外文原文-塑料及塑料工业的发展.pdf

1、PlasticsPlastics andand plasticplastic industriesindustriesPlastic parts in the industrial production has been able to widely used,becausethey themselves have decided a series of special benefits.Plastic density,qualityof light.The density of most plastics in 1.0-1.4 g/cm between.Plastic,chemicalsta

2、bility,to acid,alkali,and many pharmaceutical compounds have good corrosionresistance and good wear resistance of plastics by grinding,so many of the modernindustrial gears,bearings,rings and other mechanical parts and the bees began to useprojects plastics manufacturing.In addition,the plastic is a

3、lso very good dampingand sound insulation,and many plastics also have light and heat insulation andwaterproof,breathable and radiation release and other special properties,therefore,plastic has become indispensable to all walks of life an important material.The development trend of plastic molding t

4、echnology1.CAD/CAE/CAM technology,rapid development and wide application2.All kinds of mold development and use of new materials3.Miniaturization of plastic parts,large and precision of4.The standardization of moldThe classification of many of the plastic mold,according to different methods ofplasti

5、c molding parts can be divided into the following categories:Injection moldCompression moldExtrusion diePneumatic moldIn addition to the introduction of several types of commonly used plastic mold,thereare foam mold,casting mold,rotational molding(including slush)mold,cold rollingTeflon mold and mol

6、d,etc.PlasticPlastic moldmold designdesignGeneralGeneral overviewoverview ofof moldmold designdesignA A CompositionComposition ofof thethe InjectionInjection MouldMouldInjection mold set by the dynamic model and the model of two major components.Dynamicmodel installed in the moving platen on the inj

7、ection machine,will be installed in theinjection mold machine fixed template.Injection before the move,scheduled to diein the injection molding machine driven by the closure,the formation of cavity and gatingsystem,plastics injection machine will have the plastic melt into the cavity throughthe cast

8、ing system,the cooling and solidification,the move,scheduled to die open,stripping organizations to plastic parts.Injection mold can be composed of the following seven systems or institutions:1.Molding partsGenerally cavity,core,forming rods,inserts,etc.,in themove.Scheduled to die is closed,forming

9、 part of the plastic parts will determinethe internal and external dimensions.2.Guide positioning mechanismTo ensure the move,scheduled to die is closedand accurate positioning and set-oriented parts,generally by the guide post,guide sleeve composition.3.Gating systemCavity by the injection machine

10、nozzle to the feed channelbetween the gating system is called,generally from the main channel,diversionchannel,composed of the gate and the cold slug.4.Stripping institutionsRefers to the process of mold or mold plastic partsmold from the mold after the introduction of the institution,usually by the

11、putter,putting the fixed plate,push plate,the reset lever,pulling rod andso on.5.Side parting and core pullingMolding with a concave side holes or sideplastic parts,plastic parts to be introduced in,you must first lateral sideparting and core out.6.Temperature control systemCommonly used mold coolin

12、g circulating watercooling.Mold can pass into the hot water heating,steam,hot oil or heatingelement in the mold set.7.Exhaust SystemParting surface is generally set up in exhaust ducts or theuse of push rod,with the gap exhaust inserts.ClassificationClassification ofof InjectionInjection MouldMould1

13、.The overall structure of feature classification by mold(1)single injection mold parting surface(2)Double Injection Mould Parting Surface(3)with a side parting and core-pulling mechanism of the injection mold(4)with the activities forming part of the injection mold(5)Motorized off the thread of the

14、injection mold(6)No flow injection mold2.According to the species classification of plastic(1)thermoplastic(2)rubber modified materials such as TPR,TPE injection molding(3)Low foam injection molding(4)a variety of common materials or multi-color injection molding3.Classified by the volume of mold ca

15、vitySaid cavity has a capacity of morethan 3000cmlarge injection mold,less than or equal to 100cm of small injectionmold injection mold,said,in between medium-sized injection mold.4.According to the dimensional accuracy of classification of productsPrecisioninjection mold to IT8 IT9 level accuracyPa

16、rtingParting SurfaceSurface DesignDesignA A TheThe formform ofof sub-surfacesub-surface1.Parting injection molding machine according to their location and movementdirection of the relationship between mold to classification:sub-surfaceperpendicular to the mold injection machine direction of movement,parallel tothe direction of mold movement,tilting in the direction of mold movement.2.Surface by sub-classification of the shape:flat parting,parting surfaces,stepped parting surface and sub-surface