Method for manufacturing a fiber composite component with overlap joint or local reinforcement

Abstract

Method for producing a fiber composite component in an RTM tool (1) by introducing a matrix into a first and a second fiber semi-finished product (2, 3) which form a common fiber semi-finished product overlap area (4) with a total width B in which the first fiber semi-finished product (2) overlaps at least partially with the second fiber semi-finished product (3), wherein the RTM tool (1) has a mold cavity that forms a cavity in the RTM tool (1) and includes an overlap receiving section (8), a surface (5) of the mold cavity facing the cavity in the overlap receiving section (8) and / or directly adjacent to it a relief channel (6) opening towards the cavity and the surface (5) of the mold cavity facing the cavity in the overlap receiving section (8) forms a fixing means (7) extending into the cavity and wherein the procedure includes at least the following steps: a) Inserting the first fiber semi-finished product (2) into the cavity of the RTM tool (1); b) Inserting the second fiber semi-finished product (3) into the cavity of the RTM tool (1) so that the first fiber semi-finished product (2) forms the common fiber semi-finished product overlap area (4) with the second fiber semi-finished product (3) and this is positioned in the overlap receiving section (8); c) Fixing the first and / or the second fiber semi-finished product (2, 3) at least during injection of the matrix by the fixing means (7) of the RTM tool (1) extending over the total width B of the fiber semi-finished product overlap area (4), wherein the mold cavity forms gaps (10) between the fiber semi-finished products (2, 3) and the surface (5) of the mold cavity in the overlap receiving section (8); d) Injecting the matrix through a matrix injection channel (9) into the mold cavity, so that the matrix spreads in the first fiber semi-finished product (2) and / or the second fiber semi-finished product (3) and spreads in the overlap receiving section (8) and / or directly adjacent to it via the relief channel (6) over the total width B of the fiber semi-finished product overlap area (4).

Description

[0001] The invention relates to a method for producing a fiber composite component in an RTM tool by impregnating at least two fiber semi-finished products with a resin or a matrix, wherein the resin distribution is controlled by a relief channel and fixing elements.

[0002] Resin Transfer Molding (RTM), also known as resin injection molding, is a process for manufacturing long or continuous fiber-reinforced composite components in small, medium, and sometimes large production runs. This process allows for the production of hollow fiber-reinforced profiles, shell components, and flat composite components by impregnating a fiber preform through the injection of a matrix material, such as resin. For this purpose, the fiber preform, in a near-net-shape preform, is placed into a mold cavity, which is formed by a tool typically consisting of two parts. The resin is injected into the fiber preform or the mold cavity through channels in the RTM tool at a constant flow rate and pressure. During injection or impregnation, the resin flows through the fiber layers of the composite component and, after permeation, can exit through risers.The resin is then cured after the mold cavity is filled, if necessary under the influence of temperature and / or overpressure relative to ambient pressure. After curing, the fiber composite component can be removed from the mold.

[0003] If the fiber composite component to be produced has a complex shape due to large dimensions, numerous or extensive forming processes, or if it requires local reinforcement to optimize force flow, the overall shape of the fiber composite component can be assembled from several smaller preforms. Due to the manufacturing process, the preforms, which represent a specific section of the overall shape, are not always exactly identical in form. To compensate for oversize or undersize of the preforms at the connection points between two preforms, a tolerance is incorporated into the mold cavity at the transition points, allowing preforms with an oversize or undersize relative to their nominal dimensions to be accommodated.

[0004] Due to gaps that arise between the mold cavity and the preforms, caused by over- or under-dimension of the preforms, and which vary in size from preform to preform depending on the degree of over- or under-dimension, uncontrollable and non-reproducible "race tracking" occurs during the impregnation of the preforms or fiber semi-finished products. "Race tracking" refers to the resin or matrix advancing due to permeability differences within or on the fiber semi-finished products. The gap exhibits very high permeability, resulting in race tracking along its length. Because the size of the gap is undefined and varies from preform to preform, the race tracking is neither controllable nor reproducible.

[0005] “Race tracking” leads to an uneven spread of the resin in the preform and can result in uneven resin saturation of the fiber semi-finished product, an uneven distribution of the matrix in the fiber semi-finished product and air inclusions in the preform, which has negative effects on the quality and mechanical properties of the fiber composite component and negatively affects process reliability and process control.

[0006] Various embodiments of RTM tools are already known from the prior art. For example, DE 10 2007 013 987 A1 and US 4,740,346 each disclose methods or devices for manufacturing fiber composite components using the RTM process. However, none of these methods takes into account the production of a fiber composite component from multiple preforms. Therefore, they do not demonstrate a more reliable method for combining multiple preforms into a single fiber composite component shape. Further printed prior art in the present technical field is disclosed in documents DE 10 2012 216 727 A1, DE 10 2014 009 408 A1, DE 198 50 462 A1, DE 10 2013 016 858 A1, DE 10 2011 055 547 A1 and WO 2012 / 149 939 A1.

[0007] The invention is therefore based on the objective of overcoming the aforementioned disadvantages and providing a cost-effective, simple method using an RTM tool that enables a uniform, reproducible resin distribution in a transition area between two fiber semi-finished products.

[0008] This problem is solved by the combination of features according to claim 1.

[0009] According to the invention, a method for producing a fiber composite component is proposed, which is impregnated in an RTM tool by introducing or introducing a resin into a first and a second fiber semi-finished product or into the mold cavity. The first and the second fiber semi-finished product form a common fiber semi-finished product overlap area with a total width B, in which the first fiber semi-finished product at least partially overlaps with or is overlapped by the second fiber semi-finished product. The total width B of the fiber semi-finished product overlap area is the total width of the first and the second fiber semi-finished product in their fiber semi-finished product overlap area and is measurable along the end edges of the first and the second fiber semi-finished product in the overlap area from one side of a fiber semi-finished product to the side of a fiber semi-finished product that is furthest away along the end edges.The RTM tool has a mold cavity that forms a hollow space within the RTM tool and includes an overlap receiving section. A surface of the mold cavity facing the hollow space forms a relief channel opening into the hollow space and a fixing element extending into the hollow space. The relief channel and / or the fixing element are formed or arranged in the overlap receiving section. The method comprises at least the following steps: a) Inserting the first fiber semi-finished product into the cavity of the RTM tool. b) Inserting the second fiber semi-finished product into the cavity of the RTM tool, so that the first fiber semi-finished product forms the common fiber semi-finished product overlap area with the second fiber semi-finished product and this is positioned in the overlap receiving section. c) Fixing the first and / or second fiber semi-finished product (2, 3) at least during injection of the matrix by the fixing means (7) of the RTM tool (1) extending over the total width B of the fiber semi-finished product overlap area (4), wherein the mold cavity forms gaps (10) between the fiber semi-finished products (2, 3) and the surface (5) of the mold cavity in the overlap receiving section (8). d) Injecting the resin through a resin injection channel into the mold cavity, so that the resin spreads in the first fiber semi-finished product and / or the second fiber semi-finished product and spreads in the overlap receiving section and / or directly adjacent to it via the relief channel over the total width B of the fiber semi-finished product overlap area.

[0010] The fixative secures the first and second fiber preforms in the overlap receiving section, preventing them from moving during resin injection. Movement can occur, for example, due to the resin flow front, which displaces the fiber preforms. Such movement renders the resin flow and flow front uncontrollable and unreproducible across multiple RTM processes. To prevent the flow front from being determined by any of the gaps between the first and second fiber preforms and the mold cavity, the relief channel is positioned so that the resin flow front, propagating from the resin injection channel, encounters the relief channel before reaching any of the gaps between the first and second fiber preforms and the mold cavity.

[0011] The relief channel redirects the resin flow front and distributes it across the entire width B of the fiber preform overlap area, or across the width of the first and / or second fiber preform. Within the relief channel, "race tracking" occurs, but this is controllable and reproducible across multiple RTM processes due to the fixed, predetermined arrangement of the relief channel and its cross-sectional contour, which is adapted to the shape and material of the first and second fiber preforms. For redirecting the resin flow front, the relief channel is positioned directly adjacent to the overlap receiving section. Alternatively or additionally, the relief channel can also be positioned within the overlap receiving section, but in such a way that it does not overlap with the gaps between the first and second fiber preforms and the mold cavity.

[0012] The predetermined arrangement of the relief channel depends on the demolding direction of the respective area in which the relief channel is located. For example, the relief channel, such as in the fiber semi-finished product overlap section, is arranged in such a way that an undercut is avoided and demolding angles of at least 5° are provided during demolding, i.e., when the fiber composite component is removed from the mold cavity. This arrangement of the relief channel makes it easier to separate the fiber composite component from the mold cavity without damage.

[0013] According to the invention, a fixing step is carried out by which the first and / or the second fiber semi-finished product is fixed, at least during the injection of the resin. The fixing agent, which extends over the entire width B, uniformly fixes the first and / or the second fiber semi-finished product, thereby uniformly inhibiting or preventing movement of the first and / or the second fiber semi-finished product over the entire width B.

[0014] A projection extending into the cavity and along the relief channel is particularly advantageous as a fixing element. This projection, or fixing element, distributes the force evenly across the entire width B of the fiber preform overlap area, thus preventing the movement of the first or second fiber preform relative to the mold cavity, at least during resin injection, and advantageously from the insertion of the first or second fiber preform into the mold cavity until its removal. The projection presses the first or second mold cavity against the adjacent surface of the mold cavity on one side, or, via the other fiber preform, against the adjacent surface of the mold cavity. By embedding the projection into the first or second mold cavity, the pressure is reduced.The second fiber semi-finished product is impeded from moving along the surface of the mold cavity where it rests. The pressure against the surface opposite the projection, and the surface forming the projection itself, inhibits movement of the fiber semi-finished product (towards or away from either surface). The projection can have a trapezoidal or at least partially circular cross-section to provide a holding surface and / or holding force tailored to the first or second fiber material. The fixing element, or projection, is formed directly from the surface or, alternatively, attached to it via suitable fasteners such as screws.

[0015] Furthermore, it is advantageous to fix the first and / or second fiber semi-finished product, at least during resin injection, by means of a fixing agent formed by a multitude of projections extending into the cavity. Due to the multitude of projections, which are arranged at regular intervals along the relief channel, the resin flow can continue unimpeded between each pair of projections and is less restricted by the projections than by a continuous projection. The individual projections of the multitude are arranged at regular intervals and extend over the total width B of the fiber semi-finished product overlap area or the total width of the first and / or second fiber semi-finished product.The individual projections of the multitude of projections have a round, oval, or square cross-sectional area in a section plane parallel to the surface from which they are formed or to which they are arranged via suitable fasteners, such as screws or press fits. In a section plane orthogonal to the surface, a projection of the multitude of projections is trapezoidal, rectangular, or at least partially circular.

[0016] A particular advantage is that, at least during injection, the first fiber preform is fixed by the fixing agent, and the second fiber preform is fixed by a further fixing agent located on the opposite surface. The fixing agent, which is designed as a projection or a multitude of projections, penetrates the first fiber preform and fixes its movement along the surface formed by the fixing agent. The further fixing agent, by penetrating the second fiber preform, fixes it along the surface formed by the further fixing agent. The first fiber preform is pressed by the fixing agent against the second fiber preform, which is pressed against the surface of the mold cavity opposite the fixing agent or against the further fixing agent, thus completely restricting any movement of the first fiber preform within the area of ​​the fixing agents.The same applies to the second fiber semi-finished product, which is pressed by the further fixing agent against the first fiber semi-finished product and against the surface opposite the further fixing agent or against the opposite fixing agent.

[0017] An advantage of this method is the ability to control the resin's propagation speed and quantity during injection by adjusting the height and / or width of the relief channel. The height and / or width of the relief channel are greater in a first section than in a second section, which is spaced apart from the first section in the direction of resin propagation. The shape, design, and dimensions of the relief channel control the pressure, speed, and quantity of resin that penetrates and spreads within the first and / or second fiber semi-finished product. Controlling the resin flow...The resin flow can be directed precisely by the speed and direction of spread, the shape, the course and the dimensions of the relief channels and the fixing agents, so that the resin is distributed evenly in the first or second fiber semi-finished product and there are no dry spots, air inclusions or expansion of the fiber semi-finished products.

[0018] Furthermore, an insertion is advantageous in which the fiber semi-finished product overlap area of ​​the first with the second fiber semi-finished product is arranged in the overlap receiving section, which is formed by a first tool half and a second tool half of the RTM tool, which together form at least a part of the mold cavity.

[0019] A particular advantage of the clamping process is that the surface on which the clamping element is formed or arranged is comprised of the first mold half, the second mold half, and / or a fiber composite core located within the cavity of the RTM mold. The first and second mold halves, together with the optional fiber composite core, which forms a cavity in the finished fiber composite component, constitute the mold cavity. The clamping element, or multiple clamping elements, are arranged on one of the surfaces of the mold cavity.

[0020] For injection molding, it is advantageous that the surface on which the relief channel is formed is distributed across the first tool half, the second tool half, and / or a fiber composite component core of the RTM tool located within the cavity. The resin can be distributed through the relief channel or a multitude of relief channels across the entire width B and the entire surface of the fiber composite component.

[0021] The arrangement of the relief channel or the multitude of relief channels on the first and second tool halves and on the optionally available fiber composite component core enables targeted control of the resin or the spreading speed and direction of the resin.

[0022] The propagation speed and direction of the resin can be controlled in particular by the fixing agents and the relief channels, by guiding and redirecting the resin on its flow path by the different permeabilities of the fixing agent and the relief channel in comparison to the permeability of the first and / or second fiber semi-finished product.

[0023] Furthermore, it is advantageous that the respective thickness of the first and second fiber semi-finished products in the fiber semi-finished product overlap area is reduced from an original thickness to a final thickness in a thickness direction orthogonal to a respective surface facing the RTM tool, wherein the transition of the thickness from the original thickness to the final thickness is abrupt and / or gradual, and wherein the final thickness is smaller than the original thickness.

[0024] The features disclosed above can be combined in any way as far as is technically possible and provided they do not contradict each other.

[0025] Other advantageous embodiments of the invention are characterized in the dependent claims or are described in more detail below together with the description of the preferred embodiment of the invention with reference to the figures. The figures show: Fig. 1 a schematic sectional view through an overlap recording section of an RTM tool; Fig. 2 a schematic sectional view through an overlap recording section of an RTM tool; Fig. 3 a schematic sectional view through an overlap recording section of an RTM tool; Fig. 4 A schematic top view of a fiber composite component consisting of three fiber composite component segments with two fiber semi-finished product overlap areas.

[0026] The figures are schematic examples. Identical reference symbols in the figures indicate identical functional and / or structural features.

[0027] Fig. Figure 1 shows a schematic sectional view through an overlap receiving section 8 of an RTM tool 1. The RTM tool 1 is formed by the first tool half 1' and the second tool half 1" which form the mold cavity between them. The mold cavity serves as the negative form of the fiber composite component to be produced, which is composed of the first fiber semi-finished product 2 and the second fiber semi-finished product 3. Since the trimming of the first fiber semi-finished product 2 and / or the second fiber semi-finished product 3 is not exactly the same in every repetition of the RTM process, the mold cavity forms gaps 10 between the fiber semi-finished products and the surface 5 of the mold cavity in the overlap receiving section 8.In the overlap receiving section 8, four fixing elements 7, designed as projections 7', are provided to fix the first fiber semi-finished product 2 with two of the projections 7', which extend over the entire width B of the fiber semi-finished product overlap area, and the second fiber semi-finished product 3 with the other two projections 7'. Two of the projections 7' are positioned opposite each other and enclose the first fiber semi-finished product 2 and the second fiber semi-finished product 3 between them. By embedding the projections 7' into the fiber semi-finished products and pressing the fiber semi-finished products together, movement of the first fiber semi-finished product 2 or the second fiber semi-finished product 3 is prevented, at least in the area of ​​the overlap receiving section 8. The resin is guided directly into the relief channel 6 via a resin injection channel 9 (not shown), which is located exactly in the center of the overlap receiving section and is flanked by two projections 7'.The resin spreads in a controlled manner through the projections 7' and the relief channel 6 across the entire width B of the fiber preform overlap area 4. The projections 7' are trapezoidal in cross-section, which facilitates their penetration into the first fiber preform 2 and the second fiber preform 3, respectively. The relief channel 6 is at least partially circular on its side facing away from the fiber preforms, with the walls of the relief channel running at a 90° angle to the surface 5. When the resin is injected through the injection channel 9, it spreads through the relief channel 6 across the entire width B. Simultaneously with its spread towards the relief channel 6, the resin also spreads along the relief channel 6 at a 90° angle to it until its spread is slowed by the projections 7'.This directed resin flow ensures a uniform distribution of the resin in the first fiber semi-finished product 2 and the second fiber semi-finished product 3, since the resin flow is fed from the center of the overlap receiving section and enables complete, uniform impregnation of the fiber semi-finished products with the resin.

[0028] Fig. Figure 2 shows a schematic sectional view through an overlap receiving section 8 of an RTM tool 1. The RTM tool 1 is formed by the first tool half 1' and the second tool half 1" which form the mold cavity between them. The mold cavity serves as the negative form of the fiber composite component to be produced, which is composed of the first fiber semi-finished product 2 and two second fiber semi-finished products 3. The fiber composite component is to be reinforced at the overlap area to withstand forces that would damage a fiber composite component consisting only of the first fiber semi-finished product 2. Since the trimming of the second fiber semi-finished products 3 is not exactly the same in every repetition of the RTM process, the mold cavity forms gaps 10 between the second fiber semi-finished products 3 and the surface 5 of the mold cavity in the overlap receiving section 8.In the overlap receiving section 8, four fixing elements 7, designed as a plurality of projections 7", are arranged to fix a second fiber semi-finished product 3 with two of the plurality of projections 7", which extend over the total width B of the fiber semi-finished product overlap area 4. One projection 7" from each of two opposing plurality of projections 7" faces each other and encloses the first fiber semi-finished product 2 and the two second fiber semi-finished products 3 between them. By embedding the projections 7" into the fiber semi-finished products and pressing the fiber semi-finished products together, movement of the first fiber semi-finished product 2 and the second fiber semi-finished products 3 is prevented, at least in a region of the overlap receiving section 8. The resin is guided directly into the relief channel 6 via a resin injection channel 9 (not shown), which is arranged centrally in the overlap receiving section and flanked by two of the projections 7'.The resin can spread in a controlled manner through the relief channel 6 across the entire width B of the fiber preform overlap area 4. The projections 7" are trapezoidal in cross-section and have a rounded base, which facilitates their insertion into the second fiber preform 3 during fixation. The relief channel 6 is at least partially circular on its side facing away from the fiber preforms, with the walls of the relief channel running at a 90° angle to the surface 5. When the resin is injected through the injection channel 9, it spreads through the relief channel 6 across the entire width B. Simultaneously with its spread towards the relief channel 6, the resin also spreads along the relief channel 6 at a 90° angle to it.This directed resin flow ensures a uniform distribution of the resin in the first fiber semi-finished product 2 and in the second fiber semi-finished product 3, since the resin flow is fed from the center of the overlap receiving section and enables complete uniform impregnation of the fiber semi-finished products with the resin.

[0029] Fig. Figure 3 shows a section similar to the representation in Fig. 2, however, the resin injection channel 9 is also visible, which directs the resin into one of the second fiber semi-finished products 3. The resin initially spreads within the second fiber semi-finished product 3 until it reaches one of the relief channels 6 flanking the resin injection channel 9, which directs the resin across the entire width B of the fiber semi-finished product overlap area. On the surface 5 opposite the resin injection channel 9, a further relief channel 6 is arranged centrally, so that the resin that has penetrated from the resin injection channel 9 through the second fiber semi-finished products 3 and the first fiber semi-finished product 2 is also evenly distributed on the surface opposite the resin injection channel 9.On the surface 5, on which the resin injection channel 9 is also located, a plurality of projections 7" are formed flanking this fixing element 7, with each plurality of projections 7" being opposite a projection 7' ​​on the opposite side of the surface 5, and each projection 7' ​​and plurality of projections 7" clamp the first fiber semi-finished product 2 and the second fiber semi-finished products 3 between them and restrict the movement of the fiber semi-finished products. The movement of the first fiber semi-finished product 2 is additionally restricted by a projection 7' ​​that is arranged directly adjacent to the overlap receiving section 8.Another relief channel 6 is arranged directly adjacent to the overlap receiving section 8 to distribute a resin flow front moving towards the overlap receiving area 8 in the mold cavity over the total width B before it hits one of the columns 10, in order to enable a uniform distribution of the resin without defects.

[0030] Fig.Figure 4 shows a schematic top view of a fiber composite component consisting of a first fiber semi-finished product 2 and two second fiber semi-finished products 3. The first fiber semi-finished product 2 forms a fiber semi-finished product overlap area 4 with each of the second fiber semi-finished products 3. One of the fiber semi-finished product overlap areas 4 extends in a straight line with a total width B along a sloping edge between the first fiber semi-finished product 2 and one of the second fiber semi-finished products 3. The second fiber semi-finished product overlap area 4 extends in a wave-like shape with a total width B along a wave-shaped edge between the first fiber semi-finished product 2 and the other second fiber semi-finished product 3. A relief channel 6 is formed in each of the fiber semi-finished product overlap areas 4, each following the shape of the respective fiber semi-finished product overlap area 4.The relief channel 6 in the fiber semi-finished product overlap area 4 of the inclined edge is flanked by a fixing element 7, which is designed as a projection 7' ​​extending along the relief channel 6 over the entire width B. The second relief channel 6 is flanked on both sides by a plurality of projections 7" that follow the course of the wave-shaped relief channel 6.

[0031] The invention is not limited in its implementation to the preferred embodiments specified above. Rather, a number of variants are conceivable that utilize the illustrated solution even in fundamentally different designs. For example, the relief channel can also be designed as a gap that is open on one side to the environment around the RTM tool.

Claims

[1] Method for producing a fiber composite component in an RTM tool (1) by introducing a matrix into a first and a second fiber semi-finished product (2, 3) which form a common fiber semi-finished product overlap area (4) with a total width B in which the first fiber semi-finished product (2) overlaps at least partially with the second fiber semi-finished product (3), wherein the RTM tool (1) has a mold cavity that forms a cavity in the RTM tool (1) and includes an overlap receiving section (8), a surface (5) of the mold cavity facing the cavity in the overlap receiving section (8) and / or directly adjacent to it a relief channel (6) opening towards the cavity and the surface (5) of the mold cavity facing the cavity in the overlap receiving section (8) forms a fixing means (7) extending into the cavity and wherein the procedure includes at least the following steps: a) Inserting the first fiber semi-finished product (2) into the cavity of the RTM tool (1); b) Inserting the second fiber semi-finished product (3) into the cavity of the RTM tool (1) so that the first fiber semi-finished product (2) forms the common fiber semi-finished product overlap area (4) with the second fiber semi-finished product (3) and this is positioned in the overlap receiving section (8); c) Fixing the first and / or the second fiber semi-finished product (2, 3) at least during injection of the matrix by the fixing means (7) of the RTM tool (1) extending over the total width B of the fiber semi-finished product overlap area (4), wherein the mold cavity forms gaps (10) between the fiber semi-finished products (2, 3) and the surface (5) of the mold cavity in the overlap receiving section (8); d) Injecting the matrix through a matrix injection channel (9) into the mold cavity, so that the matrix spreads in the first fiber semi-finished product (2) and / or the second fiber semi-finished product (3) and spreads in the overlap receiving section (8) and / or directly adjacent to it via the relief channel (6) over the total width B of the fiber semi-finished product overlap area (4). [2] Method according to claim 1, comprising fixing, wherein the first and / or the second fiber semi-finished product (2, 3) is fixed at least during the injection of the matrix by the fixing agent (7) which is formed by a projection (7') extending along the relief channel (6) and projecting into the cavity. [3] Method according to claim 1, comprising fixing, wherein the first and / or the second fiber semi-finished product (2, 3) is fixed at least during the injection of the matrix by the fixing means (7) which is formed by a plurality of projections (7") extending into the cavity and the projections (7") of the plurality of projections (7") are arranged at regular intervals along the relief channel (6). [4] Method according to one of the preceding claims, comprising fixing, wherein the first fiber semi-finished product is fixed at least during injection by the fixing agent (7) and a further fixing agent is located on the surface (5) opposite, by which the second fiber semi-finished product is fixed at least during injection. [5] Method according to any of the preceding claims, comprising: Control of a propagation speed and propagation quantity of the matrix during injection of the matrix through a height of the relief channel (6), wherein the height of the relief channel (6) is greater in a first region of the relief channel (6) than in a second region of the relief channel (6), which is spaced apart from the first region in a propagation direction of the matrix through the relief channel (6). [6] Method according to claim 5, comprising controlling a propagation speed of the matrix and a propagation quantity when injecting the matrix through a width of the relief channel (6), wherein the width of the relief channel (6) is larger in a first region of the relief channel (6) than in a second region of the relief channel (6), which is spaced apart from the first region in a propagation direction of the matrix through the relief channel (6). [7] Method according to one of the preceding claims, wherein when inserting the second fiber semi-finished product (3) the fiber semi-finished product overlap area (4) is arranged in the overlap receiving section (8) formed by a first tool half (1') and a second tool half (1") of the RTM tool (1) which together form at least a part of the mold cavity. [8] Method according to claim 7, wherein in the fixing process the surface (5) on which the fixing means (7) is formed is formed by the first tool half (1'), the second tool half (1") and / or a fiber composite component core of the RTM tool (1) arranged in the cavity. [9] Method according to claim 7 or 8, wherein during injection the surface (5) on which the relief channel (6) is formed, over which the matrix is ​​distributed, is formed on the first tool half (1'), the second tool half (1") and / or a fiber composite component core of the RTM tool (1) arranged in the cavity. [10] Method according to one of the preceding claims, wherein a respective thickness of the first and second fiber semi-finished product (2, 3) in the fiber semi-finished product overlap area (4) is reduced in a thickness direction orthogonal to a respective surface facing the RTM tool (1) from an original thickness to a final thickness, wherein the transition of the thickness from the original thickness to the final thickness is abrupt and / or gradual and wherein the final thickness is smaller than the original thickness.

Images