Detailed explanation of NSK bearing measurement specifications

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Detailed explanation of NSK bearing measurement specifications

Source: China Bearing Network Time: 2013-09-12
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1. The rule of the scale benchmark: the measurement pair of the bearing scale public service is selected by the comparison measurement method; the rule quantity block or the specification piece is used as the scale reference for the comparison measurement; the gauge block needs to conform to the rules of the standard JB/T1078 “quantity block”; It is necessary to conform to the rules of the competent authority of the manufacturer.
2. The rules for measuring the appearance: it is necessary to pass the calibration when measuring the appearance; and it has the accuracy and amplification ratio suitable for the measured NSK bearing.
3. Rules for measuring area: measure the inner or outer diameter of the bearing of HR32022E; the domestic rule is measured within the area where the south end of the ferrule is the largest chamfering coordinate; while the foreign rules are twice at both ends of the ferrule. Measure within the area of ​​the chamfer coordinates.
4. Allowable measurement error: In principle, the measurement error can be allowed to be less than 10% of the public service.
5. The radius of the probe and the pressure of the gauge: in order to reduce the measurement error; it is necessary to be within the range of energy; strive to reduce the pressure of the gauge - measure the force; and increase the radius of curvature of the probe. Measuring the inner and outer diameter of the NSK bearing Time; the measurement force used and the radius of curvature of the probe can be selected.
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Optimal test method for drilling parameters:
1. Drill for 5 minutes with initially selected proper WOB and moderate RPM (60~100r/min) and record the ROP (as shown in the table below).
2. Moderately inctease WOB and keep the same RPM and drill under this WOB for 5 minutes and again record the RPO (as shown in the table below).
3. Decrease WOB b the same extent and tepeat step 2.
4. Find the WOB in the tow groups of test than can yield highest ROP.
5. Properly change RPM under optimal WOB and record the ROP (as shown in the table below).
6. Select the RPM at the highest ROP.
7. Set the drilling parameter at the best combination:60KN   RPM: 120r/min


Times

RPM:100r/min

WOB:60KN

WOB

(KN)

Drilling hour

(Min/m)

RPM

(r/min)

Drilling hour

(Min/m)

1

80

8

100

7

2

100

9

120

5.5

3

60

7

80

8

Select

60

7

120

5.5


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