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时间:2020-03-04
《模具专业英语 第三版 Unit One.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、模具专业英语(第三版)MoldProfessionalEnglishConstitutionMoldMaterialsUnitOneTheInjectionMoldDesignPressProcessandDieDesignManufacturingTechnologyofMoldQuotationandContractforMold&DieUnitTwoUnitThreeUnitFourUnitFiveUnitOneMoldMaterialsLesson1PolymersLesson2MoldMaterials
2、Lesson3SelectionoftheSteelLesson1PolymersThewordpolymerliterallymeans“manyparts”.Apolymericsolidmaterialmaybeconsideredtobeonethatcontainsmanychemicallybondedpartsorunitswhichthemselvesarebondedtogethertoformasolid.Twoindustriallyimportantpolymericmaterialsar
3、eplasticsandelastomers.聚合物的字面意思是“很多部分”。高分子固体物质被认为是一种由很多化学分子和元素聚合成的固体物质。两种重要的工业高分子材料是塑料和橡胶。Plasticsarealargeandvariedgroupofsyntheticmaterialswhichareprocessedbyformingormoldingintoshape.Plasticscanbedividedintotwoclasses,thermoplasticsandthermosetting.塑料是一种应用
4、广泛、种类繁多的合成物,可以通过冲压或注塑加工成型。塑料可分为两类:热塑性塑料和热固性塑料。Thebasicbuildingblockofaplasticisthepolymermolecule,alongchainofcovalentbondedatoms.Secondarybondsthenholdgroupsofpolymerchainstogethertoformthepolymericmaterial.塑料的基本构成是聚合物分子,一条由共价键原子组成的长链。次级纽带将聚合物群体连在一起形成高分子材料。T
5、hetubingcomesinawiderangeofsizes,colors,andmaterials.Whenheated,itshrinkstoconformtothesizeandshapeoftheunderlyingmaterial,makinginstallationfastandeasy.热收缩管分为多种尺寸、颜色和材料,当受热时,它会自动收缩以顺应基本材料的大小和形状,使安装方便快捷。Syntheticfabricsaremanmadecopiesofnaturalfabrics.Synthe
6、ticfibersdonotoccurinnatureasthemselvesbutareusuallyderivativesofpetroleumproducts.合成纤维织物是人工仿造天然织物的产物。合成纤维通常是石油产品的衍生物,本身性质不会发生改变。Inaliquidcrystalphase,thepolymermoleculeshaveacertaindegreeoforder.Inthesimplestcase,theNematicphase,themoleculesgenerallypointint
7、hesamedirectionbutstillmovearoundwithrespecttooneanotheraswouldbeexpectedinaliquid.液晶状态下聚合物分子有一定的排列顺序。最简单的情况下,在向列相,分子通常向同一方向移动,但也会像在液体中那样相互周向运动。NewWords:polymeric/7pCli5merik/adj.聚合的elastomer/i5lAstEmE(r)/n.弹性体synthetic/sin5Wetic/n.合成物thermoplastics/7WE:mE5pl
8、Astiks/n.热塑性塑料molecule/5mClikju:l,5mEu-/n.分子insulation/7insju5leiFEn/n.绝缘品liquidcrystaldisplay液晶显示屏Lesson2MoldMaterialsMoldscanbemadefromaverybroadspectrumofmaterials,However,becausemostp
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