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Bearing clearance rate and the use of matching instruments
Source: China Bearing Network Time: 2013-04-06
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Therefore, the bearing clearance is not only a primary parameter for determining whether the bearing of the qualified product parts can be qualified; it is also an important factor for the normal operation of the bearing. The clearance value does not conform to the skill specification; it will affect the load rolling. The reasonable dispersion between the bodies, the rotation accuracy of the bearing, the oscillation value, the lifespan, etc. will be affected, so it is undoubtedly important to improve and ensure the clearance rate of the bearing.
Second, analyze the causality of the radial pass rate product quality in the process of composition; once the problem is found, it is necessary to find the cause immediately. Use the causal analysis method; let us analyze the low pass rate of the radial clearance.
There are five major factors affecting the bearing clearance quality. If we do not think about the data and environmental factors for the time being, we can first analyze the influence of the testing instruments, process methods and personnel quality on the quality of the bearing clearance; in the past, the bearing inner and outer rings and the steel ball are matched. The method is to sort the diameter error of the inner and outer ring channels by instrument; and calculate the inner diameter channel diameter scale value and the outer outer ring channel diameter scale value according to the gauge clearance; then select the corresponding scale copper After the three are installed; use the axial clearance viewer to test the upper and lower limits of the axial clearance; for those that do not meet the skill requirements; the three are then selected from the beginning. As for the radial clearance value of the bearing, the axial clearance is used. The gap value is known; it is difficult to ensure accuracy. Because the measured axial clearance value is only the upper and lower limit values; and the upper and lower limit values ​​are different due to the difference in the curvature of the channel and the method of each person. Difference; so the radial qualification rate of the bearings selected by this method is unstable. When the time is high and low; the number of rework is more frequent; the quality of the product cannot be confirmed.
Third, the use of matching instruments; improve the radial clearance rate in the premise of ensuring the processing quality of the bearing parts and ensuring the accuracy of the test instrument; using the bearing inner and outer ring special matching instrument for the bearing inner and outer ring reasonable matching ; is a useful way to improve the radial clearance of bearings:
1. The supporting principle of the matching instrument is in the process of installing the bearing; the clearance of the bearing is necessary to conform to the normative rules; the formula of the radial clearance error of the radial ball bearing is:
U=XY-2Z
Or XY=U+2Z
Where U = radial clearance of the radial ball bearing without load; um
X = outer groove diameter error; um
Y = inner groove diameter error, um
Z=steel ball diameter error, um
The U value in the formula can be consulted from the national standard; the Z value is now marked in the steel ball view. The mission of supporting the instrument is to sort the bearing inside and outside the scale; use the matching instrument to measure it at one time ( The xy) value is then selected after the steel ball of the appropriate size is installed; the radial clearance value is then viewed with a radial clearance meter.
2. The supporting method firstly corrects the matching instrument with the inner and outer groove diameter scale specifications. Because the matching instrument is measured by the two-point comparison method; therefore, the two specifications of the calibration instrument are the inner ring and the outer ring groove diameter specification. The matching instrument is equipped with three dial gauges; the left and right dial gauges reflect the inner and outer groove diameter errors; the center one dial gauge reflects the value of (xy) at a time.
For example, the practical diameter error of the outer ring gauge channel is +8 um; the actual diameter error of the inner ring gauge channel is -5um; then xy=+8-(-5)=13um.
When the school presses the time; the gauges of the channel diameter in the table are aligned with the respective measuring points; the pointer of a dial gauge in the center of the instrument should be in the direction of +13 um; the instrument is now corrected. Otherwise; the dial gauge The pointer does not point to the +13 um position; it is necessary to adjust the instrument from the beginning.
Because the inner and outer groove diameter scales have been sorted well before the matching; therefore, the dial gauges at the left and right ends of the matching instrument can be omitted; only one central dial gauge reflects the (xy) value to select a certain scale. The steel ball. The radial clearance value of the bearing is matched with the high specification requirements.
Need to be prompted; in the supporting process of the inner and outer rings; to adhere to the use of standard parts to correct the instrument; avoid running the watch; otherwise; measured (XY values ​​are not accurate; the bearing clearance value will be wrong In the application of the role; the implementation of the use of supporting instruments; qualified rate of up to 98-100%.
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