Rolling mill bearing installation method

The service life of rolling mill bearing, not only related to the quality of the bearing, and install and use the situation there is a close relationship. Therefore should pay attention to technical requirements of bearing installation, comply with the relevant procedures. Preparation of 1, before installation, 1) Before the installation, should the cooperation, including roll neck, bearing housing and bearing ring and bearing box cover plate with surface such as a review, check their size, shape, position precision and cooperate with the public fork meets the technical requirements of the design. ( 2) To match the bearing surface, roll neck, bearing box and oil hole edge and burrs must be removed, and clean with lubricating oil. 2, the installation of four row cylindrical roller bearings ( 1) Install the labyrinth ring ( Waterproof set) The labyrinth ring and roll neck with movable fit for tighter, installation time need copper bar into lightly. Labyrinth ring two red surface must be parallel with the shaft shoulder and bearing inner ring fit closely. ( 2) Install the inner ring of four row cylindrical zi child bearing inner ring and roll neck fits for interference fits, when installation should be heated to 90 - the inner circle 100 ℃ 。 Do not exceed 120 ℃, in order to prevent the inner ring retraction is not completely after cooling. Heating oil available heating can also be used in induction heating method, absolutely forbidden to use open flame heating. With oil tank heating inner diameter increased a lot in the following formula: delta d = 12. 5×10△t。 The d type: delta d - the inner ring diameter after heating of the ( mm） Delta t - the difference between the oil temperature and room temperature ( ℃) And the standard for the room temperature 20 ℃. D - the inner ring diameter ( mm） In the installation of FCD type double inner ring, inside is in the process of cooling must be along the axial inner ring and the inner ring, inner ring and labyrinth ring end face by post, with a feeler. ( 3) Install the outer ring of four row cylindrical roller bearing outer ring and bearing inner hole for transition fit, for smaller bearing outer ring and roller and cage can be overall knock gently with the rod into the bearing seat. Available for larger bearings, outer ring or keep the rack with a hole for hoist, hoist, outer ring and outer ring components straight down into the bearing housing. For with movable guard FCDP type four row cylindrical roller bearings, while retaining ring, outer ring components, retaining ring, in the same type of bearing is unfavorable exchange. On the outer end face Ⅰ, Ⅱ, Ⅲ, Ⅳ mark is a mark in load ( See figure 1) 。 When first installation use, to make the rolling load direction on the first Ⅰ mark mark, after washing the reload lets rolling load on the rest of the tags in turn, to prolong the service life of bearing. 3, thrust ( Positioning) The installation of the bearing thrust bearing four corners bearing, double row ( Single row) Corner corner bearing, two-way thrust taper and cylindrical roller bearing four corner bearings, double ( Single) Row angular contact ball bearing is used as the thrust bearing, are not allowed to be in the radial direction load, so the bearing inner hole corresponding to the bearing assembly parts, its diameter must be bigger than bearing outside diameter 0. About 5 mm. Or roller diameter smaller than the bearing inner diameter 0. About 5 mm. For the four-point contact ball bearing, installation do not separate the same type of swapping, in order to prevent the change axial clearance of the factory. Bidirectional thrust tapered roller or two-way thrust cylindrical roller bearing circle of septum, the same type of bearings do not swap, to prevent axial clearance change factory. Thrust bearing inner ring end face when installation must be compact, and the axial to lock. In order to avoid its relative rotation in the roll neck, roll neck with the wear and tear, burns. Brake pad roll shaft force bearing is through the two bearing box when using axial positioning, and adjust the axial clearance. When installing a bearing box, shall ensure that the bearing inner and outer ring of inside and outside the circle against and main bearing. When the frame fixed on both sides of the axial bearing box, attention should be paid to eliminate in the frame on both sides of the import of bearing box that produces in the process of bearing box axial channeling move in the direction of shaft end. ( 4) Four row circular cone roller bearings installed four row circular cone roller bearing inner ring with the matching of the roll neck is generally band gap, when installation, bearing load bearing box first, then put the bearing box into journal. Four row tapered roller bearing outer ring and bearing box hole also adopt the dynamic coordination, outer ring A load bearing box (first See figure 2) 。 Factory both inside and outside the outer ring, inner ring and baffle are printed character symbols, when installation, must according to the characters of the symbols in the order of load bearing box. Not any swap, to prevent the bearing clearance changes. After all parts are loaded bearing box, to space ring, inner ring and outer ring with outer baffle axial on tight. Measuring the outer end face and the gaps between the bearing box cover plate width, to determine the thickness of the sealing gasket accordingly.