Abstract
This study proposes a method to reduce the displacement fluctuation of hydrostatic lead screw feed systems under ultralow velocity and subjected to different loads by means of a dual-drive hydrostatic screw-nut pair (DDHSNP). The differential compound principle of DDHSNP and the wedge-shaped oil film gap are used to generate the hydrodynamic effect of lubricating film while ensuring the worktable is fed at extremely low speed. After that, the model of the DDHSNP, considering the pitch errors and nut posture errors, is established based on the equation of motion, the Reynolds equation, and the Euler equation. Finally, a comparative experiment is conducted to demonstrate the effectiveness of the proposed method. The results indicate that: (a) The nut's posture errors have little effect on the displacement fluctuation of the hydrostatic lead screw feed system. (b) The DDHSNP can significantly reduce the displacement fluctuation of the hydrostatic lead screw feed system under variable loads and low speeds. This research is an excellent improvement for the superior motion characteristics of the hydrostatic lead screw at low speed.
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