模具专业英语 第三版 Unit Three.ppt

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1、UnitThreePressProcessandDieDesignLesson12BlankingLesson13ExtrusionLesson14ForgingDieLesson12BlankingCuttingisashearingprocessthatonepartoftheblankiscutfromtheother.Itmainlyincludesblanking，punching，trimming，partingandshaving，wherepunchingandblankingaremostwidelyused.Blanking

2、andpunchingaretheprocessestoseparatesheetmetalalongaclosingoutline.冲裁是指使板料产生分离的剪切工艺过程。主要包括落料，冲孔，切边，切断，切口等，其中落料和冲孔应用最多。落料和冲孔是沿着封闭轮廓将板料分离的工艺过程。Punchingistopunchaneededholeinablankorworkpiece，andthematerialpunchedfromtheblankisthewaste，thatis，thepartoutoftheclosingoutlineisthewo

3、rkpiece，andthepartintheclosingoutlineisthewaste.Oppositely，blankingistopunchaworkpieceorblankwithneededshapeintheplate，thatis，thepartintheclosingoutlineistheworkpiece.Thepartoutoftheclosingoutlineisthewaste.冲孔是在毛坯或工件上冲出所需形状的孔，冲去的部分为废料，即封闭的外轮廓部分为工件，内轮廓为废料。相反地，落料指从板料上冲下所需形状的工件或

4、毛坯，即封闭的内轮廓为工件，而封闭的外轮廓则为废料。1.BlankingDeformationProcessAblankingprocessinvolvesplacingtheblankonthedie，movingthepunchdownwardtodeformandseparatetheblankwiththeedgesofthepunchanddie.AclearanceZisexistedbetweenthepunchanddie.Theforcesofthepunchanddieapplyingontheblankaremainlyco

5、ncentratingontheedgesofthepunchanddie.1.冲裁变形过程冲裁指将板料放置在凹模上，在压力机的作用下，凸模逐渐下降，直至使材料发生变形并产生分离。凸、凹模之间存在间隙Z。凸、凹模施加在材料上的作用力主要集中在模口周围的材料上。Undertheactionsofthepunchanddiewithsharpcuttingedgesandanappropriateclearance，deformationprocessundergoesthreestages，namely，elasticdeformation，pla

6、sticdeformationandfractureseparatingstages.在凸、凹模锋利刃口作用下以及间隙合适时，板料的变形过程经历了三个阶段，即弹性变形、塑性变形和断裂分离阶段。2.BlankingWorkpieceQualityThequalityoftheblankingworkpiecemainlyreferstothequalitiesofthecuttingcross-sectionandworkpiecesurface，shapetoleranceanddimensionalaccuracy.Thecuttingcros

7、s-sectioncanbedividedintofourregions:thesmoothshearedzone，fracturezone，rolloverzoneandburrzone.2.冲裁件的质量冲裁件的质量主要是指断面质量、工件表面质量、形状公差以及尺寸精度。冲裁件的断面有四个特征区:光亮带、断裂带、塌角带和毛刺。NewWords：punchingn.［计］穿孔;拳打trimmingn.整理;修饰elasticdeformation［力］弹性变形compressionn.压缩，浓缩perpendicularto...垂直于……roll

8、overn.翻转slidingdeformation滑移变形indentationn.压痕，［物］刻痕;凹陷dimensionalacc