Stamping is a crucial process in metalworking, but ensuring that stamped parts do not suffer from material burring or distortion is of utmost importance. In this article, we will explore effective methods to prevent these issues and maintain the quality of stamped components.
1. Material Compression
To enhance the traditional die design structure, consider creating material clearance on the stripper plate (the gap between the stripper plate and the die when closed should be the material thickness t-0.03 to 0.05mm). This design improvement ensures smooth movement of the stripper plate during stamping, allowing proper material compression. For critical forming areas, adopting a block-style structure for the stripper plate is essential to address wear and tear resulting from prolonged stamping, which can lead to the inability to compress materials. Using the stripper plate to compress the material prevents upward curling of the material on the die side.
2. Rationalize Material Removal Sequence
In progressive dies, the sequence of material removal can significantly affect the precision of stamped parts. When dealing with the removal of material from small sections of stamped components, it’s advisable to begin with larger, area-cut material removal and follow it with smaller, area-cut removal. This arrangement minimizes the impact of shearing forces on the formation of stamped parts.
3. Bevel or Round the Die Edge
Adding a bevel or arc to the die edge can effectively reduce shearing forces. Lowering shearing forces alleviates the tensile stress on the die side material, preventing material burring and distortion in metal stamping parts.
4. Maintain Sharpness of Die Cutting Edges
Regularly inspect and maintain the sharpness of die cutting edges. Any wear or damage to the cutting edges can increase the tensile stress on the material, leading to an increased risk of material burring and distortion in stamped parts. Proper maintenance is crucial to avoid such issues.
5. Introduce Enhanced Pressure
Increasing the thickness of the pressure block on the stripper plate (typically, the thickness should be H+0.03mm) is a viable strategy. This extra thickness adds more pressure on the die side material, effectively suppressing the occurrence of material burring, twisting, and deformation during the stamping process.
In conclusion, preventing material burring and distortion in stamped parts is critical in metalworking. These issues are primarily influenced by shearing forces and the rationality and uniformity of the clearance. By implementing the above methods, you can effectively address these challenges and ensure that stamped parts are free from material burring and distortion.