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河南科技大学毕业设计（论文）铜合金压气缸的热挤压工艺及模具设计摘要铜合金压气缸的生产方法常见的有管料的切削加工，离心铸造后切削加工，热挤压法。热挤压法生产材料利用率最高，生产效率最高，产品质量最高。本文分析热挤压工艺及模具设计。热挤压工艺分析综述：铜合金的热挤压温度根据经验可以定为730℃。压气缸的毛坯件属于杯形件的一种，因此采用的是反挤压。若采用一次挤压成形则所需挤压力和变形程度太大。因此采用两次反挤压，第一次将棒料挤压成为杯形件，切削加工成空心圆柱形。再经过第二次反挤压将内孔扩大，外径不变。经过两次反挤压得到挤压件成形毛坯。模具设计分析综述：两序挤压则需要两套挤压模具。两套模具采用通用凹模，结构简单。第一套模具凸模采用一般的反挤压凸模结构。第二套模具需要有模芯结构，模芯可以是固定式的也可以是活动式的。本次设计将模芯设计为固定式的即凸模和模芯一体式的。设计成整体式的好处是结构简单，生产效率高。与此同时，顶件器只需设计成中空的即可，当凸模压下时，模芯正好进入顶件器的内腔中。关键词：反挤压，压气缸，模具设计，模芯I河南科技大学毕业设计（论文）CopperAlloyCylinderPressureofHotExtrusionTechnologyandDieDesignABSTRACTCopperalloypressurecylinderproductionmethodscommonpipematerialcuttingprocessing,machiningaftercentrifugalcasting,hotextrusionmethod.Hotextrusionmethodisthehighestutilizationrateofmaterials,thehighestproductionefficiency,andthehighestqualityofproduct.Inthispaper,hotextrusiontechnologyanddiedesignisanalysed.Hotextrusiontechnologyanalysiswerereviewed:Copperalloycanbeclassifiedas730hotextrusiontemperatureaccordingtotheexperience.Pressure℃cylinderofablankpartsbelongtothecup,sothebackwardextrusionisused.Ifusinganextrusionforming,theneededextrusionanddeformationdegreeistoolarge.sothebackwardextrusionshoudbeusedtwice.Thefirstextrusionwillmakethebarbecomethecup,andthen,makethecupbecomethehollowcylindricalbymachining.Aftersecondbackwardextrusionwillenlargetheinnerhole,andtheoutsidediameterisconstant.Aftertwicebackwardextrusion,wecangetthebloom.Molddesignanalysiswerereviewed:ThetwoordersqueezingrequirestwosetsofextrusiondiesTwosetsofmouldadoptgeneralconcavedie.Thefirstsetofmouldpunchadoptsgeneralbackwardextrusionpunchdiestructure.Asecondsetofmouldneedamoldcorestructure,moldcorecanbestationaryoractivities.Thisdesignwilldesignforfixedthepunchmoldcoreandmoldcoreone-piece.Designintointegraladvantageissimplestructure,highproductionefficiencyatthesametime,toppiecessimplydesignedtobehollow,whentheconvexmold,moldcorerightintothelumenoftoppieces.KEYWORDS:backwardextrusion,cylinderpressure,molddesign,moldcoreII河南科技大学毕业设计（论文）目录前言..................................................................................................1第一章热挤压技术的介绍........................................2§1.1热挤压工艺的实质...........................................2§1.2热挤压工艺的特点...........................................2§1.3热挤压工艺的主要过程：........................3第二章工艺分析及制定..............................................4§2.1产品零件分析........................................................4§2.2挤压件图制定........................................................4§2.3工艺方案分析........................................................5§2.4毛坯形状及尺寸选择.....................................6第三章坯料的处理...........................................................8§3.1坯料加热方法........................................................8§3.2加热温度.....