CN1749079A - Method for producing magnetic suspension vehicle headstock and its sandwich structure - Google Patents
Method for producing magnetic suspension vehicle headstock and its sandwich structure Download PDFInfo
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- CN1749079A CN1749079A CNA2005100218835A CN200510021883A CN1749079A CN 1749079 A CN1749079 A CN 1749079A CN A2005100218835 A CNA2005100218835 A CN A2005100218835A CN 200510021883 A CN200510021883 A CN 200510021883A CN 1749079 A CN1749079 A CN 1749079A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T30/00—Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
Abstract
The present invention discloses the manufacture of magnetic suspension vehicle head and its sandwich structure. The head has front part of ellipsoidal streamline profile with backward inclination angle of 56-66 deg, and is one symmetrical shape with large front part and small back part. The head has top plate, side walls, back wall and cover plate in sandwiched structure comprising assembled PMI foam boards, and the sandwiched structure includes copper wire net on one side and composite material facing board. The sandwiched structure is made through thermal forming PMI foam, setting ventilation felt on the surface of the PMI foam, making vacuum bag, heating to softening temperature, maintaining and demolding. The ellipsoidal streamline profile has wind drag 5-12 % lower than that of spherical one, high impact resistance and high collision resistance.
Description
Technical field
The present invention relates to the manufacture method of a kind of magnetic suspension vehicle headstock and sandwich structure thereof.
Background technology
In the known technology, be the reinforcement hot-short, rigidity, the intensity of aircraft composite material face sandwich component, expendable weight reduces noise, all will adopt metal or non-metal honeycomb sandwich structure to it usually.Though metal beehive sandwich structure has Machining of Curved Surface performance preferably, its intensity, rigidity, thermal endurance and flame resistance are not as extensively adopting the panel-sandwich foam plastics at aircraft, high-speed maglev train headstock in recent years.The panel of foam sandwich construction is the main stressed member of sandwich structure.When structure stress, mainly bear tension and compression load in the face that causes by moment of flexure by upper and lower panel.Foamed materials then plays a part to connect and support panel in sandwich structure, mainly bears the shearing stress that is produced by transverse force.1 kilogram of standard stone can not penetrate with 600 kilometers speed bumps hourly and 0.5 kilogram of flying bird does not produce structural failure with 500 kilometers speed bumps hourly because the high-speed maglev train headstock will stand.And the PF that generally uses at present, PU unicellular foamed plastic cores be because of existing the defective of low-intensity, fragility, and can not meet the demands.Along with the development of technology, high strength, high tenacity, high rigidity, anti-combustion and can heat or be machined into the polyetherimide PEI of Special-Shaped Surface or polyesterimide PMI foamed plastic arises at the historic moment as the panel of the sandwich structure of sandwich material.This polyesterimide PMI foamed plastic (hereinafter to be referred as the PMI foam) is the highest heat-resisting foamed plastic of present strength and stiffness, it at high temperature has very high creep-resistant property, can bear of the requirement of the co-curing technology of 190 degree to foam size stability, and have good gleyness and isotropy between the resin, and the easy various uncomplicated shapes of machine-shaping, and not fluorine-containing Lyons, fire resistance can reach standards such as FAR25.8 and AITM, is the novel core that can replace honeycomb structure.Its Combination property is very outstanding, and using value is high.But polyesterimide PMI foamed plastic is as a kind of thermoset macromolecule material, and itself is insoluble not molten, even can not melt under any high temperature, is not dissolved in any solvent yet, does not almost have softening possibility.Thereby make polyesterimide PMI foamed plastic form the fixed pattern prejudice of can only the Heat forming curvature very little product.Aspect splicing, also there is the inboard contact interface adhesive strength of foam layer and composite material face, the problem how compound back bubble is got rid of smoothly.In order to solve the problems referred to above that polyesterimide PMI foamed plastic exists, the Adtranz company that can make the company of Japanese East Japan Railway of high-speed magnetic levitation vehicle, Canadian Bombardier (Bombadier Inc) and Germany has at present adopted more advanced vacuum bag/solidification of hot-press tank, vacuum-assisted to inject whole winding technology to relating to the head manufacturing, adopt the foam fusion, utilize the bonding headstock PMI foamed plastic interlayer of vacuum suction moulding specialized equipment High Temperature High Pressure.Very high of the equipment that is shaped, and complicated, and technological condition requires also high.China also is in the primary stage of groping to study in the development of PEI and PMI foamed plastic, also neither one can satisfy and relates to the magnetic suspension vehicle headstock composite material face and combine manufacturing process with the PMI foamed sandwich structure, and especially (size reaches the bibliographical information of 5m * 4m) and uses example ultra-large type.
The magnetic suspension vehicle headstock end car front portion of prior art is a sphere simple in structure, end car front end face wind shelves casterangle θ=51.1 °, and end car front end base plate is a flat segments.Its weak point is that the headstock head resistance is big, and aeroperformance is poor, and the anti-lightning strike effect of headstock is bad.
Summary of the invention:
The purpose of this invention is to provide a kind of cheap, equipment is simple, and technological condition is less demanding, can low-cost moulding headstock curvature profile, no bubble glueds joint headstock composite material face and PMI foamed sandwich structure, can avoid the magnetic suspension vehicle headstock that is struck by lightning and the manufacture method of sandwich structure thereof.
A kind of magnetic suspension vehicle headstock provided by the invention, comprise sphere shape headstock, the first bottom section of glass vehicle window and car, the front portion that it is characterized in that described sphere headstock is the ellipsoid streamline surface, the casterangle of described ellipsoid streamline surface is 56 ° ~ 66 °, and the headstock both sides pre-small post-large symmetry of object plane extends to the headstock rear end, the interlayer of the roof hoard of described headstock, sidewall, rear wall, cover plate is pieced together connection by some blocks of PMI cystosepiment cores and is gluedd joint the interlayer of forming, the sidewall of described interlayer has at least a side to be connected with the copper wire grid, and by composite material face clamping connection from outside to inside.
The manufacture method of sandwich structure of the present invention comprises the following steps:
(1). the PMI cystosepiment is placed on the curved surface forming mould, and airfelt is put on the surface, is sealed in the vacuum bag, puts into baking oven or autoclave then, is warmed to 170～210 ℃ and carries out softening before the moulding;
(2)., vacuumize simultaneously or press molding more than 15 minutes according to depth of foam insulation, to be formed after demoulding pickup, to thickness big add pressurize cooling after at least 15 minutes below the external pressure 0.3MPa;
(3). the metal sheet that surface treatment is good or the PMI foam of aluminium alloy panel and forming are put into the frock of metal or non-metal band curvature die cavity or are gluedd joint frock, finish splicing with glued membrane or adhesion agent laying again;
(4). be cured moulding with vacuum bag/autoclave or vacuum bag/baking oven.
PMI cystosepiment of the present invention carries out in baking oven or autoclave heat preferably 190 ℃～205 ℃ of sinter points,
The present invention puts into the epoxy resin glued membrane or glueds joint PMI foam that frock glueds joint can be the splicing that the multilayer laying is finished metal decking or composite material and interface, PMI cystosepiment inboard, carries out the co-curing moulding with vacuum bag/autoclave or vacuum bag/baking oven again.
Of the present invention according to the depth of foam temperature retention time preferably by empirical equation: t 〉=15+ δ (t: insulation the number of minutes, δ depth of foam (unit: mm)) experience determine,
Glued membrane of the present invention can be the epoxy resin glued membrane.
The present invention can also glued joint press molding by splicing for superhuge sandwich PMI foam.
Composite material of the present invention can be that glass fabric/unsaturated polyester (UP) or epoxy resin composite material mix, and also can be glass-reinforced plastic material.
The present invention has following good effect than prior art.
It is the aerodynamic configuration of 56 ° ~ 66 ° the pre-small post-large symmetry extension of ellipsoid streamline surface and headstock both sides that the present invention adopts casterangle, pneumatic streamline is smooth and easy, the air-flow object plane flows stable, drag characteristic improves a lot, windscreen resistance ratios spherical headstock can reduce 5%～12%. normal direction impact load that can reduce from the sudden thing in windscreen the place ahead, has further improved the crashproof ability of headstock wind shelves.Adopt some blocks of PMI cystosepiment cores to piece together the interlayer of the top board of connection splicing formation, sidewall, rear wall, cover plate, overcome the prejudice that needs the high equipment of import just can finish the complicated interlayer of PMI cystosepiment core.The sidewall of interlayer is connected with the copper wire grid, can avoid the accidental possibility of being struck by lightning of headstock.This sandwich structure has effectively remedied the low deficiency of galss fiber reinforced resin sheet material modulus of elasticity.And because the volume mass of PMI cystosepiment core is little, under the condition of same load-carrying capacity, PMI cystosepiment sandwich construction is compared with non-sandwich construction, and the deadweight of structure greatly alleviates, and has satisfied high strength, high rigidity, lightweight requirement.In addition, it is better to have sound insulation, a heat-proof quality of PMI cystosepiment core of microcellular structure.The PMI cystosepiment core sandwich structure that adopts, satisfied the each side operating needs of high speed train headstock, had both sound insulation, heat-insulating function, changed on the conventional train and must adopt special sound insulation, thermal insulation material but few, the present situation of gaining in weight the contribution of rigidity of structure intensity.
The present invention adopts baking oven or autoclave prior art equipment, the PMI cystosepiment is sealed in vacuum bag to be warmed to 170～210 ℃ and to carry out before the moulding softening, especially 190 ℃～205 ℃ sinter points, avoided the too high easy decomposition of polyesterimide PMI foamed plastic temperature rightly, temperature is crossed low not softening defective.It not only avoided can only with external high equipment could formed product dependence, and simplified technology, and accelerated the shaping process of product, shortened the production cycle, reduce cost, simultaneously also overcome the fixed pattern prejudice of can only the Heat forming curvature very little product of PMI foam.The processing step of wherein the PMI foam being put into curved surface forming mould press molding has solved the shaping than complex profile.The method of finishing splicing with the glued membrane laying has solved composite material face and the problem that needs to get rid of bubble is gluedd joint with adhesive in the inboard interface of PMI cystosepiment, and it is smooth reliable to glued joint the interface, the intensity height.Superhuge sandwich PMI foam glueds joint the manufacturing that pressing/molding method has taken the lead in solving ultra-large type complex profile, high strength, high rigidity, high temperature resistant, maglev vehicle car body wallboard that sound insulation is good at home by splicing, realized the manufacturing of high-speed maglev train head, side plate, floor, top board, skirtboard multilayer non-metal/composite material interlayer material structure spare.
Description of drawings
Fig. 1 is the organigram of headstock of the present invention and car body.
Fig. 2 is the sandwich structure scheme drawing of invention.
The specific embodiment
The invention will be further described below in conjunction with embodiment.
Fig. 1 has described the structure of headstock of the present invention and car body.Headstock 3 is anterior for 55 °～66 ° casterangle of ellipsoid streamline surface is being positioned at the plane of a glass vehicle window and a car bottom section 2 in the present embodiment, i.e. the angle of the vertical line of vertical track face 14 and ellipsoid profile tangent line formation.The optimized angle of this angle can be 57 °～61 °.Headstock 3 both sides can be the parabolas that pre-small post-large symmetry extends to headstock 3 rear ends, but to be not limited to be parabolic.Headstock 3 is made of a self-supporting composite plate structure, and described composite panel can be glass-felt plastic/Polyester resin cover plate, also can be that glass fabric/unsaturated polyester (UP) or epoxy resin composite material mix composite panel.Bonding on door pillar 4 and top board 8 edges with car body floor and cylindrical carriage body construction, constitute operator's compartment.Each spherical glass directly is bonded on the headstock about the headstock front window.The headstock bottom section is positioned at under-cab, is used to cover headstock and makes it satisfy the aerodynamic force requirement, is connected on the car body floor 10 by bonding.Headstock Windshield 1 and side window 7 bonding or glass-felt plastic and aluminium section bar bonding with glass-felt plastic.The interlayer of the roof hoard of described headstock 2, sidewall, rear wall, cover plate comprises the car door 5 of car body, window post 6,, top board 8, sidewall 9, floor 10, skirtboard 13 can be made core by the PMI cystosepiment of some segmentations and piece together connection and glued joint and form interlayer.The glass reinforced plastic panel that described sandwich structure is can be by two layers of thin high-strength presss from both sides a bed thickness therebetween and the PMI foam core material of lightweight is formed, and adds two adhesive linkages of upper and lower panel and PMI foam core material, and these five key elements have constituted a single-piece sandwich structure.The outer covering layer of interlayer can be glass-felt plastic or aluminium sheet, and the ground floor of the inner covering layer of interlayer and the second layer can be glass-felt plastic and aramid fiber cloth.Sidewall one side of interlayer or the metal filament that two sides can be furnished with can be the copper wire grids, also can be stainless steel wire or other metallic conductor silk, promptly lay copper mesh and ground connection between glass reinforced plastic panel and core.And by composite material face clamping connection from outside to inside.We can select the core of the PMI foam core material of Rohacell company as the magnetic suspension vehicle headstock structure for use by comparing modulus of shearing, shearing strength value, compression strength and HDT Heat Distortion Temperature and fatigue property.Glass reinforced plastic panel can adopt VTM264 prepreg overlay, Autoclave forming.The below of orbital plane 14 is to connect the Z of car body to bearing 11 and traveling gear 12.
Fig. 2 has described the sandwich structure that glass outer steel facing 16, inner layer glass steel facing 17, copper mesh 15, PMI foam core material 18 constitute.Its manufacturing process can be to lay glass outer steel facing 16 in former, lays copper mesh 15 and PMI foam core material 18, inner layer glass steel facing 17 successively, and the most laggard solidification of hot-press tank is shaped to sandwich structure.
When making interlayer, at first the PMI cystosepiment is put into mould, airfelt is put on the surface, be sealed in the vacuum bag, then the PMI cystosepiment is put into baking oven or autoclave is heated, heat make it softening to 170～210 ℃ after, softening optimum temperature is 190 ℃～205 ℃, can use empirical equation according to the depth of foam temperature retention time: t 〉=15+ δ (t: insulation the number of minutes, δ depth of foam (unit: mm)) calculates and relies on working experience to determine the time of insulation, to time of the PMI cystosepiment of 20mm～40mm thickness insulation usually about 30～60 minutes, simultaneously the PMI cystosepiment after softening is vacuumized or pressurizes, to be formed after the demoulding take out.Can add pressurize cooling after at least 15 minutes below the external pressure 0.3MPa to the big PMI cystosepiment of thickness.The frock of curvature die cavity is arranged or glued joint frock the PMI foam of well-oxygenated metal sheet or aluminium alloy panel and forming being put into metal or non-metal then, glued joint with glued membrane or adhesion agent laying again.Be cured with vacuum bag/autoclave or vacuum bag/baking oven at last.The co-curing adhesive bonding technique can be used the curing of composite material and use and glued joint frock.
Putting into rubber moulding or glued joint the PMI foam that frock glueds joint can be to adopt the multilayer laying, after glued joint by technical requirements at metal decking and interface, PMI cystosepiment inboard, carries out the co-curing moulding with vacuum bag/autoclave or vacuum bag/baking oven again.Described glued membrane can be the epoxy resin glued membrane.Because the specification of present PMI cystosepiment has only 1.25m * 2.5m.For superhuge sandwich PMI foam, be about 12.2m * 2.6m such as high-speed magnetic levitation vehicle upperlimit, the compartment top board of curvature maximum; Be about most 25m, the sidewall paneling of wide about 0.8m; Be shaped as the cylinder of R6.0m, can glued joint vacuum or press molding by the butt joint splicing.
In sum, the Heat forming of PMI foam is to adopt vacuum bag/baking oven or vacuum bag/Autoclave forming technology, put airfelt, system vacuum bag on PMI cystosepiment surface, be warmed to PMI moulding sinter point (200～210 ℃), according to depth of foam insulation 30～60 minutes, insulation take out vacuum, to thickness big add pressurize cooling after at least 15 minutes, demoulding pickup below the external pressure 0.3MPa.
The splicing of composite material face and PMI foam layer composite structure can be adopted composite material co-curing technology, use to glued joint frock, PMI foam, epoxy resin compound cutan or the adhesion agent of the composite material face of laying and forming and other composite structure such as inserts laying are finished vacuum bag/autoclave or vacuum bag/curing oven moulding.
Claims (9)
1. magnetic suspension vehicle headstock, comprise sphere shape headstock, the first bottom section of glass vehicle window and car, the front portion that it is characterized in that described sphere headstock is the ellipsoid streamline surface, the casterangle of described ellipsoid streamline surface is 56 ° ~ 66 °, and the headstock both sides pre-small post-large symmetry of object plane extends to the headstock rear end, the interlayer of the roof hoard of described headstock, sidewall, rear wall, cover plate is pieced together connection by some blocks of PMI cystosepiment cores and is gluedd joint the interlayer of forming, the sidewall of described interlayer has at least a side to be connected with wire mesh grid, and by composite material face clamping connection from outside to inside.
2. by the described magnetic suspension vehicle headstock of claim 1, it is characterized in that described composite material is that glass fabric/unsaturated polyester (UP) or epoxy resin composite material mix, or glass-reinforced plastic material.
3. by the described magnetic suspension vehicle headstock of claim 1, it is characterized in that described sandwich structure comprises up and down the layer glass steel facing and pressing from both sides one deck PMI foam core material therebetween.
4. a manufacture method of making the described sandwich structure of claim 1 comprises the following steps:
(1). the PMI cystosepiment is placed on the curved surface forming mould, and airfelt is put on the surface, is sealed in the vacuum bag, puts into baking oven or autoclave then, is warmed to 170～210 ℃ and carries out softening before the moulding;
(2)., vacuumize simultaneously or press molding more than 15 minutes according to depth of foam insulation, to be formed after demoulding pickup, to thickness big add pressurize cooling after at least 15 minutes below the external pressure 0.3MPa;
(3). the metal sheet that surface treatment is good or the PMI foam of aluminium alloy panel and forming are put into the frock of metal or non-metal band curvature die cavity or are gluedd joint frock, finish splicing with glued membrane or adhesion agent laying again;
(4). be cured moulding with vacuum bag/autoclave or vacuum bag/baking oven.
5. manufacture method according to claim 4 is characterized in that, the sinter point of heating that described PMI cystosepiment carries out in baking oven or autoclave is 190 ℃～205 ℃.
6. according to claim 4 or 5 described manufacture methods, it is characterized in that the epoxy resin glued membrane of putting into or to glued joint PMI foam that frock glueds joint be the splicing that the multilayer laying is finished composite material face and interface, PMI cystosepiment inboard, carry out the co-curing moulding with vacuum bag/autoclave or vacuum bag/baking oven again.
7. according to claim 4 or 5 described manufacture methods, it is characterized in that described (t in the formula: insulation the number of minutes, the δ depth of foam (unit: mm) determine by experience by empirical equation t 〉=15+ δ according to the depth of foam vacuum heat-preserving time.
8. according to claim 4 or 5 described manufacture methods, it is characterized in that glued membrane is the epoxy resin glued membrane.
9. according to claim 4 or 5 described manufacture methods, it is characterized in that to glued joint press molding by splicing for superhuge sandwich PMI foam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100218835A CN1749079A (en) | 2005-10-18 | 2005-10-18 | Method for producing magnetic suspension vehicle headstock and its sandwich structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100218835A CN1749079A (en) | 2005-10-18 | 2005-10-18 | Method for producing magnetic suspension vehicle headstock and its sandwich structure |
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| CN1749079A true CN1749079A (en) | 2006-03-22 |
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| CNA2005100218835A Pending CN1749079A (en) | 2005-10-18 | 2005-10-18 | Method for producing magnetic suspension vehicle headstock and its sandwich structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092137A (en) * | 2010-11-12 | 2011-06-15 | 航天材料及工艺研究所 | High-temperature high-pressure vacuum nozzle and sealing method thereof |
| CN105538745A (en) * | 2015-12-14 | 2016-05-04 | 中国商用飞机有限责任公司 | Forming method of aluminum alloy fiber laminate structural part and laminate structural part thereof |
| CN106738815A (en) * | 2016-11-30 | 2017-05-31 | 江西洪都航空工业集团有限责任公司 | A kind of rigid foam core thermoforming process |
| CN113619626A (en) * | 2021-08-20 | 2021-11-09 | 中车唐山机车车辆有限公司 | Vehicle body and magnetic levitation vehicle |
-
2005
- 2005-10-18 CN CNA2005100218835A patent/CN1749079A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092137A (en) * | 2010-11-12 | 2011-06-15 | 航天材料及工艺研究所 | High-temperature high-pressure vacuum nozzle and sealing method thereof |
| CN102092137B (en) * | 2010-11-12 | 2013-06-26 | 航天材料及工艺研究所 | High-temperature high-pressure vacuum nozzle and sealing method thereof |
| CN105538745A (en) * | 2015-12-14 | 2016-05-04 | 中国商用飞机有限责任公司 | Forming method of aluminum alloy fiber laminate structural part and laminate structural part thereof |
| CN106738815A (en) * | 2016-11-30 | 2017-05-31 | 江西洪都航空工业集团有限责任公司 | A kind of rigid foam core thermoforming process |
| CN113619626A (en) * | 2021-08-20 | 2021-11-09 | 中车唐山机车车辆有限公司 | Vehicle body and magnetic levitation vehicle |
| CN113619626B (en) * | 2021-08-20 | 2023-01-24 | 中车唐山机车车辆有限公司 | Vehicle body and magnetic levitation vehicle |
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