Measures to Improve the Life of Sheet Metal Stamping Dies

Through the analysis of the influencing factors of the Sheet Metal Stamping Dies life, it can be seen that there are many factors that affect the die life. These factors should be comprehensively considered when designing the mold, so as to design a more economical and efficient mold. For special-purpose cold stamping dies, should Combine its own requirements to design economical and applicable molds.

2.1. The correct choice of mold material

The working condition of the punch is worse than that of the female mold, and the material of the punch is better than that of the female mold. When blanking in large quantities, it is necessary to pay attention to the selection of mold materials that have high strength, good wear resistance, and good toughness.

2.2. A reasonable Sheet Metal Stamping Dies design structure is an essential prerequisite to ensure the service life of the die

The service life of Sheet Metal Stamping Dies has a great relationship with reasonable structural design. At the beginning of the design, other design requirements of cold stamping dies are guaranteed. The toughness, rigidity and strength of the die must be guaranteed to ensure that the convex, concave and other structural parts of the die during the blanking process of the cold stamping die will not be deformed, damaged or increased wear due to the impact of the blanking force. The mold design should use guided mold design as much as possible, and the mold design gap should also be considered. If the design gap is too small or too large, it will increase the degree of wear of the convex and concave molds, which will lead to mold damage and reduced service life.

2.3. Use and maintain molds reasonably

In the stamping process, the cold heading blank should be phosphated or copper-plated in order to reduce the friction resistance during work and prevent the adhesion of the mold. Therefore, the metal plate must be preheated to improve the processing performance of the material before cold heading. Reduce the possibility of cracks and extend the life of the mold. Lubrication during cold heading is also a good method. Good lubrication can obviously increase the surface finish of the metal sheet, reduce friction resistance, reduce wear, and extend the service life of the mold. When cold heading parts with complex shapes, lubrication becomes even better. Is important.

When the mold is stored, a certain gap should be maintained between the upper and lower molds to protect the cutting edge from damage. When punching, the depth of the punch into the concave mold should be controlled well to avoid aggravated wear. In the stamping practice, after punching and stamping for a period of time, the edge of the concave and convex die will be worn and worn out. If the mold is repaired at this time, it will not only reduce the frictional resistance and prevent cracks caused by wear groove marks, but also avoid the additional bending moment caused by the uneven gap between the die and the punch after the wear, and extend the use of the mold. life. After the cutting edges of the concave and convex molds are ground again, the gap between the cutting edges will be more uneven. At this time, the cutting edge should be carefully ground and polished with fine oil stone to remove the grinding burrs. Generally speaking, the surface roughness value should reach Ra≤0.10μm, so as to eliminate the hidden danger of edge wear of the concave and convex die immediately.

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