Forming die and forming method of novel double-body folding core

Abstract

The invention discloses a novel forming die for double folding cores, which comprises a fixed frame, a hydraulic jack is arranged at the top in the fixed frame, a multi-stage forming assembly for a part plate is arranged between the hydraulic jack and the bottom in the fixed frame, and each stage of forming assembly comprises a male die and a female die, the male die is connected with an output shaft of the hydraulic jack, the female die is movably installed at the bottom in the fixing frame, the male die and the female die which are fixed in the fixing frame form a multi-stage forming assembly, the hydraulic jack is used for applying load to complete compression of a part plate, compression of a folding plate in a folding core is achieved, and the compression efficiency is improved. The folding plate in the folding core is effectively prevented from wrinkling in the machining process, the process is simple, cost is low, and batch production is easy.

Description

Technical Field

[0001] This invention relates to the field of origami structure forming technology, specifically to a forming mold for a type of twin folding core and its forming method. Background Technology

[0002] Origami structures have extremely wide applications in energy absorption devices in aerospace, automotive, and civil engineering fields. Origami structures are formed by folding specific materials along the creases of a specific origami pattern. Among these, the Miura origami pattern is one of the most widely used origami patterns in engineering. Traditional Miura folding cores possess better energy absorption, excellent air permeability, and good sound and heat insulation capabilities. However, after the deformation mode changes, excessively large side lengths can lead to a decrease in structural load-bearing capacity, thereby reducing energy absorption efficiency.

[0003] The existing patent publication number CN202310100871.X, entitled "A Miura Configuration Unit Cell and Folding Core of an Origami Structure," discloses a twin Miura folding core structure, which includes multiple unit structures. Each unit structure is achieved by introducing a pair of geometrically symmetrical and equal-sized twin folds into the core of the Miura origami structure, which is a traditional Miura folding core structure. When a load is applied, the impact force is transmitted along the axial direction of the folding core, initially affecting the top region of the origami unit. Due to the presence of sub-folds, the sub-fold area becomes a low-stiffness weak point, and the impact force causes stress concentration in the sub-folds, resulting in preferential buckling of the sub-fold portion. Subsequently, it enters the plastic yielding stage, generating plastic hinge lines. When a further load is applied, unlike the traditional structure, the plastic hinge lines move downward along the direction of the sub-folds, forming moving plastic hinge lines. Due to the formation and propagation of the moving plastic hinge lines, the impact force is effectively absorbed over a larger range, thereby significantly improving the energy absorption efficiency.

[0004] Current research on the fabrication of novel twin folded cores mainly focuses on technologies such as 3D printing, "synchronous methods," and "pre-aggregation." Many engineers employ advanced manufacturing methods like 3D printing to prepare metal origami structures. However, compared to traditional forged metal, the resulting structures inevitably suffer from process defects such as discontinuous cross-sections. Furthermore, the high manufacturing cost limits the production size and scale of origami structures. The "synchronous method" involves folding all fold lines simultaneously, approximating the theoretical rigid folding process. However, this method has limitations, only capable of processing traditional V-shaped and M-shaped Miura folded cores, making processing relatively restrictive. "Pre-aggregation" uses cold air pressure folding technology to achieve the folding of the Miura folded core. This method requires very few tools, facilitating rapid design and fabrication. However, due to the limitations imposed by etching sheets, the core size is restricted, limiting its application to prototypes and hindering large-scale deployment. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a forming mold and forming method for a twin folded core, which solves the problem of high manufacturing cost of existing folded cores.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: On the one hand, a novel forming mold for a twin folded core is provided, which includes a fixed frame, a hydraulic jack is provided at the top of the fixed frame, and a multi-stage forming assembly for the part plate is provided between the hydraulic jack and the bottom of the fixed frame. Each forming assembly includes a male mold and a female mold. The male mold is connected to the output shaft of the hydraulic jack, and the female mold is movably installed on the bottom of the fixed frame.

[0007] This solution forms a multi-stage forming assembly by fixing male and female molds within a fixed frame. The part plate is compressed by applying load through hydraulic jacks, thereby compressing the folded plate in the folded core. This effectively prevents wrinkles from forming in the folded plate during processing. The process is simple, low-cost, and easy to mass-produce.

[0008] Furthermore, the male mold includes a first connecting plate and a first pressing plate disposed on the lower surface of the first connecting plate; The female mold includes a second connecting plate and a second pressing plate disposed on the upper surface of the second connecting plate; the first pressing plate and the second pressing plate are provided with matching pressing angles.

[0009] Furthermore, the pressing angle on the next-level female mold or male mold is smaller than the pressing angle on the previous-level female mold or male mold.

[0010] Furthermore, the upper surface of the first connecting plate is connected to the output shaft of the hydraulic jack via a flange.

[0011] Furthermore, countersunk through holes are provided at the four corners of the second connecting plate, and threaded holes that match the countersunk through holes are provided on the fixing frame. The female mold is fixed by inserting bolts through the countersunk through holes into the threaded holes.

[0012] Furthermore, both the male and female molds are made of resin.

[0013] On the other hand, a molding method based on a novel twin-folded core molding die includes the following steps: Step S1, Hydraulic jack assembly: Fix the hydraulic jack to the top of the fixed frame; Step S2, Male mold assembly: Fix the male mold in the forming assembly onto the hydraulic jack; Step S3, Female mold assembly: Fix the female mold in the forming assembly to the bottom of the fixed frame; Step S4, stamping: Place the part plate on the surface of the female mold, start the hydraulic jack, and apply load hydraulically to compress the part plate to obtain a folded plate; Step S5, Demolding: After the folded plate is compressed, remove the folded plate and use metal glue to stick the folded plate to the upper plate and the lower plate respectively to obtain the folded core.

[0014] Furthermore, the stamping method in step S4 includes the following steps: Step S41: Using the first-stage female mold and male mold, the load is applied by hydraulic jack to compress the part plate to obtain the first-stage folded plate; Step S42: Replace the first-level female mold and male mold with the second-level female mold and male mold, continue to apply load to complete the compression of the part plate, and obtain the second-level folded plate; Step S43: Replace the second-level female mold and male mold with the third-level female mold and male mold, continue to apply load to complete the compression of the part plate, and obtain the third-level folded plate.

[0015] This invention discloses a novel forming mold and forming method for a twin folded core, the beneficial effects of which are: This solution forms a multi-stage forming assembly by fixing male and female molds within a fixed frame. The part plate is compressed by applying load through hydraulic jacks, thereby compressing the folded plate in the folded core. This effectively prevents wrinkles from forming in the folded plate during processing. The process is simple, low-cost, and easy to mass-produce. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the forming mold for a novel twin folded core according to the present invention.

[0017] Among them, 1. fixed frame; 2. hydraulic jack; 3. male mold; 31. first connecting plate; 32. first pressing plate; 4. female mold; 41. second connecting plate; 42. second pressing plate; 43. countersunk through hole. Detailed Implementation The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0018] Example 1 refer to Figure 1 This embodiment provides a novel forming mold for a twin folded core, the purpose of which is to solve the problem of high manufacturing cost of existing folded cores. The specific structure of this embodiment will be described in detail below.

[0019] A novel forming mold for a twin folding core, comprising a fixing frame 1; Specifically, a hydraulic jack 2 is provided at the top of the fixed frame 1; a multi-stage forming assembly for the part plate is provided between the hydraulic jack 1 and the bottom of the fixed frame 2; each forming assembly includes a male mold 3 and a female mold 4; the male mold 3 is connected to the output shaft of the hydraulic jack 2, and the female mold 4 is movably installed on the bottom of the fixed frame 1.

[0020] In this embodiment, the hydraulic jack 2 is positioned at the top of the fixed frame 1, while the male mold 3 is fixed to the output shaft of the hydraulic jack 2, and the female mold 4 is movably mounted on the bottom of the fixed frame 1. The positions of the female mold 4 and the male mold 3 are relatively aligned. Then, by applying a load through hydraulic jack 2, the male mold 3 is moved closer to the female mold 4 to complete the compression of the part plate, thereby compressing the folded plate in the folded core. This effectively prevents wrinkles from forming in the folded plate during processing. The process is simple, low-cost, and easy to mass-produce.

[0021] Optionally, the material of the component plate can be 6061-T6 type aluminum plate.

[0022] Specifically, the male mold 3 includes a first connecting plate 31 and a first pressing plate 32 disposed on the lower surface of the first connecting plate 31; the female mold 4 includes a second connecting plate 41 and a second pressing plate 42 disposed on the upper surface of the second connecting plate 41; the first pressing plate 32 and the second pressing plate 42 are provided with matching pressing angles.

[0023] Specifically, the pressing angle on the next level female mold 4 or male mold 3 is smaller than the pressing angle on the previous level female mold 4 or male mold 3.

[0024] In this embodiment, each forming component includes a male mold 3 and a female mold 4, thereby forming a multi-stage forming component. The pressing angle on the next-stage female mold 4 or male mold 3 is smaller than the pressing angle on the previous-stage female mold 4 or male mold 3, which can effectively prevent wrinkles from forming in the folded plate of the folded core during processing. The pressing angle matches the shape of the folded plate in the folded core.

[0025] Specifically, the upper surface of the first connecting plate 31 is connected to the output shaft of the hydraulic jack 2 via a flange.

[0026] In this embodiment, a flange is provided in the middle of the upper surface of the first connecting plate 31, and another flange is provided at the end of the output shaft of the hydraulic jack 2. The two flanges are connected by bolts to facilitate the connection between the first connecting plate 31 and the hydraulic jack 2.

[0027] Specifically, countersunk through holes 43 are provided at the four corners of the second connecting plate 41, and threaded holes that fit into the countersunk through holes 43 are provided on the fixing frame 1. The female mold 4 is fixed by inserting bolts through the countersunk through holes 43 into the threaded holes.

[0028] In this embodiment, bolts are inserted through countersunk holes 43 into threaded holes on the fixing frame 1, which facilitates replacement while achieving positioning and fixation, and can prevent the mold from shifting during the pressing process.

[0029] Specifically, the male mold 3 and the female mold 4 are made of resin.

[0030] In this embodiment, the male mold 3 and female mold 4 are made of resin material and can be manufactured by 3D printing. The pressed shape and size of the male mold 3 and female mold 4 can be determined by the shape and size of the folding plate in the folding core.

[0031] Example 2 refer to Figure 1 This embodiment provides a molding method for a novel twin folded core forming mold, which aims to address the high cost of existing folded core manufacturing processes. The specific structure of this embodiment will be described in detail below.

[0032] A molding method for a novel twin-folded core molding die includes the following steps: Step S1: Assemble the hydraulic jack 2: Fix the hydraulic jack 2 to the top of the fixed frame 1; Step S2, Assembly of male mold 3: Fix the male mold 3 in the forming assembly onto the hydraulic jack 2; Step S3, female mold 4 assembly: Fix the female mold 4 in the forming assembly to the bottom of the fixed frame 1; Step S4, stamping: Place the part plate on the surface of the female mold 4, start the hydraulic jack 2, and apply load hydraulically to complete the compression of the part plate to obtain a folded plate; The stamping method in step S4 includes the following steps: Step S41: Using the first-stage female mold 4 and male mold 3, the hydraulic jack 1 is used to apply load to compress the part plate, thus obtaining the first-stage folded plate; Step S42: Replace the first-level female mold 4 and male mold 3 with the second-level female mold 4 and male mold 3, and continue to apply load to complete the compression of the part plate to obtain the second-level folded plate; Step S43: Replace the second-level female mold 4 and male mold 3 with the third-level female mold 4 and male mold 3, and continue to apply load to complete the compression of the part plate to obtain the third-level folded plate.

[0033] Step S5, Demolding: After the folded plate is compressed, remove the folded plate and use metal glue to stick the folded plate to the upper plate and the lower plate respectively to obtain the folded core.

[0034] Both the upper and lower plates selected are made of Q235 steel with a thickness of 1mm.

[0035] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A novel forming mold for a twin folded core, characterized in that: Including the fixed frame (1); A hydraulic jack (2) is provided at the top inside the fixed frame (1); a multi-stage forming assembly for the part plate is provided between the hydraulic jack (1) and the bottom inside the fixed frame (2); each stage of the forming assembly includes a male mold (3) and a female mold (4); the male mold (3) is connected to the output shaft of the hydraulic jack (2), and the female mold (4) is movably installed on the bottom inside the fixed frame (1).

2. The forming mold for the novel twin folded core according to claim 1, characterized in that: The male mold (3) includes a first connecting plate (31) and a first pressing plate (32) disposed on the lower surface of the first connecting plate (31); The female mold (4) includes a second connecting plate (41) and a second pressing plate (42) disposed on the upper surface of the second connecting plate (41); the first pressing plate (32) and the second pressing plate (42) are provided with matching pressing angles.

3. The forming mold for the novel twin folded core according to claim 2, characterized in that: The pressing angle on the next-level female mold (4) or male mold (3) is smaller than the pressing angle on the previous-level female mold (4) or male mold (3).

4. The forming mold for the novel twin folded core according to claim 2, characterized in that: The upper surface of the first connecting plate (31) is connected to the output shaft of the hydraulic jack (2) via a flange.

5. The forming mold for the novel twin folded core according to claim 2, characterized in that: The second connecting plate (41) has countersunk through holes (43) at its four corners. The fixing frame (1) has threaded holes that fit the countersunk through holes (43). The female mold (4) is fixed by inserting a bolt through the countersunk through holes (43) into the threaded holes.

6. The forming mold for the novel twin folded core according to claim 1, characterized in that: The positive mold (3) and the negative mold (4) are made of resin.

7. A molding method for a molding die based on the novel twin-folded core as described in any one of claims 1-6, characterized in that, Includes the following steps: Step S1, Hydraulic jack (2) assembly: Fix the hydraulic jack (2) to the top of the fixed frame (1); Step S2, male mold (3) assembly: fix the male mold (3) in the forming assembly onto the hydraulic jack (2); Step S3, female mold (4) assembly: fix the female mold (4) in the forming assembly to the bottom of the fixed frame (1); Step S4, stamping: Place the part plate on the surface of the female mold (4), start the hydraulic jack (2), and apply the load hydraulically to complete the compression of the part plate to obtain the folded plate; Step S5, Demolding: After the folded plate is compressed, remove the folded plate and use metal glue to stick the folded plate to the upper plate and the lower plate respectively to obtain the folded core.

8. The molding method of the forming mold for the novel twin folded core according to claim 7, characterized in that, The stamping method in step S4 includes the following steps: Step S41: Using the first-stage female mold (4) and male mold (3), the load is applied by the hydraulic jack (1) to compress the part plate and obtain the first-stage folded plate; Step S42: Replace the first-level female mold (4) and male mold (3) with the second-level female mold (4) and male mold (3), and continue to apply load to complete the compression of the part plate to obtain the second-level folded plate; Step S43: Replace the second-level female mold (4) and male mold (3) with the third-level female mold (4) and male mold (3), and continue to apply load to complete the compression of the part plate to obtain the third-level folded plate.

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