1、Overview概述Methods of drawing threads螺紋的畫法Thread marks螺紋的標記Exercises 練習題Screw Threads 螺 紋請點擊相應(yīng)標題顯示其內(nèi)容 Screw threads are continuous protrusions or grooves found along a helix on a revolving component with the same cross sections. 在回轉(zhuǎn)表面上沿螺旋線所形成的具有相同斷面的連續(xù)凸起和溝槽稱為螺紋。Internal threads: Screw threads on an i

2、nternal surface. 內(nèi)螺紋 在內(nèi)表面上形成的螺紋。 Overview 概 述1. Screw threads manufacturing 螺紋的形成請點擊鼠標左鍵顯示后面內(nèi)容External threads: Screw threads on an external surface. 外螺紋 在外表面上形成的螺紋。車刀結(jié)構(gòu)Chamfer 倒角Round head 球頭For installation purposes.便于安裝時導入；To prevent damage. 防止端部損壞；To provide operational safety.保證安全操作。Undercut 退刀

3、槽2. Thread structure 螺紋的結(jié)構(gòu) Thread head 螺紋端部 Purposes其作用是 Vanish thread is the plete segment at the end of a thread. 螺尾是指在車削螺紋終了時形成的不完整螺紋。請點擊鼠標左鍵顯示后面內(nèi)容 Overview 概 述 Undercut is a small groove that can be lathed in advance at the end of the component . 退刀槽是指在螺紋終止處預先車出一個小槽。Vanish thread 螺尾 Vanish threa

4、d and undercut 螺尾及退刀槽倒角刀結(jié)構(gòu)退刀槽加工 Thread diameter: Thread diameters include the major diameter (d, D), the minor diameter (d1, D1) and the pitch diameter ( d2, D2). 螺紋直徑： 螺紋的直徑包括大徑(d,D)、小徑(d1 ,D1）、 中徑（d2 ,D2）。 3. Thread elements 螺紋要素 Form of thread: The outline of the thread section cutting through th

5、e thread axis shows the thread tooth profile. 螺紋牙型： 通過螺紋軸線剖切時，螺紋斷面的輪廓形狀。請點擊鼠標左鍵顯示后面內(nèi)容 Triangular三角形Trapezoidal 梯形 Saw-tooth鋸齒形 Rectangular 矩形 Overview 概 述External screw thread diameters are indicated with lowercase letters外螺紋的直徑用小寫字母表示Inner screw thread diameters are indicated with capital letters內(nèi)螺

6、紋的直徑用大寫字母表示(5) Lead (Ph ) :The axial distance between two points of adjacent teeth of the same spiral line on the central diameter line is called lead, denoted as P h = nP. 導程(P h ):同一條螺旋線上相鄰二牙在中徑線上對應(yīng)二點間的軸 向距離，稱為導程，用P h= nP 表示。 (4) Pitch (P ): The axial distance between two points of adjacent teeth

7、on the central diameter line is called thread pitch, symbolized as P. 螺距(P ):相鄰兩牙在中徑線上對應(yīng)兩點間的軸向距離,以P 表示。 (3) Number of threads (n) : A screw can be a single or multiple thread. The number of threads is specified with letter “n”. 螺紋線數(shù)(n)：螺紋有單線和多線之分,用n 表示螺紋線數(shù)。請點擊鼠標左鍵顯示后面內(nèi)容 Overview 概 述 Double-start thr

8、ead 雙線螺紋Single-start thread單線螺紋導程=螺距 Revolving direction : A thread is called a right thread if it follows clockwise turning when entering, otherwise it is known as a left thread. 旋向 順時針方向旋入時為右旋螺紋，反之為左旋螺紋。 Overview 概 述 Left hand threads are generally used for devices with special requirement, such a

9、s a gas bottle switch. 左旋螺紋一般用于有特殊要求之處，如煤氣罐開關(guān)等。4. Types of threads 螺紋的種類(1) Classification following thread standardization 按標準化程度分類請點擊鼠標左鍵顯示后面內(nèi)容 Overview 概 述1) Standard thread The thread profile, diameters and pitch are standardized. 標準螺紋 牙型、直徑和螺距均符合國家標準的螺紋。 2) Special thread Threads manufactured f

10、ollowing profile norms of national standards, but their diameters and pitch do not necessarily have to meet such standard. 特殊螺紋 牙型符合國家標準,直徑和螺距不符合國家標準的螺紋。 3) Nonstandard thread Threads with profiles not specified in national standard. 非標準螺紋 牙型不符合國家標準的螺紋。Coarse pitch thread 粗牙螺紋Fine pitch thread 細牙螺紋M

11、etric thread 普通螺紋(M )Trapezoidal thread 梯形螺紋(Tr)1) Thread for fastening joining 緊固聯(lián)接用螺紋（簡稱緊固螺紋）Buttress thread 鋸齒形螺紋(B）Square thread 矩形螺紋請點擊鼠標左鍵顯示后面內(nèi)容 Overview 概 述(2) Classification according to application 按螺紋用途分類2) Thread for transmission 傳動用螺紋（簡稱傳動螺紋）Mini thread 小螺紋(S )本身不受力，起聯(lián)接或調(diào)節(jié)作用雙向傳動，如：絲杠單向傳動

12、,如:千斤頂60 sealing thread 60密封管螺紋Parallel internal pipe thread 圓柱內(nèi)螺紋（NPSC） 55non-sealing pipe thread 55非密封管螺紋（G ）請點擊鼠標左鍵顯示后面內(nèi)容 Overview 概 述3) Thread for pipes 管用螺紋（簡稱管螺紋）4) Special application thread 專門用途螺紋 （簡稱專用螺紋）Self-drilling screw thread 自攻螺釘螺紋 Thread for gas tanks 氣瓶專用螺紋Metric taper thread 米制錐螺紋(

13、ZM )55 sealing pipe thread55密封管螺紋Taper internal pipe thread圓錐內(nèi)螺紋（Rc）Parallel internal pipe thread圓柱內(nèi)螺紋（Rp）Taper external pipe thread圓錐外螺紋（R1/ R2 ）Taper pipe thread（external and internal ） 圓錐管螺紋（NPT） Major diameter dDrawing threads crest in thick lines;大徑d畫粗實線表示螺紋牙頂；Methods of drawing threads 螺紋的規(guī)定畫法

14、請點擊鼠標左鍵顯示后面內(nèi)容1. Description of external threads 外螺紋的畫法 1. Draw metric thread of 20mm nominal diameter. 畫公稱直徑為20mm的粗牙普通螺紋。 2. Draw pipe thread of size inch. 畫1/2 英寸的圓柱管螺紋。 Minor diameter d1Draw threads root in thin lines, but only a circle is drawn in the axial view. 小徑d1畫細實線表示螺紋牙底,在圓形的視圖中只畫3/4圈； The

15、 thread end lineDrawn in thick lines. 螺紋終止線畫粗實線； The vanish threadDrawn in thin lines, forming an angle of 30 with the axel (usually can be omitted). 螺尾,畫與軸線成30夾角的細實線(通常可省略不畫)； ChamferDrawn in thick lines, forming an angle of 45 with the axel. The chamfer is not drawn in the axial view. 倒角,畫粗實線,斜邊與軸

16、線成45夾角,在圓形的視圖中不畫倒角圓； Section linesDrawn in thin lines, get in touch with thick lines. 剖面線畫到粗實線處。手摸30英國圖例在圓形視圖中, 倒角圓會擋住螺紋細線, 因此不畫在圓形圖中，倒角圓會擋住螺紋細線，因此不畫手摸手摸得到的地方畫粗實線,摸不到的地方畫細實線 In the non-axial viewThe major diameter D, the minor diameter D1, the thread end line, the vanish thread and the chamfer are d

17、enoted in dashed lines.非圓視圖中 大徑D、小徑D1、螺紋終止線、螺尾、倒角均畫虛線；1. Draw metric thread of 20mmnominal diameter,2.5mmpitch,and 25mmlength. 畫公稱直徑為20mm,螺距為2.5mm,長度為25mm的粗牙普通螺紋。 120請點擊鼠標左鍵顯示后面內(nèi)容剖面線應(yīng)畫到粗實線2. Description of internal threads 內(nèi)螺紋畫法(1) Non-cutting 不剖畫法 The conic portion of the threaded blind hole Drawn

18、in two segments of dashed lines, forming an angle of 120; 螺紋不通孔錐坑 畫成120 夾角的虛線； In the axial viewThe minor diameter D1 is drawn in thick lines; Only 3/4 circle of the major diameter is drawn; The chamfer is not drawn. 在圓形視圖中小徑D1畫粗實線；大徑D只畫3/4圈細實線；不畫倒角圓。(2) Cutting 剖開畫法 In the non-axial viewThe major d

19、iameter D and the vanish thread are drawn in thin lines (usually can be omitted); The minor diameter D1, the thread end line, and the chamfer, are drawn in thick lines; 非圓視圖中大徑D、螺尾畫細實線（?？墒÷圆划嫞?；小徑D1、螺紋終止線、倒角均畫粗實線; In the axial viewThe minor diameter D1 is drawn in thick lines; Only 3/4 of the major d

20、iameter circle is drawn; The chamfer is not drawn.在圓形視圖中 小徑D1畫粗實線；大徑D只畫3/4 圈細實線；不畫倒角圓; The conic portion of the threaded blind hole Drawn in two segments of thick lines, forming an angle of 120; 螺紋 不通孔的錐坑 畫 120 夾角 的粗實線;The section linesDrawn in thin lines, get in touch with thick lines. 剖面線 畫到粗實線處。英

21、國圖例在圓形圖中，倒角圓會擋住螺紋細線，因此不畫120 In the sectional view of a thread joint, the joint portion is plotted according to the description of the external thread, and the rest is drawn following their respective description. 在繪制螺紋聯(lián)接的剖視圖時,其連接部分(旋合處)應(yīng)按外螺紋的 畫法繪制,其余部分仍按各自的畫法繪制; A-AA-AThe major and minor diameter li

22、nes of internal and external threads must be aligned accordingly. 內(nèi)、外螺紋的大徑線、小徑線應(yīng)分別對齊; When the section passes the axel of the solid pole, the thread is not cut and only its outline is drawn. 當通過實心桿件的軸線剖開時, 按不剖處理, 即只畫外形; The section linesDrawn in thick lines. 剖面線 畫到粗實線處; The section lines should be c

23、onsistent in all views for one thread part. 同一機件在各視圖中的剖面線傾斜方向和間距應(yīng)保持一致。1. Assembly drawing of metric threads. 畫普通螺紋聯(lián)接圖。2.Assembly drawing of pipe thread. 畫圓柱管螺紋聯(lián)接圖。先畫外螺紋, 再補齊內(nèi)螺紋投影請點擊鼠標左鍵顯示后面內(nèi)容AAAA應(yīng)一致應(yīng)一致英國圖例旋合處應(yīng)按外螺紋畫3.Assembly drawing of internal and external threads joints內(nèi) 外螺紋聯(lián)接畫法、 X2.5從大徑處引出尺寸線,再在其

24、上進行標注。 7g6g S 20 M Metric thread of 20mm nominal diameter,2.5mm pitch, left-hand, 7g6g tolerance class, short length. 標注公稱直徑為20 mm的粗牙普通螺紋,螺距2.5 mm,右旋,中徑、頂徑公差帶代號7g6g,短旋合長度。1. Standard thread marks 標準螺紋的標注請點擊鼠標左鍵顯示后面內(nèi)容 Thread marks 螺紋的標記 M 普通螺紋Blank for coarse tooth 粗牙省細牙注Blank for coarse tooth 單線省多線注

25、 Inner thread with capital letters 內(nèi)螺紋大寫字母 外螺紋小寫字母Blank for medium中旋合省短旋合S長旋合LBlank for right右旋省左旋LHType symbol Nominal diameterPitch/Ph lead (Pitch)特征代號公稱直徑螺距P/導程P h(螺距P)Tolerance stripe symbol公差帶代號Symbol of Joint length旋合長度代號Revolving Direction旋向代號(1) Marks of metric threads 普通螺紋的標注英國圖例G1/2LHAG1/2

26、ALH(2) Marks of pipe threads 管螺紋的標注請點擊鼠標左鍵顯示后面內(nèi)容 Pipe thread(non-screw-seal) of size symbol 1/ 2 and left-hand, tolerance class A. 標注非密封圓柱管螺紋,1/2 in,左旋,外螺紋公差等級為A級。 Thread marks 螺紋的標記Type symbol Dimension symbol Tolerance grade 特征代號 尺寸代號 公差等級Revolving Direction旋向G R1 R2 Rc RpBlank for right右旋省左旋LH 1/

27、 8、1/ 4、 3/ 8 、1/ 2、 3/ 4、1 External threads are marked with two degrees (A and B ), but the internal thread is not.外螺紋分A、B 兩級標注，內(nèi)螺紋不注The pipe thread must be marked with a leading line, elicited from the major diameter采用指引線標注從大徑處引出后再在其上標注The pipe thread must be marked with a leading line, elicited f

28、rom the major diameter應(yīng)從大徑處引出指引線后，再在其上進行標注Tolerance stripe symbol公差帶代號 Trapezoidal thread of 40mm nominal diameter,6mm pitch, double-start, left-hand, 6E tolerance class 標注公稱直徑為40 mm 的梯形螺紋,螺距6 mm,線數(shù)2,左旋,中徑公差帶代號6E,中旋合長度。 Tr40 Ph12(P 6)LH6E(3) Marks of trapezoidal threads 梯形螺紋標注Type symbol Nominal dia

29、meter Pitch / Ph lead (Pitch)特征代號 公稱直徑螺距P/導程Ph(螺距P)應(yīng)從大徑處引出尺寸線,再在其上進行標注請點擊鼠標左鍵顯示后面內(nèi)容 Thread marks 螺紋的標記Symbol of Joint length旋合長度代號Revolving Direction旋向 Tr 梯形螺紋Blank for coarse tooth 粗牙省細牙注Blank for coarse tooth 單線省多線注 Inner thread with capital letters 內(nèi)螺紋大寫字母 外螺紋小寫字母Blank for medium中旋合省短旋合S長旋合LBlank

30、 for right右旋省左旋LH請點擊鼠標左鍵顯示后面內(nèi)容 Thread marks 螺紋的標記2. Marks of special and nonstandard threads 特殊螺紋與非標準螺紋的標注Mark of special threads The word “special” must be added before the tooth profile symbol, and mark the major diameter and the pitch.應(yīng)在牙型符號前加注“特”字，并標注出大徑和螺距。 (2) Marks of nonstandard threads The

31、values of the major and minor diameters, the pitch, and the tooth profile must be marked. 應(yīng)標注出螺紋的大徑、小徑、螺距和牙型的尺寸。 a) Special thread特殊螺紋的標注b) Nonstandard thread非標準螺紋的標注Exercises 練習題1. Point out all mistakes in views. 指出圖中的錯誤。2. Point out all mistakes in views. 指出螺紋聯(lián)接圖中的錯誤。本 小 節(jié) 結(jié) 束謝謝您的認真學習！退出前一頁1. Poi

32、nt out all mistakes in views. 指出圖中的錯誤。請點擊解答顯示其內(nèi)容應(yīng)為細線小徑應(yīng)為細線螺紋終止線應(yīng)為粗實線小徑應(yīng)為細線且只畫3/4圈大徑應(yīng)為粗線且畫整圓圈剖面線應(yīng)畫到粗實線處應(yīng)為120大徑應(yīng)為細線且只畫3/4圈漏倒角輪廓粗線2. Point out all mistakes in views. 指出螺紋聯(lián)接圖中的錯誤。請點擊解答顯示其內(nèi)容內(nèi)螺紋小徑為粗線，大徑為細線應(yīng)為120內(nèi)、外螺紋的大、小徑線應(yīng)各自對齊同一機件剖面線應(yīng)一致應(yīng)為120旋合部分應(yīng)按外螺紋畫剖面線應(yīng)畫到粗實線處內(nèi)、外螺紋的小徑線應(yīng)對齊同一機件剖面線應(yīng)一致在圖片上點擊鼠標左鍵可以“暫?！被蛟俅巍安シ拧痹趫D片上點擊鼠標左鍵可以“暫停”或再次“播放”在圖片上點擊鼠標左鍵可以“暫?！被蛟俅巍安シ拧痹趫D片上點擊鼠標左鍵可以“暫?！被蛟俅巍安シ拧痹趫D片上點擊鼠標左鍵可以“暫停”或再次“播放”The pitch diameter is the diamet