The Effects Of The Resin Layer Of Such Material To The Formability As Well As The Forming Defects Are Depicted.
Its Current Applications In The Automotive Industry Are Also Summarized.
The rapid development of foreword automobile industry, taller and taller also to the requirement of environmental protection, safety and comfortable sex. Noise and vibration regard a car as one of main index of function, make the task that each leader plant pays close attention to. The component that noise and vibration damage a car not only, lower car life, and the health that endangers a passenger and safety. It is those who raise a car to fall a confusion of voices and decrease brace up level, on the car used all sorts of vibration extensively already to control a technology, among them damp is decreased brace up it is the method with a kind of apparent effect. One of current main methods are stickup on component decrease brace up damp piece decrease in order to achieve brace up fall the purpose of a confusion of voices, but the addition that also caused spare parts weight from this. Compound decrease brace up board as a kind new-style damp is decreased brace up the attention that material caused a trade gradually. Compound decrease brace up board it is a kind of when comprise by common armor plate and high polymer polymer new-style damp is decreased brace up material, in assure intensity and stiffness while, can achieve decrease brace up fall the purpose of a confusion of voices, decrease decrease brace up spare parts amount is contented what increase increasingly is light quantify demand. Because this is compound decrease brace up board serve as a kind not to increase to measure and be achieved again decrease brace up fall the new-style material of effect of a confusion of voices, make the way of a development of car application. If figuration function is reached,decrease to the research of this material brace up the research of function more and more be taken seriously, also get wider and wider attention in the application of automobile industry. Compound decrease brace up board material and structure are complex decrease brace up board classification is compound decrease brace up board have a tie normally model with blame tie model, and structure of the tie that what the article studies is a kind of model damp. Tie damp structure is to be below the condition that assures intensity and stiffness, rise as far as possible decrease brace up the effect. Compound decrease brace up board according to different and applicable demand and structure, divide roughly it is a few kinds as follows: From damp decorate formal branch: Have three-layer damp and multilayer damp; Distributing symmetrically and asymmetrical decorate a form. From cent of damp layer ply: Have structure of layer of damp of thin with filling and structure of layer of damp of thick with filling. What the article studies is damp of three-layer of thin with filling is decreased brace up board. Typical structure is the most current compound decrease brace up board it is by the symmetrical common armor plate of fluctuation and the high polymer among colophony is comprised, intermediate layer is restrained by fluctuation substrate, form tie damp structure, if pursue,1 is shown. Intermediate layer is the high polymer colophony that has higher loss factor, like polyester (PE) , polypropylene (PP) , nylon (NY) reach get together Xi of 3 methylic the fifth of the ten Heavenly Stem (TXP) etc. The ply of substrate is commonly 0.
6 Mm, the ply of intermediate layer is commonly 0.
1 Mm. Common armor plate offers intensity and stiffness, the layer can absorb intermediate high polymer vibration and noise. Graph 1 compound decrease brace up board structural sketch map is decreased brace up principle damp material is alleged damp material, point to the material of high polymer viscoelasticity of area of temperature of vitreous state transition and coincide of use temperature photograph namely. Polymer is measured in the model when vitreous condition very tall, molecular barely moves, hard loss energy. And when polymer is accusing state high, molecular movement is light, draw enough mechanical energy not easily. Outside sufferring when vitreous condition when polymer master piece uses generation when cycle is out of shape, force molecular catenary paragraph produce opposite displacement, carry a member between inside attrition, change is heat energy and waste the mechanical energy of one part, remove damp to decrease display vigour to use thereby. Compound decrease brace up board draw energy through having the damp layer of high loss factor namely and achieve decrease brace up fall the purpose of a confusion of voices, and its are applicable intensity and applicable temperature depend on high polymer shear strength and factor of the biggest loss. The loss factor of damp layer changes as the change of temperature, if the graph is shown 2 times, compound decrease brace up board area of optimal use temperature is to be in area of temperature of vitreous state transition. Graph the relation Nextpage of sex of nit of block of 2 different colophony and temperature is decreased brace up principle basis mechanical vibration is academic, rigid structure system is in stimulate brace up below strength effect, when the natural frequency of incentive frequency and structural system is same will syntonic phenomenon happens, systematic damp is exclusive and OK decrease brace up element. Damp is decreased brace up rely on rigid structure damp namely (material damp, structure damp, contact damp) will oscillatory change is heat energy, achieve thereby decrease brace up purpose. Stretch material can store energy, do not have the function of disappear energy consumption however, agglutinant material does not have memory function but can consume energy. Viscoelasticity material is the stuff of high polymer polymer that one kind has certain and agglutinant liquid already and has stretch solid character at the same time, have both quality, can store already energy, energy of caustic of specific power consumption, namely the action of oscillatory damp. The function index that measures material damp effect is factor of structural damp loss, loss factor is bigger its damp effect is more distinct, to great majority material, factor of structural damp loss is roughly 0.
1, factor of osculatory damp loss is roughly commonly 0.
05. One of effective methods that raise material damp are the union that accuses damp material and metallic construction material through will be being stuck, make its loss factor is achieved 0.
5, can raise the damp of the spare parts significantly thereby. Compound decrease brace up board because figuration sex and figuration blemish are compound decrease brace up harden compose is different from common armor plate, its figuration function has remarkable distinction. Normally, compound decrease brace up board figuration sex and damp layer have affinity, include the ply of damp layer, the bonding strength of intermediate binder, shear strength is right compound decrease brace up board figuration sex, corrugate, spring back, delamination produces an effect. The influence of damp layer is compound decrease brace up board the function of figuration function and intermediate damp layer reachs his to be out of shape the circumstance is relevant, the function of intermediate damp layer rather ply, be out of shape of around deposit time and working temperature closely related. In canister form in the experiment, as the addition of intermediate damp layer, the sample deepness when sample craze is reduced. Because the addition of intermediate layer reduced the cutting between the interface,this is stress, cause its figuration function to be reduced along with the addition of interlining ply thereby. The shear strength of binder is right compound decrease brace up board figuration function also has apparent effect, research shows the thin stencil steel to different binder is inside certain limits, as the addition of shear strength, cupping value increases. When shear strength achieves 13MPa, answer plywood cupping value and common board cupping value is adjacent. After bend test, deposit time to also have certain effect to the spring back of the spare parts after figuration. Through V form bend test makes clear spring back to horn increases as what deposit time and be reduced gradually, until tend stable. Accordingly, compound decrease brace up board figuration have certain time lag sex. Figuration blemish each mechanical function (especially damp layer) , the interface sticks the ply scale that accepts intensity and each to be opposite the blemish in figuration produces an effect. Compound decrease brace up board the commonnest in figuration process flaw, if layer of degum, slippage, amlposition, damp is destroyed,reach warp to wait. The mechanical performance as a result of damp layer is general under common armor plate, intermediate layer is compound decrease brace up board the weak point in figuration process, produce limitation more easily. In figuration process, intermediate layer produces bigger cutting to be out of shape commonly. Cutting be no longer in force is intermediate layer produces destructive main reason. Document experiments to cut be no longer in force with what bend test confirmed intermediate layer at 4 o'clock through pulling a turn respectively is intermediate layer produces destructive main form. Compound decrease brace up board figuration problem has afore-mentioned drawback not only, still have the microcosmic be no longer in force of damp layer. Invalidation of microcosmic damp layer is brought about compound decrease brace up board decrease brace up function is reduced, sound insulation effect drops. Because damp layer invalidation is right,structural intensity, stiffness does not have an influence almost, be discovered not easily accordingly. Because the function of high polymer is followed,the microcosmic invalidation of intermediate damp layer basically is be out of shape time produces acuteness change with the change of temperature. Study the current situation domestic and internationally 20 centuries 80 time, colophony is compound decrease brace up board begin to appear, the developed country such as the United States, Germany, Japan begins to undertake study to colophony answer plywood. Y.
The person such as Yutori experiments through basic take shape, introduced to decrease brace up board mechanical function and figuration sex, undertook contrast with the armor plate that waits for ply. M.
The person research colophony such as Yoshida is compound decrease brace up board bent to point out and confirm decrease brace up board can appear to bend reversely when bend, namely " gull ala " phenomenon. The person such as Makinouchi applies three-layer model earlier to be opposite decrease brace up board figuration undertook imitate, forecasted the position of the blemish in figuration process. Kopp and Abratis are passed a series of experiment, discussed decrease brace up board spring back horn relatively the spring back part that waits for ply armor plate is small, decrease brace up board figuration limit pursues under wait for ply common armor plate. Cheng, H.
Waited for a person to consider to decrease brace up board corrugate trend, decrease brace up board fight corrugate ability stronger. The person such as Corona reachs through experiment and numeric simulative method course pressing is decreased curvedly brace up board retrorse angle of bend follows both wings the addition of drift journey and reduce, at the same time retrorse angle of bend lets time till,reduce gradually changeless. Liu.
Wait for a person to use simulation of Abaqus business software two kinds differ of intermediate layer globose pull deep, the property that studied each and decrease brace up board the relation of figuration sex. Current, research content of abroad is rich and detailed, drove compound decrease brace up board apply in the industry such as car, building and electron. Be in Japan especially, colophony is compound decrease Zhen Gang board to apply the floor at gymnasium, ceiling and postbag extensively already to transmit slideway to go up. The application on the car is decreased brace up board go up in the base that retains original intensity, stiffness, have the exceedingly good damp that waits for ply armor plate to be not had to decrease brace up characteristic. Compound decrease brace up board have structural effect not only, have more decrease brace up function, can reduce sound insulation sound-absorbing accessory, the function arrives since light quantify. From 20 centuries 90 time, colophony is compound decrease Zhen Gang board to begin to be used the car punch component at the part successfully by the wide attention of the developed country. Current, decrease Zhen Gang board to apply on foreign model more, and the craft of its component and technology are quite mature already, especially Japan, United States already realized dimensions to turn production. Decrease in home brace up application still is in start level, get applied in partial component only, and application still is restricted certainly. On the car, decrease Zhen Gang board to basically apply at oily base case, engine cover lid, when on the component such as cover of bracket of lid of cover of gear lid, crankshaft, box, water pump, rocker, dashboard, bottom and wheelhouse. Express 1 it is the application that decreases Zhen Gang board to go up in brand of a few cars. Great Wall Motor Corporation also begins to will decrease Zhen Gang board to apply at a few component, graph the 3 Great Walls that are trial-produce success the front wall of some model board. Graph 3 Great Walls the front wall of some model hardens language is complex decrease brace up board be comprise by damp material and common armor plate " sandwich " structural material, it has the intensity that waits for large board, stiffness not only, have more decrease brace up, fall the character of a confusion of voices, it is a kind of environmental protection, energy-saving new-style material. As a result of compound decrease brace up board unique structure, right compound decrease brace up board function of figuration of material and craft character if, emulation imitate still lie primary level, restricted thereby compound decrease brace up board a large number of application. As the flying development of automobile industry, to compound decrease brace up board research is ceaseless and thorough, compound decrease brace up board will receive wider application surely. CNC Milling