Common Faults of Bending Machines and Troubleshooting Methods
Jun.04.2024
| number | Fault | Possible causes of the fault | Method of exclusion |
| 1 | The oil pump does not deliver oil or the oil supply is insufficient | Oil pump reverse | Change to clockwise rotation direction |
| Coupling loose | Re-secure the coupling | ||
| Oil level too low | Refuel to at least 80% of the tank capacity | ||
| Oil pump does not start | Check the electrical parts | ||
| Oil pump damage | Replace the oil pump | ||
| The oil suction pipe or oil suction filter is clogged | Clean the filter | ||
| 2 | Insufficient system pressure | Insufficient oil supply | Same as item 1 |
| The throttling hole is blocked and the overflow valve is faulty. | Check, clean or repair the relief valve | ||
| The reversing valve is stuck in the middle position | Check, clean or repair the reversing valve | ||
| The solenoid coil of the reversing valve is damaged | Replace the solenoid coil | ||
| The pressure gauge and switch are damaged, and the displayed pressure is incorrect. | Check or replace the pressure gauge and switch | ||
| 3 | Abnormal noise and vibration in the hydraulic part | The oil suction pipeline is leaking and white foam appears on the liquid surface | Check the pipeline to ensure tightness |
| The oil suction resistance is too large, the oil suction filter is clogged, the oil viscosity is too high or too low | Clean or replace the oil filter, replace the hydraulic oil with the appropriate viscosity | ||
| The hydraulic pump input shaft is not coaxial with the motor shaft | Check and readjust | ||
| 4 | Oil Leakage | The cylinder seal, the O-ring between the valve plate and the valve are damaged or aged. | Replace seals |
| Loose pipe joints | Tighten the joint or replace | ||
| Hose connection is loose | Tighten the joint or replace | ||
| There are foreign objects on the sealing surface. | Tighten the screws after removing foreign matter | ||
| 5 | Oil temperature is too high | Insufficient oil in the tank | Add hydraulic oil |
| The oil viscosity is too high | Adjust hydraulic oil type | ||
| System pressurization time is too long | Adjust the pressurization time | ||
| The pressure control valve is too high | Reduce the pressure | ||
| Oil pump bearing damage | Replace bearings | ||
| Large internal leakage of valve group | Check, repair or replace valve | ||
| 6 | Slider crawl | Air enters the hydraulic system | Run at no load for a while to exhaust the air |
| The cylinder and guide sleeve are not coaxial | Replacement of guide sleeve | ||
| The clearance between the slider and the guide rail is too small, the lubrication is poor and the movement resistance increases | Adjust the guide rail clearance and add lubricating oil | ||
| The cylinder is seriously damaged | Disassemble the cylinder for inspection and repair | ||
| Relief valve stuck | Check and clean the overflow valve | ||
| Excessive leakage inside the oil cylinder | Check the cylinder seal and replace it | ||
| The center of the cylinder and the guide rail are not parallel | Adjust the parallelism of mechanical parts | ||
| 7 | Different bending angles | The slider is not consistent with the left and right free heights | Adjust the height of the torsion shaft connection part on the rear side of the slider to ensure that the slider is free and at the same height on both sides. |
| The left and right heights are inconsistent when pressurizing | Adjust the fine-tuning screws on the left and right cylinders, and connect the synchronous shaft after the left and right cylinders are completely consistent. | ||
| The connection between the piston rod and the slider is loose | Tighten the loose bolts to eliminate the gap | ||
| The mold fixture adjustment pad is loose | After adjusting the upper die to be parallel, tighten the clamp screws | ||
| Loose or damaged bearing | Check and remove the bearing for replacement |
