how to do maintenance of power press machine
Publish Time: 2020-07-14 Origin: Site
How to do maintenance and inspection of a power press machine
Routine inspection
The power press machine inspection and maintenance are very important for keeping its safety operation and prolonging its working life, so the inspection and maintenance before operation must be carried out carefully.
ITEM | STANDARD |
pipelines | There are not leakages on air, lubrication and hydraulic pipelines |
circuits | No damaged & well connected |
Air pressure | The air pressure is about 0.5Mpa |
Seeper | No water in pneumatic dual component, filter relief valve and mist catcher |
Oil | Enough oil in gear case, ball coupling between ram and link, hydraulic overload protection oil bath and lubrication pump |
Flywheel direction | Start the main motor to find out if the flywheel run in accordance with the arrow marked there |
Slide movement | INCHING |
SINGLE | |
CONTINUAL | |
Emergency stop | Press the E-stop button then the slide and the main motor will stop immediately |
Press and hold the E-stop button. At the same time, do other action, the movement will not be fulfilled | |
Guide way | Five minutes later, the surface of the guide way will be fully lubricated and no thermal hazards |
Opto-electronic | Stop immediately as shield the beam in operation |
After opto-electronic emergency stop, the machine cannot be started without resetting the module first |
CAUTION: If find out any circumstance do not conform to the standards, fix or report them timely.
Periodical Inspection
After a period of operation, some errors may occur such as parts loose, dirty and less oil. If not pay attention to such conditions, they may make operator inconvenient even seriously influence the safety operation and machine life.
Inspection once every three months (500 hours)
ITEM | METHOD & TOOLS | STANDARD |
Before switch on the power | ||
The screw and nuts | Use spanner to turn them | The screws and nuts of main parts are tightened (such as main motor base, the cover of the flywheel, guide way, worktable and balancing cylinder etc). |
Lubrication system | Optical check the oil gage | Enough oil in lubrication pump and link ball coupling. Connectors are tightened and no leakage. |
Electrical system | Turn cam by hand | With proper looseness |
Optical checking then use ohmmeter to find out if they are well connected | The connector and roller of cam are well connected | |
Optical checking | The spring, bolt and pin on cam shaft are ok | |
Optical checking | Thermal relay connectors are ok | |
Optical checking | All switches and buttons are clean and tightened | |
Turn with screwdriver | Terminals in electric cabinet are tightened | |
The screws to fix electric cabinet are tightened | ||
The v-belts | Optical checking | No twisting, no damage and being properly tensioned |
After main motor is started | ||
When starting | Optical checking and hearing | When starting the main motor, no racing, no abnormal noise |
When flywheel speeds up, no obvious vibration | ||
No abnormality with clutch –brake and dual valves | ||
Electric system | Optical checking | No abnormality with switches and buttons |
Driving &Operation | Optical checking | The hand of the crankshaft indicates the right angle |
Optical checking and hearing | No abnormal vibration and noise when starting the slide | |
Optical checking | The slide stops at top dead position in single and continual operation | |
Hand touching | No overheat in bearings and sliding part | |
Optical checking | No abnormality in every slide stroke running | |
Optical checking | Repeated operation of inching, single and continual stroke running are ok | |
Slide adjustment | Optical checking | The showing value is right the height of the shut mold |
The function of slide adjustment is ok | ||
The limit switch can really stipulate the upper and lower limits of the slide adjustment | ||
The function of air ejector is ok | ||
Inspection once every 6 months (1,000 hours):
The items are the same as those of inspection of every 3 months. Replace grease at the slide ball coupling after 6 months (or 1,000 hours) operation.
Inspection once every year:
The items that must be inspected once every year for the safety operation and long working life as follows:
ITEM | METHOD & TOOLS | STANDARD |
THE BODY | Optical checking after removing the back cover | No split and other damage on the surface |
Check the tightness of the screws and nuts by spanner | Be properly tightened | |
Driving system | Optical checking | No abnormality on the surface of the crankshaft and bearing: good grease filling condition |
Check axial and radial run-out of the flywheel and grease filling condition | No abnormality and filling properly | |
Check tightness of cam shaft and driving gear pair | Properly tightened | |
Check chain tightness | Properly tightened | |
Check ram motion, bearing and gear shaft | No abnormality or split | |
Slide driving | Check slide starting as ram adjustment within its range Check start and stop of upper and lower limit switches of slide | Stop at upper and lower limits correctly |
Check piston rod and the appearance in balancing unit | No crack, damage or obvious air leakage | |
Check if guide way clearance is proper | Proper clearance and flexible motion (refer to “ram and guide way adjustment”) | |
Air system | Check piston starting condition | No abnormal condition |
Stop main motor and check operation by inching | No abnormal condition when starting air supply or exhaust | |
Check muffler, pressure relay, oil mister, filter | No clogging or damage | |
Air reservoir and pipe connector | No damage, crack or air leakage |
6.1 Inspection once every 3 years:
ITEM | MOTHOD | STANDARD |
Accuracy calibration | Calibrate machine accuracy as all clearance, parallelism, verticality and flatness | Based on “JB1280-83 Gap Frame Presses Accuracy” |
Clutch-brake | Check wearing surfaces of friction disks and braking disks | Replace them if necessary |
Check if spring is deformed or broken | Replace it if necessary | |
Check if seal ring is aged or air leaky | Replace it | |
slide | Check wearing degree of ball coupling and screw | Replace it |
Remove and clean seal ring, replace grease | Clean it | |
Slide guide way and balancing cylinder piston | Check wearing degree of ram guide way | Repair it |
Check wearing degree of balancing cylinder piston and piston rod | Repair or replace it | |
Sealed bearing | Check or replace with clean grease | Clean and replace it |
Cable, rubber tube | Check if metal hoses, cables or rubber tubes of motive parts are aged or damaged | Replace with new ones |