Double-division auxiliary static-pressure bearing and turning worktable of machine tool

Abstract

The invention relates to a double-division auxiliary static-pressure bearing and turning worktable of a machine tool, comprising a box body, a supporting ring, a circular ring pressure plate, a mandrel, a driving worm, a damping worm, a worm wheel and a table top, wherein the supporting ring is fixedly arranged on the upper end surface of the box body, one end of the mandrel is inserted into a central through hole of the supporting ring and connected with the table top into a whole, the circular ring pressure plate is arranged between the table top and a mandrel contact surface, oil grooves which are communicated with an external pressure oil pipe are evenly distributed on contact surfaces among the supporting ring, the table top, the mandrel and the circular ring pressure plate, and an oil film with a thickness of 2-4 micrometers is quickly and evenly generated between two turning surfaces which are in mutual contact by regulating oil pressure in the oil grooves so as to support and lubricate the turning surfaces. The double-division auxiliary static-pressure bearing and turning worktable has reasonable and simple structure, smooth running, high rotating speed, good rigidity, low exotherm, good precision maintenance and reliable operation, is easy to process and manufacture, can obviously increase the processing precision of workpieces and is suitable for being matched with different types of gear hobbing machines.

Description

technical field [0001] The invention relates to a double indexing pair rotary table for machine tools, in particular to a double indexing pair static pressure support rotary table for machine tools. Background technique [0002] The rotary table of traditional gear hobbing machine generally adopts: the centripetal thrust roller bearing and the sliding bearing cooperate to realize the axial and radial positioning and rotary support of the mandrel. See attached figure 1 , the traditional gear hobbing machine rotary table includes a box 2, a support ring 8, a mandrel 1, a worm wheel 5, a driving worm 6, a damping worm 7, an adjusting ring 4, a table 9, a radial thrust roller bearing 10, and a sliding bearing 3; The support ring 8 is installed on the box body 2; the worm wheel 5 is fixed on the mandrel 1; the driving worm 6 and the damping worm 7 are installed in the box body to mesh with the worm wheel 5; a table 9 is installed on the The mandrel 1 is on the upper end surface...

AI Technical Summary

Problems solved by technology

See attached figure 1 , the traditional gear hobbing machine rotary table includes a box 2, a support ring 8, a mandrel 1, a worm wheel 5, a driving worm 6, a damping worm 7, an adjusting ring 4, a table 9, a radial thrust roller bearing 10, and a sliding bearing 3; The support ring 8 is installed on the box body 2; the worm wheel 5 is fixed on the mandrel 1; the driving worm 6 and the damping worm 7 are installed in the box body to mesh with the worm wheel 5; a table 9 is installed on the The mandrel 1 is on the upper end surface of the box body 2; the outer circumference of the upper end of the mandrel 1 is provided with a centripetal thrust roller bearing 10 and the support ring 8 to realize the radial positioning of the upper end of the mandrel 1; The lower end of the mandrel 1 is a cone on which the sliding bearing 3 and the centripetal thrust roller bearing 10 are arranged. The position of the thrust roller bearing 10 on the cone at the lower end of the mandrel 1 realizes the axial and radial positioning of the mandrel 1; although the rotary table with this structure has the advantages of reasonable structure and high precision, However, due to the defects of the tapered sliding bearing structure itself, during use, the tapered sliding bearing wears a lot, the temperature rises, and the precision retention is poor, which leads to the reduction of the machining accuracy of the whole machine and affects the precision of the gear machining.

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