Negative Poisson's ratio metal honeycomb ultra-thin strip forming platform and using method thereof

Abstract

The invention provides a negative poisson ratio metal honeycomb ultra-thin strip forming platform and a using method thereof. 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 invention 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 Art

[0002] Negative Poisson's ratio materials are usually metal corrugated plates formed by 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 pulled and contract laterally when compressed. Therefore, negative Poisson's ratio materials can disperse stress more evenly when impacted, and have better buffering and energy absorption capabilities than conventional materials. In addition, negative Poisson's ratio materials have also significantly improved in shear stiffness, fracture toughness and bending properties. Due to its excellent properties, negative Poisson's ratio materials have great application potential in aerospace, protective equipment, medical devices, etc.

[0003] The inner trapezoidal honeycomb band is a common structural unit with negative Poisson's ratio characteristics. It has special embedded structural characteristics, so it is difficult to prepare with existing molds. At present, there are two main methods for preparing inner trapezoidal honeycomb bands: the first method is the bending process, including manual bending and mechanical bending. Manual bending has problems such as low geometric dimensional accuracy, 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 achieve mass production. Mechanical bending has the problem of interference between the punch and the honeycomb band.

[0004] The second method is special processing, which is mainly divided into metal additive manufacturing and laser cutting. Metal additive manufacturing equipment is expensive and has a long production cycle, especially when manufacturing extreme-sized and high-precision parts. The surface of the printed parts is usually rough and requires additional post-processing steps to improve the surface finish. Moreover, not all materials are suitable for metal additive manufacturing. When laser cutting technology is used to process such thin strip parts, the high temperature generated during the cutting process may cause 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 invention is committed to solving the problems of low forming accuracy and slow production efficiency of extremely thin metal honeycomb strips with negative Poisson's ratio (thickness less than or equal to 0.1 mm). Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a negative Poisson's ratio metal honeycomb ultra-thin strip forming platform and its use method, which can improve the quality of parts. At the same time, the pressure holding system of the forming platform can also effectively reduce the springback of parts and improve the dimensional accuracy of parts.

[0006] To achieve the above-mentioned purpose, the present invention 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 pressure plate (2), a support block (3), a first fixed block (4), a limit block (5), a first guide column (6), a left slide plate (7), a base (8), a first limit 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-grained handle (15), a third slide groove (16), an upper pressure plate (17), a second limit 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 fixed block (25), a second guide column (26), a right slide plate (27), a forming slider (28), a bushing (29), a pad (30), a positioning bolt (31) and a trapezoidal block (32); Two groups of support blocks (3) are fixed on both sides of the front and rear ends of the lower pressing plate (2), and the upper pressing plate (17) is fixed on the support blocks (3) by bolts. The distance between the upper pressing plate (17) and the lower pressing plate (2) is the height of the part after forming. The distance 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 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's ratio honeycomb belt.

[0007] In a preferred embodiment, two first fixing blocks (4) are located at the front end of the left slide plate (7), and the limit block (5) and the second fixing block (25) are fixed on the left slide plate (7); both ends of the first guide column (6) are respectively fixed on the limit block (5) and the second fixing block (25), and the limit block (5) also serves to limit the maximum displacement of the right end of the forming slide block (28); both ends of the second guide column (26) are located on the first fixing block (4) and the push plate (23), and one side of the first fixing block (4) is fixed by bolts, and the other side is not fixed, so as to assist the movement of the push plate (23).

[0008] In a preferred embodiment, the forming slider (28) slides freely on the first guide column (6) and the second guide column (26) to apply forming pressure to the positive Poisson's ratio honeycomb belt, and its surface is mirror-finished to ensure high-quality forming effect; the pad (30) prevents the forming slider 28 from sinking due to the long front end, ensuring smooth movement of the slider, and a bushing (29) is installed between the forming slider (28) and the first guide column (6) to reduce wear between the forming slider (28) and the first guide column (6).

[0009] In a preferred embodiment, the height of the forming slider (28) is higher than the prefabricated positive Poisson's ratio honeycomb belt, and the front end of the forming slider (28) is provided with a rounded corner so that the height of the end face isosceles trapezoid is lower than the positive Poisson's ratio honeycomb belt.

[0010] In a preferred embodiment, the left side slide plate (7) is connected to the base (8) via a first guide rail (10) and a first slide groove (11), and a first limit plate (9) and a second limit plate (18) are fixed to the base via bolts to limit the movement of the left side slide plate (7).

[0011] In a preferred embodiment, the second slide groove (12) and the third slide groove (16) are connected by a rib plate (21) and a connecting plate (22), and a straight-grained 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 limit the movement of the second slide groove (12); the third guide rail (19) and the fourth guide rail (24) are fixed by bolts, and the push plate (23) is connected to the fourth slide groove (20) so that the push plate (23) moves with the left slide plate (7). The straight-grained 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 a positioning bolt (31) and is used for positioning and fixing the positive Poisson's ratio honeycomb belt.

[0012] The present invention also provides a method for using a negative Poisson's ratio metal honeycomb ultra-thin strip forming platform, which uses the above-mentioned negative Poisson's ratio metal honeycomb ultra-thin strip forming platform and comprises the following steps: Step 1: First, spray lubricating oil on 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) to lubricate and reduce friction resistance; place the positive Poisson's ratio honeycomb belt to be processed into the upper pressing plate (17) and the lower pressing plate (2) from the left side, and determine the forming length according to the scale on one side of the upper pressing plate (17) to ensure that the processing range meets the requirements; use a trapezoidal block (32) and a positioning bolt (31) to fix the positive Poisson's ratio honeycomb belt to prevent movement during the forming process; Step 2: Adjust the positions of the forming sliders (28) on both sides according to the scales on the left slider (7) and the right slider (27), first move the left slider (7) to the second limit plate (18) through the straight-grained handle (15), and then move the right slider (27). During the movement of the right slider (27), the rounded corner portion of the front end of the forming slider (28) first contacts the positive Poisson's ratio honeycomb band and is gradually squeezed. As the forming slider (28) continues to move forward, the height of the positive Poisson's ratio honeycomb band is stretched to be consistent with the height of the trapezoidal portion of the forming slider (28). At this time, the height of the trapezoid inside the positive Poisson's ratio honeycomb band is the required height of the negative Poisson's ratio honeycomb band after forming, so there is no need to adjust the spacing between the upper and lower pressing plates during the forming process; when the trapezoidal portions of the forming slider (28) are all in the trapezoidal groove of the positive Poisson's ratio honeycomb band, fix the first slide groove (11), the third slide groove (16) and the fourth slide groove (20); Step 3: Move the push plate (23) along the direction of the second guide rail (14) through the straight-grained handle (15) so that the push plate (23) pushes the forming slider forward, exerts pressure on the positive Poisson's ratio honeycomb belt, and causes the positive Poisson's ratio honeycomb belt to bend and deform; Step 4: Observe the scale on the left slide plate (7), and when the stroke is reached, the forming is completed, and fix the second slide groove (12) to maintain the pressure; Step 5: Loosen all the slides, remove the positioning bolts (31), move the slide plate to both sides until it contacts the first limit plate (9), move the push plate (23) to the specified scale of the left slide plate (7), remove the negative Poisson's ratio honeycomb belt, remove the trapezoidal block (32), clean the oil stains on the surface of the forming platform and the negative Poisson's ratio honeycomb belt, and the negative Poisson's ratio honeycomb preparation process is now complete.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The invention has a simple structure, low manufacturing cost, convenient and quick use, and high production efficiency, and can quickly produce a large number of negative Poisson's ratio honeycomb belts, and has high application value; The present invention can meet the preparation of negative Poisson's ratio honeycomb strips of different sizes by replacing the forming slider and the support block, and the surface of the forming slider is mirror-finished to achieve a higher surface finish, reducing the need for subsequent surface treatment; The forming slide block of the present invention has high processing accuracy, which can ensure the consistency of the size and shape of each honeycomb unit. At the same time, after forming, it can be fixed and pressure-maintained through the fixing holes on the guide rail, thereby reducing the springback of the parts and maintaining the size accuracy and shape stability. After the negative Poisson's ratio honeycomb belt of the present invention is formed, the finished product can be easily taken out by only driving the forming slider to withdraw to both sides through the slide plate, thereby avoiding the problem that the parts and the punch cannot be smoothly taken out in the stamping or bending forming process; The distance between the upper and lower pressing plates is the required height of the part after forming, which can well ensure the flatness of the upper and lower surfaces of the negative Poisson's ratio honeycomb belt after forming, so that subsequent connection processing can be better performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The overall three-dimensional diagram of the negative Poisson's ratio metal honeycomb ultra-thin strip forming platform of the preferred embodiment of the present invention; Figure 2 It is a partial schematic diagram of the forming platform after the forming of the preferred embodiment of the present invention is completed; Figure 3 Schematic diagram of a negative Poisson's ratio honeycomb band according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0017] It should be noted that the terms used herein are only for describing 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. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0018] The present invention first places a positive Poisson's ratio honeycomb belt in a forming area, and uses multiple sets of trapezoidal sliders to apply uniform pressure to it, so that it forms an embedded trapezoidal structure during the plastic deformation process. After the forming is completed, it is subjected to pressure holding treatment through a fixed slide to reduce material rebound, and finally a high-precision negative Poisson's ratio honeycomb belt is obtained. Figure 1 The overall three-dimensional diagram of the negative Poisson's ratio metal honeycomb ultra-thin strip forming platform is attached. Figure 2 This is a schematic diagram of the local area after forming. Figure 3 The negative Poisson's ratio honeycomb strip obtained after forming. The overall structure of the negative Poisson's ratio metal honeycomb ultra-thin strip forming platform includes: a positive Poisson's ratio honeycomb strip 1, a lower pressure plate 2, a support block 3, a first fixed block 4, a limit block 5, a first guide column 6, a left slide 7, a base 8, a first limit 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 handle 15, a third slide groove 16, an upper pressure plate 17, a second limit 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 fixed block 25, a second guide column 26, a right slide 27, a forming slide 28, a bushing 29, a pad 30, a positioning bolt 31, and a trapezoidal block 32.

[0019] The connection relationship and functions between the various parts are as follows: The two sides of the forming platform are symmetrically distributed as a whole, except for the forming slider 28. Two groups of support blocks 3 are fixed to the front and rear ends of the lower pressing plate 2 by bolts, and the upper pressing plate 17 is fixed to the support blocks 3 by bolts. The distance between the upper pressing plate 17 and the lower pressing plate 2 is the height of the part after forming. The distance is controlled by the support block 2, so the size of the support 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 upper and lower pressing plate forming areas is slightly wider than the in-plane width of the positive Poisson's ratio honeycomb belt. The two first fixed blocks 4 are located at the front end of the left slide 7, and the limit block 5 and the second fixed block 25 are fixed on the left slide 7. The two ends of the first guide column 6 are respectively fixed to the limit block 5 and the second fixed block 25 by bolts, and the limit 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 fixed block 4 and the push plate 23, and are fixed by bolts on one side of the first fixed block 4, and are not fixed on the other side, so as to assist the movement of the push plate 23.

[0020] The forming slider 28 can slide freely 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 belt. Its surface is mirror-finished to ensure high-quality forming effects. The pad 30 is to prevent the forming slider 28 from sinking due to the long front end and ensure the smooth movement of the slider. A 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 rounded corner so that the height of the end face isosceles trapezoid is lower than the positive Poisson's ratio honeycomb belt to solve the interference caused by the height inconsistency between the two.

[0021] The left side slide 7 is connected to the base 8 through the first guide rail 10 and the first slide groove 11. The first limit plate 9 and the second limit plate 18 are fixed to the base by bolts to limit the movement of the left side slide 7. The second slide groove 12 and the third slide groove 16 are connected by the rib plate 21 and the connecting plate 22. At the same time, a straight-grained handle 15 is installed on the rib plate 21 to facilitate the control of the overall movement. The front end of the left side slide 7 is also provided with a baffle 13 to limit the movement of the second slide groove 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 groove 20 so that the push plate 23 can move with the left side slide 7. The straight-grained handle 15 on the push plate 23 is used to control the left and right movement of the slide. The trapezoidal block 32 is connected to the upper pressure plate 17 by the positioning bolt 31, which is used for positioning and fixing the positive Poisson's ratio honeycomb belt.

[0022] Taking the preparation of a negative Poisson's ratio honeycomb strip with a thickness of 0.1 mm as an example, the present invention is further described in detail, and the specific steps are as follows: Step 1: First, spray lubricating oil on 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 to lubricate and reduce friction resistance. Place the positive Poisson's ratio honeycomb belt to be processed into the upper pressing plate 17 and the lower pressing plate 2 from the left side, and determine the forming length according to the scale on one side of the upper pressing plate 17 to ensure that the processing range meets the requirements. Use the trapezoidal block 32 and the positioning bolt 31 to fix the positive Poisson's ratio honeycomb belt to prevent it from moving during the pressing process of the forming sliders (28) on both sides; Step 2: Adjust the positions of the forming sliders 28 on both sides according to the scales on the left side slider 7. Move the left side slider 7 to the second limit plate 18 through the straight-grained handle 15, and then move the right side slider 27. During the movement of the right side slider 27, the rounded corners at the front end of the forming slider 28 first contact the positive Poisson's ratio honeycomb band and gradually extrude it. As the forming slider 28 continues to move forward, the height of the positive Poisson's ratio honeycomb band is stretched to the same height as the trapezoidal part of the forming slider 28. At this time, the height of the trapezoid inside the positive Poisson's ratio honeycomb band is the required height of the negative Poisson's ratio honeycomb band after forming. Therefore, there is no need to adjust the spacing between the upper and lower pressure plates during the forming process. When the trapezoidal parts of the forming slider 28 are all in the trapezoidal grooves of the positive Poisson's ratio honeycomb band, fix the first slide 11, the third slide 16, and the fourth slide 20; Step 3: Move the push plate 23 along the direction of the second guide rail 14 through the straight-grained handle 15, so that it pushes the forming slider forward, exerts pressure on the positive Poisson's ratio honeycomb belt to bend and deform the positive Poisson's ratio honeycomb belt; Step 4: Observe the scale on the left slide 7, and when the stroke is reached, the forming is completed, and fix the second slide groove 12 to maintain the pressure; Step 5: Loosen all the slides, remove the positioning bolts 31, move the slide plates to both sides until they are in contact with the first limit 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 belt, remove the trapezoidal block 32, clean the oil stains on the surface of the forming platform and the negative Poisson's ratio honeycomb belt, and the negative Poisson's ratio honeycomb preparation process is now complete.

Claims

1. A negative Poisson's ratio metal honeycomb ultra-thin strip forming platform, characterized in that: It comprises a positive Poisson's ratio honeycomb belt (1), a lower pressure plate (2), a support block (3), a first fixed block (4), a limit block (5), a first guide column (6), a left slide plate (7), a base (8), a first limit 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-grained handle (15), a third slide groove (16), an upper pressure plate (17), a second limit 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 fixed block (25), a second guide column (26), a right slide plate (27), a forming slide block (28), a bushing (29), a pad (30), a positioning bolt (31) and a trapezoidal block (32); Two groups of support blocks (3) are fixed on both sides of the front and rear ends of the lower pressing plate (2), and the upper pressing plate (17) is fixed on the support blocks (3) by bolts. The distance between the upper pressing plate (17) and the lower pressing plate (2) is the height of the part after forming. The distance 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 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's ratio honeycomb belt.

2. A negative Poisson's ratio metal honeycomb ultra-thin 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 limit block (5) and the second fixing block (25) are fixed on the left slide plate (7); two ends of the first guide column (6) are respectively fixed on the limit block (5) and the second fixing block (25), and the limit block (5) also serves to limit the maximum displacement of the right end of the forming slide block (28); two ends of the second guide column (26) are located on the first fixing block (4) and the push plate (23), and one side of the first fixing block (4) is fixed by bolts, and the other side is not fixed, so as to assist the movement of the push plate (23).

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

4. A negative Poisson's ratio metal honeycomb ultra-thin strip forming platform according to claim 3, characterized in that: The height of the forming slider (28) is higher than the prefabricated positive Poisson's ratio honeycomb belt, and a rounded corner is provided at the front end of the forming slider (28), so that the height of the end face isosceles trapezoid is lower than the positive Poisson's ratio honeycomb belt.

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

6. A negative Poisson's ratio metal honeycomb ultra-thin strip forming platform according to claim 5, characterized in that: The second slide groove (12) and the third slide groove (16) are connected by a rib plate (21) and a connecting plate (22), and a straight-grained handle (15) is installed on the rib plate (21) to facilitate the control of the overall movement. A baffle plate (13) is also provided at the front end of the left slide plate (7) to limit the movement of the second slide groove (12); the third guide rail (19) and the fourth guide rail (24) are fixed by bolts, and the push plate (23) is connected to the fourth slide groove (20) so that the push plate (23) moves with the left slide plate (7). The straight-grained 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 a positioning bolt (31) and is used for positioning and fixing the positive Poisson's ratio honeycomb belt.

7. A method for using a negative Poisson's ratio metal honeycomb ultra-thin strip forming platform, characterized in that A negative Poisson's ratio metal honeycomb ultra-thin strip forming platform as described in any one of claims 1 to 6 is used, comprising the following steps: Step 1: First, spray lubricating oil on 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) to lubricate and reduce friction resistance; place the positive Poisson's ratio honeycomb belt to be processed into the upper pressing plate (17) and the lower pressing plate (2) from the left side, and determine the forming length according to the scale on one side of the upper pressing plate (17) to ensure that the processing range meets the requirements; use a trapezoidal block (32) and a positioning bolt (31) to fix the positive Poisson's ratio honeycomb belt to prevent it from moving during the pressing process of the forming sliders (28) on both sides; Step 2: Adjust the positions of the forming sliders (28) on both sides according to the scales on the left slider (7) and the right slider (27), first move the left slider (7) to the second limit plate (18) through the straight-grained handle (15), and then move the right slider (27). During the movement of the right slider (27), the rounded corner portion of the front end of the forming slider (28) first contacts the positive Poisson's ratio honeycomb band and is gradually squeezed. As the forming slider (28) continues to move forward, the height of the positive Poisson's ratio honeycomb band is stretched to be consistent with the height of the trapezoidal portion of the forming slider (28). At this time, the height of the trapezoid inside the positive Poisson's ratio honeycomb band is the required height of the negative Poisson's ratio honeycomb band after forming, so there is no need to adjust the spacing between the upper and lower pressing plates during the forming process; when the trapezoidal portions of the forming slider (28) are all in the trapezoidal groove of the positive Poisson's ratio honeycomb band, fix the first slide groove (11), the third slide groove (16) and the fourth slide groove (20); Step 3: Move the push plate (23) along the direction of the second guide rail (14) through the straight-grained handle (15) so that the push plate (23) pushes the forming slider forward, exerts pressure on the positive Poisson's ratio honeycomb belt, and causes the positive Poisson's ratio honeycomb belt to bend and deform; Step 4: Observe the scale on the left slide plate (7), and when the stroke is reached, the forming is completed, and fix the second slide groove (12) to maintain the pressure; Step 5: Loosen all the slides, remove the positioning bolts (31), move the slide plate to both sides until it contacts the first limit plate (9), move the push plate (23) to the specified scale of the left slide plate (7), remove the negative Poisson's ratio honeycomb belt, remove the trapezoidal block (32), clean the oil stains on the surface of the forming platform and the negative Poisson's ratio honeycomb belt, and the negative Poisson's ratio honeycomb preparation process is now complete.

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