Manufacturing process of hot press formed aluminized steel parts
US11401577B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 2017 |
| Grant date | Aug 2, 2022 |
| Priority date | — |
| Expiry date | Mar 24, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27B9/36
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A manufacturing process of a press hardened coated part including providing a furnace containing N zones, each furnace zone being respectively heated at a setting temperature Θ1F, Θ2F, . . . ΘiF, . . . , ΘNF, including: providing a steel sheet with thickness th between 0.5 and 5 mm, the steel sheet covered by an aluminium alloy precoating with a thickness between 15 and 50 μm, the emissivity coefficient being equal to 0.15(1+α), α being between 0 and 2.4, then cutting the steel sheet to obtain a precoated steel blank, then placing the precoated steel blank in furnace zone 1 for a duration t1 between 5 and 600 s, wherein Θ1F and t1 are such that: Θ1Fmax>Θ1F>Θ1Fmin then transferring the precoated steel blank in the furnace zone 2 heated at a setting temperature Θ2F=Θ1B and maintaining isothermally the precoated steel blank for a duration t2, then transferring the precoated steel blank in further zones (3, . . . i, . . . , N) of the furnace, so to reach a maximum blank temperature ΘMB between 850° C. and 950° C., the average heating rate Va of the blank between Θ2F and ΘMB being between 5 and 500° C./s, then hot forming the heated steel blank so as to obtain a part, then cooling the p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.