欢迎来到天天文库
浏览记录
ID:42166065
大小:92.50 KB
页数:9页
时间:2019-09-09
《[资料]材料成型专业英语》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、Lesson1Positionofmetalforminginmodernindustry金属成形在现代工业中的地位Metalformingisoneofthefundamentalmanufacturingprocess.Itplaysanimportantpartinmetallurgymachinebuilding机械制造,power41Jj,autobile汽车,railroad,aerospace航空,ship-building,weapon,chemical化工,electronics电了,instrument
2、andmetermaking仪器和仪表制造andlightindustries轻工业.金属成形是材料的塑性加工过程。在金属成形工艺屮,最初的简单零件,坏料或板料通过在模具Z间变形而获得所需零件的最终形状。山于模具具有所需零件的儿何形状,通过模具内表面对变形材料施压,简单形状的零件就会变成复杂形状的零件。金属成形很少产生废料其至不产牛废料,并且往往在很短时间内(即压力机或锻锤的i次或儿次行程中)形成产品形状。因此,金属成形可节能省材。特别是在大中批量生产时,模具成本容易收回。另外,对于给定重量的零件,用金属成形加工比用铸造和
3、切削加工生产具有更好的力学性能、冶金性能和可靠性。Atpresent,netshapemanufacturing净形制造ondnearnetshapemsnufacturing近净形制造havebecomethefocusofstudies研究的焦点pursed追逐bythemetalformingcircle领域.Researchinstitutions研究学会,研究机构concentmtingonthestudyofnetshapemanufacturing净形制造havebeenestablished建立andeno
4、rmous巨:大fundsandminds财力与智力invested.Netshapenidnufocturingisvigorouslydevelopingthroughouttheworld.Bytheapplicationofcoldextrusion冷挤压,coldheading冷徹,precisiondieforging^密模锻,specialrolling特殊滚压,fineblanking精冲,spinning旋压,multi—ramforging多向模锻,multi—positionpressing多工位压制
5、,high-speedpressingwithprogressivedies级进模高速冲压,powderforging粉末锻压,superplaSticforming超塑性成形andlaserprocessing激光加工,finishedpartscanbeproducedwithhighaccuracy高精确度,lowsurfacecrudeness粗糙度•Thedayshavea1readygonewhen(定语从彳U)metalformingwasconsidered认为asaprocessbywhichonly认为
6、asaprocessbywhichonlysemifinishedproductscouldbemade(从句).Itispredicted预测by…that(从句)bytheyear2000metalformingcombinedwiththeyear2000metalformingcombinedwithgrindingtechnology(定语)磨削工艺willreplacemostofmetalcutting.Lesson2ClassificationofMetalFormingProcessesNearlyall
7、mentaiformingprocessesinvolvetheworkpiecebeingsubjectedtocomplexstressstates(处于复杂应力状态下)whichcanvaryfrom,saytriaxialcompression(三向压应力)tobiaxialtension(两向拉应力)•However,shearstresses(剪切应力)neednotbeconsideredunlesstheyconstitute(构成)majorstressestowhichtheworkpieceissub
8、jectedandarethusinfluentialincontributingtoplasticdeformation.Mostofthecomplexstressstatescanbeapproximated(近似)bytheirprincipalstresscomponents(主应力),tha
此文档下载收益归作者所有