Injection molding tool and method for producing molded parts

A device for producing a composite molded part (1) having a planar structure (2), in particular a planar decorative structure, enveloping at least a part of the composite molded part, in particular a part of the surface of the composite molded part, and an at least partially injected support structure (3), comprising a matrix (4) for receiving the planar structure (2) in a non-composite state, a punch (5) and a matrix slider (6), wherein punch (5), matrix (4), and matrix slider (6) are arranged so as to be movable relative to one another, such that in a closed state, they define a cavity (A) together, which essentially corresponds to the shape of the composite molded part (1) to be produced,

• wherein
• an edge folding arrangement having a first curved region (12, 13) defining the folded edge and having a second region (8, 9, 10, 15, 17, 20, 21), spaced at a distance from the first, which fixes and/or pinches off and/or completely severs the edge-folded border of the planar structure (2), is formed by at least one region and/or on at least one region of one of the components matrix slider (6), punch (5) and/or matrix (4),
• wherein
• the punch (5) has an element for fixing the planar structure that is movable in a direction parallel to the matrix slider (6) in the region of its side wall, which region is facing the matrix slider (6).

A method for producing a composite molded part (1) with a planar structure (2), preferably a decorative structure, enveloping at least a part of the surface of the composite molded part, and an at least partially injected support structure (3), comprising the steps of:

• a) providing a device with at least a punch (5), a matrix (4), and a matrix slider (6) in an open position;
• b1) inserting a not yet composite planar structure (2) into the device, such that the planar structure corresponds to at least a part of a contour of the composite molded part (1) to be obtained;
• b2) optionally using a planar structure (2) partially preformed with a folded edge;
• c) transferring the device into a closed position and creating a cavity (A) essentially determining the shape of the composite molded part (1) to be produced inside the device;
• d) inserting an uncured support structure (3) into the cavity;
• e) removing a strip (11) of the planar structure (2) protruding beyond the border of the folded outer edge on the rear side of the composite molded part (1);
• f) curing and subsequently
• g) demolding the composite molded part (1), wherein steps d) to f) may be performed in a different order and/or to some extent simultaneously;
• wherein
• during step c) of transferring the device in a closed position and during the creation of the cavity (A) inside the device essentially determining the shape of the composite molded part (1) to be produced, the outer border of the folded edge (2a) is fixed between two components moved in parallel with one another and is carried along with their closing movement, and prior to and/or while introducing the uncured support structure (3) in step d), the planar structure (2) is fixed in the region of the outer border of the folded edge (2a).