Imported SKF bearing improper selection effect on assembly after use

Improper selection of bearing a large part of the reason is in a large axial load using thrust bearing or not can bear larger diameter, the axial union load bearing structure, only use no cage cylindrical roller bearing is not advisable to act that way. SKF bearing lubrication bad is the immediate cause of bearing damage, from the current situation of the damaged bearing analysis. The bearings work in accumulation after 3000 hours, imported bearing rolling work surface no fatigue damage, bearing only a scratch, according to the radial load calculation of bearing fatigue life is very long. According to the nuance of bearing fracture of material organization no bulky grain phenomenon occurs, fracture in silver, belong to brittle fracture. Bearing inner race has no obvious wear and material bonded burn phenomenon, bearing inner ring on one side of the guard, to discover the obvious phenomenon of wear and tear, more the main reason is that side of the circle, guard the main crack, SKF bearing found visible cracking and blue area of the materials, imported bearings and inner ring guard side without exception. First, the restrictions on the size of the bearing. Usually bearing can install space is restricted. In most cases, the diameter of axle ( Or bearing inside diameter) Based on mechanical design or other design constraints. So bearing type and size of the choice is determined according to the inner diameter of the bearing. As a result, the main dimensions of the standard bearing table according to the international standard and diameter is compiled. Second, the classification of bearing. According to the classification of bearing, may use imported bearing industry are analyzed, and the key problem is to according to the actual situation of the company stock, focus on industry. 1 bearing installation: SKF bearing installation must be carried out in a dry, clean environment conditions. Before installation should carefully check the shaft and the shell surface, convex shoulder of end face and groove and the connection surface machining quality. Generally has a high speed, high precision equipment all need bearings, because want to insure the normal speed and high accuracy, and reduce maintenance costs. Usually, the shaft is two bearings in the radial and axial support, called the SKF bearing on one side of the fixed end bearing, it bear radial and axial load, the fixed axis and the relative axial displacement between the bearing box. To the other side is called the free end, only bear radial load, axial can move relatively. Fixed end bearing must be at the same time and the fixed shaft and bearing box, a suitable bearing is able to withstand radial composite load bearing, for example, deep groove ball bearing, spherical roller bearings, double row or diagonal contact ball bearing or tapered roller bearing. Bear the radial bearing combination of pure radial load, such as inside and outside the circle without a guard of cylindrical roller bearing and deep groove ball bearing, four-point contact ball bearing or two-way thrust bearing combination, also can be used as a fixed end bearing. At this point, the second bearing provide two-way axial positioning, but must keep bearing box when installing a radial interval. Free end bearing in shaft due to thermal expansion, the length changes, imported bearings is not going to happen. Axial displacement may occur within the bearing and also can produce bearing ring and bearing seat. 'Cross fixed' refers to such an import bearing configuration, in which each SKF bearing to the shaft one-way positioning, and in the opposite direction. This combination is mainly used for short axis. All can bear at least one direction axial load with radial bearing, including deep groove and angular contact ball bearings, tapered roller bearings and NJ type cylindrical roller bearing, using angular contact ball bearing or tapered roller bearing, in some cases, must be exerted load.