Compound type rotary supporting device for machine tool round workbench

Abstract

The invention discloses a compound type rotary supporting device for a machine tool round workbench, which comprises a workbench, a rotary main shaft, an axial static-pressure supporting component and a rolling bearing. The compound type rotary supporting device is characterized in that the upper part of the rotary main shaft is provided with an axial plane annular closed static-pressure round guide rail support which bears axial loads, the middle part of the rotary main shaft is provided with the rolling bearing which bears radial loads, and both the guide rail support and the rolling bearing form a static-pressure and rolling compound type rotary support; the closed static-pressure round guide rail support comprises an upper press ring, a middle spacing ring arranged below the upper press ring and a lower shell arranged below the middle spacing ring, and the upper press ring, the middle spacing ring and the lower shell are connected into a whole; the lower plane of the upper press ring and the upper plane of the lower shell form an upper sealing combination surface and a lower sealing combination surface with the middle spacing ring, and a pressure bearing surface of the guide rail support which corresponds to the rotary main shaft is provided with a static-pressure oil cavity; the rolling bearing is a rolling bearing of a cylinder roller or an equivalent combination of the rolling bearing. The compound type rotary supporting device has the advantages of large bearing capacity, high moving precision and long service life and has short rotary main shaft, simple and compact structure, low manufacturing and using cost, convenient maintenance and high supporting rigidity.

Description

technical field [0001] The invention relates to machine tool processing equipment, in particular to an improvement of a rotary support structure of a machine tool circular workbench. Background technique [0002] There are many types of rotary support structures for the circular worktable of the existing machine tool equipment. There are axial and radial bearings that are supported by rolling bearings. Sliding bearings, the radial direction is the structural form of rolling bearings, which have low motion accuracy but heavy load; some axial and radial bearings are supported by hydrostatic bearings, which have a long service life, but the structure is large and the manufacturing cost is high. These support forms are: Their respective characteristics and applicable occasions. [0003] Analyzing the support form of static pressure technology, the static pressure guide rail technology is used to bear the axial force of the round table of the machine tool. At present, the open s...

AI Technical Summary

Problems solved by technology

[0002] There are many types of rotary support structures for the circular worktable of the existing machine tool equipment. There are axial and radial bearings that are supported by rolling bearings. Sliding bearings, the radial direction is the structural form of rolling bearings, which have low motion accuracy but heavy load; some axial and radial bearings are supported by hydrostatic bearings, which have a long service life, but the structure is large and the manufacturing cost is high. These support forms are: Their respective characteristics and applicable occasions

[0003] Analyzing the support form of static pressure technology, the static pressure guide rail technology is used to bear the axial force of the round table of the machine tool. At present, the open static pressure guide rail structure is more common. This structure has only one-sided oil film support, and its rigidity is not as good as that of double-sided hydraulic guide rails. Closed hydrostatic guideway with oil film on the surface

The closed static pressure guide rails are now commonly used only on linear guide rails; more radial bearings are used for support. From the theoretical analysis of static pressure support, the existing technical structure is not sensitive to subtle load changes. The duplication phenomenon of workpiece error will occur, and the rigidity is not as good as that of rolling bearings when there is a slight change

Compared with the radial rolling bearing structure, the manufacturing cost and maintenance cost are high, and the structure volume is large

[0004] In the use of rolling bearings, rolling bearings are used in the axial and radial directions, and ball bearings are generally used in the general structure; there are machine tool circular worktables that use rolling bearings alone in the radial direction and sliding guide rails in the axial direction, and the rolling bearings also use ball bearings or ball bearings and ball bearings. The combination of other bearings, the support rigidity of this type of structure does not meet the high rigidity requirements of precision machine tools

Images