CN114055080A - Processing method based on gradient multi-cell lattice structure - Google Patents
Processing method based on gradient multi-cell lattice structure Download PDFInfo
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- CN114055080A CN114055080A CN202111338500.2A CN202111338500A CN114055080A CN 114055080 A CN114055080 A CN 114055080A CN 202111338500 A CN202111338500 A CN 202111338500A CN 114055080 A CN114055080 A CN 114055080A
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- 238000003672 processing method Methods 0.000 title claims abstract description 10
- 210000005056 cell body Anatomy 0.000 claims abstract description 19
- 210000004027 cell Anatomy 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000009826 distribution Methods 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 9
- 238000005219 brazing Methods 0.000 claims description 4
- 210000002421 cell wall Anatomy 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 6
- 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
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 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
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000007903 penetration ability 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
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- 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 multi-cell lattice structure, which comprises the following steps: firstly, determining a cell structure in a multi-cell lattice structure and whether connecting arms exist among cell bodies, and if the connecting arms exist, determining the form of the connecting arms, and further designing a multi-cell lattice structure model with equal thickness; determining a gradient area for dividing the thickness of a cell body according to the stress distribution condition of the multi-cell lattice structure with the thickness when different loads are applied, and further designing a gradient multi-cell lattice structure model; the required types and the quantity of various types of plug-in board sheets are split according to the quantity of different gradient areas of the gradient multi-cell lattice structure model, and notches in opposite directions are respectively machined on the two plug-in board sheets for assembly; selecting materials to prepare a splicing plate sheet; assembling the splicing plates according to the gradient multi-cell lattice structure model, and fixing the splicing plates at the positions of the notches.
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 multi-cell lattice structure.
Background
When the multi-cell structure bears external load, the multi-cell structure can generate large plastic deformation due to the existence of a large number of holes, and has strong energy absorption capacity. When the deformation range is smaller, linear elastic deformation which is mainly caused by cell wall bending or cell surface stretching occurs, and with the increase of deformation, the cell collapses through a deformation mechanism corresponding to elastic bending, plastic hinge formation and even brittle fracture, but the bearing capacity is not obviously lost due to the damage of the cell, and a large strain range is maintained under a more stable stress value. When the cells are almost completely collapsed and the cell walls are in contact with each other, the mechanical behavior of the compacted material is exhibited.
According to the existing research, when the lattice structure is subjected to load, the load born by the parts of the lattice structure is not completely the same, and particularly the lattice structure is influenced by the processing technology, so that the parts firstly fail, and finally the whole lattice structure fails in various modes. Common structures are shown in fig. 1, and the common structures are all made of the same wall thickness, so that the mechanical properties of the structures are not fully exerted, and the wall thickness between the regions is changed, so that the wall thickness between the regions presents a gradient change trend. Under the axial and small-angle collision, the energy absorption capacities of the gradient structure and the uniform structure are not greatly different, but the energy absorption of the gradient structure is obviously higher than that of the uniform structure along with the increase of the collision angle, and the gradient structure has better energy absorption characteristic in the oblique collision;
but conventional processes are difficult to implement. Chinese patent CN112248956A discloses a "mixed gradient cage energy absorption structure based on multiple working conditions and its processing method", which adopts powder laser sintering to process layer by layer, but the premise of this technology is that the three-dimensional data of the object is available, and the laser beam concentration and penetration ability is small, which can be limited by the conditions of small area and thin slice product, the application range is narrow, and is not suitable for the requirement of mass production.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a processing method based on a gradient multi-cell lattice structure.
The technical scheme of the invention is as follows:
a processing method based on a gradient multi-cell lattice structure comprises the following steps:
step S1: firstly, determining a cell structure in a multi-cell lattice structure and whether connecting arms exist among cell bodies, and if the connecting arms exist, determining the form of the connecting arms, and further designing a multi-cell lattice structure model with equal thickness;
step S2: determining a gradient area for dividing the thickness of a cell body according to the stress distribution condition of the multi-cell lattice structure with the thickness when different loads are applied, and further designing a gradient multi-cell lattice structure model;
step S3: the required types and the quantity of various types of plug-in board sheets are split according to the quantity of different gradient areas of the gradient multi-cell lattice structure model, and notches in opposite directions are respectively machined on the two plug-in board sheets for assembly;
step S4: selecting materials to prepare a splicing plate sheet;
step S5: assembling the splicing plates according to the gradient multi-cell lattice structure model, and fixing the splicing plates at the positions of the notches.
Preferably, the gradient multi-cell lattice structure model is divided into N areas in the transverse direction and the longitudinal direction, the wall thickness of the cell elements in each area is the same, the wall thicknesses of the cell elements in two adjacent areas are distributed in a gradient manner, and if connecting arms are arranged, the connecting arms between the two adjacent areas are in a step shape.
Preferably, the depth of the notch is half of the width of the plug sheet.
Preferably, the width of the notch is the maximum thickness of the cell walls in the column direction area.
Preferably, the material in step S4 may be steel or a composite material.
In the present invention, when the material in step S4 is steel, brazing may be selected for the fixing process; when the material in step S4 is a composite material, the fixing treatment with a resin adhesive may be selected.
The invention has the following beneficial effects:
the invention provides a processing method based on a gradient multi-cell lattice structure, which can quickly, simply and feasibly realize the processing of the gradient multi-cell lattice structure and is beneficial to the application of the gradient multi-cell lattice structure of different base materials; the production period is short, and compared with other processing methods, the method is suitable for mass production.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a diagram of a conventional uniform-thickness multi-cell lattice structure model;
FIG. 2 is a diagram showing a structure of a cell body in the embodiment;
FIG. 3 is a cross-sectional view of a cell body in an embodiment;
FIG. 4 is a diagram showing a model of the multi-cell lattice structure in the example;
FIG. 5 is a schematic diagram of a 3X 3 gradient multi-cell lattice structure in example;
FIG. 6 is a reference structure of steel;
FIG. 7 is a partial structure view of the socket plate A in the embodiment;
FIG. 8 is a partial view of three other types of connector strips according to the exemplary embodiment;
fig. 9 is an assembly diagram of the plug sheet a and the plug sheet B in the embodiment;
fig. 10 is an assembly diagram of the plug sheet a and the plug sheet C in the embodiment;
fig. 11 is an assembly diagram of the plug sheet a and the plug sheet D in the embodiment;
FIG. 12 is a partial block diagram of FIG. 9;
FIG. 13 is a second partial block diagram of FIG. 9;
FIG. 14 is an isometric view of a 3X 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
In order to make the technical solutions and advantages thereof better understood by those skilled in the art, the present application is described in detail below with reference to the accompanying drawings, but the present application is not limited to the scope of the present invention.
Example (b):
referring to the energy absorbing structure of CN112248956A, it was determined that the cell structure of the multi-cell lattice structure of the present embodiment is shown in fig. 2, the cross-sectional view of the cell structure is shown in fig. 3, and the cross-sectional geometry of the cell structure is shown in table 1 below;
TABLE 1
The front view of the uniform-thickness multi-cell lattice structure model is shown in fig. 4, and is divided into three layers in the Z direction, each layer comprises three regions, and is divided into nine regions in total, and the gradient division condition is as follows: taking the upper left cell body of the Z-direction forming surface and the X-direction forming surface as a starting point, changing along the X-direction negative gradient, changing along the Z-direction positive gradient, and obtaining a gradient multi-cell lattice structure model, wherein the thickness difference of the cell body is equal between areas;
in this embodiment, four kinds of the plug sheet A, B, C, D are required (if there are N regions in the transverse direction and the longitudinal direction, N +1 kinds of the plug sheet are required), wherein the plug sheet a has nine different gradient regions, and the other three kinds of the plug sheet have three different gradient regions;
processing by taking a 3 x 3 gradient multi-cell lattice structure model (see fig. 5) as an example, selecting a steel plate as a preparation material, and preparing a splicing plate sheet in a linear cutting machining mode (if a composite material is selected, adopting an engraving machine, and matching a special engraving tool bit for the composite material on the engraving machine);
when cutting is carried out, the joint of the bottom surface of the top layer cell body and the top surface of the middle layer cell body is designed to take the thickness of the top surface of the middle layer cell body as the connecting thickness; similarly, the joint between the bottom surface of the middle layer cell body and the top surface of the bottom layer cell body is designed to use the thickness of the top surface of the bottom layer cell body as the connection thickness (see fig. 12); the central lines of the two connecting arms with different wall thicknesses are a horizontal line in the transverse direction; in the longitudinal direction, the bottoms of the connecting arms of two different wall thicknesses lie in the same plane (see fig. 13).
Referring to FIG. 6: determining geometric parameters for designing by taking the face formed by the Z direction and the X direction in the figure 5 to face upwards, selecting proper quantity of steel plates with consistent cutting specifications or welding the steel plates as a group according to types to be clamped on a perforating machine for perforating, so that regular hexagonal holes are alternately distributed on the steel plates in rows, processing notches penetrating through the regular hexagons from the middle position of the upper ends of the long rows of the regular hexagons, wherein the depth of each notch is half of the width of each splicing plate piece, the width of each notch of the splicing plate piece A is in a descending trend from left to right (shown in figure 7), then fixing the steel plate group on a wire cutting machine, drawing by using drawing software, and guiding a drawing result into a wire cutting controller for cutting;
the method comprises the steps of determining geometric parameters to design by facing upwards in the Z direction and the Y direction in fig. 5, selecting proper number of steel plates with consistent cutting specifications or welding the steel plates as a group according to types to clamp the steel plates on a perforating machine for perforating, so that regular hexagonal holes are alternately distributed on the steel plates in rows, and the wall thickness of an inserting plate B, C, D is increased from top to bottom in the Z direction, wherein a notch penetrating through the regular hexagon is formed in the middle position of the lower end of a long row of regular hexagons, the depth of the notch is half of the width of the inserting plate (see fig. 8), and the width of the notch is the same as the maximum wall thickness in the corresponding area of the inserting plate A, so that the notch can be cut with the notch of the inserting plate A;
the plug sheet B, C, D corresponds to three large areas of the plug sheet a in the row direction (if the a plates have N large areas in the row direction, N plates are needed to correspond to the large areas), and the sizes of the single cell bodies in the plug sheet a are different except for the width of the notch, and the sizes of the cell bodies correspond to the sizes of the cell bodies in the areas of the plug sheet a in the row direction;
because the molybdenum wire of the wire cutting machine generates heat in the cutting process, the molybdenum wire needs to be cooled by working fluid, so that oil stains are left on the surface of the splicing plate after the cutting is finished, and the machined splicing plate needs to be cleaned to remove the oil stains;
referring to FIGS. 9-11: the connection of the notches between the plug-in plates is realized by adopting a brazing process (the notches of the composite material plates are bonded by adopting liquid resin adhesive): firstly, smearing brazing filler metal to the notch of the plug board piece a (namely, including nine areas), after even smearing, respectively assembling the plug board piece B, C, D and the plug board piece a at corresponding positions (note that the direction of the notch is opposite during assembly), and finishing the assembly as shown in fig. 14-16;
then, selecting proper temperature for heat preservation treatment in a high-temperature high-pressure gas quenching furnace according to requirements; and finally, cooling along with the furnace to obtain the gradient multi-cell lattice structure (after the composite material plate is assembled and put into an insulation can, adjusting the temperature, preserving the heat, and naturally cooling to obtain the composite material gradient multi-cell lattice structure).
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. A processing method based on a gradient multi-cell lattice structure is characterized by comprising the following steps:
step S1: firstly, determining a cell structure in a multi-cell lattice structure and whether connecting arms exist among cell bodies, and if the connecting arms exist, determining the form of the connecting arms, and further designing a multi-cell lattice structure model with equal thickness;
step S2: determining a gradient area for dividing the thickness of a cell body according to the stress distribution condition of the multi-cell lattice structure with the thickness when different loads are applied, and further designing a gradient multi-cell lattice structure model;
step S3: the required types and the quantity of various types of plug-in board sheets are split according to the quantity of different gradient areas of the gradient multi-cell lattice structure model, and notches in opposite directions are respectively machined on the two plug-in board sheets for assembly;
step S4: selecting materials to prepare a splicing plate sheet;
step S5: assembling the splicing plates according to the gradient multi-cell lattice structure model, and fixing the splicing plates at the positions of the notches.
2. The method for processing a gradient multi-cell lattice structure according to claim 1, wherein: the gradient multi-cell lattice structure model is divided into N areas in the transverse direction and the longitudinal direction, the wall thickness of the cell element in each area is the same, the wall thicknesses of the cell elements in two adjacent areas are distributed in a gradient manner, and if connecting arms are arranged, the connecting arms between the two adjacent areas are in a step shape.
3. The method for processing a gradient multi-cell lattice structure according to claim 1, wherein: the depth of the notch is half of the width of the plug board.
4. The method for processing a gradient multi-cell lattice structure according to claim 1, wherein: the width of the notch is the maximum thickness of the cell wall in the column direction area.
5. The method for processing a gradient multi-cell lattice structure according to claim 1, wherein: the material in step S4 may be steel or a composite material.
6. The method for processing a gradient multi-cell lattice structure according to claim 5, wherein: when the material in step S4 is steel, brazing may be selected for the fixing process; when the material in step S4 is a composite material, the fixing treatment with a resin adhesive may be selected.
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| CN202111338500.2A CN114055080B (en) | 2021-11-12 | 2021-11-12 | Processing method based on gradient multicellular lattice structure |
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| CN202111338500.2A CN114055080B (en) | 2021-11-12 | 2021-11-12 | Processing method based on gradient multicellular lattice structure |
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| CN114055080B CN114055080B (en) | 2024-06-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5016337A (en) * | 1990-02-26 | 1991-05-21 | Kimie Ejima | Production method for net structures |
| US5144830A (en) * | 1987-06-15 | 1992-09-08 | Terni Acciai Speciali S.P.A. | Method for production of nodes for tubular truss structures |
| US20170184108A1 (en) * | 2015-12-23 | 2017-06-29 | Emerson Climate Technologies, Inc. | Thermal and sound optimized lattice-cored additive manufactured compressor components |
| CN106960096A (en) * | 2017-03-24 | 2017-07-18 | 哈尔滨工业大学 | Three-dimensional negative stiffness honeycomb and preparation method thereof |
| 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 |
| 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 |
| CN111396486A (en) * | 2020-03-19 | 2020-07-10 | 哈尔滨工程大学 | Three-dimensional double-arrow negative Poisson ratio structure and interlocking assembly process thereof |
| CN112356523A (en) * | 2020-08-29 | 2021-02-12 | 南京航空航天大学 | Gradient lattice energy absorption structure, chiral cell with programmable rigidity and 3D printing method |
-
2021
- 2021-11-12 CN CN202111338500.2A patent/CN114055080B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5144830A (en) * | 1987-06-15 | 1992-09-08 | Terni Acciai Speciali S.P.A. | Method for production of nodes for tubular truss structures |
| US5016337A (en) * | 1990-02-26 | 1991-05-21 | Kimie Ejima | Production method for net structures |
| US20170184108A1 (en) * | 2015-12-23 | 2017-06-29 | Emerson Climate Technologies, Inc. | Thermal and sound optimized lattice-cored additive manufactured compressor components |
| CN106960096A (en) * | 2017-03-24 | 2017-07-18 | 哈尔滨工业大学 | Three-dimensional negative stiffness honeycomb and preparation method thereof |
| 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 |
| 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 |
| CN111396486A (en) * | 2020-03-19 | 2020-07-10 | 哈尔滨工程大学 | Three-dimensional double-arrow negative Poisson ratio structure and interlocking assembly process thereof |
| CN112356523A (en) * | 2020-08-29 | 2021-02-12 | 南京航空航天大学 | Gradient lattice energy absorption structure, chiral cell with programmable rigidity and 3D printing method |
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