阅读说明：本技术 一种新型点阵芯子结构及其采用的切割嵌锁制备方法 (Novel lattice core structure and cutting interlocking preparation method adopted by same ) 是由 冯丽佳 吴林志 张阿漫 王诗平 明付仁 于国财 于 2021-08-23 设计创作，主要内容包括：一种新型点阵芯子结构及其采用的切割嵌锁制备方法,涉及点阵夹芯板的芯材领域。本发明是为了解决随着芯板厚度的增加,导致现有的沙漏点阵结构面板抗屈曲性能差的问题。一种新型点阵芯子结构包括多条第一横向嵌锁条、多条第二横向嵌锁条、多条第一纵向嵌锁条和多条第二纵向嵌锁条,所述的第一横向嵌锁条与第二横向嵌锁条依次交替等间距平行设置,形成横向组嵌锁条；所述的第一纵向嵌锁条和第二纵向嵌锁条依次交替等间距平行设置,形成纵向组嵌锁条；横向组嵌锁条与纵向组嵌锁条之间相互垂直设置并卡合连接。本发明主要用于形成夹芯板的芯材。(A novel lattice core structure and a cutting interlocking preparation method adopted by the novel lattice core structure relate to the field of core materials of lattice sandwich boards. The invention aims to solve the problem that the traditional hourglass lattice structure panel has poor buckling resistance along with the increase of the thickness of a core plate. A novel lattice core structure comprises a plurality of first transverse interlocking strips, a plurality of second transverse interlocking strips, a plurality of first longitudinal interlocking strips and a plurality of second longitudinal interlocking strips, wherein the first transverse interlocking strips and the second transverse interlocking strips are sequentially arranged in parallel at equal intervals in an alternating mode to form transverse assembling interlocking strips; the first longitudinal interlocking strips and the second longitudinal interlocking strips are sequentially arranged in parallel at equal intervals in an alternating mode to form longitudinal group interlocking strips; the transverse group embedded locking strips and the longitudinal group embedded locking strips are mutually and vertically arranged and are connected in a clamping way. The invention is mainly used for forming the core material of the sandwich board.)

1. A novel dot matrix core structure is characterized in that: the lock comprises a plurality of first transverse interlocking strips (1), a plurality of second transverse interlocking strips (2), a plurality of first longitudinal interlocking strips (13) and a plurality of second longitudinal interlocking strips (14), wherein the first transverse interlocking strips (1) and the second transverse interlocking strips (2) are sequentially arranged in parallel at equal intervals in an alternating mode to form transverse assembling interlocking strips; the first longitudinal interlocking strips (13) and the second longitudinal interlocking strips (14) are sequentially arranged in parallel at equal intervals in an alternating mode to form longitudinal combined interlocking strips; the transverse group embedded locking strips and the longitudinal group embedded locking strips are mutually and vertically arranged and are connected in a clamping way.

2. A novel lattice core structure in accordance with claim 1, wherein: the first transverse interlocking strip (1), the second transverse interlocking strip (2), the first longitudinal interlocking strip (13) and the second longitudinal interlocking strip (14) are all composed of a plurality of first dot matrix units (5) and a plurality of second dot matrix units (6);

the first transverse interlocking strip (1) is formed by sequentially and transversely arranging a first dot matrix unit (5) and a second dot matrix unit (6) side by side alternately and integrally connected end to end;

the second transverse interlocking strips (2) are formed by sequentially and transversely arranging second dot matrix units (6) and first dot matrix units (5) side by side alternately and integrally connected end to end;

the lengths of the first transverse interlocking strip (1) and the second transverse interlocking strip (2) are the same;

the first longitudinal embedded locking strip (13) is formed by sequentially and transversely arranging the second dot matrix unit (6) and the first dot matrix unit (5) side by side alternately, turning over the second dot matrix unit up and down and sequentially connecting the head and the tail of the second dot matrix unit into a whole;

the second longitudinal interlocking strip (14) is formed by sequentially and transversely arranging the first dot matrix unit (5) and the second dot matrix unit (6) side by side alternately, turning over the first dot matrix unit up and down and sequentially connecting the head and the tail of the first dot matrix unit and the second dot matrix unit into a whole;

the first longitudinal interlocking strip (13) and the second longitudinal interlocking strip (14) have the same length.

3. A novel lattice core structure according to claim 2, characterized in that: the sum of the first transverse interlocking strips (1) and the second transverse interlocking strips (2) is equal to the total sum of the second dot matrix units (6) and the first dot matrix units (5) in the first longitudinal interlocking strips (13); the sum of the first longitudinal interlocking strips (13) and the second longitudinal interlocking strips (14) is equal to the total sum of the second dot matrix units (6) and the first dot matrix units (5) in the first transverse interlocking strips (1).

4. A novel lattice core structure according to claim 3, characterized in that: the first lattice unit (5) comprises a second X piece (4) and a first X piece (3) which are arranged oppositely up and down, and two support legs at the lower end of the second X piece (4) are respectively connected with two support legs at the upper end of the first X piece (3) and are integrally formed;

the second dot matrix unit (6) comprises a third X piece (7) and a second X piece (4) which are oppositely arranged up and down, and two support legs at the lower end of the third X piece (7) are respectively connected with two support legs at the upper end of the second X piece (4) and are integrally formed.

5. A novel lattice core structure according to claim 4, wherein: two support legs at the top end between the adjacent first dot matrix unit (5) and the second dot matrix unit (6) are connected and integrally formed to form an upper boss (9), four support legs in the middle are connected and integrally formed to form a connecting node (11), and two support legs at the bottom end are connected and integrally formed to form a lower boss (10).

6. A novel lattice core structure in accordance with claim 5, wherein: a half notch (4-1) is arranged above the intersection point of the second X piece (4); a second whole notch (7-1) is formed at the intersection point of the third X piece (7);

the groove width of the second whole notch (7-1), the groove width of the half notch (4-1), the thickness of the first transverse interlocking strip (1), the thickness of the second transverse interlocking strip (2), the thickness of the first longitudinal interlocking strip (13) and the thickness of the second longitudinal interlocking strip (14) are the same.

7. A novel lattice core structure as defined in claim 6, wherein: the thickness of the first transverse interlocking strip (1), the second transverse interlocking strip (2), the first longitudinal interlocking strip (13) and the second longitudinal interlocking strip (14) ranges from 0.1 mm to 10 mm.

8. A novel lattice core structure as described in claim 7, wherein: the intersection point of the first X piece (3) is provided with a first whole notch (3-1), the upper boss (9) and the lower boss (10) are respectively provided with a third whole notch, and the width of the first whole notch (3-1) and the width of the third whole notch are both 0.05 mm.

9. A method for preparing a novel lattice core structure as described in claim 8 by cutting interlocking, characterized in that: the method comprises the following steps:

cutting the interlocking bar: cutting a plurality of superposed plates into a plurality of same interlocking strips by using a wire cut electric discharge machine, wherein the cutting speed of the wire cut electric discharge machine is 3.5 mm/min; the interlocking strips are formed by horizontally arranging a first dot matrix unit (5) and a second dot matrix unit (6) side by side alternately and sequentially connecting the heads and the tails of the first dot matrix unit and the second dot matrix unit;

step two: cutting the embedded locking bar: dividing the interlocking bar into a plurality of first transverse interlocking bars (1), a plurality of second transverse interlocking bars (2), a plurality of first longitudinal interlocking bars (13) and a plurality of second longitudinal interlocking bars (14) by using an electric spark cutting machine;

step three: assembling a dot matrix core: sequentially arranging the first transverse interlocking strips (1) and the second transverse interlocking strips (2) alternately in parallel at equal intervals to form transverse combined interlocking strips; sequentially arranging the first longitudinal interlocking strips (13) and the second longitudinal interlocking strips (14) in parallel at equal intervals alternately to form longitudinal combined interlocking strips; the transverse group embedded locking strips and the longitudinal group embedded locking strips are arranged vertically; half notches (4-1) of first dot matrix units (5) in the transverse group of interlocking strips penetrate through second whole notches (7-1) of second dot matrix units (6) opposite to each other in the longitudinal group of interlocking strips, and the first dot matrix units (5) in the transverse group of interlocking strips are connected with the second dot matrix units (6) opposite to each other in the longitudinal group of interlocking strips through the clamping of the two half notches (4-1) and the embedding of the second whole notches (7-1) and the first whole notches (3-1); the half notches (4-1) of the first dot matrix units (5) in the longitudinal group of the interlocking strips penetrate through the second whole notches (7-1) of the corresponding second dot matrix units (6) in the transverse group of the interlocking strips, and the first dot matrix units (5) in the longitudinal group of the interlocking strips and the corresponding second dot matrix units (6) in the transverse group of the interlocking strips are connected through the clamping of the two half notches (4-1) and the embedding of the second whole notches (7-1) and the first whole notches (3-1).

10. A method of making the novel lattice core structure of claim 7 by cutting interlocking, characterized by: the method comprises the following steps:

cutting the interlocking bar: cutting each plate into interlocking strips by using a laser cutting machine in sequence, wherein the interlocking strips are transversely arranged side by side alternately by a first dot matrix unit (5) and a second dot matrix unit (6) and are sequentially connected end to form an integral body;

step two: cutting the embedded locking bar: dividing the interlocking bar into a plurality of first transverse interlocking bars (1), a plurality of second transverse interlocking bars (2), a plurality of first longitudinal interlocking bars (13) and a plurality of second longitudinal interlocking bars (14) by using a laser cutting machine;

step three: assembling a dot matrix core: sequentially arranging the first transverse interlocking strips (1) and the second transverse interlocking strips (2) alternately in parallel at equal intervals to form transverse combined interlocking strips; sequentially arranging the first longitudinal interlocking strips (13) and the second longitudinal interlocking strips (14) in parallel at equal intervals alternately to form longitudinal combined interlocking strips; the transverse group embedded locking strips and the longitudinal group embedded locking strips are arranged vertically; half notches (4-1) of first dot matrix units (5) in the transverse group of interlocking strips penetrate through second whole notches (7-1) of second dot matrix units (6) opposite to each other in the longitudinal group of interlocking strips, and the first dot matrix units (5) in the transverse group of interlocking strips are connected with the second dot matrix units (6) opposite to each other in the longitudinal group of interlocking strips through clamping of the two half notches (4-1) and embedding of the second whole notches (7-1) and the intersection points of the first X pieces (3); the half notches (4-1) of the first dot matrix units (5) in the longitudinal group of the interlocking strips penetrate through the second whole notches (7-1) of the corresponding second dot matrix units (6) in the transverse group of the interlocking strips, and the first dot matrix units (5) in the longitudinal group of the interlocking strips are connected with the corresponding second dot matrix units (6) in the transverse group of the interlocking strips through the clamping of the two half notches (4-1) and the embedding of the intersection points of the second whole notches (7-1) and the first X-shaped piece (3).

Technical Field

The invention relates to the field of core materials of dot matrix sandwich boards, in particular to a novel dot matrix core structure and a cutting interlocking preparation method adopted by the dot matrix core structure.

Background

The light lattice structure has the composite multifunctional development characteristics of light weight, high rigidity and high strength, energy absorption, noise reduction, stealth, thermal control and the like, is widely researched and is applied to the advanced spacecraft structure, so that the light lattice structure has great potential to be applied to the fields of aerospace and ship sea. The research on the lattice structure mainly focuses on pyramid lattice structures with excellent performances in all aspects, and the pyramid lattice structures are found to show excellent mechanical properties. However, the pyramid lattice structure has a relatively wide pitch of nodes connecting the panels, and the panels have relatively weak in-plane tensile resistance, and the pyramid lattice structure core rod members have a relatively large slenderness ratio, so that the rod members are prone to premature rod destabilization failure under compressive load, and the structural bearing capacity cannot be fully exerted. Research shows that compared with a pyramid lattice structure, the reinforced hourglass-shaped lattice structure (shown in fig. 8) has advantages in both aspects, the node distance is smaller, the buckling resistance of the core rod pieces is higher, the defects of the traditional pyramid lattice structure can be overcome, premature failure is avoided, the bearing efficiency is improved, and therefore the pyramid lattice structure has stronger mechanical bearing capacity. However, as the thickness of the core plate is increased, the local buckling failure mode of the panel with the hourglass lattice structure can still be clearly observed, so that the design of the hourglass lattice structure needs to be improved, and the buckling resistance of the panel needs to be further improved; therefore, the invention provides a novel lattice core material and a cutting-interlocking assembling method for preparing the lattice core material.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: along with the increase of the thickness of the core plate, the traditional hourglass lattice structure panel has poor buckling resistance, and a novel lattice core structure and a cutting interlocking preparation method adopted by the novel lattice core structure are further provided.

The invention is realized by the following scheme:

a novel lattice core structure comprises a plurality of first transverse interlocking strips, a plurality of second transverse interlocking strips, a plurality of first longitudinal interlocking strips and a plurality of second longitudinal interlocking strips, wherein the first transverse interlocking strips and the second transverse interlocking strips are sequentially arranged in parallel at equal intervals in an alternating mode to form transverse assembling interlocking strips; the first longitudinal interlocking strips and the second longitudinal interlocking strips are sequentially arranged in parallel at equal intervals in an alternating mode to form longitudinal group interlocking strips; the transverse group embedded locking strips and the longitudinal group embedded locking strips are mutually and vertically arranged and are connected in a clamping way.

Furthermore, the first transverse interlocking strip, the second transverse interlocking strip, the first longitudinal interlocking strip and the second longitudinal interlocking strip are all composed of a plurality of first lattice units and a plurality of second lattice units; the first transverse interlocking strip is formed by sequentially and transversely arranging the first dot matrix unit and the second dot matrix unit side by side alternately and integrally connecting the first dot matrix unit and the second dot matrix unit end to end; the second transverse interlocking strip is formed by sequentially and transversely arranging the second dot matrix units and the first dot matrix units side by side alternately and integrally connecting the second dot matrix units and the first dot matrix units end to end; the first transverse interlocking strip and the second transverse interlocking strip have the same length; the first longitudinal interlocking strip is formed by sequentially and transversely arranging the second dot matrix units and the first dot matrix units side by side alternately, turning the second dot matrix units up and down and sequentially connecting the first dot matrix units and the first dot matrix units end to end; the second longitudinal interlocking strip is formed by sequentially and transversely arranging the first dot matrix unit and the second dot matrix unit side by side alternately, turning the first dot matrix unit and the second dot matrix unit up and down and sequentially connecting the first dot matrix unit and the second dot matrix unit end to end; the first longitudinal interlocking strip and the second longitudinal interlocking strip have the same length.

Furthermore, the sum of the first transverse interlocking strip and the second transverse interlocking strip is equal to the total sum of the second dot matrix units and the first dot matrix units in the first longitudinal interlocking strip; the sum of the first longitudinal interlocking strips and the second longitudinal interlocking strips is equal to the total sum of the second dot matrix units and the first dot matrix units in the first transverse interlocking strips.

Furthermore, the first lattice unit comprises a second X piece and a first X piece which are oppositely arranged up and down, and two support legs at the lower end of the second X piece and two support legs at the upper end of the first X piece are respectively connected and integrally formed; the second dot matrix unit comprises a third X piece and a second X piece which are arranged up and down oppositely, and two support legs at the lower end of the third X piece and two support legs at the upper end of the second X piece are respectively connected and integrally formed.

Furthermore, two support legs at the top end between the adjacent first dot matrix unit and the second dot matrix unit are connected and integrally formed to form an upper boss, four support legs in the middle are connected and integrally formed to form a connection node, and two support legs at the bottom end are connected and integrally formed to form a lower boss.

Furthermore, a half notch is formed above the intersection point of the second X piece; a second whole notch is formed at the intersection point of the third X-piece; the groove width of the second whole groove opening, the groove width of the half groove opening, the thickness of the first transverse interlocking strip, the thickness of the second transverse interlocking strip, the thickness of the first longitudinal interlocking strip and the thickness of the second longitudinal interlocking strip are the same.

Further, the thickness of the first transverse interlocking strip, the second transverse interlocking strip, the first longitudinal interlocking strip and the second longitudinal interlocking strip ranges from 0.1 mm to 10 mm.

Furthermore, a first whole notch is formed in the intersection point of the first X piece, a third whole notch is formed in the positions of the upper boss and the lower boss respectively, and the groove width of the first whole notch and the groove width of the third whole notch are both 0.05 mm.

The method for preparing the novel lattice core structure by cutting the interlocking comprises the following steps:

cutting the interlocking bar: cutting a plurality of superposed plates into a plurality of same interlocking strips by using a wire cut electric discharge machine, wherein the cutting speed of the wire cut electric discharge machine is 3.5 mm/min; the embedded locking strip is formed by horizontally arranging a first dot matrix unit and a second dot matrix unit side by side alternately and sequentially connecting the first dot matrix unit and the second dot matrix unit end to end;

step two: cutting the embedded locking bar: dividing the interlocking bar into a plurality of first transverse interlocking bars, a plurality of second transverse interlocking bars, a plurality of first longitudinal interlocking bars and a plurality of second longitudinal interlocking bars by using an electric spark cutting machine;

step three: assembling a dot matrix core: sequentially and alternately arranging the first transverse interlocking strips and the second transverse interlocking strips in parallel at equal intervals to form transverse group interlocking strips; sequentially and alternately arranging the first longitudinal interlocking strips and the second longitudinal interlocking strips in parallel at equal intervals to form longitudinal group interlocking strips; the transverse group embedded locking strips and the longitudinal group embedded locking strips are arranged vertically; the half notches of the first dot matrix units in the transverse group of the interlocking strips penetrate through the second whole notches of the opposite second dot matrix units in the longitudinal group of the interlocking strips, and the first dot matrix units in the transverse group of the interlocking strips and the opposite second dot matrix units in the longitudinal group of the interlocking strips are connected through the clamping of the two half notches and the embedding of the second whole notches and the first whole notches; the half-notch of the first dot matrix unit in the longitudinal group of the interlocking strips penetrates through the second whole-notch of the corresponding second dot matrix unit in the transverse group of the interlocking strips, and the first dot matrix unit in the longitudinal group of the interlocking strips and the corresponding second dot matrix unit in the transverse group of the interlocking strips are connected through the clamping of the two half-notches and the embedding of the second whole-notch and the first whole-notch.

The method for preparing the novel lattice core structure by cutting the interlocking comprises the following steps:

cutting the interlocking bar: cutting each plate into interlocking strips by using a laser cutting machine, wherein the interlocking strips are formed by horizontally arranging a first dot matrix unit and a second dot matrix unit side by side alternately and sequentially connecting the first dot matrix unit and the second dot matrix unit end to end;

step two: cutting the embedded locking bar: dividing the interlocking bar into a plurality of first transverse interlocking bars, a plurality of second transverse interlocking bars, a plurality of first longitudinal interlocking bars and a plurality of second longitudinal interlocking bars by using a laser cutting machine;

step three: assembling a dot matrix core: sequentially and alternately arranging the first transverse interlocking strips and the second transverse interlocking strips in parallel at equal intervals to form transverse group interlocking strips; sequentially and alternately arranging the first longitudinal interlocking strips and the second longitudinal interlocking strips in parallel at equal intervals to form longitudinal group interlocking strips; the transverse group embedded locking strips and the longitudinal group embedded locking strips are arranged vertically; the half notches of the first dot matrix units in the transverse group of the interlocking strips penetrate through the second whole notches of the opposite second dot matrix units in the longitudinal group of the interlocking strips, and the first dot matrix units in the transverse group of the interlocking strips and the opposite second dot matrix units in the longitudinal group of the interlocking strips are connected through the clamping of the two half notches and the embedding of the second whole notches and the intersection points of the first X pieces; the half-notch of the first lattice unit in the longitudinal group of the interlocking strips penetrates through the second whole-notch of the corresponding second lattice unit in the transverse group of the interlocking strips, and the first lattice unit in the longitudinal group of the interlocking strips and the corresponding second lattice unit in the transverse group of the interlocking strips are connected through the clamping of the two half-notches and the embedding of the second whole-notch and the intersection point of the first X piece.

The invention has the following effects:

compared with the existing hourglass lattice core material (see fig. 12 to 14), the core material of the invention can effectively improve the node density on the panel under the condition of determining the height of the core material, thereby shortening the distance between nodes, wherein d₂＝1/2d₁，d₂The pitch of the node lines of the lattice core of the invention, d₁The node line spacing of the hourglass dot matrix core material is adopted, namely the number of the nodes is 2 times that of the hourglass dot matrix core material, and after the dot matrix core is connected with the panel, the capability of resisting the local buckling of the panel of the dot matrix structure of the thin panel thick core can be effectively improved;

the lattice core material has the following main advantages that (1) compared with the existing hourglass lattice core material, the core material can improve and enhance the energy absorption performance of the structure. (2) Experiments show that under the in-plane compressive load, when the plate is partially bent and fails, the in-plane compressive maximum load of the lattice structure is obviously higher than that of the existing hourglass lattice structure; (3) when the spark wire cutting machine is used for cutting, the preparation method for cutting the openings of the upper lug boss, the lower lug boss and the like ensures the cutting continuity, can improve the preparation efficiency and reduce the preparation cost.

Drawings

FIG. 1 is a schematic view of a configuration of a first transverse interlocking strip;

FIG. 2 is a schematic view of a second transverse interlocking strip configuration;

FIG. 3 is a schematic view of the configuration of the first longitudinal interlocking strip;

FIG. 4 is a schematic view of a second longitudinal interlocking strip configuration;

FIG. 5 is a schematic structural diagram of a first dot matrix unit;

FIG. 6 is a schematic structural diagram of a second lattice unit;

FIG. 7 is a state view before the transverse group interlocking strips are connected with the longitudinal group interlocking strips;

FIG. 8 is a schematic view of a lattice core material formed after the transverse group interlocking strips and the longitudinal group interlocking strips are connected;

FIG. 9 is a top view of a lattice core;

FIG. 10 is a front view of a lattice core;

FIG. 11 is an isometric view of a dot matrix core;

FIG. 12 is a top view of an hourglass shaped dot matrix core;

FIG. 13 is a front view of an hourglass-shaped lattice core;

figure 14 is an isometric view of an hourglass-shaped dot matrix core.

Detailed Description

The detailed structure and embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The novel lattice core structure comprises a plurality of first transverse interlocking strips 1, a plurality of second transverse interlocking strips 2, a plurality of first longitudinal interlocking strips 13 and a plurality of second longitudinal interlocking strips 14, wherein the first transverse interlocking strips 1 and the second transverse interlocking strips 2 are sequentially arranged in parallel at equal intervals in an alternating mode to form transverse assembling interlocking strips; the first longitudinal interlocking strips 13 and the second longitudinal interlocking strips 14 are sequentially arranged in parallel at equal intervals in an alternating mode to form longitudinal combined interlocking strips; as shown in fig. 7 to 11, the transverse group interlocking strips and the longitudinal group interlocking strips are perpendicular to each other and are connected in a snap fit manner.

As shown in fig. 1 to 4, the first transverse interlocking strip 1, the second transverse interlocking strip 2, the first longitudinal interlocking strip 13 and the second longitudinal interlocking strip 14 are all composed of a plurality of first lattice units 5 and a plurality of second lattice units 6;

as shown in fig. 1, the first transverse interlocking strip 1 is formed by taking a first dot matrix unit 5 as a starting point, and the first dot matrix unit 5 and a second dot matrix unit 6 are arranged transversely and alternately side by side, and the first dot matrix unit 5 and the second dot matrix unit 6 are sequentially connected end to end and integrally formed;

as shown in fig. 2, the second transverse interlocking strip 2 is formed by using a second dot matrix unit 6 as a starting point, and the second dot matrix unit 6 and the first dot matrix unit 5 are arranged side by side and alternately in a transverse direction, and the second dot matrix unit 6 and the first dot matrix unit 5 are sequentially connected end to end and integrally formed;

the lengths of the first transverse interlocking strip 1 and the second transverse interlocking strip 2 are the same, that is, the sum of the first dot matrix unit 5 and the second dot matrix unit 6 in the first transverse interlocking strip 1 is equal to the sum of the first dot matrix unit 5 and the second dot matrix unit 6 in the second transverse interlocking strip 2;

as shown in fig. 3, the first longitudinal interlocking strip 13 is formed by using the second dot matrix unit 6 as a starting point, and the second dot matrix unit 6 and the first dot matrix unit 5 are arranged horizontally and alternately side by side and are turned upside down, and the second dot matrix unit 6 and the first dot matrix unit 5 are sequentially connected end to end and are integrally formed;

as shown in fig. 4, the second longitudinal interlocking strip 14 is formed by using the first dot matrix unit 5 as a starting point, and the first dot matrix unit 5 and the second dot matrix unit 6 are arranged side by side and alternately in a horizontal direction and are turned upside down, and the first dot matrix unit 5 and the second dot matrix unit 6 are sequentially connected end to end and are integrally formed;

the lengths of the first longitudinal interlocking strip 13 and the second longitudinal interlocking strip 14 are the same, that is, the sum of the first dot matrix unit 5 and the second dot matrix unit 6 in the first longitudinal interlocking strip 13 is equal to the sum of the first dot matrix unit 5 and the second dot matrix unit 6 in the second longitudinal interlocking strip 14.

The sum of the first transverse interlocking strips 1 and the second transverse interlocking strips 2 is equal to the total sum of the second dot matrix units 6 and the first dot matrix units 5 in the first longitudinal interlocking strips 13; the sum of the first longitudinal interlocking strips 13 and the second longitudinal interlocking strips 14 is equal to the total sum of the second dot matrix units 6 and the first dot matrix units 5 in the first transverse interlocking strips 1.

As shown in fig. 5, the first dot matrix unit 5 includes a second X-shaped member 4 and a first X-shaped member 3 which are arranged oppositely up and down, and the end portions of the four support legs of the second X-shaped member 4 and the first X-shaped member 3 are respectively provided with a connecting body 8, and the two support legs at the lower end of the second X-shaped member 4 and the two support legs at the upper end of the first X-shaped member 3 are respectively connected through the connecting bodies 8 and are integrally formed;

as shown in fig. 6, the second dot matrix unit 6 includes a third X-shaped member 7 and a second X-shaped member 4 which are disposed opposite to each other, and connectors 8 are respectively disposed at the ends of four support legs of the third X-shaped member 7 and the second X-shaped member 4, and two support legs at the lower end of the third X-shaped member 7 and two support legs at the upper end of the second X-shaped member 4 are respectively connected by the connectors 8 and integrally formed;

the connectors 8 of the two support legs at the top end between the adjacent first dot matrix unit 5 and the second dot matrix unit 6 are connected and integrally formed to form an upper boss 9, the connectors 8 of the four support legs at the middle are connected and integrally formed to form a connecting node 11, and the connectors 8 of the two support legs at the bottom end are connected and integrally formed to form a lower boss 10; in the spark cutting, in order to ensure continuous cutting and improve cutting efficiency, grooves are formed at the upper boss 9 and the lower boss 10, respectively, and the width of the grooves is 0.05 mm.

The length and the width of the four support legs of the first X-shaped part 3, the second X-shaped part 4 and the third X-shaped part 7 are the same; the included angle between two corresponding adjacent support legs is the same;

as shown in fig. 5 and 6, a half notch 4-1 is arranged above the intersection point of the second X-shaped part 4; a second whole notch 7-1 is formed at the intersection point of the third X-shaped part 7, and the second whole notch 7-1 enables two left support legs and two right support legs at the intersection point of the third X-shaped part 7 to be separated; during electric spark cutting, in order to ensure the cutting continuity, a first whole notch 3-1 is formed at the intersection point of the first X piece 3, the width of the notch is 0.05mm, and the first whole notch 3-1 enables two left support legs and two right support legs at the intersection point of the first X piece 3 to be separated;

the groove width of the second whole notch 7-1 is larger than that of the first whole notch 3-1; the groove width of the second whole notch 7-1, the groove width of the half notch 4-1, the thickness of the transverse interlocking strip 1 and the thickness of the longitudinal interlocking strip 2 are the same, and the value range of the thicknesses of the transverse interlocking strip 1 and the longitudinal interlocking strip 2 is 0.1-10 mm;

a gap of 0.05mm can be reserved in the width and depth directions of the half notch 4-1 and the second full notch 7-1 on the original basis, namely the width of the second full notch 7-1 and the width of the half notch 4-1 are larger than the thickness of the interlocking strip by 0.05mm, and solder is added conveniently during interlocking assembly and later-stage welding.

As shown in fig. 7 to 11, in the process of forming the dot matrix core material by fastening the transverse group interlocking strips and the longitudinal group interlocking strips, the half notches 4-1 of the first dot matrix unit 5 in the transverse group interlocking strips pass through the second whole notch 7-1 of the opposite second dot matrix unit 6 in the longitudinal group interlocking strips, and the first dot matrix unit 5 in the transverse group interlocking strips and the opposite second dot matrix unit 6 in the longitudinal group interlocking strips are connected by fastening the two half notches 4-1 and fastening the second whole notch 7-1 with the first whole notch 3-1 opened by the first X piece 3 or with the intersection point of the first X piece 3 (at this time, the intersection point of the first X piece 3 is not opened); the half notch 4-1 of the first dot matrix unit 5 in the longitudinal group of the interlocking strips penetrates through the second whole notch 7-1 of the corresponding second dot matrix unit 6 in the transverse group of the interlocking strips, and the first dot matrix unit 5 in the longitudinal group of the interlocking strips and the corresponding second dot matrix unit 6 in the transverse group of the interlocking strips are connected through the clamping of the two half notches 4-1 and the embedding of the second whole notch 7-1 and the first whole notch 3-1 of the first X piece 3 or the intersection of the first X piece 3 (at the moment, the intersection of the first X piece 3 is not provided with an opening).

Example 1: a method of making a novel lattice core structure using a cut interlocking, said method comprising the steps of:

the method comprises the following steps: cutting the interlocking strip: cutting a plurality of superposed plates into a plurality of same interlocking strips by using a wire-cut electric discharge machine, wherein the thickness of the superposed plates is about 20mm, the cutting speed of the wire-cut electric discharge machine is 3.5 mm/min, and the cutting accuracy is ensured by properly adjusting the tightness of cutting wires during electric discharge cutting; the interlocking strips are formed by horizontally arranging the first dot matrix units 5 and the second dot matrix units 6 in an alternating manner side by side and sequentially connecting the heads and the tails of the first dot matrix units and the second dot matrix units;

step two: cutting the embedded locking bar: the interlocking bar is divided into a plurality of first transverse interlocking bars 1, a plurality of second transverse interlocking bars 2, a plurality of first longitudinal interlocking bars 13 and a plurality of second longitudinal interlocking bars 14 by using an electric spark cutting machine;

step three: assembling a dot matrix core: sequentially and alternately arranging the first transverse interlocking strips 1 and the second transverse interlocking strips 2 in parallel at equal intervals to form transverse combined interlocking strips; sequentially arranging the first longitudinal interlocking strips 13 and the second longitudinal interlocking strips 14 alternately in parallel at equal intervals to form longitudinal group interlocking strips; the transverse group embedded locking strips and the longitudinal group embedded locking strips are arranged vertically; the half notches 4-1 of the first dot matrix units 5 in the transverse group of the interlocking strips penetrate through the second whole notches 7-1 of the opposite second dot matrix units 6 in the longitudinal group of the interlocking strips, and the first dot matrix units 5 in the transverse group of the interlocking strips are connected with the opposite second dot matrix units 6 in the longitudinal group of the interlocking strips through the clamping of the two half notches 4-1 and the embedding of the second whole notches 7-1 and the first whole notches 3-1; the half notch 4-1 of the first dot matrix unit 5 in the longitudinal group of the interlocking strips penetrates through the second whole notch 7-1 of the corresponding second dot matrix unit 6 in the transverse group of the interlocking strips, and the first dot matrix unit 5 in the longitudinal group of the interlocking strips and the corresponding second dot matrix unit 6 in the transverse group of the interlocking strips are connected through the clamping of the two half notches 4-1 and the embedding of the second whole notch 7-1 and the first whole notch 3-1.

When an electric spark cutting machine is used for cutting, in order to ensure the cutting continuity and reduce the cutting time, a first whole notch 3-1 is formed at the intersection of a first X piece 3 of a first lattice unit 5 in a first transverse interlocking strip 1, a second transverse interlocking strip 2, a first longitudinal interlocking strip 13 and a second longitudinal interlocking strip 14, and third whole notches are formed at an upper boss 9 and a lower boss 10 respectively; because the first full notch 3-1 of the first lattice unit 5 is completely cut off, the second full notch 7-1 of the second lattice unit 6 is completely cut off, the engaging position of the first full notch 3-1 and the second full notch 7-1 is weaker than the engaging position of the two half notches 4-1, therefore, the first lattice unit 5 and the second lattice unit 6 are arranged in an alternating mode, the phenomenon that the embedded part of the first complete notch 3-1 and the second complete notch 7-1 is simultaneously arranged on the upper side or the lower side of the lattice core material can be avoided, the lattice structure is prevented from being prematurely damaged on the upper portion or the lower portion, the embedded part of the first complete notch 3-1 and the second complete notch 7-1 and the clamping of the two half notches 4-1 are respectively and alternately arranged on the upper side and the lower side of the lattice structure, and the bearing capacities of the upper portion and the lower portion of the integral lattice structure are enabled to be not different greatly (as shown in fig. 7 and 8).

Example 2: a method for preparing a novel lattice core structure by adopting a cutting and interlocking method comprises the following steps:

cutting the interlocking bar: cutting the plate into interlocking strips by using a laser cutting machine, wherein the interlocking strips are transversely arranged side by side alternately by a first dot matrix unit 5 and a second dot matrix unit 6 and are sequentially connected end to form an integral body;

step two: cutting the embedded locking bar: dividing the interlocking bar into a plurality of first transverse interlocking bars 1, a plurality of second transverse interlocking bars 2, a plurality of first longitudinal interlocking bars 13 and a plurality of second longitudinal interlocking bars 14 by using a laser cutting machine;

step three: assembling a dot matrix core: sequentially and alternately arranging the first transverse interlocking strips 1 and the second transverse interlocking strips 2 in parallel at equal intervals to form transverse combined interlocking strips; sequentially arranging the first longitudinal interlocking strips 13 and the second longitudinal interlocking strips 14 alternately in parallel at equal intervals to form longitudinal group interlocking strips; the transverse group embedded locking strips and the longitudinal group embedded locking strips are arranged vertically; the half notches 4-1 of the first dot matrix units 5 in the transverse group of the interlocking strips penetrate through the second whole notches 7-1 of the opposite second dot matrix units 6 in the longitudinal group of the interlocking strips, and the first dot matrix units 5 in the transverse group of the interlocking strips are connected with the opposite second dot matrix units 6 in the longitudinal group of the interlocking strips through the clamping of the two half notches 4-1 and the embedding of the second whole notches 7-1 and the first whole notches 3-1; the half notch 4-1 of the first dot matrix unit 5 in the longitudinal group of the interlocking strips penetrates through the second whole notch 7-1 of the corresponding second dot matrix unit 6 in the transverse group of the interlocking strips, and the first dot matrix unit 5 in the longitudinal group of the interlocking strips and the corresponding second dot matrix unit 6 in the transverse group of the interlocking strips are connected through the clamping of the two half notches 4-1 and the embedding of the second whole notch 7-1 and the first whole notch 3-1.

When a laser cutting machine is used for cutting, the first X-piece 3 intersection, the upper boss and the lower boss of the first lattice unit 5 in the obtained first transverse interlocking strip 1, the second transverse interlocking strip 2, the first longitudinal interlocking strip 13 and the second longitudinal interlocking strip 14 are not processed, namely, the first X-piece 3 intersection is a connected and integrally formed structure, and the upper boss and the lower boss are also connected and integrally formed structures, so that the structure has higher rigidity and stronger capability of resisting local buckling of a panel, but because the second lattice unit 6 is completely cut off at the second whole notch 7-1, the embedding part of the first X-piece 3 intersection and the second whole notch 7-1 is weaker than the clamping part of the two half notches 4-1, so that the first lattice unit 5 and the second lattice unit 6 are alternately arranged, the phenomenon that the intersection of the first X piece 3 and the embedding part of the second complete notch 7-1 are simultaneously arranged on the upper side or the lower side of the lattice core material can be avoided, so that the lattice structure is prevented from being prematurely damaged on the upper portion or the lower portion, the intersection of the first X piece 3 and the second complete notch 7-1 and the clamping of the two half notches 4-1 are alternately arranged on the upper side and the lower side of the lattice structure respectively, and the bearing capacities of the upper portion and the lower portion of the integral lattice structure are not greatly different (as shown in fig. 7 and 8).

The core material obtained by examples 1 and 2 of the present invention is designed to effectively increase the node density of the panel with a determined height of the core material, compared to the existing hourglass lattice core material (see fig. 12 to 14), wherein d₂＝1/2d₁，d₂The pitch of the node lines of the lattice core of the invention, d₁The lattice core is characterized in that the lattice core is an hourglass lattice core, the number of the nodes is 2 times that of the nodes of the hourglass lattice core, and the lattice core is connected with a panel, so that the capability of resisting local buckling of the panel of a thin panel thick core lattice structure can be effectively improved.

The lattice core material has the following main advantages that (1) compared with the existing hourglass lattice core material, the core material can improve and enhance the energy absorption performance of the structure. (2) Experiments show that under the in-plane compressive load, when the plate is partially bent and fails, the in-plane compressive maximum load of the lattice structure is obviously higher than that of the existing hourglass lattice structure; (3) when the spark wire cutting machine is used for cutting, the preparation method for cutting the openings of the upper lug boss, the lower lug boss and the like ensures the cutting continuity, can improve the preparation efficiency and reduce the preparation cost.