To identify the quality of equipment bearings, we gener […]
To identify the quality of equipment bearings, we generally proceed from the following aspects:
1. Is the packaging clear?
Double row tapered roller bearings
Under normal circumstances, brands produced by regular manufacturers have their own dedicated designers to design external packaging and organize production in factories that pass production conditions, therefore the product packaging must be very clear, from lines to blocks of colors. Unequivocal
2. Is the steel impression clear?
Each bearing product is printed with its brand name, label, etc. in the bearing product body. Although the source is very small, the products produced by the usual manufacturers use steel stamping and embossing technology before heat treatment. Therefore, although the source is small, it is deeply concave and very clear. Under normal circumstances, the sources of counterfeit products are not only vague: due to the approximate printing technology, the fonts float on the surface. Some of them can be easily erased by hand or the marks are severe.
3. Is there noise?
Hold the inner sleeve of the bearing with your left hand and turn the jacket back and forth by turning it with a small amount in your right hand. Listen to any noise during bearing operation. Due to the late production conditions of most counterfeit products and the complete manual operation of the workshop, impurities such as dust and sand will inevitably mix in the bearing body during the production process, so that when the bearing turn, a noise or an uneven operation will occur. . This is the key to judge whether the product comes from a regular manufacturer's brand product with strict machine production and operation standards.
If there is cloudy oil on the surface This requires that we pay special attention when buying imported bearings. Because there is still a certain gap between national oxidation prevention technology and advanced foreign manufacturing countries, it is easy to leave thick oil marks when the bearing body is resistant to oxidation, and it feels sticky and thick when puts in contact with the hand. Almost no trace of antioxidant oil can be seen on imported bearings. According to industry experts, particularly attentive people can smell a special taste in imported bearings, which is the smell of antioxidant oil.
5, if the chamfer is uniform
The so-called chamfer of the bearing, that is, the intersection of horizontal and vertical surfaces, due to the limitation of production technology, counterfeit bearing products are not satisfactorily handled at these corners, which can be easily identified.
The bearing packing is divided into inner packing and outer packing
After the bearing is manufactured and qualified after inspection, it is cleaned and rust-proof, and then placed in the inner packaging to achieve the purpose of waterproof, moisture-proof, dust-proof, impact-proof , maintaining the quality and precision of the bearing, and convenient use and sales. .
The internal packing of the bearings is divided into three categories according to the oxidation prevention period:
Packaging Short rust-proof packaging: the rust-proof period is 3 to 6 months, which is suitable for bearings that are sent to the same subscriber in large quantities and put into use in a short time. Based on the agreement between the two parties, a simple package based on the principle of convenience is adopted.
Packaging General rust-proof packaging: the rust-proof period is one year, which is suitable for general purpose bearings.
Packaging Prolonged antioxidant period packaging: two year antioxidant period, suitable for special and precision bearings.
The inner packing materials of the bearing are polyethylene plastic tube (box), kraft paper, smooth and wrinkled polyethylene composite paper, paper box, polyethylene or polyethylene plastic film, nylon fastening tape or braided fastening tape Plastic, high strength waterproof plastic tape, burlap bags, etc. All of the above materials must ensure that the corrosion resistance test of the material is qualified.