How to install a ball screw on a double-head precision cutting saw for aluminum profiles

To achieve accurate coordinate positioning in a double-head precision cutting saw for aluminum profiles, reduce lead screw deflection, prevent radial and offset loads, minimize temperature rise and thermal deformation in all parts of the lead screw, maximize the transmission torque of the servo motor, and improve the reliability of continuous machine tool operation, it is crucial to enhance the installation accuracy of the ball screw assembly on the machine tool.

The traditional method of installing the ball screw assembly involves using a mandrel and locating sleeve to connect and align the end supports and the intermediate lead screw nut. A dial indicator is used to align the mandrel axis parallel to the machine tool guide rail, ensuring smooth and easy mandrel transmission. This method is suitable for small CNC machine tools and machining centers with small strokes in the three-axis direction and is easy to use. However, because there are clearances between the mandrel and locating sleeve, between the locating sleeve and the bearing holes of the end supports, and the intermediate lead screw nut hole, the coaxiality error between the bearing holes and the lead screw nut hole after installation is significant. This results in a series of serious consequences, including increased lead screw deflection, increased radial offset load, increased temperature in all parts of the lead screw system, increased thermal deformation, and increased transmission torque. Consequently, this can lead to servo motor overload, overheating alarms in the servo system, and disruption of normal operation. Furthermore, the inability to accurately measure the actual difference between the bearing holes at both ends and the intermediate screw nut hole affects further adjustments.

CNC Double-Head Precision Saw

For CNC machine tools like double-head precision cutting saws for aluminum profiles, which have large strokes, strict control of the axial movement of the ball screw is crucial during installation. This technical indicator directly affects the transmission position accuracy of the ball screw feed system. Field practice has verified the following: First, the bearing housing installed in the bearing seat at the servo motor end must be properly assembled. This is the main function of the ball screw transmission process, controlling the axial movement of the ball screw between 0.015 and 0.02. Then, the bearing in the bearing housing at the other end is assembled, ensuring the axial movement is controlled within 0.01. Therefore, the rigidity and accuracy of the ball screw feed system can be effectively guaranteed. Pre-tensioning of the ball screw shaft is also performed. To improve the rigidity and accuracy of the ball screw feed system, the screw shaft is pre-stretched.