EDM Spark machine tungsten steel reference ball

Electrospark machining is an important process method in mold manufacturing, especially in injection mold manufacturing. However, sometimes some misunderstandings in the process often lead to the electrospark machining of mold parts failing to meet the predetermined accuracy and efficiency requirements.

The precision control and guarantee of EDM depends largely on the positioning accuracy. In the commonly used Z-axis machining, the X and Y axes guarantee the position requirements of the cavity, and the Z axis guarantees the depth requirements of the machined cavity. There are many ways to achieve EDM positioning, including the positioning method that uses contact perception between the electrode and the workpiece.
This positioning method is relatively simple and is very familiar to operators. It can be found that if the precision requirements of EDM are very high, the positioning error requirement cannot be greater than 0.01㎜, such as the processing of the half slider of the plastic mold, the matching and insertion parts of the upper and lower mold cores, etc., it will be very difficult to use the above method in these cases, and it is difficult to ensure stable positioning accuracy. Due to positioning tolerance, parts are repeatedly repaired and scrapped. Operators often complain that the machine tool has poor perception performance or low positioning accuracy. In fact, the current EDM machine tool has a very high accuracy in displacement. The situation of inaccurate positioning is that there is a misunderstanding in the selection of positioning methods.
When the electrode and the workpiece are directly touched, the contact area is large, and the burrs on the electrode or the workpiece, the presence of fine debris, the flatness, parallelism, and verticality of the electrode and the workpiece affect the positioning accuracy. Even if the workpiece and the electrode are wiped clean, it is difficult to ensure a positioning accuracy of 0.01mm. For processing with irregular workpieces (electrodes) or electrodes that are too large (too small) and require very high precision, there is only an indirect positioning method, that is, indirect positioning using a centering ball. This positioning method uses point contact and can eliminate errors to the greatest extent.

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