1 Mechanical precision bearings to match the requirements of

As the precision bearings within their 1μm accuracy, thus requiring its matching parts (shaft, bearings, cover, ring, etc.) have a high dimensional accuracy and shape accuracy, especially with precision to control the surface and bearing the same levels, and this is crucial, but also the most easily overlooked.

Must also pay attention to match the mechanical precision bearings fail if the above requirements, often makes precision bearings after installation several times larger than the original bearing error, or even 10 times more errors, completely not become a precision bearing, because the match machine pieces of error is often not simply added to the bearing error, but on different multiple enlarged additions.

2. Precision bearings

After installation to ensure the bearing does not produce excessive deformation, must be:

(1) axis and the housing bore roundness and vertical shoulder block bearings in accordance with the appropriate degree of precision required.

(2) Is necessary to accurately calculate the rotating ringing with the amount of interference, but also to accurately calculate the amount of the fixed ring of a suitable match.

Rotating ring blanch the extent possible amount of interference should also get smaller. And ensure the work as long as the temperature of the thermal expansion effects and the highest speed of the centrifugal force effect, to avoid tight with the surface creep or slide. Work load according to the size of the fixed ring and bearing sizes, select a very small clearance fit or interference fit, too loose or too tight is not conducive to maintaining the original shape exactly.

(3) Bearing conditions such as high-speed operation, and high temperature, special attention should be co-rotating rings can not be too loose to prevent eccentric, and there can not be fixed with the ring of the gap, to prevent the rings in deformation under load and excitation vibration.

(4) the ring to take a small interference fit condition to match the surface shape of the two sides have very high accuracy and low roughness, or cause installation difficulties removal more difficult, also need to consider the impact of spindle thermal elongation .

(5) the use of pairs of double angular contact ball bearing spindle, most of the load lighter, such as its relatively large amount of interference with, its internal axial preload volume will be significantly too large, resulting in adverse effects. Use double row cylindrical roller bearings and tapered roller bearings spindle, the load is relatively large, so its interference with relatively larger.



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