Page 26 - stanochny park

PROFESSIONAL ADVICE
● check the quality of the
automatic lubrication of the guides
of the table travel and the vertical
stroke of the grinding head;
● check on the control panel
the operation of signaling devices
of the zero position of the grinding
head;
● adjust the longitudinal
feed of the table and, if necessary,
the transverse feed of the grinding
head.
AFTER ACTIVATION OF THE
MACHINE:
● check the operation of the
hydraulic unit pump;
● check the serviceability
of manual control of the table and
grinding head;
● check the operation of
the travel lock of the grinding
headstock with the limit
switch;
● check the operation of
the suction system of grinding
(abrasive) dust;
● check the operation of
the coolant supply system.
WEEKLY:
● check the pressure in
the hydraulic system using a
manometer in test mode;
● check the oil level in
the hydraulic unit tank;
● Lubricate (using a
grease nipple) the bearings of
the machine control levers.
ONCE TIME IN THREE
MONTHS, change the oil in the
grinding head. After draining
the old oil, pour kerosene into
the grinding headstock and
turn on the grinding wheel for
one minute. Then drain the
kerosene and add fresh oil. An
analogue of Czechoslovakian
oil is Russian oil of the I 5A
brand. Refueling rate – 0.3 l.
Navigate through the viewing
window. The oil level should
be in the middle of the window.
TWO A YEAR to completely
replace the coolant with cleaning
(flushing) the coolant tank and
magnetic dirt trap (separator).
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Table 1.
Grinding defects on the BRH 20A II.
Nature of the defect
Long, regular layered pads
("Chess board")
The reason is vibration:
- imbalance of the grinding wheel;
- vibration of the electric motor, incl.
excessive tension of drive belts;
- radial (axial) runout of the spindle;
- high feed rate;
- defect of the bearings of the spindle of
the grinding headstock.
Narrow, irregular and relatively deep risks. Smooth the grinding wheel with a blunt
The reason is a rough, loose grinding
wheel.
Isolated deep risks.
Causes:
- decomposition of the binder of the
grinding wheel,
- high feed rate.
Transverse "waves".
The reason is torn edges of the grinding
wheel.
Irregular risks.
The reason is unclean coolant.
Irregular risks.
The reason is unclean coolant.
Deep wrong risks.
Before cleaning (flushing) the dirt trap, the drive motor and gearbox The reason is the loosening of the
must be separated from it. Before reinstalling the gearbox, replace tightening screws of the adapter flanges of
the oil in it. the grinding wheel.
The brand of oil is And 20A. Oil level control is the Pollution (salting) of the grinding wheel.
middle of the inspection window. Causes:
- use of a grinding wheel with fine grain; the grinding wheel.
ONCE A YEAR, make a complete oil change in the hydraulic - poor-quality dressing of the grinding
system with the replacement of the filter element of the oil wheel;
- improper cooling of the grinding wheel.
filter and cleaning the suction box. The level of the new refill The appearance of colored spots on the
oil of the I 20A brand (130 l) should be checked by the upper grinded part.
inspection window (pos. 10, fig. 2). The oil level must not Causes:
exceed the middle upper window or be below the middle of - incorrect grinding mode;
the lower window. The machine operating time is recorded - loosening the tightening of the grinding
by the operator-grinder in a special (watch) magazine, wheel;
- loosening the tension of the drive belts
which is present on the grinding site. In the same journal, he of the spindle of the grinding headstock.
notes the occurrence of various malfunctions (malfunctions) Explicit defective grinding.
in the operation of the machine. This journal is a technical Causes:
reporting document. Control over the observance of the - wear of the grinding wheel;
correctness of its management is assigned to the head - increase Vokr. grinding wheel due to a
(master) of the grinding site. decrease in its diameter.
PROFESSIONAL ADVICE
Defect repair method
1. Check the balancing of the grinding
wheel.
2. Check the tightening of the nuts on the
base plate el. engine and drive belt tension.
3. Adjust the clearance in the bearings of
the spindle of the grinding head.
Note. Spindle bearing clearance can only be
adjusted by a qualified technician.
4. Reduce feed rate. The optimum speed is
10-15 m / min.
5. Replace defective bearing.
Note. The operation according to claim 5 is
performed only by a qualified fitter.
diamond at low speed and low feed.
If editing is not possible, replace the circle.
1. Edit the grinding wheel with the
appropriate diamond. After editing, clean
the circle with a metal brush and rinse with
a stream of water.
2. When using a grinding wheel with an
organic binder, do not use coolant with
soda ash.
3. Reduce feed rate.
Round off the grinding wheel with a
mandrel.
1. Clean the coolant tank of dirt and solids.
2. Eliminate drafts in the room where the
machine is installed.
3. Check the operation of the magnetic dirt
cleaner (separator) to capture mechanical
impurities from the coolant tank.
1 Tighten the adapter flange screws.
2. Check the condition of the gaskets at the
ends of the grinding wheel and between the
wheels when they are doubled.
1. Use a larger grinding wheel.
2. Use a sharper diamond when dressing
3. Adjust the coolant stream to the full
width of the grinding wheel.
1. Change the grinding mode.
2. Check the tightening of the grinding
wheel.
3. Tighten the spindle drive belts.
Replace grinding wheel.
Note. The grinding wheel is used no more
than half its diameter. At the same time,
the minimum wear diameter of the grinding
wheel for the BRH 20AII machine is 120
mm.
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