Punching metal with precision

Different metals have different properties that affect how they are punched. Here is a guide on how to handle each metal: 

Mild steel (structural steel) 

• Clearance: 15-20 % of the material thickness. 

• Tool selection: High-speed steel is often enough. 

• Speed: Standard machine speed works well. 

• Lubrication: Normal stamping oil to reduce friction. 

Hardenable steel 

• Clearance: 15-20 %, but the wear on tools is higher. 

• Tool selection: Powder metal steels or coated punches (PVD/CVD). 

• Lubrication: Important to avoid high heat. 

• Tips: If hardened, laser cutting may be a better option. 

Stainless steel 

• High wear and tear: Tougher and harder than carbon steel. 

• Clearance: 20-25 % of the plate thickness. 

• Speed: Go slower and apply powerful pressure. 

• Tool selection: High-speed steel with TiN coating to reduce sticking. 

• Lubrication: Good coolants/lubricants are essential. 

High-strength steel 

• Clearance: 20 % or more. 

• Tool selection: Powder metal steel or high-speed steel with hard coating. 

• Tips: Avoid punching too fast as it increases the risk of cracks. 

Copper 

• Soft and chewy: Tends to get stuck on the tools. 

• Clearance: 10-15 % of the thickness. 

• Lubricants: Reduces the risk of sticking. 

• Tips: Be careful not to get burrs or "roll-up" at the cutting edge. 

Brass 

• Similar to copper, but stiffer. 

• Clearance: 10-15 % of the thickness. 

• Speed: Regular punching speed works well. 

• Tips: Keep tools clean to avoid scratches. 

Aluminum 

• Very soft and can stick to tools. 

• Clearance: 10-15 % of the thickness. 

• Tool selection: Coated tools can prevent build-up. 

• Lubrication: Important to reduce the risk of adhesion. 

• Speed: Adapt according to the tendency of the material to stick. 

Contact us for a tailor-made solution 

Metal stamping requires precision, the right tools and a deep understanding of the properties of materials. At Thor Ahlgren we have the experience and expertise to deliver high-quality stamped components - whether for small batches or volume production. 

Do you need help with metal stamping? We do all this and more! Contact us today for a tailored solution and a free consultation.