PVP ball screw consists of screw, nut and ball. Its function is to transform rotary motion into linear motion, which is the further extension and development of ball screw. The significance of this development is to change the bearing from rolling motion to sliding motion. Due to its small friction resistance, ball screw is widely used in various industrial equipment and precision instruments.

滚珠丝杆是工具机和精 密机械上常使用的传动元件，其主要功能是将旋转运动转换成线性运动，或将扭矩转换成轴向反覆作用力，同时兼具高精度、可逆性和高 效率的特点。

Ball screw is often used in tool machines and precision machinery. Its main function is to convert rotary motion into linear motion or torque into axial repetitive force. At the same time, it has the characteristics of high precision, reversibility and high efficiency.

一、pvp滚珠丝杆的金属返向器对比塑料返向器有以下几点优势：

1、 Compared with plastic ball screw, metal ball screw has the following advantages

1、耐磨损，保证了滚珠丝杆的使用寿命和稳定性。

1. Wear resistance ensures the service life and stability of the ball screw.

2、耐高温，在高温的工况环境下不变形。

2. High temperature resistance, no deformation in high temperature environment.

3、金属返向器更为顺畅的滚珠弯道设计使滚珠丝杆的传动工作更加顺滑自然。

3. The smoother design of the ball curve of the metal reverser makes the transmission of the ball screw more smooth and natural.

4、一般的螺母分两次磨，我们的螺母一次成型，同心度更高，精 密度更高。

4. The general nut is grinded twice, our nut is molded once, with higher concentricity and precision.

二、滚珠丝杆的选定要领

2、 Selection of ball screw

选择滚珠丝杆时，要调查清楚运转条件再决定设计。选择的要素有负荷重量、衝程、力矩、定位精度、重覆定位精度、刚性、导程、螺帽孔径等，各个要素之间都有关联，其中一项要素改变就会引起其他要素的改变，必须注意各要素之间的均衡。

When selecting the ball screw, we should first investigate the operating conditions and then decide the design. The selected elements include load weight, stroke, torque, positioning accuracy, repeat positioning accuracy, rigidity, lead, nut hole diameter, etc. all the elements are related. The change of one element will cause the change of other elements, so we must pay attention to the balance among the elements.

1、润滑

1. Lubrication

使用滚珠丝杆时，必须要具有足够的润滑，如果润滑不够会发生与金属接触，导致摩擦与摩耗的增加，造成故障或是寿命缩短等。

When using the ball screw, it must have enough lubrication. If the lubrication is not enough, it will contact with the metal, resulting in the increase of friction and friction, resulting in failure or shortened service life.

2、偏荷重

2. Partial load

当偏荷重现象发生时，将直接影响丝杆的寿命及噪音，且多随着运转不顺的手感，若丝杆空载时与组装后顺畅度不同，除了注意丝杆本身的精度外，大多是组合精度不良产生偏荷重现象。

When the phenomenon of partial load occurs, it will directly affect the life and noise of the screw rod, and with the operation of the handle is not smooth, if the smoothness of the screw rod is different from that after assembly, in addition to paying attention to the accuracy of the screw rod itself, most of them are poor combination accuracy, resulting in the phenomenon of partial load.