What is the meaning of prestretching for CNC lathe ball screw installation?

The prestretching of the ball screw installation of CNC lathe refers to that when the ball screw is installed, certain measures are taken to make the ball screw produce a certain prepressure or pretension in the assembly process.

A ball screw is a commonly used transmission element in CNC machine tools, which transmits motion and force through rolling contact between the ball and threaded sleeve. To ensure the normal operation and high-precision performance of the ball screw, it is necessary to pre-stretch it during installation.

The purpose of pre-stretching is twofold:

Eliminate the clearance of the ball screw: After the ball screw is installed, if it is not pre-stretched, there will be a certain clearance, that is, the gap between the ball and the thread sleeve. The clearance will affect the positioning accuracy and rigidity of CNC machine tools. By pre-stretching, the clearance can be eliminated, and the rigidity and positioning accuracy of the ball screw can be improved.

Improve the transmission efficiency of the ball screw: Pre-stretching can also improve the transmission efficiency of ball screws. When the ball screw is subjected to pre-tension, the rolling contact between the ball and the threaded sleeve becomes tighter, and the friction is reduced, thereby reducing energy loss and heat generation, and improving transmission efficiency.

The specific pre-stretching method and strength should be carried out by the requirements of the ball screw manufacturer. Under normal circumstances, pre-drawing is achieved by making appropriate adjustments to the bearings at both ends of the ball screw. In the installation, according to the specifications and requirements of the ball screw, the bearing position and fastening strength are precisely adjusted, so that the ball screw is subjected to the appropriate pre-tension.

It should be noted that excessive pre-stretching may cause deformation or damage to the ball screw, so when pre-stretching, it is necessary to grasp the appropriate strength and follow the corresponding operating procedures. It is good to carry out the pre-stretching operation under the technical information and guidance provided by the ball screw manufacturer.

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