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ID:14262897
大小:111.00 KB
页数:13页
时间:2018-07-27
《铸造和铸造过程外文文献翻译、中英文翻译、材料加工铸造外文翻译》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、铸造和铸造过程外文文献翻译、中英文翻译、材料加工铸造外文翻译外文原文CastinganditsprocessesIntroductionManufacturingprocesscanbeclassifiedintotwogeneralgroupsknownasprimaryandsecondaryprocessesTheprimaryprocessesnamelycastingforgingcoldheadingcoldextrudingbrakeformingandsoonarethosethatconvertrawmaterialinto
2、shapesTheseformingmethodsincludebothhotandcoldworkingprocessesandingeneralwillstillrequirefurtherfinishingoperationsinordertoobtainanendproductThesecondaryprocessesarethosethatbringtheparttothedimensionsandsurfacefinishspecifiedOnemayalsoincludeinthesecondaryprocessessuchop
3、erationsasheattreatingandsurfacetreatmentsforcorrosionresistancehardnessandappearanceSecondaryprocessesareplanningturningmillingdrillingboringreamingbroachinggrindinghoninglappingpolishingandspecialmethodsofmetalremovalsuchaselectrochemicalmachiningOperationslikescrewcuttin
4、gtappingthreadmillinggearcuttingandsoonaresecondaryprocessesthataremerelyadaptationsofoneoftheaforementionedprocessesthataremerelyadaptionofoneoftheaforementionedprocessesAcompletediscussionoftheseproceduresisbeyondthescopeofthistextThereforewewillconfineourselvestosuccinct
5、descriptionsofthemostprominenttechniques12CastingsCastingsareidentifiedbythetypeofmoldortheforcerequiredtoyfillthemoldMoldsareeitherpermanentorexpendableThepatternofsandshellandplastermoldshowevercanbeusedrepeatedlyformakingnewmoldsAsthemetalcoolsittakestheshapeofthecavityT
6、hebasiccastingmethodsaredescribedbelowSandcastings1ThegreensandprocessisoneinwhichmostbondedsandspackedaroundawoodormetalpatternThepatternisthenremovedandmoltenmetalispouredintothecavityWhenthemetalsolidifiesthemoldisbrokenandthecastingisremovedAlmostanymetalcanbeusedwithvi
7、rtuallynolimitastothesizeorshapeofthepartThemethodpermitscastingcomplexcomponentsatalowtoolingcostandisthemostdirectroutefrompatterntocastingSomemachiningisalwaysnecessarywiththegreensandprocessandlargecastingshaveroughsurfacefinishClosetolerancesaredifficulttoachieveandlon
8、gthinprojectionsshouldnotbecastItispossiblehowevertodesignforbossesundercutsandins
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