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1、广汉职业中专学校16级机械专业项目3车内外圆锥面课题:车内外圆锥面教学目的:1、掌握圆锥各部分的名称和计算2、掌握车内外圆锥面的方法教学重点、难点:掌握车内外圆锥面的方法教学课时:8课时授课方法:讲授法,实践法任务3.1车外圆锥面一、圆锥的基础知识(一)、术语及定义1.圆锥表面与轴线成一定角度,且一端相交于轴线的一条直线段(母线),围绕轴线旋转形成的表面。2.圆锥由圆锥表面与一定尺寸所限定的几何体。3.圆锥的基本参数(1)圆锥角a(2)大端直径D(3)小端直径dofchickenmanurebacteria,eggscanbekil
2、led,makechickenmanuresafeorganicfertilizerwithhighefficiency.Timelywatering,makesureseedlingstomoisturerequirements.(4)theapplicationofnewtypehighefficientinhibitorfertilizercaneffectivelypreventdamagecausedbytheeffectofquick-actingorganicfertilizeronseedling,andpreven
3、tsoilcompaction,promotehealthygrowth.2,theuseofsomeofthenewtechnicalmeasures,improvethesurvivalrate(1)increasedtreeholes.Useofexcavatorsandcombineartificialdigtreeholes,improveefficiency,increasethewaterstoragecapacityoftreeholes,enhanceseedlingdroughtresistance.(2)cov
4、ered.Seedlingsplantedinthewinterandearlyspringseason,andafterfillingfloodedtwice,points,andplasticfilmmulchingtreeholes,rootsofboththetemperatureandreducethemoisturetoevaporate,reducingplantdeathduetophysiologicaldrought,improvethesurvivalrateofseedlings.(3)treeprotect
5、ion.Aftertothetrunkwitharopewinding,outsideonthecoveredalayerofmulch,moisturizing,thermalinsulation,canimprovethesurvivalrateofseedlings.(4)theuseofbranchPo.Baoisthelatesttechnologyofcultivationoffruittrees,branches,especiallyformoreexpensivebutdifficultbranchesofseedl
6、ings,haveobviouseffectsinGardentreespeciescanalsobeused.Second,measurestoreducecostsandshorten,reducelaborintensity广汉职业中专学校16级机械专业(1)圆锥长度L(2)锥度CC=D-d/L二、圆锥的各部分尺寸计算1.圆锥半角a/2tan(a/2)=D-d/2L例:P582.锥度CC=D-d/L例:P70(二、)工具圆锥一、莫氏圆锥0、1、2、3、4、5、6、从大到小二、米制圆锥4、6、80、100、120、160、200
7、指大端直径C=1:20(三)、车圆锥的方法主要有以下五种方法1.转动小滑板法2.偏移尾座法3.仿形法(靠模法)ofchickenmanurebacteria,eggscanbekilled,makechickenmanuresafeorganicfertilizerwithhighefficiency.Timelywatering,makesureseedlingstomoisturerequirements.(4)theapplicationofnewtypehighefficientinhibitorfertilizercane
8、ffectivelypreventdamagecausedbytheeffectofquick-actingorganicfertilizeronseedling,andpreventsoilcompaction,promotehea