| 摘要 |
<p>The method comprises concentrating electromagnetic alternating field as inductive heating on an area of a sheet metal plate (24) of a flat metal gasket to be formed, and simultaneously and directly exposing all parts of the area of the plate along the electromagnetic alternating field. The sheet metal plate is made of spring steel sheet metal. The flat metal gasket is provided in the area to be formed with a supporting element produced by forming the plate. A pressing force acts on the supporting element during clamping the gasket between the machine component sealing surfaces. The method comprises concentrating electromagnetic alternating field as inductive heating on an area of a sheet metal plate (24) of a flat metal gasket to be formed, and simultaneously and directly exposing all parts of the area of the plate along the electromagnetic alternating field. The sheet metal plate is made of spring steel sheet metal. The flat metal gasket is provided in the area to be formed with a supporting element produced by forming the plate. A pressing force acts on the supporting element during clamping the gasket between the machine component sealing surfaces. In the area of the supporting element, the sheet metal plate has a larger total thickness than in the area of the plate limiting at the supporting element. The hardness of the plate is completely decreased in the area to be formed by inductive heating before forming. The impact time of the alternating field on each part of the area is 10 milliseconds to 1 second. The austenitic spring steel sheet metal is used as raw material for the plate with a yield strength R eof 1000 N/mm 2>. The area of the plate is heated at 700-900[deg] C. The frequency of the alternating field is 100 kHz to 1 MHz. The energy of the alternating field is 1kW. The area of the plate is cooled after its heating, so that the embrittlement of the steel impairing the formability of the sheet metal plate is prevented. The sheet metal plate is clamped for avoiding the formation of distortions when heating its area during heating between clamping surfaces. The sheet metal plate is under a tension during heating its area. The sheet metal plate has areas provided with a deformation in the direct vicinity of the supporting element. The inductive heating of the area of the plate provided with the supporting element is selected according to the impact time, concentration and the energy of the alternating field, so that no considerable recrystallization of the steel occurs and so that the steel experiences no considerable structural changes in the area of the sheet metal plate. Independent claims are included for: (1) a device for forming areas of a sheet metal plate of a flat metal gasket made from spring steel sheet metal; and (2) a spring steel-sheet metal plate for a flat metal gasket.</p> |
