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!

丝杠的基本内容

Basic content of lead screw

在机床上有一种部件是由细长长的金属棒制造的。上面是光洁度很高的表面，有的还要带有螺纹。

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.

一般在机床上面有螺纹的，叫丝杠。

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

1、按照国标GB/T17587.3-1998及应用实例，滚珠丝杠(目前已基本取代梯形丝杠，已俗称丝杠)是用来将旋转运动转化为直线运动;或将直线运动转化为旋转运动的执行元件，并具有传动效率高，定位准确等特点;

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、当丝杠作为主动体时，螺母就会随丝杠的转动角度按照对应规格的导程转化成直线运动，被动工件可以通过螺母座和螺母连接，从而实现对应的直线运动。

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、滚珠丝杠丝母间因无间隙，直线运动时精度较高，尤其在频繁换向时无需间隙补偿。滚珠丝杠丝母间摩擦力很小，转动时非常轻松。

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、滚珠丝杠与电机连接时中间需要加装联轴器以达到柔性连接。同步带则可以直接用同步轮与电机出力轴连接。

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、滚珠丝杠副依据标准GB/T17587.3-1998, 分为定位滚珠丝杠副(P)和传动滚珠丝杠副(T)两大类.精度等级共分七个等级,即1.2.3.4.5.7.10级,1级精度高.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、滚珠丝杆转动一周螺母移动的距离为一个螺距距离,如果是丝杠每转一周螺母移动四个(或五个)螺旋线的距离，那么表示该丝杠是四线(或五线)丝杠，俗称四头(或五头)丝杠。 一般小导程滚珠丝杠都采用单线，中，大或超大导程采用两线或多线。

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.

丝杠的加工方法旋风铣削丝杠 丝杠的加工旋风铣是安装在车床上与车床配套的高速铣削螺纹装置，将旋风铣安装在车床中拖板上车床夹持丝杠完成低速进给运动，旋风铣带动外旋刀盘硬质合金刀具高速旋转，完成切削运动。从丝杠上铣削出螺纹的螺纹加工方法。因其铣削速度高(速度达到400m/min)加工效率快。并采用压缩空气进行排屑冷却。加工过程中切屑飞溅如旋风而得名-丝杠旋风铣

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

丝杠的主要参数

Main parameters of lead screw

1)外径d(大径)(D)与外螺纹牙顶相重合的假想圆柱面直径亦称公称直径

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)内径(小径)d1(D1)与外螺纹牙底相重合的假想圆柱面直径，在强度计算中作危险剖面的计算直径

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)中径d2在轴向剖面内牙厚与牙间宽相等处的假想圆柱面的直径，近似等于螺纹的平均直径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相邻两牙在中径圆柱面的母线上对应两点间的轴向距离

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

5)导程(S)同一螺旋线上相邻两牙在中径圆柱面的母线上的对应两点间的轴向距离

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)线数n螺纹螺旋线数目，一般为便于制造n≤4螺距、导程、线数之间关系：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)螺旋升角在中径圆柱面上螺旋线的切线与垂直于螺旋线轴线的平面的夹角。

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)牙型角螺纹轴向平面内螺纹牙型两侧边的夹角9)牙型斜角螺纹牙型的侧边与螺纹轴线的垂直平面的夹角。对称牙型

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

各种螺纹(除矩形螺纹)的主要几何尺寸可查阅有关标准公称尺寸为螺纹外径对管螺纹近似等于管子的内径。

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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