CN2696746Y

CN2696746Y - Heavy load beared static pressure spindle bearing device

Info

Publication number: CN2696746Y
Application number: CN 200420039871
Authority: CN
Inventors: 韩晓红; 贾会述; 孙永年; 包鹏超
Original assignee: Jier Machine Tool Group Co Ltd
Current assignee: Jier Machine Tool Group Co Ltd
Priority date: 2004-04-23
Filing date: 2004-04-23
Publication date: 2005-05-04
Anticipated expiration: 2014-04-23

Abstract

The utility model relates to a heavy load static pressure main shaft bearing device, which is applied to the main shaft bearing structure with high accuracy of large-scale digital control floor type boring and milling machines and machining centers. The heavy load static pressure main shaft bearing device comprises a ram, a front static pressure bearing, a rear static pressure bearing and a boring rod. The front static pressure bearing and the rear static pressure bearing are fixed inside the ram; the boring rod is supported by the front static pressure bearing and the rear static pressure bearing. The heavy load static pressure main shaft bearing device is characterized in that the inner sides of the front static pressure bearing and the rear static pressure bearing are provided with an oil recess at the axial direction and a return chute at the circumferential direction, and the oil recess is connected with the inlet of a pressure oil by a flow regulating valve. The heavy load static pressure main shaft bearing device has advantages of large contact area, non-gap and high rotation accuracy; the telescopic movement is gapless with favorable linearity; the rotation speed is enhanced, and the radial stiffness of the oil film is high; the heavy load static pressure main shaft bearing device also has excellent shock and vibration absorption performance, strong reliability and it is zero friction; the boring rod has high run location accuracy with controlled temperature rise.

Description

Heavy duty hydrostatic spindle bearing arrangement

(1) technical field under

The utility model relates to a kind of heavily loaded hydrostatic spindle bearing arrangement, particularly a kind of heavily loaded hydrostatic spindle bearing arrangement that is applicable to the numerical control floor milling-boring machine.

(2) background technology

When common boring machine bore hole, to the hole that the position degree is had relatively high expectations, the processing of its technological problems is the problem of difficulty relatively often.Because the gap of rolling bearing in the traditional mechanical type boring bar guided bearing system, the deviation from circular from of the contact raceway of housing washer, the deviation from circular from of bearing inner race, the gap of sliding guide sleeve and boring bar all has influence on the crudy of workpiece, makes precision be difficult to assurance.Therefore, traditional process is that the D level single row angular contact ball bearing that will be installed in the boring bar guided bearing system carries out grouping mea-sure and apolegamy, be used for eliminating bearing, the inconsistent caused error of the guide pin bushing circular runout and the direction of beating, and also to carry out necessary reconditioning and adjustment when installing, make the pretightning force of bearing just right, otherwise be difficult to produce a desired effect.Make complex process like this, assembly difficulty increases, and the process-cycle prolongs, and manufacturing cost improves.

(3) summary of the invention

The utility model provides a kind of heavily loaded static pressure spindle device in order to overcome the deficiency of above traditional mechanical type boring bar technology, compares traditional mechanical type boring bar and has that contact area is big, no gap, rotating accuracy height; Stretching motion does not have the gap, linearity is good; Speed of gyration improves; Oil film radial rigidity height, absorbing is good; Good reliability does not have friction; Boring bar motion positions precision height, the controlled advance that waits of temperature rise.

The utility model is realized by following measure:

The utility model discloses a kind of heavily loaded static pressure spindle device, the boring bar that comprises ram, is fixed on preceding hydrostatic bearing in the ram and back hydrostatic bearing, supports by preceding hydrostatic bearing and back hydrostatic bearing, its special feature is: the inboard of preceding hydrostatic bearing and back hydrostatic bearing has axial oil pocket and circumferential oil-recovery tank, and oil pocket links to each other with the pressure oil import by choke valve.

Heavily loaded static pressure spindle device of the present utility model, it further improves and is, a thin-walled reinforcing plate structure is arranged between preceding hydrostatic bearing and the ram, and the oil film checkout gear that is used to detect oil pressure is installed on the oil circuit of preceding hydrostatic bearing.

Heavily loaded static pressure spindle device of the present utility model utilizes the oil pressure in the oil pocket to regulate the position of boring bar automatically, thereby guarantees that boring bar is positioned at the center of bearing static pressure cover all the time, compares traditional mechanical type boring bar and has that contact area is big, no gap, rotating accuracy height; Stretching motion does not have the gap, linearity is good; Speed of gyration improves; Oil film radial rigidity height, absorbing is good; Good reliability does not have friction; Boring bar motion positions precision height, the controlled advance that waits of temperature rise.

(4) description of drawings

Fig. 1 is the structural representation of utility model

Fig. 2 is preceding hydrostatic bearing static pressure principle schematic

Fig. 3 is a back hydrostatic bearing static pressure principle schematic

Among the figure, 1, the oil film checkout gear, 2, ram, 3, coupling sleeve, 4, boring bar, 5 rear bearing pressure oil imports, 6, preceding hydrostatic bearing, 7, the thin-walled reinforcing plate structure, 8, choke valve, 9 fore bearing pressure oil imports, 10 back hydrostatic bearings

(5) specific embodiment

The utility model hydrostatic spindle bearing arrangement as shown in Figure 1, the operation principle of its forward and backward hydrostatic bearing is as shown in Figures 2 and 3.

The utility model mainly comprises boring bar 4, ram 2, preceding hydrostatic bearing 6, back hydrostatic bearing 10, choke valve 8, oil film checkout gear 1.Its main feature is: forward and backward hydrostatic bearing is fixed on the ram 2, and boring bar 4 is supported by forward and backward hydrostatic bearing; Rear bearing pressure oil import 5 is the pressure oil import of back hydrostatic bearing 10, has three places; The pressure oil import of hydrostatic bearing 6 before the fore bearing pressure oil import 9 is assigned to preceding hydrostatic bearing 6 each oil pocket (structure is seen Fig. 1) by coupling sleeve 3 with pressure oil.In this hydrodynamic journal liquid polymers system, preceding hydrostatic bearing 6 is divided into two sections of front and back for adopting the four oil pocket orifice restriction hydrostatic bearings that circumferential oil-recovery tank is arranged, and every section is divided into four oil pockets, totally eight oil pockets; Back hydrostatic bearing 10 is divided into three oil pockets for adopting the three oil pocket orifice restriction hydrostatic bearings that circumferential oil-recovery tank is arranged.Pressure oil forms damping during through the choke valve 8 in each static pressure chamber, produces pressure drop, enter the oil closed cavity of symmetry after, boring bar is floated.Because choke valve 8 produces dampings, makes oil pocket possess stronger rigidity, when symmetrical oil pocket gap not simultaneously, the oil pocket increased pressure that the gap is little, the big oil pocket pressure in gap reduces, thereby guarantees that boring bar is positioned at the center of bearing static pressure cover all the time.The fore bearing static pressure is set with four groups of oil film checkout gears 1, and uses the leakage that the pressurized seal technology effectively and simply stops static pressure oil.Boring bar stretches and when rotatablely moving, by the thin-walled reinforcing plate structure 7 of fore bearing matrix, regulates the hydrostatic spindle attitude voluntarily according to boring bar 4 force-bearing situations, to keep its good operation and machining accuracy.

In a word, the utility model heavy duty hydrostatic spindle bearing arrangement, advanced design is outstanding, used the modern designs technology, simplified complicated assembly technology, and precision stability is good, the reliability height is the high accuracy spindle bearing structure that is applicable to large-sized numerical control floor type boring and milling machine and machining center.

Claims

1. heavily loaded static pressure spindle device, comprise ram (2), be fixed on preceding hydrostatic bearing (6) in the ram (2) and back hydrostatic bearing (10), by the boring bar (4) of preceding hydrostatic bearing and back hydrostatic bearing support, it is characterized in that: the inboard of preceding hydrostatic bearing (6) and back hydrostatic bearing (10) has axial oil pocket and circumferential oil-recovery tank, and oil pocket links to each other with the pressure oil import by choke valve (8).

2. heavily loaded static pressure spindle device according to claim 1 is characterized in that: a thin-walled reinforcing plate structure (7) is arranged between preceding hydrostatic bearing (6) and the ram (2), the oil film checkout gear (1) that is used to detect oil pressure is installed on the oil circuit of preceding hydrostatic bearing.

3. heavily loaded static pressure spindle device according to claim 1 and 2 is characterized in that: hydrostatic bearing (6) divides two sections before described, and every section is four oil pockets of symmetry; Back hydrostatic bearing (10) is three oil pockets of symmetry.