Custom Stainless Steel Kitchen Plates And Serving Bowls, Stretching And Stamping Dies

I. Mechanism Analysis of Surface Scratching and Wrinkling Defects in Stamping Dies
Surface scratches in stamped parts manifest as surface scratches and material peeling, primarily caused by excessive frictional resistance between the sheet metal and the die surface. Wrinkling defects originate from uneven local plastic deformation during the sheet metal forming stage, leading to unstable material accumulation and the formation of wavy wrinkles. Both types of defects impair the workpiece's appearance accuracy and reduce its structural mechanical properties, hindering subsequent assembly and secondary processing.

II. Control and Improvement Measures for Scratching Defects

Optimize Die Surface Modification Processes
Improve the machining accuracy and surface flatness of the die surface by employing surface strengthening processes such as chrome plating, gas nitriding, and hard coating to reduce the interfacial friction coefficient.
Set reasonable surface roughness indicators to match the forming conditions, balancing lubrication retention capacity and surface engagement resistance to suppress scratching from the die end.

Standardize the Selection of Stamping Lubricating Media
Select dedicated lubricating media adapted to the sheet metal material and forming process to isolate the sheet metal from direct hard contact with the die and improve material flow characteristics. Based on the forming difficulty, sheet thickness, and operating conditions, standardize the lubricant type, application amount, and application method to ensure stable interface lubrication.

Quantitatively control stamping process parameters: Unify the setting of core parameters such as stamping load, forming speed, and process rhythm to maintain the continuity and stability of sheet plastic deformation and avoid problems such as increased local friction caused by overload impact and high-speed stamping. Rationally break down forming processes to disperse localized stress concentration and reduce friction-related defects.

Optimize mold structure design based on simulation: Use finite element forming simulation technology to quantitatively analyze the stress distribution and material flow law during the forming process, and predict material accumulation and instability areas. Optimize the mold surface structure, accurately design the edge pressing structure and pressure distribution logic, constrain the material flow rate and forming range, and avoid localized accumulation and wrinkling.

Precise matching of process parameters and auxiliary tooling ensures stable control of key indicators such as blank holder force, drawing rate, and die working temperature, guaranteeing synchronous and uniform material flow in all areas. Auxiliary forming devices are configured according to production needs, adjusting the rheological properties of the sheet metal under operating conditions to improve the forming stress state and effectively suppress wrinkle defects.