cnc engraving and milling machine wholesale, which belongs to the field of electrical processing, is a study by the former Soviet Union's Mr. And Mrs. Lazarekos on the phenomenon and causes of the switch contact damaged by spark discharge corrosion, and found that the instantaneous high temperature of the electric spark can make the local metal melt, oxidize and corroded. Thus pioneered and invented the EDM method.

The method of fault occurrence and solution is as follows:

1. Broken wire fault analysis and elimination method Broken wire fault is one of the common faults of cnc engraving and milling machine wholesale. There are many factors causing this fault, and the analysis is as follows.

① At the beginning of cutting the workpiece, the reason for the broken wire is: a. the feed is unstable, the start of the cutting speed is too fast or the current is too large. b. When cutting, the working liquid is not normally sprayed. c. Molybdenum wire winding on the silk storage cylinder is inconsistent, resulting in local shaking. d. The guide wheel and bearing have been worn or the guide wheel axial and radial runout is large, resulting in severe shaking. e. The wire stop rod of the wire rack is not adjusted properly, and the position of the wire stop is inappropriate, resulting in silk overlap. f. Burr, oxide or sharp edge on the surface of the workpiece. Exclusion measures: a. At the beginning of cutting, the speed should be slightly slower, and depending on the material thickness of the workpiece, gradually adjust the speed to the appropriate position. b. Eliminate the fault that the working liquid does not normally spray out. c. Try to tighten the molybdenum wire to eliminate the jitter phenomenon (if necessary, adjust the position of the guide wheel, so that the molybdenum wire * falls into the middle slot of the guide wheel). d. If the effect of tightening the molybdenum wire and adjusting the position of the guide wheel is not obvious, the guide wheel or bearing should be replaced (the guide wheel and bearing are generally replaced once every 3 to 6 months). e. Check whether the molybdenum wire is in contact with or against the inner side of the stop rod. f. Remove burrs, oxide and sharp edges on the surface of the workpiece.

② The reason for the sudden break of wire in the cutting process: a. The main reason for the break of wire when the storage cylinder is reversed is that the high-frequency power supply is not cut off when the storage cylinder is reversed, resulting in the burning of molybdenum wire. b. The heat treatment of the workpiece material is not uniform, resulting in the deformation of the workpiece and the clamping of the molybdenum wire. c. Improper selection of pulse power supply electrical parameters. d. Improper use of working fluid, too thin or too dirty, and working fluid flow is too small. e. Conductive block or stop rod is not in good contact with molybdenum wire, or has been cut into a dent by molybdenum wire, resulting in wire clamping. f. Molybdenum wire quality is not good or has been mildew brittle.

Troubleshooting measures: a. Eliminate the failure of switching the silo cylinder without cutting off the high-frequency pulse power supply. b. The workpiece material requires uniform material and appropriate heat treatment, so that it is not easy to deform when cutting, and the cutting efficiency is high, and it is not easy to break the wire. c. Reasonable selection of pulse power parameters. d. Keep the working liquid clean and prepare the working liquid reasonably. e. Adjust the position of the conductive block or wire stop, and replace the conductive block or wire stop if necessary. f. Replace the molybdenum wire, cutting thicker workpieces to use a thicker molybdenum wire processing.

2, some other broken wire failure:

① The guide wheel does not turn or is not flexible, and the molybdenum wire and the guide wheel cause sliding friction and pull off the molybdenum wire. Should be re-high-speed guide wheel, electrode wire injury, will also cause the process of broken wire, tight wire, be sure to use tight wire wheel tight wire, can not use inappropriate tools.

② When the workpiece is near the end of cutting the wire, this phenomenon is often the deformation of the workpiece material, the electrode wire is broken, and there will be a short circuit before the wire is broken. The main solution is to choose the correct cutting route and material, so as to minimize deformation.

③ When the workpiece is cut, the electrode wire can be dropped and broken. Generally, the magnet can be used to hold the workpiece when the workpiece is cut quickly to prevent the electrode wire from falling and breaking. ④ When the wire is broken during empty operation, it can mainly check whether the molybdenum wire is in the guide wheel groove, whether the molybdenum wire is arranged or not, whether the silk storage cylinder is flexible, and whether the conductive block stopper rod has been cut out.

3, machining workpiece accuracy is poor

① The guide wheel radial runout or axial movement is large, should measure the guide wheel runout and movement and movement error (tolerance axis 0.005mm, radial 0.002mm), if not meet the requirements, need to adjust or replace the guide wheel and bearing.

② For the sliding screw nut pair, the gap between the screw and the nut should be adjusted and eliminated.

(3) There is a gap in gear meshing, it is necessary to adjust the position of the stepper motor and adjust the misalignment of the spring anti-backlash gear to eliminate the gear meshing gap. ④ Stepper motor static moment is too small, resulting in loss of step. Check whether the stepper motor and 24V drive voltage are normal. ⑤ Deformation error caused by improper heat treatment of the workpiece.

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