Fast wire cutting machine in use in the problems and failure prevention

First, breaking the fault causes and treatment of molybdenum wire
Broken molybdenum wire is the wire cutter operator most worried about things, ranging from increasing the workload, while causing the mold scrapped, it should be taken seriously, the following reasons will be broken off the wire and troubleshooting methods are as follows:
1, the beginning of cutting that is broken molybdenum wire
General automatic frequency tracking machine tool into the workpiece from the outside of the method can reduce the molybdenum wire in the starting point broken wire probability, while ensuring a good supply of cooling liquid to absorb the explosive discharge of molybdenum wire to produce the disturbance, the best distance of the workpiece Spray 5-10mm up and down, so that the coolant can be better wrapped molybdenum wire. Processing methods: ① processing current is too large, feed instability; adjust the electrical parameters, reducing the current; just cut into the current should be properly adjusted small, and so cut into the workpiece side wall without spark then increase the current. ② molybdenum wire shaking powerful; check the wire part of the system, such as the guide wheel, bearings, wire barrel anomalous beating, vibration. ③ surface burrs, or non-conductive oxide or sharp edge; remove the oxide, burrs.
2, the cutting process suddenly broken molybdenum wire
Molybdenum wire in each discharge between the workpiece itself will also be damaged, but to a very small extent, so after the new molybdenum wire is best to cut with a small energy processing parameters to damage smaller until the molybdenum wire The color is basically white and then switch to the normal high current for cutting. Of course, it is better to let the molybdenum wire run for 5-10 minutes before the molybdenum wire is cut for cutting, so that the original internal stress is released. Approach: ① choose improper electrical parameters, the current is too large; the intermittent file transfer large, or reduce the number of power tubes. ② improper feed adjustment, suddenly flicker, frequent open short circuit; improve the level of operation, according to the principle of feed rate adjustment, adjust the feed potentiometer to feed stable. ③ improper use of working fluid, such as the wrong use of ordinary machine emulsions, emulsions too dilute, the use of time is too long or dirty; the use of wire cutting special working fluid. ④ pipeline blockage, work flow greatly reduced; pipe cleaning. ⑤ conductive block failed to contact with the molybdenum wire or molybdenum wire has been pulled out of the dent, resulting in poor contact; replace or move the conductive block to a position. ⑥ cutting thick pieces, the intermittent is too small or not suitable for cutting thick pieces of working fluid; increase the duty cycle and use good run series or Nanguang-I, DX-4 and other suitable thick work piece cutting fluid. ⑦ pulse power cut-off diode performance deterioration, the processing of negative waves larger, so that loss of molybdenum wire increased within a short time; replace the clip diode. ⑧ molybdenum wire poor quality or poor storage, resulting in oxidation, or when using a small iron wire on the wire and other inappropriate tools Zhang silk, so that silk damage; replacement of molybdenum wire, the use of wire wheel tight wire. ⑨ filament drum speed is too slow, the molybdenum wire stay in the working area for too long; a reasonable choice silk gear. ⑩ cut thick workpiece molybdenum wire diameter selection is too small; choose the right diameter molybdenum wire. Working fluid is pulsed discharge medium, improper selection of working fluid, not timely replacement, processing efficiency and stability will deteriorate, the failure rate of broken wires increases. In practice, if the cutting and tracking instability, may be appropriate to increase the working fluid concentration, or directly add detergent or soap tablets. Should pay attention to the cutting of different materials, different composition of the working fluid, should pay attention to the comparison and selection. Continuous use for about 8 days, or working fluid black agglomeration, to be promptly replaced. For the liquid supply system, to ensure that the nozzle up and down spray liquid equilibrium, for liquid flow to ensure chip discharge and discharge processing requirements.
3, there are regular off, and more on one side or both sides of the commutation off, the workpiece is close to cut off molybdenum wire
High-speed wire cutting machine because it is open-loop control, such as wire, tight wire, select the processing standards, frequency tracking, etc., require the operator to complete by hand, and these improper operation will result in abnormal broken wire. Processing methods: ① wire cylinder commutation, failed to cut off the high-frequency power supply in a timely manner, the molybdenum wire blown; adjust the proximity switch, if still invalid, you need to test the circuit part, to ensure that the first off and then switching to high-frequency. ② deformation of the workpiece material, clip off the molybdenum wire, molybdenum wire before the break will appear short circuit, the workpiece falls, breaking the molybdenum wire; select the appropriate cutting route and materials and heat treatment process, the deformation as small as possible, The magnet sucks the workpiece or supports the workpiece with the tool without falling.
4, idling broken molybdenum wire
Treatment: ① molybdenum wire stacked wire; check whether the molybdenum wire in the guide groove, check the screw thread organization row clearance is too large, check the spool axis is vertical with the wire frame. ② wire cylinder rotation is not flexible; check the wire cylinder cracks into the debris. ③ electrode wire card slot in the conductive block; replace or adjust the conductive block position.