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

Abstract

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.

Description

technical field [0001] The invention relates to a heavy-duty machine tool open-type static pressure rotary worktable and its rotary centering shaft structure in mechanical manufacturing equipment. technical background [0002] The development of modern CNC machine tools tends to be more and more high-speed, high-precision, and heavy-duty. As a key accessory of heavy-duty machine tools, the rotary table is also facing the requirement of heavy-duty development. As the structural performance of the guide rail pair and the bearing structure part that realizes the rotary motion of the CNC rotary table, it plays an important role in ensuring the motion accuracy and performance indicators of the table. The structure of the hydrostatic guideway based on the principle of hydrostatic pressure has many advantages such as high load capacity, extremely small friction coefficient, high rigidity, and good precision retention, so it is more and more used in the design of machine tool produc...

AI Technical Summary

Problems solved by technology

The traditional open static pressure guide rail turntable structure is generally only designed as a single-direction load-bearing form-that is, the guide rail support is formed by the liquid static pressure medium opposite to the load direction of the workpiece, and the static pressure method is mainly constant pressure static pressure; the disadvantage is that the static pressure The amount of pressure float changes greatly with the change of external load, the rigidity of the oil film is poor, and it is difficult to form the oil film of the static pressure guideway

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