Multi-point forming die unit body arrangement structure

Abstract

The invention discloses a multi-point forming die unit body arrangement structure which comprises a base, a surrounding plate and a plurality of hexagonal unit bodies, the surrounding plate of a closed structure is fixedly connected to the outer edge of the periphery of the base, the hexagonal unit bodies are arrayed at the upper end of the base, a plurality of holes are formed in the center of the base, and the number of the holes is the same as that of the hexagonal unit bodies. Each hexagonal unit body comprises a unit body head, a sleeve and a lead screw, the motor is fixedly connected in a cavity of the base, a rotating shaft of the motor is fixedly connected with the lead screw through a bolt, the outer wall of the lead screw is in threaded connection with the sleeve, the top end of the sleeve is fixedly connected with the unit body head, the outer edge structure of the sleeve is in a regular hexagon shape, and every two adjacent sleeves are attached to each other; the sleeve on the outermost side is completely matched with the outline of the inner side of the surrounding plate, the adjacent hexagonal unit bodies form a distributed stress transmission path through common-edge contact due to the arrangement of the honeycomb-shaped structure, load distribution in the stamping process is optimized, and surface defects are effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet metal forming, and in particular to a multi-point forming die unit arrangement structure. The die is designed with digital control and a honeycomb arrangement structure to achieve uniform load dispersion, reduced local stress, and improved overall rigidity during high-pressure forming, thereby improving forming accuracy and sheet metal surface quality. Background Art

[0002] In modern industrial production, metal sheets and profiles have been widely used in many fields such as aviation, automobiles, construction, and transportation. With the continuous advancement of science and technology, their application in the manufacture of vehicles is increasing. From aerospace to urban rail systems, the structures of aircraft, high-speed trains, and automobiles are mostly composed of profiles of different materials and cross-sectional shapes. Usually, the original profiles are transformed into various forms that meet the product design requirements after mechanical processing. However, traditional forming molds mostly adopt an integral design, which has the disadvantages of long manufacturing cycle and high cost. In addition, during long-term use, due to uneven local force, deformation and reduced precision are prone to occur.

[0003] In recent years, multi-point forming dies have gradually become a trend. This die discretizes the entire die into multiple independent shaping units, achieving precise shaping control of plates with different curvatures. However, the multi-point dies in the prior art often face the following problems during the shaping process: The unit body’s shaping accuracy is insufficient, resulting in local stress concentration, which in turn causes problems such as indentation, uneven springback, or surface defects; The lack of effective mechanical coupling between discrete punches makes it difficult for the overall rigidity of the die to meet the requirements of high-strength material forming, especially under high loads, local deformation is prone to occur; The mold design failed to fully consider the force distribution and force transmission path of the unit body, and could not effectively disperse the press load, thus reducing the forming effect.

[0004] Therefore, there is an urgent need for a new type of mold whose structural design can not only realize the independent shape adjustment of each unit body, but also provide excellent high rigidity and uniform stress distribution through honeycomb arrangement and closed support frame, thereby meeting the needs of high-precision and high-efficiency forming of various metal sheets. Summary of the invention

[0005] In order to solve the problems of low shaping efficiency, uneven local force of mold units and insufficient forming accuracy in the traditional sheet forming process, the present invention proposes a multi-point forming mold unit arrangement structure. The mold system consists of a solid base, a precisely designed enclosure, and multiple hexagonal units. Each hexagonal unit is closely arranged in a regular hexagonal honeycomb to form a continuous and synergistic working area. Each hexagonal unit has an independent drive motor built in, and receives and executes the control instructions of the curvature of the target sheet in real time through a computer control system, accurately adjusts the speed of the motor, and thus achieves fine adjustment of the height of the hexagonal unit.

[0006] A multi-point forming die unit arrangement structure comprises a base, a panel and a plurality of hexagonal units, the outer edges of the base are fixedly connected with the panel in a closed structure, the upper end of the base is arrayed with a plurality of hexagonal units, and a plurality of holes are provided in the center of the base, the number of the holes being the same as the number of the hexagonal units; The hexagonal unit body includes a unit body head, a sleeve and a screw. The motor is fixedly connected in the hollow of the base. The rotating shaft of the motor is fixedly connected to the screw by bolts. The outer wall of the screw is threaded with a sleeve. The top of the sleeve is fixedly connected to the unit body head. The outer edge structure of the sleeve is a regular hexagon. The two adjacent sleeves fit together, and the outermost sleeve is completely consistent with the inner contour of the enclosure. The regular hexagonal close-packed structure enables adjacent hexagonal units to form a distributed force transfer path through common edge contact, which not only optimizes the distribution of loads during the stamping process and ensures uniform thickness of the sheet, but also effectively reduces the occurrence of surface defects.

[0007] Preferably, an elastic pad is provided on the upper end of the unit head, and the unit head is in contact with the plate through the elastic pad.

[0008] Preferably, the enclosure includes two long enclosures and two short enclosures.

[0009] Preferably, the bottom of the base is fixedly connected to the mold bottom plate through a support plate.

[0010] Beneficial effects of the present invention: The mold system of the present invention is suitable for the forming process of various metal sheets such as aluminum alloy, titanium alloy, high-strength steel, etc. It can efficiently complete the forming task under various process conditions such as stamping forming, and has excellent adaptability. By adopting a shaping device driven by an independent motor, each unit head can move accurately at the same time under the drive of the motor, which not only significantly improves the accuracy and consistency of sheet metal forming, but also greatly reduces the time and energy consumption in the shaping process, and improves the overall production efficiency and economy. The different strokes of each unit body are accurately adjusted by the computer control system. The implementation of this digital shaping scheme can accurately control each unit body in the mold, thereby enhancing the continuity and coordination of discrete molds. This design enables the mold to distribute the load more evenly during the forming process, reduce local stress concentration, and further optimize the forming accuracy and consistency of the sheet metal.

[0011] In summary, the present invention successfully achieves multi-point simultaneous shaping, distributed stress transfer and overall rigidity improvement by adopting independent digital shaping scheme and honeycomb structure design, which significantly optimizes the shaping efficiency and working stability of the mold. Each unit body is driven by an independent motor and can be precisely adjusted, ensuring wide adaptability to different metal materials, not only improving the accuracy and consistency of sheet forming, but also effectively improving the surface quality of the sheet, and significantly reducing defects in the forming process, such as indentations, wrinkles, etc. The design of the honeycomb structure further ensures the uniform distribution of the load, avoids local stress concentration, and thus enhances the durability and deformation resistance of the mold. Through the fine adjustment of the computer control system, the present invention can adapt to the forming requirements of various metal materials such as aluminum alloy, titanium alloy, high-strength steel, and provide efficient and accurate forming solutions under different process conditions. The innovation and flexibility of this technology not only meets the current manufacturing industry's demand for high-precision and high-quality sheets, but also has broad industrial application prospects, especially in the fields of aerospace, automobile manufacturing and high-end equipment manufacturing, and has important application potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The following is a further detailed description of a multi-point forming mold unit arrangement method of the present invention in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 The front view and left view of the hexagonal unit head of the present invention; Figure 3 It is a cross-sectional view of the hexagonal unit body of the present invention in the AA direction; Figure 4 It is a structural schematic diagram of the enclosure of the present invention; Figure 5 is a top view of the base of the present invention; DETAILED DESCRIPTION

[0014] refer to Figure 1 to Figure 5 This embodiment is a multi-point forming mold unit body arrangement structure, including a base 4, a panel and a plurality of hexagonal unit bodies 3, the outer edges of the base 4 are fixedly connected with the panel in a closed structure, the upper end of the base 4 is arrayed with a plurality of hexagonal unit bodies 3, the base 4 is fixed and has a thickness of 40 mm, and a plurality of holes are provided in the center of the base 4, and the number of the holes is the same as the number of the hexagonal unit bodies 3; The hexagonal unit body 3 includes a unit body head 301, a sleeve 302 and a screw 303. The motor 7 is fixedly connected to the hole of the base 4. The rotating shaft of the motor 7 is fixedly connected to the screw 303 by bolts. The outer wall of the screw 303 is threadedly connected with the sleeve 302. The top of the sleeve 302 is fixedly connected with the unit body head 301. The outer edge structure of the sleeve 302 is a regular hexagon. Two adjacent sleeves 302 fit together. The outermost sleeve 302 is completely consistent with the inner contour of the enclosure. This design can effectively disperse the external pressure under high pressure load and reduce the risk of local stress concentration. The overall rigidity and deformation resistance of the mold are greatly improved. The regular hexagonal close-packed structure allows adjacent hexagonal units 3 to form a distributed force transfer path through common edge contact, which not only optimizes the distribution of loads during stamping and ensures uniform thickness of the sheet, but also effectively reduces the generation of surface defects. The outer sleeve 302 of the hexagonal unit body adopts a regular hexagonal close-packed structure, which allows adjacent hexagonal units 3 to form a distributed stress transfer path through common edge contact. When subjected to force, this structure can evenly disperse the load, reduce local stress concentration, and optimize the overall load distribution. In this way, the thickness of the sheet is more uniform during the forming process, and the probability of surface defects such as pits and indentations is significantly reduced, effectively improving the overall fatigue life and stability of the mold.

[0015] Furthermore, an elastic pad is provided at the upper end of the unit head 301, which contacts the plate through the elastic pad, thereby effectively avoiding defects such as wrinkling and indentation of the plate during the forming process.

[0016] Furthermore, the enclosure includes two long enclosures 1 and two short enclosures 2.

[0017] Furthermore, the bottom of the base 4 is fixedly connected to the mold bottom plate 6 through the support plate 5 .

[0018] Furthermore, when forming a high-strength sheet, the adjacent hexagonal unit bodies 3 will be subjected to a large forming pressure, which may cause uneven force on the discrete die, thereby causing defects such as creases or wrinkles on the sheet. In order to solve this problem, the hexagonal sleeve 302 of the hexagonal unit body 3 is optimized to further enhance the distributed force path through common edge contact. This improvement not only optimizes the load distribution during the stamping process, but also makes the thickness of the formed sheet more uniform, while reducing the occurrence of sheet surface defects.

[0019] In order to further improve the forming quality and ensure the wide applicability of the mold, the present invention specially designs a detachable unit head 301. The outer surface of each unit head 301 adopts a spherical structure, and the curvature radius can be adjusted in the range of 50 to 200 mm. This modular design enables the unit head 301 to be quickly replaced and personalized according to the shape and forming requirements of different plates, ensuring that high-precision local shape adjustment can be achieved during the forming process. This design effectively prevents defects such as wrinkling and indentation on the edge of the profile during the forming process, and significantly improves the surface forming quality of the plate. Through this innovation, the mold can more flexibly adapt to a variety of process requirements, while improving production efficiency and finished product quality.

[0020] The inner contour of the enclosure is precisely matched with the outer edge shape of the hexagonal unit 3 at the boundary, and the gap value is controlled at ≤0.1mm, thus ensuring the overall accuracy and stability of the mold. In addition, the thickness of the enclosure is 1.2-1.5 times the thickness of the adjacent unit wall. This design further enhances the mold's ability to resist deformation under high loads, effectively reduces the impact of vibration on mold performance, reduces the risk of local stress fluctuations, and ensures the mold's long-term stability and reliability under long-term high-intensity operation.

[0021] Hexagons have obvious advantages over other polygons in terms of tiling and structural stability. From a geometric point of view, hexagons are one of the few shapes that can seamlessly tile a plane, while other polygons often leave gaps that require additional filling, which not only increases the complexity of the design, but also affects the uniformity of force.

[0022] From the perspective of material utilization and stress characteristics, hexagons require the shortest perimeter for the same area, which can minimize material consumption and improve structural strength. However, other polygons have irregular shapes, and even if they can be spliced, they will lead to complex boundaries and uneven stress, which increases the difficulty of manufacturing and assembly.

[0023] In terms of mechanical stability, the 120° internal angle design of the hexagon can naturally disperse external forces, making the overall structure evenly stressed and maintaining high rigidity and stability. In contrast, other polygons are prone to forming stress concentration points due to unreasonable number of sides or angle distribution, resulting in uneven local stress or insufficient overall rigidity, thus affecting structural stability and load-bearing capacity.

[0024] In general, hexagons can not only achieve efficient paving and optimize space utilization, but also improve structural stability, evenly distribute external forces, and reduce material costs. Therefore, they are widely used in engineering fields, such as honeycomb structures, crystal arrangements, and multi-point flexible forming molds.

[0025] In addition, the honeycomb arrangement has significant advantages in force distribution compared to the traditional regular arrangement (such as square array) and staggered arrangement (such as staggered matrix). Regularly arranged units are prone to form local stress concentration areas when subjected to force, affecting the stability of the overall structure. Although the staggered arrangement improves the force uniformity to a certain extent, the large gaps between the units still lead to insufficient overall rigidity and poor structural stability.

[0026] The honeycomb arrangement optimizes the geometric layout to make the force more uniform and avoid local stress concentration problems, while maximizing space utilization, reducing material waste, and improving structural strength. Under the action of external forces, the structure can effectively disperse the load, improve the ability to resist deformation, and make the overall structure more stable and reliable. Therefore, in the design of multi-point flexible forming molds, the use of hexagonal units can not only optimize the force distribution and improve the forming quality, but also reduce manufacturing costs and improve the durability and processing efficiency of the mold.

[0027] In summary, the die adopts independent motor drive, hexagonal close-packed unit structure and distributed force transmission design, which not only significantly improves the sheet forming accuracy and reduces surface defects, but also optimizes the load distribution and effectively improves the stability and fatigue life of the die. Its innovative design enables it to have superior performance under high-strength and high-precision forming requirements, and has significant industrial application value and broad promotion prospects.

Claims

1. A multi-point forming die unit arrangement structure, characterized in that: The base (4) comprises a base (4), a panel and a plurality of hexagonal unit bodies (3), wherein the base (4) is fixedly connected to the panel at the outer edges thereof to form a closed structure, the upper end of the base (4) is provided with a plurality of hexagonal unit bodies (3) in an array, and the center of the base (4) is provided with a plurality of holes, the number of the holes being the same as the number of the hexagonal unit bodies (3), and being arranged in a honeycomb shape; The hexagonal unit body (3) comprises a unit body head (301), a sleeve (302) and a lead screw (303); the motor (7) is fixedly connected in a hole of the base (4); the rotating shaft of the motor (7) is fixedly connected to the lead screw (303) by means of bolts; the sleeve (302) is threadedly connected to the outer wall of the lead screw (303); the top of the sleeve (302) is fixedly connected to the unit body head (301); the outer edge structure of the sleeve (302) is a regular hexagon; two adjacent sleeves (302) fit together; the outermost sleeve (302) completely fits the inner contour of the enclosure plate; the arrangement of the honeycomb structure enables adjacent hexagonal unit bodies (3) to form a distributed force transmission path through common edge contact, which not only optimizes the distribution of loads during the stamping process and ensures uniform thickness of the plate, but also effectively reduces the generation of surface defects.

2. The multi-point forming mold unit arrangement structure according to claim 1, characterized in that: An elastic pad is provided at the upper end of the unit head (301), and contacts the plate through the elastic pad.

3. The multi-point forming mold unit arrangement structure according to claim 1, characterized in that: The enclosure comprises two long enclosures (1) and two short enclosures (2).

4. The multi-point forming mold unit arrangement structure according to claim 1, characterized in that: The bottom of the base (4) is fixedly connected to the mold bottom plate (6) via a support plate (5).

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