Mechanical breakdown:
1.Elbow deformation or damage: the elbow is deformed or damaged by external forces during processing, resulting in incorrect bending angle. Replace or repair the elbow.
2.Slider is not smooth: the slider is not balanced from left to right, resulting in inconsistent bending angles. Check the shims and replace the unbalanced parts.
3.Left and right frames not parallel: Left and right frames not parallel will result in inconsistent bends. Use the adjustment tool to make adjustments to the frames.
Malfunction:
1.Power failure or malfunction: If the electrical components of the CNC bending machine fail, the machine will not work properly. Check the cables and plugs and replace the faulty components.
2.Failure of the CNC system: e.g. black screen on the display, program error, etc. Reinstall the program or replace the CNC system.
Hydraulic failure:
1.Failure of the oil pump: the oil pump does not work or does not work properly will lead to the hydraulic system can not work properly. Check the oil pump, replace the faulty oil pump.
2.Deteriorated or leaking tubing: Deteriorated or leaking tubing can cause unstable pressure in the hydraulic system. Replace aged or leaking oil lines.
Failure of the numerical control system:
1.Errors in the program: Errors in the program can cause the machine to fail to machine parts correctly. Rewrite the program or modify the original program.
2.Signal Transmission Failure: A signal transmission failure can cause the machine to not receive commands correctly. Adjust or replace the signal transmitter.
Detailed Troubleshooting and Solutions:
1.The main motor will not start:
Failure of the main motor starting circuit, such as: failure to release the emergency stop button, loose cable wiring, 24V control power supply, etc.; failure of the main motor starting part of the relevant components, such as: thermal relays, circuit breakers, AC contactors, etc., overload protection or have been damaged; and power supply problems.
Solution:
Check whether the main motor starting circuit has an emergency stop not released, loose wiring, 24V control power; check whether the components of the main motor starting circuit part of the overload protection, if there is a need to analyze the reasons, check whether there is damage to the components; three-phase power supply is normal.
2.The slider does not travel down fast enough, work into the bend, or the bend is very slow:
Slider guide is adjusted too tight; the rear blocking material axis is not in place; the slider is no longer on the dead center position; foot switch and other signals do not enter the module; proportional servo valve is faulty; the slider is not to the speed conversion point;System Y-axis bending part of the parameter setting is not good; pressure is not enough, such as: programming operation reasons, machine parameter setting reasons, hydraulic reasons.
Solution:
Check whether the slider guide is suitable; check whether there is a cursor at the actual position of X on the system, or check whether the programmed value of the backstop axis and the actual value are the same in the manual interface; the status of Y-axis on the system should be “1”, if it is “6”, check whether the actual coordinate of Y-axis If it is “6”, check the actual coordinate of Y-axis, the value should be less than the difference between Y-axis and return; according to the electrical schematic diagram, check whether the input signal of foot switch is normal; check whether the feedback of proportional servo valve is normal; check whether the status of Y-axis is “2” to “3”, the actual value of Y-axis should be more than the value of velocity The actual value of Y-axis should be greater than the value of speed conversion point, if not, you need to adjust the parameters of fast forward part;Re-adjust the parameters of the Y-axis bending part; check whether it is the reason for programming operation, or the reason for parameter setting, or the reason for hydraulic pressure; with the help of a pressure gauge, multi meter, etc., you can first detect the signal of the main pressure and the proportional pressure valve, and then check whether the proportional pressure valve and the main decompression valve are stuck, and then check the cartridge and the oil, and then finally check the oil pump and its couplings.
3.Poor slider action and sometimes failure to return:
The slider guide rail is not properly loosened; the slider lock nut is loose; the machine parameters need to be adjusted; the gain and zero position on the proportional servo valve amplifier need to be adjusted; the back pressure valve pressure is not set correctly or is unbalanced on both sides. If the back pressure is set too small, the slider will slowly slide down, and it will shake when working; if the two sides of the back pressure are unbalanced, the slider will twist when running;No-load can not return, may be a parameter problem or hydraulic failure; processing can not return, the work piece angle has not reached the set value.
Solution:
Re-adjust the guide gap; re-locking, if the lock nut and screw with too loose, need to be replaced;If there is a reference curve, should be adjusted according to the reference curve; use the pressure gauge to adjust the pressure of the back pressure valve, and make both sides consistent; debugging Y-axis bending part of the parameters, bending parameters should be based on the actual debugging, part of the gain is too small, the slider will be folded immobile or folded in place, too large the slider will be jittery, should be adjusted to the parameters of the action of the slider does not jitter, the gain as large as possible;Or the diagnostic program in the left and right valve bias setting is not good, too small Y-axis can not be in place, too large Y-axis can not be unloaded; if it is a hydraulic failure, you need to check the main pressure, check the PV valve S5 has been in the powered position; may be the Y-axis bending part of the parameter gain is set on the small side, it can be increased appropriately; or the pressure is not enough to analyze the reasons for insufficient pressure, whether it is the cause of the programming or the signals, the cause of the hydraulic part;Programming reasons are mainly mold selection, plate thickness, material, work piece length, bending method, etc. Hydraulic reasons are mainly whether the oil pump is internal leakage, whether the proportional pressure valve is contaminated or damaged, whether the cartridge is blocked, whether the oil has been contaminated, etc.; the main reason is the programming and operation reasons, check the programmed program and the processed work piece.
4.Main motor auto stop, thermal relay, circuit breaker protection:
Proportional pressure valve, the main pressure reducing valve is stuck, the machine has been in the pressurized state; cartridge clogging, the oil out of the oil is not smooth, the oil pump pressure has been very high; the oil has been used for too long, has been contaminated; the oil quality is too poor; circuit breaker, thermal relay out of the problem, not up to the rated current on the action; the system to control the pressure output part of the failure to send out an incorrect signal, so that the proportional pressure valve has been working.
Solution:
Clean proportional pressure valve, main pressure reducing valve; replace filter element and check fluid for contamination; replace fluid filter element immediately; replace with recommended fluid; replace circuit breaker, thermal relay; check system output.
5.Arbitrary valve stuck and cylinder slipping:
The oil has been used for too long and has been contaminated; the quality of the oil is too poor; there is no aging of the rubber skin of the oil inlet in the tank; the back pressure valve and poppet valve are dirty or damaged; the inner wall of the back oil cylinder is strained;If the slider stops at any position slowly down, 5 minutes down less than 0.50mm, is normal, this phenomenon is mainly due to the characteristics of the hydraulic fluid.
Solution:
Customers are advised to change the fluid on time; replace the recommended fluid; replace the oil-resistant rubber plate; clean the back pressure valve and poppet valve, and replace them if they are damaged;Re-adjust the back pressure valve pressure according to the standard; replace the glazing ring and check the cause of glazing ring strain and wear; generally due to oil contamination, replace the cylinder barrel and seals; no treatment is required.
6.The pressure automatically calculated by the system is greater than the mold impedance:
The selection of the lower mold during programming is not reasonable; the impedance of the mold is not set correctly; the bending method is not selected correctly during programming; the parameters of the machine constants have been modified, such as material parameters, unit selection and other parameters.
Solution:
The relationship between plate thickness and lower die opening should be followed to select the die; set the die impedance correctly; check the programmed program; and check the machine constant parameters.
7.The angle of the machined work piece is not accurate:
If the error is very large, may be programming errors, slider connection loose, scale failure, etc.; normal a little error, can be corrected on the system, after the correction can work stably, is normal; Angle is unstable, often change, may be connected with the slider loose, scale failure, material material, etc. Related.
Solution:
Check the running program, focus on checking the program in the mold, material, plate thickness, work piece length, bending mode is consistent with the actual operation, the slider connection is not loose, grating scale connection is firm; normal a little error, can be caused by a variety of reasons.For example: the error between the programmed material thickness and the actual thickness used; the uniformity of the material, the wear and tear of the mold, the operation and other reasons; check the Y-axis repetitive positioning accuracy, check the slider connection, the scale connection is normal or not, if it is normal, it is likely to be related to the material material.
8.The size of the machined work piece is not accurate:
Dimensional instability and frequent changes may be related to the machine power supply, servo drives, servo motor encoders and associated cables, systems, screw mechanical connections, timing belts (wheels), etc;There are deviations in size, but they are stable, mostly related to the parallelism, straightness, parallelism and perpendicularity of the rear blocking crossbeam, and the parallelism and perpendicularity of the blocking fingers; when the bending edge is used for positioning, the angle of this bend is greater than 90°, resulting in the dimensions being small.
Solution:
Check the rear stopper axis shaft repetitive positioning accuracy, generally less than 0.02mm, if the difference is large, you need to check the possible factors one by one, if it is caused by the servo drive, servo motor encoder, system, etc., it is best to deal with by the manufacturer;First check the crossbeam parallelism and straightness, then check the blocking finger parallelism and perpendicularity; if the bending edge is used for positioning, try to make this bend no more than 90°.
