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Industrial powder grinding with grinding machine adopts rolling bearing, has been widely promoted in our country, the save power consumption, increase production, save oil, decrease maintenance, less pollution, and many other aspects, has received the good effect.At present, some manufacturers follow the example of grinding machine adopt the method of rolling bearing, in the hollow shaft and the installation of the rolling bearing form more unreasonable place, to the mill to use in the operation of the factory in the future work has brought some disadvantages.In order to solve this problem, we put forward the mill hollow shaft installation best assembly method of rolling bearing.Mill hollow shaft installed the old-fashioned method of rolling bearing is the inner diameter of the hollow shaft processing into suitable for bearing, bearing thermal device, bearing parts, bearing outer ring of top cover, top cover by front-rear spiral tube (or front-rear bushing) bolted on the hollow shaft, with pressure.In the process of grinding operation, front-rear screw barrel, fixed bolt looseness, often caused the roof and the hollow shaft of the displacement, the dust will be empty axis and the gaps between the top cover into the bearing box, make dirty grease, lead to bad lubrication, bearing damage is often happened.In order to overcome the above several shortcomings, after several years of practice and exploration, we designed a new kind of installation method, and got good application in some factories.The method is: in the mill hollow shaft will install the part of the rolling bearing diameter bold, hollow shaft is the cooling of the thin oil and conduct hollow shaft to the bearing temperature drop to 60 degrees below the normal range.