Rapid Tooling Injection Mold Making EDM Sparking
No matter for injection mold, pressure die casting mold, compression mold, EDM sparking is one of the essential manufacturing processes. It’s making for machining the areas where CNC machining can not reach. For example, small ribs, radius corners, deep concaved bottom and etc.
Comparing with CNC machining, wire cutting, EDM sparking would be more expensive comparing with the other essential processes. It’s because that CNC machining and wire cutting is a direct process. While EDM sparking is an indirect process. Before sparking, we would have to CNC copper electrodes or carbon electrode in advance.
For rapid tooling and low volume production, we often suggest our customer to design the parts without EDM sparking, but with CNC machining as much as possible. For example, larger internal radius, less ribs if without effecting part strength, bigger ribs can be machined if possible, shallower concaved features and etc.
By the way, the sparking area sometime will be just left as what it’s sparked. It’s similar to texture surface and can be for cosmetic.
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