| With the rapid development of mold industry and increasingly high demands of themarket for mould, how to improve the service life of mould was particularly paidattention. Market competitiveness of products was increased by extending the service lifeof mould. The parts cost was reduced, also increasing the overall production efficiency.In this paper, to get failure mechanism of automobile Panel stamping mould and the keytechnologies of laser cladding re-manufacturing, the auto panel stamping mould was usedas the research object about the theoretical analysis and experimental methods.Firstly, according to the actual situation of automobile panel mould surface, thedamaged parts were analyzed after the failure analysis of research-related concepts. Theabrasion damage and wear of occlusion were the common failure mode on the surface ofautomobile panel mould, combined with the failure analysis theory. Further analysis wasinformed that unreasonable heat treatment would cause wear failure. The hardness mustbe greater than HRC55, which contains HRC55, to guarantee the life of mould byimproving heat treatment and surface hardening technology.Next, Cr12MoV, cold working mould steel was chosen to quenching and temperingabout heat treatment experiments. The aim was to determine the factors in Cr12MoVincluding the quench temperature, tempering temperature and the cooling method.According to the Rockwell hardness measured and observed microstructure, it wasindicated that the quench temperature of1000degrees centigrade and temperingtemperature below480degrees centigrade corresponded with the technologicalrequirements of materials.Focusing on laser surface cladding method was described in order to realize mouldre-manufacturing. Laser power and scan speed were main process parameters for lasercladding experiment. At the same time, comparing kinds of experimental materials wereself-fluxing powder based on iron and nickel, which were Fe313and Ni60B. Containingwhite-bright layer in both experimental materials explained that the hardness waspromoted, through observing microstructure. The process parameters for experimentalmaterials were got by Micro-hardness test as followed: Fe313, while the laser power was2000watts and the scanning speed was800millimeters per minute,870HV0.2of hardnesswas equal to HRC66.1. Also, as the laser power was2000watts and the scanning speedwas600millimeters per minute, the hardness of Ni60B obtained to946.1HV0.2,equaledHRC68. Meanwhile, achieving a combination of metallurgy was confirmed, in X-ray. Compared with heat treatment, the service life of mould was effectively extended by thelaser surface cladding method.Finally, inlaid-block structure was satisfied the technological requirements, throughthe analysis design features of repairing mould structure. The characteristic ofinlaid-block structure were quickly and easily replaced, applying in the sectional mould,the form in product and the integral punch. In addition, the standardization, theserialization as well as the generalization of mould design were presented, taking intoaccount the fixed mould of ease of use and easy maintenance requirements for improvingproduct competitiveness.In conclusion, it was useful to extend the service life of mould through choosingreasonable ways of heat treatment and the process parameters of cladding remanufacture. |
