SU1175610A1 - Radial hydroststic support of the spindle unit - Google Patents

Abstract

RADIAL HYDROSTATIC SUPPORT OF THE SPINDLE KNOTE, comprising a housing, a quill with radial holes installed in the bore of the hull, an annular manifold supplying lubricant to the radial holes of the quill, vptol-. worn between the quill and the housing, Jt rAtfs wr. - “J l; h. The bore is installed in the bore of the quill, while the sleeve has carrier pockets and radial channels to supply lubricant pockets, hydraulic resistors located between the collector and carrier pockets, so that, in order to increase the rigidity and reliability of hydrostatic supports by fine-tuning the input hydrodynamics and. increasing the flow lines of the throttling channels by increasing their length, hydroresistances are made in the form of annular grooves of the same length on the sleeve surface, the number of grooves (L is equal to the number of pockets, and each groove is open by bridges around the circumference and separated from other grooves along the axis, and the beginning of each groove is aligned with the radial hole in the quill, and the end with the radial channel for supplying the lubricant to the carrying pocket - eats a sleeve, which is installed with the possibility of angular rotation in the quill Od setting hydraulic resistance.

Description

111 The invention relates to mechanical engineering and can be used in machine-tool construction for supports of grinding spindles, for example, in grinding machines, a grinding wheel which performs a rotary and axial oscillating movement. The aim of the invention is to increase the rigidity and reliability of the hydrostatic support by fine-tuning the input hydroresistances and increasing the flow sections of the throttling channels by increasing their length. FIG. 1 shows the radial support of the spindle assembly; in fig. 2, section A-A in FIG. one; in fig. 3 shows a section B-B in FIG. one; in fig. 4 - p-cut BB in FIG. one; in fig. 5 - bit G - D in FIG. one; in fig. 6 - spindle grinding machine. The radial hydrostatic support comprises a body 1 with a quill 2 installed in it (Fig. 1). The casing has an annular collector 3 and a channel 4 for supplying lubricant. The collector 3 is sealed with sealing rings 5. The quill 2 has radial holes 6 (Fig. 2-5) extending into the collector 3, and is installed with the possibility of angular rotation of the sleeve 7 (Fig. 1), in which the radial channels 8 are filled the supply for supplying lubricant to the pockets 9. The number of holes 6 in the quill 2 is equal to the number of pockets 9. On the outer surface 10 of the sleeve 7 there are annular throttling grooves 11 in an amount equal to the number of pockets 9. Each groove connects the channel 8 of the pocket 9 with a corresponding blind hole 12. (FIG. 2 and 3), made on the outer surface 10 of the sleeve 7 opposite the radial hole 6 in the quill holes 2. Jumpers 13 separate the beginning and the end of each throttling groove 11, and the lengths of all the grooves 11 between the blind hole 12 and the radial channel 8 are equal. The bars 14 separate the grooves from each other and from the internal cavities of the peg-piece unit. & the zone of bridges 13 and 14 between the outer surface 10 of the sleeve 7 and the interface I Lnoli 2 adjoining it is minimal; it ensures the collection of the assembly, but excludes the cross flow 2 ki between the cavities with different lubricant pressures on the bearing parameters. The holes 15 in the sleeve 7 provide pressure control in the pockets 9. The spindle 16 is mounted in the sleeve 7 with a clearance D with the possibility of rotation and axial movement. The radial hydrostatic support of the spindle assembly operates as follows. Through the channel 4, the lubricant is fed under pressure into the annular manifold 3 and through the radial holes 6 through the throttling grooves 11 enters the carrier pockets 9. Due to the hydrostatic effect, the spindle 16 is centered in the support. However, the flow areas of the throttling grooves 11 and the gaps D between the spindle 16 and the sleeve 7 cannot be performed without deviations from the calculated values. At the same time, the hydraulic resistance of the throttling grooves 11 will not be equal to the hydraulic resistance to the outflow of lubricant from the bearing pockets 9. Since, if these resistances are equal, the support stiffness is greatest, the resistances at the entrance to the pockets 9 are adjusted by changing the length of the working part of the throttling grooves 11 by rotating the sleeve 7 clockwise (Fig. 2-5). In this case, for all pockets 9, the input resistance is linearly reduced by the same value. After tuning, the sleeve 7 should be hatched relative to the quill 2. The pinola 2 can be rotated to orient the pockets 9 of the sleeve 7 with respect to the direction of the acting forces and fixed relative to the body 1. The spindle 16 can perform a rotational and translational, for example, oscillating motion. The significant length of the throttling grooves ensures high dynamic qualities of the support and a linear change in the resistance with pa3BoifoTe bushings, which allows precise adjustment of the input hydrodynamics and the highest rigidity of the hydrostatic .onopF.i, FIG. 6 shows an example of a spindle assembly of a sharpening machine having a spindle 16 on radial hydrostatic bearings, a grinding wheel 17, a pulley 18 and mechanical

311756

oscillation 19, performed by an eccentric 20, which is rotated from the drive of the machine, transmitting through the lever 21 and the angular contact bearing oscillating j movement to the spindle 16. The spindle 16 is pressed against the eccentric 20 in the axial direction by means of a spring 23.

The lubricant is supplied to the supports by means of unions 24 into a pin (about the lecturer 3 and through the radial holes 6 quill 2 into the blind holes 12 of the sleeves 7, then along the throttle channel 11B the channels 8 supply the lubricant and into the pockets 9. Grease from the pockets 9 you - 15 flows through output chokes 25 and further along fittings 26 into the drain.

10. 4

When throttling grooves 11 were made, a bronze bushing 7 with a final hole, pockets 9, radial channels 8 of the lubricant supply and blind holes 12 was mounted on a mandrel fixed in the chuck of the turning stock with the support on the rear center. The throttling grooves 11 are filled with the same cutter to the design depth from the radial channel 8 to the blind hole 12. The choking grooves cut by the tachsh i method ensured the radial beating of the spindle neck within 2 microns, which corresponds to the accuracy of the spindle manufacturing.

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Claims (1)

RADIAL HYDROSTATIC BRACKET OF A SPINDLE ASSEMBLY, comprising a housing, a quill with radial holes installed in the housing bore, an annular manifold for supplying lubricant to the radial holes of the quilt made between the quilt and the housing, a sleeve installed in the boring of the quill, while in the sleeve there are made bearing pockets channels for supplying lubricant to the bearing pockets, hydraulic resistance, located between the collector and the bearing pockets, characterized in that, in order to increase the stiffness and reliability of the hydrostatic supports by fine-tuning the input resistance and. increase feedthrough lines throttling channels by increasing their length, hydraulic resistance are formed as annular grooves odina- _Λ kovoy length on the outer surface of the sleeve S, the number of grooves equal to the number of pockets, and each groove is open webs and circumferential grooves separated from other axially and the beginning of each groove is combined with a radial hole in the pins, and the end with the radial channel for supplying lubricant to the bearing pocket of the sleeve, which is installed with the possibility of angular rotation in the pins with us top three hydraulic resistance. SU „., 1175610