Ball screw installation new technology:

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Ball screw installation new technology:

Release time：

2023-02-15

1. First, use the integral special mandrel to correct the hole of the screw nut seat so that the positive and lateral parallelism with the reference guide rail is within 0.01/1000; 2. After fixing the screw nut seat, use a professional measuring fixture for actual
measurement The positive and lateral distance between the hole of the threaded female seat and the reference guide rail; then, also use the integral special inspection rod to find the positive and lateral parallelism between the bearing hole and the reference guide rail within 0.01/1000, and use the special measuring fixture for actual
measurement The positive and lateral distance between the bearing hole and the reference guide rail requires the same positive and lateral distance between the screw nut hole and the reference guide rail, and the tolerance is 0.01; fix the bearing seat.
This method uses an integral special inspection rod, which does not have a short length, and combines the mandrel and the positioning sleeve into one, eliminating the cooperation gap between the mandrel and the positioning sleeve, and reliably ensuring the bearing hole and screw nut seat hole. Parallelism with the guide rail;
3. By measuring the actual distance, the coaxiality of the bearing support holes at both ends and the screw nut seat hole is also reliably guaranteed, which reduces the winding degree and radial direction of the ball screw pair. The offset load improves the installation accuracy of the screw pair.
4. In addition, in the process of installing the ball screw, the axial movement of the ball screw must be strictly controlled. This technical index will directly affect the transmission position accuracy of the ball screw feed system.
According to the field practice verification, it is shown that: first, the bearing in the bearing seat installed at the end of the servo motor must be installed, which plays an important role in the transmission process of the ball screw, and the axial movement of the ball screw is controlled
between ; Then, install the bearing in the bearing seat at the other end so that the axial movement is controlled within 0.01. In this way, the rigidity and precision of the ball screw feed system can be effectively guaranteed.
5. The pre-stretching of the ball screw shaft is also very necessary. In order to improve the rigidity and precision of the ball screw feed system, it is very effective to pre-stretch the screw shaft, but because the cross-sections of the screw shaft are different, and the temperature rise value is
not easy The calculated pre-tension force can only be used as a reference. In production, the screw shaft with the target value in the negative direction is often pre-stretched, so that the positioning accuracy curve of the machine tool table is close to
the level.

HONGQI PRECISION