Views:62 Author:KINGSKY Publish Time: 2019-04-19 Origin:Site
Discrimination method of bearing quality
Bearing is an important basic component of all kinds of mechanical equipment. Its precision, performance, life and reliability play a decisive role in the precision, performance, life and reliability of the main machine. In mechanical products, bearings belong to high precision products, which need not only the comprehensive support of mathematics, physics and many other disciplines, but also materials science, heat treatment technology, precision machining and measurement technology. Numerical control technology, effective numerical method and powerful computer technology serve for it, so bearing is a product representing the national scientific and technological strength.
According to the general method, bearings can be roughly divided into: needle roller bearings, concentric ball bearings, deep groove ball bearings, aligning roller bearings, thrust roller bearings, linear bearings, seat bearings, plain bearings, combined bearings, rolling mill bearings, Angular contact ball bearings, etc. There are many categories of products, and there are many manufacturers of these products, so how can we distinguish the weight of bearings for these products? There are usually the following methods to identify the quality of an equipment bearing:
1. Is the outer packing clear
Under the general circumstances of double row tapered roller bearings, the brands produced by regular manufacturers have their own special designers for external packaging design, and arrange for the production of factories that have passed the production conditions for production, so, The packaging of the product should be very clear and unequivocal from the line to the color block.
2. Whether the steel printing word is clear
Each bearing product will be printed on the bearing product body of its brand words, labels and so on. Although the font is very small, but the products produced by the regular manufacturers are using steel printing technology printing, and in the non-overheating treatment before the press, so its font although small, but concave deep, very clear. In general, the font of counterfeit products is not only vague, due to the rough printing technology, fonts floating on the surface, some can even easily be erased by hand or manual traces serious.
3.Each bearing product will be printed on the bearing product body of its brand words, labels and so on. Although the font is very small, but the products produced by the regular manufacturers are using steel printing technology printing, and in the non-overheating treatment before the press, so its font although small, but concave deep, very clear. In general, the font of counterfeit products is not only vague, due to the rough printing technology, fonts floating on the surface, some can even easily be erased by hand or manual traces serious.
3.Is there a noise?
The left hand grasps the bearing body sleeve, the right hand small range reciprocates moves the coat to make it rotates, listens to the bearing to operate the process whether there is the murmur. Due to the backward production conditions of most counterfeit products and the complete manual workshop operation, the bearing body will inevitably be mixed with impurities such as dust and sand in the production process. Therefore, when the bearing rotates, there will be noise or the running of the phenomenon is not smooth. This is the key to judging whether products come from strict production standards and machine-operated branded products from regular manufacturers.
4.If there is any muddy oil on the surface, we should pay special attention when buying imported bearings. Because there is still a certain gap between domestic rust prevention technology and foreign advanced manufacturing countries, it is easy to leave thick oil traces when the bearing body is rust-proof, and it feels sticky when touching with the hand. And foreign original imports of bearings almost no trace of rust-proof oil. According to industry sources, especially careful people can smell a special taste in imported bearings, this is the smell of rust-proof oil.
5.Whether the chamfer is uniform or not
The so-called chamfer of bearings, that is, the intersection of horizontal and vertical faces, counterfeit bearing products due to production technology constraints, in these corners of the edge of the processing is not satisfactory, which we can easily distinguish.
6. Bearing packing
When the inner and outer packing bearings are manufactured and tested, they shall be cleaned and rust-proof, and then put into the inner packaging to achieve water-proof, moisture-proof, dust-proof and impact-proof. Maintain the quality and accuracy of bearings and the purpose of ease of use and sale.
The inner packing of bearing is divided into three categories by rust-proof period:
①Short-term anti-rust packaging: rust-proof period of 3 months, suitable for mass delivery to the same subscriber, put into use in a short period of time. According to the agreement of both parties, simple packaging is adopted in accordance with the principle of ease of use.
②General anti-rust packaging: anti-rust period of one year, suitable for general purpose bearings.
③Long anti-rust period packaging: the rust-proof period is two years, which is applicable to special and precision bearings.
The inner packing materials of bearing are polyethylene plastic barrel (box), Kraft paper, plain and wrinkled polyethylene composite paper, paper box, polyethylene or polyethylene plastic film, nylon fastening tape or plastic fastening belt, waterproof and high strength plastic belt, linen bag, etc. All the above materials need to ensure that the corrosion resistance test of the materials is qualified.
Finally, secretly tell you some bearing rust-proof secrets.
If the bearing is wet by water, wash it with gasoline or kerosene, dry it, and then apply a layer of low viscosity oil or special antirust oil to the bearing. Anti-rust oil on the surface of the bearing will form a layer of oil film, oil film to prevent air contact with the bearing, also play a moisture-proof role. After evenly coated with rust-proof oil, the bearing should be wrapped with a thicker plastic film. The package must be closely attached to the bearing and must be wrapped tightly and cannot be breathable. A thick layer of Kraft paper should also be wrapped outside the plastic film to prevent moisture and damage of the plastic film after collision. If there is no Kraft paper can be replaced with other paper materials. Bearing in contact with acid or alkalinity After quality, the above maintenance steps should be carried out in time.
When the bearings need long-distance transportation, the above requirements should be packed first, and then packed into cartons. It is necessary to ensure that the bearing outer packaging is strong and sealed. It is best to add a layer of sealed packing material, such as snake skin bags, in the packing box. That is to say, it can prevent the carton damage and wet bearing after dripping. Did you learn? I'll see you next time.