CN114055080B - Processing method based on gradient multicellular lattice structure - Google Patents
Processing method based on gradient multicellular lattice structure Download PDFInfo
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- CN114055080B CN114055080B CN202111338500.2A CN202111338500A CN114055080B CN 114055080 B CN114055080 B CN 114055080B CN 202111338500 A CN202111338500 A CN 202111338500A CN 114055080 B CN114055080 B CN 114055080B
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- 238000003672 processing method Methods 0.000 title claims abstract description 14
- 210000005056 cell body Anatomy 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000009826 distribution Methods 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 9
- 238000005219 brazing Methods 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 210000004027 cell Anatomy 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 210000002421 cell wall Anatomy 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/50—Other automobile vehicle parts, i.e. manufactured in assembly lines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention provides a processing method based on a gradient multicellular lattice structure, which comprises the following steps: firstly, determining a cell body structure in a multicell lattice structure and whether connecting arms exist between cell bodies, if so, determining the form of the connecting arms, and further designing an equal-thickness multicell lattice structure model; determining gradient areas of the thickness of the cell body to be divided according to stress distribution conditions of the multi-cell lattice structures with the thickness when the multi-cell lattice structures are subjected to different loads, and further designing a gradient multi-cell lattice structure model; according to the number of different gradient areas of the gradient multicell lattice structure model, the needed plugging sheet types and the number of the various types are split, and slots in opposite directions are respectively processed on the two plugging sheets for assembly; selecting a material to prepare a splicing sheet; assembling the splicing plates according to the gradient multicell lattice structure model, and fixing the splicing plates at the notch positions.
Description
Technical Field
The invention belongs to the field of energy absorption structures for automobiles, and particularly relates to a processing method based on a gradient multicellular lattice structure.
Background
When the multicellular structure bears external load, the multicellular structure can generate great plastic deformation due to the existence of a large number of holes, and the multicellular structure has stronger energy absorption capacity. When the deformation range is smaller, the elastic deformation of the line mainly comprising bending of the cell wall or stretching of the cell surface occurs, and with the increase of the deformation, the cell collapses by a deformation mechanism corresponding to elastic bending, plastic hinge formation and even brittle fracture, but the bearing capacity is not remarkably lost due to the damage of the cell, and instead, a large strain range is maintained under a relatively stable stress value. When the cells are almost completely crushed and the walls are in contact with each other, the mechanical behavior of the compacted material is exhibited.
According to the prior studies, when the lattice structure is loaded, the loads born by the parts are not identical, especially the parts are influenced by the processing technology, so that the parts fail first, and finally, the whole is failed in various modes. Common structures are shown in fig. 1, and the structures are all made of equal wall thickness, so that the mechanical properties of the structures are not fully exerted, the wall thickness between the regions is changed, the wall thickness between the regions shows a gradient change trend, and the design form of the multifunctional gradient can utilize the design characteristics of one aspect or several aspects of the material to achieve the properties which are not possessed by the uniform material. Under the collision of axial direction and small angle, the energy absorption capacity of the gradient structure and the energy absorption capacity of the uniform structure are not great, but along with the increase of the collision angle, the energy absorption of the gradient structure is obviously higher than the energy absorption of the uniform structure, and the gradient structure has better energy absorption characteristic during oblique collision;
But conventional processes are difficult to implement. Chinese patent CN112248956a discloses a "hybrid gradient cage energy absorbing structure based on multiple working conditions and a processing method thereof", which adopts a powder laser sintering mode to process layer by layer, but the premise of the technology is that the three-dimensional data of the object is available, and the laser beam concentration and penetration capability are small, which can be limited by conditions of small area and sheet products, and the application range is narrow, which is not suitable for the requirement of mass production.
Disclosure of Invention
In order to solve the problems in the background technology, the invention provides a processing method based on a gradient multicellular lattice structure.
The technical scheme of the invention is as follows:
A processing method based on a gradient multicellular lattice structure comprises the following steps:
Step S1: firstly, determining a cell body structure in a multicell lattice structure and whether connecting arms exist between cell bodies, if so, determining the form of the connecting arms, and further designing an equal-thickness multicell lattice structure model;
Step S2: determining gradient areas of the thickness of the cell body to be divided according to stress distribution conditions of the multi-cell lattice structures with the thickness when the multi-cell lattice structures are subjected to different loads, and further designing a gradient multi-cell lattice structure model;
step S3: according to the number of different gradient areas of the gradient multicell lattice structure model, the needed plugging sheet types and the number of the various types are split, and slots in opposite directions are respectively processed on the two plugging sheets for assembly;
Step S4: selecting a material to prepare a splicing sheet;
step S5: assembling the splicing plates according to the gradient multicell lattice structure model, and fixing the splicing plates at the notch positions.
As the preferable mode of the invention, the gradient multicell lattice structure model is divided into N areas in the transverse direction and the longitudinal direction, the cell body wall thickness in each area is the same, the cell body wall thicknesses in two adjacent areas are distributed in a gradient way, and if connecting arms are arranged, the connecting arms between the two adjacent areas are in a ladder shape.
Preferably, the depth of the notch is half the width of the plugging sheet.
Preferably, the width of the notch is the maximum value of the cell wall thickness of the column area.
Preferably, the material in the step S4 may be steel or a composite material.
As a preferable aspect of the present invention, when the material in step S4 is steel, brazing may be selected for the fixing treatment; when the material in step S4 is a composite material, the fixing treatment may be optionally performed with a resin paste.
The beneficial effects of the invention are as follows:
the invention provides a processing method based on a gradient multicellular lattice structure, which can rapidly, simply and practically process the gradient multicellular lattice structure and is beneficial to the application of the gradient multicellular lattice structure of different matrix materials; the production period is short, and compared with other processing methods, the method is suitable for mass production.
Drawings
Other objects and attainments together with a more complete understanding of the invention will become apparent and appreciated by referring to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a diagram of a conventional equal thickness multicellular lattice structure;
FIG. 2 is a diagram of a cell structure in an embodiment;
FIG. 3 is a cross-sectional view of a cell body according to an embodiment;
FIG. 4 is a diagram of a multi-cell lattice structure model in an embodiment;
FIG. 5 is a3×3 gradient multicellular lattice structure model in an embodiment;
FIG. 6 is a reference structure of steel;
FIG. 7 is a partial block diagram of the patch panel A in the embodiment;
FIG. 8 is a partial block diagram of another three patch panels in an embodiment;
FIG. 9 is a schematic diagram illustrating the assembly of the plugging sheet A and the plugging sheet B according to the embodiment;
fig. 10 is an assembled schematic view of a socket board a and a socket board C according to the embodiment;
FIG. 11 is a schematic diagram illustrating the assembly of the plugging sheet A and the plugging sheet D according to the embodiment;
FIG. 12 is a partial block diagram I of FIG. 9;
FIG. 13 is a second partial block diagram of FIG. 9;
FIG. 14 is an isometric view of a 3×3 gradient multicellular lattice structure in an example;
Fig. 15 is a front view of fig. 14;
Fig. 16 is a top view of fig. 14.
Detailed Description
The following detailed description of the application, taken in conjunction with the accompanying drawings, is not intended to limit the scope of the application, so that those skilled in the art may better understand the technical solutions of the application and their advantages.
Examples:
Referring to the energy absorption structure in chinese patent CN112248956a, it is determined that the cell body structure in the multicell lattice structure of this embodiment is shown in fig. 2, the cross-sectional view of the cell body structure is shown in fig. 3, and the cross-sectional geometry of the cell body structure is shown in table 1 below;
TABLE 1
As shown in FIG. 4, the front view of the equal-thickness multicellular lattice structure model is divided into three layers in the Z direction, each layer comprises three areas, the total area is divided into nine areas, and the gradient division condition is as follows: taking a cell body at the upper left corner of a Z-direction forming surface and an X-direction forming surface as a starting point, carrying out negative gradient change along the X-direction, carrying out positive gradient change along the Z-direction, and obtaining a gradient multicell lattice structure model, wherein the cell thickness difference between the areas is equal;
in this embodiment, four plugging sheets A, B, C, D (n+1 plugging sheets are required if there are N regions in the transverse direction and N regions in the longitudinal direction respectively) are required, where nine different gradient regions are provided on the plugging sheet a, and three different gradient regions are provided on the other three plugging sheets;
Taking 3×3 gradient multicellular lattice structure model (see fig. 5) as an example for processing, selecting steel plate as preparation material, and preparing splicing plate by linear cutting machining (engraving machine for composite material, with special engraving bit);
When cutting is carried out, the junction between the bottom surface of the top cell body and the top surface of the middle cell body is designed to take the thickness of the top surface of the middle cell body as the connection thickness; the junction between the bottom surface of the cell body of the middle layer and the top surface of the cell body of the bottom layer is designed to take the thickness of the top surface of the cell body of the bottom layer as the connection thickness (see figure 12); the central lines of the two connecting arms with different wall thicknesses are horizontal lines in the transverse direction; in the longitudinal direction, the bottoms of the two connecting arms with different wall thicknesses are located on the same plane (see fig. 13).
See fig. 6: the method comprises the steps of designing by determining geometric parameters from the surface formed by the Z direction and the X direction in the figure 5, selecting proper number or a group of steel plates with consistent cutting specifications as a group, welding and clamping the steel plates together to punch holes on a puncher, alternately distributing regular hexagon holes on the steel plates in rows, processing notches penetrating through the regular hexagons from the middle position of the upper end of the long row of regular hexagons, wherein the depth of each notch is half of the width of a plugging sheet, gradually reducing the width of each notch of a plugging sheet A from left to right (see figure 7), fixing the steel plate group on a linear cutting machine, drawing by using drawing software, and guiding drawing results into a linear cutting controller to cut;
The method comprises the steps of designing the surface formed by the Z direction and the Y direction in the figure 5 in an upward manner, determining geometric parameters, selecting proper number or welding together a group of steel plates with consistent cutting specifications according to the types, clamping the steel plates on a perforating machine for perforation, alternately distributing regular hexagonal holes on the steel plates in rows, and enabling the wall thickness of a plugging sheet B, C, D to increase from top to bottom in the Z direction, wherein a notch penetrating through the regular hexagon is processed at the middle position of the lower end of the long row of regular hexagons, the depth of the notch is half of the width of the plugging sheet (see figure 8), and the width of the notch is the same as the maximum wall thickness in the corresponding area of the plugging sheet A so as to ensure that the plugging sheet A can be matched with the notch of the plugging sheet A in the upward direction;
The plugging sheet B, C, D corresponds to three large areas in the upward direction of the plugging sheet a (if the a plate has N large areas in the upward direction, N plates are needed to be corresponding to the large areas), the sizes of single cell bodies in the large areas are different except for the widths of the open slots, and the sizes of the single cell bodies in the large areas correspond to the sizes of the cell bodies in the areas in the upward direction of the plugging sheet a;
The wire cutting machine molybdenum wire generates heat in the cutting process, so that the wire cutting machine molybdenum wire needs to be cooled by working fluid, oil stains can be left on the surface of the spliced plate after the cutting is finished, and the processed spliced plate needs to be cleaned to remove the oil stains;
See fig. 9-11: the brazing process (the liquid resin glue is adopted to bond the notches of the composite material plates) is adopted to realize the connection of the notches of the splicing plates: firstly, the brazing filler metal is smeared at the notch of the plugging sheet A (namely, nine areas are included), after the brazing filler metal is smeared uniformly, the plugging sheet B, C, D and the plugging sheet A are assembled at the corresponding positions respectively (the notch direction is opposite during the assembly), and the assembled view is shown in figures 14-16;
then, in a high-temperature high-pressure gas quenching furnace, selecting proper temperature according to the requirement to perform heat preservation treatment; and finally, cooling along with the furnace to obtain a gradient multicellular lattice structure (after the composite material sheet is assembled, the composite material sheet is put into an insulation box, the temperature is regulated, the insulation is carried out, and natural cooling is carried out, so that the composite material gradient multicellular lattice structure can be prepared).
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. The processing method based on the gradient multicellular lattice structure is characterized by comprising the following steps of:
Step S1: firstly, determining a cell body structure in a multicell lattice structure and whether connecting arms exist between cell bodies, if so, determining the form of the connecting arms, and further designing an equal-thickness multicell lattice structure model;
step S2: determining gradient areas needing to divide cell body thickness according to stress distribution conditions of the equal-thickness multi-cell lattice structure when the equal-thickness multi-cell lattice structure is subjected to different loads, further designing a gradient multi-cell lattice structure model, wherein the gradient multi-cell lattice structure model is divided into N areas in the transverse direction and the longitudinal direction, the cell body wall thickness in each area is the same, the cell body wall thicknesses in two adjacent areas are distributed in a gradient manner, and if connecting arms exist, the connecting arms between the two adjacent areas are in a ladder shape;
Step S3: according to the number of different gradient areas of the gradient multicell lattice structure model, the needed plugging sheet types and the number of various types are split, slots in opposite directions are respectively processed on two plugging sheets for assembly, the depth of each slot is half of the width of each plugging sheet, and the width of each slot is the maximum value of the wall thickness of a cell body in the area where the slot is located;
Step S4: selecting a material to prepare a plugging sheet, and designing a joint between the bottom surface of the top layer cell body and the top surface of the middle layer cell body to take the thickness of the top surface of the middle layer cell body as a connection thickness when cutting; the junction between the bottom surface of the middle layer cell body and the top surface of the bottom layer cell body is designed to take the thickness of the top surface of the bottom layer cell body as the connection thickness; the central lines of the two connecting arms with different wall thicknesses are horizontal lines in the transverse direction; in the longitudinal direction, the bottoms of the two connecting arms with different wall thicknesses are positioned on the same plane;
step S5: assembling the splicing plates according to the gradient multicell lattice structure model, and fixing the splicing plates at the notch positions.
2. The processing method based on the gradient multicellular lattice structure of claim 1, wherein the processing method is characterized by: the material in the step S4 is steel or a composite material.
3. The processing method based on the gradient multicellular lattice structure of claim 2, wherein the processing method is characterized by: when the material in the step S4 is steel, selecting brazing for fixing treatment; when the material in step S4 is a composite material, fixing treatment is performed by using a resin adhesive.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960096A (en) * | 2017-03-24 | 2017-07-18 | 哈尔滨工业大学 | Three-dimensional negative stiffness honeycomb and preparation method thereof |
| CN110929358A (en) * | 2020-01-21 | 2020-03-27 | 中国人民解放军国防科技大学 | Design method and material of parameterized functional gradient cubic lattice structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| IT1206037B (en) * | 1987-06-15 | 1989-04-05 | Terni Ind Elettr | METHOD FOR THE PRODUCTION OF TUBULAR STRUCTURE NODES |
| US5016337A (en) * | 1990-02-26 | 1991-05-21 | Kimie Ejima | Production method for net structures |
| US10634143B2 (en) * | 2015-12-23 | 2020-04-28 | Emerson Climate Technologies, Inc. | Thermal and sound optimized lattice-cored additive manufactured compressor components |
| CN107199439A (en) * | 2017-05-18 | 2017-09-26 | 西安交通大学 | A kind of square honeycomb sandwich construction and preparation method thereof |
| CN111396486B (en) * | 2020-03-19 | 2021-09-24 | 哈尔滨工程大学 | Three-dimensional double-arrow negative Poisson ratio structure and interlocking assembly process thereof |
| CN112356523B (en) * | 2020-08-29 | 2021-12-07 | 南京航空航天大学 | Gradient lattice energy absorption structure constructed by chiral cell based on programmable rigidity and 3D printing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960096A (en) * | 2017-03-24 | 2017-07-18 | 哈尔滨工业大学 | Three-dimensional negative stiffness honeycomb and preparation method thereof |
| CN110929358A (en) * | 2020-01-21 | 2020-03-27 | 中国人民解放军国防科技大学 | Design method and material of parameterized functional gradient cubic lattice structure |
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