What is the use of broken wire protection on wire cutting machine tools

"Broken wire" is a situation that is often encountered in the work of online cutting machine tools, and at this time, "broken wire protection" plays an important role. If the wire EDM breaks, the relay of the wire cutting in the middle will automatically disconnect and cut off the power supply. There is a conductive block in the middle of the wire-cut upper wire frame, which is linked to the same set of switch contacts with another conductive block of the wire frame. At the same time, it is also connected in parallel with the "broken wire protection" switch on the button plate. If there is no molybdenum wire between the two conductive blocks, the small relay of the wire cutting machine will be automatically disconnected, and the "broken wire protection" switch will replace the molybdenum wire. "It is equivalent to molybdenum wire.


"Broken wire protection" has both positive and negative effects on wire EDM. It avoids the phenomenon of molybdenum wire fluttering and water splashing randomly when the middle wire is broken. Negative effect one, to increase the protection of broken wire, it is necessary to add a conductive block, which makes the frictional resistance of the wire up and down different, resulting in inconsistent tension of the molybdenum wire; When cutting aluminum, adding one more conductive block is the danger of one more wire.

Here is a reminder, do not continue wire threading immediately after wire-cutting starts wire break protection. One is that the molybdenum wire is not easy to wear at this time; the other is that cutting the workpiece after wearing the wire will leave traces of broken wires. Because the modern mold industry generally has high requirements for molds, too many broken wire marks on the workpiece are allowed.