Lead screw refers to a kind of component on the machine tool, which is made of thin and long metal rods, with a high finish surface and some threads. The following is the content about the knowledge of lead screw compiled by Xiaobian. I hope you like it!

絲杠的基本內容

Basic content of lead screw

在機床上有一種部件是由細長長的金屬棒制造的。上面是光潔度很高的表面，有的還要帶有螺紋。

On a machine tool, there is a part made of thin and long metal bars. The top is a high finish surface, and some have threads.

一般在機床上面有螺紋的，叫絲杠。

Generally, there are threads on the machine tool, which is called lead screw.

1、按照國標GB/T17587.3-1998及應用實例，滾珠絲杠(目前已基本取代梯形絲杠，已俗稱絲杠)是用來將旋轉運動轉化為直線運動;或將直線運動轉化為旋轉運動的執行元件，并具有傳動效率高，定位準確等特點;

1. According to the national standard GB / t17587 3-1998 and application examples, ball screw (which has basically replaced trapezoidal screw and has been commonly known as lead screw) is used to convert rotary motion into linear motion; Or the actuator that converts linear motion into rotary motion, and has the characteristics of high transmission efficiency and accurate positioning;

2、當絲杠作為主動體時，螺母就會隨絲杠的轉動角度按照對應規格的導程轉化成直線運動，被動工件可以通過螺母座和螺母連接，從而實現對應的直線運動。

2. When the lead screw is used as the driving body, the nut will be transformed into linear motion according to the lead of the corresponding specification with the rotation angle of the lead screw. The passive workpiece can be connected with the nut through the nut seat, so as to realize the corresponding linear motion.

3、滾珠絲杠絲母間因無間隙，直線運動時精度較高，尤其在頻繁換向時無需間隙補償。滾珠絲杠絲母間摩擦力很小，轉動時非常輕松。

3. Because there is no gap between the ball screw and the nut, the precision is high when moving in a straight line, especially when reversing frequently, there is no need for gap compensation. The friction between ball screw and nut is very small, which is very easy to rotate.

4、滾珠絲杠與電機連接時中間需要加裝聯軸器以達到柔性連接。同步帶則可以直接用同步輪與電機出力軸連接。

4. When the ball screw is connected with the motor, a coupling needs to be installed in the middle to achieve flexible connection. The synchronous belt can be directly connected with the output shaft of the motor by the synchronous wheel.

5、滾珠絲杠副依據標準GB/T17587.3-1998, 分為定位滾珠絲杠副(P)和傳動滾珠絲杠副(T)兩大類.精度等級共分七個等級,即1.2.3.4.5.7.10級,1級精度高.依次降低.

5. Ball screw pair shall be in accordance with national standard GB / t17587 3-1998, divided into positioning ball screw pair (P) and transmission ball screw pair (T) The accuracy level is divided into seven levels, i.e. level 1.2.3.4.5.7.10. Level 1 has high accuracy Lower in turn

6、滾珠絲桿轉動一周螺母移動的距離為一個螺距距離,如果是絲杠每轉一周螺母移動四個(或五個)螺旋線的距離，那么表示該絲杠是四線(或五線)絲杠，俗稱四頭(或五頭)絲杠。 一般小導程滾珠絲杠都采用單線，中，大或超大導程采用兩線或多線。

6. The nut movement distance of the ball screw rotates for one cycle is a pitch distance. If the nut moves four (or five) helixes every cycle of the screw, it means that the screw is a four wire (or five wire) screw, commonly known as four head (or five head) screw. Generally, the small lead ball screw adopts single line, and the medium, large or super large lead adopts two or more lines.

絲杠的加工方法旋風銑削絲杠 絲杠的加工旋風銑是安裝在車床上與車床配套的高速銑削螺紋裝置，將旋風銑安裝在車床中拖板上車床夾持絲杠完成低速進給運動，旋風銑帶動外旋刀盤硬質合金刀具高速旋轉，完成切削運動。從絲杠上銑削出螺紋的螺紋加工方法。因其銑削速度高(速度達到400m/min)加工效率快。并采用壓縮空氣進行排屑冷卻。加工過程中切屑飛濺如旋風而得名-絲杠旋風銑

Processing method of lead screw whirlwind milling lead screw processing whirlwind milling is a high-speed thread milling device installed on the lathe and matched with the lathe. The whirlwind milling is installed on the carriage in the lathe. The lathe clamps the lead screw to complete the low-speed feed movement, and the whirlwind milling drives the high-speed rotation of the external rotating disc cemented carbide cutter to complete the cutting movement. Thread processing method for milling thread from lead screw. Because of its high milling speed (up to 400m / min), the machining efficiency is fast. Compressed air is used for chip removal and cooling. In the process of machining, the chip splashes like a whirlwind, which is named lead screw whirlwind milling

絲杠的主要參數

Main parameters of lead screw

1)外徑d(大徑)(D)與外螺紋牙頂相重合的假想圓柱面直徑亦稱公稱直徑

1) The diameter of the imaginary cylindrical surface whose outer diameter D (major diameter) (d) coincides with the crown of the external thread is also called the nominal diameter

2)內徑(小徑)d1(D1)與外螺紋牙底相重合的假想圓柱面直徑，在強度計算中作危險剖面的計算直徑

2) The diameter of the imaginary cylindrical surface whose inner diameter (small diameter) D1 (D1) coincides with the bottom of the external thread shall be used as the calculated diameter of the dangerous section in the strength calculation

3)中徑d2在軸向剖面內牙厚與牙間寬相等處的假想圓柱面的直徑，近似等于螺紋的平均直徑d20.5(d+d1)

3) The pitch diameter D2 is the diameter of the imaginary cylindrical surface where the tooth thickness is equal to the inter tooth width in the axial section, which is approximately equal to the average diameter of the thread D20 5(d+d1)

4)螺距P相鄰兩牙在中徑圓柱面的母線上對應兩點間的軸向距離

4) Pitch P the axial distance between two adjacent teeth corresponding to two points on the bus of the pitch cylindrical surface

5)導程(S)同一螺旋線上相鄰兩牙在中徑圓柱面的母線上的對應兩點間的軸向距離

5) Lead (s) the axial distance between the corresponding two points of two adjacent teeth on the generatrix of the pitch diameter cylinder on the same helix

6)線數n螺紋螺旋線數目，一般為便于制造n≤4螺距、導程、線數之間關系：L=nP

6) Number of threads n number of spiral threads, generally for ease of manufacture n≤ 4. Relationship among pitch, lead and number of wires: l = NP

7)螺旋升角在中徑圓柱面上螺旋線的切線與垂直于螺旋線軸線的平面的夾角。

7) The angle between the tangent of the helix and the plane perpendicular to the axis of the helix on the pitch diameter cylinder.

8)牙型角螺紋軸向平面內螺紋牙型兩側邊的夾角9)牙型斜角螺紋牙型的側邊與螺紋軸線的垂直平面的夾角。對稱牙型

8) Profile angle the included angle between the two sides of the internal thread profile in the axial plane of the thread 9) profile angle the included angle between the side of the thread profile and the vertical plane of the thread axis. Symmetrical tooth pattern

各種螺紋(除矩形螺紋)的主要幾何尺寸可查閱有關標準公稱尺寸為螺紋外徑對管螺紋近似等于管子的內徑。

The main geometric dimensions of various threads (except rectangular threads) can be found in relevant standards. The nominal size is that the outer diameter of the thread is approximately equal to the inner diameter of the pipe thread.

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