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If the stamping / forming die surface fails, it usually appears as wear, corrosion, cracking and deformation. In order to effectively prevent the service life of the mold to be shortened, the surface of the relative motion parts and the medium size cavity should meet the requirements when the die is treated. It must have high lubrication and hardness so that it can better reduce wear, improve wear resistance, and achieve better fatigue resistance. The application of PVD coating technology can effectively solve the above problems.
After the application of low temperature ion carburization, unbalanced magnetron sputtering Ti/TiN and PVDTi/TiN to the surface of Cr12MoV cold working die steel, the wear resistance and load capacity of the die have been effectively strengthened because of the effect of PVD Ti/TiN coating, and the surface of the die is treated by the treatment of the ion carburizing. Through PVD Ti/TiN conforming processing, it is better to achieve effective reinforcement of its performance. In the process of compound treatment, the first application of the ion carburizing to the middle thin layer is carried out, which makes the Ti/TiN better support, thus better to improve the life of the cold working die. This technique fully shows that when the mold with relatively poor surface hardness is treated, the ion carburizing process can be applied first, and then the corresponding PVD coating can be processed. Through this comprehensive intervention method, the effective improvement of the service life of the coating can be achieved.
In the process of making ASSAB 635 cold working die steel, the researchers used PECVD DLC coating treatment technology and PVD CrTiN coating treatment technology respectively, and then based on this treatment, the imprinting test of chromium plating process was carried out on the die. According to the surface, the surface of the silver coin printed by the CRTiN coating die is close to the surface quality of the chromium plating, but when the DLC coating is treated, the surface of the silver coin shows a very obvious blackening phenomenon, mainly because the coating is transferred to the surface of the silver coin, but this is the result. It is also fully proved that the toughness of DLC coating is relatively poor and the hardness is relatively high. After the printing of silver coins, the role of the chromium plating die is therefore invalidation; after the printing of 1000 silver coins, the CRTiN coating still shows a better characteristic, and there is no phenomenon of any coating spalling. Compared with the chromium plating mould, the life of the coating can be improved to 2 times. And above. In addition, a layer of TiN was plated on the surface by ion plating on the surface of the silver coin, and it was proved by experimental comparison that the life of the die after this technique was 3 times higher than that of the uncoated mould.
Because the friction coefficient of DLC coating is very low, and has good lubrication performance, and has better wear resistance, higher hardness and better corrosion resistance, so it is widely used for various composite tube molding die, and its service life has been increased by more than 3 times. In addition, the life span of the semiconductor packaging die has been improved by nearly 10 times, and the life span of the disc die can be improved by 4 million times. By the effective use of the air conditioner over the punch, the life span can be raised at least 3 times, and the number of punching. It can also be raised by at least 8 million times. The results of the two methods of N composite coating prepared by TiN and multi arc ion coating method were compared. The results showed that the hardness of the forming punch of the battery shell was obviously higher, and the wear resistance of the latter was equal to that of ZrN. Furthermore, through the study of the life of the convex film, the N composite coating prepared by the multi arc ion plating method has a life span of at least 4 times higher than that of the convex film without the coating treatment.
In the coating treatment of the blanking and stamping die, a new oblique impact sliding test was adopted by the researchers. Through this experiment, the cycle impact and the sliding force synthesis state of the stamping die materials were simulated. The TiN coating die showed obvious wear. During the analysis of the finite element software for high strength steel, the simulation treatment of PVD coating was achieved through the antiwear and antifriction angle. The influence of Graphit-iC type graphite coating, MoST and CrMoN on the cold working die steel life to the coating was weakened. The application of the die can reduce the equivalent stress of the die to varying degrees, and thus better enhance the life of the high strength steel punching die.
Fine blanking is a kind of precision plastic forming process with high quality, high efficiency and high added value. It can be said that high quality parts can be obtained by one punching, and the precision stamping dies fail. At the same time, the following form, including die fracture, excessive wear loss and plastic deformation. TiAIN and TiN coatings have been widely used in fine blanking industry due to their high corrosion resistance, thermal stability and good wear resistance.
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