CN102991434B - A kind of expansion slab rubber and preparation thereof, installation method - Google Patents
A kind of expansion slab rubber and preparation thereof, installation method Download PDFInfo
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- CN102991434B CN102991434B CN201210551520.2A CN201210551520A CN102991434B CN 102991434 B CN102991434 B CN 102991434B CN 201210551520 A CN201210551520 A CN 201210551520A CN 102991434 B CN102991434 B CN 102991434B
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Abstract
The invention provides a kind of expansion slab rubber and preparation thereof, installation method, belong to cavity technical field of sealing technology, it can solve existing expansion slab rubber and treat the position, corner of sealed cavity and seal halfway problem. Sealed gluing block of the present invention, by the expanding material position corresponding with the corner of cavity to be sealed is made as to ledge, ledge protrudes from expanding material at width and height both direction, has solved the problems referred to above. Meanwhile, provide a kind of preparation, installation method of expansion slab rubber, can manufacturing inexpensively by injection moulding process of expansion slab rubber, installs easily.
Description
Technical field
The invention belongs to cavity technical field of sealing technology, be specifically related to a kind of expansion slab rubber andPreparation, installation method.
Background technology
Along with improving constantly of people's environmental consciousness, vehicle noise problem has caused the whole societyGreat attention. Wherein, pass-by noise control must be with the relevant environmental regulation of increasingly stringentAnd standard is foundation, internal car noise control is devoted to meet user acoustics in car is relaxedThe day by day requirement of harshness of adaptive. Therefore, improving vehicle noise level of control has become newlyFocus of the competition and technological development direction. Under this background, the noise of vehicle, vibration andSound vibration roughness (Noise/Vibration/Harshness, NVH) performance develops and attaches most importance to just graduallyThe design objective of wanting, is also one of vehicle performance index of being concerned about of user, NVH natureAlso become gradually attraction. The automobile noise control level will become the success of decision automobile developmentThe important factor in order of whether indispensable, associated analysis, test and materialTechnology etc. become the new focus that automobile engineering field is paid close attention to naturally.
Current active noise elimination technique is still immature at present, and passive noise reduction is still vapour in recent yearsThe emphasis that garage's industry is paid close attention to, and the cavity of automobile sealing noise reduction becomes the pass of passive noise reductionOne of key technology. Due to the distinctive structural design of body of a motor car, complete after welding at vehicle body,There is cavity structure in vehicle body, because cavity is inhomogeneous, pipe resistance is larger, high velocity air is with emptyWhen chamber barrier rubs, can in cavity wall, form eddy current, produce turbulence pneumatic noise;And turbulence air-flow itself also can cause the resonance of sheet metal component, thereby produce the resonance of cavity panel beatingNoise; Meanwhile, High Speed Airflow Within is to pass-by noise (as engine noise, tire are made an uproar etc.)Also played transfer function. Therefore, suppress wind and make an uproar with regard to blocking cavity air-flow, conventionalMethod is and adopts cavity to fill Sealing Technology cavity structure to be blocked, wet preventingGas and dirt are invaded. Due to these cavitys also can with make us uncomfortable Noise Generated by Running Vehicles andThe form of wind noise is propagated noise of air, and therefore these seal approach also can be used to reduce and make an uproarSound, thus the ride comfort in automobile improved.
In traditional structure, the parts that contain these cavitys and car body component are all used half shellElement precast forms, and adopts afterwards welding, crimping or bonding way by these half mould componentsIn conjunction with the hollow profile that forms sealing. For this structure, at the early stage dress of body of a motor carThe cavity of joining under state is easy to touch, and therefore can adopt at the commitment of basic car bodyWith mechanical hook, insert among corresponding holding device, boring or welding manner be to enteringExpanding block row sealing and that play sound deadening is fixed.
Existing automobile cavity encapsulant and design are varied, and part is pasterFormula structure, it is mainly made up of macromolecule foaming absorbing sheet, binder. This kind of materialPoor for larger cavity sealing effectiveness, and it has one in vehicle body production processDetermine drawback. For the larger region of cavity, conventionally adopt the novel expansion slab rubber can be effectiveIsolated cavity, the middle part of preformed expansion slab rubber is high-temperature resistance plastice, periphery is installedBlob of viscose energy high-temperature expansion, this part is generally designed with one to two buckle, Ke Yizhi is installedConnect and be fixed on Metal Sheets for Body-manufacturing. This design and construction process is simple, can be according to when design bodyCars on hand is accurately located by mounting hole site with it, and soundproof effect is good, construction is simpleSingle, preformed expansion slab rubber technology extensive use in automotive field at present.
US Patent No. 2006/10041227A1 discloses a kind of sky with complex sectionThe sealing device that cavity configuration is used. This device comprises that shape is corresponding to of cavity structure cross sectionOne support and the second support, the second support can be (swollen by expanded material by a series of bucklesThe one of swollen material) remain between the first support and the second support, make sandwich knotStructure. At this, can, by the peripheral side of expanded material in the face of cavity structure wall, be only orientationFoaming provides may. Three installation buckles are set fixing for being arranged on the first supportOn plate, with this, whole device is fixed in cavity structure. The worker of this kind of sealing deviceSkill is loaded down with trivial details, needs three secondary injection molds, and must be by manually device being assembled into integrative-structure,Causing producing in batches cost increases.
Chinese patent CN1296451A has described expansion glue a kind of lightweight, expandablePiece, described expansion slab rubber comprises rigid support plate, this supporting plate is with being injection-moulded in outside weekEncapsulant that enclose, expandable. For propping up of land, sea or transatmospheric vehicleA kind of sealing article in support passage, for example, tie at the vehicle body of automobile or similar vehicleColumn in structure, it can easily and at an easy rate be prepared, easily by the temperature of rising cavityTo the temperature conventionally running in vehicle body operating process (for automotive lacquer baking oven be for example150 DEG C～210 DEG C) trigger, by expanded material, will provide to air, moisture, itsThe effective sealing that its undesirable fluid and particle and sound immerse, and provide swollenSeveral version of the support of swollen noise insulation block and expanded material.
US Patent No. 8087916B2 discloses a kind of sealing with complicated supporting structureDevice. This device comprises support and the expanded material of shape corresponding to cavity structure cross section,Its medium-height trestle and buckle connecting structure integrated injection molding, foaming material and support pass through secondaryInjection moulding becomes entirety. Wherein due to expanded material before not foaming with the cohesive force of supportLow, easily get loose, in order to prevent that foamable material from separating with support, therefore at supportIn the support passage of the carrying expanded material of material, arrange that a large amount of material holes of drawing fix with thisPreformed expanded material, but these methods need to increase number of components and more complicatedManufacturing process, has increased cost and the weight of assembly. In addition, draw material hole too small, can send outBubble material after thermal expansion because internal stress may be thrown off with timbering material, particularly rightIn thermoplastic polymer expanded material. And foaming and expansion direction do not obtain suitablyControlling, there is poorly sealed risk in cavity.
US Patent No. 2011/0057392A1 discloses that one has can the side of being welded and fixedThe sealing device that the cavity structure of formula is used. This device comprises that shape cuts corresponding to cavity structureThe thermoplastic support of face and metallic plate support, plastic stent can be by a series of solidFixed structure is fixed on expanded material between plastic stent and metallic support, makes sandwichStructure. Wherein on metallic support outstanding two parts for welding, by welding manner incite somebody to actionWhole device is fixed in cavity structure. The manufacturing process of this kind of sealing device is loaded down with trivial details, andMust be by manually device being assembled into integrative-structure, and in assembling process, cause increasing weldingOperation.
US Patent No. 2010/0325994A1 discloses that one has can the side of being welded and fixedThe sealing device that the cavity structure of formula is used. This device comprises that shape cuts corresponding to cavity structureThe thermoplastic support of face and metallic plate support, plastic stent can be by a series of solidFixed structure is fixed on expanded material between plastic stent and metallic support, makes sandwichStructure. Wherein on metallic support outstanding two parts for welding, by welding manner incite somebody to actionWhole device is fixed in cavity structure. The manufacturing process of this kind of sealing device is loaded down with trivial details, andMust be by manually device being assembled into integrative-structure, and in assembling process, cause increasing weldingOperation.
But along with sealing increasing of position in body of a motor car, the application of expansion slab rubber is also got overCome more extensively, bicycle quantity is corresponding increase also, therefore for traditional, complicated designWith aobvious more and more obvious of manufacturing process shortcoming. Because cavity to be sealed uses panel beating sheet materialOverlap joint forms, and can produce a lot of corners, and traditional expansion slab rubber is not to the sealing of cornerThoroughly, need to carry out special design for corner part and complete the thoroughly close of sealed cavityEnvelope.
In addition, owing to adopting sandwich structure, expanded material need to be placed between two-ply,Part for separately assembling has increased cost of labor number of molds, for secondary injection moldingExpansion slab rubber, the support passage of expanded material adopts U-shaped or C shape structure, conventionally noteMould needs one or two slide block, and therefore the available slot area of injection mold just subtractsFew, increased die cost simultaneously, cost per unit also increases thereupon simultaneously.
And employing sandwich structure, due to expanded material be clipped in two thermoplastic sheets itBetween or between metallic plate, its heating surface area in thermal process reactor will reduce, and due toCan reduce by the obstruct heat transfer rate of sheet material, cause can not being fully subject in official hourThermal expansion or do not reach the expansion effect of expection, and most main engine plants are for energy-conservationThe requirement reducing discharging is more and more higher, and the needed thermal response temperature in automobile manufacturing process existsProgressively reduce, this is also a kind of test for traditional expanded material and design.
Summary of the invention
The object of the invention is to treat for existing expansion slab rubber the corner portion of sealed cavityPosition sealing halfway problem, provides a kind of cavity thorough seal to be sealed that can realizeExpansion slab rubber.
The technical scheme that solution the technology of the present invention problem adopts is a kind of expansion slab rubber, bagDraw together support and expanding material, described support and the shape of cavity to be sealed match;
Be provided with at least one for support being fixed on to cavity to be sealed at described supportFixture;
Be provided with outstanding support passage at described support periphery, described expanding material positionIn described support passage;
The central authorities of described support are provided with central baffle, and described fixture is arranged at central authoritiesOne side of dividing plate; Described support passage is arranged at the periphery of central baffle;
It is characterized in that, described expanding material is corresponding with the corner of cavity to be sealedPosition is ledge.
Expansion slab rubber of the present invention is by relative with the corner of cavity to be sealed by expanding materialThe position of answering arranges ledge, and expansion slab rubber and ledge expand all after being heatedTo external expansion, cavity to be sealed is comprised to corner part seals completely evenly.
Preferably, the distance of the inwall of described ledge and cavity to be sealed be 1～2mm。
Preferably, the one or both sides of the middle position of described central baffle are provided with and prop upFagging.
Described gripper shoe can confined expansion blob of viscose movement in the vertical and to be sealedCollecting together in cavity.
Preferably, described support passage internal interval is provided for fixed expansion materialFixed leg.
Preferably, described support passage is provided with draws material hole, and the described material hole of drawing is positioned atThe aperture of expanding material one side is less than the aperture of the opposite side that is positioned at support passage.
Above-mentioned fixed leg expects that with drawing hole, for restriction and fixing expanded material, prevents foamingMaterial departs from support before and after foaming.
Described support passage adopts L shaped; The bottom width of described L shaped support passageBe 4～8mm.
Described L shaped support passage is used for supporting stationary heat Expansion sealing material, stops heatExpansion sealing material departs from support in reflow process, ensures that thermal expansion encapsulant is sameFoam in one cross section.
Preferably, between described central baffle and described L shaped support passage, be provided withStep.
Described step is for preventing expanded material flash at injection moulding process.
Preferably, described support passage adopts T shape or U-shaped or C shape structure.
Preferably, described support is formed by thermoplastic synthetic material injection moulding, describedThermoplastic synthetic material is in polyamide, polyimides, PETGAny one;
Described expanding material comprise Polymers adhesive and blowing agent, wherein, poly-Compound based adhesive is the copolymerization of ethylene-vinyl acetate copolymer, ethylene-methyl acrylateThing, styrene and butadiene copolymer, styrene and isoprene copolymer, polyethyleneAny one in butyral, butadiene-styrene rubber, polybutadiene rubber.
Expansion slab rubber of the present invention can be realized the thorough sealing of the corner of cavity to be sealed,And the fixing before expansion and after expanding of the expansion slab rubber of realizing.
The object of the invention is, complex process high for existing expansion slab rubber manufacturing cost, inconvenient problem is installed, provide a kind of low cost, the simple manufacture method of technique,Installation method.
The technical scheme that solution the technology of the present invention problem adopts is a kind of system of expansion slab rubberStandby, installation method, comprise the steps:
(1) by support injection mo(u)lding; By quadric injection mould, expanding material is injected and molded in againSupport passage, forms expansion slab rubber; Or by double-shot moulding straight forming, form and expandBlob of viscose;
(2) expansion slab rubber is arranged to cavity to be sealed;
(3) at the temperature of 140～200 DEG C, baking 15～25min, carry out Expansion sealing.
Above-mentioned preparation, installation method can low costs, simply manufacture expansion slab rubber,Reduce the consumption of expanded material and timbering material, improved cavity structure corner portion simultaneouslyThe sealing property of position, has simplified the assembling mode of expansion slab rubber.
Brief description of the drawings
Fig. 1 be in the embodiment of the present invention 1 expansion slab rubber in the cavity of car body front deck positionPosition view.
Fig. 2 is expansion slab rubber support front schematic perspective view in the embodiment of the present invention 1.
Fig. 3 is expansion slab rubber cradle back schematic perspective view in the embodiment of the present invention 1.
Fig. 4 (a) is for putting for buckle and the ledge of expansion slab rubber in the embodiment of the present invention 1Front schematic perspective view after large.
Front in Fig. 4 (b) embodiment of the present invention 1 after expansion slab rubber injecting frothing material is verticalBody schematic diagram.
Fig. 5 is back side solid after expansion slab rubber injecting frothing material in the embodiment of the present invention 1Schematic diagram.
Fig. 6 (a) is that the master of expansion slab rubber in the embodiment of the present invention 1 looks schematic diagram.
Fig. 6 (b) is the generalized section along A-A line of Fig. 6 in the embodiment of the present invention 1 (a).
Fig. 7 (a) is the schematic top plan view of expansion slab rubber in the embodiment of the present invention 1.
Fig. 7 (b) is the generalized section along B-B line of Fig. 7 in the embodiment of the present invention 1 (a).
Fig. 7 (c) is the generalized section along C-C line of Fig. 7 in the embodiment of the present invention 1 (a).
Fig. 7 (d) and Fig. 7 (e) are for drawing two kinds of section signals in material hole in the embodiment of the present invention 1Figure.
Fig. 7 (f), Fig. 7 (g), Fig. 7 (h) are three kinds of support passage in the embodiment of the present invention 1Generalized section.
Fig. 8 (a) be in the embodiment of the present invention 1 expansion slab rubber in cavity, expand before stateSchematic top plan view.
Fig. 8 (b) is the generalized section along D-D line of Fig. 8 in the embodiment of the present invention 1 (a).
Fig. 9 (a) is state after the expansion of expansion slab rubber in cavity in the embodiment of the present invention 1Schematic top plan view.
Fig. 9 (b) is the generalized section along E-E line of Fig. 9 in the embodiment of the present invention 1 (a).
Wherein:
10. support; 11 central baffle .12. buckles; 12 '. buckle; 121. supporting surface; 122.Buckle body; 13. gripper shoes; 13 '. gripper shoe; 14. gripper shoes; 14 '. gripper shoe;15. fixed legs; 16. support passage; 17. steps; 18. draw material hole;
20. expanded materials; 21. strip expanded materials; 22. ledges; 23. ledges;24. ledges;
30. panel beatings;
40. panel beatings;
50. panel beatings.
Detailed description of the invention
For making those skilled in the art understand better technical scheme of the present invention, knot belowClosing the drawings and specific embodiments is described in further detail the present invention.
Embodiment 1
As shown in Fig. 1-9, a kind of expansion slab rubber provided by the present invention, comprises support 10And expanding material, support 10 matches with the shape of cavity to be sealed; Preferably, expandMaterial is the expanded material 20 of thermal expansion.
On support 10, be provided with at least one for support 10 and cavity be fixedFixture, preferred, fixture be buckle 12,12 '.
Be provided with outstanding support passage 16 at support 10 peripheries, expanded material 20 is positioned at and props upIn support passage 16. Preferably, support passage 16 is L shaped.
The central authorities of support 10 are provided with central baffle 11, and preferred, central baffle 11 is UShape. Preferably, central baffle 11 is flat structures. Preferably, in order to improve rigidity,Can in this central baffle 11, increase reinforcement or whole support 10 arches upward and is step shape.
Buckle 12,12 ' a be arranged at side of central baffle 11, this buckle 12,12 'Be used for expansion slab rubber to be fixed on the panel beating in the cavity that will seal, buckle 12,12 'It is the part of support 10.
Expanded material 20 is evenly continuously around support 10, by drawing material hole 18 and/or solidFixed column 15 is fixed on the surrounding of L shaped support passage 16, guarantees that expanded material 20 is being heatedBefore and after expanding, do not depart from support 10.
Expanded material 20 position corresponding with the corner of cavity to be sealed is ledge22,23,24, ledge 22,23,24 protrudes from width and height both directionExpanded material 20. This ledge 22,23,24 is for sealing the corner of cavity to be sealed.
Preferably, the material of support 10 can be formed by metal. Preferably, support 10Material also can adopt thermoplastic synthetic material. Preferably, can also close thermoplasticityBecome material to carry out glass enhancing and/or add toughening material. Thermoplastic synthetic material can beAny one in polyamide, polyimides, PETG. Preferably, select polyamide 66. The Polymers of the expanded material 20 of applicable heat-swellable is stickyMixture can being total to for ethylene-vinyl acetate copolymer (EVA), ethylene-methyl acrylatePolymers, styrene and butadiene or isoprene copolymer, polyvinyl butyral resin, fourthAny one in benzene rubber (SBR), polybutadiene rubber (BR). Preferably, can be hot swollenThe Polymers adhesive of swollen expanded material 20 is ethene-vinyl acetate copolymer. ToIn the Polymers adhesive of expanded material 20, add blowing agent. Expanded material 20 is heatedExpand, expand out along the open side both sides of L shaped support passage 16, thereby will prop upFrame 10 materials and panel beating wall couple together, and seal up cavity. Wherein thermoplastic synthetic materialShould there is the fusing point higher than the expansion temperature of expanded material.
Above-mentioned expanded material 20 in the time of injection moulding and the caking property of matrix material obtained carryingHeight, can reduce 16 upper fixed legs 15 of expanded material 20 support passage or draw material hole 18Quantity, reduce the complexity of mould; Improve expanded material 20 in foaming processCaking property, make it to there is good bonding force with support 10 bulk materials and metallic plate,Can reach 100% bonding, also can reduce manufacturing cost.
Above-mentioned expanded material 20 has higher foamed stability, and it can be in wider temperatureWithin the scope of degree, its expansion ratio keeps stable, so that expanded material 20 can be applied to vehicle bodyDiverse location.
The support passage 16 of the support 10 of expansion slab rubber and the cross sectional shape of expanded material 20Match with the cross sectional shape of corresponding cavity to be sealed (panel beating overlap joint forms), its cross section chiThe sectional dimension of the very little cavity to be sealed that is less than body of a motor car. In most cross section, send outThe distance of foam material and cavity wall to be sealed is 4～6mm; For the corner of cavity to be sealedPosition, the distance of expanded material and cavity wall to be sealed is 1～2mm.
Adopt this measure to ensure: all process liquids in automobile manufacturing process, such asDegreasing agent, bonderite etc., can unimpededly flow through the cavity of body of a motor car,And the inwall of these cavity elements can fully be infiltrated. Then in baker to can heatThe component of polymer expanding carries out thermal response, the expanded material 20 of heat-swellable laterally andLongitudinally above expand out from the support passage 16 of expansion slab rubber, and firmly and reliably attachedOn the inwall of cavity to be sealed, and then hardening by cooling. Thus, the sky of body of a motor carChamber is completely sealed, and the structural member wooden partition at support 10 and cavity to be sealed place is bonddCome, thereby seal up whole cavity.
Preferably, as Fig. 1 illustrates the position of expansion slab rubber on body of a motor car, at automobileIn vehicle body, can see the cavity that will seal in front apron upper cavity (if vehicle body has thisPlant structure), left side, enging cabin rear portion and right side, pack expansion slab rubber into respectively this districtIn the cavity in territory, for stopping that engine noise and thermal current are by panel beating gap, cavityImport in driver's cabin, thereby improve noise level in car and the refrigeration of air-conditioning. ExcellentChoosing, the cavity that also expansion slab rubber of the above-mentioned type can be positioned over to body of a motor car comprises carA post top, A post bottom, B post middle part or the bottom of body, C post, threshold, trailing wheelThe positions such as cover. Preferably, also the expansion slab rubber of the above-mentioned type can be positioned over car bottom girder,Front longitudinal, fender bracket cavity etc.
As shown in Figures 2 and 3, according to the central baffle 11 of different cavity structures andSize difference between support passage 16. Wherein, the thickness of central baffle 11 can according to everyVolume need to carry out the design of different-thickness, but for the consideration of cost and weight, oneAs be selected in 1.0～4.0mm, be 1.5～3mm preferably, can meet the need of oise insulation factorAsk.
Preferably, as shown in Fig. 4 (a) and Fig. 4 (b), in central baffle 11, arrange two admittedlyDetermine part: buckle 12,12 ', each buckle 12,12 ' by buckle body 122 and cardButton supporting surface 121 forms, according to the different-thickness of installed panel beating, and buckle body 122Card base place and supporting surface 121 leave gap, are generally and ensure to install, card base Gap-Ratios metal plateGold thickness has more 0.2～0.5mm, is 0.3mm preferably, and this gap can ensure by twoIndividual buckle 12,12 ' blob of viscose is fixedly mounted on panel beating preferably, and be unlikely to install itRear generation is rocked more greatly and is rotated.
Preferably, as shown in Figure 2, also can arrange in the middle position of central baffle 11Have two gripper shoes 14 and 14 ', these two gripper shoes 14,14 ' with supporting surface 121In the horizontal direction in sustained height, expansion slab rubber is installed rear bearing sheet 14,14 ' canProp up panel beating face, the movement in the vertical of restriction blob of viscose. Preferably, also can supportThe outer of passage 16 arrange two other gripper shoe 13 and 13 ', these two gripper shoes 13,13 ' after installing, expansion slab rubber can prop up cavity structure wooden partition, exist thereby can limit blob of viscoseCollecting together in cavity. Therefore by buckle 12,12 ' and gripper shoe 13,13 ', 14,14 ' expansion slab rubber can be securely fixed in to the precalculated position in cavity.
With the installing hole of the panel beating of buckle 12,12 ' be interlocked, its shape and bayonet socket are mutuallyJoin. For only have a buckle 12,12 ' situation under the shape and bayonet socket phase of installing holeMate very importantly, be directly connected to fixing reliability. Plural for havingBuckle 12,12 ' expansion slab rubber, the shape of installing hole is not key especially, shapeCan be square, circle, rectangle, polygon, ellipse or other are irregularShape, as long as it can receive fixing buckle and expansion slab rubber is fixed on to required positionPut. Preferably, expansion slab rubber is arranged in cavity, central baffle 11 is tiedThe plane that structure limits is substantially perpendicular to the longitudinal axis of body upright post or other hollow structure member.The required installing hole of expansion slab rubber of the present embodiment is two circular ports, and aperture is 6mm.
Preferably, logical in the L shaped support continuous, that arrange around ground of central baffle 11 surroundingsRoad 16. As shown in Fig. 4 (b) and Fig. 5, this L shaped support passage 16 hold be bar shaped canThe expanded material 20 of thermal expansion, the width of support passage 16 bottom surfaces is generally set in 4～8mm. Preferably, the width of support passage 16 bottom surfaces is 5～6mm. Preferably, send outThe width of foam material 20 equals the width of support passage 16 bottom surfaces, and this size is by foaming materialThe expansion multiplying power of material 20 and expanded material 20 determine with the spacing of panel beating wall. Term is " wideDegree " in whole application, use, for representing that expanded material 20 is in support passage 16Size, this size is in the plane of support passage 16.
If there is no fixed structure, forming in the process of foam because the nothing of foamed material ownSupporting force, because its meeting after expanded material 20 meltings of Action of Gravity Field event is sagging, and sends outThere is internal stress in foam material 20, thereby when causing foaming, expand adhesive tape in expansion processTorsional deformation, departs from support passage 16. In the time of the axis approximate horizontal of the cavity that will seal,This problem is especially serious, the substantially vertical placement of expanded material 20 (it is perpendicular to cavity axis),And sagging trend limit foam is to the expansion on cavity wall top, result, sealing may be notComplete. Therefore use relatively large expanded material 20 in order to ensure enough sealings, thisAlso weight and the cost of sealing have been increased. When the cavity cross section that will seal be irregular orWhile having some sharp-pointed acute angles, this problem is particularly serious. Thereby expanded material 20 needsSome supportings, fixed structure limit above-mentioned defect.
Preferably, as shown in Figure 2, expansion slab rubber is equal in the centre position of support passage 16The fixed leg 15 of some is enclosed in even distribution one, for restriction and fixing expanded material 20,Prevent that expanded material 20 from departing from support 10 before and after foaming, particularly for vertical placementThis structure of expansion slab rubber seems particularly important.
Preferably, also can take Fig. 7 (d) and Fig. 7 (e) for the fixed form of expanded material 20Hole 18 is expected in shown drawing, and also can mix the above-mentioned several modes that adopt. For Fig. 7 (d) instituteThat shows draws material hole 18, and Kong center is in the central authorities of L shaped support passage 16, and is positioned at and sends outIt is little that the aperture ratio of alveolar layer is positioned at the aperture of opposite side of support passage 16, and hole is coniform knotStructure, the cone angle of circular cone is 20～60 °, is 25～45 ° preferably, foaming layer one side openingDiameter is 1.5～4mm, is 2.5～3.5mm preferably, can be comparatively by this kind of methodWell expanded material 20 is fixed in support passage 16. Shown in Fig. 7 (e) is in additionOne is drawn material hole 18, this kind draw material hole 18 structure relative complex some, need to support logicalThe opposite side in road 16 plays the boss of some, and the Circularhole diameter ratio on boss is positioned at supportThe slightly larger in diameter in hole on passage 16 is 3～6mm. Certainly also can adopt other irregularHole 18 is expected in drawing of shape, as rectangle, square, Long Circle, polygon etc.
Preferably, as shown in Figure 2, L shaped support passage 16 and central baffle 11 itBetween be provided with a stair-stepping structural ledge 17, this step 17 can limit expanded material20 expansion direction, can prevent expanded material 20 flashes in quadric injection mould process simultaneously,Thereby affect the presentation quality of expansion slab rubber. The width of whole step surface is 0.5～2mm,Be 0.8～1.5mm preferably.
Preferably, as shown in Fig. 7 (f), support passage can be also T shape, and T shape is supportedPassage itself also can be used as the fixed structure of expanded material 20. T shape support passage can changeThe directionality of kind expanded material 20, expanded material 20 in the process of expanded by heating, bodyLong-pending variation can be expanded by certain direction, and in expansion process gravitateLess, be specially adapted to the expansion slab rubber of horizontal device, its expanded material 20 support passage16 cross sections are T shape structure, therefore greatly the complexity of simplified design and reduce mouldManufacturing cost.
Preferably, support passage can be also C shape support passage or the figure shown in Fig. 7 (g)U-shaped support passage shown in 7 (h), these two kinds of structures can surround expanded material 20 at three faces,Thereby expanded material 20 can only radially preferentially expand. But made according to figure by injection mouldingAlso there is certain shortcoming in the expansion slab rubber of 4 (b), such as moulding injection mold needs removableSlide block structure, slide block occupies C shape during timbering material is injected to mould or U-shaped props upThe inner chamber of support passage. For the demoulding, must be along the horizontal direction of central baffle 11 by theseSlide block is removed so far, and the segment space that its slide block occupies mould causes plastic partsSpace diminish, thereby increased die cost, cost per unit also increases thereupon simultaneously,Reduce production efficiency. And employing sandwich structure, because expanded material 20 is clipped in twoBetween thermoplastic sheet, form three bread and cover, in thermal process reactor, heating surface area will for itReduce, and because the obstruct heat transfer rate that is subject to gripper shoe can reduce, cause regulation timeIn abundant expanded by heating or do not reach the expansion effect of expection.
Preferably, above-mentioned support 10 can be manufactured inexpensively by injection moulding process, itsIn, in first step, by thermoplastic is expelled among injection mold, and makeBecome by central baffle 11, buckle 12,12 ', L shaped support passage 16 integral typesFrame 10. In knockout course along make injection mold perpendicular to the direction of central baffle 11Two moulding half parts pull open mutually. Then in second step, at the second suitable noteIn mould, the expanded material of heat-swellable 20 is poured in L shaped support passage 16.In this second job step, carry out the demoulding equally, the demoulding equally along perpendicular to central authorities everyThe direction of plate 11, forms expansion slab rubber after the demoulding, as Fig. 4 (b), Fig. 5, Fig. 6 (a) andShown in Fig. 7 (a).
As shown in Fig. 6 (b), the section of expansion slab rubber is U-shaped, strip expanded material 21Be fixed on the two ends of U-shaped structure, have outstanding position at position, three corners expanded material 2022,23,24. The width of expanded material 20 is generally set in 4～8mm, is preferably5～6mm, the size in expanded material 20 cross sections by the expansion multiplying power of expanded material 20 andExpanded material 20 determines with the spacing of panel beating wall. Because carry out at foamable material 20Activate in the process of blowing agent, the expanded material 20 of heat-swellable not only can be desiredRadial direction expands with the space between sealed support 10 and cavity wall, Er QieyouVery most of plane perpendicular to central baffle 11 is in the open side of L shaped support passage 16Expand, moreover fixed leg 15 or draw material hole 18 also can to foaming produce certain influence,This means, set the size of expanded material 20 and be must consider this and unwished-forExpansion. Expanded material 20 for expansion multiplying power more than 800%, expanded material 20Thickness is 3～10mm, is 4～8mm preferably. Thickness is used for representing expanded material 20Size between outer surface and support passage 16 inner surfaces, this size is perpendicular to support passage16 planes.
Due to the panel beating overlap joint that cavity structure adopts, inevitably there is position, corner,The filling sealing at these positions is relevant with the filling capacity of material, and these positions are not oftenCan seal fully, as shown in Fig. 7 (a), Fig. 7 (b) and 7 (c), expanded material 20Adopt outstanding structure 22,23,24, preferred, the section of outstanding structure 22,23,24Be shaped as polygon, the size of its top and support passage 16 inner surfaces is greater than expanded material20 thickness.
Then, above-mentioned expansion slab rubber is installed in the cavity to be sealed of body of a motor car,As the position of illustrating in Fig. 1, by the central baffle of expansion slab rubber 11 perpendicular to sky to be sealedThe longitudinal axis in chamber is arranged.
As Fig. 8 (a) with (b), the sky that expansion slab rubber forms at panel beating 30,40,50Form in chamber, it should be noted that the distance of the profile and the panel beating that are not expanding materialConsistent, as previously mentioned in order to ensure the sealing at position, corner, expanding material and panel beatingSubstantially be fit-state, but this does not affect the electrophoretic effects of panel beating. Conventionally utilize negative electrodeThe baking process of electrophoretic coating sclerosis activates expandable material and makes it and expands, and conventionally addsHeat condition is 140～200 DEG C, and the time is 15～25min. Expanding material is after being heatedExpand and to external expansion, support 10 and panel beating wall are coupled together equably, thereby block wholeIndividual cross section.
As shown in figure Fig. 9 (a) and Fig. 9 (b), the banded expanded material 20 of heat-swellable is in footpathL shaped support passage 16 upwards expands out, and is attached to securely cavity to be sealedInwall on, and then hardened forming, forms uniform foam, little with little sealingUnit. Thus, the described cavity of body of a motor car is completely sealed.
Embodiment 2
The present embodiment provides a kind of preparation, installation method of expansion slab rubber, comprises following stepRapid:
Preferably, in first step in the demoulding perpendicular to mobile moulding half partsDirection is expelled to thermoplastic among injection mold, makes by central baffle 11 cardButton 12,12 ', the support 10 of L shaped support passage 16 integral types. After cooling by support10 demouldings, in knockout course along making injection mold perpendicular to the direction of central baffle 11Two moulding half parts mutually pull open;
In the second injection mold, the expanded material of heat-swellable 20 is poured into L shapedOn support passage 16. In this second job step, carry out the demoulding equally, the demoulding equally alongPerpendicular to the direction of central baffle 11, after the demoulding, form expansion slab rubber, as Fig. 4 (a), figure5, shown in Fig. 6 (a) and Fig. 7 (a).
Certainly, above-mentioned first step can pass through double-shot moulding straight forming, forms and expandsBlob of viscose.
Can manufacture inexpensively by injection moulding process by above-mentioned steps support 10.
Then in second step, by the central baffle of expansion slab rubber perpendicular to sky to be sealedThe longitudinal axis in chamber is arranged expansion slab rubber, position as shown in Figure 1.
The present invention is except being applied to automotive front baffle plate upper cavity structure, also applicable vapourCar vehicle body typical case cavity have vehicle body A post top, A post bottom, B post middle part or bottom,The positions such as C post, threshold, rear wheel cover. Other cavity that need to seal have car bottom girder,Front longitudinal, fender bracket 10 cavitys etc.
Preferably, then, in third step, utilize the baker of ability cathode electrophoresis japanning sclerosisBaking process activate expandable material and make it expand, heating-up temperature is 140～200DEG C, the time is 15～25min. Thermal expansion encapsulant after being heated, expand equably toExternal expansion couples together support and panel beating wall, can effectively the cavity at this place be supported logicalRoad 16 intercepts, and reaches totally-enclosed, thereby prevents dust, water, air and other nuisanceMatter is invaded, and stops the noise importing into through vehicle body space, reaches further and improvesThe object of vibration isolation in car passenger cabin, sound insulation, vibration damping, noise reduction, makes the NVH of automobileBe improved.
Be understandable that, above embodiment is only used to illustrate principle of the present inventionAnd the illustrative embodiments adopting, but the present invention is not limited thereto. For abilityThose of ordinary skill in territory, in the situation that does not depart from spirit of the present invention and essenceUnder, can make various modification and improvement, these modification and improvement are also considered as of the present inventionProtection domain.
Claims (9)
1. an expansion slab rubber, comprises support and expanding material, described support with treat closeThe shape of envelope cavity matches;
Be provided with at least one for support being fixed on to cavity to be sealed at described supportFixture;
Be provided with outstanding support passage at described support periphery, described expanding material positionIn described support passage;
The central authorities of described support are provided with central baffle, and described fixture is arranged at central authoritiesOne side of dividing plate; Described support passage is arranged at the periphery of central baffle;
It is characterized in that, described expanding material is corresponding with the corner of cavity to be sealedPosition is ledge;
Described fixture is for expansion slab rubber being fixed on to the panel beating in cavity to be sealedBuckle, in described central baffle, be furnished with two buckles, each buckle comprise buckle thisBody and buckle supporting surface, card base place and the supporting surface of buckle body leave gap, described betweenGap has more 0.2～0.5mm than panel beating thickness;
Be furnished with two in the middle position of central baffle for propping up first of panel beating faceFagging, the supporting surface of two gripper shoes and buckle is in the horizontal direction in sustained height;
Be furnished with two in the outer of support passage for propping up cavity structure wooden partition to be sealedThe second gripper shoe.
2. expansion slab rubber as claimed in claim 1, is characterized in that, described is outstandingPart is 1～2mm with the distance of the inwall of cavity to be sealed.
3. expansion slab rubber as claimed in claim 1, is characterized in that, described supportChannel interior interval is provided for the fixed leg of fixed expansion material.
4. expansion slab rubber as claimed in claim 1, is characterized in that, described supportPassage is provided with and draws material hole, and the described aperture of drawing material hole to be positioned at expanding material one side is less than positionIn the aperture of the opposite side of support passage.
5. expansion slab rubber as claimed in claim 1, is characterized in that, described supportPassage adopts L shaped; The bottom width of L shaped support passage is 4～8mm.
6. expansion slab rubber as claimed in claim 5, is characterized in that, described central authoritiesBetween dividing plate and described L shaped support passage, be provided with step.
7. expansion slab rubber as claimed in claim 1, is characterized in that, described supportPassage adopts T shape or U-shaped or C shape structure.
8. expansion slab rubber as claimed in claim 1, is characterized in that, described supportFormed by thermoplastic synthetic material injection moulding, described thermoplastic synthetic material be polyamide,Any one in polyimides, PETG;
Described expanding material comprise Polymers adhesive and blowing agent, wherein, poly-Compound based adhesive is the copolymerization of ethylene-vinyl acetate copolymer, ethylene-methyl acrylateThing, styrene and butadiene copolymer, styrene and isoprene copolymer, polyethyleneAny one in butyral, butadiene-styrene rubber, polybutadiene rubber.
9. preparation, the installation method of the expansion slab rubber as described in as arbitrary in claim 1-8, itsBe characterised in that, comprise the steps:
(1) by support injection mo(u)lding; By quadric injection mould, expanding material is injected and molded in againSupport passage, forms expansion slab rubber; Or by double-shot moulding straight forming, form and expandBlob of viscose;
(2) expansion slab rubber is arranged to cavity to be sealed, wherein, by central baffleBuckle is fixed on expansion slab rubber on the panel beating in chamber to be sealed, by central baffle central authorities positionFirst gripper shoe of putting props up described panel beating face, and by second on the outer of support passageGripper shoe props up cavity configuration wooden partition to be sealed;
(3) at the temperature of 140～200 DEG C, baking 15～25min, carry out Expansion sealing.
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| EP2804394B1 (en) * | 2013-05-17 | 2018-08-08 | Harman Becker Automotive Systems GmbH | Method for mounting a loudspeaker carrier in a vehicle and corresponding loudspeaker assembly |
| CN103552518B (en) * | 2013-10-12 | 2016-01-13 | 奇瑞汽车股份有限公司 | A kind of preforming sound insulation blob of viscose and installation method thereof |
| CN104627089B (en) * | 2015-01-13 | 2017-01-25 | 奇瑞汽车股份有限公司 | Sealing device for car body cavity |
| CN104908819B (en) * | 2015-06-03 | 2020-08-04 | 奇瑞汽车股份有限公司 | Noise reduction structure for vehicle body sheet metal part cavity |
| CN106542001B (en) * | 2015-09-18 | 2019-09-20 | 北京宝沃汽车有限公司 | The mounting structure of fender |
| CN110356338A (en) * | 2019-07-26 | 2019-10-22 | 奇瑞商用车（安徽）有限公司 | A kind of new energy vehicle cavity denoising structure and its assembling expanding method |
| CN112213478B (en) * | 2020-10-26 | 2022-07-08 | 奇瑞汽车股份有限公司 | Device and method for testing bridging performance of sound insulation rubber block foaming material |
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| US6413611B1 (en) * | 2000-05-01 | 2002-07-02 | Sika Corporation | Baffle and reinforcement assembly |
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| CN1296451A (en) * | 1998-01-26 | 2001-05-23 | 泰科电子有限公司 | Cavity sealing article and method |
| CN101678796A (en) * | 2007-03-28 | 2010-03-24 | 汉高两合股份公司 | Sound-absorbing baffle for sealing a hollow space |
| CN201842036U (en) * | 2010-10-29 | 2011-05-25 | 上海子元汽车零部件有限公司 | Joint connection sound insulation block for cavity of vehicle body |
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