CN107742014A - The design method of phase-change energy storage device dot matrix sandwich based on increasing material manufacturing - Google Patents

The design method of phase-change energy storage device dot matrix sandwich based on increasing material manufacturing Download PDF

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CN107742014A
CN107742014A CN201710908775.2A CN201710908775A CN107742014A CN 107742014 A CN107742014 A CN 107742014A CN 201710908775 A CN201710908775 A CN 201710908775A CN 107742014 A CN107742014 A CN 107742014A
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dot matrix
cell element
housing
fine
sparse
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CN107742014B (en
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张啸雨
郭霖
周浩
苗建印
向艳超
邓宇华
成志忠
陈燕
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Beijing Institute of Spacecraft System Engineering
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Beijing Institute of Spacecraft System Engineering
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/15—Vehicle, aircraft or watercraft design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/06—Power analysis or power optimisation

Abstract

The present invention relates to a kind of design method of the phase-change energy storage device dot matrix sandwich based on increasing material manufacturing, belong to spacecraft lightweight multifunction structure technical field.The method of the invention considers increasing material manufacturing process constraint, by the means of grand microcosmic combination, can quickly design the integral structure for meeting increasing material manufacturing requirement.Designed phase-change energy storage device inside configuration is three-dimensional net structure, realizes that light-weight design connects with inside, compared with traditional structure loss of weight more than 60%；Filling is coordinated using the sparse dot matrix cell element of specific structure and fine and close dot matrix cell element, it is seamless spliced between two kinds of cell elements to realize to avoid the occurrence of cantilever rod member, and avoids caving in for top structure；In addition, strength problem caused by welding is not present in the phase-change energy storage device structure of the design, had a good application prospect in spacecraft lightweight multifunction structure design field.

Description

The design method of phase-change energy storage device dot matrix sandwich based on increasing material manufacturing
Technical field
The present invention relates to a kind of design method of the phase-change energy storage device dot matrix sandwich based on increasing material manufacturing, belong to boat Its device lightweight multifunction structure technical field.
Background technology
The precision equipment species such as camera, antenna is more on spacecraft, and the temperature environment requirement of normal work is more harsh, phase transformation The main function of energy storage device is to carry out temperature control to payload equipment, utilizes the phase transformation material of filling inside apparatus structure Material, heat is absorbed or discharged by phase transformation to realize the relative thermostatic control to equipment.
Traditional phase-change energy storage device structure is manufactured using machining, the shortcomings that weight weight is present, is seriously govern depth The payload function of the field spacecrafts such as sky detection and performance boost, and need to realize that structure connects by way of welding Connect, intensity or fatigue problem, and the hidden danger of thermal control refrigerant leakage in welding position often be present.
The content of the invention
In order to make up the deficiency of traditional phase-change energy storage device structure, it is an object of the invention to provide one kind based on increasing material system The design method for the phase-change energy storage device dot matrix sandwich made, this method considers increasing material manufacturing process constraint, by grand micro- The means combined are seen, can quickly design the integral structure for meeting increasing material manufacturing requirement, designed phase-change energy storage device knot The more traditional phase-change energy storage device structure of structure quality significantly mitigates, and in the absence of strength problem caused by welding, it is light in spacecraft Quantify multifunction structure design field to have a good application prospect.
The purpose of the present invention is achieved through the following technical solutions.
A kind of design method of the phase-change energy storage device dot matrix sandwich based on increasing material manufacturing, the dot matrix sandwich It is the integral structure being prepared using increasing material manufacturing technique, outside is housing, and inside is three-dimensional net structure；
The housing is a rectangular parallelepiped structure, realizes and is sealed outside the dot matrix sandwich；Work is machined with housing Skill hole and fill hole, and the inner mold face seamed edge to housing and outer mold surface seamed edge, fabrication hole and fill hole respectively and carry out chamfering, come Reduce the stress concentration at structural key position, avoid producing Strength Failure；
The three-dimensional net structure is in spatial translation by two kinds of repeat units of sparse dot matrix cell element and fine and close dot matrix cell element Arrangement form；Wherein, sparse dot matrix cell element and fine and close dot matrix cell element be by cylindrical rod piece form to rectangular pyramid structure.
The design method step is as follows：
(1) increasing material manufacturing process constraint is analyzed
According to the requirement of the spacecraft phase-change energy storage device physical dimension of routine, the increasing material manufacturing technique of use is specially laser Selective melting forming technique；The technology compares other increases material manufacturing technologies, is more suitable for the labyrinth shaping of hundred mm-scales, Formed precision is higher；
The main technique constraint that selective laser is melted and molded technology includes two aspects：First, the cylindrical bar of stable molding The minimum diameter Φ of partMinOr the minimum wall thickness (MINI W.) t of housingMin；Second, the phase-change energy storage device dot matrix sandwich forming process The fine and close dot matrix cell element full-size Max at top, the deformation of case top structure in forming process otherwise can occur or cave in, lead Cause shaping structures failure；The specific value of these three parameters is melted and molded equipment, metal powder material, manufacture work with selective laser Skill parameter and properties of product require relevant.With reference to the design and manufacturing experience of current space industry phase-change energy storage device structure, The diameter of phi of cylindrical rod piece and the wall thickness t of housing are typically taken as 0.3mm, and the full-size of fine and close dot matrix cell element is typically taken as 4mm, the value of this group of parameter can be with carrying out analysis corrections according to increasing material manufacturing process-technology-evolutions and application demand.
(2) overall structure form designs
Width, height, the thickness of housing are designated as W, H, T respectively, and width and height are in hundred millimeter magnitudes, and thickness is in ten millis Rice magnitude.The specific value of width and height is typically consistent with the mounting surface size of precision equipment, if mounting surface size exceeds hundred Millimeter magnitude, then multiple regions can be classified as, ensure the size in each region in hundred millimeter magnitudes, so as to meet laser Limitation of the selective melting former to phase-change energy storage device size；Thickness is designed according to installing space, is typically existed 10mm is between 30mm.According to the actual requirements, W, H, T value are determined.
It is uniform thickness housing by exterior design, inside is adopted to meet outside sealing and the internal functional requirement connected Three-dimensional net structure is cooperatively formed with sparse dot matrix cell element and fine and close dot matrix cell element；The effect of sparse dot matrix cell element is to realize light weight Change support, and the effect of fine and close dot matrix cell element is that the deformation of case top structure in manufacturing process is reduced or avoided or caves in, it is dilute Dredge the selected lightweight excellent performance of type of dot matrix cell element and fine and close dot matrix cell element and manufacturability it is strong to pyramid shape knot Structure.
(3) sparse dot matrix cell element and its spatial distribution design
Sparse dot matrix cell element is filled out in the sparse dot-matrix array of enclosure interior spatial translation arrangement form by sparse dot matrix cell element Width, height, the thickness for filling the sparse dot-matrix array region to be formed are respectively W1=W- Φ, H1=H- Φ, T1=T- Φ are sparse Dot-matrix array region is smaller Φ in the size of three orthogonal directions than housing in the size of three orthogonal directions, is to ensure to increase material The outline of the sparse dot matrix cell element filling region of structure is manufactured just without departing from shell structure appearance and size, because cylindrical bar Part diameter is simultaneously not zero.
Sparse dot matrix cell element is in the design size of three orthogonal directions (i.e. the width of housing, height and thickness direction) D1、D2And D3；Preferably, D1=D2=D3=(T- Φ)/2, the purpose for subtracting Φ are the structure foreign steamers in order to ensure to manufacture It is wide just without departing from thickness of shell, divided by 2 purpose be in order to ensure there was only two layers of sparse dot matrix cell element in thickness of shell direction, Because under existing increasing material manufacturing precision process constraints, the lightweight better performances of this double layer design, have compared with High voidage and volumetric capacity, while rod member is reduced because the thermal stress or military service load of manufacturing process cause strut buckling to be asked Topic.
(4) fine and close dot matrix cell element and its spatial distribution design
Fine and close dot matrix cell element is d in the design size of three orthogonal directions1=D1/ 2, d2=D2/ 2, d3=D3/ 2, it is this to set Meter is to ensure preferable integrated performance between fine and close dot-matrix array and sparse dot-matrix array；Fine and close dot matrix cell element is in housing Inner space translates arrangement form densification dot-matrix array, and the fine and close dot-matrix array region formed is filled by fine and close dot matrix cell element Width, height, thickness are respectively W2=W- Φ, H2=(n+0.25) × D1, T2=T- Φ, n are positive integer, fine and close dot matrix cell element The design of the area size of filling is to realize the seamless spliced of fine and close dot-matrix array and sparse dot-matrix array, avoid the occurrence of outstanding Armed lever part, and due to the partial collapse failure and the post processing of inside configuration fifth wheel in manufacturing process caused by cantilever rod member Cleaning is difficult；N, which is generally less than, is equal to 5, is to reduce the number of plies excessively caused weight increase.
(5) macroscopical physical model is established
3 d geometric modeling, housing are carried out to sparse dot-matrix array region, fine and close dot-matrix array region and housing respectively On fabrication hole, fill hole, housing inner mold face edge chamfering, housing outer mold surface edge chamfering, technique Hole chamfering and fill hole Chamfering will be established simultaneously；Wherein, width, height, the thickness of housing, sparse dot-matrix array region and fine and close dot-matrix array region See step (2), (3) and (4), the wall thickness t of housing should meet the process constraint of step (1).
(6) microcosmic lattice model is established
The geometrical model to rectangular pyramid dot matrix cell element is established, the geometrical model external envelope is cubic shaped.According to step (3) and (4) sparse dot matrix cell element size for setting and fine and close dot matrix cell element size, and with the sparse dot matrix of sparse dot matrix cell element filling The inner space of array region macromodel, the inside that fine and close dot-matrix array regional macro model is filled with fine and close dot matrix cell element are empty Between, cylindrical rod piece diameter attribute is assigned respectively to the microcosmic sparse lattice model and microcosmic fine and close lattice model established, ΦMin≤Φ≤3ΦMin, it is to ensure that microcosmic lattice structure model meets the process constraint of step (1), have simultaneously here Preferable lightweight performance, retains the microcosmic lattice model established, deletes sparse dot-matrix array regional macro model and densification Dot-matrix array regional macro model；
(7) grand microcosmic integrated model is established
The microcosmic sparse lattice model and microcosmic fine and close lattice model that step (6) is established, and step (5) are established Macroscopical Shell Structure Model, assembled so that the geometric center in sparse dot-matrix array region and the geometric center weight of housing It is folded, to ensure that microcosmic lattice structure is surrounded by the outline of Shell model just, cylindrical rod piece protrusion is not produced in housing Outside phenomenon, form grand microcosmic integrated model.
(8) mechanical strength analysis checking
The grand microcosmic integrated model established to step (7) carries out finite element dynamics calculating, analyzes in design load condition Whether lower structural strength meets margin of safety requirement, if then carrying out step (9)；If it is not, the portion occurred according to maximum stress Position, increase the wall thickness of housing or the diameter of cylindrical rod piece, or the filling region of the fine and close dot matrix cell element of adjustment, until meeting intensity Margin of safety requires that the design parameter adjustment in the step needs to meet abovementioned steps requirement；
(9) design result output and manufacture
The grand microcosmic integrated model for meeting mechanical strength requirement is exported, and entered using selective laser smelting technology Row increasing material manufacturing, obtain phase-change energy storage device dot matrix sandwich.
It is as follows that selective laser is melted and molded technological parameter setting：Laser power 340W~380W, sweep speed 1000mm/s ~1500mm/s, filling line spacing 0.15mm~0.25mm, heat energy metric density 1.00J/mm2~2.00J/mm2。
In order to ensure good increasing material manufacturing quality, ΦMin>=0.3mm, tMin≥0.3mm；Preferably, 0.3mm≤Φ≤ 1mm, wall thickness 0.3mm≤t≤1mm of housing, and Φ≤t.
The dot matrix sandwich selects metal material, preferably AlSi10Mg aluminium alloys, ensure that excellent mechanical property And heat conductivility, meet the multi-functional requirement of spacecraft lightweight.
The chamfer radius of housing outer mold surface seamed edge are 0.3mm~0.5mm, the chamfer radius of inner mold face seamed edge for 0.5mm~ 1.0mm, fabrication hole and the chamfering radius of curvature for filling hole are 0.3mm~0.5mm, to reduce stress collection of the structure at seamed edge In, ensure structural strength.
Beneficial effect：
Design method of the present invention considers increasing material manufacturing process constraint, can be quick by the means of grand microcosmic combination Design the integral structure for meeting increasing material manufacturing requirement；The phase-change energy storage device dot matrix obtained using the method for the invention is pressed from both sides Rotating fields no-welding-seam, in the absence of strength problem caused by welding, possesses excellent mechanical property；Enclosure interior is designed to three dimensional network Network structure, the light-weight design for realizing phase-change energy storage device structure connects with inside, compared with traditional structure loss of weight more than 60%；Adopt With two kinds of dot matrix cell element mixing fillings, avoid the top structure deformation of manufacturing process or cave in；By to different cell element sizes And corresponding dot-matrix array area size is adjusted, realize seamless spliced between different cell elements, avoid the occurrence of cantilever rod member Post processing with inside configuration fifth wheel is cleared up difficult；Design method of the present invention is in space flight, aviation, the energy and precision instrument Had a good application prospect in terms of phase-change energy storage device structure design Deng field.
Brief description of the drawings
Fig. 1 is the structural representation of sparse dot matrix cell element.
Fig. 2 is the structural representation of fine and close dot matrix cell element.
Fig. 3 is the phase-change energy storage device dot matrix sandwich interior three-dimensional network structure of the present invention based on increasing material manufacturing Structural representation.
Fig. 4 is the structural representation of the phase-change energy storage device dot matrix sandwich housing of the present invention based on increasing material manufacturing Figure.
Fig. 5 is the flow chart of design method of the present invention.
Wherein, the sparse dot matrix cell elements of 1-, 2- densification dot matrix cell elements, the sparse dot-matrix arrays of 3-, 4- densification dot-matrix arrays, 5- shells Body.
Embodiment
The present invention is further elaborated with reference to the accompanying drawings and detailed description.
A kind of phase-change energy storage device dot matrix sandwich based on increasing material manufacturing, the dot matrix sandwich are using increasing material The integral structure that manufacturing process is prepared, outside is housing 5, and inside is three-dimensional net structure；
The housing 5 is a rectangular parallelepiped structure, and fabrication hole is machined with housing 5 and fills hole, and respectively to housing 5 The hole that fills on inner mold face seamed edge, the outer mold surface seamed edge of housing 5, the fabrication hole on housing 5 and housing 5 carries out chamfering；
The three-dimensional net structure is to be put down by 2 two kinds of repeat units of sparse dot matrix cell element 1 and fine and close dot matrix cell element in space Move arrangement form；Wherein, sparse dot matrix cell element 1 and fine and close dot matrix cell element 2 be by eight cylindrical rod pieces form to four Pyramidal structure, one end of eight cylindrical rod pieces intersect at a point, by four end points of the wherein four cylindrical rod piece other ends Connect to form a rectangle, four end points of other four cylindrical rod piece other ends are connected and also form one Rectangle, as depicted in figs. 1 and 2.
As shown in figure 5, the specific design step of dot matrix sandwich described in the present embodiment is as follows：
(1) increasing material manufacturing process constraint is analyzed
The phase-change energy storage device physical dimension requirement according to the present embodiment, technology is melted and molded using selective laser and carried out Manufacture；Compared to other increases material manufacturing technologies, selective laser is melted and molded the labyrinth that technology is more suitable for hundred mm-scales Shaping, formed precision are higher；
Technology is melted and molded for selective laser, the present embodiment is raw material from AlSi10Mg aluminium alloys, the material power Performance and good with heat conductivility is learned, meets the multi-functional requirement of spacecraft lightweight；
However, the main technique constraint that selective laser is melted and molded technology includes two aspects：First, the circle of stable molding The minimum diameter Φ of cylindricality rod memberMinOr the minimum wall thickness (MINI W.) t of housing 5Min；Second, at the top of the dot matrix sandwich forming process The full-size Max of fine and close dot matrix cell element 2, the deformation of the top structure of housing 5 in forming process otherwise can occur or cave in, cause Shaping structures fail；The specific value of these three parameters is melted and molded equipment, metal powder material, manufacturing process with selective laser Parameter and properties of product require relevant；
In addition, in the fabrication process not by the way of slant setting structure, reason be in order to make full use of the device space, Ensure the manufacturability of large scale phase-change energy storage device structure, while ensure the properties of product stability of different dimensional structures.
(2) overall structure form designs
As shown in figure 4, the width of housing 5, height, thickness are designated as W, H, T respectively, width and height are in hundred millimeters of amounts Level, thickness is in ten millimeter magnitudes；Required according to the size of specific phase-change energy storage device structure, in the present embodiment, W=243mm, H =167mm, T=15mm；
It is uniform thickness housing 5 by exterior design, inside is adopted to meet outside sealing and the internal functional requirement connected Three-dimensional net structure is cooperatively formed with sparse dot matrix cell element 1 and fine and close dot matrix cell element 2；The effect of sparse dot matrix cell element 1 is to realize Lightweight supports, and the effect of fine and close dot matrix cell element 2 is that the deformation of the top structure of housing 5 in manufacturing process is reduced or avoided or collapses Collapse；Sparse dot matrix cell element 1 and fine and close born of the same parents' dot matrix cell element 2 are both designed as to pyramid shape structure, and the structure is in phase homogenous quantities Under the conditions of possess excellent mechanics rigidity and strength character, and manufacturability is strong.
(3) sparse dot matrix cell element and its spatial distribution design
Sparse dot matrix cell element 1 is in the design size of three orthogonal directions (i.e. the width of housing, height and thickness direction) D1=D2=D3=(T- Φ)/2=7.3mm, make the thickness direction of housing 5 only have two layers of sparse dot matrix cell element 1 to form；By sparse point Width, height, the thickness in the sparse dot-matrix array region that the battle array filling of cell element 1 is formed are respectively W1=W- Φ=242.6mm, H1= H- Φ=166.6mm, T1=T- Φ=14.6mm, as shown in figure 3, size of the sparse dot-matrix array region in three orthogonal directions It is smaller Φ in the size of three orthogonal directions than housing 5, it is to ensure the outer of the sparse dot-matrix array region of increasing material manufacturing structure Profile is just without departing from the appearance and size of housing 5, because cylindrical rod piece diameter and being not zero.
(4) fine and close dot matrix cell element and its spatial distribution design
Fine and close dot matrix cell element 2 is d in the design size of three orthogonal directions1=d2=d3=D1/ 2=3.65mm；By densification Width, height, the thickness in the fine and close dot-matrix array region that the filling of dot matrix cell element 2 is formed are respectively W2=W- Φ=242.6mm, H2 =(n+0.25) × D1=9.125mm, T2=T- Φ=14.6mm, the design of the area size that fine and close dot matrix cell element 2 is filled be for Realization fine and close dot-matrix array 4 is seamless spliced with sparse dot-matrix array 3, avoids the occurrence of cantilever rod member, and due to cantilever lever The post processing cleaning of partial collapse failure and inside configuration fifth wheel in manufacturing process caused by part is difficult.
(5) macroscopical physical model is established
Three-dimensional is carried out to sparse dot-matrix array region, fine and close dot-matrix array region and housing 5 using ProE softwares respectively Geometric Modeling, fabrication hole on housing 5 and fills hole, the inner mold face edge chamfering and outer mold surface edge chamfering, fabrication hole of housing 5 Chamfering and fill Hole chamfering and will establish simultaneously；And established three macroscopical physical models are exported as IGS forms respectively File；
Wherein, width, height, the thickness of housing 5, sparse dot-matrix array region and fine and close dot-matrix array region are shown in step (2), (3) and (4)；The wall thickness t of housing 5 should meet the process constraint of step (1), the present embodiment t=0.4mm；Fabrication hole internal diameter φ 4.5mm, external diameter φ 6.5mm and length 4.5mm, hole internal diameter φ 3.5mm, external diameter φ 6.5mm and length 4.5mm are filled, The chamfer radius of outer mold surface seamed edge are 0.5mm, and the chamfer radius of inner mold face seamed edge are 0.8mm, fabrication hole and the chamfering for filling hole Radius of curvature is 0.5mm.
(6) microcosmic lattice model is established
Three IGS formatted files that step (5) generates are read in using with the 3-matic softwares of increasing material manufacturing hardware compatibility, The geometrical model to rectangular pyramid dot matrix cell element is established, the model external envelope is cubic shaped, is connected from body-centered position to 8 angle points Connect to form 8 lines, as depicted in figs. 1 and 2.The size of the sparse dot matrix cell element 1 set according to step (3) and (4) and fine and close point The size of battle array cell element 2, the inner space of sparse dot-matrix array regional macro model is filled with sparse dot matrix cell element 1, with fine and close point Battle array cell element 2 fills the inner space of fine and close dot-matrix array regional macro model, to the microcosmic sparse lattice model established and micro- See fine and close lattice model and assign cylindrical rod piece diameter attribute respectively, retain the microcosmic lattice model established, delete sparse point A burst of column region macromodel and fine and close dot-matrix array regional macro model；In order to ensure that microcosmic lattice structure model meets step (1) process constraint, while there is preferable lightweight performance, diameter of phi=0.4mm.
(7) grand microcosmic integrated model is established
Microcosmic sparse lattice model, the microcosmic fine and close lattice model that step (6) is established, and step (5) are established Macroscopical Shell Structure Model, assembled so that the geometric center in sparse dot-matrix array region and the geometric center weight of housing 5 It is folded, to ensure that microcosmic lattice structure is surrounded by the outline of Shell model just, cylindrical rod piece protrusion is not produced in housing 5 Outside phenomenon, form grand microcosmic integrated model.
(8) mechanical strength analysis checking
The grand microcosmic integrated model established using Patran/Nastran softwares to step (7) carries out finite element dynamics meter Calculate, analyze the stress of the structure under the effect of 0.3MPa inner pressuring loads, it is 68.1MPa that maximum stress, which is calculated, is much smaller than AlSi10Mg yield strength 160Mpa, there is enough margins of safety, meet space flight requirement.
(9) design result output and manufacture
The grand microcosmic integrated model for meeting mechanical strength requirement is exported using 3-matic softwares, and utilizes and swashs Light selective melting technology carries out increasing material manufacturing, obtains the phase-change energy storage device dot matrix sandwich；
It is as follows that selective laser is melted and molded technological parameter setting：Laser power is 370W, sweep speed 1500mm/s, is filled Line spacing 0.19mm, heat energy metric density 1.30J/mm2。
Use the present embodiment methods described design the obtained actual weight of phase-change energy storage device dot matrix sandwich for 121g, and traditional phase-change energy storage device construction weight of identical appearance size is 269g, and 65% is up to compared with traditional structure loss of weight.
In summary, presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention. Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's Within protection domain.

Claims (8)

  1. A kind of 1. design method of the phase-change energy storage device dot matrix sandwich based on increasing material manufacturing, it is characterised in that：The point Battle array sandwich is the integral structure being prepared using increasing material manufacturing technique, and outside is housing (5), and inside is three-dimensional network Structure；The housing (5) is a rectangular parallelepiped structure, and fabrication hole is machined with housing (5) and fills hole；The three-dimensional network knot Structure is in spatial translation arrangement form by (2) two kinds of repeat units of sparse dot matrix cell element (1) and fine and close dot matrix cell element；Wherein, Sparse dot matrix cell element (1) and fine and close dot matrix cell element (2) be by cylindrical rod piece form to rectangular pyramid structure；
    The design method step is as follows,
    (1) increasing material manufacturing process constraint is analyzed
    For the phase-change energy storage device of hundred mm sizes, it is melted and molded technology from selective laser and is manufactured；Selected according to laser Area is melted and molded the process constraint of technology, determines the minimum diameter Φ of cylindrical rod pieceMin, housing (5) minimum wall thickness (MINI W.) tMinWith And the full-size Max of fine and close dot matrix cell element (2)；
    (2) overall structure form designs
    Outside is housing in uniform thickness (5), and its width, height, thickness are designated as W, H, T respectively, is filled according to specific phase-change accumulation energy The size requirement put, determine W, H, T value；Matched somebody with somebody inside housing (5) using sparse dot matrix cell element (1) and fine and close dot matrix cell element (2) Conjunction forms three-dimensional net structure, meets outside sealing, internal connection and light-weighted requirement；
    (3) sparse dot matrix cell element and its spatial distribution design
    Sparse dot matrix cell element (1) translates the sparse dot-matrix array of arrangement form (3) in housing (5) inner space, and by sparse dot matrix Width, height, the thickness in the sparse dot-matrix array region that cell element (1) filling is formed are respectively W1=W- Φ, H1=H- Φ, T1= T-Φ；Wherein, Φ is the diameter of cylindrical rod piece；
    (4) fine and close dot matrix cell element and its spatial distribution design
    Fine and close dot matrix cell element (2) is d in the design size of three orthogonal directions1=D1/ 2, d2=D2/ 2, d3=D3/2；Wherein, D1、 D2And D3It is sparse dot matrix cell element (1) in three corresponding design sizes of orthogonal direction；
    Fine and close dot matrix cell element (2) translates arrangement form densification dot-matrix array (4) in housing (5) inner space, and by fine and close dot matrix Width, height, the thickness in the fine and close dot-matrix array region that cell element (2) filling is formed are respectively W2=W- Φ, H2=(n+0.25) × D1, T2=T- Φ, n are positive integer；
    (5) macroscopical physical model is established
    Design requirement according to step (1)~(4) to size, respectively to sparse dot-matrix array region, fine and close dot-matrix array region And housing (5) carries out 3 d geometric modeling, fabrication hole on housing (5) and fill hole and to establish simultaneously；
    (6) microcosmic lattice model is established
    It is sparse to sparse dot matrix cell element (1) and the design requirement of fine and close dot matrix cell element (2) size, use according to step (3) and (4) Dot matrix cell element (1) fills the inner space of sparse dot-matrix array regional macro model, and fine and close point is filled with fine and close dot matrix cell element (2) The inner space of a burst of column region macromodel, the microcosmic sparse lattice model and microcosmic fine and close lattice model established are distinguished Assign cylindrical rod piece diameter attribute, ΦMin≤Φ≤3ΦMin, while delete sparse dot-matrix array regional macro model and densification Dot-matrix array regional macro model；
    (7) grand microcosmic integrated model is established
    The microcosmic sparse lattice model and microcosmic fine and close lattice model that step (6) is established, and step (5) established it is grand Shell Structure Model is seen, is assembled so that the geometric center in sparse dot-matrix array region and the geometric center weight of housing (5) It is folded, form grand microcosmic integrated model；
    (8) mechanical strength analysis checking
    The grand microcosmic integrated model established to step (7) carries out finite element dynamics calculating, analyzes and is tied under the conditions of design load Whether structure intensity meets margin of safety requirement, if then carrying out step (9)；If it is not, then change wall thickness, the cylinder of housing (5) The filling region of the diameter of shape rod member or fine and close dot matrix cell element (2), and repeat step (3)~(7)；
    (9) design result output and manufacture
    The grand microcosmic integrated model for meeting mechanical strength requirement is exported, and increased using selective laser smelting technology Material manufactures, and obtains phase-change energy storage device dot matrix sandwich.
  2. A kind of 2. design side of phase-change energy storage device dot matrix sandwich based on increasing material manufacturing according to claim 1 Method, it is characterised in that：In step (1), ΦMin>=0.3mm, tMin>=0.3mm, and the wall thickness of housing (5) is not less than cylindrical bar The diameter of part.
  3. A kind of 3. design side of phase-change energy storage device dot matrix sandwich based on increasing material manufacturing according to claim 2 Method, it is characterised in that：Diameter 0.3mm≤Φ≤1mm of cylindrical rod piece, wall thickness 0.3mm≤t≤1mm of housing (5), and Φ ≤t。
  4. A kind of 4. design side of phase-change energy storage device dot matrix sandwich based on increasing material manufacturing according to claim 1 Method, it is characterised in that：In step (4), d1=d2=d3=D1/ 2=D2/ 2=D3/ 2=(T- Φ)/2.
  5. A kind of 5. design side of phase-change energy storage device dot matrix sandwich based on increasing material manufacturing according to claim 1 Method, it is characterised in that：In step (4), n 1,2,3,4 or 5.
  6. A kind of 6. design side of phase-change energy storage device dot matrix sandwich based on increasing material manufacturing according to claim 1 Method, it is characterised in that：To the inner mold face seamed edge of the housing (5), outer mold surface seamed edge, fabrication hole and fill hole respectively and fall Angle, correspondingly, in step (5), inner mold face edge chamfering, outer mold surface edge chamfering, technique Hole chamfering and fill Hole chamfering and exist To be established simultaneously when being modeled to housing (5).
  7. A kind of 7. design side of phase-change energy storage device dot matrix sandwich based on increasing material manufacturing according to claim 6 Method, it is characterised in that：The chamfer radius of housing (5) outer mold surface seamed edge are 0.3mm~0.5mm, and housing (5) inner mold face seamed edge falls Angular radius is 0.5mm~1.0mm, and fabrication hole on housing (5) and the chamfering radius of curvature for filling hole are 0.3mm~0.5mm.
  8. A kind of 8. design side of phase-change energy storage device dot matrix sandwich based on increasing material manufacturing according to claim 1 Method, it is characterised in that：In step (9), the technological parameter of increasing material manufacturing is carried out using selective laser smelting technology：Laser power 340W~380W, sweep speed 1000mm/s~1500mm/s, filling line spacing 0.15mm~0.25mm, heat energy metric density 1.00J/mm2~2.00J/mm2。
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CN109101671A (en) * 2018-06-11 2018-12-28 北京航空航天大学 A kind of variable density and allosteric type three-dimensional lattice structure modelling method
CN109101671B (en) * 2018-06-11 2023-01-17 北京航空航天大学 Variable density and variable configuration three-dimensional lattice structure modeling method
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CN109878091A (en) * 2019-03-06 2019-06-14 北京灵动飞天动力科技有限公司 A kind of micro-structure member forming method of the loss of weight suitable for 3D printing
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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
CN112028658A (en) * 2020-08-04 2020-12-04 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） Wave-transparent structure with controllable electromagnetic performance
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