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LDGM bearing parameters

LDGM bearing parameters

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Installation accuracy verification method

The traditional application of precision bearings is machine tool spindles, which have different requirements according to different processes. Generally speaking, the lathe spindle is used to cut metal at a lower speed and a larger cutting load. This type of spindle usually transmits drive torque through a pulley or a gear. This means that the load on the drive end of the spindle is also quite large.

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Matching method of precision bearing

After the bearing is installed in the main engine, if the radial runout of the main shaft is measured, it can be found that the measured value of each rotation has a certain change; During continuous measurement, it can be found that after a certain number of revolutions, this change will approximately repeat. The number to measure the degree of this change is the circle rotation accuracy. The number of revolutions required for the change to approximately repeat represents the "quasi period" of the circle rotation accuracy. A large magnitude change within the quasi period means a poor circle rotation accuracy.

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Matching of precision bearings

The interference of rotating ferrule should also be small within the possible range. As long as the influence of thermal expansion at the working temperature and the influence of centrifugal force at the highest speed are ensured, the creep or sliding of the tight fitting surface will not be caused. According to the working load and bearing size, the fixed ferrule selects a very small clearance fit or interference fit. Too loose or too tight is not conducive to maintaining the original accurate shape.

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Requirements for precision bearings

Since the precision of the precision bearing itself is within 1 μ This requirement requires that the matching parts (shaft, bearing seat, end cover, retaining ring, etc.) have high dimensional accuracy and shape accuracy, especially the accuracy of the mating surface should be controlled within the same level as the bearing, which is very important and easy to be ignored. 报错 笔记

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Distinction of precision bearings

The dimensional requirements are different. The dimensional deviation (inner diameter, outer diameter, ellipse, etc.) of the products with high accuracy grade is smaller than that of the products with low accuracy grade

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