Negative Poisson's ratio metal honeycomb ultra-thin strip forming platform

Abstract

The utility model provides a negative poisson ratio metal honeycomb ultra-thin strip forming platform. Comprising a positive poisson ratio honeycomb belt, a lower pressing plate, a supporting block, a first fixing block, a limiting block, a first guide column, a left sliding plate, a base, a first limiting plate, a first guide rail, a first sliding groove, a second sliding groove, a baffle, a second guide rail, a straight line handle, a third sliding groove, an upper pressing plate, a second limiting plate, a third guide rail, a fourth sliding groove, a rib plate, a connecting plate, a push plate, a fourth guide rail and a second fixing block. A second guide column, a right sliding plate, a forming sliding block, a bushing, a base plate, a positioning bolt and a trapezoidal block; by applying the technical scheme, the part quality can be improved. And meanwhile, a pressure maintaining system of the forming platform can effectively reduce springback of the part and improve the dimensional precision of the part.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal sheet forming technical field especially a kind of negative poisson's ratio metal honeycomb extremely thin strip forming platform. BACKGROUND

[0002] Negative poisson's ratio material is usually formed by the periodic arrangement of structural units with negative poisson's ratio characteristics. Unlike positive poisson's ratio materials, negative poisson's ratio materials expand laterally when stretched and contract laterally when compressed, so they can disperse stress more evenly when impacted, and have better cushioning and energy absorption capacity than conventional materials. In addition, negative poisson's ratio materials also have significant improvements in shear stiffness, fracture toughness and bending performance. Due to their excellent properties, negative poisson's ratio materials have great application potential in aerospace, protective equipment, medical devices and other fields.

[0003] The inner trapezoidal honeycomb strip is a common structural unit with negative poisson's ratio characteristics, which has a special embedded structure, so it is difficult to be made by existing molds. There are two main methods for preparing inner trapezoidal honeycomb strips: the first method is bending process, including manual bending and mechanical bending. Manual bending has low geometric size precision, poor forming quality, and difficulty in ensuring the consistency of the size and shape of each honeycomb unit. At the same time, the processing efficiency is low, and it is difficult to realize mass production. Mechanical bending has the problem of interference between punch and honeycomb strip.

[0004] The second method is special processing, mainly divided into metal additive manufacturing and laser cutting. Metal additive manufacturing equipment is expensive, and the production cycle is long, especially when manufacturing extreme size and high precision parts. The surface of the printed parts is usually rough, and additional post-processing procedures are needed to improve the surface finish. Moreover, not all materials are suitable for metal additive manufacturing. When using laser cutting technology to process such thin strip parts, the high temperature generated during cutting may cause deformation or performance degradation in the heat-affected zone of the material. When the in-plane width of the negative poisson's ratio honeycomb strip is large, laser cutting is also difficult to process. Therefore, the utility model is dedicated to solving the problems of low forming precision and slow production efficiency of negative poisson's ratio metal honeycomb extremely thin strips (thickness less than or equal to 0.1 mm). SUMMARY

[0005] Therefore, the utility model aims to provide a negative poisson's ratio metal honeycomb extremely thin strip forming platform, which can improve the quality of parts. At the same time, the pressure maintaining system of the forming platform can also effectively reduce the springback of the parts and improve the dimensional accuracy of the parts.

[0006] To achieve the above object, the utility model discloses the following technical scheme: a kind of negative poisson's ratio metal honeycomb extremely thin strip forming platform, including positive poisson's ratio honeycomb strip (1), lower pressing plate (2), support block (3), first fixed block (4), limit block (5), first guide pillar (6), left slide plate (7), base (8), first limit plate (9), first guide rail (10), first sliding slot (11), second sliding slot (12), baffle (13), second guide rail (14), straight line handle (15), third sliding slot (16), upper pressing plate (17), second limit plate (18), third guide rail (19), fourth sliding slot (20) ribbed plate (21), connecting plate (22), push plate (23), fourth guide rail (24), second fixed block (25), second guide pillar (26), right slide plate (27), forming slider (28), bushing (29), backing plate (30), positioning bolt (31) and trapezoidal block (32);

[0007] Two groups of support block (3) are fixed at the front and rear ends of lower pressing plate (2), and upper pressing plate (17) is fixed on support block (3) by bolts, and the distance between upper pressing plate (17) and lower pressing plate (2) is the height of the formed part, which is controlled by support block (2), so the size of support block (2) is determined by the parameters of the required negative poisson's ratio honeycomb strip, and the scales on the two sides of upper pressing plate (17) are used to determine the forming range of the part, and the width of the forming area of upper pressing plate (17) and lower pressing plate (2) is wider than the in-plane width of the positive poisson's ratio honeycomb strip.

[0008] In a preferred embodiment, two first fixed blocks (4) are located at the front end of left slide plate (7), limit block (5) and second fixed block (25) are fixed on left slide plate (7), first guide pillar (6) is fixed at the two ends of limit block (5) and second fixed block (25) respectively, and limit block (5) also plays a role in limiting the maximum displacement of the right end of forming slider (28); the two ends of second guide pillar (26) are located at first fixed block (4) and push plate (23), and one side of first fixed block (4) is fixed by bolts, and the other side is not fixed, so as to assist the movement of push plate (23).

[0009] In a preferred embodiment, forming slider (28) freely slides on first guide pillar (6) and second guide pillar (26), is used for exerting forming pressure on the positive poisson's ratio honeycomb strip, the surface thereof is mirror-finished to ensure high-quality forming effect, backing plate (30) prevents forming slider (28) from sinking due to the longer front end, and ensures the smooth movement of the slider, and bushing (29) is installed between forming slider (28) and first guide pillar (6) to reduce the wear between forming slider (28) and first guide pillar (6).

[0010] In a preferred embodiment, the height of the forming slider (28) is higher than the prefabricated positive Poisson's ratio honeycomb strip, and the front end of the forming slider (28) is provided with a rounded corner, so that the height of the end surface isosceles trapezoidal is lower than the positive Poisson's ratio honeycomb strip.

[0011] In a preferred embodiment, the left slide plate (7) is connected with the base (8) through the first guide rail (10) and the first sliding groove (11), the first limiting plate (9) and the second limiting plate (18) are fixed on the base through bolts, and the movement of the left slide plate (7) is limited.

[0012] In a preferred embodiment, the second sliding groove (12) and the third sliding groove (16) are connected through the rib plate (21) and the connecting plate (22), the straight handle (15) is installed on the rib plate (21) to facilitate control of the movement of the whole, the front end of the left slide plate (7) is also provided with a baffle (13) to limit the movement of the second sliding groove (12), the third guide rail (19) and the fourth guide rail (24) are fixed through bolts, the push plate (23) is connected with the fourth sliding groove (20), so that the push plate (23) moves together with the left slide plate (7), the straight handle (15) on the push plate (23) is used for controlling the left and right movement of the slide plate, and the trapezoidal block (32) is connected with the upper pressing plate (17) through the positioning bolt (31) and is used for positioning and fixing the positive Poisson's ratio honeycomb strip.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model discloses simple structure, low manufacturing cost, convenient and fast to use, and production efficiency is fast, can produce a large amount of negative Poisson's ratio honeycomb strip quickly, has very high application value.

[0015] The utility model discloses can satisfy the preparation of different size negative Poisson's ratio honeycomb strip by changing forming slider and support block, and the surface of forming slider adopts mirror surface processing, can realize higher surface finish, reduced the demand of subsequent surface treatment;

[0016] The utility model discloses forming slider has high machining precision, can ensure that each honeycomb unit size and shape consistency, can be fixed and pressure -maintained through fixed hole on guide rail after forming, reduces the springback of part, and the size precision and shape stability are guaranteed.

[0017] The utility model discloses negative Poisson's ratio honeycomb strip forms, only needs through the slide plate drive forming slider to move to both sides and withdraws, can easily take out finished product, avoided the difficult problem that part and male die cannot be smoothly taken out in stamping forming or bending forming process;

[0018] The distance between the upper pressing plate and the lower pressing plate is the required height of the formed part, which can well ensure the flatness of the upper and lower surfaces of the negative Poisson's ratio honeycomb strip after forming, so that subsequent connection processing can be better performed. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the overall three-dimensional view of the negative Poisson's ratio metal honeycomb extremely thin strip forming platform of the preferred embodiment of the utility model;

[0020] Figure 2 It is the partial view after the forming platform of the preferred embodiment of the utility model forms;

[0021] Figure 3 It is the schematic view of the negative Poisson's ratio honeycomb strip of the preferred embodiment of the utility model. Specific implementation

[0022] The utility model will be further described below in combination with the drawings and embodiments.

[0023] It should be pointed out that the following detailed description is all exemplary, and aims at providing further description to the present application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as that generally understood by the ordinary skilled in the art to which the present application belongs.

[0024] It should be noted that the terms used herein are only for describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the present specification, they indicate the presence of a feature, step, operation, device, component and / or their combination.

[0025] The utility model first places the positive Poisson's ratio honeycomb strip in the forming area, applies uniform pressure to it by using multiple trapezoidal sliding blocks, forms an embedded trapezoidal structure in the process of plastic deformation, carries out pressure maintaining treatment through the fixed sliding groove after the forming is completed, reduces the material springback, and finally obtains the high-precision negative Poisson's ratio honeycomb strip. Figure 1 It is the overall three-dimensional view of the negative Poisson's ratio metal honeycomb extremely thin strip forming platform, and Figure 2 It is the schematic view of the partial area after the forming is completed, and Figure 3 It is the negative Poisson's ratio honeycomb strip obtained after the forming. The overall structure of the negative Poisson's ratio metal honeycomb extremely thin strip forming platform comprises: a positive Poisson's ratio honeycomb strip 1, a lower pressing plate 2, a support block 3, a first fixing block 4, a limiting block 5, a first guide column 6, a left sliding plate 7, a base 8, a first limiting plate 9, a first guide rail (10), a first sliding groove 11, a second sliding groove 12, a baffle 13, a second guide rail 14, a straight-grain handle 15, a third sliding groove 16, an upper pressing plate 17, a second limiting plate 18, a third guide rail 19, a fourth sliding groove 20, a rib plate 21, a connecting plate 22, a push plate 23, a fourth guide rail 24, a second fixing block 25, a second guide column 26, a right sliding plate 27, a forming sliding block 28, a bushing 29, a pad plate 30, a positioning bolt 31, and a trapezoidal block 32.

[0026] The connection relationship and function between the parts are as follows:

[0027] The forming platform is symmetrically distributed except the forming slider 28 on both sides. The two groups of supporting blocks 3 are fixed on the front and rear ends of the lower pressing plate 2 through bolts, and the upper pressing plate 17 is fixed on the supporting blocks 3 through bolts. The distance between the upper pressing plate 17 and the lower pressing plate 2 is the height after the part is formed. The interval is controlled by the supporting block 2, so the size of the supporting block 2 is determined by the parameters of the required negative Poisson's ratio honeycomb belt. The scales on both sides of the upper pressing plate 17 are used to determine the forming range of the part. The width of the forming area of the upper and lower pressing plates is slightly wider than the in-plane width of the positive Poisson's ratio honeycomb belt. The two first fixing blocks 4 are located at the front end of the left slide plate 7, and the limiting block 5 and the second fixing block 25 are fixed on the left slide plate 7. The first guide column 6 is fixed on the limiting block 5 and the second fixing block 25 through bolts at both ends, and the limiting block 5 also plays a role in limiting the maximum displacement of the right end of the forming slider 28. The two ends of the second guide column 26 are located at the first fixing block 4 and the push plate 23, and the first fixing block 4 is fixed through a bolt on one side and is not fixed on the other side, so as to assist the movement of the push plate 23.

[0028] The forming slider 28 can freely slide on the first guide column 6 and the second guide column 26, and is used for applying forming pressure to the positive Poisson's ratio honeycomb belt. The surface is mirror treated to ensure high-quality forming effect. The backing plate 30 is used to prevent the forming slider 28 from sinking due to the long front end, and to ensure the smooth movement of the slider. The bushing 29 is installed between the forming slider 28 and the first guide column 6 to reduce the wear between the forming slider 28 and the first guide column 6. Since the height of the forming slider 28 is slightly higher than the prefabricated positive Poisson's ratio honeycomb belt, the front end of the forming slider 28 is provided with a round corner, so that the height of the end surface is lower than the positive Poisson's ratio honeycomb belt, so as to solve the interference caused by the inconsistent height of the two.

[0029] The left slide plate 7 is connected with the base 8 through the first guide rail 10 and the first sliding groove 11, and the first limiting plate 9 and the second limiting plate 18 are fixed on the base through bolts to limit the movement of the left slide plate 7. The second sliding groove 12 and the third sliding groove 16 are connected through the rib plate 21 and the connecting plate 22, and the straight handle 15 is installed on the rib plate 21 to facilitate the control of the movement of the whole. The front end of the left slide plate 7 is also provided with a baffle 13 to limit the movement of the second sliding groove 12. The third guide rail 19 and the fourth guide rail 24 are fixed through bolts, and the push plate 23 is connected with the fourth sliding groove 20, so that the push plate 23 can move together with the left slide plate 7. The straight handle 15 on the push plate 23 is used to control the left and right movement of the slide plate. The trapezoidal block 32 is connected with the upper pressing plate 17 through the positioning bolt 31, and is used for positioning and fixing the positive Poisson's ratio honeycomb belt.

[0030] The negative Poisson's ratio honeycomb belt with a thickness of 0.1mm is taken as an example to further illustrate the utility model, and the specific steps are as follows:

[0031] Step 1: First, apply lubricating oil to the contact surfaces of bushing 29, first guide post 6, second guide post 26, upper pressure plate 17, lower pressure plate 2, and Poisson's ratio honeycomb strip 1 to reduce frictional resistance. Place the Poisson's ratio honeycomb strip to be processed into the upper pressure plate 17 and lower pressure plate 2 from the left side. Determine the forming length according to the scale on one side of the upper pressure plate 17 to ensure that the processing range meets the requirements. Use trapezoidal blocks 32 and positioning bolts 31 to fix the Poisson's ratio honeycomb strip to prevent it from moving during the pressing of the forming sliders (28) on both sides.

[0032] Step 2: Adjust the positions of the forming sliders 28 on both sides according to the scale on the left and right sliding plates (27). First, move the left sliding plate 7 to the second limiting plate 18 using the straight handle 15, and then move the right sliding plate 27. During the movement of the right sliding plate 27, the rounded corner of the front end of the forming slider 28 first contacts the positive Poisson's ratio honeycomb belt and gradually squeezes it. As the forming slider 28 continues to move forward, the height of the positive Poisson's ratio honeycomb belt is stretched to be consistent with the height of the trapezoidal part of the forming slider 28. At this time, the height of the trapezoid inside the positive Poisson's ratio honeycomb belt is the height required for the negative Poisson's ratio honeycomb belt after forming. Therefore, there is no need to adjust the distance between the upper and lower pressure plates during the forming process. When the trapezoidal part of the forming slider 28 is in the trapezoidal groove of the positive Poisson's ratio honeycomb belt, fix the first groove 11, the third groove 16, and the fourth groove 20.

[0033] Step 3: Move the push plate 23 along the direction of the second guide rail 14 through the straight handle 15, so that it pushes the forming slider forward and applies pressure to the positive Poisson's ratio honeycomb belt to cause the positive Poisson's ratio honeycomb belt to bend and deform.

[0034] Step 4: Observe the scale on the left slide plate 7. Once the stroke is reached, the forming is complete. Fix the second slide groove 12 to maintain pressure.

[0035] Step 5: Loosen all the slides and remove the positioning bolts 31. Move the slide plate to both sides until it contacts the first limiting plate 9. Move the push plate 23 to the specified scale position on the left slide plate 7. After taking out the negative Poisson's ratio honeycomb belt, remove the trapezoidal block 32. Clean the oil stains on the forming platform and the surface of the negative Poisson's ratio honeycomb belt. At this point, the negative Poisson's ratio honeycomb preparation process is complete.

Claims

1. A negative Poisson's ratio metal honeycomb ultrathin strip forming platform, characterized in that, Includes a Poisson's ratio honeycomb strip (1), a lower pressure plate (2), a support block (3), a first fixing block (4), a limiting block (5), a first guide post (6), a left sliding plate (7), a base (8), a first limiting plate (9), a first guide rail (10), a first slide groove (11), a second slide groove (12), a baffle (13), a second guide rail (14), a straight-lined handle (15), a third slide groove (16), an upper pressure plate (17), a second limiting plate (18), a third guide rail (19), a fourth slide groove (20), a rib plate (21), a connecting plate (22), a push plate (23), a fourth guide rail (24), a second fixing block (25), a second guide post (26), a right sliding plate (27), a forming slider (28), a bushing (29), a pad plate (30), a positioning bolt (31), and a trapezoidal block (32); Two sets of support blocks (3) are fixed on the front and rear sides of the lower pressure plate (2). The upper pressure plate (17) is fixed on the support block (3) by bolts. The distance between the upper pressure plate (17) and the lower pressure plate (2) is the height of the part after forming. This distance is controlled by the support block (3). Therefore, the size of the support block (3) is determined by the parameters of the required negative Poisson's ratio honeycomb strip. The scale on both sides of the upper pressure plate (17) is used to determine the forming range of the part. The width of the forming area of ​​the upper pressure plate (17) and the lower pressure plate (2) is wider than the in-plane width of the positive Poisson's ratio honeycomb strip.

2. The negative Poisson's ratio metal honeycomb ultrathin strip forming platform according to claim 1, characterized in that, Two first fixing blocks (4) are located at the front end of the left slide plate (7), and the limiting block (5) and the second fixing block (25) are fixed on the left slide plate (7); the two ends of the first guide post (6) are fixed on the limiting block (5) and the second fixing block (25) respectively. At the same time, the limiting block (5) also plays the role of limiting the maximum displacement of the right end of the forming slider (28); the two ends of the second guide post (26) are located on the first fixing block (4) and the push plate (23). It is fixed on one side of the first fixing block (4) by bolts and not fixed on the other side, so as to assist the movement of the push plate (23).

3. The negative Poisson's ratio metal honeycomb ultrathin strip forming platform according to claim 1, characterized in that, The forming slider (28) slides freely on the first guide post (6) and the second guide post (26) to apply forming pressure to the positive Poisson ratio honeycomb tape. Its surface is mirror-finished to ensure high-quality forming effect. The pad (30) prevents the forming slider (28) from sinking due to its long front end and ensures smooth movement of the slider. A bushing (29) is installed between the forming slider (28) and the first guide post (6) to reduce wear between the forming slider (28) and the first guide post (6).

4. The negative Poisson's ratio metal honeycomb ultrathin strip forming platform according to claim 3, characterized in that, The height of the forming slider (28) is higher than that of the prefabricated positive Poisson's ratio honeycomb strip. The front end of the forming slider (28) is provided with rounded corners so that the height of the isosceles trapezoidal end face is lower than that of the positive Poisson's ratio honeycomb strip.

5. The negative Poisson's ratio metal honeycomb ultrathin strip forming platform according to claim 1, characterized in that, The left slide (7) is connected to the base (8) via the first guide rail (10) and the first slide groove (11). The first limiting plate (9) and the second limiting plate (18) are fixed to the base by bolts to limit the movement of the left slide (7).

6. The negative Poisson's ratio metal honeycomb ultrathin strip forming platform according to claim 5, characterized in that, The second slide (12) and the third slide (16) are connected by the rib plate (21) and the connecting plate (22). At the same time, the straight-line handle (15) is installed on the rib plate (21) to facilitate the control of the overall movement. The front end of the left slide plate (7) is also provided with a baffle (13) to restrict the movement of the second slide (12). The third guide rail (19) and the fourth guide rail (24) are fixed by bolts. The push plate (23) is connected to the fourth slide (20) so that the push plate (23) moves together with the left slide plate (7). The straight-line handle (15) on the push plate (23) is used to control the left and right movement of the slide plate. The trapezoidal block (32) is connected to the upper pressure plate (17) by the positioning bolt (31) for positioning and fixing the positive Poisson's ratio honeycomb belt.

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