New anti-rust technology in precision imported bearing process

Core Tip: Corrosion occurs, which not only affects accuracy and surface roughness, but also reduces service life and is even scrapped and cannot be used. Bearing rust prevention work is an important job, especially
Corrosion, which not only affects accuracy and surface roughness, but also reduces service life, even scrapped and cannot
use.
Bearing anti-rust work is an important task, especially the rust prevention between processes, like the bearing in the heat treatment workshop after pickling, cleaning, grinding, there are many processes. When the product is not produced by running water, sequentially
After processing, it is stored in the intermediate warehouse, so the bearing rings stored between the processes must be rust-proof.
The conventional anti-rust oil anti-rust method similar to rust-proof paint and the methods for preventing rust between the bearing processes are generally the following:
1. Dip in the rustproof tank
The bearing ring is immersed in an aqueous solution of 5% sodium nitrite and 0.6% sodium carbonate. The anti-rust effect is good, but many rust-proof tanks and other equipment occupy a large amount of space, and management is not convenient.
2. Dip coating of concentrated sodium nitrite solution
After washing the product, it is immersed in a solution containing 15%-20% sodium nitrite and 0.6% sodium carbonate, and then stacked. In this way, the rust-preventing period is short, generally only 7-14 days, and in the rainy season, due to the wet weather, it can only be re-treated after 2-3 days, which requires labor and money.
3. Oiling
Apply anti-rust oil like anti-rust paint like finished product. This method must be cleaned before the next step is performed, which is troublesome.
Introduction of new anti-rust technology
After working with relevant manufacturers, many years of production practice has shown that the rust prevention between processes has been improved several times, so that the rust-proof effect is better. Initially, the rust prevention of the roller was tested. The semi-finished product and the finished product were washed once a day with an aqueous solution of sodium nitrite. After 3 months, no rust was found in the test results. Now, the semi-finished product of the bearing ring is spray-proof and rust-proof, and the effect is also the same. The spray-type anti-rust process is relatively simple, and the method is as follows:
1. Purchase and construction of equipment
According to how much semi-finished products are stored, an intermediate warehouse is built. The ground floor is made of cement floor, and a walkway can be set in the middle, about 1.5m, which is used to pass the bearing ring. Place a pool of sodium nitrite solution at the end of the channel. The solution is formulated with 5%-10% sodium nitrite plus 0.6% sodium carbonate, and the backwater groove is made on the ground, and then the bearing rings are stacked on both sides of the floor. Above, there is a 0.6m walkway between each pile of bearing rings. It can be said that the intermediate library is designed to be about 64m2, and its sodium nitrite aqueous solution pool is 1m3.

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Bearing troubleshooting method

Core Tip: It is not uncommon for a bearing to malfunction during operation, so there is no need to make a fuss. A failure has occurred and it is critical to judge and deal with it. Today we will explain the common FAG bearings.

It is not uncommon for the bearing to malfunction during operation, so there is no need to make a fuss. A failure has occurred and it is critical to judge and deal with it. Today we will explain the common faults of FAG bearings and how to eliminate them.

1. Bearing temperature is too high

When the mechanism is running, the part where the bearing is installed is allowed to have a certain temperature. When the body of the mechanism is touched by hand, it should be normal to not feel hot, otherwise the bearing temperature is too high.

The reasons for the bearing temperature being too high are: the quality of the lubricating oil does not meet the requirements or deteriorates, the viscosity of the lubricating oil is too high; the assembly of the mechanism is too tight (the gap is insufficient); the bearing assembly is too tight; the bearing race rotates on the shaft or inside the casing; Large; bearing cage or rolling body fragmentation.

2. Bearing noise

Rolling bearings allow a slight running noise during operation. If the sound is too loud or there is abnormal noise or impact, the bearing is faulty.

The causes of noise generated by rolling bearings are more complicated. One is the wear of the inner and outer rings of the bearing. As a result of this wear, the bearing and the housing, the bearing and the shaft are broken, causing the axis to deviate from the correct position and produce an abnormal sound when the shaft is moving at a high speed. When the bearing is fatigued, the surface metal peeling off will also increase the radial clearance of the bearing to produce abnormal noise. In addition, insufficient bearing lubrication, dry friction, and bearing crushing can produce abnormal sounds. After the bearing wears loose, the cage is loose and damaged, and the abnormal bearing damage will also occur.

When the rolling bearing is disassembled and inspected, the bearing failure and the cause of damage can be judged according to the damage of the bearing.

Rolling surface metal peeling

The bearing rolling elements and the inner and outer ring raceways are subjected to periodic pulsating loads, resulting in periodic changes.

Contact stress. When the number of stress cycles reaches a certain value, fatigue peeling occurs on the rolling element or the inner and outer ring raceways. If the bearing load is too large, this fatigue will be exacerbated. In addition, the bearing is not installed correctly, the shaft is bent, and the raceway is peeled off. Fatigue spalling of the bearing races reduces the accuracy of the shaft and causes vibration and noise in the mechanism.

2. Bearing burns

Burned bearings have a tempering color on the raceways and rolling elements. The causes of burns are generally insufficient lubrication, the quality of the lubricant does not meet the requirements or deterioration, and the bearing assembly is too tight.

3. Plastic deformation

Uneven pits appear on the contact surface between the raceway and the roller of the bearing, indicating that the bearing is plastically deformed. The reason is that under the action of large static load or impact load, the local stress of the working surface exceeds the yield limit of the material.

This type of situation generally occurs on bearings that rotate at low speeds.

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