At present, with the high speed of the machine tool industry, the load on the ball screw is increasing, and the screw with high precision and large lead is very necessary. Therefore, the ball screw has become an indispensable part of the machine tool. The maintenance method of ball screw is generally the same as that of other devices, which will affect work efficiency and prevent accident risk. The following points can effectively improve the service life:

（1）轴向间隙。滚珠丝杠副拆装后，为保证反向传动精度和轴向刚度，必须轴向间隙。双螺母滚珠丝杠副间隙的方法为，利用两个螺母的相对轴向位移，使两个滚珠螺母中的滚珠分别贴紧在螺纹滚道的两个相反的侧面上。用这种方法预紧轴向间隙时，应注意预紧力不宜过大，否则会使空载力矩增加，从而降低传动效率。

(1) Eliminate axial clearance. After the disassembly and assembly of the ball screw pair, the axial clearance must be eliminated in order to ensure the reverse transmission accuracy and axial stiffness. The clearance elimination method of double nut ball screw pair is to make the balls in the two ball nuts close to the two opposite sides of the threaded raceway by using the relative axial displacement of the two nuts. When using this method to pre tighten to eliminate the axial clearance, it should be noted that the pre tightening force should not be too large, otherwise it will increase the no-load torque and reduce the transmission efficiency.

（2）定期检查滚珠丝杠副的润滑。可用润滑脂和润滑油润滑。润滑脂一般加在螺纹滚道和安装螺母的壳体空间内，而润滑油则经过壳体上的油孔注入螺母的空间内。应每半年对滚珠丝杠上的润滑脂更换一次，清洗丝杠上的旧润滑脂，涂上新的润滑脂。用润滑油润滑的滚珠丝杠副，可在每次机床工作前加油一次。

(2) Regularly check the lubrication of ball screw pair. It can be lubricated with grease and oil. Grease is generally added to the threaded raceway and the shell space for installing the nut, and lubricating oil is injected into the space of the nut through the oil hole on the shell. Replace the grease on the ball screw every six months, clean the old grease on the screw and apply new grease. The ball screw pair lubricated with lubricating oil can be refueled once before each operation of the machine tool.

（3）做好滚珠丝杠副的防护。滚珠丝杠副应避免灰尘或切屑、闭，如采用螺旋弹簧钢带套管、伸缩套管或折叠式套管等。安装时将防护罩的一端连接在滚珠螺母的端面，另一端固定在滚珠丝杠的支承座上。

(3) Protect the ball screw pair. The ball screw pair shall avoid dust or chips and closing, such as spiral spring steel belt sleeve, telescopic sleeve or folding sleeve, etc. During installation, one end of the protective cover is connected to the end face of the ball nut, and the other end is fixed on the support seat of the ball screw.

如果滚珠丝杠处于隐蔽的位置，则可采用密封圈防护，将密封圈装在螺母的两端。接触式密封圈防尘效果好，但因有接触压力，使摩擦力矩略有增加。非接触密封可避免摩擦力矩，但防尘效果稍差。工作时需避免碰击防护装置，防护装置有损坏要及时更换。

If the ball screw is in a concealed position, the sealing ring can be used for protection, and the sealing ring can be installed at both ends of the nut. The contact sealing ring has good dust-proof effect, but the friction moment increases slightly due to the contact pressure. Non contact sealing can avoid friction torque, but the dust-proof effect is slightly poor. Avoid hitting the protective device during operation, and replace the protective device in time if it is damaged.

（4）定期检查支承轴承。应定期检查丝杠支承与床身的连接是否松动，支承轴承是否损坏。如有问题应及时紧固松动部位并更换支承轴承。

(4) Check the support bearing regularly. Regularly check whether the connection between the lead screw support and the bed is loose and whether the support bearing is damaged. If there is any problem, fasten the loose part in time and replace the support bearing.