Reaction inject shapes (the application that RIM) enhances a technology to go up in the car

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In recent years, reaction inject shapes (Reaction Injection Molding, abbreviation " RIM " ) craft invests cost with its the characteristic with low, producer quick style and in car component got applied extensively in production. Regard RIM as the necessary complement of craft, RIM enhances a technology to pass polyurethane matrix is as compound as what enhance material, carried the main good point of RIM craft not only, still improved the thermal stability of material, intensity and other and mechanical performance at the same time, accordingly from 20 centuries since 80 time, RIM enhanced a technology to receive rapid development and wide application in automobile manufacturing industry. RIM enhances a technology to include to enhance reaction inject to shape technology (Reinforced Reaction Injection Molding, abbreviation " RRIM " ) react with the structure inject shapes (Structural Reaction Injection Moulding, abbreviation " SRIM " ) technology. RRIM is to use high-pressured concussion to make stock of two kinds of monomer and short staple enhance material to be able to mix, mixture material fashions product after reacting via fast solidify inside modular antrum. SRIM is called again mat enhance reaction inject to shape, its shape the characteristic is, the blame that comprises by fibre glass random on the matting inside preexistence mould braids felt, shape with reaction inject again craft inject stock gets product. With common buildup reaction inject shapes craft photograph is compared, the characteristic of SRIM craft is fiber grows, fill up the amount is large, can be as high as 60 ％ ～ commonly 70 ％ , it is better to enhance the result accordingly, apply to the production of car structural member. RRIM craft characteristic normally, the raw material that RRIM craft place uses includes two kinds to resinite is fastened and enhance material. Among them, using most colophony data is colophony of not polyurethane, saturated polyester and epoxy resin. In the car on plastic spare parts, ester of You Yiju ammonia is most common. Polyurethane is by get together two constituent comprise ether and ester of different cyanic acid, these two constituent all are liquid state below normal temperature, they are to pass metric pump or metric crock to come metric with what carry. Commonly used buildup material has ash of pink of micaceous, fibre glass, silica, glass small bead, vitriolic barium. Normally, enhance material and resinous to stick for improvement receive strength, need is used enhance afore-mentioned coupling agent is right buildup material undertakes finishing. Add in colophony group share to will enhance material, need uses mixture equipment to make they get mixture adequately. It is normally part two kinds of material metric good, put them a recipient next inside, via the agitate of proper time, make enhance material and colophony to obtain good mixture position. It is certain to should be added proportional after enhancing material, the viscosity of raw material is raised greatly, abrasiveness also increases significantly, if use maximum pressure,right now metric pump undertakes machining, probable meeting makes inside cutty time its damage. General, need uses the metric jar that passes via sclerosis, and mix a head also need to pass special sclerotic processing. The fluidity that sketch map of craft of graph 1 RRIM expects to carry highland, improve the performance full a pattern of the product, it is certain to can be added in raw material proportional compress gas, wait like nitrogen, carbon dioxide or air, after making raw material is in mould be goinged to by infuse thereby, can use aeriform pressure release auxiliary raw material to charge a pattern, obtain the products with higher quality finally. Here, uses gas-flushing device is called a nucleus to convert plant. Opposite at common RIM craft, the pattern that uses in RRIM craft often has the pressure inside higher standard, because material of this RRIM mould must have taller hardness, in order to ensure the service life of the mould. In general, use RRIM craft to produce goods to have following characteristics: ● products plan freedom is spent big, can produce large size part; ● shapes pressure is low (0.

35 ～ 0.

7MPa) , the pressure that compares the technology that note model is a lot of lower; ● reacts modular internal stress is not had when shaping; ● is joined as what enhance material, the wearability of goods and hear resistance are attainable rise; The shrinkage of ● goods is low, dimension stability is good; Quality of ● goods surface is good, can undertake online spray paint. Be based on afore-mentioned characteristics, make the part of automobile body exterior trim that uses RRIM craft to make has sufficient latent capacity to replace metallic spare parts, and use face is in gradually grow in quantity. The raw material that place of craft of SRIM of SRIM craft characteristic uses is the polyurethane material of double group share more, its enhance material basically is fibre glass felt, the kind that carries hot pressing shapes or it shapes beforehand. Because use fibre glass felt to regard as,enhance material, because this SRIM craft is beardless,add in colophony material enhance material, the RIM that the device that its use remains a standard is metric mixture equipment, use maximum pressure namely the high pressure of metric pump is pouring machine. Of fibre glass felt shape to use hot pressing to shape beforehand equipment. Normally, the SRIM goods that increases via fibre glass felt can gain greater mechanical strength, make because of this SRIM craft is used morely at car structural member make, for example framework of clothes tree, dashboard, door plank framework. Because the production cost of its mould is relative inferior, because this is in,batch applies relative to lesser circumstance more. General, the product that introduces SRIM craft production has the major characteristic of afore-mentioned RRIM goods, if shape pressure is low, the shrinkage of goods is low. But, as a result of the existence of fibre glass felt, the surface of goods is compared commonly coarse, cannot use at the exterior on. The crock type with graph commonly used 2 RRIM is metric reach mixture equipment Nextpage to use case 2001 metaphase, development of general motors company went a kind new-style be called " Protec " 6.

5ft (1ft=30.

48cm) railroad car of long RIM composite material and system of car end door, regard Chevrolet Silverado Pi Ka as the car select a replacement. With traditional adoption hot pressing shapes what the place of steeliness railroad car of plastic liner differs is, unit of whole Protec railroad car is made with composite material. Among them, the dashboard in railroad car and shell plating of car end door all used RRIM to the technology is made and be become, uses buildup material is mica. In addition, odd a railroad car of type and inside of car end door are to use 50 ％ to grow Bo fine to enhance polyurethane (SRIM) composite material is made and become. In railroad car and interior of car end door, return spray of a black " splash shoot lacquer " , make component appearance acquired the exterior grain of shape of tough, granule thereby, have at the same time fight ultraviolet function. According to introducing, after using SRIM and RRIM composite material, make truckload weight was reduced make an appointment with 50lb (1lb=0.

4536kg) , only car end door is lighter than steeliness product 15lb. 2004, general motors company is on its DENALI Pi Ka, used the dashboard that makes by RRIM craft, allegedly relative to the dashboard at SMC material character, its weight was reduced 30% ; Relative to at metallic dashboard character, its weight was reduced 50% . In addition, the dashboard of the car of German masses CROSS POLO that producing in Europe at present also uses RRIM craft production. Dashboard of German popular CROSS POLO is in the Europe edition model such as the GOLF A5 of masses Motor Corporation and TOURAN, there is part of sound insulation of a layer between engine cabin and automobile body, call front wall sound insulation mat normally. It is comprised by two, for 2.

The layer of RRIM polyurethane sound insulation with 5 ～ thick 3mm, uses buildup material is density and hardness relative to taller vitriolic barium (BaSO4) . Still added the foam of soft qualitative polyurethane with an average thick 30mm at the back of of RRIM polyurethane, local achieve 40mm. In sound-absorbing fall with the joint action of deadening, make the noise of engine is held back to be besides cockpit system well. Mat of sound insulation of TOURAN front wall is in the BUICK model of general motors company, clothes tree and spare wheel lid all use SRIM craft to make and become. Compare simple spare parts relatively to this kind of appearance and structure, do not need to grant to shape commonly fibre glass felt. Among them, what spare wheel builds is pouring those who use is average RIM machine, after heating felt of a piece of fibre glass first, put modular pitch inside, next RIM machine irrigates liquid stock fibre glass felt to go up. After irrigating PU raw material, fold the mould completely, material reacts a goods shapes namely after solidify inside the model. BUICK spare wheel is built in recent years, the car component that RRIM and SRIM craft reach North America in Europe got applied extensively in production domain, its goods can be mixed completely in intensity respect the goods photograph that metallic stuff machines is rivalled, and compare metal again on weight a lot of lighter, because this satisfied a car well light quantified development trend, extensive applied latent capacity is had in automobile manufacturing industry. CNC Milling CNC Machining