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常州机电职业技术学院毕业设计(论文)I常州机电职业技术学院毕业设计（论文）作者：学号：系部：模具技术系专业：精密模具设计与制造题目：冷冲模（带凸缘拉伸件）指导者：评阅者：2015年5月常州机电职业技术学院毕业设计(论文)II带凸缘拉深件模具设计摘要拉深是利用模具使平板毛坯变成为开口的空心零件的冲压方法，用拉深工艺可以制成筒形、阶梯形、锥形、抛物面形、盒形和其他不规则形状的薄壁零件，其中又以筒形件简单和多见，而有凸缘筒形件又分为宽凸缘和窄凸缘件。只有加强拉深变形基础理论的研究，才能提供更加准确、实用、方便的计算方法，才能正确地确定拉深工艺参数和模具工作部分的几何形状与尺寸，解决拉深变形中出现的各种实际问题，从而，进一步提高制件质量。在拉深工艺设计时，必须知道冲压件能否一次拉出，这就引出了拉深系数的概念。拉伸系数决定于每次拉深时允许的极限变形程度。在多次拉深中，对于宽凸缘拉深件，则应在第一次拉深时，就拉成；零件所要求的凸缘直径，而在以后各次拉深中，凸缘直径保持不变。为了保证以后拉深时凸缘不变形，宽凸缘拉深件首次拉入凹模的材料应比零件最后拉深部分实际所需材料多3%~5%,这些多余材料在以后各次拉深中，逐渐将减少部分材料挤回到凸缘部分，使凸缘增厚，从而避免拉裂。关键词：筒形，模具设计，拉深，冲压常州机电职业技术学院毕业设计(论文)IIIAbstractTheextensionisamouldtomaketheplateblankintothestampingmethodforhollowpartsoftheopening,thin-walledpartswithdeepdrawingprocesscanbemadeintoacylindershape,laddershaped,cone,parabolic,boxandotherirregularshapes,andthecaseofcylindricalpartssimpleandrare,andflangecylindricalpartsisdividedintowideflangeandnarrowflange.Onlybystrengtheningthebasictheoryresearchofdeformationcalculationmethodofdrawing,canprovidemoreaccurate,practicalandconvenient,cancorrectlydeterminethegeometryandsizeofdrawingprocessparametersandworkingpartsofdie,tosolvetheactualproblems,drawingdeformationinordertofurtherimprovethequalityofworkpieces.Intheprocessdesignofdeepdrawing,mustknowwhetherastampingout,thisleadstotheconceptofdrawingcoefficient.Limitdrawingcoefficientdependsoneachdrawingtheallowabledeformationdegree.Manyinthedrawing,forwideflangedrawingparts,shouldbeinthefirstdrawing,pullinto;thediameteroftheflangepartsrequired,andaftereachtimedepth,thediameteroftheflangeremainunchanged.Inordertoensuretheflangewithout常州机电职业技术学院毕业设计(论文)IVdeformationafterdrawing,wideflangedrawingpartsforthefirsttimeintothediematerialshouldbebetterthanthelastpartoftheactualpartsdrawingmaterialsneededformultiple3%~5%,theseextramaterialsaftervarioustimesofdeep,graduallywillreducepartmaterialoutbacktotheflangeportion,theflangethickened,soastoavoidcracking.Keywords:cylinder,molddesign,drawing,stamping常州机电职业技术学院毕业设计(论文)V目录摘要.................................................................................................IIAbstract............................................................................................III前言................................................................................................1第1章加工零件的工艺分析.........................................................31.1零件分析................................................................................31.2冲压件的工艺分析................................................................31.3制定冲压工艺方案................................................................4第2章模具总体设计.....................................................................62.1模具类型的选择....................................................................62.2操作方式................................................................................62.3卸料、出件方式....................................................................62.3.1卸料方式......................................................................62.3.2出件方式....................................................................6第3章模具设计计算.......................................................................73.1工艺参数的确定及计算........................................................73.2确定拉伸次数........................................................................73.3排样及材料的利用率............................................................83.3.1排样方法......................................................................83.3.2材料的利用率............................................................9第4章冲压模具设计.....................................................................94.1确定冲压类型及结构形式....................................................94.2计算工序压力、选择压力机.................................................94.2.1落料力..........................................................................94.2.2卸料力..........................................................................94.2.3拉伸力........................................................................104.2.4压边力........................................................................104.3.计算模具压力中心............................................................104.4.计算模具零件主要工作部分刃口尺寸.............................11常州机电职业技术学院毕业设计(论文)VI第5章模具零件的选用.................................................................125.1模架的选择..........................................................................125.2冲压设备的选用..................................................................12第6章模具制造技术要求.............................................................136.1表面粗糙度及标准..............................................................136.2配合要求..............................................................................14第7章编写技术条件.....................................................................15第8章设计并绘制模具总装图及选取标准件..............................17毕业设计小结..................................................................................18结论.................................................................................................