Installation of high-speed machine tool spindle bearings should be based on the nature of the bearing structure, size and bearing components with the pressure should be applied directly to the tight fit ferrule end face shall not pass through the rolling pressure, the bearing installation generally use the following method:
a press-fit
The inner ring and the shaft of the tight fit of the high-speed machine tool spindle bearings, the outer ring and bearing holes than a loose fit, available presses the bearing pressure mounted on the shaft, and the shaft together with the bearing with load bearing hole pressure installed when the end face of the bearing inner ring pad assembly sleeve (copper or soft steel) do a soft metal materials, assembly casing diameter should be slightly larger than the journal diameter, outside diameter diameter than the bearing inner ring ribs slightly small, in order to avoid pressure on the retainer. The bearing outer ring and bearing hole is a tight fit, the inner ring and the shaft for the bearing to be pressed into the bearing hole than loose fitting, then assembled the outside diameter of the casing should be slightly smaller than the diameter of the housing bore. Ring and the outer ring of the bearing rings and the shaft and the housing bore is a tight fit when installed indoor pressed into the shaft and the housing bore, to The assembly casing structure should be able to charge tight end face of the bearing inner ring and the outer ring.
b heating with
By heating bearings ntn bearing, thermal expansion will be a tight fit to change the installation method is loose fitting. Is a common and effortless installation method. This method is suitable for the installation of the large amount of interference of high-speed machine tool spindle bearings, bearings or separable bearing rings into the fuel tank before hot charging uniform heating 80-100 ° C, and then remove from the oil as soon as possible onto the shaft on, after cooling in order to prevent the inner ring end face and shaft shoulder fit is not tight, after bearing cooling axial fastening. Bearing outer ring and light metal bearing is a tight fit, heating chock hot charging method, can be avoided with the surface by abrasion. Tank heating bearings from the bottom at a certain distance should be a net gate, or hanging with hooks bearing, high-speed machine tool spindle bearings can not be put on the bottom of to prevent Shen impurities into the bearings or uneven heating, the fuel tank must be thermometer, strictly control the oil temperature must not exceed 100 ° C, to prevent tempering effect, reduce the hardness of the ferrule.
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