Through the on-site technical verification of the ball screw and repeated exploration and production practice, the assembly technical requirements for the ball screw are:

(1)，用整体式专用芯棒校正丝母座孔，使其与基准导轨的正、侧向平行度在0.01/1000以内；

(1) Firstly, use the integrated special mandrel to correct the screw mother seat hole so that the positive and lateral parallelism with the reference guide rail is within 0.01/1000;

(2)固定丝母座后，用测量夹具实际测量丝母座孔距基准导轨的正、侧向距离；然后，轴承孔与基准导轨的正侧平行度也用整体式专用检棒找正，在0.01/1000以内。用专用测量夹具实际测量轴承孔距基准导轨的正侧距离，要求丝母孔与基准导轨的正侧距离一致，允差为0.01；固定轴承座。该方法采用整体专用检棒，不仅长度短，而且将芯棒与定位套合成一体，芯棒与定位套的配合间隙，可靠保证了轴承孔、丝母座孔与导轨的平行度；

(2) After fixing the nut seat, use the measuring fixture to actually measure the positive and lateral distance between the nut seat hole and the reference guide rail; Then, the parallelism between the bearing hole and the positive side of the reference guide rail is also aligned with an integral special inspection rod, which is within 0.01/1000. The distance between the bearing hole and the positive side of the reference guide rail shall be actually measured with a special measuring fixture. The distance between the screw nut hole and the positive side of the reference guide rail shall be consistent, and the tolerance shall be 0.01; Fix the bearing pedestal. The method adopts an integral special inspection rod, which is not only short in length, but also integrates the mandrel and the positioning sleeve. The matching clearance between the mandrel and the positioning sleeve reliably ensures the parallelism of the bearing hole, the nut seat hole and the guide rail;

(3)通过实际距离测量，可靠保证了两端轴承支撑孔与丝母座孔的同轴度，降低了滚珠丝杠副的绕度和径向偏置载荷，提高了丝杠副的安装精度。

(3) Through the actual distance measurement, the coaxiality of the bearing support holes at both ends and the nut seat holes is reliably ensured, the winding and radial offset load of the ball screw pair are reduced, and the installation accuracy of the screw pair is improved.

(4)此外，在安装滚珠丝杠的过程中，需要严格控制滚珠丝杠的轴向移动，这将直接影响滚珠丝杠进入系统的传动位置精度。根据现场实际验证，要组装好安装伺服电机端轴承座内的轴承，在滚动丝杠传动过程中起主要作用，将滚珠丝杠的轴向窜动控制在0.015~0.02之间；然后，组装另一端轴承座内的轴承，将轴向窜动控制在0.01以内。这样可以保证滚珠丝杠进给系统的刚度和精度。

(4) In addition, in the process of installing the ball screw, the axial movement of the ball screw needs to be strictly controlled, which will directly affect the transmission position accuracy of the ball screw into the system. According to the actual verification on site, firstly, the bearing in the bearing seat at the end of the servo motor shall be assembled and installed, which plays a major role in the transmission process of the rolling lead screw, and the axial movement of the ball lead screw shall be controlled between 0.015 ~ 0.02; Then, assemble the bearing in the bearing seat at the other end to control the axial movement within 0.01. This can ensure the stiffness and accuracy of the ball screw feed system.

(5)滚珠丝杠轴的预拉伸也是非常必要的。为了提高滚珠丝杠进给系统的刚度和精度，对丝杠轴进行预拉伸是非常有用的。但由于丝杠轴截面不同，温值不易精设置，根据相关文献计算的预拉力只能作为参考。在生产中，目标值为负的丝杠轴经常被预拉伸，使机床工作台的定位精度曲线接近水平。

(5) Pre stretching of ball screw shaft is also very necessary. In order to improve the stiffness and accuracy of the ball screw feed system, it is very useful to pre stretch the screw shaft. However, due to the different sections of the lead screw shaft, the temperature value is not easy to be accurately set, and the pretension calculated according to the relevant literature can only be used as a reference. In production, the lead screw shaft with negative target value is often pre stretched, so that the positioning accuracy curve of the machine tool workbench is close to the horizontal.

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