螺紋的畫法與標注Drawingandlabelingofthreads主講人：劉詠濤教學目標Teachingobjectives1.了解螺紋的形成2.熟悉螺紋五要素3.掌握螺紋的畫法UnderstandtheformationofthreadsFamiliarwiththeFiveElementsofThreadMasterthedrawingmethodofthreads目錄CONTENTS1234認識螺紋UnderstandingThreads螺紋要素Threadelements螺紋的畫法DrawingofThreads思考題Reflectionquestions1認識螺紋UnderstandingThreadsONE連續(xù)凸起和凹槽Continuousprotrusionsandgrooves兩種螺紋應成對使用Twotypesofthreadsshouldbeusedinpairs外螺紋Externalthread內(nèi)螺紋internalthread螺紋thread連接螺紋Connectingthread傳動螺紋transmissionthread普通螺紋Screwthread梯形螺紋trapezoidalthread管螺紋pipethread鋸齒形螺紋sawtooththread2螺紋五要素FiveElementsofThreadTWONumberoflines線數(shù)pitch螺距diameter直徑Rotationdirection旋向Thread牙型螺紋五要素FiveElementsofThread輪廓形狀為牙型Thecontourshapeisatoothshape三角形triangle梯形trapezoid鋸齒形zigzag牙頂crest牙底Dental

base公稱直徑Nominaldiameter大徑dMajordiameterd中徑

d2Pitchdiameterd2小徑d1Minordiameterd1溝槽與凸起寬度相等Thewidthofthegrooveandprotrusionisequal螺旋線的條數(shù)Numberofspirals單線螺紋single-startthread雙線螺紋Doublethreadn螺距pitch相鄰兩牙在中徑上對應兩點之間的軸向距離TheaxialdistancebetweentwoadjacentteethonthemediandiametercorrespondingtotwopointsP導程lead同一螺紋上相鄰兩牙在中徑上對應兩點之間的軸向距離TheaxialdistancebetweentwoadjacentteethonthesamethreadandthecorrespondingtwopointsonthepitchdiameterPh螺紋的旋向Threadrotationdirection右旋dextrorotation左旋counter-clockwise3螺紋的畫法DrawingofThreadsTHREEM公稱直徑×螺距Nominaldiameter×pitch公稱直徑×Ph導程P螺距Nominaldiameter×PhleadPpitch中徑頂徑MiddiameterandtopdiameterM16×Ph3P1.5M16×Ph3P1.5-5g6g特征代號Featurecode尺寸代號SizeCode公差帶代號Tolerancezonecode其他other——旋合長度Spinninglength—旋向RotationdirectionM16×1.5M16×Ph3P1.5-5g6g-S-LH4思考題QuestionsFOUR12請思考如下問題Pleasethinkthefollowingquestions螺紋的倒角及退刀槽有什么作用?什么叫螺紋副?繪圖時又有什么規(guī)定?Whatarethefunctionsofchamferingandund