Twin-spindle vertical machining center is a machine tool with two sets of high spindles in the Z direction and adjustable spindle center distance in the X-axis direction on the headstock. The headstock mounted on the column moves up and down the Z-direction guide rail accurately to realize the movement of the spindle and to complete the Z-direction movement requirements of the workpiece processing. Due to the double spindle configuration of the main shaft component, the no-load and load of the Z-axis lead screw are doubled, so it is necessary to make a counterweight to balance the lead screw load. The balance system of the spindle box is the core part of the double spindle machining center, which directly affects the machining accuracy. Generally, to reduce the no-load torque and wear of the ball screw, and ensure the accuracy of the screw and the accuracy of the machine tool, it is necessary to balance the weight of the spindle box and spindle. In this study, the advantages and disadvantages of various counterweight technologies are compared, and the counterweight method suitable for this product is selected to ensure the accuracy of the machine tool.
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