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Bearing material testing items Bearing material testing methods

Bearing is an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotary accuracy.

I believe that everyone should have seen bearings, now is the era of machinery, as an important part of contemporary machinery, the main function of the bearing is to support the mechanical rotating body, reduce the coefficient of friction, and ensure the accuracy of rotation. Now with the development of the times, a variety of bearings have been invented, but as a user, the style of the bearing is not important, after all, a bearing is good or bearing material, only the material passes, the use of bearings is really pass, the machine is also considered qualified.

Bearing detection range:

Sliding bearings, joint bearings, rolling bearings, deep groove ball bearings, angular contact bearings, self-aligning ball bearings and so on.

Bearing material testing scope:

Bearing material testing scope is generally between metal materials, non-metallic materials and porous metal materials.

First, metal materials: metal materials are more common materials in bearings, mainly including bearing alloys, copper alloys, aluminium-based alloys, zinc-based alloys and so on. Among them, the bearing alloy is also known as axial tile alloy, has good wear resistance and wear reduction performance; have a certain compressive strength and hardness, in the sliding bearing is more common. Bronze alloy's have good performance in strength, friction reduction, wear resistance, etc., of which bronze has better performance than brass and is a commonly used material. Aluminium-based alloy has better corrosion resistance and high fatigue strength, friction performance is also very good, so in some areas to replace the more expensive bearing alloy and bronze materials.

Second, non-metallic materials:

With the progress of production and science and technology, human beings to natural minerals, minerals, plants, oil and other raw materials, manufacturing and synthesis of many new non-metallic materials, such as artificial graphite, special ceramics, synthetic rubber, synthetic plastics, etc., which is more common in the field of bearings is a variety of plastics, such as phenolic resins, nylon, polytetrafluoroethylene and so on. Because the plastic material and many chemical substances are not reactive, corrosion resistance, and has a certain self-lubricating, in high temperature conditions with a certain lubricating ability; embeddedness; friction reduction and wear resistance are relatively good. Plastic bearings are often used in electromechanical equipment, fitness equipment, food machinery, furniture and decorative building materials, etc., with a long service life.

Third, porous metal materials:

Porous metal material refers to the use of different metal powders by pressing, sintered bearing materials. This material is porous structure, the pore accounts for about 10-35% of the volume. Before use, the shaft tile in hot oil impregnated for several hours, so that the pores are full of lubricating oil, and thus usually this material is made of bearings called oil bearing, with self-lubricating, can be in a long time without lubricating oil can still work well.

Bearing material testing project:

Bearing testing projects are: number plate identification, elemental analysis, metal and its compounds analysis, physical properties can be done thermal properties, oxidation resistance, wear resistance, salt spray, corrosion, density, coefficient of thermal expansion, modulus of elasticity, hardness, payload, etc., the process performance can be done to do the filament stretching, fracture inspection, repeated bending, two-way torsion, hydraulic pressure test, flaring, bending, curling, flattening, ring expansion, ring tensile Microstructure, metallographic analysis, failure analysis, non-destructive flaw detection.

Bearing part of the test standard: GB/T 18579-2019: high-carbon chrome bearing steel wire

GB/T 305-2019: pick rolling bearings radial bearing stop groove and stop ring dimensions, product geometric specifications (GPS) and tolerance values GB/T 12764-2019: pick

Rolling bearing without inner ring drawn outer ring needle roller bearing dimensions, product geometry technical specifications (GPS) and tolerance values GB/T 24610.1-2019: adopting rolling bearing vibration measurement method part 1: basic GB/T 24610.1-2019: adopting rolling bearing vibration measurement method part 1: adopting

GB/T 24610.2-2019: 采 rolling bearing vibration measurement methods Part 2: with cylindrical holes and cylindrical outer surface of the radial ball bearing GB/T

24610.3-2019: Vibration measurement methods for rolling bearings Part 3: Spherical roller bearings and tapered roller bearings with cylindrical bore and cylindrical outer surface