During the stamping process of stainless steel color plate, the surface color is easily affected, which involves complex factors such as material deformation, stress, and the relationship between the coating and the substrate. To explore the reasons and find solutions, it is necessary to analyze from the principle of stamping and the structural characteristics of the color plate.
Stamping is a process that uses a mold to apply pressure to the stainless steel color plate to make it plastically deformed to obtain a specific shape. In this process, the coating on the surface of the color plate is closely connected with the substrate and bears external forces together. When the mold squeezes the color plate, the substrate deforms first, and the coating needs to extend with the deformation of the substrate. However, there are differences in the material properties of the coating and the substrate, and the ductility and hardness of the two are not completely consistent. This inconsistency causes relative displacement and stress between the coating and the substrate during the stamping process. Once the stress exceeds the bearing limit of the coating, the coating may crack, peel off, etc., directly destroying the integrity of the surface color.
The surface state of the stamping die also has a significant impact on the surface color of the color plate. If the mold surface is not smooth enough, and there are tiny bumps, depressions or impurities, it will directly contact and cause friction with the surface coating of the color plate during stamping. This friction will cause physical damage to the coating. At the least, it will scratch the surface of the coating and make the color lose its luster. At the worst, it will directly scrape off the coating and expose the original color of the stainless steel substrate. Moreover, the rough mold surface may also leave indentations on the surface of the color plate. These indentations not only affect the appearance, but also may change the thickness and structure of the coating, further affecting the uniformity and stability of the color.
The selection of stamping process parameters is also crucial. Parameters such as the pressure, speed and temperature changes during the stamping process will affect the color of the color plate surface. Excessive pressure will cause excessive stress on the color plate substrate and coating, increasing the risk of cracking and peeling of the coating; too little pressure may lead to incomplete forming, requiring multiple stampings, which will also damage the coating. If the stamping speed is too fast, the coating cannot adapt to the deformation of the substrate in time, and it is easy to produce wrinkles and cracks; if the speed is too slow, it will extend the processing time and increase production costs. In addition, in some stamping processes, the friction between the mold and the color plate will generate heat. If the temperature is too high, the coating material may undergo chemical changes, resulting in color fading and discoloration.
Different types of stainless steel color plate coatings also perform differently during the stamping process. For example, the coating material of organic-coated stainless steel color plate is usually various resins. This type of coating has a certain degree of flexibility, but relatively poor heat resistance and wear resistance. During the stamping process, the organic coating is more likely to be damaged by friction, stress and temperature changes, resulting in color shedding, discoloration and other problems. Although the inorganic coating has higher hardness and better wear resistance, it is not flexible enough. When the substrate undergoes a large deformation, the coating is prone to cracks, which also affects the surface color. Therefore, different stamping processes and parameters are required for different types of coatings to reduce the impact on the surface color.
In order to reduce the impact of stamping on the surface color of stainless steel color plate, manufacturers have taken a variety of improvement measures in the process. On the one hand, the stamping die is optimized, and high-precision processing technology is adopted to ensure that the die surface is smooth and flat. The die is regularly maintained and cleaned to prevent impurities from adhering. On the other hand, through experiments and simulations, the stamping process parameters are accurately adjusted to find the best combination of pressure, speed and temperature, so that the coating and the substrate can coordinate deformation during the forming process of the color plate and reduce stress concentration. In addition, the color plate can be pre-treated before stamping, such as appropriately softening the coating to improve its flexibility so that it can better adapt to the deformation of the substrate.
In addition to process improvements, the development of new stainless steel color plate coating materials is also key. New coating materials need to have better flexibility, wear resistance and heat resistance, and can be closely combined with the substrate during the stamping process to jointly withstand external forces without damage. For example, some companies have developed nano-composite coatings that improve the hardness and wear resistance of the coating by adding nano-scale particles to the coating, while maintaining good flexibility. After stamping, the surface color can still remain intact and beautiful.
The impact of the stamping process of stainless steel color plate on the surface color involves many aspects, from molds, process parameters to the coating material itself. Any problem in any link may cause color damage. By optimizing mold design, adjusting process parameters and developing new coating materials, the negative impact of stamping on surface color can be effectively reduced, so that the stainless steel color plate can obtain the ideal shape while still maintaining a beautiful appearance and lasting color.
