The bearing inner ring and outer ring are made of alloy steel coil and are processed and assembled through special process. Spiral slits on the surface of the inner ring and outer ring enable lubricating oil to continuously and evenly spread on the surface of the bearing. Under the working condition with large temperature differences, the bearing fit size can be compensated automatically.
P&N is mainly engaged in the design and production of bearings used for plate guide rollers and the design of bearings required by every part of arc casting machinery. P&N can provide the design of all these different bearings.
Advantages of spiral bearings
A) Bearings of this kind are made of spring steels. The annealing temperature of spring steel is 3500C. Therefore, its temperature sensitivity is poorer than that of ball-bearing steel (100C6) with an annealing temperature of 1800C. When the material temperature reaches above the annealing temperature, it will lose the hardness. In this sense, spring steels are more applicable to high-temperature service.
B) Spring steels have good flexibility, so they are easy to be installed. The inner ring can be installed in any position with the help of two hook spanners. The internal tension of the inner ring can make it fastened on the shaft. It’s quite easy to realize the processing of the inner ring with a machining tolerance of h9 or h1l by using elastic materials. In so doing, the high costs for processing the inner ring could be saved.
C) Bearings of this kind are durable in use and slightly affected by dirt, slag scrap irons water and the weak acid formed by dropped iron powders and water. Thin wall spiral coil leaves a larger space for rolling parts with large diameters. These parts can roll to press dirt and exotics into the spiral slits of spiral coils, which can maintain the cleanness of the bearing surface at the time of rotation.
D) The principal advantage of spiral bearings is that the outer ring can be reused for many times, making it possible to reprocess the bearings once they are damaged or bended as affected by temperature changes. Under this circumstance, the bearing pedestal also needs to be adjusted. The characteristic of this structural design is that only the outer spiral ring but not the entire set of bearings needs to be changed, and all other bearing parts can be reused. The bearing pedestal is adjusted by means of adding the diameter size by 1mm at one time. For instance, when the inner diameter is increased from 105mm to 106mm, the diameter of the spiral outer ring also needs to be increased by 1mm for installation. This adjustment can be repeated until the diameter reaches 110mm. therefore, the outer ring can be reused for 5 times, which can substantially reduce the expenses, especially when all other bearing parts can be reused for 6 times.
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