How many important factors restrict the application of this technology to forming molds?

2021-03-23 16:39:21 admin

How many important factors restrict the application of this technology to forming molds?


In terms of automotive mold materials, ceramics are also used to make molds.




Chemical heat treatment of automobile molds often has much higher tensile resistance than conventional steel molds. In the absence of other surface treatment methods, this is not a better choice, and it is also a more commonly used method in my country. As far as the nitriding treatment is concerned, the nitrided compound layer has high tensile resistance, but due to its limited hardening effect (generally below HV1200) and the thinner compound layer (about ten microns), its wear resistance is limited. Once the compound layer is worn, strains will appear again, so the nitriding treatment often fails to meet the production requirements in the mass production process; in terms of the boronizing process, the hardness of the hardened layer can reach HV1800, and the wear resistance is high. However, according to the author's experience, the stability of boronizing quality, the greater deformation of boronized workpieces and the poorer tensile resistance of the boronized layer are several important factors that restrict the application of this technology to forming molds. The automobile mold vulcanization technology has high anti-friction performance, and has achieved good results in some occasions, but the effect is limited for the molding molds with heavier load.




Surface super hardening treatment refers to chemical vapor deposition (CVD), physical vapor deposition (PVD), physical chemical vapor deposition (PVD), TD coating treatment. The common feature of these surface treatments is that they can form a hardened layer above HV2000 on the surface of the workpiece, and have extremely high wear resistance and seizure resistance. Practice has proved that chemical vapor deposition (CVD), TD coating processing technology is the best method to solve the problem of workpiece strain, and physical vapor deposition (PVD), physical chemical vapor deposition (PCVD), although the surface hardness can also be Reaching HV2000—3000 or even higher, the hardened surface layer also has extremely high wear resistance and tensile resistance performance, but due to its film-base bonding strength is greater than that of CVD and TD coating treatments, it is often used during use. Early fall off does not give full play to the performance characteristics of the surface super hardened layer. Therefore, these two methods may have an effect under the condition of small load, but it is difficult for the general molding mold to have a satisfactory effect.