If we just talk about the production process, from materials to heat treatment technology, from processing and manufacturing to assembly and packaging, the entire bearing production process is available in China, and the degree of automation is also quite high. But the key to manufacturing bearings is not to make them look alike, but to have good accuracy, load-bearing capacity and lifespan.
Engineers who have actually assembled bearings know that if you want the bearing to run well, the most important thing is to control the bearing clearance. Bearing clearance is the gap between the bearing rolling elements and the bearing inner and outer ring shell. The so-called bearing clearance refers to the amount of movement when the inner ring or outer ring of the bearing is fixed when it is not installed on the shaft or bearing box, and then the unfixed bearing clearance is moved radially or axially. . According to the direction of movement, it can be divided into radial clearance and axial clearance. The size of the clearance during operation (called working clearance) has an impact on the rolling fatigue life, temperature rise, noise, vibration and other properties of the bearing.
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Bearing clearance is usually adjusted during the assembly process, but in fact, the actual results of the clearance adjustment are already determined during the bearing manufacturing process. The basic structure of a bearing is a steel ball, inner ring, outer ring, and most also have a cage, dust cover, etc. Among them, the accuracy of the inner ring, outer ring and steel ball determines the accuracy of the clearance. If the dimensional accuracy of any of the three is insufficient, even if the clearance is not looked at, the accuracy of the bearing itself will not be too high, and the adjustment of the clearance will not be Good results will be achieved. Therefore, the manufacturing accuracy of bearing structural parts should be regarded as a key point in bearing manufacturing.
In addition, even if we can get the dimensions right and the bearings have good clearance after assembly and can operate with high precision after assembly and debugging, whether they can operate stably for a long time is another test. The long-term stability requirements depend to a large extent on the material itself. Whether the material is wear-resistant determines whether good dimensional accuracy can be maintained for a long time. Speaking of materials, there have been many technological breakthroughs in advanced bearing steel in China, but they are still in the promotion and application stage, and it will take time to improve the entire bearing level. Therefore, materials are still considered a key point in bearing manufacturing.
It can be said that after solving the problems of materials, heat treatment, machining process and assembly process, it is completely possible to produce good bearings.