CN104070450A - Static pressure electric spindle headstock clamping device for ultra precision ball bearing ring grinding - Google Patents

Abstract

The invention discloses a static pressure electric spindle head frame clamping device for superfine grinding ball bearing ring grinding, which comprises a head frame frame, a main shaft, a front hydrostatic bearing, a rear hydrostatic bearing, a stator and a rotor. The stator is fixed in the head frame frame, the rotor is fixedly set on the main shaft, the main shaft is set in the head frame frame, the front end of the main shaft is supported by the front hydrostatic bearing, the rear end of the main shaft is supported by the rear hydrostatic bearing, and the rear hydrostatic pressure There is a rear bearing seat between the bearing and the headframe frame, a rear end cover is installed at the rear end of the rear hydrostatic bearing, and an adjusting pad for adjusting the thrust gap is installed between the rear hydrostatic bearing and the rear end cover , the front end of the spindle protrudes from the head frame, and is equipped with a magnetic pole mounting seat. The magnetic pole mounting seat is provided with a magnetic pole plate for fixing the superfine grinding ball bearing ring. The front of the magnetic pole plate is provided with a The support for the radial positioning of the ultra-fine grinding ball bearing ring has high rotation precision, small runout of the end surface, good shock absorption performance and high processing precision.

Description

Clamping device for static pressure electric spindle headstock for grinding ultra-precision ball bearing rings

technical field

The invention relates to the grinding processing technology of a superfine grinding ball bearing ring, in particular to a static pressure electric spindle head frame clamping device for grinding a superfine grinding ball bearing ring.

Background technique

Ultra-precision ball bearings are the core supporting components of high-speed machine tool spindles, aviation gyro systems, navigation systems, aero-engine rotor systems, etc., and their accuracy directly affects the operating accuracy, work efficiency and life of the equipment. To ensure the quality of super-precision ball bearings, the machining accuracy of the inner and outer ring grooves of the bearing must be guaranteed first, including the arc error, roundness, and groove position of the groove.

The existing bearing ring processing grinding machine generally adopts the clamping structure and method of the bracket and the belt-driven rolling bearing type spindle headstock, which has the following disadvantages: 1. The belt-driven workpiece spindle system will introduce the vibration of the drive motor and the belt system , leading to instability in the grinding process, resulting in grinding vibration marks when grinding the ferrule channel, affecting the surface processing quality of the channel and the error of the roundness of the groove, etc.; 2. The damping and shock absorption performance of the rolling bearing support structure is not ideal , It is also easy to introduce vibration; 3. There is contact wear in the working process of rolling bearings, and the fatigue life is short.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a hydrostatic electric spindle head with high rotation precision, small end surface runout, good shock absorption performance, and high machining precision for grinding ball bearing rings Rack clamping device.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A hydrostatic electric spindle headstock clamping device for ultra-fine grinding ball bearing ring grinding, including a headstock frame, a main shaft, a front hydrostatic bearing, a rear hydrostatic bearing, a stator and a rotor, and the stator is fixed In the head frame base, the rotor is fixedly set on the main shaft, the main shaft is set in the head frame base, the position of the rotor corresponds to the stator, the front end of the main shaft is supported by the front hydrostatic bearing, the front The front end of the hydrostatic bearing is provided with a front cover, and the rear end of the main shaft is supported by the rear hydrostatic bearing. A rear end cover is installed, an adjustment pad for adjusting the thrust gap is installed between the rear hydrostatic bearing and the rear end cover, the front end of the main shaft protrudes from the head frame frame, and a magnetic pole mounting seat is installed. The magnetic pole mounting seat is provided with a magnetic pole plate for fixing the superfine grinding ball bearing ring, and the front of the magnetic pole plate is provided with a support for radial positioning of the superfine grinding ball bearing ring around the superfine grinding ball bearing ring .

As a further improvement of the above technical solution:

There are two brackets, the angle between the two brackets is α, 90°≤α≤120°, and the angle between each bracket and the grinding point is less than 180°.

A water sealing jacket is provided between the stator and the frame of the head frame.

Compared with the prior art, the present invention has the advantages of:

The static pressure electric spindle head frame clamping device for ultra-fine grinding ball bearing ring grinding of the present invention adopts the front hydrostatic bearing and the rear hydrostatic bearing to support the main shaft, so that the rotation accuracy of the static pressure electric spindle head frame High, small end runout, good shock absorption performance, overcome the common shortcomings of large vibration, low precision, and short life in the existing belt-driven rolling bearing spindle system; through the bracket in front of the magnetic pole plate, the ultra-fine grinding Precise and stable radial positioning around the ring to ensure machining accuracy.

Description of drawings

Fig. 1 is a front view structural schematic diagram of the present invention.

Fig. 2 is a left view structure diagram of the present invention.

Each label in the figure means:

1. Head frame; 2. Main shaft; 3. Front hydrostatic bearing; 4. Rear hydrostatic bearing; 5. Stator; 6. Rotor; 7. Magnetic pole mounting seat; 8. Magnetic pole plate; 9. Front end cover ; 10, rear bearing seat; 11, adjusting pad; 12, rear end cover; 13, sealing water jacket; 14, bracket.

Detailed ways

Fig. 1 and Fig. 2 have shown the embodiment of the clamping device of the hydrostatic electric spindle headstock of a kind of superfinishing ball bearing ring grinding of the present invention, and this device comprises headstock frame 1, main shaft 2, front fluid Hydrostatic bearing 3, rear hydrostatic bearing 4, stator 5 and rotor 6, stator 5 is fixed in the head frame frame 1, a water sealing sleeve 13 is provided between the stator 5 and the head frame frame 1, and the rotor 6 is fixed in a suit On the main shaft 2, the main shaft 2 is set in the head frame frame 1, the position of the rotor 6 corresponds to the stator 5, the front end of the main shaft 2 is supported by the front hydrostatic bearing 3, and the front end of the front hydrostatic bearing 3 is provided with a front cover 9, the main shaft 2. The rear end is supported by the rear hydrostatic bearing 4. A rear bearing seat 10 is provided between the rear hydrostatic bearing 4 and the headframe frame 1. A rear end cover 12 is installed at the rear end of the rear hydrostatic bearing 4. An adjustment pad 11 for adjusting the thrust gap is installed between the hydrostatic bearing 4 and the rear end cover 12, the front end of the main shaft 2 protrudes from the head frame frame 1, and a magnetic pole mounting seat 7 is installed on the magnetic pole mounting seat 7. There is a magnetic pole plate 8 for fixing the superfine grinding ball bearing ring, and the front of the magnetic pole plate 8 is provided with a support 14 for radially positioning the superfine grinding ball bearing ring around the superfine grinding ball bearing ring. The hydrostatic electric spindle head frame clamping device for superfine grinding ball bearing ring grinding of the present invention adopts the front hydrostatic bearing 3 and the rear hydrostatic bearing 4 to support the main shaft 2, so that the static pressure electric spindle head frame It has high rotation precision, small end runout and good shock absorption performance, which overcomes the common shortcomings of large vibration, low precision and short life in the existing belt-driven rolling bearing workpiece spindle system; through the bracket 14 in front of the magnetic pole plate 8, the super Precise and stable radial positioning around the ball bearing ring is precisely ground to ensure machining accuracy.

In this embodiment, there are two brackets 14, the angle between the two brackets 14 is α, 90°≤α≤120°, and the angle between each bracket 14 and the grinding point is less than 180°.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent implementation of equivalent changes example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims (3)

1. the static pressure electric main shaft headstock clamping device of super grinding ball bearing race grinding, it is characterized in that: comprise headstock support (1), main shaft (2), front hydrodynamic journal liquid polymers (3), rear hydrodynamic journal liquid polymers (4), stator (5) and rotor (6), described stator (5) is fixed in headstock support (1), described rotor (6) fixed cover is loaded on main shaft (2), described main shaft (2) is set in headstock support (1), described rotor (6) is corresponding with stator (5) position, described main shaft (2) front end is by front hydrodynamic journal liquid polymers (3) supporting, described front hydrodynamic journal liquid polymers (3) front end is provided with drive end bearing bracket (9), main shaft (2) rear end is by rear hydrodynamic journal liquid polymers (4) supporting, between described rear hydrodynamic journal liquid polymers (4) and headstock support (1), be provided with rear bearing block (10), described rear hydrodynamic journal liquid polymers (4) rear end is equiped with rear end cap (12), between described rear hydrodynamic journal liquid polymers (4) and rear end cap (12), be equiped with the adjusting pad (11) for adjusting thrust gap, described main shaft (2) front end stretches out headstock support (1), and be equiped with magnetic pole mount pad (7), described magnetic pole mount pad (7) is provided with the pole plate (8) for fixing super grinding ball bearing race, described pole plate (8) front is provided with the support (14) to the radial location of super grinding ball bearing race in super grinding ball bearing race periphery.

2. the static pressure electric main shaft headstock clamping device of super grinding ball bearing race according to claim 1 grinding, it is characterized in that: described support (14) is provided with two, angle between two supports (14) is α, 90 °≤α≤120 °, and each support (14) is less than 180 ° with the angle of grinding points.

3. the static pressure electric main shaft headstock clamping device of super grinding ball bearing race according to claim 1 and 2 grinding, is characterized in that: between described stator (5) and headstock support (1), be provided with water shutoff cover (13).