Method for creating a vacuum setup for producing a fiber composite part, and plunger used in the method
A method for creating a vacuum setup for processing a semi-finished fiber composite into a cured fiber composite component is provided. The semi-finished fiber composite is positioned on a molding surface of a tool so that a non-planar surface of the semi-finished fiber composite faces away from the molding surface, covering the non-planar surface of the semi-finished fiber composite by applying an air-tight film and sealing the film with respect to the molding surface of the tool. Application of the film is performed using a plunger formed from a flexible material and having a plunger surface on which the film is retained.
1. A method for creating a vacuum setup and processing a semi-finished fiber composite into a cured fiber composite component having a non-planar surface, the method comprising the steps:
positioning the semi-finished fiber composite on a molding surface of a tool so that the non-planar surface of the semi-finished fiber composite faces away from the molding surface;
releasable applying an air-tight film to a plunger surface; and
covering the non-planar surface of the semi-finished fiber composite by applying the film via the plunger and sealing the film with respect to the molding surface of the tool; and
releasing the film from the plunger so that the film is retained on the molding surface and retracting the plunger prior to the processing of the semi-finished fiber composite into the cured fiber composite component.
2. The method according to claim 1 , wherein the semi-finished fiber composite is processed, the non-planar surface of which is generally curved and has local indentations or embossments.
3. The method according to claim 1 , wherein the semi-finished fiber composite is processed and the semi-finished fiber composite includes at least one shell-shaped component and at least one reinforcement profile component.
4. The method according to claim 1 , wherein the plunger surface has a shape adapted to the non-planar surface of the semi-finished fiber composite.
5. The method according to claim 4 , wherein the plunger is provided with a mechanism that deforms the film retained thereon in adaptation to the shape of the plunger surface and the deformation is performed prior to or during covering the non-planar surface of the semi-finished fiber composite.
6. The method according to claim 5 , wherein the deformation of the film is achieved by an elongation plastically deforming the film material.
7. The method according to claim 6 , wherein an irreversible elongation of the film is, in at least in certain regions, at least 10%.
8. The method according to claim 7 , wherein the irreversible elongation of the film is, in at least in certain regions, at least 50%.
9. The method according to claim 5 , wherein the mechanism for deforming the film comprises at least one vacuum passage opening out on the plunger surface, and deforming the film is achieved by applying low-pressure to the vacuum passage.
10. The method according to claim 1 , wherein the plunger surface has a corrugated shape that is a mirror image of a corrugated shape of the non-planar surface of the semi-finished fiber composite and the releasably applying of the film to the plunger surface involves deforming the film into the corrugations of the plunger surface.
11. The method according to claim 10 , wherein the deforming of the film into the corrugations of the plunger surface occurs before the plunger is advanced towards the semi-finished fiber composite.
12. The method according to claim 1 , wherein the film is deformed into a shape corresponding to the non-planar surface of the semi-finished fiber composite prior to the plunger resting against the non-planar surface of the semi-finished fiber composite.
13. The method according to claim 1 , wherein the film is retained on the molding surface by application of low-pressure by the vacuum setup.