| 摘要 |
The method comprises providing a plate made of curable steel sheet material (10) with a corrosion protection coating (12) applied on single side, forming the plate to a sheet metal part, carrying out a press hardening process in order to induce hardening the steel sheet material, where a temporary oxide layer (13) forms on the corrosion protection coating during the hardening process, and partially removing the oxide layer from the sheet metal part using cleaning jets (22) with an abrasive blasting material and/or by mechanical cleaning. The method comprises providing a plate made of curable steel sheet material (10) with a corrosion protection coating (12) applied on single side, forming the plate to a sheet metal part, carrying out a press hardening process in order to induce hardening the steel sheet material, where a temporary oxide layer (13) forms on the corrosion protection coating during the hardening process, and partially removing the oxide layer from the sheet metal part using cleaning jets (22) with an abrasive blasting material and/or by mechanical cleaning. The removal of the temporary oxide layer is carried out by pressure-cleaning jets or slingshot cleaning jet. The process parameter such as beam pressure is adjusted so that an interference of the corrosion protection coating and/or the dimensional accuracy of the sheet metal part are barred. Angular steel granulates are used as abrasive beam material. The sheet metal part is simultaneously exposed from both sides of a cleaning beam with abrasive beam materials. The removal of the oxide layer is automatically carried out. The steel sheet material is 22MnB5-steel material or is based on steel material. The corrosion protection coating consists of zinc and has a layer thickness of 400 g/m 2>. The mechanical cleaning is carried out by brushes and/or cleaning loop. The quality of the corrosion protective coating cleaned from oxide layer is detected. The quantitative detection of the quality is carried out through an electric resistance measurement. An independent claim is included for a method for removing a temporary protective layer from a sheet metal part. |
