Spherical roller bearing is always off roller how to return a responsibility? The analysis reason

Recently had a customer ask small make up, spherical roller bearing is always off the roller is going on? Aiming at this problem, the bearing network ( Hereinafter referred to as:) According to the understanding of the bearings of knowledge, to summarize, the spherical roller bearing roller of what reason analysis, to share the following. First need to understand that common three kinds of structure of spherical roller bearing, there are two kinds of structures are shown in figure 1 below, inner ring 02 with small guard, distributed in two end face, and each has a roller gap, between 180 degrees, the effect of gap is convenient to load a suitable roller 04. Keep 46 or 66 of this kind of structure generally use brass material. After finish assembling finished products need to check the bearing slewing flexibility, but turn the outer ring after arrival 01, roller fall out from the cage, or hand less effort allocated in gaps, from bearing roller along the gap. Figure 1 self-aligning roller bearing roller drop reason analysis: spherical roller bearing assembly process roughly: maintains a 46 or 02, 66 sets of circle diameter, from the inner circle of small penal roller gap into the appropriate roller 04, form the inner ring components, but each column symmetry leave one or two cage pocket hole space, not to install roller. Internal components to be included in the outer ring 01, from the gap in the cage pocket hole space and again group roller. In check rotating flexible, there are some roller fall out from the cage, or in the gaps with the hand a little pressure, roller from the gap of emergence, therefore need from bearing related parts one by one to carry on the analysis, the analysis summarized as follows: 1, the influence of the bearing ring processing (1) small guard car bearing inner ring processing and the influence of bearing inner ring car according to the drawing requirements for processing small rim diameter '- 'Tolerance, usually - 0. 35 ~ - 0. 15 mm, designed only commonly basic size, the depth of the hole size tolerance. Actual processing according to the present machine tool accuracy tolerance control in the plus or minus 0. The range of 2 mm, and the gap size measurement is a small rim diameter deep mouth (for measuring The following figure 2) 。 The depth of the oil groove size tolerance according to the current processing industry standards in accordance with the plus or minus 0. 15 mm control, so that for depth ( Small guard outside diameter to the distance to the center of the oil groove) Shallow small guard, usually the depth size no more than 3 mm, could produce tolerance accumulation effects in practical processing ( Guard outside diameter, depth of the gap size for minimum size, oil groove depth for the largest size) Roller end face, resulting in contact with the rim of the smallest, sometimes contact area and close to the oil groove. As a result, less effort in gaps roller along the gap will be allocated. For deep guard, due to its contact with the rim area is larger, the relative tolerance effect is small, sometimes even can be ignored. Figure 2 hole depth measuring method (2) the influence of the bearing inner ring small guard grinding bearing inner ring grinding, grinding small guard cheng method sometimes find a few small grinding after black guard. Due to the cause of the car processing small guard small grinding machining allowance or grinding, plane grinding process of equivalent resulting in still have black after grinding. Often wear black leather can be normal to move, it caused a small small rim thickness. For the shallow depth of small guard, roller contrate itself and its contact area is small, small guard after grinding roller along the inner ring of the axial distance increases, thus make the roller along the gap out more easily, are shown in figure 3 below. Figure 3 small block over a grinding (3) the bearing ring raceway grinding effect of bearing outer ring raceway grinding mill processing, sometimes find a few still have black after grinding. Due to causes car processing and heat treatment of small grinding machining allowance or outer raceway deformation, resulting in still have black after grinding. Will usually outer raceway grinding, black can grind down normally, so need to inner raceway owe mill so as to realize the normal assembly procedure set. This caused outside the center diameter roller group as a whole, make the roller contact with the guard outside the area, small outside after the actual contact area than in the gaps, so that the roller out more easily along the gap. 2, the influence of the cage processing frame processing drilling in the drilling machine, often through the uniform mold positioning drilling. Due to the manufacturing without special machine tool processing, mold manufacturing precision is low, as is sometimes flat end face process maintains a base surface flatness are super bad, cause pocket machining depth dimensions is not unified, generally by adjusting the repositioning drilling machine tool, the result is deep hole, round hole diameter is larger, and after loading roller, roller and cage clearance is big, and along the cage axial momentum large, finally after full of roller, roller and cage overall clearance is bigger. In the test bearing rotary roller out of the cage falls off easily. Additional measurement maintain center diameter, by measuring the distance measuring column control, caliper strength, degree of skew pillar is different also, Pillars in the pocket hole position) , so the final measurements can only be used as a reference, cannot effectively reflect the reality of the center diameter measurements. For large bearing, because of its guard generally darker, this kind of measurement method. And for small bearings, because its rim shallow, influence is bigger, sometimes the actual center diameter is larger, and the measurement is unqualified, often appear such circumstance. Center after the big diameter, roller group overall center slants, cause the roller with small guard outside the contact area, small outside after the actual contact area than in the gaps, resulting in roller emerge from the gap.