What should I do if the wire is broken in the middle wire cutting process?

 

When machining workpieces, wire cutting sometimes breaks. If both ends of the wire feeding barrel are normal, they can be rewired for processing. Once the middle is broken, the molybdenum wire is wasted. Then, what should I do if the wire is broken in the middle wire cutting process?

 

1. Poor quality of molybdenum wire: choose good quality molybdenum wire.

 

2. Wrong processing parameters: select appropriate processing parameters for different materials and workpiece thicknesses. Please note that it is easy to disconnect the wire when selecting the condition of high current. The conductive block is worn from the groove and the wire is clamped: adjust the conductive block to a new position and replace it if necessary.

 

3. Improper concentration of cutting fluid: keep the concentration of cutting fluid at 11-12.5%.

 

4. Accuracy of the guide wheel (especially the supporting guide wheel): the bearing should be replaced regularly in strict accordance with the maintenance instructions of the machine tool, and the guide wheel or bearing should be replaced if necessary.

 

5. The flushing fluid is too small to effectively flush into the cutting seam, and poor discharge conditions will lead to wire breakage: set a reasonable flushing fluid size; Regularly check whether the cutting fluid is sufficient and whether the circulation channel is unblocked.

 

6. Deformation of workpiece, clamping and breaking molybdenum wire: avoid cutting deformation of materials: reasonable heat treatment process of materials; Pre-machining threaded holes; Pre-cutting to release stress; Optimize cutting path

 

7. There are burrs or oxide scales on the surface of the workpiece, which leads to inexplicable wire breakage during machining: grind or polish the surface of the workpiece before WEDM.

 

8. There are non-conductive impurities in the workpiece material or non-conductive oxides on the surface of the workpiece: change the material; Non-conductive impurities before cutting

 

9. Poor quality and inappropriate concentration of wire cutting fluid: the machining fluid is too dirty if it is not replaced for a long time.