ABNORMAL SITUATION:Heat and noise
II、ABNORMAL ANALYSIS:
(1)SP. RUNNING SOUND:N/A
(2)SP. OIL-AIR LUBRICATING:Good
(3)SP. RUN-OUT:
A、Top of tail:N/A
B、Nose of taper:N/A
C
、Sp. 300 ㎜ test bar (Run-out/Direction) :N/A
(4)VIBRATION DATA:
A
、Acceleration G value(RMS):N/A
B、Speed(mm/s):N/A
(5)Bearing situation:Burned damage
(6)SP. DAMAGED DESCRIPTION:
The spindle unit is not able rotate smoothly by hand after received in factory. During
disassembly, spindle out looking of moving keys have wearing mark from holder. Inside of
bearings have damaged at bottom side. As following figure, bearing retaining ring is
breaking. Spindle noise is coming from this part of abnormal working. After a period time of
running, bearing retaining ring is becoming weak and broken to make bearing heat up
abnormally running.
Broken bearing
location
Top
Sp. Nose
Moving keys are having wearing marks.
Bearing retaining ring is broken.
Air-oil lubricant is supplied on bearing balls.