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第九讲螺纹连接(Threads) 螺纹要素及分类KeyElementsandtypes 内外螺纹画法Representationsofinternalandexternalthreads 螺纹联接Threadedconnection 螺纹紧固件Threadedfasteners螺孔 Threadedhole9.1螺纹的形成、结构和要素Generation,structureandkeyelementsofthread车外螺纹 Latheexternalthread⒊螺纹的要素KeyElementsofthreads⑵螺纹的大径和小径Majordiameterandminordiameter外螺纹 Externalthread⑶螺纹的线数Numberofthreads⑷螺距和导程PitchandLead⑸螺纹的旋向Howthethreadspiral螺尾Threadrunout退刀槽Threadrelief9.2螺纹的种类Classificationofthreadscommonlyused联接 螺纹Conne-cting9.3螺纹的规定画法Conventionalrepresentationofthreads螺纹终止线画粗实线Threadendlinebythicksolidline螺纹终止线 Threadendlinebythicksolidline120°C2A-A画图步骤Steps:9.4螺纹的标注Threaddesignation⒉标注示例ExampleM20×29.5螺纹紧固件的标记和画法Threadedfasteners⒈六角螺母NutsP513⒉六角头螺栓BoltsP506⒊垫圈WashersP514⒋螺钉ScrewsP511⒈螺栓联接Boltjointsδ1画图步骤Steps:2.螺钉联接Screwjointsδ常见的错误画法Incorrectdrawings:锥顶角度? Whatistheangle?3.双头螺柱联接Astudjoints双头螺柱联接画法Representationofstudjoints小结Conclusion3.螺栓、螺钉、螺柱、螺母、垫圈都是标准件,掌握其联接装配图的规定画法(简化画法),注意比较它们的相同点和区别。掌握其标记内容。 Thescrewfastenersarestandardizedwhicharespecifiedbymeansofdesignationsandtheirrepresentations(conventionalandsimplified)inassemblydrawingaresymbolized。参考教材Referto:P403-420ANSI中表达外螺纹的两种方式: Tworepresentingforexternalthreadsinadrawing–ANSI:ANSI内螺纹 ANSIinternalthread:ANSI公制螺纹标注 ANSImetricthreadspecification:ANSI英制螺纹标注 ANSIthreadspecification(ininches):461、字体安装与设置