tailieunhanh - Rolling Bearing Damage 2009 Part 11

Tham khảo tài liệu 'rolling bearing damage 2009 part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Other means of inspection at FAG Component tests Component tests There are numerous test rigs in FAG s development department for testing the efficiency of newly designed products. In some cases such tests can be used to clarify the cause of bearing damage. They include on the one hand direct tests on customer units for example deformation and vibration measuring on machines and on the other hand tightness inspections measuring of frictional moment and life tests on test rigs figs. 114 and 115. The tests are performed under clearly defined conditions where the expected results are reliably foreseeable. Once the bearings have met the requirements in the experiment the inspection of the damage case in question must then focus on the examination of actual operating conditions unexpected extra load also due to faulty mounting etc. . Should the bearings fail after an unexpectedly short running period the technical monitoring facilities of the test rigs allow damage to be detected in its stage of origin. This is often a problem in the field but it is also frequently decisive for finding the cause of damage. 114 Test rig for inspecting the efficiency of rolling bearing seals 69 I FAG Other means of inspection at FAG Component tests 115 Test rig for simulating operating stress of car wheel bearings FAG I 70 Other means of inspection at FAG Calculation of load conditions Calculation of load conditions 116 Calculation of stress on a journal roller bearing housing by means of the Finite Element Method FEM In several cases bearings whose load situation is not known completely are selected for new constructions on the basis of experience with older similar units. When bearing damage arises at a later stage an accurate calculation of the mounting conditions frequently helps in the search for its cause. A comparison of the expected life calculation and the life actually attained is particularly important as well as the calculation of lubricating conditions. FAG has an .