During the metal stamping process, stamping dies will be damaged to varying degrees. Once this occurs, it will have an impact on production costs and benefits. So, what kind of damage can molds suffer? This article will focus on discussing this topic.
Strain
The main cause of the scratch problem is the local adhesion on the surface of the workpiece and the mold. Research shows that if no targeted protective measures are taken for the mold surface, it will seriously affect the flow of sheet metal during the forming process. No matter how the mold is heat-treated or how high the hardness is after quenching, scratches will occur.
Once a strain occurs, it often brings about the following problems simultaneously:
(1)Once a strain problem occurs, it will be quite difficult to meet the requirements of mass production. This not only affects production efficiency but also increases the workload of the staff.
(2) The service life of Long low molds is long, and the dimensions of processed parts lack consistency.
(3) It affects the quality and aesthetics of the manufactured parts
Wrinkling
The force conditions of parts during the drawing forming process are relatively complex. Since the thickness of the sheet metal is much smaller compared to its length and width, it is very likely to affect stability under tensile and compressive stress, and even wrinkling may occur.
(1) Characteristics of compressive stress wrinkling. In most cases, the straightness of the die opening direction mainly occurs at the corner of the die opening. Due to the shrinkage deformation, the character in the sheet metal is subjected to compressive stress in the direction parallel to the return Angle of the die. When the compressive stress exceeds the limit that the sheet metal can withstand, it will affect the stability. In addition, in most cases, uneven tensile stress wrinkling occurs at the gentle positions of the outer plate. Since it is all subjected to tensile stress, the probability of wrinkling is reduced.
[2) Characteristics of shear stress wrinkling. This is caused by uneven force application at the wrinkling position, resulting in different flow rates of the metal bars around, which eventually increases the probability of wrinkling.
Cracking
During the production of stamping parts, the main reason for the scrapping of the parts is cracking. The occurrence of cracking is mainly due to the fracture failure and plastic deformation failure during the forming process of the parts. At the same time, it is also very likely to be affected by factors such as design, material technology, and the wear of the die itself. During the normal use of the die, the phenomenon of loss of efficiency often occurs. In addition, it is necessary to strictly classify the types of wear according to the mechanism of wear, and then adopt targeted techniques for treatment.
The part is dented.
In the production process after stamping, the strength and surface finish of the insert often cause many troubles for stamping production. Insufficient strength of the insert is very likely to cause chipping during production, thereby resulting in burrs on the workpiece. Insufficient smoothness of the insert will also make it more likely for the workpiece to be scratched and for material chips to adhere to the surface of the insert, thereby causing frequent damage to the workpiece. The problem of external plate parts being dented has always been a headache for engineers in the production of stamping parts, seriously restricting the achievement of indicators such as the return rate and downtime rate. At the same time, insufficient surface finish of the inserts can also lead to the occurrence of rough parts.
After understanding all the factors that affect molds, how can we avoid damage to molds during the processing? In the next article, we will focus on discussing how to avoid damage and improve production efficiency.
