One that must have attached great importance to the importance of improving the bearing clearance rate
　　NSK bearings radial clearance is one of the main quality index. Radial clearance refers to the inner and outer ring raceway and rolling the total clearance in the diameter direction.
　　Therefore, tapered roller bearing clearance of finished parts is not only accredited support eligibility of products bearing one of the main parameters, but also works NSK bearings are an important factor. The clearance values do not meet technical standards, will affect the reasonable distribution of load between the rolling elements, bearing accuracy of rotation, vibration, life expectancy can be affected, and therefore improve and guarantee the bearings the clearance rate, is undoubtedly very important.
II, analysis of radial pass rate of causation
　　In the formation of product quality, will immediately find cause of the problem is found. Use of causal analysis forms, our relatively low pass rate to radial clearance for analysis of situations.
　　Factors influencing the quality of NSK bearing clearance, there are five major. If temporarily does not consider material and environment factors, can main analysis detection instrument, and technology method and the personnel quality three who on tapered roll child bearing tour gap quality of effects, past bearing within, and outer ring and steel ball of supporting method is will within, outer ring ditch road of diameter deviation with instrument min selected good, and according to standard tour gap calculation out a a within ring ditch road diameter size value and a a outer ring ditch road diameter size value, then select corresponding size copper ball, three who Assembly Hou, with axis to tour gap check instrument test axis to tour gap upper and lower limit value, on does not meet technology requirements of, Three matching again. Bearing radial clearance values are values axial clearance for that, it is very difficult to guarantee the accuracy. Because the measured values axial clearance just upper and lower limit values, and upper and lower limits because Groove curvatures and their tactics vary in size, so using this method of matching NSK bearing whose radial pass rate is unstable. High low when, rework times more frequently, could not confirm the clearance of the products quality.
Three, the application of the necessary instrument to improve radial clearance rate
　　Ensuring the quality of NSK bearing parts of the processing of indication and assurance testing instrument under the premise of an accurate, use bearings inner and outer rings special supporting instrument on reasonable supporting the inner and outer rings of tapered roller bearings, are effective methods of improving bearing radial clearance rate:
　　1, the necessary instrument for supporting principle
　　In the process of assembling bearings, bearing clearance must comply with standard requirements, NSK bearings radial clearance deviation formula is:
　　U=X-Y-2Z or X-Y=U+2Z
　　U= radial ball bearings radial clearance without load, X= outer Groove diameter biases, Y= Groove diameter deviation, Z= steel ball diameter biases
　　U-values in the formula you can access from the national standards, the z-value is marked in the steel ball check out. Matching instrument supporting the task is in the bearing, the outer dimensions after the election, once measured with matching instrument (x-y) value, and then after matching the appropriate size ball Assembly, radial with radial clearance values clearance checking instrument.
　　2, matching method
　　First NSK bearings inner and outer Groove diameter fasteners used proof supporting instrument. Because supporting instrument is a two-point measurement of comparative law, so proofing device requires two parts namely, inner ring, outer ring raceway diameter fasteners. Supporting apparatus equipped with sangeqian tables, about two millenniums table reflects inner and outer Groove diameter biases, with an indicator once reflected (x-y) value.
　　For example: standard Groove in the outer ring road, the actual diameter biases +8 UM, standard parts for inner ring raceway diameter of the actual deviation of -5um, x-y=+8-( -5) =13um.
　　Calibration, measurement of Raceway diameter fasteners the same align inside and outside their respective points, matching instrument of yizhiqian table in the middle position of the pointer in +13 UM, prove that instrument has proofread better. Conversely, thousand table pointer is not in +13 UM location, you need to resize the instrument.
　　As supporting former inner and outer Groove diameter separation has been good, so supporting instrument for the left and right sides of the table you can save Millennium without, simply yizhiqian in the Middle table reflect (x-y) can choose the value of certain sizes of steel balls. Distribution of NSK bearing radial clearance values conform to high standards.
　　Necessary to remind that, in the inner and outer rings in the matching process, to insist on using standard proofing devices, preventing the stopwatch, or measured (X-Y value is not accurate, measured out bearing clearance values are in error. Apply effect, promote the use of auxiliary instrument, with a pass rate of up to 98-100%.


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