Can the milling machine spindle be fitted with angular contact ball bearings?

Milling machine processing is mainly used in rough machining, single row tapered roller bearings can withstand the impact of rough machining, angular contact ball bearings belong to the finishing equipment used, impact resistance is not as good as single row tapered roller bearings, if you want to have a good finish of aluminum plates, you can only change a finishing equipment or replace a single row tapered roller bearings with imported bearings, imported bearing accuracy will be better than the domestic one. If the finished aluminum plate is very poor, you can also check whether the spindle of the milling machine is normal.

1. Tapered roller bearings: subject to radial load and axial load.

2. Angular contact ball bearings: subject to axial load.

If the spindle and its connecting parts and transmission parts are cheap, please choose 2

Otherwise, choose 1

Angular contact ball bearings can withstand both radial and axial loads. Able to operate at higher speeds. The larger the contact angle, the higher the axial load capacity. High-precision and high-speed bearings typically take a 15-degree contact angle. Under the action of axial force, the contact angle increases.

a) Classification. Common angular contact ball bearings are single row angular contact ball bearings and double row angular contact ball bearings.

Single-row angular contact ball bearings: can only withstand axial loads in one direction, and when subjected to radial loads, additional axial forces will be induced. and can only limit the axial displacement of the shaft or housing in one direction;

Double row angular contact ball bearings: If they are installed in pairs, the outer rings of a pair of bearings are opposite, that is, the wide end faces the wide end face, and the narrow end faces the narrow end face. This avoids additional axial forces and limits the shaft or housing to axial clearance in both directions.

Because the raceways of the inner and outer rings can be moved relative to each other on the horizontal axis, they can withstand both radial and axial loads – combined loads. Single-row angular contact ball bearings can only withstand axial loads in one direction and are therefore often installed in pairs.

2) Scope of application:

Single-row angular contact ball bearings: machine tool spindles, high-frequency motors, gas turbines, centrifugal separators, small automobile front wheels, differential pinion shafts, booster pumps, drilling platforms, food machinery, indexing heads, repair welding machines, low-noise cooling towers, mechanical and electrical equipment, coating equipment, machine tool groove plates, arc welding machines.

Double row angular contact ball bearings: oil pumps, roots blowers, air compressors, various transmissions, fuel injection pumps, printing machinery, planetary reducers, extraction equipment, cycloidal reducers, food packaging machinery, electric welding machines, electric soldering irons, square boxes, gravity spray guns, stripping machines, half shafts, inspection and analysis equipment, fine chemical machinery.

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Main Uses of Angular Contact Ball Bearings:

Single-row angular contact ball bearings: machine tool spindles, high-frequency motors, gas turbines, centrifugal separators, front wheels of small automobiles, differential pinion shafts.

Double row angular contact ball bearings: oil pumps, roots blowers, air compressors, various transmissions, fuel injection pumps, printing machinery.

Angular contact ball bearings.

There are three types of installation forms: back-to-back, face-to-face and tandem arrangement. The outer ring of an angular contact ball bearing, thick on one side and thin on the other. The thick side is called the "back", and the thin side is called the "surface".

Angular contact ball bearings are mostly installed in pairs and preloaded. If the installation is good, the working accuracy and bearing life of the host can be greatly improved; Otherwise, not only will the accuracy not meet the requirements, but the service life will also be affected.

1. When installed back-to-back (the wide end faces of the two bearings are opposite), the contact angle of the bearing spreads along the direction of the axis of rotation, which can increase its radial and axial directions.

The bearing angle is rigid, and the anti-deformation ability is the largest;

2. When face-to-face (the narrow end faces of the two bearings are opposite) are installed, the contact angle of the bearing converges towards the direction of the axis of rotation, and the rigidity of the bearing angle is small. Because the inner ring of the bearing extends out of the outer ring, when the outer ring of the two bearings is pressed together, the original clearance of the outer ring is eliminated, and the preload of the bearing can be increased;

3. When the series arrangement (the wide end face of the two bearings is in one direction) is installed, the contact angle of the bearing is in the same direction and parallel, so that the two bearings can share the working load in the same direction. However, in order to ensure the axial stability of the installation, two pairs of bearings arranged in series must be mounted opposite each other at both ends of the shaft. The above is precision bearing, Rockwell's hope to help everyone.

Summary. In general, there are three common combinations of angular contact bearings: angular contact bearings, face-to-face bearing mounting:

1.Adjust the face-to-face bearing arrangement with the shaft in a vertical position so that the bearing below can be used as support. The distance between the outer ring flanks and the housing flanks is measured to determine the required shoulder width of the end cap based on the required axial clearance or the required preload during operation.

If necessary, determine the necessary thickness of the gasket to be inserted between the housing and the end cap or between the outer ring and the end cap; 2.Install the resulting end caps (and spacers) and turn the bearing arrangement back to a horizontal position. For bearing arrangements with clearance, the remaining axial clearance is measured using a dial gauge to verify the adjustment results; 3.

When operating, the clearance usually decreases (preload increases) due to rising temperatures, temperature differences between the inner and outer rings, and several other factors such as speed and load.

In general, there are three common combinations of angular contact bearings: angular contact bearings face to face bearing mounting: 1

Adjust the face-to-face bearing arrangement with the shaft in a vertical position so that the bearing below can be used as support. The distance between the outer ring side and the housing side is measured, and the shoulder width required for the end cap is determined according to the required axial clearance or the required preload during operation. If necessary, determine the necessary thickness of the gasket to be inserted between the bearing seat and the end cover, or between the outer ring and the end cover; 2.

Install the resulting end caps (and spacers) and turn the local bearing arrangement back to a horizontal position. For bearing arrangements with clearance, the remaining axial clearance is measured using a dial gauge to verify the adjustment results; 3.When operating, the clearance usually decreases (preload increases) due to rising temperatures, temperature differences between the inner and outer rings, and several other factors such as speed and load.

Angular contact bearing back-to-back bearing mounting:1When adjusting the back-to-back bearing arrangement, screw the lock nut or bolt into the end plate and turn the shaft occasionally.

For bearing arrangements with clearance, use a dial indicator to measure the remaining axial clearance, and if the remaining clearance is too large, tighten the lock nut or end plate bolt. If the remaining clearance is too small, remove the bearing and start over; 2.For the preloaded bearing arrangement, it is not advisable to use a dial gauge to directly measure the volume of Zheng Pi.

Indirect grip methods should be used to adjust the preload, such as by fit, displacement measurement, or frictional moment control. If a spacer is used for the beam between the inner rings of two bearings, the width of the spacer can be ground accordingly to set the desired clearance or preload.

Angular contact bearing tandem bearing mounting: 1For double-row angular contact ball bearings and four-point contact ball bearings with a combined inner ring, a specific historical installation sequence should be followed.

First, push the inner ring of the medial limb half of the limb into the correct position; 2.Place the outer ring of the cage assembly with steel ball on the half of the inner ring that has been installed; 3.Push the outer half of the inner ring so that it is close to the inner half that has been installed. or swim.

There are three ways to install angular contact ball bearings:

1. Back-to-back installation, the wide end faces of the two bearings are opposite, and the contact angle of the bearing is expanded along the direction of the rotation axis, which can increase the rigidity of its radial and axial support angles, and the maximum anti-deformation ability;

2. Face-to-face installation, the narrow end faces of the two bearings are opposite, the contact angle of the bearing converges towards the direction of the rotation axis, and the rigidity of the bearing angle is small. Because the inner ring of the shaft mu extends out of the outer ring, when the outer ring of the two bearings is pressed together, the original clearance of the outer ring is eliminated, and the preload of the bearing can be increased;

3. The wide end faces of the two bearings are in one direction, and the contact angles of the bearings are in the same direction and parallel, so that the two bearings can share the working load in the same direction. However, when using this installation form, in order to ensure the axial stability of the installation, the two pairs of bearings arranged in series must be installed opposite each other at both ends of the shaft.

The service life of high-speed precision angular contact ball bearings has a lot to do with the installation, and the following matters should be noted1Bearing installation should be carried out in a dust-free, clean room, the bearing should be carefully selected, the bearing spacer ring should be grinded, and the parallelism of the spacer ring should be controlled below 1um under the premise of maintaining the same height of the inner and outer ring spacer rings;

2.The bearing should be cleaned before installation, the inner ring slope should be upwards when cleaning, the hand sense is flexible, there is no sense of stagnation, after drying, put in the specified amount of grease, if it is oil mist lubrication, a small amount of oil mist oil should be put in;

3.Special tools should be used for bearing installation, and the force should be uniform, and it is strictly forbidden to beat;

4.The bearing storage should be clean and ventilated, no corrosive gas, the relative humidity should not exceed 65%, and the long-term storage should be regularly rust-proof.

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