the sheet metal during the bending process, resulting in poor surface quality of the finished product. Especially in demanding surface treatment applications, such marks can significantly reduce the product's market value and competitiveness. Furthermore, due to the high impact force during the bending process, the metal sheet may suffer local deformation and damage at the bending point, affecting the dimensional accuracy and structural integrity of the final product.

[0004] In order to solve the above problems, attempts were also made to add an anti-scratch material layer to the pendulum block structure. After the above improvements, although the problems can be significantly improved, new problems have emerged. The buffering effect of relying solely on the anti-scratch material layer is limited, and due to the large daily processing volume of the stamping die, the anti-scratch material layer will wear out and fail after a period of time, which cannot meet the needs of long-term, large-scale production. In the pendulum block technology currently being tried, the material layer is mostly fixed by bonding and vulcanization process, and the pendulum block can only be replaced as a whole, affecting production efficiency. Utility Model Content

[0005] The purpose of the present application is to overcome at least one of the shortcomings of the prior art and to provide a swing block type negative angle bending die, which has a hydraulic buffer structure to reduce the impact on the surface of the material sheet.

[0006] To achieve the above-mentioned purpose, the present application discloses a pendulum-type negative-angle bending mold, which includes an upper mold assembly, a lower mold assembly aligned with the upper mold assembly through a reset spring and a guide structure, and a bending pendulum block located in the upper mold assembly, wherein the lower mold assembly is provided with a processing position, and an insert is provided in the processing position. At the same time, the upper mold assembly is provided with an insertion rod opposite to the bending pendulum block, and the bending pendulum block used for bending processing is installed on the upper mold assembly through a hydraulic buffer and aligned with the processing position and the insert; the hydraulic buffer has a fixed block, a movable block installed on the fixed block through a guide column, and a hydraulic spring installed between the movable block and the fixed block, the hydraulic spring drives the movable block to reset after being compressed relative to the fixed block, and the bending pendulum block is hinged on the movable block; the bending pendulum block is hinged on the hydraulic buffer, the bending pendulum block is curved in shape, and the movable end is provided with a mounting groove for mounting a polymer arc block, the polymer arc block is arc-shaped, and partially extends out of the mounting groove, so that the polymer arc block can be detachably mounted on the movable end of the bending pendulum block.

[0007] In some embodiments, the hydraulic spring is arranged vertically.

[0008] In some embodiments, a working portion opposite to the bending pendulum block is installed at the bottom of the insertion rod through a hydraulic spring, and the hydraulic spring is used to provide the insertion rod with a buffer stroke.

[0009] Compared with the prior art, this application has at least one of the following beneficial effects:

[0010] 1. Reduce scratches on the surface of the plate: The hydraulic buffer structure realizes the pre-load control during the bending process, avoiding the scratches on the metal plate caused by excessive pressure in the initial stage, thereby significantly improving the surface quality of the finished product. It is especially suitable for metal plates with high surface requirements.

[0011] 2. Improved production efficiency and mold life: By using hydraulic buffers and polymer arc blocks instead of traditional anti-scratch material layers, the risk of anti-scratch material wear due to long-term use is reduced. The hydraulic system has a longer service life, reducing mold maintenance frequency and replacement cycles, thereby improving production efficiency.

[0012] 3. Improve deformation control during the bending process: The hydraulic buffer structure effectively disperses the impact force during the bending process, avoiding local deformation or damage of the metal sheet at the bending point, thereby ensuring the dimensional accuracy and structural integrity of the final product.

[0013] 4. Flexible and detachable polymer arc block design: The detachable polymer arc block is convenient for quick replacement and maintenance, which improves the adaptability and flexibility of the mold and ensures that the mold can operate stably and efficiently in long-term production.

[0014] The above-listed beneficial effects are not exhaustive and other potential beneficial effects and detailed technical implementations will be further disclosed in the examples or other description sections of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] After reading the following detailed description in conjunction with the accompanying drawings, you will better understand the various aspects of the present disclosure. The positions, sizes, and ranges of various structures shown in the drawings and the like sometimes do not represent the actual positions, sizes, and ranges. In the drawings:

[0016] Figure 1 It is a structural explosion diagram of an embodiment disclosed in this application.

[0017] Figure 2 This is a schematic structural diagram of a hydraulic buffer and a bending pendulum block in an embodiment disclosed in the present application. DETAILED DESCRIPTION

[0018] The present disclosure will be described below with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the present disclosure more complete and fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide many additional embodiments.

[0019] It should be understood that like reference numerals refer to like elements throughout the drawings. In the drawings, the dimensions of some features may be distorted for clarity.

[0020] It should be understood that the terms used in the specification are only used to describe specific embodiments and are not intended to limit the present disclosure. All terms (including technical and scientific terms) used in the specification have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of brevity and / or clarity, the techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered part of the authorization specification.

[0021] As used in this specification, the singular forms "a," "an," "said," and "the" include the plural forms unless otherwise expressly stated. The terms "include," "comprise," and "contain" as used in this specification indicate the presence of the claimed features, but do not exclude the presence of one or more additional features. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items. Example

[0022] Refer to the attached Figure 1 and 2In this embodiment, a pendulum-type negative-angle bending die is described. Its structure consists of multiple precisely designed components, including an upper die assembly 1, a lower die assembly 2, a bending pendulum block 3, an insert rod 4, a hydraulic buffer 5, and a polymer arc block 6. The coordination between these components and their operating principles will be described in detail to clearly demonstrate the implementation and advantages of this invention.

[0023] First, the upper die assembly 1 and lower die assembly 2 of the mold are aligned and matched using a return spring and guide structure. The return spring's primary function is to return the mold to its initial position through elastic rebound after the mold completes the bending operation. The return spring's stiffness and preload must be precisely set according to the specific working conditions to ensure accurate mold resetting and avoid mold position shifts that affect machining accuracy during repeated use. The guide structure, consisting of guide pins and guide sleeves, guides the relative motion between the upper die assembly 1 and lower die assembly 2, ensuring a stable and stable trajectory, thereby reducing precision loss due to errors or mechanical friction.

[0024] The lower die assembly 2 features a machining station, which supports the workpiece and provides a position for bending. Inside this station, an insert enhances the wear resistance and strength of the contact area between the die and the workpiece during machining, preventing wear and surface damage over time. The material selection for the insert typically prioritizes wear resistance, corrosion resistance, and high strength to extend the die's lifespan and maintain precision.

[0025] The upper mold assembly 1 is provided with an insert rod 4 opposite to the bending pendulum block 3. The insert rod 4 is used to cooperate with the bending pendulum block 3 during the operation of the mold, transmit the externally applied force and ensure that the bending pendulum block 3 can accurately complete the bending action. The bottom of the insert rod 4 is connected to the working part 7 of the bending pendulum block 3 via a hydraulic spring. The role of the hydraulic spring here is to provide a buffer stroke so that the bending pendulum block 3 can move smoothly under the action of external force, avoiding damage to the mold and workpiece due to excessive impact force. The hydraulic spring is compressed when subjected to force due to its elastic characteristics, and automatically resets after the external force is released, thereby achieving buffering and slowing down the suddenness of the reaction force to avoid damage to the mold.

[0026] The bending pendulum block 3 is connected to the hydraulic buffer 5, which is mainly composed of a fixed block, a movable block and a hydraulic spring. The fixed block is fixed to the upper mold assembly 1, and the movable block is connected to the fixed block through a guide column and can slide axially on the guide column. The hydraulic spring is installed between the fixed block and the movable block to provide a buffering force. The design of the hydraulic buffer 5 can adjust the buffering effect according to the size of the external force during the bending process. When the bending pendulum block 3 contacts the workpiece and applies a bending force, the hydraulic spring begins to compress, and the flow of the liquid medium alleviates the impact of the external force, ensuring that the movement of the bending pendulum block 3 is smoother and reducing the impact of the impact force on the mold.

[0027] The movable end of the bending pendulum block 3 is provided with a mounting slot for mounting a polymer arc block 6. The polymer arc block 6 is an arc-shaped structure, partially extending from the mounting slot and being removable. The main function of the polymer arc block 6 is to reduce the friction between the mold and the workpiece during the bending process through its high elasticity and wear resistance, thereby improving the accuracy of the bending process and protecting the workpiece surface from damage. In addition, the use of polymer materials also greatly improves the durability of the mold and reduces processing errors caused by wear. Due to the detachable nature of the polymer arc block 6, the mold can be replaced according to actual needs after long-term use, further extending the service life of the mold.

[0028] In this embodiment, the bending pendulum block 3 is connected to the upper mold assembly 1 through the insert rod 4, and the relative movement of the insert rod 4 and the bending pendulum block 3 is provided with smooth mechanical support by the hydraulic buffer 5. The hydraulic spring absorbs the impact force during the bending process through its buffer stroke, ensuring that the mold can still maintain stable operation under high load. Specifically, during the bending process, the working end of the insert rod 4 will contact the movable end of the bending pendulum block 3 and apply a bending force. In this process, the hydraulic spring absorbs the impact energy generated by the external force through gradual compression, slowing down the transmission speed of the force. The characteristics of the flow of liquid in the hydraulic system make the release process of the impact force smoother and reduce the damage to the mold and workpiece due to the sudden impact force.

[0029] The hydraulic buffer 5 not only mitigates impact forces but also controls the return speed of the bending pendulum 3. The hydraulic spring's resilience ensures a smooth return to the active block after external forces, ensuring precision and stability throughout the bending process. The hydraulic buffer system is optimized based on the workpiece material, bending angle, and required force, ensuring efficient and stable mold operation under varying loads.

[0030] In summary, the pendulum block type negative angle bending die in this embodiment successfully achieves effective buffering of the impact force during the bending process and smooth resetting of the die through the precise coordination of components such as the upper die assembly 1, the lower die assembly 2, the bending pendulum block 3, the insert rod 4, the hydraulic buffer 5 and the polymer arc block 6. The hydraulic buffer 5 minimizes the damage to the die and the workpiece caused by the impact force through the synergistic effect of its liquid flow and spring compression, thereby improving the processing accuracy and extending the service life of the die. In addition, the design of the polymer arc block 6 enhances the durability of the die, reduces friction, and ensures that the surface of the workpiece is not damaged. The innovative design of the die structure, especially the optimization in terms of buffering, resetting and wear resistance, fully meets the requirements of high efficiency, precision and long-term stable operation.

[0031] Although exemplary embodiments of the present disclosure have been described, it will be understood by those skilled in the art that various changes and modifications may be made to the exemplary embodiments of the present disclosure without departing substantially from the spirit and scope of the present disclosure. Therefore, all such changes and modifications are intended to be within the scope of protection of the present disclosure as defined by the appended claims. The present disclosure is defined by the appended claims, and equivalents of these claims are intended to be included therein.

Claims

1. A pendulum-type negative angle bending die, comprising an upper die assembly, a lower die assembly aligned with the upper die assembly via a return spring and a guide structure, and a bending pendulum block located on the upper die assembly, wherein: The lower mold assembly is provided with a processing position, and an insert is provided in the processing position. At the same time, the upper mold assembly is provided with an insertion rod opposite to the bending pendulum block, which is characterized in that: the bending pendulum block used for bending processing is installed on the upper mold assembly through a hydraulic buffer and is aligned with the processing position and the insert; the hydraulic buffer has a fixed block, a movable block installed on the fixed block through a guide column, and a hydraulic spring installed between the movable block and the fixed block. The hydraulic spring drives the movable block to reset after being compressed relative to the fixed block, and the bending pendulum block is hinged on the movable block; the bending pendulum block is hinged on the hydraulic buffer, the bending pendulum block is curved and the movable end is provided with a mounting groove for installing a polymer arc block, the polymer arc block is arc-shaped, and part of it extends out of the mounting groove, so that the polymer arc block can be detachably mounted on the movable end of the bending pendulum block.

2. A swing block type negative angle bending die as claimed in claim 1, characterized in that: The hydraulic spring is arranged vertically.

3. A swing block type negative angle bending die as described in claim 1, characterized in that: A working portion opposite to the bending pendulum block is installed at the bottom of the insertion rod through a hydraulic spring, and the insertion rod also has a buffer stroke through the hydraulic spring.

Images