P 1222 – Hot cutting of carbon martensitic chrome steels in multistage processes
The use of hot cutting for the production of structural components from carbon-martensitic chromium steels in the automotive industry offers economic advantages over the currently predominant laser cutting. For example, the elimination of downstream laser trimming leads to a significant reduction in process time and contributes to an increase in productivity. With hot cutting, no material deposits occur as a result of spatter on the surface, and there is potential for savings in tool costs because cooling channels close to the surface, as required in the processing of 22MnB5 quenched and tempered steel, are not necessary. At present, chromium steels are hardly used in the manufacture of body components. One reason for this is the lack of experience with regard to the process parameters for hot cutting.
Within the scope of this research project, the influence of the process parameters on the cut surface geometry, the dimensional stability and the expansion capacity was therefore scientifically investigated. The focus was on the change in the individual cut surface parameters as a result of different parameter combinations. In addition, fundamental knowledge was gained about the effect of upstream and downstream forming operations on the quality and static properties of the cut parts.
The research result is the provision of optimum process parameters and thus an increase in the operational readiness of hot cutting processes for the production of shape-hardened components made of chromium steel.
Prof. Dr.-Ing. B.-A. Behrens