Rolling mill industry
Full complement thrust tapered roller bearings
The full complement thrust tapered roller bearing for Press down mechanism connects the press screw and the upper roll support seat. The bearing is selected according to the rolling load and the screw diameter. In order to obtain the maximum load carrying capacity, this bearing adopts full roller complement. Full complement thrust tapered roller bearings for press-down mechanisms are generally divided into two types: the TTSX type has a convex surface profile on the shaft ring, while the TTSV type has a concave surface profile on the shaft ring. There are threaded holes on the shaft ring and seat ring of the bearing for lifting the bearing.
Four point contact ball bearings
The four-point contact ball bearing is a separable bearing, of which the QJO000 type has a double half inner ring, the QJF0000 type has a double half outer ring, and the contact angle is 35°. When there is no load or pure radial load, the steel ball and the ring are in four-point contact. Under pure axial load, the steel ball and the ring are in two-point contact and can withstand bidirectional axial load. This type of bearing can also withstand moment loads and has the functions of both single-row and double-row angular contact ball bearings. It can only work properly when two points of contact are formed.
Angular contact ball bearings
Angular contact ball bearings have a high limit speed and can bear radial loads and axial loads at the same time, as well as pure axial loads. Their axial load capacity is determined by the contact angle and increases with the increase of the contact angle. Angular contact ball bearings installed in pairs are composed of two sets of single-row angular contact ball bearings of the same specifications in different assembly methods. According to the combination of different end faces of the outer ring, they can be divided into three types: face-to-face, back-to-back and multiple arrangement. Angular contact ball bearings are generally used on support rollers with higher rotation speeds to carry axial loads.
Double Row Tapered Roller Bearings (TDO Type)
This type of bearing consists of a double raceway outer ring, two single raceway inner rings and an inner spacer. The bearing clearance is adjusted by changing the thickness of the inner ring spacer. There is an oil groove and several oil holes on the double raceway outer ring. This type of bearing can bear axial and radial combined loads at the same time, so it can be used as a fixed end bearing. It is also often used as a free end bearing to balance the relative movement between the bearing seat and the bearing outer ring caused by thermal deformation of the shaft.
Double Row Tapered Roller Bearings (TDI Type)
This is a double-row tapered roller bearing with double row front mounting and large contact angle. This type of bearing generally consists of a double-raceway inner ring, two single-raceway outer rings and an outer spacer. This type of bearing is generally used in situations where there is only axial load or the axial load is greater than the radial load. In some cases, a spring is used to provide preload between the bearing seat and the back of the bearing outer ring.
Four-row tapered roller bearings
The design principle of the four-row tapered roller bearing is to improve the carrying capacity of the rolling mill bearing as much as possible by optimizing the structure in a limited assembly space. Four-row tapered roller bearings are generally mounted on the roll neck with clearance fit for easy installation and disassembly. Due to the possible slippage between the inner ring hole and the roll neck, proper lubrication should be maintained on the contact surface to avoid wear. In order to prevent the inner ring end face and the inner spacer end face from sliding and rubbing each other, lubricating oil grooves are formed on both end faces of the inner ring and the inner spacer. There is an oil groove and several oil holes on the middle and outer rings
Four-row cylindrical roller bearings
Four-row cylindrical roller bearings are mainly used for heavy machinery, such as for supporting rollers used in rolling mills such as roughing mills, profile mills, and sheet mills. Four-row cylindrical roller bearings are classified into FC type, FCD type and FCDP type according to whether there is a rib on the outer ring and whether the inner ring is one or two. Still some inner holes are structural forms of tapered holes. All types of four-row cylindrical roller bearings can only withstand radial loads, so they must be used with thrust bearings, such as angular contact ball bearings, tapered roller bearings, etc.
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