Protrusion forming punch die

* High-grade powder metallurgy steel + TiAlN/CrN multilayer coating – resists adhesive wear and micro-chipping under high-stroke impact, ideal for alloy/stainless steels. * Precision-ground protrusion cavity – ensures exact raised height (±0.02 mm) and profile radius, eliminating secondary machining. * Optimized fillet and draft angles – reduces stress concentration at the protrusion base, preventing fatigue cracks during millions of cycles. * Mirror-polished forming face (Ra ? 0.06 µm) – guarantees smooth material flow, prevents sticking and galling on the raised surface. * Venting grooves designed for rapid ejection – eliminates vacuum effect, ensures clean part release at 200+ spm without distortion. * Superior toughness (HRC 56–60) – balances hardness and fracture resistance, withstands off-center loading and heavy impact. * Customizable protrusion shapes – adapts to round, oval, rectangular, or special patterned bumps for various fastener applications. * Proven on multi-station cold headers – stable performance, scrap rate <0.4% in long-run production of self-drilling and flange screws. * Optional DLC coating – extends punch life 2-3× when forming high-silicon or high-strength materials. * 100% dimensional and hardness inspection – each punch measured by CMM and Rockwell tester; fully interchangeable with standard punch holders.