Ultra-hardening treatment technology for the surface of stainless steel precision stamping molds 'hardware'

Stainless steel precision stamping welded pipe die material is generally made of high-carbon and high-chromium Cr12MoV (or SRD11, D2, DC53). The following process flow is generally used to make molds: blanking; rough machining; heat treatment (high temperature quenching and high temperature tempering); finishing; nitriding; finished products (Note: To save costs, general manufacturers now omit forging and spheroidization Two annealing steps are time-consuming and expensive). Since Cr12MoV materials are high-carbon and high-chromium alloy steels, there is a large segregation of components in the original structure (this segregation cannot be removed even by general forging). In this way, the internal structure of the mold after heat treatment (high quenching and high recovery) is extremely uneven, and the macroscopic appearance is extremely uneven (HRC about 40 to 60). After nitriding treatment, the uneven surface of the mold cannot be removed, and the matrix The hardness is further reduced. In actual use, the surface of the mold and the welded pipe are easy to be strained, and the mold life is low. Stainless steel precision stamping parts molds must have extremely high wear resistance and anti-bonding (seizure) performance. The stainless steel welded pipe is formed by rolling a stainless steel plate through a number of molds on a welded pipe forming machine and then welded. Due to the high strength of stainless steel and its structure is a face-centered cubic lattice, it is easy to form work hardening, so that when the welded pipe is formed: on the one hand, the mold has to withstand greater friction, which makes the mold easy to wear; on the other hand, the stainless steel sheet It is easy to form adhesion (occlusion) with the surface of the mold, causing strain on the welded pipe and the surface of the mold. Our analysis of imported welded pipe molds shows that the surface treatment of this type of mold is treated with superhard metal carbide or nitride coating. Stainless steel precision stamping parts. Compared with nitriding molds, the mold processed by this process can fundamentally solve the fuzz of the welded pipe, thereby reducing the workload of the subsequent polishing process of the welded pipe and improving the product quality (the pipe wall is reduced due to a large amount of polishing), which greatly improves The service life of the mold reduces the workload of after-sales service. The surface super hardening treatment technology of stainless steel precision stamping parts molds has been widely used in actual production. The service life of molds processed by this process is greatly improved compared with traditional processes such as nitriding, and the performance of some molds exceeds foreign standards. , And the price is only 1/4~1/10 of the foreign equivalent. The molds processed by this process include rolls, punches, color tube series cold work molds, standard parts molds, pyrophyllite molds, copper-aluminum profile extrusion molds, etc., which have produced high benefits for customers and made the mold cost-effective. Quality improvement