螺纹的画法与标注Drawingandlabelingoft

螺纹的画法与标注Drawingandlabelingofthreads主讲人：刘咏涛教学目标Teachingobjectives1.了解螺纹的形成2.熟悉螺纹五要素3.掌握螺纹的画法UnderstandtheformationofthreadsFamiliarwiththeFiveElementsofThreadMasterthedrawingmethodofthreads目录CONTENTS1234认识螺纹UnderstandingThreads螺纹要素Threadelements螺纹的画法DrawingofThreads思考题Reflectionquestions1认识螺纹UnderstandingThreadsONE连续凸起和凹槽Continuousprotrusionsandgrooves两种螺纹应成对使用Twotypesofthreadsshouldbeusedinpairs外螺纹Externalthread内螺纹internalthread螺纹thread连接螺纹Connectingthread传动螺纹transmissionthread普通螺纹Screwthread梯形螺纹trapezoidalthread管螺纹pipethread锯齿形螺纹sawtooththread2螺纹五要素FiveElementsofThreadTWONumberoflines线数pitch螺距diameter直径Rotationdirection旋向Thread牙型螺纹五要素FiveElementsofThread轮廓形状为牙型Thecontourshapeisatoothshape三角形triangle梯形trapezoid锯齿形zigzag牙顶crest牙底Dental

base公称直径Nominaldiameter大径dMajordiameterd中径

d2Pitchdiameterd2小径d1Minordiameterd1沟槽与凸起宽度相等Thewidthofthegrooveandprotrusionisequal螺旋线的条数Numberofspirals单线螺纹single-startthread双线螺纹Doublethreadn螺距pitch相邻两牙在中径上对应两点之间的轴向距离TheaxialdistancebetweentwoadjacentteethonthemediandiametercorrespondingtotwopointsP导程lead同一螺纹上相邻两牙在中径上对应两点之间的轴向距离TheaxialdistancebetweentwoadjacentteethonthesamethreadandthecorrespondingtwopointsonthepitchdiameterPh螺纹的旋向Threadrotationdirection右旋dextrorotation左旋counter-clockwise3螺纹的画法DrawingofThreadsTHREEM公称直径×螺距Nominaldiameter×pitch公称直径×Ph导程P螺距Nominaldiameter×PhleadPpitch中径顶径MiddiameterandtopdiameterM16×Ph3P1.5M16×Ph3P1.5-5g6g特征代号Featurecode尺寸代号SizeCode公差带代号Tolerancezonecode其他other——旋合长度Spinninglength—旋向RotationdirectionM16×1.5M16×Ph3P1.5-5g6g-S-LH4思考题QuestionsFOUR12请思考如下问题Pleasethinkthefollowingquestions螺纹的倒角及退刀槽有什么作用?什么叫螺纹副?绘图时又有什么规定?Whatarethefunctionsofchamferingandund