IE S007TREATMENT OCTOBER 2007 — JANUARY 2008 · REPORTS JANUARY–FEBRUARY 2008
Spindles 3U131V and BHU-25: vibration and current down, grinding accuracy up
Spindle assembly vibration dropped, idle current decreased, part roundness improved on all machines. 7–15 % — current draw per phase, 5.2–7.9 → 4.5–6.8 A; 48–72 % — vibration velocity at the spindle bearings and bed, 0.4–2.9 → 0.2–1.4 mm/s; 2–5× — roundness deviation of the test part, 0.004–0.01 → 0.002 mm (2008).
of AVIASTAR-SP JSCapproved by the Director for ETOS and R, certified with the plant stamp
What repeated on all four machines
| MACHINE | SER. No. | SPINDLE AT MEASUREMENT | RUN TIME AFTER TREATMENT | WHAT WAS MEASURED |
|---|---|---|---|---|
| Cylindrical grinder 3U131V | 22 | 1285 rpm | 482 h | current and power, spindle and bed vibration, part roundness |
| Cylindrical grinder 3U131V | 58 | 1285 rpm | 457 h | current and power, spindle and bed vibration, part roundness |
| Cylindrical grinder BHU-25 | 178604 | 1450 rpm | 245 h | current and power, spindle and bed vibration, part roundness |
| Cylindrical grinder BHU-25 | 178610 | 1450 rpm | 325 h | current and power, spindle and bed vibration, part roundness |
Power consumption of the spindle drive at idle
| MACHINE, SER. No. | CURRENT BEFORE, A | CURRENT AFTER, A | CURRENT REDUCTION | POWER REDUCTION PER REPORT CONCLUSIONS |
|---|---|---|---|---|
| 3U131V, ser. No. 22 | 7.4–7.9 | 6.7–6.8 | 9–14 % | 22–26 % |
| 3U131V, ser. No. 58 | 5.2–5.3 | 4.8–4.9 | 7–9 % | 22–27 % |
| BHU-25, ser. No. 178604 | 5.37–5.42 | 4.6–4.8 | 11–15 % | 22–27 % |
| BHU-25, ser. No. 178610 | 5.2–5.3 | 4.5–4.7 | 9–15 % | 18–22 % |
Current and power over three phases, ATK2200 multimeter, idle running. Power is given per the report conclusions; per-phase measurements on BHU-25 give 21–31 %.
Vibration of the spindle bearing units and the bed
| MACHINE, SER. No. | MEASURING POINTS | VIBRATION VELOCITY BEFORE, mm/s | AFTER, mm/s | TYPICAL REDUCTION |
|---|---|---|---|---|
| 3U131V, ser. No. 22 | 15 | 0.52–2.89 | 0.29–1.13 | 22–75 % |
| 3U131V, ser. No. 58 | 15 | 0.44–1.48 | 0.27–1.41 | 17–59 % |
| BHU-25, ser. No. 178604 | 15 | 0.69–1.72 | 0.23–0.58 | 58–72 % |
| BHU-25, ser. No. 178610 | 16 | 0.86–2.84 | 0.23–1.15 | 57–75 % |
SENDIG 911 vibrometer; points on the front and rear spindle bearings and on the bed, idle running and grinding. At the strongest points the reduction reaches 80–84 %.
Machine accuracy measured on a test part
| MACHINE, SER. No. | ROUNDNESS DEVIATION BEFORE, mm | AFTER, mm |
|---|---|---|
| 3U131V, ser. No. 22 | 0.004 | 0.002 |
| 3U131V, ser. No. 58 | 0.004 | 0.002 |
| BHU-25, ser. No. 178604 | 0.01 | 0.002 |
| BHU-25, ser. No. 178610 | 0.004 | 0.002 |
Roundness tester mod. 290, in-house measuring laboratory of AVIASTAR-SP JSC. The item measured was a pin ground on the same machine before and after treatment.
Finding of the plant commission
Current equivalent
Revitalizant gel for compressors and bearings →
Piston, screw and centrifugal compressors; rolling and sliding bearings running in an oil bath; machine-tool spindle units and slideways.
How such units are treated:
About this result:
Method for this machine:
Limits of this report: The results relate to the spindle units of 3U131V and BHU-25 cylindrical grinding machines with plain bearings treated at AVIASTAR-SP JSC in 2007–2008; on other equipment and under other operating conditions the figures may differ.