Many punch manufacturers choose Wire EDM, their reason is simple – wiring is easy and cheap and internal radii are eliminated by making tiny undercuts written into the cutting program. however, there are also manufacturers choose to grind highly precision carbide punch by grinding lathe. We need to understand the advantages and risks of both types.
Risks with WEDM
The finish on wired carbide has surface micro fractures, which is workable for a full sized punch but it’s bad news for small, highly stressed areas of a small punch working at up to 800 strokes a minute. Breakages are unpredictable but not surprising.
Grinding Advantages
Grinding gives a surface finish entirely free from any micro fracture defects. With this level of support our die makers can concentrate on what they do best – producing high quality stamping parts.
