1. Optimize Stamping Die Design

Rational die design is fundamental to improving durability. Effective measures must be adopted to address adverse product forming conditions during the design phase.

For small-hole stamping dies (where service life depends primarily on the small-hole punch), minimize the length of slender punches to enhance strength and use guide sleeves for protection.

Critical design considerations include: die set type, punch/die fixing and guiding mechanisms, pressure center alignment, and rigidity of upper/lower templates.

For blanking dies, clearance selection is crucial. Excessively small clearance reduces service life. Appropriately increasing clearance (without compromising stamping part quality) can significantly improve durability, sometimes by several to dozens of times.

2. Select Appropriate Die Materials

Material properties (strength, toughness, wear resistance) directly impact die durability; high-grade materials can improve durability several times under specific conditions.

Toolox series (a new pre-hardened tool steel) offers high toughness, wear resistance, minimal internal stress, high purity, fine grain size, low S/P content, and uniform carbide distribution. It exhibits excellent surface treatment performance: Toolox44 reaches HRC65+ after nitriding, Toolox40 HRC62+, and Toolox33 HRC58+, with a maximum effective depth of 1.8mm.

Toolox series is particularly suitable for: 1) Stamping dies for thick steel plates (typical 35mm), stainless steel, non-ferrous metals (e.g., air conditioner fin dies); 2) Drawing dies (including stainless steel drawing dies); 3) Cold extrusion dies (replacing DC53 for cold extrusion of 0.5mm+ 304 stainless steel with excellent results); 4) Large stamping templates requiring high dimensional stability.

3. Rational Forging and Heat Treatment of Die Components

Proper forging and heat treatment of die materials (even for the same material grade) are key to improving durability. Overheating during quenching increases brittleness, and causes deformation/cracking during cooling, reducing durability. Strict control of heat treatment processes is mandatory.

Toolox materials are pre-hardened quenched and tempered steel supplied directly by the steel mill, eliminating the need for additional heat treatment. Combined with appropriate surface treatment (e.g., nitriding), the high toughness of the Toolox substrate and high hardness of the surface layer achieve excellent performance.

4. Rational Manufacturing Processes and Precision Assurance

Die machining accuracy significantly affects durability. Uneven assembly clearance in blanking dies often causes die damage; low surface finish also reduces durability.

Critical precision requirements include: hole pitch accuracy, perpendicularity of punches to the fixing plate support surface during assembly, uniform die spacing, and guiding accuracy of guide bushes/columns. Higher manufacturing/assembly precision and surface finish grade directly improve durability.