Open-type static pressure rotating table for controlling floating degree and manufacturing method thereof

The invention relates to an open-type static pressure rotating table for controlling floating degree and a manufacturing method thereof. The open-type static pressure rotating table is characterized in that: a column on the lower part of a rotary table body and the inner hole of a large gear ring forms clearance fit by a coaxial basic hole system; the large gear ring and the table are arranged ona slide carriage, and the bottom surface of the large gear ring with high planeness and roughness and a static pressure oil chamber on the upper surface of the slide carriage form a hydrostatic pressure guide rail pair; an additional axial thrust bearing structure arranged on a centering structure provides preloads for hydrostatic pressure guide rails of the table; and the bottom surface of the large gear ring is assembled and ground correctly according to design requirements till plane precision, and the upper surface of the static pressure oil chamber on the slide carriage is scraped by facing-up simultaneously to ensure the fit accuracy of the upper and lower hydrostatic pressure guide rails. In the open-type static pressure rotating table, the thrust bearing structure is adopted on the basis of a common centering shaft structure, so the initial preloads of the hydrostatic pressure guide rail pair are controlled effectively and the floating degree of the open-type static pressure rotary table is controlled effectively, the rigidity of an oil film is increased, and the motion stability, motion accuracy and unbalance load-resistant capacity of the open-type static pressure rotarytable are improved.