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A, you must attach great importance to improve the bearing clearance pass rate the importance of
INA bearings supporting the main quality indicators when one radial clearance. Radial clearance refers to the inner and outer diameter of the channel in the direction of rolling elements and the total clearance.
Therefore, the bearing clearance is not only accredited finished parts after matching the eligibility of a product bearing the main parameters, but also can work INA Bearing is an important factor. Clearance value does not meet the technical standards will affect the load on the rational distribution between rolling elements, bearing rotation accuracy, vibration, life, etc. will be affected, thus to enhance and ensure the bearing clearance pass rate, is undoubtedly very important.
B, analysis of the causal relationship between the radial passing rate
Product quality in the formation process, once problems are detected should immediately look for the causes. Use of causal analysis form, we come for the partial radial clearance for a low pass rate case analysis.
INA bearing clearance affect quality of five factors. If not consider the material and environmental factors that can mainly analytical instrumentation, process methods and the quality of personnel of the three pairs of bearing clearance quality of past bearing inner and outer rings and the ball is supporting the inner and outer channel The diameter deviation instruments-sorted, and calculated according to a standard clearance channel inner diameter dimension value and the value of an outer diameter dimension of the channel, and then select the appropriate size ball, three assembled with shaft clearance tester to test the axial clearance of the upper and lower limits that do not meet the technical requirements of the three re-matching. As the bearing radial clearance value is the value of the axial clearance for that, it is difficult to ensure accuracy. Because the measured axial clearance limit value is only up and down, up and down the channel limits because of the size and curvature of each approach differ, so use this method matching the radial bearing out the passing rate is unstable. High and sometimes low, rework times more frequently, can not really get the quality product clearance.
C, application supporting device, the passing rate increased radial clearance
INA bearing parts in ensuring the quality of processing and test equipment to ensure accurate indication of the premise, the use of the bearing inner and outer rings special supporting instrument for the bearing inner and outer supporting reasonable, is to improve the bearing radial clearance pass rate effective Method:
1, supporting the principle supporting device
In the process of assembling the bearing, the bearing clearance must comply with the requirements of the standard, radial ball bearing radial clearance deviation formula is:
U = X-Y-2Z or X-Y = U +2 Z
Where U = radial ball bearing no load radial clearance, X = outer groove diameter deviation, Y = inner groove diameter deviation, Z = ball diameter deviation,
The U-value formula can access from the national standard, Z values have been marked in the ball check. With the task of supporting the instrument supporting the INA bearing inner and outer dimensions of the post-election, with matching disposable instrument measured (xy) value, and then matching the appropriate size ball for assembly, then the value of the radial clearance radial clearance instrument to be checked.
2, and the supporting methods
First bearing inner and outer groove diameter size standard proofreading supporting device. Because supporting instrument is measured using two comparative law, so proofreading instrument requires two standard parts that inner, outer groove diameter of standard parts. Supporting instrument equipped with three micrometer, about two micrometer respectively, reflecting the inner and outer groove diameter deviation, the middle one-time indicator reflects the (xy) values.
For example: The actual outer diameter of the channel standard deviation of +8 um, inner diameter standard deviation of the actual channel-5um, then xy = +8- (-5) = 13um.
Calibration, the outside diameter of standard channel aligned with the respective measurement points, matching the middle of a dial gauge pointer instrument shall mean +13 um position to prove that the instrument has been proofread better. On the contrary, the dial gauge pointer does not refer to the location in the +13 um, you need to re-adjust the instrument.
Since before matching the inner and outer groove diameter size-sorted, so the left and right sides of the dial gauge instrument package can save not just the middle of an indicator reflecting (xy) the value of a certain size can be optional of the ball. With this out of the bearing radial clearance values meet high standards.
Need to be reminded that the inner and outer supporting the process, to adhere to wash with standard proofreading instrument to prevent stopwatch, otherwise measured (XY value is not accurate, with a value of INA bearing clearance will have error in the application effect, supporting the promotion of the use of instruments, the passing rate of up to 98-100%.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7340A NSK | 200 | 420 | 80 |
| 7240B NSK | 200 | 360 | 58 |