How to choose the correct bearing and how to distinguish the quality of the bearing

How to buy bearings

1.Selection of bearing model

The bearing type is generally selected by the user's technical staff according to the use conditions and supporting load of the supporting product. The business personnel mainly understand whether the actual load of the user is consistent with the selected bearing. If the bearing fails to meet the requirements of use, the customer should be advised to change the model as soon as possible, but unless there is a special product, there is usually no problem in selecting the model.

2, the choice of bearing clearance

When purchasing a bearing, the user generally only tells what model and grade it is, and rarely asks for the bearing clearance. The business personnel must ask the bearing's use conditions, among which the bearing speed, temperature, and tolerances are directly related to the bearing Choice of clearance.

3. Selection of grease

The selection of grease is generally based on the bearing's speed, temperature resistance, noise requirements and starting torque, etc., and requires business personnel to understand the performance of various greases.

4.Selection of bearing seal type

Bearing lubrication can be divided into oil lubrication and grease lubrication. Oil-lubricated bearings are generally selected form bearings, grease-lubricated bearings are generally sealed with dust caps or rubber seals. The dust cover is suitable for high temperature or good use environment, and the seal is in contact.

Method to distinguish the quality of the bearing

Here are some common methods for identifying the quality of bearings:

1.Is there any turbid oil on the surface?

As the current domestic rust prevention technology is not special yet, it is easy to leave thick oil marks on the bearing body when it is rust-proofed, and it is very sticky when it is held in the hand, but it is almost invisible on imported bearings The traces of rust-proof oil, but the very careful experts said that the imported bearings smelled a smell, it must be the rust-proof oil, just can't see it. This should be paid special attention when purchasing imported bearings.

2.Is the steel printing clear?

The bearing body will be printed with brand words, labels and so on. The font is very small, but most of the products produced by the factory use stamping technology, and it is embossed before heat treatment. Therefore, although the font is small, it is deep and very clear. The fonts of counterfeit products are relatively vague. Because of the rough printing technology, the fonts float on the surface, and some can even be easily erased by hand.

3. Is the outer packaging clear?

Under normal circumstances, the brand of the factory has its own dedicated designer to design the external packaging, and arrange the production conditions of the factory for production, so the packaging from line to color block is very clear and unambiguous. (Some imported bearing brand accessories also have unique designs designed to protect their intellectual property rights).

4, whether there is noise

Hold the bearing inner sleeve with your left hand, and turn the jacket with your right hand to make it rotate, and listen for noise. Due to the backward production conditions of most counterfeit products and completely manual workshop operation, impurities such as sand will inevitably be mixed in the production process and hidden in the bearing body, so there will be noise when rotating. This is different from the genuine brand that strictly implements production standards and operates with machines.

5.Is the chamfer even?

The so-called chamfer of the bearing, that is, the intersection of the horizontal and vertical surfaces, due to the limitation of production technology, counterfeit bearings are not handled satisfactorily in these corners.