A negative poisson's ratio metal honeycomb ultra-thin strip forming platform and a method of using the same

Abstract

The application provides a negative Poisson's ratio metal honeycomb ultra-thin strip forming platform and a use method thereof, which comprises a positive Poisson's ratio honeycomb strip, a lower pressing plate, a supporting block, a first fixing block, a limiting block, a first guide column, a left slide 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, a second fixing block, a second guide column, a right slide plate, a forming slide block, a bushing, a backing plate, a positioning bolt and a trapezoidal block. The technical scheme can improve the quality of parts. Meanwhile, the pressure maintaining system of the forming platform can effectively reduce the springback of the parts and improve the size precision of the parts.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal sheet forming, in particular to a negative Poisson's ratio metal honeycomb ultra-thin strip forming platform and a use method thereof. BACKGROUND

[0002] A negative Poisson's ratio material is usually a metal corrugated plate formed by periodic arrangement of structural units with a negative Poisson's ratio characteristic. Unlike a positive Poisson's ratio material, a negative Poisson's ratio material expands laterally when subjected to tension and shrinks laterally when subjected to pressure, so that the negative Poisson's ratio material can more evenly disperse stress when subjected to impact and has better cushioning and energy absorption capacity than conventional materials. In addition, the negative Poisson's ratio material also has significant improvements in shear stiffness, fracture toughness, bending performance and the like. Due to its excellent characteristics, the negative Poisson's ratio material has great application potential in aerospace, protective equipment, medical devices and the like.

[0003] The inner trapezoidal honeycomb strip is a common structural unit with a negative Poisson's ratio characteristic, which has a special embedded structure feature, so it is difficult to be prepared by existing molds. There are mainly two methods for preparing the inner trapezoidal honeycomb strip at present: the first method is a bending process, including manual bending and mechanical bending. The manual bending has problems such as low geometric size precision, poor forming quality, difficulty in ensuring the consistency of the size and shape of each honeycomb unit, and low processing efficiency, which is difficult to realize batch production. The mechanical bending has the problem of interference between the punch and the honeycomb strip.

[0004] The second method is special processing, mainly including metal additive manufacturing and laser cutting. The 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 part is usually rough, and additional post-processing process is 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 in the cutting process may cause the deformation or performance degradation of 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 present application aims to solve the problems of low forming precision and slow production efficiency of the negative Poisson's ratio metal honeycomb ultra-thin strip (thickness less than or equal to 0.1 mm). SUMMARY

[0005] Therefore, the purpose of the present application is to provide a negative Poisson's ratio metal honeycomb ultra-thin strip forming platform and a use method thereof, which can improve the part quality. At the same time, the pressure maintaining system of the forming platform can also effectively reduce the springback of the part and improve the dimensional accuracy of the part.

[0006] To achieve the above object, the present application adopts the following technical scheme: a negative Poisson's ratio metal honeycomb ultra-thin strip forming platform, comprising 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 slide 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-line 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 slide plate (27), a forming slide block (28), a bushing (29), a backing plate (30), a positioning bolt (31), and a trapezoidal block (32).

[0007] Two groups of support blocks (3) are fixed on the front and rear ends of the lower pressing plate (2), and the upper pressing plate (17) is fixed on the support blocks (3) through bolts. The distance between the upper pressing plate (17) and the lower pressing plate (2) is the height of the formed part, which is controlled by the support blocks (2). Therefore, the size of the support blocks (2) is determined by the parameters of the required negative Poisson's ratio honeycomb strip. 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 pressing plate (17) and the 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 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 at both ends of the limiting block (5) and the second fixing block (25), and the limiting block (5) also serves to limit the maximum displacement of the right end of the forming slide block (28). The second guide column (26) is located at the first fixing block (4) and the push plate (23) at both ends, and is fixed on one side of the first fixing block (4) through a bolt, and is not fixed on the other side, so as to assist the movement of the push plate (23).

[0009] In a preferred embodiment, the forming slide block (28) freely slides on the first guide column (6) and the second guide column (26), and is used to apply forming pressure to the positive Poisson's ratio honeycomb strip. The surface of the forming slide block (28) is mirror finished to ensure high-quality forming effect. The backing plate (30) prevents the forming slide block (28) from sinking due to the longer front end, and ensures the smooth movement of the slide block. The bushing (29) is installed between the forming slide block (28) and the first guide column (6) to reduce the wear between the forming slide block (28) and the first guide column (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 are used for limiting the movement of the left slide plate (7).

[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), 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 the 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] The application also provides a use method of the negative Poisson's ratio metal honeycomb ultra-thin strip forming platform.

[0014] Step one: first, the contact surfaces of the bushing (29), the first guide column (6), the second guide column (26), the upper pressing plate (17), the lower pressing plate (2) and the positive Poisson's ratio honeycomb strip (1) are sprayed with lubricating oil for lubrication, so as to reduce the friction resistance; the positive Poisson's ratio honeycomb strip to be processed is placed from the left into the upper pressing plate (17) and the lower pressing plate (2), the forming length is determined according to the scale on one side of the upper pressing plate (17), and it is ensured that the processing range meets the requirements; the trapezoidal block (32) and the positioning bolt (31) are used for fixing the positive Poisson's ratio honeycomb strip, so as to prevent movement in the forming process.

[0015] Step two: adjust the position of the two side forming sliders (28) according to the scale on the left slide plate (7) and the right slide plate (27), move the left slide plate (7) to the second limiting plate (18) through the straight handle (15) first, then move the right slide plate (27), the rounded portion at the front end of the forming slider (28) is in contact with the positive Poisson's ratio honeycomb strip during the movement of the right slide plate (27), and gradually extrudes, as the forming slider (28) continues to advance, the positive Poisson's ratio honeycomb strip height is stretched to be consistent with the height of the trapezoidal portion of the forming slider (28), at this time the height of the trapezoidal portion in the positive Poisson's ratio honeycomb strip is the required height of the negative Poisson's ratio honeycomb strip after forming, so there is no need to adjust the distance between the upper and lower pressing plates during the forming process; when the trapezoidal portion of the forming slider (28) is in the trapezoidal groove of the positive Poisson's ratio honeycomb strip, fix the first sliding groove (11), the third sliding groove (16) and the fourth sliding groove (20);

[0016] Step three: move the push plate (23) along the direction of the second guide rail (14) through the straight handle (15), so as to push the forming slider to advance and apply pressure to the positive Poisson's ratio honeycomb strip to make the positive Poisson's ratio honeycomb strip bend and deform;

[0017] Step four: observe the scale on the left slide plate (7), and after the stroke is reached, the forming is completed, and the second sliding groove (12) is fixed to maintain pressure;

[0018] Step five: loosen all the sliding grooves, remove the positioning bolts (31), move the slide plates to the two sides to contact the first limiting plate (9), move the push plate (23) to the specified scale of the left slide plate (7), take out the negative Poisson's ratio honeycomb strip, remove the trapezoidal block (32), clean the oil stains on the forming platform and the surface of the negative Poisson's ratio honeycomb strip, and thus the preparation process of the negative Poisson's ratio honeycomb is completed.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The present application has the advantages of simple structure, low manufacturing cost, convenient and fast use, high production efficiency, fast production of a large number of negative Poisson's ratio honeycomb strips, and high application value;

[0021] The present application can meet the preparation of negative Poisson's ratio honeycomb strips of different sizes by replacing the forming slider and the supporting block, and the surface of the forming slider is mirror treated, so that a high surface finish can be realized, and the need for subsequent surface treatment is reduced;

[0022] The forming slider has high machining precision, can ensure the consistency of the size and shape of each honeycomb unit, and can be fixed and pressure-maintained through the fixing holes on the guide rail after forming, so as to reduce the springback of the parts, maintain the dimensional accuracy and shape stability;

[0023] After the negative Poisson's ratio honeycomb strip is formed, only the forming sliding block is driven by the sliding plate to retreat to both sides, so that the finished product can be easily taken out, and the problem that the parts and the convex die cannot be smoothly taken out in the stamping forming or bending forming process is avoided.

[0024] The distance between the upper and lower pressing plates is the required height of the formed part, which can well ensure the flatness of the upper and lower surfaces of the formed negative Poisson's ratio honeycomb strip, so that subsequent connection processing can be better performed. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a negative Poisson's ratio metal honeycomb extremely thin strip forming platform overall three-dimensional view of the preferred embodiment of the application.

[0026] Figure 2 It is a partial view after the forming platform is formed, which is a preferred embodiment of the application.

[0027] Figure 3 It is a negative Poisson's ratio honeycomb strip schematic view of the preferred embodiment of the application. DETAILED DESCRIPTION

[0028] The application will be further described below in combination with the drawings and embodiments.

[0029] It should be noted that the following detailed description is all exemplary and is intended to provide further description of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0030] It should be noted that the terms used herein are only for the purpose of 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 specification, they indicate the presence of a feature, step, operation, device, component and / or combination thereof.

[0031] The present application first places the positive Poisson's ratio honeycomb strip in the forming area, applies uniform pressure to it by using multiple groups of trapezoidal sliding blocks, forms an embedded trapezoidal structure in the process of plastic deformation, performs pressure maintaining treatment through the fixed sliding groove after the forming is completed, reduces material springback, and finally obtains a high-precision negative Poisson's ratio honeycomb strip. Figure 1 It is a negative Poisson's ratio metal honeycomb extremely thin strip forming platform overall three-dimensional view, which is a preferred embodiment of the application. Figure 2 It is a partial view after the forming is completed, which is a preferred embodiment of the application. Figure 3The negative Poisson's ratio honeycomb strip is obtained after forming. The overall structure of the negative Poisson's ratio metal honeycomb ultra-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 slide 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-line 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 slide plate 27, a forming slide block 28, a bushing 29, a gasket 30, a positioning bolt 31, and a trapezoidal block 32.

[0032] The connection relationship and functions between the parts are as follows:

[0033] The forming platform is symmetrically distributed on both sides except the forming slide block 28. Two groups of support 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 support blocks 3 through bolts. The distance between the upper pressing plate 17 and the lower pressing plate 2 is the height of the formed part, which is controlled by the support block 2. Therefore, the size of the support block 2 is determined by the parameters of the required negative Poisson's ratio honeycomb strip. The scales on both sides of the upper pressing plate 17 are used to determine the forming range of the part, and 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 strip. 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 serves to limit the maximum displacement of the right end of the forming slide block 28. The second guide column 26 is located at the first fixing block 4 and the push plate 23 at both ends, and is fixed on the first fixing block 4 side through a bolt, and is not fixed on the other side, so as to assist the movement of the push plate 23.

[0034] The forming slide block 28 can freely slide on the first guide column 6 and the second guide column 26, and is used to apply forming pressure to the positive Poisson's ratio honeycomb strip. The surface of the forming slide block 28 is mirror-finished to ensure high-quality forming effect. The gasket 30 is used to prevent the forming slide block 28 from sinking due to the longer front end, and to ensure smooth movement of the slide block. The bushing 29 is installed between the forming slide block 28 and the first guide column 6 to reduce wear between the forming slide block 28 and the first guide column 6. Since the height of the forming slide block 28 is slightly higher than that of the preformed positive Poisson's ratio honeycomb strip, the front end of the forming slide block 28 is provided with a round corner, so that the height of the end surface of the isosceles trapezoid is lower than that of the positive Poisson's ratio honeycomb strip, so as to solve the interference caused by the inconsistent heights of the two.

[0035] 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 are used for limiting 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, and the front end of the left slide plate 7 is also provided with the 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 can move 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 belt.

[0036] The preparation of the negative Poisson's ratio honeycomb belt with a thickness of 0.1 mm is taken as an example to further illustrate the present application, and the specific steps are as follows:

[0037] Step one: first, the contact surfaces of the bushing 29, the first guide column 6, the second guide column 26, the upper pressing plate 17, the lower pressing plate 2 and the positive Poisson's ratio honeycomb belt 1 are sprayed with lubricating oil for lubrication to reduce the friction resistance. The positive Poisson's ratio honeycomb belt to be processed is placed in the upper pressing plate 17 and the lower pressing plate 2 from the left side, the forming length is determined according to the scale on one side of the upper pressing plate 17, and it is ensured that the processing range meets the requirements. The trapezoidal block 32 and the positioning bolt 31 are used to fix the positive Poisson's ratio honeycomb belt to prevent the positive Poisson's ratio honeycomb belt from moving during the pressing process of the two side forming sliding blocks (28);

[0038] Step two: the positions of the two side forming sliding blocks 28 are adjusted according to the scale on the left slide plate 7, the left slide plate 7 is first moved to the second limiting plate 18 through the straight handle 15, and then the right slide plate 27 is moved, in the moving process of the right slide plate 27, the round corner part at the front end of the forming sliding block 28 first contacts the positive Poisson's ratio honeycomb belt and gradually extrudes, along with the continuous advancement of the forming sliding block 28, 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 sliding block 28, at this time, the height of the trapezoidal part in the positive Poisson's ratio honeycomb belt is the required height of the negative Poisson's ratio honeycomb belt after forming, so it is not necessary to adjust the distance between the upper and lower pressing plates during the forming process. When the trapezoidal part of the forming sliding block 28 is in the trapezoidal groove of the positive Poisson's ratio honeycomb belt, the first sliding groove 11, the third sliding groove 16 and the fourth sliding groove 20 are fixed.

[0039] Step three: the push plate 23 is moved along the direction of the second guide rail 14 through the straight handle 15, so that the push plate 23 pushes the forming sliding block to advance, and the positive Poisson's ratio honeycomb belt is subjected to pressure to be bent and deformed;

[0040] Step four: the scale on the left slide plate 7 is observed, and the forming is completed after the stroke is reached, and the second sliding groove 12 is fixed for pressure maintaining;

[0041] Step five: loosen all the sliding slot, remove the positioning bolt 31, move the slide plate to the side to contact with the first limiting plate 9, push the plate 23 to the left side of the slide plate 7 to the specified scale, take out the negative Poisson's ratio honeycomb belt, remove the trapezoidal block 32, clean the surface of the forming platform and the negative Poisson's ratio honeycomb belt, and thus the negative Poisson's ratio honeycomb preparation process is completed.

Claims

1. A negative Poisson's ratio metallic honeycomb ultra-thin strip forming platform, characterized in that, The device comprises positive Poisson ratio honeycomb belt (1), lower pressing plate (2), support block (3), first fixed block (4), limiting block (5), first guide column (6), left slide plate (7), base (8), first limiting plate (9), first guide rail (10), first sliding groove (11), second sliding groove (12), baffle (13), second guide rail (14), straight handle (15), third sliding groove (16), upper pressing plate (17), second limiting plate (18), third guide rail (19), fourth sliding groove (20), rib plate (21), connecting plate (22), push plate (23), fourth guide rail (24), second fixed block (25), second guide column (26), right slide plate (27), shaped sliding block (28), bushing (29), backing plate (30), positioning bolt (31) and trapezoidal block (32); Two groups of support blocks (3) are fixed on the front and rear ends of the lower pressing plate (2), and the upper pressing plate (17) is fixed on the support blocks (3) through bolts. The distance between the upper pressing plate (17) and the lower pressing plate (2) is the height of the formed part, which is controlled by the support blocks (3). Therefore, the size of the support blocks (3) is determined by the parameters of the required negative Poisson 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 pressing plate (17) and the lower pressing plate (2) is wider than the in-plane width of the positive Poisson ratio honeycomb belt; Two first fixed blocks (4) are located at the front end of the left slide plate (7), and the limiting block (5) and the second fixed block (25) are fixed on the left slide plate (7). The first guide column (6) is fixed at the limiting block (5) and the second fixed block (25) respectively. The limiting block (5) also limits the maximum displacement of the right end of the shaped sliding block (28). The second guide column (26) is located at the first fixed block (4) and the push plate (23) at both ends. It is fixed on one side of the first fixed block (4) through a bolt, and the other side is not fixed, so as to assist the movement of the push plate (23). 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, which are used 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). The straight handle (15) is installed on the rib plate (21) to facilitate the control of the movement of the whole device. 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 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), which is used for positioning and fixing the positive Poisson ratio honeycomb belt.

2. The negative Poisson's ratio metal honeycomb ultra-thin strip forming platform according to claim 1, characterized in that, The forming slider (28) is freely slid on the first guide column (6) and the second guide column (26) for applying forming pressure to the positive Poisson's ratio honeycomb strip, the surface of the forming slider (28) is mirror treated to ensure high quality forming effect; the gasket (30) prevents the forming slider (28) from sinking due to the long front end, and ensures 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).

3. The negative Poisson's ratio metal honeycomb ultra-thin strip forming platform according to claim 2, characterized in that, The height of the forming slider (28) is higher than that of the prefabricated positive Poisson's ratio honeycomb strip, and the front end of the forming slider (28) is provided with a round corner, so that the height of the end surface isosceles trapezoidal is lower than that of the positive Poisson's ratio honeycomb strip.

4. A method of using a negative Poisson's ratio metal honeycomb ultra-thin strip forming platform, characterized in that The forming platform for the negative Poisson's ratio metal honeycomb ultra-thin strip according to any one of the preceding claims comprises the following steps: Step one: first, lubricate the contact surfaces of the bushing (29), the first guide column (6), the second guide column (26), the upper pressing plate (17), the lower pressing plate (2) and the positive Poisson's ratio honeycomb strip (1) with lubricating oil to reduce the friction resistance; the positive Poisson's ratio honeycomb strip to be processed is placed in the upper pressing plate (17) and the lower pressing plate (2) from the left side, the forming length is determined according to the scale on one side of the upper pressing plate (17) to ensure that the processing range meets the requirements; the trapezoidal block (32) and the positioning bolt (31) are used to fix the positive Poisson's ratio honeycomb strip to prevent it from moving during the pressing process of the two side forming sliders (28); Step two: adjust the positions of the two side forming sliders (28) according to the scales on the left side sliding plate (7) and the right side sliding plate (27), move the left side sliding plate (7) to the second limiting plate (18) first, and then move the right side sliding plate (27) through the straight line handle (15), the round corner part of the front end of the forming slider (28) first contacts and gradually extrudes the positive Poisson's ratio honeycomb strip during the movement of the right side sliding plate (27), and as the forming slider (28) continues to advance, the height of the positive Poisson's ratio honeycomb strip is stretched to be consistent with the height of the trapezoidal part of the forming slider (28), at this time the height of the trapezoidal in the positive Poisson's ratio honeycomb strip is the required height of the negative Poisson's ratio honeycomb strip after forming, so there is no need to adjust the distance between the upper and lower pressing 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 strip, the first sliding groove (11), the third sliding groove (16) and the fourth sliding groove (20) are fixed; Step three: move the push plate (23) along the direction of the second guide rail (14) through the straight line handle (15) to make it push the forming slider to advance, and apply pressure to the positive Poisson's ratio honeycomb strip to make it bend and deform; Step four: observe the scale on the left side sliding plate (7), and when the stroke is reached, the forming is completed, and the second sliding groove (12) is fixed for pressure retention; Step five: loosen all the sliding grooves, remove the positioning bolt (31), move the sliding plate to the left and right sides to contact the first limiting plate (9), move the push plate (23) to the specified scale of the left side sliding plate (7), take out the negative Poisson's ratio honeycomb strip, remove the trapezoidal block (32), clean the oil stains on the surface of the forming platform and the negative Poisson's ratio honeycomb strip, and the negative Poisson's ratio honeycomb preparation process is completed.

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