Bearing box installation method and precautions:

Bearing box installation method and precautions:

First, the installation of the bearing box:

1. Standard type: Several methods of installing bearing housings with snap rings and fixing plates. Mounting the bearing with the set screw will cause the bearing casing to deform and should be avoided as much as possible.

2. Flange type: When installing flange type linear bearing, the surface precision of the bearing housing with the matching must be accurate.

3. Adjustable type (small opening type): The bearing is perpendicular to the opening on the bearing housing, so that a uniform preload in the circumferential direction can be obtained.

4, large opening type: If used with a suitable bearing housing, large opening bearings can also be adjusted for clearance, and even light preload.

Second, the installation matters:

1. When the linear bearing is installed in the bearing housing, auxiliary work should be used to avoid direct tapping of the end face or the sealing ring. The bearing should be evenly introduced, and the buffer plate should be used to load it with a gentle tap.

2. When the optical axis is inserted into the linear bearing, the center line of the shaft and the bearing must be in line. If the shaft is inserted obliquely, the balls may fall off or cause the cage to be deformed and damage the linear bearings.

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Introduction to the cause of failure of sliding bearings

Imported bearings will always encounter some technical problems in the use and purchase. Today, the technicians of Tianjin Jiarui Yiye Bearing Co., Ltd. will explain the reasons for the failure of sliding bearings.

1. Material and blank manufacturing factors

(1) poor adhesion between the liner and the backing

This is a major problem with sliding bearings that cast tin-based or lead-based bearing alloy liners. A good combination enhances the tin-based and lead-based bearing alloys and contributes to heat dissipation from the bearing surface. For good bonding, tin must be placed on the backing joint before casting the tin-based and lead-based bearing alloys, and the temperature of the backing and bearing alloys is strictly controlled.

When the size of the bearing bush is allowed, the tin bath method should be used to hang the tin. The temperature of the tin bath in the pure tin bath should be kept at 280-300 ° C. The temperature of the tin bath in the solder bath should be kept at 270-300 ° C. The bush is immersed in the tin bath. The temperature can reach the tin liquid temperature and can be taken out. Large bushings can be tinned by tinning, first heating the bush with flame, and then applying pure tin or solder to the surface to be tinned.

It has been found that making a wedge groove on the surface of the backing cast lining not only does not contribute to the combination of the backing and the lining, but at the sharp corners of the shoulder of the groove, stress concentration will cause cracks.

(2) stomata

For large bushings with tin-based or lead-based bearing alloy linings, when the casting temperature is too low or the backing is insufficiently preheated, air bubbles will appear on the lining joint surface. These bubbles are not conducive to heat dissipation from the surface of the bearing pad and also weaken the tin- or lead-based bearing alloy lining. When casting a cast copper-based alloy, looseness is caused by the release of hydrogen from the copper alloy.

(3) Large grain size

This is a peculiar problem for tin-based and lead-based bearing alloy liner bushings. In the cooling and solidification process of the cast bearing alloy, if the cooling rate is very slow, the size of the tin-bismuth crystal grains will exceed 0.1 mm, which can be observed by the naked eye. Such intermetallic compounds are easily broken, break off the friction surface after being broken, and become particles entering the lubricating oil circulation system, causing bearing damage.

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