Transmission assembly and numerical control machine tool

Abstract

The invention discloses a transmission assembly and a numerically controlled machine tool. The transmission assembly includes a lead screw, a first bearing assembly and a first lock nut arranged at one end of the lead screw, and a second bearing assembly arranged at the other end of the lead screw. A lock nut, a second bearing assembly, and a third lock nut; the first bearing assembly includes two first angular contact bearings installed back-to-back; the second bearing assembly includes two second angular contact bearings installed back-to-back . According to the technical solution of the present invention, two angular contact bearings installed back-to-back are respectively provided at both ends of the lead screw to effectively support the lead screw, thereby reducing the vibration and deformation of the lead screw; The amount of pre-tensioning can effectively alleviate the deformation of the lead screw due to thermal expansion, thereby improving the processing accuracy.

Description

technical field [0001] The invention relates to the field of mechanical processing equipment, in particular to a transmission assembly and a numerically controlled machine tool. Background technique [0002] In the CNC machine tool, the worktable, Y-axis, and Z-axis are all driven by motors with screw rods, and the movement is controlled by the screw rods. There is an inseparable relationship between the three-axis screw and the machining accuracy of the entire machine tool. [0003] In the existing three-axis screw rod of CNC machine tools, because the screw rod is always moving, the screw rod itself also has weight, which will droop, deform and vibrate during the movement; moreover, heat will be generated during the movement process, which will increase the temperature of the screw rod and cause thermal expansion. As a result, the machining accuracy of the machine tool is reduced, which has a great impact on the accuracy of the machine tool. Contents of the invention ...

AI Technical Summary

Problems solved by technology

[0003] In the existing three-axis screw rod of CNC machine tools, because the screw rod is always moving, the screw rod itself also has weight, which will droop, deform and vibrate during the movement; moreover, heat will be generated during the movement process, which will increase the temperature of the screw rod and cause thermal expansion. It leads to a decrease in the machining accuracy of the machine tool and has a great impact on the accuracy of the machine tool.

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